Publications

[ultrastructure of yersinia pseudotuberculosis in the process of their reversible transition into the dormant (non-culturable) state in association with blue-green algae].	the ultrastructural organization of y. pseudotuberculosis in the process of the transition of vegetative cells into the dormant (noncultivable) state in interaction with blue-green algae of the species anabaena variabilis was studied by the method of transmission electron microscopy. the use of type specific y. pseudotuberculosis serum made it possible to identify y. pseudotuberculosis cells in the bacterial association and to find out whether their antigenic properties remained intact in time. ...	2002	11949247
factors influencing the abundance of japanese encephalitis vectors in ricefields in india--ii. biotic.	the relationship of insect predators and phytoplankton with the abundance of culex tritaeniorhynchus giles, cx. vishnui theobald and cx. pseudovishnui colless mosquito larvae and pupae (diptera: culicidae) in ricefields was investigated during three rice growing seasons. notonectids were the most abundant insect predators, whereas diatoms dominated among phytoplankton. multiple regression analysis showed that the occurrence of notonectids (both nymphs and adults) was negatively associated with l ...	2002	11963972
geographic information system based manure application plan.	a geographic information system (gis) based manure application plan has been developed for the site-specific application of animal waste to agricultural fields in the westbrook sub-catchment of the murray-darling basin, south-east queensland, australia. sites suitable for animal waste application were identified using a gis based weighted linear combination (wlc) model. the degree of land suitability for animal waste application was determined using a range of social, economic, environmental, an ...	2002	11995243
integration of aquatic fate and ecological responses to linear alkyl benzene sulfonate (las) in model stream ecosystems.	an integrated model stream ecosystem fate and effect study of dodecyl linear alkylbenzene sulfonate (c(12)las) was performed in the summer and fall of 1996. the study addressed responses of periphytic microbes, immature benthic fauna including abundance, drift, and emergence of adult insects in a 56-day exposure. exposures ranged from 126 to 2978 microg/l and were continuously presented in a single-pass, flow-through test system. microbial heterotrophs acclimated to c(12)las exposure quickly (14 ...	2002	12061833
free and total amino acid composition in blue-green algae.	a simple, accurate and reproducible analytical method is described for the extraction and the simultaneous determination of 18 amino acids in different for geographical origin spirulina alga samples using phenylisothiocianate as derivatizating agent in natural feed. the best experimental hydrolysis conditions have been studied varying the temperature, the time and the hydrolyzing reagent. the separation and the quantitative analysis of the by-products have been carried out by hplc analysis and u ...	2002	12073880
structures of the complexes of a potent anti-hiv protein cyanovirin-n and high mannose oligosaccharides.	the development of anti-human immunodeficiency virus (hiv) microbicides for either topical or ex vivo use is of considerable interest, mainly due to the difficulties in creating a vaccine that would be active against multiple clades of hiv. cyanovirin-n (cv-n), an 11-kda protein from the cyanobacterium (blue-green algae) nostoc ellipsosporum with potent virucidal activity, was identified in the search for such antiviral agents. the binding of cv-n to the heavily glycosylated hiv envelope protein ...	2002	12110688
experimental substantiation of the possibility of developing selenium- and iodine-containing pharmaceuticals based on blue-green algae spirulina platensis.	the great potential of using blue-green algae spirulina platensis as a matrix for the production of selenium- and iodine-containing pharmaceuticals is shown experimentally. the background levels of 31 major, minor and trace elements (na, mg, al, cl, k, ca, sc, v, cr, mn, fe, co, ni (using (n,p) reaction), as, br, zn, rb, mo, ag, sb, i, ba, sm, tb, tm, hf, ta, w, au, hg, th) in s. platensis biomass were determined by means of epithermal neutron activation analysis. the dependence of selenium and ...	2002	12151068
effects of enteric bacterial and cyanobacterial lipopolysaccharides, and of microcystin-lr, on glutathione s-transferase activities in zebra fish (danio rerio).	cyanobacteria (blue-green algae) can produce a variety of toxins including hepatotoxins e.g. microcystins, and endotoxins such as lipopolysaccharides (lps). the combined effects of such toxins on fish are little known. this study examines the activities of microsomal (m) and soluble (s) glutathione s-transferases (gst) from embryos of the zebra fish, danio rerio at the prim six embryo stage, which had been exposed since fertilisation to lps from different sources. a further aim was to see how ac ...	2002	12200087
kinetics and uptake mechanisms for monomethylmercury between freshwater algae and water.	uptake kinetics of monomethylmercury chloride (mehgcl) were measured for two species of green algae (selenastrum capricomutum and cosmarium botrytis), one blue-green algae (schizothrix calcicola), and one diatom (thalassiosira weissflogii), algal species that are commonly found in natural surface waters. species differences were found with the two green algae giving the highest uptake rates, and one of them (cosmarium) showing differences between cultures having widely different cell age (expone ...	2002	12214648
trophic relations in two lakes from the bulgarian black sea coast and possibilities for their restoration.	based on quantitative data on nutrients, light penetration, phytoplankton, zooplankton and zoobenthos obtained in the period 1992-1994 the relations between trophic levels were studied by means of statistical analysis. the two lakes are distinguished by relatively high transfer efficiency between phytoplankton and zooplankton, which depends on the size distribution among zooplankton and percentage of blue-green algae. the bottom up influence seems to prevail over the top-down influence, water su ...	2002	12420960
involvement of the hap gene (mucinase) in the survival of vibrio cholerae o1 in association with the blue-green alga, anabaena sp.	mucinase is a soluble haemagglutinin protease, which may be important for the survival of vibrio cholerae in association with mucilaginous blue-green algae (cyanobacteria). a comparative survival study was carried out with an anabaena sp. and a wild-type v. cholerae o1 strain hap+ gene (haemagglutinin-protease), together with its isogenic mutant hap (hap-deleted gene). a simple spread plate technique was followed to count culturable v. cholerae o1 on taurocholate tellurite gelatin agar plate. th ...	2002	12455611
a butyrylcholinesterase in the early development of the brine shrimp (artemia salina) larvae: a target for phthalate ester embryotoxicity?	the phthalate ester insensitive blue-green algae (synechococcus lividus) were used as a food source to extend the survival of synchronously hatched brine shrimp (artemia salina) larvae allowing measurement of a reduced toxic response to phthalate esters at late post-hatching stages of development. the maximum acute toxicity due to di-n-butyl phthalate (dnbp) correlated with the expression of a phthalate ester-hydrolyzing enzyme. the purified enzyme was identified as a butyrylcholinesterase due t ...	2002	12459190
