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1

Digitale Medien

An Ultrastructural Study of Vairimorpha necatrix (Microspora, Microsporida) with Particular Reference to Episporontal Inclusions During Octosporogony (1992)

MOORE, CLYDE B. ; BROOKS, WAYNE M.

Oxford, UK : Blackwell Publishing Ltd

The @journal of eukaryotic microbiology 39 (1992), S. 0

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ISSN: 1550-7408

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Biologie

Notizen: . The life cycle of Vairimorpha necatrix was studied by electron microscopy. Disporous development has two distinct stages: 1) diplokaryotic meronts which are actively mitotic, and 2) diplokaryotic sporonts which are distinguished by reduced ribosome density and a thickened plasmalemma. After final division of the sporont, sporoblasts form spores which are ovocylindrical and measure 4.4 ± 0.08 × 2.3 ± 0.05 μm (mean ± SE). Octosporous development results in eight haploid spores being formed in a sporophorous vesicle. The uninucleate octospores were smaller than the binucleate dispores and the exospore was thicker but less crenulate in outline. Early in octosporogony, tubules are produced from the sporont plasmalemma and electron-dense material accumulates in the episporontal space. The latter may be amorphous, vesiculated, or vacuolated in appearance and in later stages may take a stacked, lamellar form. At sporoblast formation, exospore material coats the plasmalemma and attached tubules; all inclusions in the episporontal space gradually disappear as spores are formed. These secretory products may have application to taxonomic distinction at the species level.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1550-7408.1992.tb01469.x

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2

Digitale Medien

A TECHNIQUE TO RECONSTRUCT RIVER DISCHARGE HISTORY FROM TREE-RINGS (1983)

Wendland, Wayne M. ; Watson-Stegner, Donna

Oxford, UK : Blackwell Publishing Ltd

Journal of the American Water Resources Association 19 (1983), S. 0

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ISSN: 1752-1688

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Architektur, Bauingenieurwesen, Vermessung , Geographie

Notizen: : Cores were obtained from several tree species located both on a river floodplain and a nearby terrace. A ratio of annual tree growth on floodplains to terrace growth was developed and shown to be related to the annual river discharge. Growth ratios from the time prior to written records can therefore be used to reconstruct river discharge and infer past unrecorded flood frequency. Oak and basswood ratios yielded the best models for discharge reconstruction, whereas those of elm and birch were less useful. This method permits reconstruction of river discharge from an assemblage of growth cores obtained within a relatively small area.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1752-1688.1983.tb05311.x

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3

Digitale Medien

Localization of Glyoxylate Cycle Enzymes in Glyoxysomes in Euglena (1972)

GRAVES, LYNN B. ; TRELEASE, RICHARD N. ; GRILL, ALBIN ; [weitere]

Oxford, UK : Blackwell Publishing Ltd

The @journal of eukaryotic microbiology 19 (1972), S. 0

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ISSN: 1550-7408

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Biologie

Notizen: SYNOPSIS. We demonstrated previously microbodies in Euglena gracilis grown in the dark on 2-carbon substrates. We have now established in Euglena the particulate nature of enzymes known in other organisms to be localized in microbodies (glyoxysomes and leaf peroxisomes). On a linear sucrose gradient the glyoxylate cycle enzymes band together at a nigner equilibrium density (1.20 g/cm3) than mitochondrial marker enzymes (1.17 g/cm3), establishing the existence in Euglena of glyoxysomes similar to those of higher plants. Glyoxylate (hydroxypyruvate) reductase and, under certain conditions, also glycolate dehydrogenase co-band with the glyoxylate cycle enzymes, suggesting that Euglena glyoxysomes, like those of higher plants, may contain peroxisomal-type enzymes. Catalase, an enzyme characteristic of microbodies from a variety of sources, was not detected in Euglena.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1550-7408.1972.tb03521.x

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4

Digitale Medien

Beta-Oxidation in Glyoxysomes from Euglena (1974)

GRAVES, LYNN B. ; BECKER, WAYNE M.

Oxford, UK : Blackwell Publishing Ltd

The @journal of eukaryotic microbiology 21 (1974), S. 0

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ISSN: 1550-7408

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Biologie

Notizen: SYNOPSIS. We demonstrated previously the presence of glyoxysomes containing the glyoxylate cycle enzymes in Euglena gracilis grown in the dark on ethanol. We have now established that the glyoxysomes of Euglena grown on hexanoate also contain the following enzymes of the pathway for β-oxidation of fatty acids: hexanoyl-CoA synthetase, 3-β-hydroxyacyl-CoA dehydrogenase and thiolase. Estimations of specific activities indicate that these enzymes are over 20 times as active in glyoxysomes as they are in mitochondria, suggesting that the β-oxidation of fatty acids occurs almost entirely in Euglena glyoxysomes under these conditions. Thus, the entire portion of the gluconeogenic pathway from fatty acid to succinate is localized in the glyoxysome of Euglena.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1550-7408.1974.tb03750.x

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5

Digitale Medien

Feeding Mechanisms of Babesia equi (1974)

FRERICHS, WAYNE M. ; HOLBROOK, A. A.

Oxford, UK : Blackwell Publishing Ltd

The @journal of eukaryotic microbiology 21 (1974), S. 0

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ISSN: 1550-7408

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Biologie

Notizen: SYNOPSIS. Electron microscope and time lapse, phase contrast cinematography studies on Babesia equi organisms within equine red blood cells revealed that this hemoprotozoon has two organelles possibly involved with ingestion of nutrients: a cytostome that takes in hemoglobin from the host cell and a tubule that extends from the main body of the parasite through the erythrocyte to the blood plasma and appears to ingest plasma during periods of rapid growth and development.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1550-7408.1974.tb03734.x

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6

Digitale Medien

HYDROLOGICAL ASPECTS OF THE 1988 DROUGHT IN ILLINOIS (1990)

Wendland, Wayne M.

Oxford, UK : Blackwell Publishing Ltd

Journal of the American Water Resources Association 26 (1990), S. 0

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ISSN: 1752-1688

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Architektur, Bauingenieurwesen, Vermessung , Geographie

Notizen: : Drought is evaluated in terms of the magnitude and duration of the 1988 spring and summer precipitation shortfall, and according to various components of the hydrologic budget, both surface and sub-surface. The response time of some of these components is investigated, relative to the time of precipitation. Individual water users perceived a beginning and ending of the drought at different times relative to their activities. Some statistics better describe some components of a drought to some users, and better answer some questions, than do others.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1752-1688.1990.tb01424.x

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