Reference Type: Journal Article Record Number: 113 Author
Notes: FLA 00129658 Duke University Press EN Copyright 1978 The Ecological Society of America URL
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Notes: FLA 00129658
Duke University Press EN Copyright 1978 The Ecological Society of America URL: http://links.jstor.org/sici?sici=0012-9658%28197801%2959%3A1%3C19%3AHDATHD%3E2.0.CO%3B2-1 Reference Type: Journal Article Record Number: 91 Author: Tel-Or, E.; Stewart, W. D. P. Year: 1977 Title: Photosynthetic Components and Activities of Nitrogen-Fixing Isolated Heterocysts of Anabaena cylindrica Journal: Proceedings of the Royal Society of London. Series B, Biological Sciences Volume: 198 Issue: 1130 Pages: 61-86 Date: May 19 Abstract: Isolated heterocysts of the N$_{2}$-fixing Anabaena cylindrica, prepared by a combination of lysozyme and Yeda press treatments, are metabolically active with over 90% of the measurable nitrogenase activity being located in the heterocyst preparations after disruption of the intact filaments. The photosynthetic activities of such isolated heterocysts are characterized by an inability to carry out the photolysis of water or to fix CO$_{2}$. The lack of O$_{2}$ evolution appears to be due in part to the depletion during heterocyst differentiation of Mn, a central component of the photosystem II reaction centre in O$_{2}$-evolving algae. There is evidence that components of the photosynthetic electron transport chain on the reducing side of the photosystem II reaction centre are present and functional in heterocysts. These include cytochrome c$_{554}$, plastocyanin, plastoquinone, cytochrome b$_{559}$, P700, cytochrome b$_{563}$, and iron-sulphur proteins which appear to correspond to centre A and centre B of higher plant chloroplasts. Soluble, or loosely bound ferredoxin is also present and involved in electron transport from ferredoxin to NADP. Isolated heterocysts photoreduce methylviologen when reduced 2,6-dichlorophenolindophenol and diphenylcarbazide serve as electron donors. They show P700 photo-oxidation and photoreduction, photosynthetic electron transport which is inhibited by 2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone an antagonist of plastoquinone, photophosphorylation, oxidative phosphorylation and ferredoxin-NADP oxidoreductase mediated reactions. The photosynthetic modifications of the heterocyst are such that electron transport and the generation of ATP for nitrogenase can occur without concomitant O$_{2}$ evolution and without nitrogenase having to compete with CO$_{2}$ fixation for ATP and reductant. Notes: FLA 00804649
The Royal Society latex
Copyright 1977 The Royal Society URL: http://links.jstor.org/sici?sici=0080-4649%2819770519%29198%3A1130%3C61%3APCAAON%3E2.0.CO%3B2-9 Reference Type: Journal Article Record Number: 255 Author: Sinclair, C.; Whitton, B. A. Year: 1977 Title: Influence of nutrient deficiency on hair formation in the Rivulariaceae Journal: Br. Phycol. J., 12(3), 297-313, 1977 Keywords: nutrient deficiency; environmental effects; Rivulariaceae Anabaena; Calothrix; Dichothrix; Gloeotrichia; Homoeothrix; Rivularia; hair; formation; nutrition; deficiency; effect of; effect on Marine
Q1 01422 Environmental effects Abstract: Thirteen out of 36 strains of Rivulariaceae (including species of Anabaena, Calothrix, Dichothrix, Gloeotrichia, Homoeothrix, Rivularia) were found to be able to produce hairs. In all 13 strains, abundant hair increase occurred under conditions of phosphate deficiency. Fe deficiency also led to hair formation in 8 strains, and Mg deficiency in one strain, but Ca, Mo and SO SUB-4 deficiences had no such effect. Although the presence of combined nitrogen had a marked effect on the trichome morphology of the heterocystous strains, it reduced hair formation in only 3 strains, and the effect was only slight. Addition of the