on the natural diet of daphnia laevis in the eutrophic pampulha reservoir (belo horizonte, minas gerais).	the aim of this study was to assess the major food items ingested by adult specimens of daphnia laevis within the eutrophic pampulha reservoir in belo horizonte, minas gerais, brazil. the gut content was analyzed after addition of sodium hypochlorite and also through the examination of dissected guts under scanning electron microscopy. the results showed that chlorophyceae was the main food item ingested, representing c. 80.5% of the total ingested food. moreover, eutetramorus fottii, coelastrum ...	2002	12530180
water treatment plants assessment at talkha power plant.	talkha power plant is the only power plant located in el-mansoura. it generates electricity using two different methods by steam turbine and gas turbine. both plants drew water from river nile (208 m3 /h). the nile raw water passes through different treatment processes to be suitable for drinking and operational uses. at talkha power plant, there are two purification plants used for drinking water supply (100 m3/h) and for water demineralization supply (108 m3/h). this study aimed at studying th ...	2002	17216967
interaction between microcystins of different hydrophobicities and lipid monolayers.	microcystins (mc) are a group of amphiphatic peptide hepatotoxins and protein phosphatase inhibitors produced by certain cyanobacteria (blue-green algae). microcystins are believed to require an active transport mechanism to penetrate the plasma membranes of animal cells. in this study the surface barostat technique showed that two more hydrophobic microcystins mc-lf, containing leu and phe, and mc-lw, containing leu and trp, had a higher surface activity on an egg phosphatidylcholine-cholestero ...	2003	12565758
inhibition of enterovirus 71-induced apoptosis by allophycocyanin isolated from a blue-green alga spirulina platensis.	enterovirus 71 infection causes significant morbidity and mortality in children, yet there is no effective treatment. in this study, a protein-bound pigment, allophycocyanin purified from blue-green algae is first reported to exhibit anti-enterovirus 71 activity. allophycocyanin neutralized the enterovirus 71-induced cytopathic effect in both human rhabdomyosarcoma cells and african green monkey kidney cells. the 50% inhibitory concentration of allophycocyanin for neutralizing the enterovirus 71 ...	2003	12629652
cyst-based toxicity tests. xi. influence of the type of food on the intrinsic growth rate of the rotifer brachionus calyciflorus in short-chronic toxicity tests.	as important members of zooplankton communities worldwide, rotifers are used extensively in ecotoxicological research. chronic rotifer tests are, however, dependent on live algal food which adds to the complexity, the variability and the costs of these bioassays. to bypass the former problem, experiments have been undertaken with the freshwater rotifer brachionus calyciflorus, to determine their intrinsic growth rate (r) when fed for 48 h on a mixture of green algae (raphidocelis subcapitata rec ...	2003	12656256
multiple splice variants encode a novel adenylyl cyclase of possible plastid origin expressed in the sexual stage of the malaria parasite plasmodium falciparum.	we report the characterization of an unusual adenylyl cyclase gene from plasmodium falciparum, here designated pfacalpha. the level of mrna expression is maximum during development of gametocytes (the sexual blood stage of the parasite life cycle). the gene is highly interrupted by 22 introns, and reverse transcriptase-pcr analysis revealed that there are multiple mrna splice variants. one intron has three alternative 3'-splice sites that confer the potential to encode distinct forms of the enzy ...	2003	12668669
c-phycocyanin, a selective cyclooxygenase-2 inhibitor, induces apoptosis in lipopolysaccharide-stimulated raw 264.7 macrophages.	c-phycocyanin (c-pc) is one of the major biliproteins of spirulina platensis, a blue green algae, with antioxidant and radical scavenging properties. it is also known to exhibit anti-inflammatory and anti-cancer properties. however, the mechanism of action of c-pc is not clearly understood. previously, we have shown that c-pc selectively inhibits cyclooxygenase-2 (cox-2), an inducible isoform that is upregulated during inflammation and cancer. in view of the reported induction of apoptosis in ca ...	2003	12711327
cyanobacterial toxins: a growing environmental concern.	unusual blooms of toxic cyanobacteria in water bodies have drawn attention of environmentalists world over. major blooms of anabaena, microcystis and nodularia in water storage reservoirs, rivers and lakes leading to adverse health effects have been reported from australia, england and many other parts of the world. an overview of the morphology and taxonomy of these toxic blue-green algae; their possible sources of contamination including dietary supplements and their potential to cause hepatot ...	2003	12729683
microalgal metabolites.	the extraordinary chemical diversity seen in the cyanobacteria (blue-green algae) is especially pronounced in the ubiquitous tropical marine species, lyngbya majuscula. the gene clusters responsible for the production of some of the secondary metabolites have recently been elucidated. the dinoflagellates, which are lower eukaryotic algae, also demonstrate chemical diversity and produce unique polycyclic ethers of polyketide origin. a new mechanism for the formation of the truncated polyketide ba ...	2003	12831899
simulation of carbon reserve dynamics in microcystis and its influence on vertical migration with yoyo model.	blue-green algae control their buoyancy depending upon the surrounding conditions. this process is essential for cyanobacteria development and can account for their dominance in eutrophic waters in summer. in order to determine the main regulating factors of those movements, we developed a mechanistic and deterministic model, based on differential equations, that simulates the vertical migration of microcystis sp. in microcystis, buoyancy regulation results from the dynamics of the carbohydrate ...	2003	12876887
bio-diversity: an effective safety net against environmental pollution.	biodiversity is the feedstock for the biotechnology industry. hence, the conservation, enhancement and sustainable and equitable use of biodiversity should be accorded high priority in all national environment protection programmes. lichens serve as useful indicators of environmental health. similarly, several blue green algae help to sequester salt from water. there is need for the more widespread use of such biomonitoring and bioremediation agents. bioprospecting research designed to identify ...	2003	12963289
new cyanopeptide-derived low molecular weight thrombin inhibitors.	thrombosis is the result of defective regulation of the hemostasis system. this cardiovascular disorder may lead to deep vein thrombosis, myocardial infarction, and stroke. the majority of current drug research is focused on finding inhibitors of thrombin - the global player in hemostasis. in our work, we emphasize investigation of the marine environment to yield new lead structures from marine organisms like blue-green algae (cyanobacteria). this article deals with the design, syntheses, and in ...	2003	14502757
