| a low potential iron-sulfur cluster bound to membranes in blue-green algae. | a new low temperature epr signal at g = 1.92 was found in photoreduced membrane fractions prepared from blue-green algae, nostoc muscorum, tolypothrix tenuis, phormidium persicinum, and anabaena variabilis. the signal also appeared when the sample was chemically reduced in the dark. judging from the spectrum, the signal was probably due to the reduced form of a membrane-bound iron-sulfur cluster, tentatively designated as cluster d. the midpoint potential of cluster d was determined to be -0.27 ... | 1985 | 2987203 |
| cytotoxic, fungicidal nucleosides from blue green algae belonging to the scytonemataceae. | tubercidin, toyocamycin, and the corresponding 5'-alpha-d-glucopyranose derivatives of the nucleosides are frequently responsible for much of the cytotoxicity and antimycotic activity associated with extracts of cultured cyanophytes belonging to the family scytonemataceae. the 5'-alpha-d-glucopyranoses of tubercidin and toyocamycin, for example, are the major cytotoxic and fungicidal nucleosides in fijian plectonema radiosum and hawaiian tolypothrix tenuis, respectively. | 1988 | 3139604 |
| growth of the blue-green alga tolypothrix tenuis as affected by cobalt and molybdenum. | | 1973 | 4205240 |
| effect of herbicides on growth and nitrogen-fixation of alga, tolypothrix tenuis. | | 1970 | 4986828 |
| ultrastructure of blue-green algae. | two freshwater blue-green algae, tolypothrix tenuis and fremyella diplosiphon, and an oscillatorialike marine alga, were found to possess structures on the photosynthetic lamellae which appear to correspond to the phycobilisomes of red algae. these homologous structures are important because they contain the phycobilins which are accessory pigments involved in photosynthesis. as in the red algae, the phycobilisomes were attached on the outer side of each lamellae, i.e., the side facing away from ... | 1969 | 5776533 |
| chemical structure of oligosaccharides in the blue-green alga, tolypothrix tenuis. | | 1965 | 5880202 |
| dark and photometabolism of sugars by a blue green alga: tolypothrix tenuis. | the carbohydrate metabolism of the autotrophically grown blue-green alga, tolypothrix tenuis, was studied. the alga respires glucose, fructose, galactose, and ribose. about 60% of the glucose consumed is converted by starved cells into a glucose polysaccharide. glucose uptake and o(2) consumption are not inhibited by 0.01 m arsenite or by 0.005 m iodoacetamide. the distribution of (14)c in the polysaccharide glucose was established after feeding of glucose-1-(14)c, -2-(14)c, -6-(14)c, ribose-1-( ... | 1966 | 5932406 |
| study of energy transfer in the antenna system isolated from mastigocladus laminosus cohn. | phycobilisomes oriented in stretched polymer films exhibit anisotropy of absorption and fluorescence. up to now it was not clear in which way, by the deformation of their shape or by orientation of undeformed phycobilisome disk, this anisotropy of chromophore absorption and emission is reached. the photographs of two different kind of phycobilisomes obtained from cyanobacteria tolypothrix tenuis and mastigocladus laminosus were taken using a fluorescence microscope. from these photographs follow ... | 1993 | 8250936 |
| kalkipyrone, a toxic gamma-pyrone from an assemblage of the marine cyanobacteria lyngbya majuscula and tolypothrix sp. | kalkipyrone, a novel alpha-methoxy-beta,beta'-dimethyl-gamma-pyrone possessing an alkyl side chain, was isolated from an assemblage of the marine cyanobacteria lyngbyamajuscula and tolypothrix sp. its structure, including stereochemistry, was determined by nmr, uv, and ir analysis and by gc-ms of the natural product and key derivatives. kalkipyrone is toxic to brine shrimp (ld50 1 microg/ml) and gold fish (ld50 2 microg/ml) and is structurally related to the actinopyrones that were previously is ... | 1998 | 9599278 |
| tolyporphins j and k, two further porphinoid metabolites from the cyanobacterium tolypothrix nodosa. | two new porphinoids, tolyporphins j (1) and k (2), have been isolated from the terrestrial cyanobacterium, tolypothrix nodosa (ht-58-2) and identified by nmr and mass spectral analysis. the activities of tolyporphins j and k in cell sensitization and drug accumulation assays for multidrug resistance (mdr) reversal were compared with those of tolyporphin a. unusual nmr spectroscopic shifts were observed for tolyporphin j (1) in cdcl3. | 1998 | 9748382 |
