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minor nucleotides in trna from blue-green algae [proceedings]. 19806768618
[molecular organization and pigment composition of r-phycoerythrin from the red alga callithamnion rubosum].p3phycoerythrin is the major phycobiliprotein of rhodophyta and endows these algae with the characteristic color. r-phycoerythrin purified from red alga calithamnion rubosom is composed of four dissimilar polypeptide subunits, alpha, beta, gamma, and delta. in calibrated sds gel electrophoresis their molecular weights are 21 000, 21 600, 31 000 and 33 000 daltons, respectively. the stoichiometry of the subunits in the native protein is 9 alpha: 9 beta: 2 gamma: 1 delta. r-phycoerythrin carries t ...19846717417
on the evolutionary descent of organisms and organelles: a global phylogeny based on a highly conserved structural core in small subunit ribosomal rna.to probe the earliest evolutionary events attending the origin of the five known genome types (archaebacterial, eubacterial, nuclear, mitochondrial and plastid), we have analyzed sequences corresponding to a ubiquitous, highly conserved core of secondary structure in small subunit rrna. our results support (i) the existence of three primary lineages (archaebacterial, eubacterial, and nuclear), (ii) a specific eubacterial ancestry for plastids and mitochondria (plant, animal, fungal), and (iii) a ...19846462918
[poisoning in cattle caused by blue-green algae].this paper describes a case of poisoning by blue-green algae growing in a fresh water pond in goyena, provincia de buenos aires. the predominating algae were identified as microcystis aeruginosa. they show an intense growth when certain meteorologic condition prevail, in coincidence with certain chemical characteristics of the water. once this growth has occurred, the direction of the wind has a decisive role, because it determines the accumulation on the shore, increasing their concentration an ...19846443833
effect of the carbamate insecticide sevin on anabaena sp. and westiellopsis prolifica.effect of the insecticide sevin (50% w/v) was examined on survival, growth and nitrogen fixation of two filamentous blue-green algae, anabaena sp. and westiellopsis prolifica. lower concentration of the insecticide (10 micrograms/ml) increased survival, growth and nitrogen fixation while higher concentrations showed an inhibitory effect.19846443054
structure and function of respiratory membranes in cyanobacteria (blue-green algae). 19846433519
ferredoxin from aphanothece halophitica, a unicellular blue-green alga: close relationship to ferredoxins from filamentous blue-green algae and phylogenetic implications.the amino acid sequence of a ferredoxin from a unicellular blue-green alga, aphanothece halophitica, was established by the conventional methods. total number of residues was 98 lacking only tryptophan. a most probable phylogenetic tree was constructed for 19 algal ferredoxins on the basis of an amino acid difference matrix made from the sequence comparison. a. halophitica has been classified as a unicellular blue-green alga in the same genus to which aphanothece sacrum belongs, but the tree ind ...19836418732
amino acid sequence of a ferredoxin from bumilleriopsis filiformis, a yellow-green alga: relationship with red algae, protoflorideophyceae, and filamentous blue-green algae.the amino acid sequence of a [2fe-2s] ferredoxin isolated from bumilleriopsis filiformis, a yellow-green alga, was determined by using conventional techniques. it consisted of 98 amino acid residues with a microheterogeneity at the amino-terminus: ala/glu-thr-tyr-ser-val-thr-leu-val-asn-glu-glu-lys-asn-ile-asn-ala-val- ile- lys-cys-pro-asp-asp-gln-phe-ile-leu-asp-ala-ala-glu-glu-gln-gly-ile-glu- leu- pro-tyr-ser-cys-arg-ala-gly-ala-cys-ser-thr-cys-ala-gly-lys-val-leu-ser- gly- thr-ile-asp-gln-se ...19836418731
the cyanobacteriales: a legitimate order based on the type strain cyanobacterium stanieri?as a logical consequence of the definition of a bacterium (stanier and van niel, 1962), r. y. stanier created the name "cyanobacteria" as a replacement for "blue-green algae". as such, cyanobacteria entered the 8th issue of bergey's manual of determinative bacteriology 1974 as members of the procaryotae murray 1968, this kingdom being composed of two divisions, cyanobacteria and bacteria. an even tighter integration of cyanobacteria with other bacteria was proposed by gibbons and murray (1978) f ...19836416126
effect of temperature on chlorophyll stability of some subaerial blue-green algae.chlorophyll stability index of eight subaerial blue-green algal species, collected from their natural habitats, i.e., bark of trees, soil and roof-tops and from cultures, has been determined. the algae from natural habitats showed greater chlorophyll stability compared to those algae from cultures. among the natural algae, high chlorophyll stability was observed in the algae inhabiting adverse habitats. a slight modification in the method of murty and majumder (1962) for determination of chlorop ...19836415937
