Publications
| Title | Abstract | Year Filter | PMID(sorted ascending) Filter |
|---|
| [characterization of recombinant l-isoleucine-4-hydroxylase from bacillus thuringiensis and its application in 4hydroxyisoleucine biosynthesis]. | l-isoleucine-4-hydroxylase (ido) encoding gene ido from bacillus thuringiensis tccc 11826 was cloned and expressed, followed by enzyme characterization. in addition, recombinant strain was tested for its 4-hydroxyisoleucine (4-hil) biotransformation. | 2014 | 25345020 |
| metagenomic analysis of the airborne environment in urban spaces. | the organisms in aerosol microenvironments, especially densely populated urban areas, are relevant to maintenance of public health and detection of potential epidemic or biothreat agents. to examine aerosolized microorganisms in this environment, we performed sequencing on the material from an urban aerosol surveillance program. whole metagenome sequencing was applied to dna extracted from air filters obtained during periods from each of the four seasons. the composition of bacteria, plants, fun ... | 2014 | 25351142 |
| biological activities of xylooligosaccharides generated from garlic straw xylan by purified xylanase from bacillus mojavensis ueb-fk. | a newly isolated bacterium strain named ueb-fk was selected from tunisian sahara, exhibiting the highest clear zone on agar plates containing oat spelt xylan by staining with congo red. on the basis of 16s rdna sequence analysis, this strain was identified as bacillus mojavensis. this strain produced extracellular xylanase. xylanase from the strain was purified to homogeneity and had an apparent molecular weight of 14 kda. the k m and v max values of the purified xylanase on oat spelt xylan were ... | 2015 | 25351626 |
| different effects of paternal trans-generational immune priming on survival and immunity in step and genetic offspring. | paternal trans-generational immune priming, whereby fathers provide immune protection to offspring, has been demonstrated in the red flour beetle tribolium castaneum exposed to the insect pathogen bacillus thuringiensis. it is currently unclear how such protection is transferred, as in contrast to mothers, fathers do not directly provide offspring with a large amount of substances. in addition to sperm, male flour beetles transfer seminal fluids in a spermatophore to females during copulation. d ... | 2014 | 25355479 |
| densovirus is a mutualistic symbiont of a global crop pest (helicoverpa armigera) and protects against a baculovirus and bt biopesticide. | mutualistic associations between symbiotic bacteria and their hosts are common within insect systems. however, viruses are often considered as pathogens even though some have been reported to be beneficial to their hosts. herein, we report a novel densovirus, helicoverpa armigera densovirus-1 (hadnv-1) that appears to be beneficial to its host. hadnv-1 was found to be widespread in wild populations of h. armigera adults (>67% prevalence between 2008 and 2012). in wild larval populations, there w ... | 2014 | 25357125 |
| characterization of regulatory regions involved in the inducible expression of chib in bacillus thuringiensis. | expression of the chib gene from bacillus thuringiensis bti75 was defined as inducible by the use of transcriptional fusions with the bgab reporter gene. the transcription start site of the chib gene was identified as the c base located 132 base pairs upstream of the start codon. analysis of 5' and 3' deletions of the chib promoter region revealed that the sequence from position -192 to +36 with respect to the transcription start site was necessary for wild-type levels of inducible expression of ... | 2015 | 25362505 |
| a 90-day subchronic feeding study of genetically modified rice expressing cry1ab protein in sprague-dawley rats. | bacillus thuringiensis (bt) transgenic rice line (mfb-mh86) expressing a synthetic cry1ab gene can be protected against feeding damage from lepidopteran insects, including sesamia inferens, chilo suppressalis, tryporyza incertulas and cnaphalocrocis medinalis. rice flour from mfb-mh86 and its near-isogenic control mh86 was separately formulated into rodent diets at concentrations of 17.5, 35 and 70 % (w/w) for a 90-day feeding test with rats, and all of the diets were nutritionally balanced. in ... | 2015 | 25367203 |
| efficient generation of marker-free transgenic rice plants using an improved transposon-mediated transgene reintegration strategy. | marker-free transgenic plants can be developed through transposon-mediated transgene reintegration, which allows intact transgene insertion with defined boundaries and requires only a few primary transformants. in this study, we improved the selection strategy and validated that the maize (zea mays) activator/dissociation (ds) transposable element can be routinely used to generate marker-free transgenic plants. a ds-based gene of interest was linked to green fluorescent protein in transfer dna ( ... | 2015 | 25371551 |
| phytochemical investigation and anti-microbial activity of clausena anisata (willd), hook. | clausena anisata belongs to the family rutaceae, a shrub widely used in west africa for the treatment of bacterial and fungal infections of the skin including boils, ringworm and eczema. the study was designed to evaluate the antimicrobial activity and phytochemical screening of ethanol leaf extract of c. anisata (cle). | 2014 | 25371583 |
| acute, sublethal, and combination effects of azadirachtin and bacillus thuringiensis on the cotton bollworm, helicoverpa armigera. | the cotton bollworm, helicoverpa armigera hübner (lepidoptera: noctuidae) is a polyphagous and cosmopolitan insect pest that causes damage to various plants. in this study, the lethal and sublethal effects of azadirachtin and bacillus thuringiensis berliner sub sp . kurstaki (bacillales: bacillaceae) were evaluated on third instar h. armigera under laboratory conditions. the lc50 values of azadirachtin and bt were 12.95 and 96.8 µg a.i./ml, respectively. a total mortality of 56.7% was caused on ... | 2014 | 25373177 |
| developing a targeting system for bacterial membranes: measuring receptor-phosphatidylglycerol interactions with (1)h nmr, itc and fluorescence correlation spectroscopy. | an ammonium picket porphyrin that targets bacterial membranes has been prepared and shown to bind to phosphatidylglycerol (pg), a bacterial lipid, when the lipid was in solution, contained within synthetic membrane vesicles, or when in gram-negative and gram-positive bacterial membranes. the multifunctional receptor was designed to interact with both the phosphate anion portion and neutral glycerol portion of the lipid headgroup. the receptor's affinity and selectivity for binding to surfactant ... | 2015 | 25373409 |
| emira: ecologic malaria reduction for africa--innovative tools for integrated malaria control. | malaria control is based on early treatment of cases and on vector control. the current measures for malaria vector control in africa are mainly based on long-lasting insecticide treated nets (llins) and to a much smaller extent on indoor residual spraying (irs). a third pillar in the fight against the malaria vector, larval source management (lsm), has virtually not been used in africa since the ban of ddt in the 1960s. within the light of recent who recommendations for bacillus thuringiensis i ... | 2014 | 25377345 |
| response surface methodology: optimisation of antifungal bioemulsifier from novel bacillus thuringiensis. | an antifungal bioemulsifier compound was produced from a novel strain of bacillus thuringiensis pak2310. to accentuate the production and as the first step to improve the yield, a central composite design (ccd) was used to study the effect of various factors like minimal salts (1x and 3x), glycerol concentration (2% and 4%), beef extract concentration (1% and 3%), and sunflower oil concentration (2% and 4%) on the production of bioemulsifier molecule and to optimize the conditions to increase th ... | 2014 | 25379529 |