| cyanobacterial transposons tn5469 and tn5541 represent a novel noncomposite transposon family. | a noncomposite transposon, designated tn5541, was isolated from strain fd33 of the filamentous cyanobacterium fremyella diplosiphon utex 481. sequence analysis showed that tn5541 is structurally and genetically very similar to tn5469, which is also endogenous to f. diplosiphon. both tn5469 and tn5541 encode homologous forms of an unusual composite transposase and a protein of unknown function. dna hybridization analysis showed that like tn5469, tn5541 was not widely distributed among cyanobacter ... | 1998 | 9811670 |
| rhodium-catalyzed formylation of organomercurials: application to efficient polyol synthesis. | the rhodium-catalyzed formylation of organomercurials-a new transformation of organomercurials-is reported. the addition of 0.50 equiv of 1,4-diazabicyclo[2.2.2]octane (dabco) was found to promote the reaction, and it is postulated that the dabco acts as a ligand for mercury. several examples are presented to document the scope of the reaction. this reaction was developed in the context of a larger program focused on the development of efficient strategies for the synthesis of polyol-derived nat ... | 2000 | 11009382 |
| is the 16s-23s rrna internal transcribed spacer region a good tool for use in molecular systematics and population genetics? a case study in cyanobacteria. | we amplified, ta-cloned, and sequenced the 16s-23s internal transcribed spacer (its) regions from single isolates of several cyanobacterial species, calothrix parietina, scytonema hyalinum, coelodesmium wrangelii, tolypothrix distorta, and a putative new genus (isolates srs6 and srs70), to investigate the potential of this dna sequence for phylogenetic and population genetic studies. all isolates carried its regions containing the sequences coding for two trna molecules (trna and trna). we retri ... | 2001 | 11371594 |
| two novel cyclic peptides with antifungal activity from the cyanobacterium tolypothrix byssoidea (eawag 195). | two novel cyclic tridecapeptides, tolybyssidins a (1) and b (2), were isolated from the culture medium of mass cultured cyanobacterium tolypothrix byssoidea (eawag 195) by means of bioguided isolation. the gross structures of these peptides were determined by 1d and 2d nmr experiments and tandem mass spectrometry. both peptides contain the nonnatural amino acid dehydrohomoalanine (dhha) as well as proteinogenic amino acids albeit with d- or l-configuration. the compounds exhibit moderate antifun ... | 2001 | 11429991 |
| the ycf27 genes from cyanobacteria and eukaryotic algae: distribution and implications for chloroplast evolution. | the two ycf27 genes from the filamentous cyanobacterium tolypothrix pcc 7601 have been cloned and sequenced. these two genes, previously designated rpaa and rpab, encode putative transcriptional regulators of the 'ompr' family. in synechocystis pcc 6803, homologous genes have been linked to the regulation of transfer of excitation energy from the phycobilisome to photosystem (ps) i and psii respectively. partial clones from spirulina platensis, dactylococcopsis salina and synechococcus pcc 7002 ... | 2002 | 12204368 |
| tolypodiol, an antiinflammatory diterpenoid from the cyanobacterium tolypothrix nodosa. | a new diterpenoid, tolypodiol (1), has been isolated from the terrestrial cyanobacterium tolypothrix nodosa (ht-58-2) and identified by nmr and mass spectral analysis. the monoacetate derivative 2 was prepared. tolypodiol (1) and its monoacetate derivative 2 show potent antiinflammatory activity in the mouse ear edema assay. | 1996 | 8792625 |
| changes in composition of cellular material during formation of phycobilin chromoproteids in a blue-green alga, tolypothrix tenuis. | | 1962 | 13895763 |