aquatic macrophytes as feeding site for small fishes in the rosana reservoir, paranapanema river, southeastern brazil.	in the present investigation we studied the feeding habits of the fishes associated with aquatic macrophytes in the rosana reservoir, southeastern brazil. twenty fish species were collected during four field trips, regularly distributed across the dry and wet seasons. focal snorkeling observations of the fishes were made over a total of six hours. nine species were present in abundances of more than 1% and, therefore, had their feeding habits analyzed. hemigrammus marginatus, roeboides paranensi ...	2003	14509843
chlorination for degrading saxitoxins (paralytic shellfish poisons) in water.	chlorination was investigated as a treatment option for degrading and thus removing saxitoxins (paralytic shellfish poisons, psps) produced by cyanobacteria (blue-green algae) from water. it was found to be effective with the order of ease of degradation of the saxitoxins being gtx5 (b1) approximately dcstx > stx > gtx3 approximately c2 > c1 > gtx2. however the effectiveness of chlorine was ph dependent. degradation as a function of ph was not linear with the degree of degradation increasing rap ...	2003	14733387
phycocyanin-mediated apoptosis in ak-5 tumor cells involves down-regulation of bcl-2 and generation of ros.	c-phycocyanin, which is a major biliprotein of the blue-green algae, has been shown to possess cyclooxygenase-2 inhibitory activity. we have studied the effect of phycocyanin on a rat histiocytic tumor line. ak-5 cells are induced into apoptotic death program when treated with phycocyanin, which involves the activation of caspase-3. phycocyanin-mediated apoptotic death is induced through the generation of reactive oxygen radicals. free radical scavengers inhibited phycocyanin-induced apoptotic d ...	2003	14617790
genotoxicity of microcystin-lr in human lymphoblastoid tk6 cells.	toxic cyanobacteria (blue-green algae) water blooms have become a serious problem in several industrialized areas of the world. microcystin-lr (mclr) is a cyclic heptapeptidic toxin produced by the cyanobacteria. in the present study, we used human lymphoblastoid cell line tk6 to investigate the in vitro genotoxicity of mclr. in a standard 4h treatment, mclr did not induce a significant cytotoxic response at <80 microg/ml. in a prolonged 24h treatment, in contrast, it induced cytotoxic as well a ...	2004	14706513
hypomagnesemia among cows in a confinement-housed dairy herd.	between january and march 2002, 55 cows in a 1,200-cow commercial dairy herd in south florida died. most of the cows that were found dead did not have any clinical signs of disease prior to death. because of a history of a feed change, a bloom of blue-green algae in cow cooling ponds, and initial necropsy findings of moderate enteritis, the preliminary differential diagnosis included clostridial enteritis, blue-green algae toxicosis, and mycotoxicosis. rumen acidosis, hypomagnesemia, and heavy m ...	2004	14710884
revegetating fly ash landfills with prosopis juliflora l.: impact of different amendments and rhizobium inoculation.	a revegetation trial was conducted to evaluate the feasibility of growing a legume species, prosopis juliflora l., on fly ash ameliorated with combination of various organic amendments, blue-green algal biofertilizer and rhizobium inoculation. significant enhancements in plant biomass, photosynthetic pigments, protein content and in vivo nitrate reductase activity were found in the plants grown on ameliorated fly ash in comparison to the plants growing in unamended fly ash or garden soil. higher ...	2004	14987858
characterizing algogenic organic matter (aom) and evaluating associated nf membrane fouling.	occasional algal blooms, comprised of blue-green algae and/or green algae, cause significant challenges in drinking water treatment due to the release of algogenic organic matter (aom) into water extracellularly and, upon cell lysis, intracellularly. aom has been extracted from blue-green algae (cyanobacteria) by various means and analyzed by uv absorbance scanning, hpsec-uv-fluorescence-doc, uv absorbance ratio index (uri), ftir, and fluorescence excitation emission matrix (eem). aom extracted ...	2004	15016519
the respiratory chain of blue-green algae (cyanobacteria).	electron transport components on the way from reduced substrates to the terminal respiratory oxidase(s) are discussed in relation to analogous and/or homologous enzymes and electron carriers in the generally much better known bacteria, mitochondria and chloroplasts. the kinetic behaviour of the components, their localization within the cell and their evolutionary position are given special attention. pertinent results from molecular genetics are also mentioned. the unprecedented role of cyanobac ...	2004	15032833
synthesis of pyrazole derivatives and their evaluation as photosynthetic electron transport inhibitors.	two series of new pyrazoles, namely six pyrazolo[1,5-a][1,3,5]triazine-2,4-dione and four pyrazolo[1,5-c][1,3,5]thiadiazine-2-one derivatives, were synthesized as potential inhibitors of the photosynthetic electron transport chain at the photosystem ii level. the compounds were confirmed by 1h nmr, elemental, and ir analyses. their biological activity was evaluated in vivo upon both the growth of blue-green algae and the photosynthetic oxygen evolution by eukaryotic algae and in vitro as the abi ...	2004	15053526
[investigation of microcystin pollution on dong lake, wuhan city].	to investigate the level of pollution of microcystin and its changing in freshwater lake and fish.	2004	15098475
sediment toxicity and community composition of benthos and colonized periphyton in the everglades-florida bay transitional zone.	this survey provides information on sediment toxicity and structural characteristics of the macrobenthic and periphytic algal communities at 10 locations in northeast florida bay. whole sediments were not acutely toxic to mysidopsis bahia (marine invertebrate) and hyalella azteca (freshwater invertebrate) relative to reference sediment. survival was between 80% and 100%. community structure of the macrobenthos and algal-periphyton varied spatially. a total of 116 benthic species were identified ...	2004	15217247
a randomized, placebo-controlled, crossover clinical trial of super blue-green algae in patients with essential blepharospasm or meige syndrome.	to evaluate the effectiveness of super blue-green algae (sbga) supplements on the severity of essential blepharospasm treated with botulinum toxin a injections.	2004	15234278
treatment of taste and odor material by oxidation and adsorption.	massive blooms of blue-green algae in reservoirs produce the musty-earthy taste and odor, which are caused by compounds such as 2-mib and geosmin. 2-mib and geosmin are rarely removed by conventional water treatment. their presence in the drinking water, even at low levels (ng/l), can be detected and it creates consumer complaints. so those concentrations have to be controlled as low as possible in the drinking water. the removals by oxidation (o3, cl2, clo2) and adsorption (pac, filter/adsorber ...	2004	15237637
profile of resistance of human immunodeficiency virus to mannose-specific plant lectins.	the mannose-specific plant lectins from the amaryllidaceae family (e.g., hippeastrum sp. hybrid and galanthus nivalis) inhibit human immunodeficiency virus (hiv) infection of human lymphocytic cells in the higher nanogram per milliliter range and suppress syncytium formation between persistently hiv type 1 (hiv-1)-infected cells and uninfected cd4(+) t cells. these lectins inhibit virus entry. when exposed to escalating concentrations of g. nivalis and hippeastrum sp. hybrid agglutinin, a variet ...	2004	15367629