| melanin: a photoprotection for bacillus thuringiensis based biopesticides. | melanins are negatively-charged, hydrophobic, dark high molecular weight irregular biopolymers, composed of polymerized phenolic and/or indolic compounds. they are produced by most organisms. bacillus thuringiensis is a gram-positive, spore-forming, soil bacterium and the most successful biological control agent that produces distinctly shaped crystals during sporulation that have insecticidal activity. however, one of the main disadvantages is that the insecticidal activity of b. thuringiensis ... | 2015 | 25381045 |
| molecular and insecticidal characterization of a novel cry-related protein from bacillus thuringiensis toxic against myzus persicae. | this study describes the insecticidal activity of a novel bacillus thuringiensis cry-related protein with a deduced 799 amino acid sequence (~89 kda) and ~19% pairwise identity to the 95-kda-aphidicidal protein (sequence number 204) from patent us 8318900 and ~40% pairwise identity to the cancer cell killing cry proteins (parasporins cry41ab1 and cry41aa1), respectively. this novel cry-related protein contained the five conserved amino acid blocks and the three conserved domains commonly found i ... | 2014 | 25384108 |
| structural and biophysical characterization of bacillus thuringiensis insecticidal proteins cry34ab1 and cry35ab1. | bacillus thuringiensis strains are well known for the production of insecticidal proteins upon sporulation and these proteins are deposited in parasporal crystalline inclusions. the majority of these insect-specific toxins exhibit three domains in the mature toxin sequence. however, other cry toxins are structurally and evolutionarily unrelated to this three-domain family and little is known of their three dimensional structures, limiting our understanding of their mechanisms of action and our a ... | 2014 | 25390338 |
| cry1f resistance in fall armyworm spodoptera frugiperda: single gene versus pyramided bt maize. | evolution of insect resistance to transgenic crops containing bacillus thuringiensis (bt) genes is a serious threat to the sustainability of this technology. however, field resistance related to the reduced efficacy of bt maize has not been documented in any lepidopteran pest in the mainland u.s. after 18 years of intensive bt maize planting. here we report compelling evidence of field resistance in the fall armyworm, spodoptera frugiperda (j.e. smith), to cry1f maize (tc 3507) in the southeaste ... | 2014 | 25401494 |
| a challenge for the seed mixture refuge strategy in bt maize: impact of cross-pollination on an ear-feeding pest, corn earworm. | to counter the threat of insect resistance, bacillus thuringiensis (bt) maize growers in the u.s. are required to plant structured non-bt maize refuges. concerns with refuge compliance led to the introduction of seed mixtures, also called rib (refuge-in-the-bag), as an alternative approach for implementing refuge for bt maize products in the u.s. maize belt. a major concern in rib is cross-pollination of maize hybrids that can cause bt proteins to be present in refuge maize kernels and negativel ... | 2014 | 25409442 |
| biphasic fermentation is an efficient strategy for the overproduction of δ-endotoxin from bacillus thuringiensis. | this study illustrates a biphasic solid-state fermentation (ssf) strategy for the overproduction of δ-endotoxin from bacillus thuringiensis subsp. kurstaki (btk) and also purification of δ-endotoxin from the solid-fermented medium. the fermentation strategy had two phases (biphasic); i.e., the first short phase was semisolid state (12 h), and the remaining long phase was strict ssf. to achieve the biphasic ssf, after 12 h (150 rpm, 37 °c) fermentation of the medium [luria-bertani (lb) supplement ... | 2015 | 25410805 |
| expression of recombinant and mosaic cry1ac receptors from helicoverpa armigera and their influences on the cytotoxicity of activated cry1ac to spodoptera litura sl-hp cells. | bacillus thuringiensis (bt) toxin receptors play important roles in the killing of pests, and investigation on characterization of the receptors is essential for utilization of bt and management of insect resistance. here, recombinant and mosaic receptors of bt cry1ac toxin from helicoverpa armigera were expressed in spodoptera litura sl-hp cells and their influences on cytotoxicity of activated cry1ac toxin were investigated. when h. armigera aminopeptidase n1 (apn1), alkaline phosphatase 2 (al ... | 2016 | 25412589 |
| pen and pal are nucleotide-sugar dehydratases that convert udp-glcnac to udp-6-deoxy-d-glcnac-5,6-ene and then to udp-4-keto-6-deoxy-l-altnac for cmp-pseudaminic acid synthesis in bacillus thuringiensis. | cmp-pseudaminic acid is a precursor required for the o-glycosylation of flagellin in some pathogenic gram-negative bacteria, a process known to be critical in bacterial motility and infection. however, little is known about flagellin glycosylation in gram-positive bacteria. here, we identified and functionally characterized an operon, named bti_pse, in bacillus thuringiensis israelensis atcc 35646, which encodes seven different enzymes that together convert udp-glcnac to cmp-pseudaminic acid. in ... | 2014 | 25414257 |
| cis-mediated down-regulation of a trypsin gene associated with bt resistance in cotton bollworm. | transgenic plants producing insecticidal proteins from the bacterium bacillus thuringiensis (bt) are useful for pest control, but their efficacy is reduced when pests evolve resistance. here we examined the mechanism of resistance to bt toxin cry1ac in the laboratory-selected lf5 strain of the cotton bollworm, helicoverpa armigera. this strain had 110-fold resistance to cry1ac protoxin and 39-fold resistance to cry1ac activated toxin. evaluation of five trypsin genes revealed 99% reduced transcr ... | 2014 | 25427690 |
| toxicity, activation process, and histopathological effect of bacillus thuringiensis vegetative insecticidal protein vip3aa16 on tuta absoluta. | tuta absoluta is a destructive moth of solanaceae plants and especially tomatoes. here, we considered the entomopathogenic activity of the bacillus thuringiensis vip3aa16 protein heterologously produced by escherichia coli against t. absoluta. purified vip3aa16 showed lower lethal concentration 50 % against third instar larvae (toxin/tomato leaf) (335 ± 17 ng/cm(2)) compared to that of b. thuringiensis kurstaki hd1 δ-endotoxins (955 ± 4 ng/cm(2)) (p < 0.05). action mode examination showed that v ... | 2015 | 25432339 |
| characterisation of novel bacillus thuringiensis isolates against aedes aegypti (diptera: culicidae) and ceratitis capitata (diptera: tephridae). | bacillus thuringiensis is successfully used in pest management strategies as an eco-friendly bioinsecticide. isolation and identification of new strains with a wide variety of target pests is an ever growing field. in this paper, new b. thuringiensis isolates were investigated to search for original strains active against diptera and able to produce novel toxins that could be used as an alternative for the commercial h14 strain. biochemical and molecular characterization revealed a remarkable di ... | 2015 | 25433312 |
| [influence of different adhesive composition on sporulation and protein synthesis by bacillus thuringiensis collection strains]. | the influence of different sticky-gene composition on sporulation and protein synthesis by b. thuringiensis collection strains has been investigated. it has been detemined that the most effective according this characteristics were b. thuringiensis collection strains 0293 and 98. it has been shown that the best on protein synthesis processes and sporulation by investigated b. thuringiensis strains influences adding to the culture medium sticky-gene compositions a and e in a concentration of from ... | 2014 | 25434213 |