| the nblai protein from the filamentous cyanobacterium tolypothrix pcc 7601: regulation of its expression and interactions with phycobilisome components. | cyanobacteria respond to changes in light or nutrient availability by modifications in their photosynthetic light harvesting antenna. in unicellular cyanobacteria a small polypeptide (nbla) is required for phycobilisome degradation following environmental stresses. in the filamentous strain tolypothrix sp. pcc 7601 the nblai gene, encoding a nbla homologue, is located upstream of the operon coding for phycoerythrin (cpeba). the nblai transcripts all originate from a single transcription start po ... | 2003 | 14617160 |
| antimicrobial activities of indolocarbazole and bis-indole protein kinase c inhibitors. | the antimicrobial activities of twenty-two substances structurally related to staurosporine, aglycone in the indolocarbazole and bis-indole series were examined against streptomyces chartreusis and streptomyces griseus, bacillus cereus, escherichia coli, candida albicans and botrytis cinerea. inhibition of sporulation was examined also on the two species of streptomyces. unlike literature reports for efficient protein kinase inhibitors, staurosporine and k-252a, no evident correlation could be f ... | 1994 | 8071125 |
| immunolocalization of nbla, a protein involved in phycobilisome turnover, during heterocyst differentiation in cyanobacteria. | in unicellular non-diazotrophic cyanobacteria, nbla is a small polypeptide required for phycobilisome degradation during macronutrient limitation. in the filamentous n(2)-fixing tolypothrix sp., a nbla gene (nblai) lies upstream of the cpeba operon that encodes phycoerythrin apoproteins. using a specific anti-nblai antibody it was found that in strains of tolypothrix sp. nblai abundance increases under nitrogen-limiting conditions but the protein is also present in cells grown in nitrogen-replet ... | 2004 | 15133099 |
| comparison of light and dark nitrogenase activity in selected soil cyanobacteria. | frequency of heterocytes and nitrogenase activity (na) under light and dark cultivation conditions was determined in 12 cyanobacterial strains isolated from various soil habitats. in spite of a high variability, significant differences in na among the strains were found in response of light and dark cultivation. relatively high na (9.9-15.3 micromol/h c2h4 per g fresh mass) under light conditions and basal na after 12 h of dark cultivation were detected in anabaena, nodularia, tolypothrix, and 1 ... | 2004 | 15530010 |
| hassallidin a, a glycosylated lipopeptide with antifungal activity from the cyanobacterium hassallia sp. | hassallidin a (1), a new antifungal glycosylated lipopeptide, was isolated from an epilithic cyanobacterium collected in bellano, italy, identified as tolypothrix (basionym hassallia) species. chemical, mass spectrometric, and spectroscopic analyses, including one- and two-dimensional nmr, were performed to determine an esterified eight-residue cyclic peptide linked with a carbohydrate and a fatty acid residue. chiral gc-ms analysis revealed the occurrence of the nonproteinogenic amino acids d-a ... | 2005 | 15921412 |
| evidence for the presence of highly phosphorylated nucleotides in the cyanobacterium tolypothrix sp. | | 1982 | 6816633 |
| effect of interactions among algae on nitrogen fixation by blue-green algae (cyanobacteria) in flooded soils. | nitrogen fixation (c(2)h(2) reduction) by algae in flooded soil was limited by interactions within the algal community. nitrogen fixation by either indigenous algae or tolypothrix tenuis was reduced severalfold by a dense suspension of the green alga nephrocytium sp. similarly, interactions between the nitrogen-fixing alga (cyanobacterium) aulosira 68 and natural densities of indigenous algae limited nitrogen-fixing activity in one of two soils examined. this was demonstrated by developing a var ... | 1979 | 16345463 |
| effect of mineral nutrients on cell growth and self-flocculation of tolypothrix tenuis for the production of a biofertilizer. | the influence of mineral nutrients on the growth and self-flocculation of tolypothrix tenuis was studied. the identification of possible limiting nutrients in the culture medium was performed by the biomass elemental composition approach. a factorial experimental design was used in order to estimate the contribution of macronutrients and micronutrients, as well as their interactions. iron was identified to be limiting in the culture medium. the micronutrients influenced mainly cellular growth wi ... | 2007 | 16624555 |
