| nitrogenase activity in extracts of heterocystous and non-heterocystous blue-green algae. | | 1970 | 4992980 |
| [metabolically active spheroplasts of blue-green algae]. | | 1970 | 4993267 |
| electron spin resonance of chlorophyll and the origin of signal i in photosynthesis. | a comparison has been made between signal i, the photo-electron spin resonance signal associated with the primary light conversion act in photosynthesis, and free-radical signals generated in various chlorophyll species in vitro. the esr signals obtained from chlorophyll.monomer, (chl.l)(+.), chlorophyll dimer, (chl(2))(+.), and chlorophyll oligomer, (chl(2))(n) (+.), are broader than signal i, whereas the chlorophyll-water adduct, (chl.h(2)o)(n) (+.), gives a signal very much narrower than sign ... | 1971 | 4993385 |
| [effect of nitrogen-fixing blue-green algae on crop plants]. | | 1969 | 4993451 |
| gas vacuoles. light shielding in blue-green algae. | | 1971 | 4993483 |
| [biosynthesis of thiamine, riboflavin and vitamin b12 by some blue-green algae]. | | 1970 | 4993968 |
| heterotrophic growth of blue-gren algae in dim light. | a unicellular blue-green alga, agmenellum quadruplicatum, and a filamentous blue-green alga, lyngbya lagerheimíi, were grown heterotrophically in dim light with glucose as major source of carbon and possibly energy. the dim-light conditions did not support autotrophic growth. the two blue-green algae appeared to have the same metabolic block, namely an incomplete tricarboxylic acid cycle, as has been found in other obligately phototrophic blue-green algae. under dim-light conditions, glucose mad ... | 1971 | 4994034 |
| 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 ... | 1971 | 4994602 |
| growth responses of blue-green algae to sodium chloride concentration. | | 1971 | 4994861 |
| 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 ... | 1971 | 4995817 |
| [biosynthesis of biotin, pyridoxine, nicotinic and pantothenic acids by some blue-green algae]. | | 1970 | 4996242 |
| nitrogen fixation by unicellular blue-green algae. | | 1971 | 4996394 |
| [nitrogen-fixing ability of blue-green algae in paddy fields in the south of the ukrainian ssr]. | | 1970 | 4996785 |
| [effect of blue-green algae on growth of rice seedlings]. | | 1971 | 4997180 |
| [isolation and characteristic propertyies of dna of the blue-green algae anacystic nidulans]. | | 1971 | 4997702 |
| 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. | 1971 | 4997755 |
| light-induced shifts in pigment absorption in green, red and blue-green algae. | | 1971 | 4997844 |
| [cobalt requirement in some nitrogen-fixing blue-green algae]. | | 1971 | 4997858 |
| 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. | 1971 | 4998248 |
| purification and properties of unicellular blue-green algae (order chroococcales). | | 1971 | 4998365 |
| survival of blue-green algae under primitive atmospheric conditions. | | 1971 | 5000639 |
| content of -tocopherol in some blue-green algae. | | 1971 | 5000879 |
| the involvement of lecithin and monogalactosyl diglyceride in linoleate synthesis by green and blue-green algae. | | 1971 | 5002151 |
| [oxygen consumption by obligate phototrophic blue-green algae in dark-adapted conditions and following illumination]. | | 1971 | 5002170 |
| uniformity of thylakoid structure in a red, a brown, and two blue-green algae. | | 1971 | 5002784 |
| propionate resistance in blue-green algae. | | 1971 | 5003469 |
| the methyl viologen-catalyzed mehler reaction and catalase activity in blue-green algae and chlamydomonas reinhardi. | | 1971 | 5003698 |
| action of nalidixic acid and hydroxyurea on two blue-green algae. | | 1971 | 5003889 |
| heterotrophy and nitrogen fixation in several blue-green algae from soil. | | 1971 | 5004584 |
| [quantity and distribution of microbes in the basin of the dnieper falls dependent on the intensity of the growth of blue-green algae]. | | 1971 | 5005137 |
| [cellular and extracellular lipids of nitrogen-fixating blue-green algae and chlorellae]. | | 1971 | 5005138 |
| growth response of blue-green algae to aldrin, dieldrin, endrin and their metabolites. | | 1971 | 5005176 |
| [viruses lysing blue-green algae]. | | 1971 | 5005590 |
| a new method for obtaining bacteria-free cultures of blue-green algae. | | 1968 | 5300489 |
| 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 ... | 1969 | 5352230 |
| 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 ... | 1971 | 5543400 |
| [on the chemical composition of some blue-green algae]. | | 1967 | 5609777 |
| [fine structure of parachromatophores in blue-green algae, anacystis nidulans r]. | | 1967 | 5611660 |
| [nitrogen-fixing ability of some blue-green algae]. | | 1967 | 5618084 |
| [a study of the carbohydrate content in the cells of some nitrogen-fixing blue-green algae]. | | 1967 | 5618105 |
| 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 ... | 1968 | 5637347 |
| 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 ... | 1968 | 5644061 |
| 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 ... | 1968 | 5647522 |
| studies on the structure of blue-green algae virus lpp-1. | | 1968 | 5650700 |