| the cultivation of bt corn producing cry1ac toxins does not adversely affect non-target arthropods. | transgenic corn producing cry1ac toxins from bacillus thuringiensis (bt) provides effective control of asian corn borer, ostrinia furnacalis (guenée), and thus reduces insecticide applications. however, whether bt corn exerts undesirable effects on non-target arthropods (ntas) is still controversial. we conducted a 2-yr study in shangzhuang agricultural experiment station to assess the potential impact of bt corn on field population density, biodiversity, community composition and structure of n ... | 2014 | 25437213 |
| quantitative proteome analysis of caenorhabditis elegans upon exposure to nematicidal bacillus thuringiensis. | caenorhabditis elegans can be infected by a plethora of pathogens, most of them are also pathogenic for humans. consequently, the nematode has emerged as a powerful surrogate host to model microbial human infectious diseases in a non-vertebrate, for the study of innate immunity and host-pathogen interactions. signaling cascades are well investigated that face bacterial or fungal pathogens. we analyzed the downstream processes of these cascades, i.e. the differential expression of effector and re ... | 2015 | 25452134 |
| lipopeptide biosurfactant from bacillus thuringiensis pak2310: a potential antagonist against fusarium oxysporum. | the aims of the study were to evaluate the effects of a biosurfactant obtained from a novel bacillus thuringiensis on fusarium oxysporum to determine the morphological changes in the structure of the fungi and its biofilm in the presence of the biosurfactant and to evaluate the toxicity of the biosurfactant on hep-2 human epithelial cell lines. | 2015 | 25456418 |
| toxicity of bacillus thuringiensis var. israelensis in aqueous suspension on the south american common frog leptodactylus latrans (anura: leptodactylidae) tadpoles. | the effects of commercial formulations of bacillus thuringiensisvar.israelensis (bti) on non-target organisms are still a matter of debate; in amphibians, the risks of bti are little known. to evaluate the toxicity of a commercial liquid (aqueous suspension, as) formulation of bti (introban(®)) on leptodactylus latrans tadpoles, including median lethal concentration (lc50) and no-and lowest-observed-effect concentrations (noec and loec, respectively), as well as the possible effects of bti on ox ... | 2015 | 25460638 |
| contribution of arbuscular mycorrhizal fungi and/or bacteria to enhancing plant drought tolerance under natural soil conditions: effectiveness of autochthonous or allochthonous strains. | autochthonous microorganisms [a consortium of arbuscular-mycorrhizal (am) fungi and bacillus thuringiensis (bt)] were assayed and compared to rhizophagus intraradices (ri), bacillus megaterium (bm) or pseudomonas putida (psp) and non-inoculation on trifolium repens in a natural arid soil under drought conditions. the autochthonous bacteria bt and the allochthonous bacteria psp increased nutrients and the relative water content and decreased stomatal conductance, electrolyte leakage, proline and ... | 2015 | 25462971 |
| chelation, spectroscopic characterization, biological activity and crystal structure of 2,3-butanedione isonicotinylhydrazone: determination of zr(4+) after flotation separation. | new metal complexes of co(ii), ni(ii) cu(ii), zn(ii), cd(ii), pd(ii) and hg(ii) with 2,3-butanedione isonicotinylhydrazone [binh] have been prepared and investigated. single crystal for binh is grown and solved as orthorhombic with p 21 21 2 space group. the formula of the ligand was assigned based on the elemental analysis, mass spectra and conductivity measurements. the complexes assigned the formulae [m(binh-h)cl]⋅nh2o (mco(ii), ni(ii), cu(ii), zn(ii); n=0 or 1); [hg(binh-h)(h2o)2cl]; [cd(bin ... | 2015 | 25467677 |
| uniform orientation of biotinylated nanobody as an affinity binder for detection of bacillus thuringiensis (bt) cry1ac toxin. | nanobodies are the smallest natural fragments with useful properties such as high affinity, distinct paratope and high stability, which make them an ideal tool for detecting target antigens. in this study, we generated and characterized nanobodies against the cry1ac toxin and applied them in a biotin-streptavidin based double antibodies (nanobodies) sandwich-elisa (das-elisa) assay. after immunizing a camel with soluble cry1ac toxin, a phage displayed library was constructed to generate nbs agai ... | 2014 | 25474492 |
| identification of single nucleotide polymorphisms (snps) in the 16s rrna gene of foodborne bacillus spp. | the main goal of this work was the identification of single nucleotide polymorphisms (snps) in the 16s rrna gene of foodborne bacillus spp. that may be useful for typing purposes. these species include, among others, bacillus cereus, an important pathogenic species involved in food poisoning, and bacillus licheniformis, bacillus subtilis and bacillus pumilus, which are causative agents of food spoilage described as responsible for foodborne disease outbreaks. with this purpose in mind, 52 bacill ... | 2015 | 25475292 |
| detection of toxin proteins from bacillus thuringiensis strain 4.0718 by strategy of 2d-lc-ms/ms. | bacillus thuringiensis is a kind of insecticidal microorganism which can produce a variety of toxin proteins, it is particularly important to find an effective strategy to identify novel toxin proteins rapidly and comprehensively with the discovery of the wild-type strains. multi-dimensional high-performance liquid chromatography combined with mass spectrometry has become one of the main methods to detect and identify toxin proteins and proteome of b. thuringiensis. in this study, protein sample ... | 2015 | 25477065 |
| heterologous expression, purification and biochemical characterization of endochitinase chia74 from bacillus thuringiensis. | chia74 is a secreted endochitinase produced by bacillus thuringiensis. previously we have partially characterized the physical parameters that affect enzymatic activity of chia74 in crude preparations of bacterial secretomes. in the present study, we cloned the chia74 open reading frame (orf) lacking the 5' sequence coding for its secretion signal peptide (chia74δsp) into a cold shock expression vector (pcoldi) for production of the enzyme in escherichia coli bl21-rosetta 2. as a result, the n-t ... | 2015 | 25478931 |
| resistance of trichoplusia ni populations selected by bacillus thuringiensis sprays to cotton plants expressing pyramided bacillus thuringiensis toxins cry1ac and cry2ab. | two populations of trichoplusia ni that had developed resistance to bacillus thuringiensis sprays (bt sprays) in commercial greenhouse vegetable production were tested for resistance to bt cotton (bollgard ii) plants expressing pyramided cry1ac and cry2ab. the t. ni colonies resistant to bacillus thuringiensis serovar kurstaki formulations were not only resistant to the bt toxin cry1ac, as previously reported, but also had a high frequency of cry2ab-resistant alleles, exhibiting ca. 20% survival ... | 2015 | 25480752 |
| apolipophorin iii from honeybees (apis cerana) exhibits antibacterial activity. | apolipophorin iii (apolp-iii) is involved in lipid transport and innate immunity in insects. in this study, an apolp-iii protein that exhibits antibacterial activity was identified in honeybees (apis cerana). a. cerana apolp-iii cdna encodes a 193 amino acid sequence that shares high identity with other members of the hymenopteran insect apolp-iii family. a. cerana apolp-iii is expressed constitutively in the fat body, epidermis, and venom gland and is detected as a 23-kda protein. a. cerana apo ... | 2015 | 25483322 |
| highly toxic and broad-spectrum insecticidal local bacillus strains engineered using protoplast fusion. | protoplast fusion was performed between a local bacillus thuringiensis uv-resistant mutant 66/1a (bt) and bacillus sphaericus ghai (bs) to produce new bacillus strains with a wider spectrum of action against different insects. bt is characterized as sensitive to polymyxin and streptomycin and resistant to rifampicin and has shown 87% mortality against spodoptera littoralis larvae at concentration of 1.5 × 10(7) cells/ml after 7 days of feeding; bs is characterized as resistant to polymyxin and s ... | 2015 | 25485592 |