missing element to deficient cultures with hairs always eventually led to the loss of the hair. Two field materials were also studied, in crude culture. Both showed increased hair development with decreasing phosphate concentration. Notes: English Journal Article Reference Type: Journal Article Record Number: 24 Author: Rother, J. A.; Fay, P. Year: 1977 Title: Sporulation and the Development of Planktonic Blue-Green Algae in Two Salopian Meres Journal: Proceedings of the Royal Society of London. Series B, Biological Sciences Volume: 196 Issue: 1124 Pages: 317-332 Date: Mar. 18 Abstract: Factors affecting akinete formation and the survival of planktonic blue-green algal populations after the formation of 'water blooms' were investigated in two eutrophic kataglacial lakes. It is considered that the induction of sporulation may be due to extreme conditions at the water surface during the summer to which the algal bloom is exposed, rather than to nutrient, especially orthophosphate, deficiency. It has not been shown conclusively that akinetes constitute an overwintering stage of the planktonic algal life cycle, or that akinetes germinate in the spring to produce the inoculum for subsequent vegetative growth. Comparisons of planktonic, sedimenting and benthic algal material indicate that germination shortly after maturation may provide the greater part of the over-wintering planktonic vegetative populations. Population sizes and life cycles appear to be influenced by the physical factors which control the stability of the water column. Notes: FLA 00804649
The Royal Society Copyright 1977 The Royal Society URL: http://links.jstor.org/sici?sici=0080-4649%2819770318%29196%3A1124%3C317%3ASATDOP%3E2.0.CO%3B2-F Reference Type: Journal Article Record Number: 256 Author: Islam, A. K. M. Nurul; Mendes, Francis Year: 1977 Title: Studies on the proteins in blue-green algae of Bangladesh. II. Extractible proteins Journal: Dacca University Studies Volume: 25 Issue: 2 Pages: 51-4 Accession Number: AN 1978:486869 Keywords: Proteins Role: BIOL (Biological study) (of cyanobacteria, ext. of); Aulosira aenigmatica; Cyanobacteria; Gloeotrichia natans; Lyngbya majuscula; Nostoc; Oscillatoria limosa; Porphyrosiphon notarisii; Wollea (proteins of, extn. of) protein extn blue green algae; cyanobacteria protein extn Abstract: The crude protein content extd. from Aulosira aenigmatica, Wollea species, and Gloeotrichia natans constituted 37.63, 35.0, and 20.13%, resp. Of various solvents tested for extg. proteins from 7 species of blue-green algae, 0.5 NaOH, 1.0 NaCl, and 1.0% Na2CO3 were the most effective. [on SciFinder (R)] Notes: CAN 89:86869 10-1
Microbial Biochemistry Dep. Bot.,Univ. Dacca,Dacca,Bangladesh. Journal 0011-5223 written in English. 497-19-8; 1310-73-2; 7647-14-5 Role: BIOL (Biological study) (proteins of cyanobacteria extn. by) Reference Type: Journal Article Record Number: 92 Author: Duckett, J. G.; Prasad, A. K. S. K.; Davies, D. A.; Walker, S. Year: 1977 Title: A Cytological Analysis of the Nostoc-Bryophyte Relationship Journal: New Phytologist Volume: 79 Issue: 2 Pages: 349-362 Date: Sep. Abstract: A comparative light and electron microscope study has been made of the Nostoc colonies within the thalli of Blasia pusilla and the three British species of Anthoceros, and also of the Nostoc isolated from each bryophyte. From their morphology in culture two taxa of Nostoc have been identified; N. sphaericum from Anthoceros punctatus, A. husnotii and A. laevis, and N. calcicola from other gatherings of Anthoceros laevis and Blasia. These findings support the notion that the algal-bryophyte associations are none specific. Within bryophyte thalli, the Nostoc trichomes are closely packed and specific features cannot be recognized. Mucilaginous sheaths are much less extensive and there is no evidence that the alga thrive in mucilage produced by