salubrious effect of c-phycocyanin against oxalate-mediated renal cell injury.	c-phycocyanin, a biliprotein pigment found in some blue green algae (spirulina platensis) with nutritional and medicinal properties, was investigated for its efficacy on sodium oxalate-induced nephrotoxicity in experimentally induced urolithic rats.	2004	15369755
a proposal for further integration of the cyanobacteria under the bacteriological code.	this taxonomic note reviews the present status of the nomenclature of the cyanobacteria under the bacteriological code. no more than 13 names of cyanobacterial species have been proposed so far in the international journal of systematic and evolutionary microbiology (ijsem)/international journal of systematic bacteriology (ijsb), and of these only five are validly published. the cyanobacteria (cyanophyta, blue-green algae) are also named under the botanical code, and the dual nomenclature system ...	2004	15388760
acute skin irritant effects of cyanobacteria (blue-green algae) in healthy volunteers.	to assess the skin irritant potential of a range of laboratory grown cyanobacterial species using skin-patch testing on human volunteers.	2004	15707167
detection and analysis of the cyanobacterial peptide hepatotoxins microcystin and nodularin using seldi-tof mass spectrometry.	surface-enhanced laser desorption ionization mass spectrometry (seldi-tofms) was used to develop a new and useful method for determination and identification of the cyanobacterial (blue-green algae) toxins: microcystin and nodularin. the technique, combining chromatography and ms, enables microcystin/nodularin capture, purification, analysis, and processing from complex biological mixtures directly onto a hydrophobic chip. factors affecting ion intensities, including matrix concentration and las ...	2004	15450932
[variability of the clonal structure of yersinia pseudotuberculosis population under different conditions].	in a series of experiments the dynamics of the clonal structure of y. pseudotuberculosis population was evaluated by cytopathogenicity in soil extract, as well as in associations with blue-green algae (cyanobacteria) and infusoria, under different temperature conditions. in all variants of experiments made at low environmental temperature (10 degrees c) a considerable part of y. pseudotuberculosis clones (25-40%) was found to be cytopathogenic, while at 22 degrees c such clones were absent or ha ...	2004	15481916
[biocenosis of the natural foci of sapronotic infections (the results of 15-year observations)].	the summarized results of original studies, carried out in 1988-2003 by scientists of the gamaleya research institute of epidemiology and microbiology, are discussed. the part dealing with the regularity and mechanisms of the circulation of pathogenic bacteria in the biocenosis of soil and water reservoirs includes the following subjects: population and intracellular interactions with protozoa; the evaluation of different representatives of hydrobios as hosts and the transmission along trophic b ...	2004	15481938
isolation and characterization of a bacterium capable of removing taste- and odor-causing 2-methylisoborneol from water.	2-methylisoborneol (mib), a metabolite of blue-green algae, has been implicated in causing unpalatable drinking water throughout the world. current non-biological water treatment technologies are ineffective in removing mib from potable water or are cost-prohibitive, and biological applications may address these problems. we have isolated and characterized a bacterium derived from lake water and capable of aerobically degrading mib. light microscopy and transmission electron microscopy revealed ...	2004	15491661
six years of operation of a fluidised bed reactor for denitrification.	at himmerfjärden wastewater treatment plant, a fluidised bed reactor for nitrogen removal has been operated since 1997. despite its small footprint, the system enables a far-reaching nitrogen removal. the current nitrate reduction in the reactor is 95%. the reduction of total nitrogen at the wastewater treatment plant is 80-90% at normal operation. the concentration of nitrate in the effluent is easily controlled by changing the dose of carbon. as part of a series of full-scale experiments, the ...	2004	15553464
[hepatotoxicity of the microcystin cyanotoxin].	at public health, there is increasingly interest on evaluating the possibility of human intoxication by biotoxins from blue-green algae, mainly the hepatotoxins from the microcystin group. microcystin, a monocyclic heptapeptide, is mainly produced by a cyanobacteria called microcistis aeruginosa. it is characterized by a few variable amino acids, from which two of them have an unusual structure and play an important role in the hepatotoxicity of the microcystin. although human illnesses include ...	2004	15586902
biosorption of cr3+, cd2+ and cu2+ ions by blue-green algae spirulina sp.: kinetics, equilibrium and the mechanism of the process.	the process of biosorption of heavy metal ions (cr3+, cd2+, cu2+) by blue-green algae spirulina sp. is discussed in this paper. spirulina sp. was found to be a very efficient biosorbent. the aim of the present study was to investigate quantitatively the potential binding sites present at the surface of spirulina sp., using both potentiometric titrations and adsorption isotherms. the kinetic experiments showed that the process equilibrium was reached quickly, in less than 5-10 min. it was found t ...	2005	15698647
overview of key phytoplankton toxins and their recent occurrence in the north and baltic seas.	the frequency and intensity of harmful algal blooms (habs) appear to be on the rise globally. there is also evidence of the geographic spreading of toxic strains of these algae. consequently, methods had to be established and new ones are still needed for the evaluation of possible hazards caused by increased algal toxin production in the marine food chain. different clinical effects of algae-related poisoning have attracted scientific attention; paralytic shellfish poisoning, diarrhetic shellfi ...	2005	15712332
occurrence and elimination of cyanobacterial toxins in drinking water treatment plants.	toxin-producing cyanobacteria (blue-green algae) are abundant in surface waters used as drinking water resources. the toxicity of one group of these toxins, the microcystins, and their presence in surface waters used for drinking water production has prompted the world health organization (who) to publish a provisional guideline value of 1.0 mug microcystin (mc)-lr/l drinking water. to verify the efficiency of two different water treatment systems with respect to reduction of cyanobacterial toxi ...	2005	15737677
toxic potential of five freshwater phormidium species (cyanoprokaryota).	among the cyanoprokaryota (blue-green algae), the genus phormidium has thus far rarely been studied with respect to toxin production and potentially resulting human and environmental health effects. we here show that five previously unexplored freshwater species of this genus (ph. bijugatum, ph. molle, ph. papyraceum, ph. uncinatum, ph. autumnale) are indeed capable of producing bioactive compounds. phormidium extracts caused weight loss as well as neuro/hepatotoxic symptoms in mice, and in the ...	2005	15804520
