Reference Type: Journal Article Record Number: 113 Author
Notes: English Journal Article Reference Type
Download 1.4 Mb.
|
Notes: English Journal Article Reference Type: Journal Article Record Number: 262 Author: Granhall, Ulf Year: 1976 Title: The presence of cellulose in heterocyst envelopes of blue-green algae and its role in relation to nitrogen fixation Journal: Physiologia Plantarum Volume: 38 Issue: 3 Pages: 208-16 Accession Number: AN 1977:13903 Keywords: Nitrogen fixation (by blue-green algae, cell wall cellulose in relation to); Cell wall (cellulose of, of blue-green algae, nitrogen fixation in relation to); Anabaena inaequalis; Gloeotrichia echinulata (nitrogen fixation by, cell wall cellulose in relation to); Algae (blue-green, nitrogen fixation by, cell wall cellulose in relation to) algae nitrogen fixation cellulose; cell wall cellulose algae; Anabaena nitrogen fixation cellulose; Gloeotrichia nitrogen fixation cellulose Abstract: The presence of cellulose in the heterocyst envelope of blue-green algae (Anabaena inaequalis and Gloeotrichia echinulata) was studied by electron microscopy, cellulase treatments, and sp. staining. The role of this cellulose in the protection of the heterocyst nitrogenase during acetylene redn. was obsd. Expts. with lysozyme and cellulase suggest that N fixation in heterocystous blue-green algae under aerobic conditions is functionally effective only when an intimate relation exists between vegetative cells and heterocysts and both cell types have intact wall structures. [on SciFinder (R)] Notes: CAN 86:13903 11-2
Plant Biochemistry Dep. Microbiol.,Swed. Univ. Agric., For. Vet. Med.,Uppsala,Swed. Journal 0031-9317 written in English. 9004-34-6 Role: BIOL (Biological study) (of algae cell walls, nitrogen fixation in relation to) Reference Type: Journal Article Record Number: 263 Author: Cranwell, P. A. Year: 1976 Title: Decomposition of aquatic biota and sediment formation: lipid components of two blue-green algal species and of detritus resulting from microbial attack Journal: Freshwater Biology Volume: 6 Issue: 6 Pages: 481-8 Accession Number: AN 1978:126063 Keywords: Lipids Role: OCCU (Occurrence) (in lake sediments, from microbial decompn. of blue-green algae); Gloeotrichia echinulata; Oscillatoria agardhii (in lake water, microbial decompn. of, lipids in sediments in relation to); Geological sediments (lake, lipids in, from microbial decompn. of blue-green algae) Gloeotrichia decompn lipid lake sediment; Oscillatoria decompn lipid lake sediment; algae decompn lipid lake sediment Abstract: To simulate early stages in the diagenesis of algal material in lakes, microbial attack was allowed to proceed on natural populations of 2 blue-green algal species, Gloeotrichia echinulata and Oscillatoria agardhii. Changes in compn. and abundance of the major lipid fractions were related to differences in the ease of microbial attack and to the effect of O on the decay process. The loss of labile unsatd. compds. during diagenesis is consistent with the small amt. of these compds. in most lake sediments. [on SciFinder (R)] Notes: CAN 88:126063 61-1
Water Freshwater Biol. Assoc.,Ambleside/Cumbria,UK. Journal 0046-5070 written in English. 7782-44-7 Role: OCCU (Occurrence) (in lake water, microbial decompn. of blue-green algae in relation to) Reference Type: Journal Article Record Number: 88 Author: Bousfield, Joan; Peat, Alan Year: 1976 Title: The Ultrastructure of Collema tenax, with Particular Reference to Microtubule-Like Inclusions and Vesicle Production by the Phycobiont Journal: New Phytologist Volume: 76 Issue: 1 Pages: 121-128 Date: Jan. Abstract: An ultrastructural study of the vegetative thallus of Collema tenax (SW). Ach, showed that although haustorial connections were absent, the mycobiont did occasionally penetrate the algal sheath material. Concentric bodies and mesosome-like structures were characteristically found in the mycobiont. Normal and senescent blue-green algal cells were found alongside unusual vesiculating cells. Vesicles from these latter cells are apparently produced by reverse pinocytosis of plastoglobuli. These vesicles were occasionally found in close juxtaposition to the fungal hyphae, after dissolution of the algal sheath, and the hypothesis is advanced that they may be implicated in lipid transfer. 