the adjacent bryophyte cells. Heterocyst frequencies as high as 50% in the bryophytic Nostoc spp. strikingly recall the Azolla, Gunnera and cycad-blue-green algal symbioses. Akinetes, readily produced in culture were only seen in the Nostoc from dormant Anthoceros. The absence of phycobilisomes and high heterocyst frequencies in the bryophytic Nostoc spp. corroborates physiological data that the algae receive organic carbon from their hosts which enable them to fix nitrogen heterotrophically. The Nostoc colonies in both Blasia and Anthoceros are extensively penetrated by multicellular bryophytic filaments. Whereas in Anthoceros these comprise highly vacuolate, thin-walled cells, which sometimes contain intracellular Nostoc trichomes, in Blasia the filaments are thick-walled and often develop labyrinthine wall ingrowths. This transfer cell morphology may be interpreted as an adaptation facilitating interchange of metabolites between Blasia and Nostoc. Its absence in Anthoceros perhaps indicates a far less harmonious relationship or may be related to the higher nutrient status of the habitats where the Anthoceros spp. were collected. Notes: FLA 0028646x
Blackwell Science Publications Copyright 1977 New Phytologist Trust URL: http://links.jstor.org/sici?sici=0028-646X%28197709%2979%3A2%3C349%3AACAOTN%3E2.0.CO%3B2-9 Reference Type: Book Record Number: 257 Author: Crisman, T. L. Year: 1977 Title: Algal remains in Minnesota lake types: A correlation of modern and early postglacial distributions Series Editor: Blinova, E. I.; Vozzhinskaya, V. B.; Rekhina, N. I.; Kosova, K. D. City: 3 Knabrostraede, DK-1210, Copenhagen K, Denmark Publisher: DIS Congress Service Keywords: geographical distribution; environmental effects; Algae; USA, Minnesota, Inland waters palaeontology Freshwater Q1 01222 Geographical distribution
S.I.L. 20 Congress Copenhagen English Book Monograph Reference Type: Journal Article Record Number: 258 Author: Crawford, S. A. Year: 1977 Title: Chemical, physical and biological changes associated with Chara succession in farm ponds Journal: Hydrobiologia Volume: 55 Issue: 3 Pages: 209-217 Keywords: succession (ecological); water analysis; ponds; Chara vulgaris pond; succession; nutrients (mineral); chemical analysis Freshwater Q1 01482 Ecosystems and energetics Abstract: Four farm ponds in various stages of Chara vulgaris succession - from the initial invasion of the alga to its nearly complete replacement - were followed each week from ice cover to ice cover. Chemical, physical, and biological parameters were analyzed in order to determine differences between ponds and to discover the biological and physicochemical factors associated with succession in C.vulgaris ponds. The data were analyzed statistically by intraclass (single factor) analysis of variance, the Student's t-test, and stepwise multiple regression analysis. The initial invasion of C.vulgaris appeared to be preceded by a lowering of the nutrient levels of the pond by Zygnematales growth and by the substrate-stabilizing growth of Rhizoclonium sp. Chara-dominated ponds had significantly lower free CO SUB-2 , bicarbonate alkalinity, and total hardness readings. Carbonate alkalinity, low phytoplankton productivity, high dissolved O SUB-2 , low phosphate, and high Secchi disk readings were also characteristic of ponds in which C.vulgaris was dominant. In ponds where C.vulgaris appeared in the process of being replaced, the physicochemical factors were more closely associated with phytoplankton productivity and diversity and less closely with submerged vegetation species. Succession from C.vulgaris domination to a Najas-Potamogeton community appeared to involve shading of the former by the latter and was accelerated by the smothering effect of decaying debris caused by Gloeotrichia sp. In the final stages of succession, turbid conditions resulting from the lack