toxic cyanobacterial cells containing microcystins induce oxidative stress in exposed tilapia fish (oreochromis sp.) under laboratory conditions.	the effects of microcystins from cyanobacterial cells on various oxidative stress biomarkers in liver, kidney and gill tissues in freshwater tilapia fish (oreochromis sp.) were investigated under laboratory conditions. microcystins are a family of cyclic peptide toxins produced by species of freshwater cyanobacteria (blue-green algae). fish were exposed to the cyanobacterial cells in two ways: mixed with a commercial fish food or crushed into a commercial fish food so that the toxins were releas ...	2005	15820106
environmental impacts of cooling system on abou qir bay.	this study was conducted to evaluate the impacts of cooling water on cooling system of abou qir power plant and on the receiving abou qir bay. abou qir power plant is a conventional steam electric power plant located in alexandria governorate, egypt. water and biota samples were collected monthly from cooling water and abou qir bay over a year. heavy metals, radionuclide, anions and total hydrocarbons were analyzed in the samples using instrumental neutron activation analysis (inaa), gamma-ray s ...	2005	17187744
improved method for the determination of anatoxin-a and two of its metabolites in blue-green algae using liquid chromatography with fluorescence detection.	anatoxin-a, a neurotoxin produced by blue-green algae (bga) species, can cause death to exposed organisms. in north america, bga are harvested and sold as food supplements, some of which contain elevated levels of other algal toxins, such as microcystins. concern that elevated levels of anatoxin-a also may be present in bga food supplements has led to the development of a simple method to determine the presence of anatoxin-a in bga. some researchers have successfully analyzed this compound using ...	2005	16526457
removal of microcystins by phototrophic biofilms. a microcosm study.	microcystins (mcs) are a family of natural toxins produced by cyanobacteria (blue-green algae). as a result of eutrophication, massive cyanobacterial blooms occur more frequently and mcs represent important contaminants of freshwater ecosystems. bacterial biodegradation is considered a main mechanism for mc breakdown in environmental conditions. while existing studies were mostly focused on mc biodegradation by planktonic bacteria, our experiments examined the fate and kinetics of mc degradation ...	2005	16305143
protective effect of spirulina against doxorubicin-induced cardiotoxicity.	the generation of reactive oxygen species and mitochondrial dysfunction has been implicated in doxorubicin (dox)-induced cardiotoxicity. the aim of the present study was to determine whether spirulina, a blue-green algae, could serve as a cardioprotective agent during dox treatment in a mouse model. mice were treated with dox (4 mg/kg bw, intraperitoneally), weekly, for 4 weeks. spirulina was administered orally for 3 days twice daily, then for 7 weeks along with the four equal injections of dox ...	2005	16372368
[role of sodium ions and their uptake by cells of cultured blue-green algae, spirulina platensis and spirulina maxima].	the growth of the blue-green algae spirulina platensis and spirulina maxima, cultured in complete mineral zarouk medium containing na+ or na+-deficient medium, was studied over a period of 24 h. the optical densities of s. platensis and s. maxima cells, determined during the last hour of exposure to sodium deficiency, amounted to 55.6 and 32.6%, respectively, of the optical densities of the same cells grown in complete zarouk medium. moreover, the cultures grown in na+-deficient medium exhibited ...	2005	16400983
the bioenergetic role of dioxygen and the terminal oxidase(s) in cyanobacteria.	owing to the release of 13 largely or totally sequenced cyanobacterial genomes (see and ), it is now possible to critically assess and compare the most neglected aspect of cyanobacterial physiology, i.e., cyanobacterial respiration, also on the grounds of pure molecular biology (gene sequences). while there is little doubt that cyanobacteria (blue-green algae) do form the largest, most diversified and in both evolutionary and ecological respects most significant group of (micro)organisms on our ...	2005	15863101
fly-ash-induced oxidative stress and tolerance in prosopis juliflora l. grown on different amended substrates.	field experiments were conducted to study the impact of metal accumulation on malondialdehyde (mda), cysteine and non-protein thiol (npsh) contents in the plants of prosopis juliflora grown on the fly ash (fa) amended with soil, blue green algae (bga) biofertilizer, farm yard manure, press mud and rhizobium inoculation. the analysis of data revealed that the level of mda, cysteine and npsh was higher in the roots of the plant than leaves, which was found positively correlated with metal accumula ...	2005	15869202
occurrence of toxic blue-green algae in the kucukcekmece lagoon (istanbul, turkey).	the concentration of microcystin (mc) in the kucukcekmece lagoon, istanbul, turkey, and the physicochemical and biological parameters of water quality were investigated from october 2000 to june 2003. water samples were collected from surface waters at three sites. most bloom samples were dominated by microcystis aeruginosa. the major microcystin variants detected by hplc-pda were microcystin-yr and microcystin-lr. microcystin concentration increased dramatically from early summer to early autum ...	2005	15892069
cyanobacteria and earthy/musty compounds found in commercial catfish (ictalurus punctatus) ponds in the mississippi delta and mississippi--alabama blackland prairie.	the compounds responsible for earthy and musty "off-flavors" in farm-raised channel catfish (ictalurus punctatus) in the southeastern united states of america are geosmin and 2-methylisoborneol (mib), respectively. these compounds are produced by certain species of cyanobacteria (blue-green algae) that grow in the aquaculture ponds. previous research has focused on the species of cyanobacteria found in catfish ponds in west mississippi (the leading region of catfish production in the usa), while ...	2005	15993924
fresh water blue green algae from three agro-climatic zones of uttar pradesh, india: distribution pattern with seasonal variation.	the paper deals with 45 species of 21 genera of fresh water blue green algae (bga) from three different agro-climatic zones of uttar pradesh. samples were collected from different habitats varying in physico-chemical properties. out of 45 species, 13 species belonged to order chroococcales, 31 to order nostocales, while only 1 species belonged to order stigonimatales i.e. fischerella mucicola. the physico-chemical parameters like ph, temperature, dissolved oxygen, electrical conductivity, nitrat ...	2005	16114457
potential developmental toxicity of anatoxin-a, a cyanobacterial toxin.	some 2000 species of cyanobacteria (blue-green algae) occur globally in aquatic habitats. they are able to survive under a wide range of environmental conditions and some produce potent toxins. toxin production is correlated with periods of rapid growth (blooms) and 25%-70% of blooms may be toxic. anatoxin-a is an alkaloid neurotoxin that acts as a potent neuro-muscular blocking agent at the nicotinic receptor. acute toxicity, following consumption of contaminated water, is characterized by rapi ...	2005	16127666