freshwater cyanobacteria (blue-green algae) and human health. 19836405135
apparent blue-green algae poisoning in swine subsequent to ingestion of a bloom dominated by anabaena spiroides. 19836403497
oxygen-dependent proton efflux in cyanobacteria (blue-green algae).the oxygen-dependent proton efflux (in the dark) of intact cells of anabaena variabilis and four other cyanobacteria (blue-green algae) was investigated. in contrast to bacteria and isolated mitochondria, an h+/e ratio (= protons translocated per electron transported) of only 0.23 to 0.35 and a p/e ratio of 0.8 to 1.5 were observed, indicative of respiratory electron transport being localized essentially on the thylakoids, not on the cytoplasmic membrane. oxygen-induced acidification of the medi ...19846327614
[adenylate kinase activity of phycobilisomes from the blue-green algae microcystis aerogenosa].the phycobilisomes (pbs) from the blue-green algae microcystis aerogenosa was found to possess the adenylate kinase activity. the enzyme activity of pbs is kept for 2 weeks, reaching its maximum on th 2nd-4th day after pbs isolation from the cells, and is retained after passage of freshly isolated pbs through a column with sephadex g-25. the adenylate kinase activity of pbs is thermostable, depends on the protein concentration in the sample, undergoes activation by white light and is inhibited b ...19816263373
electron microscopic localization of atpase activity in the cytopharyngeal basket of the ciliate pseudomicrothorax dubius.the cytopharyngeal basket of pseudomicrothorax dubius is used to ingest filamentous blue-green algae. the basket has three main components: a sheath of microfilaments, bundles of microtubules (the nemadesmata), and ribbons of microtubules. the ribbons of microtubules (nemadesmal lamellae) are adpressed to the food vacuole during ingestion. cytochemical techniques show that both the lamellae and the microfilamentous sheath possess atpase activity, but the reaction product appears under different ...19826215277
regulation of metallothionein synthesis in hela cells by heavy metals and glucocorticoids.metallothioneins (mts) are low molecular weight, cysteine-rich proteins that bind heavy metals. mt induction occurs in liver in response to either heavy metal (zn++ or cd++) administration or stress. the synthesis of mt can also be induced by either heavy metals or glucocorticoid hormones in hela cells cultured in serum-free medium. induction of mt by zinc is subject to "desensitization." in contrast, dexamethasone (dex) induction results in a continued elevation in the rate of mt synthesis. the ...19816162854
molecular evolution of chloroplast dna sequences.comparative data on the evolution of chloroplast genes are reviewed. the chloroplast genome has maintained a similar structural organization over most plant taxa so far examined. comparisons of nucleotide sequence divergence among chloroplast genes reveals marked similarity across the plant kingdom and beyond to the cyanobacteria (blue-green algae). estimates of rates of nucleotide substitution indicate a synonymous rate of 1.1 x 10(-9) substitutions per site per year. noncoding regions also app ...19846152869
oxygen inhibition of nitrogen fixation in cell-free preparations of blue-green algae. 19676078112
the metabolism of acetate by the blue-green algae, anabaena variabilis and anacystis nidulans. 19676077932
effect of carbohydrates on the symbiotic growth of planktonic blue-green algae with bacteria. 19676052729
the tocopherols of the blue-green algae. 19676048761
mevalonic acid kinase in euglena gracilis.the isolation and partial purification of mevalonic acid kinase from euglena gracilis is described. the product of the reaction mva-5-p has been characterized by paper chromatography. the apparent km values for l-mevalonic acid, atp, and mg(2+) are 3 x 10(-5)m, 6 x 10(-3)m, and 9 x 10(-3)m, respectively. a concentration of 1 x 10(-3)mp-hydroxymercuribenzoate completely inactivates the enzyme. a distribution study has shown that mevalonic acid kinase is present in most higher plants and the algae ...19676042361
the cell wall of rickettsia mooseri. i. morphology and chemical composition.cell walls prepared by mechanically disrupting intact rickettsia mooseri (r. typhi) were examined in an electron microscope and analyzed chemically. electron micrographs of metal-shadowed and negatively stained rickettsial cell walls revealed no significant differences, except for smaller size, from bacterial cell walls prepared in a similar manner. the chemical composition was complex, and resembled that of gram-negative bacterial cell walls more closely than that of gram-positive bacterial cel ...19676025416
[effect of light on growth and nitrogen fixation by soil blue-green algae]. 19666002933