| production of polyclonal and monoclonal antibodies against the bacillus thuringiensis vegetative insecticidal protein vip3aa16. | the aim of this study is to establish a quantitative determination of the vegetative insecticidal protein vip3a from the culture supernatant of bacillus thuringiensis either by elisa or by the conventional quantification method of the western blot band. the vip3a protein was produced by fermentation of the b. thuringiensis reference strain bupm95 in 3 l. by western blot, the vip3aa16 toxin was detected in the culture supernatant during the exponential growth phase of b. thuringiensis bupm95. how ... | 2015 | 25492687 |
| the protoxin cry1ac of bacillus thuringiensis improves the protection conferred by intranasal immunization with brucella abortus rb51 in a mouse model. | brucellosis is a zoonotic disease affecting many people and animals worldwide. preventing this infection requires improving vaccination strategies. the protoxin cry1ac of bacillus thuringiensis is an adjuvant that, in addition to increasing the immunogenicity of different antigens, has shown to be protective in different models of parasitic infections. the objective of the present study was to test whether the intranasal co-administration of pcry1ac with the rb51 vaccine strain of brucella abort ... | 2015 | 25497237 |
| large-scale test of the natural refuge strategy for delaying insect resistance to transgenic bt crops. | the 'natural refuge strategy" for delaying insect resistance to transgenic cotton that produces insecticidal proteins from bacillus thuringiensis (bt) relies on refuges of host plants other than cotton that do not make bt toxins. we tested this widely adopted strategy by comparing predictions from modeling with data from a four-year field study of cotton bollworm (helicoverpa armigera) resistance to transgenic cotton producing bt toxin cry1ac in six provinces of northern china. bioassay data rev ... | 2015 | 25503384 |
| [influence of different sticky-gene composition on sporulation and protein synthesis by bacillus thuringiensis collection strains]. | the influence of different sticky-gene composition on sporulation and protein synthesis by b. thuringiensis collection strains has been investigated. it has been detemined that the most effective according this characteristics were b. thuringiensis collection strains 0293 and 98. it has been shown that the best on protein synthesis processes and sporulation by investigated b. thuringiensis strains influences adding to the culture medium sticky-gene compositions a and e in a concentration of from ... | 2014 | 25507811 |
| bacillus thuringiensis toxins: an overview of their biocidal activity. | bacillus thuringiensis (bt) is a gram positive, spore-forming bacterium that synthesizes parasporal crystalline inclusions containing cry and cyt proteins, some of which are toxic against a wide range of insect orders, nematodes and human-cancer cells. these toxins have been successfully used as bioinsecticides against caterpillars, beetles, and flies, including mosquitoes and blackflies. bt also synthesizes insecticidal proteins during the vegetative growth phase, which are subsequently secrete ... | 2014 | 25514092 |
| quantifying transient interactions between bacillus phosphatidylinositol-specific phospholipase-c and phosphatidylcholine-rich vesicles. | bacillus thuringiensis secretes the virulence factor phosphatidylinositol-specific phospholipase c (btpi-plc), which specifically binds to phosphatidylcholine (pc) and cleaves gpi-anchored proteins off eukaryotic plasma membranes. to elucidate how btpi-plc searches for gpi-anchored proteins on the membrane surface, we measured residence times of single fluorescently labeled proteins on pc-rich small unilamellar vesicles (suvs). btpi-plc interactions with the suv surface are transient with a life ... | 2015 | 25517221 |
| analysis of resistance to cry1ac in field-collected pink bollworm, pectinophora gossypiella (lepidoptera:gelechiidae), populations. | high survivorship of pink bollworrm, pectinophora gossypiella in bolls of bollgard® cotton hybrids and resistance to cry1ac protein, expressed in bollgard cotton were reported in field-populations collected from the state of gujarat (western india) in 2010. we have found cry1ac-resistance in pink bollworm populations sourced from bollgard and non-bt cotton fields in the adjoining states of maharashtra and madhya pradesh in central india. further, we observed reduced binding of labeled cry1ac pro ... | 2014 | 25523173 |
| activation of gab cluster transcription in bacillus thuringiensis by γ-aminobutyric acid or succinic semialdehyde is mediated by the sigma 54-dependent transcriptional activator gabr. | bacillus thuringiensis gabr is a sigma 54-dependent transcriptional activator containing three typical domains, an n-terminal regulatory domain per-arnt-sim (pas), a central aaa(+) (atpases associated with different cellular activities) domain and a c-terminal helix-turn-helix (hth) dna binding domain. gabr positively regulates the expression of the gabt gene of the gab gene cluster, which is responsible for the γ-aminobutyric acid (gaba) shunt. | 2014 | 25527261 |
| identification of micrornas by small rna deep sequencing for synthetic microrna mimics to control spodoptera exigua. | beet armyworm, spodoptera exigua, is a major pest of cotton around the world. with the increase of resistance to bacillus thuringiensis (bt) toxin in transgenic cotton plants, there is a need to develop an alternative control approach that can be used in combination with bt transgenic crops as part of resistance management strategies. micrornas (mirnas), a non-coding small rna family (18-25 nt), play crucial roles in various biological processes and over-expression of mirnas has been shown to in ... | 2015 | 25528266 |
| efficacy of an alphabaculovirus-based biological insecticide for control of chrysodeixis chalcites (lepidoptera: noctuidae) on tomato and banana crops. | chrysodeixis chalcites (esper) is a major pest of tomato in mediterranean countries and attacks banana in the canary islands (spain). the efficacy of chrysodeixis chalcites single nucleopolyhedrovirus (chchsnpv-tf1) was evaluated in plant growth chambers and greenhouse trials performed on tomato and banana plants respectively. treatments were applied using a compressed air sprayer. | 2015 | 25534715 |
| chemical and biological insecticides select distinct gene expression patterns in aedes aegypti mosquito. | worldwide evolution of mosquito resistance to chemical insecticides represents a major challenge for public health, and the future of vector control largely relies on the development of biological insecticides that can be used in combination with chemicals (integrated management), with the expectation that populations already resistant to chemicals will not become readily resistant to biological insecticides. however, little is known about the metabolic pathways affected by selection with chemic ... | 0 | 25540155 |
| aquatic degradation of cry1ab protein and decomposition dynamics of transgenic corn leaves under controlled conditions. | the increasing cultivation of genetically modified corn plants (zea mays) during the last decades is suggested as a potential risk to the environment. one of these genetically modified variety expressed the insecticidal cry1ab protein originating from bacillus thuringiensis (bt), resulting in resistance against ostrinia nubilalis, the european corn borer. transgenic litter material is extensively studied regarding the decomposition in soils. however, only a few field studies analyzed the fate of ... | 2015 | 25553417 |