comparative effects of the blue green algae nodularia spumigena and a lysed extract on detoxification and antioxidant enzymes in the green lipped mussel (perna viridis).	nodularia spumigena periodically proliferates to cause toxic algal blooms with some aquatic animals enduring and consuming high densities of the blue green algae or toxic lysis. n. spumigena contains toxic compounds such as nodularin and lipopolysaccharides. this current work investigates physiological effects of exposure from bloom conditions of n. spumigena cells and a post-bloom lysis. biochemical and antioxidative biomarkers were comparatively studied over an acute 3-day exposure. in general ...	2005	16291202
bioactive compounds from cyanobacteria and microalgae: an overview.	cyanobacteria (blue-green algae) are photosynthetic prokaryotes used as food by humans. they have also been recognized as an excellent source of vitamins and proteins and as such are found in health food stores throughout the world. they are also reported to be a source of fine chemicals, renewable fuel and bioactive compounds. this potential is being realized as data from research in the areas of the physiology and chemistry of these organisms are gathered and the knowledge of cyanobacterial ge ...	2005	16294828
cyanobacterial toxins--occurrence, biosynthesis and impact on human affairs.	mass developments of cyanobacteria ("blue-green algae") in lakes and brackish waters have repeatedly led to serious concerns due to their frequent association with toxins. among these are the widespread hepatotoxins microcystin (mc) and nodularin (nod). here, we give an overview about the ecostrategies of the diverse toxin-producing species and about the genes and enzymes that are involved in the biosynthesis of the cyclic peptides. we further summarize current knowledge about toxicological mech ...	2006	16304634
optimization of anabaenopeptin extraction from cyanobacteria and the effect of methanol on laboratory manipulation.	anabaenopeptins are commonly occurring bioactive peptides of cyanobacterial origin. cyanobacteria (blue-green algae) are known to be capable of producing a large number of biologically active peptides, but the widespread occurrence of anabaenopeptins in particular, makes them ideal candidates for investigating the reasons that cyanobacteria produce such a complex spectrum of peptides and the wider implications of their natural function(s). despite the identification of these peptides in cyanobac ...	2006	16099074
a multicenter phase ii study of the cryptophycin analog ly355703 in patients with platinum-resistant ovarian cancer.	ly355703 is a synthetic product structurally related to the cryptophycin family isolated from the blue-green algae, which exerts a potent destabilization of microtubules during mitosis. this study was performed to determine the activity of ly355703 in patients with platinum-resistant advanced ovarian cancer and to characterize its toxicity profile. twenty-six patients were enrolled in this study. resistant disease was defined as a platinum-free interval of <6 months from primary treatment or rec ...	2006	16445613
differential oxidative stress responses to microcystins lr and rr in intraperitoneally exposed tilapia fish (oreochromis sp.).	increasing evidence suggests that oxidative stress may play a significant role in causing microcystin (mcs) toxicity not only in mammals, but also in fish. mcs are a family of cyclic peptide toxins produced by some species of freshwater cyanobacteria (blue-green algae). among the microcystins, mc-lr is the most extensively studied. in the present study the differential response of the antioxidant enzymes superoxide dismutase (sod), catalase (cat), glutathione peroxidase (gpx) and glutathione red ...	2006	16455146
the acute and chronic toxicity of hexadecyl and heptadecyl sulfate to aquatic organisms.	hsas (high-solubility alkyl sulfate) is a new anionic surfactant composed predominantly of methyl and ethyl branched hexadecyl and heptadecyl sulfate. effects of hsas on a wide range of fish, algae, and invertebrates were investigated in conventional laboratory toxicity tests as well as in exposures conducted as part of an experimental stream model ecosystem study. for invertebrates and fish, c(16.7)hsas (average alkyl chain length 16.7) acute lc(50) values ranged from 0.23 (channel catfish) to ...	2006	16465560
renoprotective effect of spirulina fusiformis on cisplatin-induced oxidative stress and renal dysfunction in rats.	cisplatin is an effective chemotherapeutic agent used in the treatment of a wide array of both pediatric and adult malignancies. dose-dependent and cumulative nephrotoxicity is the major toxicity of this compound, sometimes requiring a reduction in dose or discontinuation of treatment. recent evidences have implicated oxidative and nitrosative stress in cisplatin-induced nephrotoxicity. spirulina fusiformis, blue-green algae, is claimed to be a potential antioxidant. the present study was design ...	2006	16703798
monitoring algal toxins in lake water by liquid chromatography tandem mass spectrometry.	microcystins (mcs) and cylindrospermopsin (cyl) are potent natural toxins produced by cyanobacteria (blue-green algae) that grow worldwide in eutrophic freshwaters and cause animal and human water-based toxicoses. the main purpose of this work has been assessing the contamination levels of some mcs and cyl in eutrophic italian lake (albano) water. to do this, we have developed an original analytical method involving mc extraction with a sorbent (carbograph 4) cartridge. cyl is a highly polar com ...	2006	16719091
regulatory system for light-responsive gene expression in photosynthesizing bacteria: cis-elements and trans-acting factors in transcription and post-transcription.	cyanobacteria (blue-green algae) are photosynthesizing organisms that can be used as a model for analyzing light-responsive gene expression. the regulatory system of the light-responsive psba gene with cis-elements and trans-acting factors was studied at both transcriptional and post-transcriptional levels. positive regulation comprises dna curvatures (cit and rib), upstream elements (upe and promoter), and a light-induced sigma factor (sigd) of rna polymerase in transcription. on the other hand ...	2006	16556970
oxidation of the cyanobacterial hepatotoxin microcystin-lr by chlorine dioxide: influence of natural organic matter.	cyanobacteria (blue-green algae) are known producers of cytotoxic, hepatotoxic, and neurotoxic compounds with severe acute and chronic effects on vertebrates. successful removal of these toxins in drinking water treatment is therefore of importance for public health. in the present work the oxidation of the cyanobacterial hepatotoxin microcystin-lr (mc-lr) by chlorine dioxide (clo2) was studied at natural microcystin concentrations (10 microg l(-1)) and normal clo2 dosages (1 mg l(-1)) in the ab ...	2006	16568763
effect of spirulina, a blue green algae, on gentamicin-induced oxidative stress and renal dysfunction in rats.	gentamicin (gm), an aminoglycoside, is widely employed in clinical practice for the treatment of serious gram-negative infections. the clinical utility of gm is limited by the frequent incidence of acute renal failure. experimental evidences suggest that oxidative and nitrosative stress play an important role in gm nephrotoxicity. spirulina fusiformis is a blue green algae with potent free radical scavenging properties. the present study was designed to investigate renoprotective potential of s. ...	2006	16573712