decarboxylation performed by particulate fractions of two nitrogen-fixing blue-green algae. 19665971862
the relationship of the hill reaction to photosynthesis: studies with fluoride-poisoned blue-green algae. 19665961833
respiratory chain of colorless algae. ii. cyanophyta.whole cell difference spectra of the blue-green algae, saprospira grandis, leucothrix mucor, and vitreoscilla sp. have one, or at the most 2, broad alpha-bands near 560 mmu. at -190 degrees these bands split to give 4 peaks in the alpha-region for b and c-type cytochromes, but no alpha-band for a-type cytochromes is visible. the nadh oxidase activity of these organisms was shown to be associated with particulate fractions of cell homogenates. the response of this activity to inhibitors differed ...19665932404
urease activity in blue-green algae.the apparent enzymatic hydrolysis of urea has been detected in whole blue-green algae and in cell extracts. urease is present as an intracellullar component in cultures in which no bacterial contaminants are found. the activity in the cells was recovered from the extracts.19665931453
the blue-green algae. 19665930598
on the nitrogen fixation by egyptian blue green algae. 19635889156
[comparative study of nitrogen-fixing blue-green algae isolated from various soils of the ussr]. 19655887026
[changes in the composition and pigment content of blue-green algae in the presence of additional carbon and nitrogen sources]. 19655887024
[algicidal properties of aquatic and shore plants of the kremenchug reservoir with respect to the blue-green algae microcystis pulverea and anabaena hassalii]. 19655869328
photoassimilation of organic compounds by autotrophic blue-green algae. 19655867564
light-induced rapid absorption changes during photosynthesis. vi. complex reactions in some blue-green algae. 19655867545
[amino acid composition of the blue-green algae phormidium uncinatum (ag) gom]. 19655865402
[changes in the composition and content of pigments in blue-green algae in relation to the spectral composition of light and of the illumination degree]. 19655865393
[blue-green algae fixing nitrogen and their practical use. i. current views on the problems of nitrogen fixation by blue-green algae]. 19655859921
the lipid metabolism of blue-green algae. 19655856800
[influence of irradiated nitrogen on the nitrogen fixation of blue-green algae]. 19655848610
aldolase in blue-green algae. 19655830153
effect of desaspidin and dcmu on photokinesis of blue-green algae. 19695816767
fatty acids in the lipids of marine and terrestrial nitrifying bacteria.fatty acids in the lipids of 19 marine and terrestrial nitrifying bacteria have been analyzed. ammonia-oxidizing bacteria have a very simple acid composition; palmitic and palmitoleic acid account for 96 to 100% of the total acids. the fatty acids of nitrite-oxidizing bacteria cover a wider range, from c(14) to c(19), but from two to four acids still account for more than 80% of the total acids. branched iso- and anteiso-acids are present in traces only in 2 of the 19 bacteria. the chemical and ...19695808068
fatty acids and polar lipids of extremely thermophilic filamentous bacterial masses from two yellowstone hot springs.the fatty acid composition of filamentous bacterial masses from two very hot yellowstone park springs is not unusual despite the extreme environment. both populations have a series of c(14) to c(20) straight-chain acids with a maximum at c(18), and a series of saturated iso acids with a maximum at c(17) in one case and c(19) in the other. the fatty acid pattern of this anomalous group of organisms is like that of bacteria but not of blue-green algae. both populations have similar polar lipids an ...19695784208
phycovirus sm-1: a virus infecting unicellular blue-green algae. 19695777559
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 ...19695776533
uptake of glycine by blue-green algae. 19695771167
shear-oriented microfibrils in the mucilaginous investments of two motile oscillatoriacean blue-green algae.trichomes of two oscillatoriacean blue-green algae execute screw-like gliding motion, but the two organisms differ from each other with respect to the screw sense of motion. electron microscopy of serial longitudinal sections reveals extracellular microfibrils which lie roughly parallel to stream-lines at the surface of each organism. the author proposes that the microfibrils are oriented by shear in a zone just external to the outer unit membrane-like component of the cell wall.19695764337
[growth of nitrogen-fixing blue-green algae in the presence of fixed nitrogen]. 19685734415
[study of the carbohydrate components of cells of some blue-green algae]. 19685733583