| complete genome sequence of bacillus thuringiensis serovar galleriae strain hd-29, a typical strain of commercial biopesticide. | bacillus thuringiensis serovar galleriae is highly toxic to lepidoptera insect pests, and has been widely used as bt biopesticide in many countries. here we reported the complete genome of strain hd-29, a standard serotype strain in galleriae serovariety. more than previous work reported, it harbors ten plasmids, and three large ones carry eight insecticidal protein genes (cry1aa, cry1ac, cry1ca, cry1da, cry1ia, cry2ab, cry9ea and vip3aa) and an intact zwittermicin a biosynthetic gene cluster. | 2015 | 25556027 |
| the diverse nematicidal properties and biocontrol efficacy of bacillus thuringiensis cry6a against the root-knot nematode meloidogyne hapla. | cry6a toxin from bacillus thuringiensis is a representative nematicidal crystal protein with a variety of nematicidal properties to free-living nematode caenorhabditis elegans. cry6a shares very low homology and different structure with cry5b, another representative nematicidal crystal protein, and probably acts in a distinct pathway. all these strongly indicate that cry6a toxin is likely a potent candidate for nematicide. the present study dealt with global investigation to determine the detrim ... | 2015 | 25556591 |
| cry1ab protein from bacillus thuringiensis and mon810 cry1ab-transgenic maize exerts no adjuvant effect after airway exposure. | the genetically modified (gm) maize event mon810 has been inserted with a processed version of the transgene, cry1ab, derived from the soil bacterium bacillus thuringiensis (bt) to express proteins with insecticidal properties. such proteins may introduce new allergens and also act as adjuvants that promote allergic responses. while focus has been on safe consumption and hence the oral exposure to gm food and feed, little is known regarding inhalation of pollen and desiccated airborne plant mate ... | 2015 | 25564738 |
| inheritance, fitness costs, incomplete resistance and feeding preferences in a laboratory-selected mon810-resistant strain of the true armyworm mythimna unipuncta. | the low efficacy of mon810 maize against mythimna unipuncta represents a scenario of non-compliance with the 'high-dose' strategy, raising concerns about potential resistance development and outbreaks of this secondary pest. the present study offers insight into the different components related to resistance in a laboratory-selected mon810-resistant (mr) strain of m. unipuncta. | 2015 | 25565147 |
| genetic markers for western corn rootworm resistance to bt toxin. | western corn rootworm (wcr) is a major maize (zea mays l.) pest leading to annual economic losses of more than 1 billion dollars in the united states. transgenic maize expressing insecticidal toxins derived from the bacterium bacillus thuringiensis (bt) are widely used for the management of wcr. however, cultivation of bt-expressing maize places intense selection pressure on pest populations to evolve resistance. instances of resistance to bt toxins have been reported in wcr. developing genetic ... | 2015 | 25566794 |
| consumption of bt rice pollen containing cry1c or cry2a does not pose a risk to propylea japonica (thunberg) (coleoptera: coccinellidae). | as a pollen feeder, propylea japonica would be directly exposed to cry proteins in bacillus thuringiensis (bt)-transgenic rice fields. the effect of cry1c- or cry2a-containing transgenic rice pollen on the fitness of p. japonica was assessed using two dietary-exposure experiments in the laboratory. in the first experiment, larval developmental time of p. japonica was significantly longer when fed pollen from bt rice lines rather than control pollen but other life table parameters were not signif ... | 2015 | 25567127 |
| evolutionary ecology of insect adaptation to bt crops. | transgenic crops producing bacillus thuringiensis (bt) toxins are used worldwide to control major pests of corn and cotton. development of strategies to delay the evolution of pest resistance to bt crops requires an understanding of factors affecting responses to natural selection, which include variation in survival on bt crops, heritability of resistance, and fitness advantages associated with resistance mutations. the two main strategies adopted for delaying resistance are the refuge and pyra ... | 2010 | 25567947 |
| adaptive management of pest resistance by helicoverpa species (noctuidae) in australia to the cry2ab bt toxin in bollgard ii® cotton. | in australia, monitoring helicoverpa species for resistance to the cry2ab toxin in second generation bacillus thuringiensis (bt) cotton has precisely fulfilled its intended function: to warn of increases in resistance frequencies that may lead to field failures of the technology. prior to the widespread adoption of two-gene bt cotton, the frequency of cry2ab resistance alleles was at least 0.001 in h. armigera and h. punctigera. in the 5 years hence, there has been a significant and apparently e ... | 2010 | 25567948 |
| assessing the role of non-cotton refuges in delaying helicoverpa armigera resistance to bt cotton in west africa. | non-cotton host plants without bacillus thuringiensis (bt) toxins can provide refuges that delay resistance to bt cotton in polyphagous insect pests. it has proven difficult, however, to determine the effective contribution of such refuges and their role in delaying resistance evolution. here, we used biogeochemical markers to quantify movement of helicoverpa armigera moths from non-cotton hosts to cotton fields in three agricultural landscapes of the west african cotton belt (cameroon) where bt ... | 2012 | 25568029 |
| cross-resistance and interactions between bt toxins cry1ac and cry2ab against the cotton bollworm. | to delay evolution of pest resistance to transgenic crops producing insecticidal proteins from bacillus thuringiensis (bt), the "pyramid" strategy uses plants that produce two or more toxins that kill the same pest. we conducted laboratory diet experiments with the cotton bollworm, helicoverpa armigera, to evaluate cross-resistance and interactions between two toxins in pyramided bt cotton (cry1ac and cry2ab). selection with cry1ac for 125 generations produced 1000-fold resistance to cry1ac and ... | 2015 | 25586723 |
| design, synthesis and biological evaluation of metronidazole-thiazole derivatives as antibacterial inhibitors. | a series of metronidazole–thiazole derivatives has been designed, synthesized and evaluated as potential antibacterial inhibitors. all the synthesized compounds were determined by elemental analysis, (1)h nmr and ms. they were also tested for antibacterial activity against escherichia coli, bacillus thuringiensis, bacillus subtilis and pseudomonas aeruginosa as well as for the inhibition to fabh. the results showed that compound 5 e exhibited the most potent inhibitory activity against e. coli f ... | 2014 | 25587588 |
| the midgut cadherin-like gene is not associated with resistance to bacillus thuringiensis toxin cry1ac in plutella xylostella (l.). | the gram-positive bacterium bacillus thuringiensis (bt) produces cry toxins that have been used to control important agricultural pests. evolution of resistance in target pests threatens the effectiveness of these toxins when used either in sprayed biopesticides or in bt transgenic crops. although alterations of the midgut cadherin-like receptor can lead to bt cry toxin resistance in many insects, whether the cadherin gene is involved in cry1ac resistance of plutella xylostella (l.) remains uncl ... | 2015 | 25595643 |
| optimizing pyramided transgenic bt crops for sustainable pest management. | transgenic crop pyramids producing two or more bacillus thuringiensis (bt) toxins that kill the same insect pest have been widely used to delay evolution of pest resistance. to assess the potential of pyramids to achieve this goal, we analyze data from 38 studies that report effects of ten bt toxins used in transgenic crops against 15 insect pests. we find that compared with optimal low levels of insect survival, survival on currently used pyramids is often higher for both susceptible insects an ... | 2015 | 25599179 |