'Microtubule-like' structures were observed in the algal cells and their relationship to similar structures in free living Nostoc, other blue-green algae, bacteria, algal and higher plant chloroplasts and to typical microtubules is discussed. The ultrastructure of fresh and rehydrated material was compared. There was no apparent difference in the ultrastructure of material which had been dried for 3 months and rehydrated and that of material which had been freshly fixed. Notes: FLA 0028646x
Blackwell Science Publications Copyright 1976 New Phytologist Trust URL: http://links.jstor.org/sici?sici=0028-646X%28197601%2976%3A1%3C121%3ATUOCTW%3E2.0.CO%3B2-F Reference Type: Journal Article Record Number: 90 Author: Birks, H. J. B. Year: 1976 Title: Late-Wisconsinan Vegetational History at Wolf Creek, Central Minnesota Journal: Ecological Monographs Volume: 46 Issue: 4 Pages: 395-429 Date: Autumn Keywords: Climatic history, ice margin, macrofossils, plant, Minnesota, Pleistocene, stratigraphy, pollen, vegetation, late Wisconsinan Abstract: The pollen and plant-macrofossil stratigraphy of Wolf Creek, an extensive marsh within one of the oldest drumlin fields in central Minnesota, is described for the period 20,500 to 9150 yr ago. The pollen stratigraphy is presented both as percentages and as @'absolute@' influx. Both the pollen and macrofossil data have been analyzed by numerical zonation procedures to reveal the major stratigraphic patterns with the two data sets. The vegetational reconstructions presented are based on the pollen percentage and influx data, on macrofossil assemblages, on comparisons of modern and fossil pollen spectra, and on the present ecology of the individual taxa concerned. From 20,500 to 14,700 yr ago, a mosaic of tundra-like vegetation prevailed, with wide-spread @'tundra-barrens@' of Dryas integrifolia, Arenaria rubella, Silene acaulis, and Vaccinium uliginosum var. alpinum. Between 14,700 and 13,600 yr ago, shrub vegetation with dwarf birch, Empetrum, willows, alder, and Shepherdia canadensis developed as a transitional phase prior to the establishment of spruce-dominated woodland 13,600 yr ago. Between this time and 10,000 yr ago, little change occurred in the upland vegetation, except for the expansion of some deciduous elements @? 12,250 yr ago. Local changes in wetland assemblages occurred, primarily in response to changes in lake level. At @?10,000 yr ago, Pinus banksiana expanded at the expense of spruce to form a mixed coniferous-deciduous forest. Climatic interpretation of this vegetational development suggests a progressive increase in temperature since 14,700 yr ago. This unidirectional trend in climatic development contrasts with the glacial history of the state for the time period of interest, as the Lake Superior ice lobe advanced three times between 16,000 and 12,000 yr ago. The lack of correspondence between the pollen stratigraphy and the glacial history is discussed, and hypotheses are presented to explain this apparent anomaly. Notes: FLA 00129615