of substrate-stabilizing vegetation and increased phytoplankton growth appear to have discouraged C.vulgaris growth early in the season. Notes: English Journal Article Reference Type: Journal Article Record Number: 33 Author: Torrey, Marguerite Sherman; Lee, G. F. Year: 1976 Title: Nitrogen Fixation in Lake Mendota, Madison, Wisconsin Journal: Limnology and Oceanography Volume: 21 Issue: 3 Pages: 365-378 Date: May Abstract: The effects of various environmental conditions, and of cell composition, heterocyst content, and nitrogen content of algal samples, on fixation of $N_2$ by colonial and filamentous algae in Lake Mendota were investigated. Heterocyst content and temperature were significantly and positively related to acetylene reduction activity ($N_2$ fixation); depth of sample collection was negatively related. Available data do not show whether statistical correlations of acetylene reduction activity with disolved $O_2$ and pH represent specific effects of $O_2$ and pH on this activity, or simply reflect chemical changes caused by algal photosynthesis. During summer stratification, when surface-water content of combined inorganic nitrogen was severely depleted, $N_2$ fixation associated with heterocystous blue-green algae contributed 85% of the total $N_2$ fixed. Bacterial $N_2$ fixation was low compared to that of algae. Despite its small overall contribution to the annual nitrogen budget (38,000 kg of nitrogen; ca. 7% of the total input), $N_2$ fixation is significant in maintaining blue-green algal nuisances in surface water when $non-N_2 -fixing$ phytoplankton cannot compete effectively. Notes: FLA 00243590
American Society of Limnology and Oceanography latex
Copyright 1976 American Society of Limnology and Oceanography URL: http://links.jstor.org/sici?sici=0024-3590%28197605%2921%3A3%3C365%3ANFILMM%3E2.0.CO%3B2-3 Reference Type: Journal Article Record Number: 259 Author: Stewart, K. M. Year: 1976 Title: Oxygen deficits, clarity, and eutrophication in some Madison lakes Journal: Int. Rev. Gesamt. Hydrobiol Volume: 61 Issue: 5 Pages: 563-579 Accession Number: 5260457 Keywords: Eutrophication; Trophic levels; Oxygen depletion; Phytoplankton; Seasonal variations; Water temperature; Hypolimnion; Water quality; Sewage; Daphnia pulex; Aphanizomenon flos-aquae; Microcystis aeruginosa; Anabaena; Staurastrum; Melosira; Ceratium; Gloeotrichia; USA, Wisconsin, Madison; USA, Wisconsin, Mendota L; USA, Wisconsin, Waubesa L; USA, Wisconsin, Monona L Freshwater Q1 01482 Ecosystems and energetics; Q1 01481 Productivity Abstract: Oxygen deficits, rates of oxygen depletion, and Secchi disk measurements were the major indices examined in this study to determine trends in trophic conditions in Lakes Mendota, Monona, and Waubesa near Madison, Wisconsin. On the basis of available data, there is little that can be said reliably with respect to documenting eutrophication, particularly in Lake Mendota in the past several decades, that could not be attributed to normal variability. Better evidence for eutrophication comes from cores of some of the lakes. A comparison of oxygen deficits without simultaneous information on mean hypolimnetic temps and the lateness of ice out may provide a misleading interpretation of trophic variations over time. Notes: 1976. 0020-9309 59 ref.. Records keyed from 1977 ASFA printed journals. English