| evaluation of tolypothrix germplasm for phycobiliprotein content. | twenty tolypothrix strains, including 15 strains of t. tenuis, three strains of t. ceylonica and one strain each of t. nodosa and t. bouteillei, were evaluated for their phycobiliprotein content and composition. significant differences among the tolypothrix strains were found at both inter- and intra-specific levels in the production of phycobiliprotein constituents--phycocyanin (pc), allophycocyanin (apc) and phycoerythrin (pe). four specific parameters, viz. pc or pe content, total phycobilipr ... | 2003 | 12744078 |
| the impact of atrazine on lake periphyton communities, including carbon uptake dynamics using track autoradiography. | chlorophyll a, freshweight biomass, ash-free dry weight, cell numbers, species richness, community carbon uptake and species-specific carbon uptake were used to monitor the impact of atrazine (2 chloro-4-ethylamino-6-isopropylamino-s-triazine) on an in situ, enclosed periphyton community. atrazine concentrations ranging from 0.08 to 1.56 mg litre(-1) were used during the 2 years of study. in both 1982 and 1983, there was a shift from a chlorophyte- to a diatom-dominated community. in 1982 the cy ... | 1987 | 15092733 |
| improvement of selective removal of heavy metals in cyanobacteria by naoh treatment. | in the freshwater cyanobacterium, tolypothrix tenuis, treatment with 0.1 m naoh increased its cd-selective adsorption ability in the presence of ca(2+) or mg(2+). the selective adsorption was also achieved by other alkaline treatments. energy-distributed spectroscopy analysis revealed that cd(2+) was found mainly on the surface of non-treated cells, whereas it was distributed throughout the cell after naoh treatment. the alkaline treatment was effective in increasing the selective adsorption abi ... | 2005 | 16233804 |
| constant phycobilisome size in chromatically adapted cells of the cyanobacterium tolypothrix tenuis, and variation in nostoc sp. | phycobilisomes of tolypothrix tenuis, a cyanobacterium capable of complete chromatic adaptation, were studied from cells grown in red and green light, and in darkness. the phycobilisome size remained constant irrespective of the light quality. the hemidiscoidal phycobilisomes had an average diameter of about 52 nanometers and height of about 33 nanometers, by negative staining. the thickness was equivalent to a phycocyanin molecule (about 10 nanometers). the molar ratio of allophycocyanin, relat ... | 1985 | 16664550 |
| effect of pesticides on blue-green algae and nitrogen-fixation. | the effects of the pesticides, amitrol, a derivative of amitrol (viz. 3,5-diamino-1,2,4-triazole), diquat, paraquat, linuron, mcpa, malathion, and monuron, were studied on the nitrogen-fixing algae, anabaena cylindrica, aulosira sp., calothrix elenkenii. chlorogloeae frischii, cylindrospermum muscicola, nostoc sp. from collema tenax, nostoc muscorum tolypothrix tenuis, and westiellopsis sp. in general, two types of response were discernible; an initial period of depression succeeded by an increa ... | 1975 | 808179 |
| regulated expression of glutamyl-trna synthetase is directed by a mobile genetic element in the cyanobacterium tolypothrix sp. pcc 7601. | the genome of tolypothrix sp. pcc 7601 carries two copies of a novel insertion sequence, istosp1. one of the two copies is located upstream of the gene encoding glutamyl-trna synthetase, an enzyme playing a key role in protein and pigment synthesis. the tnpa gene of the is element and gltx were co-transcribed and their expression was transiently upregulated upon retrieval of the ammonium source irrespective of whether nitrate or no nitrogen source were available. the second copy is also transcri ... | 2006 | 16689802 |
| analysis of time-resolved emission spectra of oriented phycobilisomes. | the polarized time-resolved (in ps range) fluorescence spectra of phycobilisomes obtained from cyanobacteria tolypothrix tenuis embedded in poly(vinyl alcohol) films and oriented by film stretching have been analysed. fluorescence spectra were deconvoluted on gaussian components supposing the same positions of components maxima in three sets of time-resolved spectra taken in natural and polarized light. a good fit of the experimental and calculated spectra was obtained when using the following m ... | 1992 | 17014799 |
