摘要:

SUMMARYChlorella pyrenoidosaChick (Indiana University Number 252), Nostoc communeVaucher (I.U. 584), andOscillatoria prolifica(Grev.) Gomont (I.U. 1270) were grown separately on Peoria loess soil material to measure their effects on the water stability of soil aggregates. Each alga significantly (10% LSD) increased the percentage of soil aggregates after 6 weeks of incubation as compared with the soil without algae.Oscillatoria, Chlorella, andNostocincreased water stability of aggregates>74 μ in diameter by 3.4, 1.1, and 0.6%, respectively.NostocandOscillatoriaproduced measurable water stable aggregates in the 1000–2000 μ diameter range; Chlorellaformed them in the 500–1000 μ range, while the control soil showed no aggregates

ISSN:0022-3646    

DOI:10.1111/j.0022-3646.1973.00099.x

出版商:Blackwell Science Inc    

年代:1973

数据来源: WILEY

摘要:

SUMMARYAnin situcomparison of environmental and physiological factors was undertaken in 1971–72 (15 months) in the Niantic River estuary to elucidate some of the important aspects, of the growth and development of the seaweedCodium fragile.In general,Codiumin the estuary has a growing season of from 6 to 9 months. Growth increments during this period are relatively constant. Temperature and salinity are the main limiting factors to growth, although low summer concentrations of inorganic nitrogen may also be involved. Reproduction by means of swarmers occurs only in late summer or autumn.Codiumappears highly adapted to the role of a colonizing species. It not only possesses the capability to occupy the harshest of environments, but also a system of reproductive alternatives which facilitates rapid colonization. The availability of substrate for attachment is the chief factor limiting its spread in this estuarine syste

ISSN:0022-3646    

DOI:10.1111/j.0022-3646.1973.00102.x

出版商:Blackwell Science Inc    

年代:1973

数据来源: WILEY

摘要:

SUMMARYOchromonas danicagrown in a chemically defined medium under controlled conditions at different incubation temperatures showed marked changes in chemical composition and secretory pattern. As the incubation temperature rose from 15 to 30 C, the cell number per unit volume of medium increased; the cell mass reached a maximum and then declined slightly, and the weight per single cell decreased. The chemical composition of the cells changed with increasing temperature: carbohydrates decreased dramatically; proteins quadrupled at 20 C and then declined 25%; lipids increased; and RNA increased to 25 C and then decreased to about 40% of maximum at 30 C. The extracellular secretion by the cells of carbohydrates seemed to increase and then decline; RNA decreased; proteins increased; and lipids remained approximately constant, as the temperature increased. The implications of these findings for thermal pollution are discussed.

ISSN:0022-3646    

DOI:10.1111/j.0022-3646.1973.00111.x

出版商:Blackwell Science Inc    

年代:1973

数据来源: WILEY

摘要:

SUMMARYAlthoughProtothecais generally considered to be a colorless member of theChlorococcales, there have been a number of attempts to relate it to the fungi. However, our ultrastructural observations support the conclusion that it is indeed a nonphotosynthetic alga and not a fungus. One such structural feature that is of special interest is the presence of membrane‐bounded starch granules which are considered to be storage plastids. Fungi are not known to produce plastid

ISSN:0022-3646    

DOI:10.1111/j.0022-3646.1973.00113.x

出版商:Blackwell Science Inc    

年代:1973

数据来源: WILEY