| down-regulation of a novel abc transporter gene (pxwhite) is associated with cry1ac resistance in the diamondback moth, plutella xylostella (l.). | biopesticides or transgenic crops based on cry toxins from the soil bacterium bacillus thuringiensis (bt) effectively control agricultural insect pests. the sustainable use of bt biopesticides and bt crops is threatened, however, by the development of cry resistance in the target pests. the diamondback moth, plutella xylostella (l.), is the first pest that developed resistance to a bt biopesticide in the field, and a recent study has shown that the resistance of p. xylostella to cry1ac is caused ... | 2015 | 25636859 |
| [influence of coordination compounds of germanium (iv) and stannum (iv) on activity of some microbial enzymes with glycolytic and proteolytic action]. | influence of coordinative compounds of germanium (iv) and stanum (iv) (complexes of germanium (iv) with nicotinamide (nad) [gecl2(nad)4]cl2 (1) and complexes of stanum (iv) with 2-hydroxybenzoilhydrazone 4-dimetylaminobenzaldehide (2-oh-hbdb) [sncl4(2-oh-bdb-h)] (2), 3-hydroxy-2-naphtoilhydrazone 2-hydroxynaphtaldehide (3-oh-h2lnf) [sncl3(3-oh-hlnf)] (3) and izonicotinoilhydrazone 2-hydroxyibenzaldehide [sncl3 (is·h)] (4) on activity of peptidases 1 and 2 bacillus thuringiensis, α-l-rhamnosidase ... | 2015 | 25639038 |
| evaluation of alternative plutella xylostella control by two isaria fumosorosea conidial formulations - oil-based formulation and wettable powder - combined with bacillus thuringiensis. | entomopathogenic fungi are potential candidates for controlling the diamondback moth plutella xylostella (l.) (lepidoptera: plutellidae). the control efficacy of two isaria fumosorosea conidial formulations - wettable powder and oil-based formulation - combined with bacillus thuringiensis against p. xylostella was tested. | 2015 | 25641869 |
| effects of refuges on the evolution of resistance to transgenic corn by the western corn rootworm, diabrotica virgifera virgifera leconte. | diabrotica virgifera virgifera leconte is a major pest of corn and causes over a billion dollars of economic loss annually through yield reductions and management costs. corn producing toxins derived from bacillus thuringiensis (bt) has been developed to help manage d. v. virgifera. however, previous studies have demonstrated the ability of this species to evolve resistance to bt toxins in both laboratory and field settings. | 2016 | 25652190 |
| rotary-based platform with disposable fluidic modules for automated isolation of nucleic acids. | we describe the development and evaluation of a rotary-based platform with multiple disposable fluidic modules for simultaneous automatic nucleic acid (na) isolation from up to 24 biological samples. the procedure is performed inside insulated individual disposable modules, which minimizes both the risk of infection of personnel and laboratory cross-contamination. each module is a segment of a circular cylinder containing a leak-proof inlet port for sample input, reservoirs with lyophilized chem ... | 2015 | 25653066 |
| the expression and crystallization of cry65aa require two c-termini, revealing a novel evolutionary strategy of bacillus thuringiensis cry proteins. | the insecticidal crystal protein (cry) genes of bacillus thuringiensis are a key gene resource for generating transgenic crops with pest resistance. however, many cry genes cannot be expressed or form crystals in mother cells. here, we report a novel cry protein gene, cry65aa1, which exists in an operon that contains a downstream gene encoding a hypothetical protein orf2. we demonstrated that orf2 is required for cry65aa1 expression and crystallization by function as a c-terminal crystallization ... | 2015 | 25656389 |
| pathogenicity and characterization of a novel bacillus cereus sensu lato isolate toxic to the mediterranean fruit fly ceratitis capitata wied. | the lethal and sub-lethal effects of sporulated cultures of a novel bacillus cereus sensu lato strain lacking detectable cry genes and identified through morphological and genetic analyses, have been studied on the mediterranean fruit fly ceratitis capitata. the lethal effects on young larvae were concentration dependent, with a median lethal concentration (lc50) of 4.48 × 10(8)spores/g of diet. sporulated cultures of this strain significantly extended development time and reduced immature survi ... | 2015 | 25659732 |
| endogenous expression of a bt toxin receptor in the cry1ac-susceptible insect cell line and its synergistic effect with cadherin on cytotoxicity of activated cry1ac. | although many insect cell lines derived from various tissues are available, it is unclear whether endogenous receptors of bacillus thuringiensis (bt) crystal toxins are expressed in these cell lines. in the present study, we demonstrated that the ovaries-derived spodoptera litura sl-hp cell line was susceptible to activated cry1ac although larvae of s. litura are not susceptible to the toxin. assays of the transcriptome revealed that thirteen atp-binding cassette transporter genes (abc) were exp ... | 2015 | 25662100 |
| evaluation of biostimulation and tween 80 addition for the bioremediation of long-term ddt-contaminated soil. | the bioremediation of a long-term contaminated soil through biostimulation and surfactant addition was evaluated. the concentrations of 1,1,1-trichloro-2,2-bis(4-chlorophenyl) ethane (ddt) and its metabolites 1,1-dichloro-2,2-bis(4-chlorophenyl) ethane (ddd) and 1,1-dichloro-2,2-bis(4-chlorophenyl) ethylene (dde) were monitored during an 8-week remediation process. physicochemical characterization of the treated soil was performed before and after the bioremediation process. the isolation and id ... | 2015 | 25662244 |
| establishment and characterization of a novel cell line from midgut tissue of helicoverpa armigera (lepidoptera: noctuidae). | the midgut of lepidopteran larvae serves as a target for many pathogens such as bacillus thuringiensis (bt). cell lines originating from midgut tissues will be very helpful tools in many research fields. however, to date, no bt-susceptible midgut-derived cell lines are available. here, we reported that a novel cell line, designated as hnu-ha-mg1, was established from midgut tissue of the fourth instar larvae of helicoverpa armigera. this cell line grew well in grace's insect cell culture medium ... | 2015 | 25678461 |
| molecular docking and site-directed mutagenesis of a bacillus thuringiensis chitinase to improve chitinolytic, synergistic lepidopteran-larvicidal and nematicidal activities. | bacterial chitinases are useful in the biocontrol of agriculturally important pests and fungal pathogens. however, the utility of naturally occurring bacterial chitinases is often limited by their low enzyme activity. in this study, we constructed mutants of a bacillus thuringiensis chitinase with enhanced activity based on homology modeling, molecular docking, and the site-directed mutagenesis of target residues to modify spatial positions, steric hindrances, or hydrophilicity/hydrophobicity. w ... | 2015 | 25678849 |
| lack of fitness costs and inheritance of resistance to bacillus thuringiensis cry1ac toxin in a near-isogenic strain of plutella xylostella (lepidoptera: plutellidae). | resistance to bacillus thuringiensis (bt) formulations in insects may be associated with fitness costs. a lack of costs enables resistance alleles to persist, which may contribute to the rapid development and spread of resistance in populations. | 2016 | 25684167 |