| three distinct clades of cultured heterocystous cyanobacteria constitute the dominant n2-fixing members of biological soil crusts of the colorado plateau, usa. | the identity of the numerically dominant n(2)-fixing bacteria in biological soil crusts of the colorado plateau region and two outlying areas was determined using multiple approaches, to link the environmental diversity of nifh gene sequences to cultured bacterial isolates from the regions. of the nifh sequence-types detected in soil crusts of the colorado plateau, 89% (421/473) were most closely related to nifh signature sequences from cyanobacteria of the order nostocales. n(2)-fixing cyanobac ... | 2007 | 17381526 |
| strains of the cyanobacterial genera calothrix and rivularia isolated from the baltic sea display cryptic diversity and are distantly related to gloeotrichia and tolypothrix. | strains of the cyanobacterial genus calothrix display pronounced tapering filaments. these cyanobacteria are benthic, have a worldwide distribution and are among the most easily recognizable cyanobacterial genera. however, it is not clear whether cyanobacterial strains assigned to the genus calothrix constitute a natural monophyletic group. we sequenced 16s rrna genes from 42 cyanobacterial cultures and environmental samples belonging to the genus calothrix, and the morphologically similar gener ... | 2007 | 17466025 |
| action spectra for chromatic adaptation in tolypothrix tenuis. | the dark synthesis of biliproteins in the blue-green alga tolypothrix tenuis is controlled by brief light treatments. green light potentiates synthesis of phycoerythrin and red light potentiates synthesis of phycocyanin. red reverses the effect of green and vice versa. action spectra for the red and green effects were obtained for the wavelength region 320 nanometers to 710 nanometers, at 10-nanometer intervals. the principal action band in the red peaks at 660 nanometers, with a half-band width ... | 1973 | 16658334 |
| action spectra for phycobiliprotein synthesis in a chromatically adapting cyanophyte, fremyella diplosiphon. | the action spectra for phycocyanin production by the cyanophyte fremyella diplosiphon shows maxima at 463 and 641 nm. the action spectrum for phycoerythrin production includes maxima at 387 and 550 nm. the maxima are based on a relative response rate well within the linear ascending portion of the dose response curves; the positions of the maxima are independent of the relative response rates chosen for reference over a 3-fold range although the comparative effectiveness of light at pairs of wav ... | 1977 | 16660196 |
| morphological variability in selected heterocystous cyanobacterial strains as a response to varied temperature, light intensity and medium composition. | the effect of temperature, light and nutrient composition on morphological traits was determined in seven nostocacean cyanobacteria (anabaena planctonica, a. sphaerica var. conoidea, a. spiroides, aphanizomenon gracile, nostoc sp., scytonema sp., and tolypothrix sp.). their morphological variability was high but only some of the features showed changes reflecting varied growth conditions. the frequency of heterocyst occurrence decreased with increasing nitrogen concentration. within the range st ... | 2008 | 18759118 |
| effects of acute gamma-irradiation on the aquatic microbial microcosm in comparison with chemicals. | effects of acute gamma-irradiation were investigated in the aquatic microcosm consisting of green algae (chlorella sp. and scenedesmus sp.) and a blue-green alga (tolypothrix sp.) as producers; an oligochaete (aeolosoma hemprichi), rotifers (lecane sp. and philodina sp.) and a ciliate protozoan (cyclidium glaucoma) as consumers; and more than four species of bacteria as decomposers. at 100 gy, populations were not affected in any taxa. at 500-5000 gy, one or three taxa died out and populations o ... | 2009 | 19604608 |