ultrastructure of the cell wall and cell division of unicellular blue-green algae.the fine structure of the cell wall and the process of cell division were examined in thin sections of two unicellular blue-green algae grown under defined conditions. unilateral invagination of the photosynthetic lamellae is the first sign of cell division in the rod-shaped organism, anacystis nidulans. symmetrical invagination of the cytoplasmic membrane and inner wall layers follows. one wall layer, which appears to be the mucopolymer layer, is then differentially synthesized to form the sept ...19685732513
[on the role of oxygen content on the activity of some blue-green algae]. 19685732067
production of axemic cultures of soil-borne and endophytic blue-green algae. 19685729617
nitrogen-fixing blue-green algae in acid forest and nursery soils. 19685724886
acetylene reduction by nitrogen-fixing blue-green algae. 19685709637
toxic blue-green algae in saskatchewan. 19685693281
[nitrogen-containing compounds of some blue-green algae]. 19685662669
molecular diversity of the ribulose-1,5-diphosphate carboxylase from photosynthetic microorganisms.the ribulose-1,5-diphosphate carboxylases from green and blue-green algae and the purple sulfur photosynthetic bacterium chromatium are proteins with high molecular weights and with sedimentation coefficients of 18 to 21 svedberg units. the carboxylases of the athiorhodaceae are smaller, that of rhodospirillum rubrum being a 6.2s molecule, and those of the two species of rhodopseudomonas are 12s and 14.5s.19685659689
precambrian marine environment and the development of life.the tropical thermocline must have existed since the ocean's depth exceeded 300 meters. the density gradient in this layer concentrated organic aggregates formed abiologically near the surface of the sea, and the low rates of diflusion across this layer permitted the accumulation of oxygen once the layer was populated by blue-green algae; thus the evolution of eukaryotes became possible within the layer. because of rapid mixing over the shelves, the eukaryotes were restricted initially to the th ...19685657061
the isolation and identification of two sterols from two species of blue-green algae. 19685653697
selective isolation of blue-green algae from water and soil. 19685652096
growth and division of some unicellular blue-green algae. 19685652095
comparison of blue-green algae virus lpp-1 and the morphologically related viruses g-3 and coliphage t7. 19685650701
studies on the structure of blue-green algae virus lpp-1. 19685650700
choline and inositol distribution in algae and fungi.inositol and choline were present in varying amounts among the species of rhodophyta, phaeophyta, chlorophyta, and euglenophyta examined. however, in the two members of the order fucales (division phaeophyta) examined, no detectable amounts of choline were found. in contrast, the species of cyanophyta examined contained no detectable amounts of either choline or inositol. all species of the fungal classes phycomyceteae, ascomyceteae, and basidiomyceteae collected contained both inositol and chol ...19685647522
fatty acids in blue-green algae: possible relation to phylogenetic position.analyses of the lipids in five species of blue-green algae show that the fatty acids are largely the c(16) and c(18) acids. the only alga that could be grown heterotrophically, chlorogloea, formed the triply unsaturated c(18) acid in the light but only the doubly unsaturated c(18) acid in the dark. examination of these results and the results of others suggest that, except for one species, the more highly unsaturated acids are found in the morphologically more complex algae. the fatty acid compo ...19685644061
c-phycocyanin and allophycocyanin in two species of blue-green algae.1. the biliproteins c-phycocyanin and allophycocyanin were purified from the blue-green alga anabaena variabilis by ammonium sulphate fractionation and gel filtration. 2. an assay procedure that enabled the proportion of the two pigments, present as a mixture, to be determined was devised by using the data provided by spectrophotometric analysis of the purified biliproteins. 3. the degree of association and relative proportions of the two pigments were analysed by the application of this procedu ...19685637347
[a study of the carbohydrate content in the cells of some nitrogen-fixing blue-green algae]. 19675618105
[nitrogen-fixing ability of some blue-green algae]. 19675618084
[fine structure of parachromatophores in blue-green algae, anacystis nidulans r]. 19675611660
[on the chemical composition of some blue-green algae]. 19675609777
chloroplast structure of the cryptophyceae. evidence for phycobiliproteins within intrathylakoidal spaces.selective extraction and morphological evidence indicate that the phycobiliproteins in three cryptophyceaen algae (chroomonas, rhodomonas, and cryptomonas) are contained within intrathylakoidal spaces and are not on the stromal side of the lamellae as in the red and blue-green algae. furthermore, no discrete phycobilisome-type aggregates have thus far been observed in the cryptophyceae. structurally, although not necessarily functionally, this is a radical difference. the width of the intrathyla ...19715543400