Duke University Press EN Copyright 1976 The Ecological Society of America URL: http://links.jstor.org/sici?sici=0012-9615%28197623%2946%3A4%3C395%3ALVHAWC%3E2.0.CO%3B2-1 Reference Type: Book Record Number: 264 Author: Wallace, R. L. Year: 1975 Title: Larval behavior of the sessile rotifer Ptygura beauchampi (Edmondson) Series Editor: Sladecek, V. City: Stuttgart, Germany F.R. Publisher: Schweizerbart'sche Verlagsbuchhandlung ISBN: 3510540115 Accession Number: 5260252 Keywords: Invertebrate larvae; Distribution; Biological sampling; Larval settlement; Size distribution; Substrate preferences; Age composition; Settling behaviour; Ptygura beauchampi; Utricularia vulgaris; Gloeotrichia Freshwater Q1 01424 Age and growth Abstract: Lab observations made on larvae of known ages have indicated that they undergo distinct changes in morphology, swimming characteristics, and reactions to substrates, while increasing in size from 50 {mu} to > 200 {mu} in length. New born larvae (up to 120 minutes old) are relatively refractory to settling, particularly during the first 45 minutes of life. This refractory period is important for dispersal since larvae do not immediately settle after birth, but go through an obligatory planktonic stage. Older larval stages (young, mid-aged, and late) react to surfaces in a characteristic exploratory maner. Further, they show unique positive responses to, and will settle on their preferred substrate (U. vulgaris vestibules). Mid-aged larvae (180-270 minuted old) show the greatest propensity for settling. In the absence of their preferred substrate senescent larvae may undergo metamorphosis while free swimming or attached to other surfaces; or they may delay longer. Most larvae which do not settle, die. Notes: Congress in Canada 1974, Winnipeg (Canada), 1974 Congress in Canada 1974. Vol. 19, no. 4, [Verh.Int.Ver.Theor.Angew.Limnol.]. 1975. 12 ref.. Records keyed from 1977 ASFA printed journals. English
Book Monograph Reference Type: Report Record Number: 265 Author: Murphy, T. P.; Lean, D. R. S. Year: 1975 Title: The distribution of iron in a closed ecosystem Institution: Ed Type: Report Report Number: 3510540085 Accession Number: 5256430 Keywords: Iron; Ecosystems; Phytoplankton; Seasonal variations; Metals; Sediment analysis; Chelates; Phosphorus; Nitrogen; Microcystis aeruginosa; Gloeotrichia echinulata; Anabaena flos-aquae; Anabaena spiroides; Anabaena planctonica; Aphanizomenon flos-aquae; Algae Freshwater Q1 01482 Ecosystems and energetics; Q2 02141 General Abstract: There was not a significant correlation of iron to trace metals or to phosphorus in the sedimenting material. There was a large amount of iron returning from the sediments into the open water that must not have been available for biological uptake. Even though the community appeared to secrete a low mol wt substance to chelate the iron, most of the iron not in the seston was associated with magnesium in a molecular size range of 1,000 to 10,000. The periphyton community where nitrogen fixation occurred contained 4 times the iron concn as that where nitrogen fixation was low. The phytoplankton samples that were fixing nitrogen had the highest rates of Super(55)Fe uptake. Notes: Congress in Canada 1974, Winnipeg; Canada, 1974 Congress in Canada 1974. Vol. 19, no. 1., [Verh.Int.Ver.Theor.Angew.Limnol.]. 1975. 20 ref.. Records keyed from 1977 ASFA printed journals. Schweizerbart'sche Verlagsbuchhandlung, Stuttgart, Germany F.R. English
variations; Algal blooms; Primary production; Nutrients (mineral); Aphanizomenon flos-aquae; Anabaena spiroides; Anabaena planctonica; Anabaena flos-aquae; Gloeotrichia echinulata; Microcystis aeruginosa; Algae; Canada, Ontario, Ontario L Freshwater Q1 01482 Ecosystems and energetics
Congress in Canada 1974. Vol. 19, no. 1., [Verh.Int.Ver.Theor.Angew.Limnol.]. 1975. 17 ref.. Records keyed from 1977 ASFA printed journals. Schweizerbart'sche Verlagsbuchhandlung, Stuttgart, Germany F.R. English