| a non-hydrolyzable atp derivative generates a stable complex in a light-inducible two-component system. | isothermal calorimetry (itc) measurements yielded the binding constants during complex formation of light-inducible histidine kinases (hk) and their cognate chey-type response regulators (rr). hk-rr interactions represent the core function of the bacterial two-component system, which is also present in many bacterial phytochromes. here, we have studied the recombinant forms of phytochromes cpha and cphb from the cyanobacterium tolypothrix pcc7601 and their cognate rrs rcpa and rcpb. the interact ... | 2009 | 19808667 |
| enzyme activities of the carbon reduction cycle in some photosynthetic organisms. | profile analyses of the enzymes comprising the photosynthetic carbon reduction cycle have been performed in extracts of dark grown and greening euglena gracilis var. bacillaris. chlorella pyrenoidosa grown photoautotrophically, in the light with glucose or in the dark with glucose, tolypothrix tenuis, chromatium and leaves of spinach. amounts of activity are compared with the level of photosynthetic co(2) fixation. only in chromatium were all enzyme activities sufficient to support the in vivo r ... | 1969 | 16657059 |
| biological dinitrogen fixation by selected soil cyanobacteria as affected by strain origin, morphotype, and light conditions. | the potential for n(2) fixation by heterocystous cyanobacteria isolated from soils of different geographical areas was determined as nitrogenase activity (na) using the acetylene reduction assay. morphology of cyanobacteria had the largest influence on na determined under light conditions. na was generally higher in species lacking thick slime sheaths. the highest value (1446 nmol/h c(2)h(4) per g fresh biomass) was found in the strain of branched cyanobacterium hassalia (a has1) from the polar ... | 2010 | 20941582 |
| phylogenetic and molecular clock inferences of cyanobacterial strains within rivulariaceae from distant environments. | heterocyst-forming cyanobacteria are important players at both evolutionary and ecological scales, but to date it has been difficult to establish their phylogenetic affiliations. we present data from a phylogenetic and molecular clock analysis of heterocystous cyanobacteria within the family rivulariaceae, including the genera calothrix, rivularia, gloeotrichia and tolypothrix. the strains were isolated from distant geographic regions including fresh and brackish water bodies, microbial mats fro ... | 2011 | 21208268 |
| sulfate-driven elemental sparing is regulated at the transcriptional and posttranscriptional levels in a filamentous cyanobacterium. | sulfur is an essential nutrient that can exist at growth-limiting concentrations in freshwater environments. the freshwater cyanobacterium fremyella diplosiphon (also known as tolypothrix sp. pcc 7601) is capable of remodeling the composition of its light-harvesting antennae, or phycobilisomes, in response to changes in the sulfur levels in its environment. depletion of sulfur causes these cells to cease the accumulation of two forms of a major phycobilisome protein called phycocyanin and initia ... | 2011 | 21239582 |
| laser desorption ionisation-time of flight mass spectrometry of the tolyporphins, bioactive metabolites from the cyanobacterium tolypothrix nodosa. | the tolyporphins are metabolites isolated from the cyanobacterium tolypothrix nodosa, comprising a porphyrin-like macrocycle with c-glycoside, hydroxide or acetate substituents. previous studies of porphyrins by maldi/ldi-tof ms indicate that strong radical cations and anions are usually observed in the parent spectra with little fragmentation of the macrocycle. the spectra of the tolyporphins were obtained and trends in the series utilised to partially characterise two new analogues. | 2011 | 21312309 |
| phenotypic variability and phylogenetic relationships of tolypothrix and calothrix (nostocales, cyanobacteria) from running water. | the taxonomy of heterocystous cyanobacteria belonging to the genera calothrix and tolypothrix has long been a matter of debate, but their phylogenetic relationships are still not well understood. our aim was to compare the phylogeny and morphology of members of these genera, which exhibit basal-apical polarity. a phylogeny was reconstructed on the basis of 16s rrna gene sequences and compared with the morphological characterisation of new isolates and environmental samples. strains isolated from ... | 2011 | 21317280 |