Journal Article Author Address: State Univ.New York, Dep.Biol., Buffalo, NY 14214, USA Reference Type: Journal Article Record Number: 260 Author: Peterson, R. B.; Burris, R. H. Year: 1976 Title: Conversion of acetylene reduction rates to nitrogen fixation rates in natural populations of blue-green algae Journal: Analytical Biochemistry Volume: 73 Issue: 2 Pages: 404-10 Accession Number: AN 1976:443320 Keywords: Anabaena; Aphanizomenon; Gloeotrichia (acetylene redn. rates and nitrogen fixation in); Algae (blue-green, nitrogen fixation in, acetylene redn. in relation to); Nitrogen fixation (by blue-green algae, acetylene redn. rates in relation to) blue green algae nitrogen fixation; acetylene redn nitrogen fixation algae Abstract: The results of 12 expts. are reported on naturally occurring groups of N2-fixing blue-green algae in which redn. of C2H2 and 15N2 were detd. simultaneously. Simple averaging of the C2H2/N2 redn. rates yielded a conversion factor of 4.4. Linear and log transform regression analyses yielded values of 4.8 and 4.2, resp. Reports estg. N inputs based on C2H2 redn. detns. are evaluated. [on SciFinder (R)] Notes: CAN 85:43320 9-5
Biochemical Methods Dep. Biochem.,Univ. Wisconsin,Madison,WI,USA. Journal 0003-2697 written in English. Reference Type: Journal Article Record Number: 89 Author: Moss, Brian Year: 1976 Title: The Effects of Fertilization and Fish on Community Structure and Biomass of Aquatic Macrophytes and Epiphytic Algal Populations: An Ecosystem Experiment Journal: The Journal of Ecology Volume: 64 Issue: 1 Pages: 313-342 Date: Mar. Abstract: Eighteen similar ponds (0.07 ha area, 1.3 m water depth) were fertilized at three levels with a fertilizer containing nitrogen, phosphorus and potassium compounds. Two ponds were left as controls. Simultaneously similar blue gill sunfish (Lepomis macrochirus) populations were added to nine of the ponds. The effects of fertilization and the presence of fish which eat invertebrates, including grazers on the aquatic macrophyte and epiphytic algal populations, were investigated. Medium fertilization $(0.23 g N m^{-2} week^{-1}, 0.02 g P m^{-2} week^{-1})$ did not change the macrophyte biomass or species composition, or the biomass and species composition of the epiphyte community. Its sole effect was to increase diversity of the epiphytic diatom community slightly. There was no apparent influence of fish at low and medium fertilization levels. High levels of fertilization $(0.91 g N m^{-2} week^{-1}, 0.09 g P m^{-2} week^{-1}$) caused major changes in the limnology of the ponds, in the macrophyte community composition and biomass, in the epiphyte biomass and diatom community composition and diversity. Some of the reasons for change in the diatom community could be directly ascribed to fertilization and some to a change in the nature of the host macrophyte. There was a reduction in biomass at high fertilization levels which was believed to be due to shading by increased phytoplankton populations. Fish had measurable influence at high fertilization levels. They caused increases in biomass of certain macrophytes and of the epiphytes, probably through predation on grazing invertebrates, and they changed slightly the species composition of the epiphytic diatom community, perhaps because of modification of water chemistry, perhaps because of predation on grazers which ate the epiphytes selectively. Overall the effects of fertilization on the macrophyte-epiphyte community were much greater than those of the presence of fish. A quantitative summary is given in Fig. 9. Some comments are made on the advantages and drawbacks of large-scale ecosystem experimentation. Notes: FLA 00220477
Blackwell Scientific Publications latex
Copyright 1976 British Ecological Society URL: http://links.jstor.org/sici?sici=0022-0477%28197603%2964%3A1%3C313%3ATEOFAF%3E2.0.CO%3B2-X Reference Type: Journal Article Record Number: 261 Author: H.-Bartha, Z. Year: 1976 Title: On the occurrence of two blue-green algae in Lake Balaton Journal: Ann. Inst. Biol. Sci. Hung. (Tihany), 43, 43-46, (1976) Keywords: new records; geographical distribution; taxonomy; morphology (organisms); Gloeotrichia natans; Anabaena flos-aquae; Hungary, Balaton L. habitat; Stratiotes aloides; occurrence; lake; Balaton; Hungary Freshwater Q1 01222 Geographical distribution
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