| tribolium castaneum immune defense genes are differentially expressed in response to bacillus thuringiensis toxins sharing common receptor molecules and exhibiting disparate toxicity. | in tribolium castaneum larvae we have demonstrated by rna interference knockdown that the bacillus thuringiensis cry3ba toxin receptors cadherin-like and sodium solute symporter proteins are also functional receptors of the less active cry3aa toxin. differences in susceptibility to b. thuringiensis infection might not only rely on toxin-receptor interaction but also on host defense mechanisms. we compared the expression of the immune related genes encoding apolipophorin-iii and two antimicrobial ... | 2015 | 25684675 |
| dark fermentative bioconversion of glycerol to hydrogen by bacillus thuringiensis. | biodiesel manufacturing units discharge effluents rich in glycerol. the need is to convert crude glycerol (cg) into useful products such as hydrogen (h2). under batch culture, bacillusthuringiensis egu45 adapted on pure glycerol (pg, 2% v/v) resulted in an h2 yield of 0.646 mol/mol glycerol consumed on minimal media (250 ml) supplemented with 1% ammonium nitrate at 37°c over 4 days. here, h2 constituted 67% of the total biogas. under continuous culture, at 2 days of hydraulic retention time, b. ... | 2015 | 25686722 |
| functional assembly of 260-kda oligomers required for mosquito-larvicidal activity of the bacillus thuringiensis cry4ba toxin. | oligomerization has been shown to contribute to the toxicity of bacillus thuringiensis cry toxins. mutations have been made in the cry4ba toxin and resulted in toxic to non-toxic mutants toward aedes aegypti larvae. in this study, cry4ba wild type and mutants were analyzed for oligomer formation in vitro, biochemical properties and their relationships with larvicidal activity. in vitro, the cry4ba forms two-main types of the oligomers including (1) the 260-kda and larger oligomers, which assembl ... | 2015 | 25687547 |
| identification of bacillus thuringiensis cry3aa toxin domain ii loop 1 as the binding site of tenebrio molitor cadherin repeat cr12. | bacillus thuringiensis cry toxins exert their toxic effect by specific recognition of larval midgut proteins leading to oligomerization of the toxin, membrane insertion and pore formation. the exposed domain ii loop regions of cry toxins have been shown to be involved in receptor binding. insect cadherins have shown to be functionally involved in toxin binding facilitating toxin oligomerization. here, we isolated a vhh (vhha5) antibody by phage display that binds cry3aa loop 1 and competed with ... | 2015 | 25698611 |
| maintenance of residual activity of bt toxin by using natural and synthetic dyes: a novel approach for sustainable mosquito vector control. | mosquito control protein from bacillus thuringiensis gets inactivated with exposure to sunlight. to address this issue, the potential of synthetic and natural dye was investigated as sunlight protectants. bt sv2 in absence of dyes when exposed to sunlight showed reduced effectiveness against the fourth instars of mosquito larvae. whereas acriflavin, congo red and violacein were able to maintain 86.4%, 91.6% and 82.2% mosquito larvicidal efficacy of bt sv2 against ivth instars larvae of anopheles ... | 2015 | 25699646 |
| the distribution pattern of dna and protoxin in bacillus thuringiensis as revealed by laser confocal microscopy analysis. | it was reported that the parasporal crystal from bacillus thuringiensis contained dna fragments. to investigate the distribution of protoxin and dna in b. thuringiensis cells at different growth stages, a cry1ac-gfp fusion gene was constructed and expressed in an acrystalliferous b. thuringiensis strain, in which the localization of dna and protoxin were indicated by dna-specific dye and green fluorescent protein, respectively. when the recombinant cells were at the vegetative growth stage, the ... | 2015 | 25715783 |
| spore prevalence and toxigenicity of bacillus cereus and bacillus thuringiensis isolates from u.s. retail spices. | recent incidents of foodborne illness associated with spices as the vehicle of transmission prompted this examination of u.s. retail spices with regard to bacillus cereus. this study focused on the levels of aerobic-mesophilic spore-forming bacteria and b cereus spores associated with 247 retail spices purchased from five states in the united states. samples contained a wide range of aerobic-mesophilic bacterial spore counts (< 200 to 8.3 × 10(7) cfu/g), with 19.1% of samples at levels above 10( ... | 2015 | 25719886 |
| overlapping and unique signatures in the proteomic and transcriptomic responses of the nematode caenorhabditis elegans toward pathogenic bacillus thuringiensis. | pathogen infection can activate multiple signaling cascades that ultimately alter the abundance of molecules in cells. this change can be measured both at the transcript and protein level. studies analyzing the immune response at both levels are, however, rare. here, we compare transcriptome and proteome data generated after infection of the nematode and model organism caenorhabditis elegans with the gram-positive pathogen bacillus thuringiensis. our analysis revealed a high overlap between abun ... | 2015 | 25720978 |
| enhancement of bacillus thuringiensis insecticidal activity by combining cry1ac and bi-functional toxin hwtx-xi from spider. | in order to assess the potency of bi-functional hwtx-xi toxin from spider ornithoctonus huwena in improving the insecticidal activity of bacillus thuringiensis, a fusion gene of cry1ac and hwtx-xi was constructed and expressed in an acrystalliferous b. thuringiensis strain cry(-)b. western blot analysis and microscopic observation revealed that the recombinant strain could express 140-kda cry1ac-hwtx-xi fusion protein and produce parasporal inclusions during sporulation. bioassay using the larva ... | 2016 | 25721170 |
| high resistance of transgenic cabbage plants with a synthetic cry1ia8 gene from bacillus thuringiensis against two lepidopteran species under field conditions. | plutella xylostella (linnaeus) has become the most destructive pest in cabbage throughout the world. cry1ia8 cabbage has been developed to reduce pest attacks. to gain a better understanding of the efficacy of cry1ia8 cabbage, a homozygous cry1ia8 cabbage line a14-5 was produced, and its resistance to p. xylostella, pieris rapae (linnaeus) and other lepidopteran pests was evaluated in the field in 2011, 2012 and 2013. | 2016 | 25721816 |
| distinguishing the dominant species of pathogen in maxillary sinusitis by sequencing dna dataset analysis. | this study determined the microbial composition in maxillary sinusitis and determined the predominant fungal and bacterial species. samples were obtained from 11 patients with fungal sinusitis and 2 healthy patients. the 13 samples were sequenced using an illumina hi-seq 2000, and mapping to the human, bacterial, and the fungal genomes were based on several steps. bioinformatics and statistical analyses were then performed for bacterial and fungal expressions in the samples. all samples were cul ... | 2015 | 25724392 |
| 4-hydroxyisoleucine production of recombinant corynebacterium glutamicum ssp. lactofermentum under optimal corn steep liquor limitation. | 4-hydroxyisoleucine (4-hil) is a nonproteinogenic amino acid that exhibits insulinotropic biological activity. here, l-isoleucine dioxygenase gene (ido) derived from bacillus thuringiensis ybt-1520 was cloned and expressed in an l-isoleucine-producing strain, corynebacterium glutamicum ssp. lactofermentum sn01, in order to directly convert its endogenous l-isoleucine (ile) into 4-hil through single-step fermentation. the effects of corn steep liquor limitation as well as ido and truncated idoδ6 ... | 2015 | 25725632 |
| effects of bacillus thuringiensis israelensis and spinosad on adult emergence of the non-biting midges polypedilum nubifer (skuse) and tanytarsus curticornis kieffer (diptera: chironomidae) in coastal wetlands. | to optimize their efficacy, some insecticides used for mosquito control are introduced into aquatic ecosystems where mosquito larvae develop (marshes, ponds, sanitation devices) and cannot escape from the treated water. however, this raises the question of possible effects of mosquito larvicides on non-target aquatic species. bacillus thuringiensis var. israelensis (bti), which is well-known for its selectivity for nematocera dipterans, is widely used for mosquito control all over the world. spi ... | 2015 | 25728359 |