Nutrient cycles; Chlorophylls; Seasonal variations; Runoff; Biomass; Algae; Anabaena; Microcystis; Aphanizomenon; Botryococcus; Stephanodiscus; Coelosphaerium; Fragilaria; Gloeotrichia; USA, Iowa; USA, Iowa, Okoboji L; USA, Iowa, Big Spirit L; USA, Iowa, Gar L Freshwater Q1 01423 Behaviour Abstract: The authors tested the importance of annual inputs of plant nutrients to the trophic status of 4 lakes in northwest Iowa, Lake West Okoboji, Big Spirit Lake and Lower Gar Lake. Annual inputs of phosphorus were calculated for the period Aug-July during 3 years. On the average, 0.35kg/ha of total phosphorus annually was lost from the watersheds during the study. Approximately 0.032 gm/m Super(2) of phosphorus was contributed annually to the lake surfaces by precipation. Algal populations in the lakes are arranged in the order of increasing potential phosphorus values. The lake with the highest potential phosphorus has the greatest chlorophyll concn algal populations in individual lakes are responsive to annual inputs, when natural changes in the annual runoff lowered the phosphorus input for a given year, the lakes responded with a smaller algal bloom. Notes: Congress in Canada 1974, Winnipeg (Canada), 1974 Congress in Canada 1974. Vol. 19, no. 2, [Verh.Int.Ver.Theor.Angew.Limnol.]. 1975. 18 ref.. Records keyed from 1977 ASFA printed journals. Schweizerbart'sche Verlagsbuchhandlung, Stuttgart (Germany F.R.) English
00243590
American Society of Limnology and Oceanography latex
Copyright 1975 American Society of Limnology and Oceanography URL: http://links.jstor.org/sici?sici=0024-3590%28197505%2920%3A3%3C379%3ATROAAI%3E2.0.CO%3B2-9 Reference Type: Journal Article Record Number: 268 Author: Daft, M. J.; McCord, S. B.; Stewart, W. D. P. Year: 1975 Title: Ecological studies on algal-lysing bacteria in fresh waters Journal: Freshwater Biol Volume: 5 Issue: 6 Pages: 577-596 Accession Number: 5251358 Keywords: Ecosystems; Biochemistry; Eutrophication; Algae; Bacteria; Cyanophyceae Freshwater Q1 01482 Ecosystems and energetics Abstract: Algal-lysing bacteria are present in 5 lochs, 2 reservoirs, 1 sewage works and 5 alkaline soils which were examined. 9 out of 36 isolates have been studied in detail and all are gram-negative nonfruiting myxobacteria. All are aerophilic, require a neutral or alkaline pH (optimum 7.0-9.0) for good growth, have temp optima of 28-37{degree}C, require contact with the host for lysis to occur, and are so similar in morphology and host range that they all appear to be strains of a single gen. They lyse all bloom-forming Cyanophyceae on which they have been tested, including spp of Anabaena, Aphanizomenon, Gloeotrichia, Microcystis and Oscillatoria. Their abundance is usually correlated directly with the abundance of Cyanophyceae in eutrophic waters and it is probable that in most ecosystems the algae and the bacteria co-exist, although if the equilibrium changes markedly as a result of change in environmental conditions situations may arise where the bacteria may play an important role in the lysis of algal blooms, that this is likely to be a rare occurrence in natural ecosystems. Notes: 1975. Records keyed from 1976 ASFA printed journals. Journal Article
00243590
American Society of Limnology and Oceanography latex
Copyright 1974 American Society of Limnology and Oceanography URL: http://links.jstor.org/sici?sici=0024-3590%28197401%2919%3A1%3C119%3ANF%28RBP%3E2.0.CO%3B2-Y Reference Type: Journal Article Record Number: 269 Author: Lata, Gene F. Year: 1974 Title: Possible occurrence of sterols in blue-green algae Journal: Proceedings of the Iowa Academy of Science Volume: 81 Issue: 2 Pages: 89-90 Accession Number: AN 1975:40479 Keywords: Steroids Role: BIOL (Biological study) (hydroxy, of Microcystis and Gloeotrichia); Gloeotrichia echinulata; Microcystis aeruginosa (sterols of) sterol Microcystis Gloeotrichia; algae sterol Abstract: The blue-green algae such as Microcystis aeruginosa and Gloeotrichia echinulata obtained from blooms in lakes of northwest Iowa contain trace amts. of digitonin-precipitable sterols and show a low level of isotopic incorporation of acetate-1-14C into these compds. [on SciFinder (R)] Notes: CAN 82:40479 10-1