| a comparative study on effective cell disruption methods for lipid extraction from microalgae. | aims: to compare effective cell disruption methods for lipid extraction from fresh water microalgae. method and results: chlorella sp., nostoc sp., and tolypothrix sp. were isolated from fresh water ponds in and around gandhigram, dindigul district, tamilnadu, india and used for lipid extraction. different methods, including autoclaving, bead-beating, microwave, sonication and a 10% nacl solution treatments were tested to identify the most effective cell disruption method. the total lipids fro ... | 2011 | 21575021 |
| Cyanobacteria-mediated phenylpropanoids and phytohormones in rice (Oryza sativa) enhance plant growth and stress tolerance. | Phenylpropanoids, flavonoids and plant growth regulators in rice (Oryza sativa) variety (UPR 1823) inoculated with different cyanobacterial strains namely Anabaena oryzae, Anabaena doliolum, Phormidium fragile, Calothrix geitonos, Hapalosiphon intricatus, Aulosira fertilissima, Tolypothrix tenuis, Oscillatoria acuta and Plectonema boryanum were quantified using HPLC in pot conditions after 15 and 30-ádays. Qualitative analysis of the induced compounds using reverse phase HPLC and further confirm ... | 2011 | 21732035 |
| toxopsis calypsus gen. nov., sp. nov. (cyanobacteria, nostocales) from cave 'francthi', peloponnese, greece - morphological and molecular evaluation. | one new cyanobacterial genus toxopsis lamprinou & pantazidou gen. nov. was found in fresh material of cave 'francthi'(peloponnese, greece) and isolated in cultures; additionally, ecological data of the sampling sites are provided concerning the environmental parameters [photosynthetically active radiation (par), temperature (t), relative humidity (rh)]. morphological characters and the life cycle of the type species toxopsis calypsus lamprinou & pantazidou sp. nov. were studied under lm, sem and ... | 2012 | 22247210 |
| comparative analysis of cyanobacteria in the rhizosphere and as endosymbionts of cycads in drought-effected soils. | does the diversity of cyanobacteria in the cycad rhizosphere relate to the cyanobiont species found in the coralloid roots of these ancient plants? the aim of this study was to identify the diversity of soil cyanobacteria occurring in the immediate vicinity of 22 colonised coralloid roots belonging to members of the cycad genera: macrozamia, lepidozamia, bowenia and cycas. the majority of coralloid roots were sampled at depths greater than 10 cm below the soil surface. a total of 32 cyanobacteri ... | 2012 | 22224502 |
| treatment of mixed domestic-industrial wastewater using cyanobacteria. | alexandria sanitary drainage company (asdco), alexandria, egypt has two primary treatment plants, the eastern and the western wastewater treatment plants (ewtp and wwtp) that receive mixed domestic-industrial influents and discharge into l. mariut. the lake is subjected therefore to severe levels of pollution and dominated by members of cyanobacteria that can cope with the high pollution load in the lake water. isolation and utilization of the locally generated cyanobacterial biomass for remedia ... | 2008 | 18726623 |
| effects of acute gamma-irradiation on community structure of the aquatic microbial microcosm. | to characterise indirect effects of ionising radiation on aquatic microbial communities, effects of acute gamma-irradiation were investigated in a microcosm consisting of populations of green algae (chlorella sp. and scenedesmus sp.) and a blue-green alga (tolypothrix sp.) as producer; a ciliate protozoan (cyclidium glaucoma), rotifers (lecane sp. and philodina sp.) and an oligochaete (aeolosoma hemprichi) as consumer; and more than four species of bacteria as decomposers. population changes in ... | 2010 | 20615589 |
| photoreversible pigment: occurrence in a blue-green alga. | a new photoreversible pigment has been isolated from the blue-green alga tolypothrix tenuis. this pigment bears certain resemblances to phytochrome, except that absorption maxima for the two forms are in the green and red portions of the spectrum instead of the red and far-red. the pigment may control diverse differentiative processes in blue-green algae. | 1972 | 17778430 |