absorption and fluorescence of chlorophyll a in particle fractions from different plants.density-gradient centrifugation of disintegrated cells from a variety of plants gave two kinds of chlorophyll particles from all except the blue-green algae. as in previous procedures using detergents, the lighter fraction 1 particles usually had greater absorption at longer wavelengths; they always had a lower ratio of short to long wavelength fluorescence at low temperature, and a lower fluorescence yield per chlorophyll than the denser fraction 2 particles. although only one kind of particle ...19695352230
a new method for obtaining bacteria-free cultures of blue-green algae. 19685300489
[viruses lysing blue-green algae]. 19715005590
growth response of blue-green algae to aldrin, dieldrin, endrin and their metabolites. 19715005176
[cellular and extracellular lipids of nitrogen-fixating blue-green algae and chlorellae]. 19715005138
[quantity and distribution of microbes in the basin of the dnieper falls dependent on the intensity of the growth of blue-green algae]. 19715005137
heterotrophy and nitrogen fixation in several blue-green algae from soil. 19715004584
action of nalidixic acid and hydroxyurea on two blue-green algae. 19715003889
the methyl viologen-catalyzed mehler reaction and catalase activity in blue-green algae and chlamydomonas reinhardi. 19715003698
propionate resistance in blue-green algae. 19715003469
uniformity of thylakoid structure in a red, a brown, and two blue-green algae. 19715002784
[oxygen consumption by obligate phototrophic blue-green algae in dark-adapted conditions and following illumination]. 19715002170
the involvement of lecithin and monogalactosyl diglyceride in linoleate synthesis by green and blue-green algae. 19715002151
content of -tocopherol in some blue-green algae. 19715000879
survival of blue-green algae under primitive atmospheric conditions. 19715000639
purification and properties of unicellular blue-green algae (order chroococcales). 19714998365
apparent lack of control by repression of arginine metabolism in blue-green algae.five anabolic and two catabolic enzymes of arginine metabolism were neither repressed nor induced after inclusion of arginine in the growth medium of anabaena variabilis.19714998248
[cobalt requirement in some nitrogen-fixing blue-green algae]. 19714997858
light-induced shifts in pigment absorption in green, red and blue-green algae. 19714997844
subunit structure of the phycobiliproteins of blue-green algae.the phycobiliproteins of the blue-green algae synechococcus sp. and aphanocapsu sp. were characterized with respect to homogeneity, isoelectric point, and subunit composition. each of the biliproteins consisted of two different noncovalently associated subunits, with molecular weights of about 20,000 and 16,000 for phycocyanin, 17,500 and 15,500 for allophycocyanin, and 22,000 and 20,000 for phycoerythrin. covalently bound chromophore was associated with each subunit.19714997755
[isolation and characteristic propertyies of dna of the blue-green algae anacystic nidulans]. 19714997702
[effect of blue-green algae on growth of rice seedlings]. 19714997180
[nitrogen-fixing ability of blue-green algae in paddy fields in the south of the ukrainian ssr]. 19704996785
nitrogen fixation by unicellular blue-green algae. 19714996394
[biosynthesis of biotin, pyridoxine, nicotinic and pantothenic acids by some blue-green algae]. 19704996242
a new photosynthetic pigment, "p430": its possible role as the priary electron acceptor of photosystem i.the technique of flash kinetic spectrophotometry was used to demonstrate a broad absorption band around 430 nm, which was kinetically different from p700, in several photosystem-i particles from spinach and blue-green algae. the component represented by this absorption band, designated as "p430", was bleached as fast as p700. its recovery in the dark was accelerated by ferredoxin and by various artificial electron acceptors with redox potentials as low as -521 mv. the recovery kinetics have been ...19714995817
growth responses of blue-green algae to sodium chloride concentration. 19714994861
endogenous dark respiration of the blue-green alga, plectonema boryanum.endogenous dark respiration in the blue-green alga plectonema boryanum is markedly affected by preincubation in the light: it can be increased from a basal rate of 5 nmoles of o(2) to 55 nmoles of o(2) per mg of cell protein per min after exposure of the cells to light for 8 to 10 hr. under conditions of enhanced dark respiration, cyanophage multiplication in the dark increases drastically and approaches the cyanophage yields obtained in photosynthesizing plectonema cells. this implies that the ...19714994602
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