| comparison of blue-green algae virus lpp-1 and the morphologically related viruses g-3 and coliphage t7. | | 1968 | 5650701 |
| growth and division of some unicellular blue-green algae. | | 1968 | 5652095 |
| selective isolation of blue-green algae from water and soil. | | 1968 | 5652096 |
| the isolation and identification of two sterols from two species of blue-green algae. | | 1968 | 5653697 |
| 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 ... | 1968 | 5657061 |
| 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. | 1968 | 5659689 |
| [nitrogen-containing compounds of some blue-green algae]. | | 1968 | 5662669 |
| toxic blue-green algae in saskatchewan. | | 1968 | 5693281 |
| acetylene reduction by nitrogen-fixing blue-green algae. | | 1968 | 5709637 |
| nitrogen-fixing blue-green algae in acid forest and nursery soils. | | 1968 | 5724886 |
| production of axemic cultures of soil-borne and endophytic blue-green algae. | | 1968 | 5729617 |
| [on the role of oxygen content on the activity of some blue-green algae]. | | 1968 | 5732067 |
| 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 ... | 1968 | 5732513 |
| [study of the carbohydrate components of cells of some blue-green algae]. | | 1968 | 5733583 |
| [growth of nitrogen-fixing blue-green algae in the presence of fixed nitrogen]. | | 1968 | 5734415 |
| 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. | 1969 | 5764337 |
| uptake of glycine by blue-green algae. | | 1969 | 5771167 |
| 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 |
| phycovirus sm-1: a virus infecting unicellular blue-green algae. | | 1969 | 5777559 |
| 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 ... | 1969 | 5784208 |
| 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 ... | 1969 | 5808068 |
| effect of desaspidin and dcmu on photokinesis of blue-green algae. | | 1969 | 5816767 |
| aldolase in blue-green algae. | | 1965 | 5830153 |
| [influence of irradiated nitrogen on the nitrogen fixation of blue-green algae]. | | 1965 | 5848610 |
| the lipid metabolism of blue-green algae. | | 1965 | 5856800 |
| [blue-green algae fixing nitrogen and their practical use. i. current views on the problems of nitrogen fixation by blue-green algae]. | | 1965 | 5859921 |
| [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]. | | 1965 | 5865393 |
| [amino acid composition of the blue-green algae phormidium uncinatum (ag) gom]. | | 1965 | 5865402 |
| light-induced rapid absorption changes during photosynthesis. vi. complex reactions in some blue-green algae. | | 1965 | 5867545 |
| photoassimilation of organic compounds by autotrophic blue-green algae. | | 1965 | 5867564 |
| [algicidal properties of aquatic and shore plants of the kremenchug reservoir with respect to the blue-green algae microcystis pulverea and anabaena hassalii]. | | 1965 | 5869328 |
| [changes in the composition and pigment content of blue-green algae in the presence of additional carbon and nitrogen sources]. | | 1965 | 5887024 |
| [comparative study of nitrogen-fixing blue-green algae isolated from various soils of the ussr]. | | 1965 | 5887026 |
| on the nitrogen fixation by egyptian blue green algae. | | 1963 | 5889156 |
| the blue-green algae. | | 1966 | 5930598 |
| 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. | 1966 | 5931453 |
| 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 ... | 1966 | 5932404 |
| the relationship of the hill reaction to photosynthesis: studies with fluoride-poisoned blue-green algae. | | 1966 | 5961833 |
| decarboxylation performed by particulate fractions of two nitrogen-fixing blue-green algae. | | 1966 | 5971862 |
| [effect of light on growth and nitrogen fixation by soil blue-green algae]. | | 1966 | 6002933 |
| 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 ... | 1967 | 6025416 |
| 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 ... | 1967 | 6042361 |
| the tocopherols of the blue-green algae. | | 1967 | 6048761 |
| effect of carbohydrates on the symbiotic growth of planktonic blue-green algae with bacteria. | | 1967 | 6052729 |
| the metabolism of acetate by the blue-green algae, anabaena variabilis and anacystis nidulans. | | 1967 | 6077932 |
| oxygen inhibition of nitrogen fixation in cell-free preparations of blue-green algae. | | 1967 | 6078112 |
| 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 ... | 1984 | 6152869 |
| 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 ... | 1981 | 6162854 |
| 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 ... | 1982 | 6215277 |
| [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 ... | 1981 | 6263373 |
| 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 ... | 1984 | 6327614 |
| apparent blue-green algae poisoning in swine subsequent to ingestion of a bloom dominated by anabaena spiroides. | | 1983 | 6403497 |
| freshwater cyanobacteria (blue-green algae) and human health. | | 1983 | 6405135 |
| 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 ... | 1983 | 6415937 |
| 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 ... | 1983 | 6416126 |
| 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 ... | 1983 | 6418731 |