structural and functional characterization of microcystin detoxification-related liver genes in a phytoplanktivorous fish, nile tilapia (oreochromis niloticus).	liver genes related to phase i and phase ii detoxification, as well as inhibition of reactive oxygen species (ros) production, were cloned, and their response to microcystin-lr (mc-lr) and lipopolysaccharide (lps) exposure via intraperitoneal injection, was determined in a phytoplanktivorous fish, nile tilapia (oreochromis niloticus). the cloned full-length cdna of tilapia soluble glutathione s-transferase (sgst) was classified as alpha-class gst based on their amino acid sequence identity with ...	2006	17045849
petroleum pollutant degradation by surface water microorganisms.	it is well known that the composition of petroleum or some of its processing products changes in the environment mostly under the influence of microorganisms. a series of experiments was conducted in order to define the optimum conditions for an efficient biodegradation of petroleum pollutant, or bioremediation of different segments of the environment. the aim of these investigations was to show to what extent the hydrocarbons of a petroleum pollutant are degraded by microbial cultures which wer ...	2006	17067026
cyanobacteria toxins in the salton sea.	the salton sea (ss) is the largest inland body of water in california: surface area 980 km2, volume 7.3 million acre-feet, 58 km long, 14-22 km wide, maximum depth 15 m. located in the southeastern sonoran desert of california, it is 85 m below sea level at its lowest point. it was formed between 1905 and 1907 from heavy river flows of the colorado river. since its formation, it has attracted both people and wildlife, including flocks of migratory birds that have made the salton sea a critical s ...	2006	16623944
lc/esi/ms method development for the analysis of hepatotoxic cyclic peptide microcystins in animal tissues.	microcystins (mcysts) are a family of related cyclic heptapeptides produced by several genera and species of blue-green algae (cyanobacteria). mcysts are potent and specific inhibitors of the serine threonine family of protein phosphatases, especially pp1 and pp2a. mcysts inhibit a liver's protein phosphatase by forming a covalent linkage between mcysts' mdha residue and the phosphatase's cysteine residue. due to the covalent linkage, analysis of mcysts in animal tissues has been limited to dete ...	2006	16626770
antioxidant properties of recombinant allophycocyanin expressed in escherichia coli.	allophycocyanin (apc) is the main core component of phycobilisome found in blue-green algae. the apo-allophycocyanin and its subunits were expressed in escherichia coli and their antioxidant properties were evaluated using deoxyribose assay. the result showed that both recombinant allophycocyanin fused with maltose binding protein (mbp) tag and 6 x his-tag and their alpha or beta subunits can scavenge hydroxyl radicals successfully, and the separated alpha or beta subunits had a higher inhibitio ...	2006	16647860
elisa and lc-ms/ms methods for determining cyanobacterial toxins in blue-green algae food supplements.	the use of natural products as a diet supplement is increasing worldwide but sometimes is not followed by adequate sanitary controls and analyses. twenty samples of pills and capsules of lyophilised cyanobacteria (blue-green algae), commercialised in italy as dietary supplements, were found positive at the vibrio fischeri bioassay. further analyses with elisa and lc-ms/ms methods revealed the presence of four microcystin (mc) analogues, mc-lr, -yr, -la, -rr and two demethylated forms of mc-rr. t ...	2006	16753920
low-pressure membrane (mf/uf) fouling associated with allochthonous versus autochthonous natural organic matter.	natural organic matter (nom) isolates/fractions; organic colloids, and hydrophobic (hpo), transphilic (tpi), and hydrophilic (hpi) fractions; isolated from a natural surface water as an allochthonous source, and in the form of algal organic matter (aom) derived from blue green algae as an autochthonous source, were investigated in low-pressure membrane filtration. the most significant flux decline was caused by organic colloids, with an intermediate flux decline caused by aom derived (isolated) ...	2006	16777172
atomic structure of a nitrate-binding protein crucial for photosynthetic productivity.	cyanobacteria, blue-green algae, are the most abundant autotrophs in aquatic environments and form the base of all aquatic food chains by fixing carbon and nitrogen into cellular biomass. the single most important nutrient for photosynthesis and growth is nitrate, which is severely limiting in many aquatic environments particularly the open ocean. it is therefore not surprising that nrta, the solute-binding component of the high-affinity nitrate abc transporter, is the single-most abundant prote ...	2006	16777960
molecular cloning and characterization of alpha-class glutathione s-transferase gene from the liver of silver carp, bighead carp, and other major chinese freshwater fishes.	two full-length cdnas encoding glutathione s-transferase (gst) were cloned and sequenced from the hepatopancreas of planktivorous silver carp (hypophthalmichthys molitrix) and bighead carp (aristichthys nobilis). the silver carp and bighead carp gst cdna were 920 and 978 bp in length, respectively, and both contained an open reading frame that encoding 223 amino acids. partial gst cdna sequences were also obtained from the liver of grass carp (ctenopharyngodon idellus), crucian carp (carassius a ...	2006	16788955
survival of blue-green and green algae under stress conditions.	terrestrial blue-green algae scytonema millei, phormidium bohneri and lyngbya mesotricha survived to 100 % at atmospheric temperatures of 5-36 degrees c and relative humidity 55-100 % in rainy, winter and spring seasons but the survival was 15-25 % in summer when atmospheric temperature reached 48 degrees c and relative humidity was < or =23 %. microcoleus chthonoplastes maximum survival was =80 % in rainy season followed by a decrease to =1/2 and 1/4 level in winter and spring, respectively; it ...	2006	16821721
spirulina attenuates cyclosporine-induced nephrotoxicity in rats.	cyclosporine (csa) causes a dose-related decrease in renal function in experimental animals and humans. the generation of reactive oxygen species (ros) has been implicated in csa-induced nephrotoxicity. it was previously shown that spirulina, a blue-green algae, with antioxidant properties effectively attenuated the doxorubicin-induced cardiotoxicity in mice and cisplatin-induced nephrotoxicity in rat. the present study investigated the nephroprotective role of spirulina against csa-induced neph ...	2006	16858688
isolation and identification of antialgal compounds from the leaves of vallisneria spiralis l. by activity-guided fractionation.	vallisneria spiralis linn., a common submerged macrophyte, is widely available in quiet waters of lakes, ponds, marshes and streams in southeast asia. v. spiralis plays a significant role not only in decreasing eutrophication of water body for its productivity, but also in inhibiting the growth of blue-green algae? the aim of the paper involves the isolation and identification of allelochemicals from extracts of v. spiralis by activity-guided fractionation and column chromatography.	2006	16910120
[study progress on pollution and liver cancer promotion of microcystins].	eutrophication of fresh water lakes and ponds has caused the occurrence of cyanobacteria. microcystins (mcs) is a class of toxic cyclic heptapeptide, which may be produced by some strains of various blue-green algae. it has become potential hazardous material in aquatic environments for its toxic, distribution and stability. mcs has been showed to be extremely potent hepatotoxins and been viewed as a promoter of liver tumor. in this review, the pollution condition of mcs and its hepatotoxins as ...	2006	16921774