Microbial Biochemistry Dep. Biochem.,Univ. Iowa,Iowa City,IA,USA. Journal 0085-2236 written in English. Reference Type: Journal Article Record Number: 270 Author: Lange, Willy Year: 1974 Title: Chelating agents and blue-green algae Journal: Canadian Journal of Microbiology Volume: 20 Issue: 10 Pages: 1311-21 Accession Number: AN 1975:53901 Keywords: Algae (blue-green, chelating agents of); Chelating agents and Complexing agents (of blue-green algae) chelating agent bluegreen algae Abstract: Many planktonic blue-green algae produce natural chelators which enable them to grow at high pH in the absence of artificial chelators. The growth of 10 cyanophytes without an added chelator was found to differ widely with the algal species. Bacteria-contg. cultures of Anabaena cylindrica, Anacystis nidulans, Lyngbya species, Microcystis aeruginosa, Nostoc muscorum, and Phormidium foveolarum produced their own chelators and grew just as well as the controls with artificial chelating agents. Bacteria-contg. cultures of Anabaena circinalis, Gloeotrichia echinulata, Oscillatoria rubescens, and Aphanizomenon flor-aquae did not produce chelators and, in the absence of artificial agents, grew poorly or perished early. The alga-produced, extracellular chelators were water-sol. and capable of chelating and controlling metal compds. that would exist in colloidal form at pH >7. Accordingly, in the absence of artificial chelators, the nonchelator-forming species grew in the filtrates of the chelator-forming algae the same as in the presence of artificial agents. Bacteria were not involved in the formation of natural chelators, since axenic cultures of Anabaena circinalis, Anacystis nidulans, M. aeruginosa, N. muscorum, and P. foveolarum in the absence of artificial chelators performed about the same as the bacteria-assocd. species. Also, the filtrates of axenic, chelator-forming Anacystis cultures had the same growth-stimulating effect on the nonchelator-forming species as filtrates from bacteria-assocd. cultures. The natural chelators showed partial thermolability. While the growth of chelator-forming species in the absence of artificial chelators was normal during the logarithmic phase, a peculiar, continuing prodn. of total org. matter was obsd. with strongly declining cell nos. of Lyngbya, Microcystis, and Phormidium. The terminal cultures of these species were gelatinous, owing to the presence of extracellular matter, probably consisting of polysaccharides. [on SciFinder (R)] Directory: chemistry chemistry -> Summer 2015 Research Opportunities for Chemistry & Biochemistry Undergraduates chemistry -> Application for Summer Undergraduate Research Program nsf research Experiences for Undergraduates (reu) – 2015 Please Print Clearly or Type chemistry -> Application for Summer Undergraduate Research Program nsf research Experiences for Undergraduates (reu) – 2016 Please Print Clearly or Type chemistry -> Summer 2014 Research Opportunities for Chemistry & Biochemistry Undergraduates chemistry -> Summer 2016 Research Opportunities for Chemistry & Biochemistry Undergraduates chemistry -> Cloud Point Extraction Methodology for Separation and Microamounts Determination of Lead chemistry -> Spring Hill College List of Nearby Restaurant Options Atlanta Bread Company chemistry -> Where the heck is Fernando de Noronha? chemistry -> Topics 6 & 16: Kinetics 1 Collision theory and rates of reaction Download 1.4 Mb. Share with your friends:
|