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The effects of urban runoff on lakes in Bracknell New Town : With special reference to diatomsGuzkowska, M. A. J. January 1985 (has links)
No description available.
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Extraction, purification and characterization of chlorophyllase from alga Phaeodactylum tricornutumKhalyfa, Abdelnaby January 1993 (has links)
No description available.
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Effect of nutrient enrichment on marine benthic diatoms in Yaquina Bay, OregonCardon, Nanette Clark 18 May 1981 (has links)
Sediment was fertilized with f/2 algal growth medium
in situ and in the laboratory daily for one week. Sampling
strategy incorporated two intertidal heights and two sites.
Experiments were done in August and January. No significant
changes in chlorophyll a or diatom community structure
were observed after ten days of growth in either the
field or the laboratory experiments. Laboratory experiments
also showed slightly increased gross primary production
(p<.10) and increased oxygen uptake (p<.01) associated
with nutrient enrichment.
Unlike planktonic diatoms, sediment-associated diatoms
in Yaquina Bay show no nutrient limitation. Thus other
factors probably control diatom growth in these sediments
such as light intensity, photoperiod, intertidal height,
sediment stability and organic content, and animal consumption. / Graduation date: 1982
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The effect of light intensity on the organic composition of marine phytoplankton diatomsMarmelstein, Allan 18 July 1969 (has links)
Investigation was made into the influence of changing light
intensity on the organic and elemental composition of two species of
marine diatoms, Ditylum brightwellii and Skeletonema costatum.
Analysis was made of the relative changes in soluble and insoluble
carbohydrate; polar, non-polar, and total lipid; amino acids; proteins;
and total carbon, hydrogen, nitrogen, and oxygen. Photosynthetic
quotients were calculated from both organic and elemental
composition.
The response of soluble and insoluble carbohydrate was
directly related to light intensity, although differences were noted
between the two fractions. In general, amino acids and proteins
showed little or no response to light intensity. Polar (pigment)
lipids usually varied inversely with light intensity, whereas non-polar
lipids varied directly with intensity. Total lipids also varied
inversely with intensity although, considering the total amount of
lipid present, the changes were slight. Some differences in relative
organic composition were noted between the two species. On the
basis of the data, average organic composition of each species was
computed and compared with similar data in the literature.
The effect of light intensity on the elemental composition of
the two species yielded some differences, which were more readily
apparent in the photosynthetic quotients calculated from elemental
data. The photosynthetic quotient varied inversely with light
intensity.
Conclusions are summarized and suggestions for future
research included. / Graduation date: 1970
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Cell death, growth and physiological responses of a marine diatom to silicon and nitrogen starvation and resupply in the light and dark /Jiang, Yuelu. January 2009 (has links)
Ph.D. in Marine Environmental Science. Includes bibliographical references (p. 137-155).
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Extraction, purification and characterization of chlorophyllase from alga Phaeodactylum tricornutumKhalyfa, Abdelnaby January 1993 (has links)
Biomass production of chlorophyllase of the marine alga (Phaeodactylum tricornutum) at the exponential and stationary stages was performed. The results demonstrated that the biomass yield at the stationary stage was three times that of the exponential stage. A procedure for the extraction and purification of chlorophylls from fresh spinach leaves, used as substrate, was also developed. Chlorophyllase was extracted from photosynthetic membranes of the disrupted cells and partially purified. The purification procedure resulted into 70-fold increase in enzyme activity. Further purification of the partially purified enzyme was performed, using preparative isoelectric focusing on Rotofor-Cell System. Three enzyme fractions, FI$ sp prime$, FII$ sp prime$, and FIII$ sp prime$ were separated, however, most of enzyme activity (84%) was located in fraction FII$ sp prime$. The partially purified chlorophyllase was further purified by native preparative gel electrophoresis on Prep-Cell System, which resulted into a single active fraction. The purified enzyme fraction was then subjected to further purification, using automated Fast Protein Liquid Chromatography (FPLC) System, on ion-exchange Mono Q HR 5/5 column. The purification procedure resulted into two well separated isozymes, FI$ sp prime$ and FII$ sp prime$. Enzyme fraction (FI$ sp prime$) showed the highest enzymatic activity compared to FII$ sp prime$. The homogeneity of each fraction was demonstrated by a single protein band on SDS-PAGE. The molecular weights of these fractions FI$ sp prime$ and FII$ sp prime$ were 67 kD and 66kD, respectively. The optimum pH for chlorophyllase activity fractions FI$ sp prime$, and FII$ sp prime$ were 8.0 and 8.3, respectively. The enzymatic fraction FI$ sp prime$ showed higher activity towards commercial purified chlorophyll b when it was compared to that with the crude chlorophyll, partially purified chlorophyll and commercial purified chlorophyll a. However, enzymatic fraction FI
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A diatom population and nutrient survey in the Mississippi River at Lock 7 and Lock 8 /Ozburn, Clement C. January 1969 (has links)
Thesis (M.S.)--Wisconsin State University (La Crosse), 1969. / Includes bibliographical references (leaf [18]).
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Mechanisms controlling long-term changes in periphytic diatom community structure /Olson, Olaf Gerald, January 1998 (has links)
Thesis (Ph. D.)--Lehigh University, 1998. / Includes vita. Bibliography: leaves 98-109.
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Cenozoic nonmarine diatoms from the Great Basin thesis /Lohman, K. E. January 1957 (has links)
Thesis (Ph. D.)--California Institute of Technology, 1957. / Includes bibliographical references (leaves 175-181).
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Metaphyton mat conditions and their effects on filamentous algal communities and their diatom epiphytes /Saunders, Lynnette Lavery. Kilham, Susan Soltau, January 2009 (has links)
Thesis (Ph.D.)--Drexel University, 2009. / Includes abstract and vita. Includes bibliographical references (leaves 85-94).
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