photodynamic action of c-phycocyanins obtained from marine and fresh water cyanobacterial cultures: a comparative study using epr spin trapping technique.	c-phycocyanins, major biliproteins of blue green algae (cyanobacteria), widely used as colourants in food and cosmetics are known for their antioxidant as well as therapeutic potential. recent claims indicating phycobiliproteins exert stronger photodynamic action on tumor cells than clinically approved hematoporphyrin derivatives motivate us to investigate the photodynamic action of two newly isolated c-phycocyanins from phormidium [phr] and lyngbya [ly] spp, respectively in comparison with know ...	2006	17015260
water quality and phytoplankton characteristics in the palk bay, southeast coast of india.	the present study was carried out to determine the water quality in terms of physicochemical characteristics and plankton distribution in the coastal waters of kattumavadi, palk bay for a period of one year from april 2002 to march 2003. air and surface water temperatures varied from 28 degrees c to 32.50 degrees c and from 27.5 to 32.0 degrees c while light extinction coefficient (lec) varied between 0.95 and 1.85. salinity ranged from 26.0 to 34.5 per thousand and the ph ranged between 7.95 an ...	2006	17402250
a comprehensive immunoassay for the detection of microcystins in waters based on polyclonal antibodies.	microcystins (mcs) are a group of closely related toxic cyclic heptapeptides produced by common cyanobacteria (blue-green algae), and microcystin-leucine-arginine (mc-lr) is among the most frequent and most toxic microcystin congeners. in this study, a free amino group was introduced to mc-lr at its seventh amino acid residue with 2-mercaptoethylamine, and the product aminoethyl-mc-lr was coupled to bovine serum albumin (bsa) and horseradish peroxidise (hrp) by glutaraldehyde to be complete anti ...	2006	17723494
generation and characterization of polyclonal antibodies against microcystins-application to immunoassays and immunoaffinity sample preparation prior to analysis by liquid chromatography and uv detection.	polyclonal antibodies against microcystin-lr (mc-lr), a cyclic heptapeptide toxin, were generated in rabbits using mc-lr-bsa. an enzyme-linked immunosorbent assay (elisa) was developed for the characterization of the antibodies and their potential use for analytical purposes. the concentration of mc-lr that inhibits 50% of antibody-antigen binding (ic(50)) was 0.5mugl(-1) for the indirect elisa format and 0.9mugl(-1) for the direct elisa, using mc-lr-horseradish peroxidase conjugate. the limit o ...	2006	18970757
larvicidal algae.	although most algae are nutritious food for mosquito larvae, some species kill the larvae when ingested in large quantities. cyanobacteria (blue-green algae) that kill larvae do so by virtue of toxicity. while blue-green algae toxins may offer possibilities for delivery as larvicides, the toxicity of live blue-green algae does not seem consistent enough for live algae to be useful for mosquito control. certain species of green algae in the order chlorococcales kill larvae primarily because they ...	2007	17855939
an ecologic and taxonomic study on phytoplankton of a shallow lake, turkey.	the middle black sea region has quite large wetlands, including lakes, rivers, ponds, marshs and large reservoirs. lake cernek is one of the most valuable wetlands in kizilirmak delta. the lake and its environment have a high biodiversity due to species richness and natural habitats. therefore, it has been recognized as a ramsar site. the phytoplankton of lake cemek consisted of 104 taxa belonging to cyanobacteria, bacillariophyta, chlorophyta, cryptophyta, dinophyta, euglenophyta and xanthophyt ...	2007	17929763
vitamin b12 sources and bioavailability.	the usual dietary sources of vitamin b(12) are animal foods, meat, milk, egg, fish, and shellfish. as the intrinsic factor-mediated intestinal absorption system is estimated to be saturated at about 1.5-2.0 microg per meal under physiologic conditions, vitamin b(12) bioavailability significantly decreases with increasing intake of vitamin b(12) per meal. the bioavailability of vitamin b(12) in healthy humans from fish meat, sheep meat, and chicken meat averaged 42%, 56%-89%, and 61%-66%, respect ...	2007	17959839
anti-inflammatory activity of c-phycocyanin in lipopolysaccharide-stimulated raw 264.7 macrophages.	c-phycocyanin (c-pc), found in blue green algae, is often used as a dietary nutritional supplement. c-pc has been found to have an anti-inflammatory activity and exert beneficial effect in various diseases. however, little is known about its mechanism of action. overproduction of nitric oxide (no) derived from inducible nitric oxide synthase (inos) plays an important role in the pathogenesis of inflammation. the aim of this study was to determine whether c-pc inhibits production of nitrite, an i ...	2007	17961604
cloning and biochemical characterization of the hectochlorin biosynthetic gene cluster from the marine cyanobacterium lyngbya majuscula.	cyanobacteria, or blue-green algae, are a rich source of novel bioactive secondary metabolites that have potential applications as antimicrobial or anticancer agents or useful probes in cell biology studies. a jamaican collection of the cyanobacterium lyngbya majuscula has yielded several unique compounds including hectochlorin ( 1) and the jamaicamides a-c ( 5- 7). hectochlorin has remarkable antifungal and cytotoxic properties. in this study, we have isolated the hectochlorin biosynthetic gene ...	2007	18001088
in vitro evaluation of protective effects of ascorbic acid and water extract of spirulina plantesis (blue green algae) on 5-fluorouracil-induced lipid peroxidation.	considering drug-induced lipid peroxidation as a possible mediator of drug-induced toxicity and exploiting the free radical scavenging action of antioxidants, the present study was designed to evaluate the protective effects of ascorbic acid (aa) and water extract of spirulina plantesis (sp) to minimize 5-fluorouracil (5-fu)-induced lipid peroxidation. the study has been performed in vitro using goat liver as an experimental model. this evaluation was done by measuring the malondialdehyde (mda), ...	2007	18536159
steroidal constituents of rice (rryza sativa) hulls with algicidal and herbicidal activity against blue-green algae and duckweed.	two new compounds, 14-methyl stigmast-9(11)-en-3alpha-ol-3beta-d-glucopyranoside (1) and cholest-11-en-3beta, 6beta, 7alpha, 22beta-tetraol-24-one-3beta-palmitoleate (2), along with the known compound beta-sitosteryl-3beta-d-glucopyranosyl-6'-linoleiate (3), were isolated from the methanolic extract of rice (oryza sativa) hulls. the structures of the two new compounds were elucidated using one- and two-dimensional nmr in combination with ir, ei/ms, fab/ms, hr-ei/ms and hr-fab/ms. in bioassays wi ...	2007	17439014
biomedicinals from the phytosymbionts of marine invertebrates: a molecular approach.	marine invertebrate animals such as sponges, gorgonians, tunicates and bryozoans are sources of biomedicinally relevant natural products, a small but growing number of which are advancing through clinical trials. most metazoan and anthozoan species harbour commensal microorganisms that include prokaryotic bacteria, cyanobacteria (blue-green algae), eukaryotic microalgae, and fungi within host tissues where they reside as extra- and intra-cellular symbionts. in some sponges these associated micro ...	2007	17560324