| binding analysis of bacillus thuringiensis cry1 proteins in the sugarcane borer, diatraea saccharalis (lepidoptera: crambidae). | sugarcane borer (diatraea saccharalis, f.) is an important corn pest in south america and united states. the aim of the present study was to analyze the susceptibility and binding interactions of three cry1a proteins and cry1fa in a brazilian d. saccharalis population. the results showed that cry1ab was the most active, followed by cry1ac, cry1fa and cry1aa. all cry1-biotinylated proteins tested bound specifically to the d. saccharalis brush border membrane vesicles (bbmv). heterologous competit ... | 2015 | 25736726 |
| new cyt-like δ-endotoxins from dickeya dadantii: structure and aphicidal activity. | in the track of new biopesticides, four genes namely cyta, cytb, cytc and cytd encoding proteins homologous to bacillus thuringiensis (bt) cyt toxins have been identified in the plant pathogenic bacteria dickeya dadantii genome. here we show that three cyt-like δ-endotoxins from d. dadantii (cyta, cytb and cytc) are toxic to the pathogen of the pea aphid acyrthosiphon pisum in terms of both mortality and growth rate. the phylogenetic analysis of the comprehensive set of cyt toxins available in g ... | 2015 | 25740111 |
| pathway and kinetics of cyhalothrin biodegradation by bacillus thuringiensis strain zs-19. | cyhalothrin is a common environmental pollutant which poses increased risks to non-target organisms including human beings. this study reported for the first time a newly isolated strain, bacillus thuringiensis zs-19 completely degraded cyhalothrin in minimal medium within 72 h. the bacterium transformed cyhalothrin by cleavage of both the ester linkage and diaryl bond to yield six intermediate products. moreover, a novel degradation pathway of cyhalothrin in strain zs-19 was proposed on the bas ... | 2015 | 25740758 |
| bacillus halodurans strain c125 encodes and synthesizes enzymes from both known pathways to form dump directly from cytosine deoxyribonucleotides. | analysis of the genome of bacillus halodurans strain c125 indicated that two pathways leading from a cytosine deoxyribonucleotide to dump, used for dtmp synthesis, were encoded by the genome of the bacterium. the genes that were responsible, the comeb gene and the dcdb gene, encoding dcmp deaminase and the bifunctional dctp deaminase:dutpase (dcd:dut), respectively, were both shown to be expressed in b. halodurans, and both genes were subject to repression by the nucleosides thymidine and deoxyc ... | 2015 | 25746996 |
| cadherin is involved in the action of bacillus thuringiensis toxins cry1ac and cry2aa in the beet armyworm, spodoptera exigua. | bacillus thuringiensis (bt) insecticidal crystal (cry) proteins are effective against some insect pests in sprays and transgenic crops, although the evolution of resistance could threaten the long-term efficacy of such bt use. one strategy to delay resistance to bt crops is to "pyramid" two or more bt proteins that bind to distinct receptor proteins within the insect midgut. the most common bt pyramid in cotton (gossypium hirsutum l.) employs cry1ac with cry2ab to target several key lepidopteran ... | 2015 | 25754522 |
| chitosan/dsirna nanoparticle targeting identifies agcad1 cadherin in anopheles gambiae larvae as an in vivo receptor of cry11ba toxin of bacillus thuringiensis subsp. jegathesan. | the cry11ba protein of bacillus thuringiensis subsp. jegathesan crystals has uniquely high toxicity against a spectrum of mosquito species. the high potency of cry11ba against anopheles gambiae is caused by recognition of multiple midgut proteins including glycosyl phosphatidylinositol-anchored alkaline phosphatase agalp1, aminopeptidase agapn2, α-amylase agamy1 and α-glucosidase agm3 that bind cry11ba with high affinity and function as putative receptors. the cadherin agcad2 in an. gambiae larv ... | 2015 | 25758367 |
| pxo16 from bacillus thuringiensis serovar israelensis: almost 350 kb of terra incognita. | bacillus thuringiensis strains usually harbor large sets of plasmids, some of which carrying the entomopathogenic δ-endotoxins. b. thuringiensis serovar israelensis, active on dipteran larvae, carries the very large conjugative plasmid pxo16 (350 kb). pxo16 displays a macroscopic aggregation phenotype when liquid cultures of conjugative partners are mixed. its conjugative apparatus is able of transferring itself and other non-conjugative and non-mobilizable plasmids in a fast and very efficient ... | 2015 | 25770691 |
| isolation and distribution of mosquito-larvicidal cry genes in bacillus thuringiensis strains native to saudi arabia. | a total of 157 environmental samples were collected from 11 ecological regions across saudi arabia to isolate native bacillus thuringiensis (bt) strains. bt isolates (n=103) were recovered by the 50% (v/v) ethanol treatment method with bt index range of 0.01 to 0.4. most of bt isolates showed spherical crystals (54%), while, irregular, bi-pyramidal, and spore-attached crystal constituted 27, 16 and 3% respectively. pcr analysis with eight general and specific dipteran primers of cry and cyt gene ... | 2014 | 25776587 |
| comparative analysis of genomics and proteomics in bacillus thuringiensis 4.0718. | bacillus thuringiensis is a widely used biopesticide that produced various insecticidal active substances during its life cycle. separation and purification of numerous insecticide active substances have been difficult because of the relatively short half-life of such substances. on the other hand, substances can be synthetized at different times during development, so samples at different stages have to be studied, further complicating the analysis. a dual genomic and proteomic approach would e ... | 2015 | 25781161 |
| potential of plant growth promoting traits by bacteria isolated from heavy metal contaminated soils. | rhizobacteria can enhance biomass production and heavy metal tolerance of plants under the stress environment. the aim of this study was to collect soil samples from different industrial sites followed by their heavy metal analysis. after performing the icp-aes analysis of soil samples from seven different sites, bacterial strains were isolated from the soil samples of most polluted (heavy metal) site. phylogenetic analysis of isolates based on 16s rdna sequences showed that the isolates belonge ... | 2015 | 25782590 |
| bacterial melanin promotes recovery after sciatic nerve injury in rats. | bacterial melanin, obtained from the mutant strain of bacillus thuringiensis, has been shown to promote recovery after central nervous system injury. it is hypothesized, in this study, that bacterial melanin can promote structural and functional recovery after peripheral nerve injury. rats subjected to sciatic nerve transection were intramuscularly administered bacterial melanin. the sciatic nerve transected rats that did not receive intramuscular administration of bacterial melanin served as co ... | 2015 | 25788932 |
| fitness costs of cry1f resistance in two populations of fall armyworm, spodoptera frugiperda (j.e. smith), collected from puerto rico and florida. | the development of resistance in target pest populations is a threat to the sustainability of transgenic crops expressing bacillus thuringiensis (bt) proteins. fall armyworm, spodoptera frugiperda (j.e. smith), is a major target pest of bt maize in north and south america. this insect is the first target pest that has developed field resistance to bt maize at multiple locations in these regions. the objective of this study was to assess the fitness costs associated with the cry1f resistance in t ... | 2015 | 25791021 |