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Digitale Medien

The relationship between stomatal conductance, transpiration rate and tracheid structure in Pinus radiata clones grown at different water vapour saturation deficits (1983)

WHITEHEAD, D. ; SHERIFF, D. W. ; GREER, D. H.

Oxford, UK : Blackwell Publishing Ltd

Plant, cell & environment 6 (1983), S. 0

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ISSN: 1365-3040

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Biologie

Notizen: Abstract. Stomatal conductance and needle water potential of P. radiata clones were measured after 2, 5 and 8 months on plants grown in controlled environment rooms with markedly different water vapour saturation deficits (D). Conductance was significantly lower at high D, but water potential differences between treatments were not significant. When trees were moved between treatments most of the changes in conductances occurred within 2 h, with residual changes after 24 h. Water potentials were not different 24 h after the trees were moved. The effects were completely reversible.Transpiration rates of individual trees were highest in the high D treatment and lowest in the low D treatment. They were not linearly related to D because of decreasing conductance with increasing D.Height growth, diameter growth and foliage areas were not significantly different between treatments. Tracheid lumen diameters tended to be larger in trees grown at higher D although treatment differences were not significant.There were significant clonal differences in shoot conductance and tracheid dimensions.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/1365-3040.ep11589331

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2

Digitale Medien

The Effects of a Land Drainage Scheme on the Salmonid Populations of the River Camowen, Co. Tyrone (1983)

Kennedy, G. J. A. ; Cragg-Hine, D. ; Strange, C. D. ; [weitere]

Oxford, UK : Blackwell Publishing Ltd

Aquaculture research 14 (1983), S. 0

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ISSN: 1365-2109

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft

Notizen: Annual electro fishing surveys were carried out over an 11-year period at five sites on an upland river, which was subject to dredging operations in connection with a land drainage scheme. Four of the sites were dredged 3 years after the start of the survey and one control site remained undredged throughout. The results indicated that dredging operations initially reduced Salmonid densities and that there was subsequently a progressive downstream recovery, with fry densities taking up to 6 years to improve at the most downstream site. Yearling and older fish recovered to pre-drainage scheme levels more rapidly than fry.Changes in population structure were also observed at three of the dredged sites. Two sites were considerably deepened and finally contained larger numbers of older fish than prior to the drainage scheme. The opposite effect was found to have taken place at a site, which became shallower as a result of drainage works, and contained larger numbers of fry at the end of the survey.Increased fish growth rates were also observed at all sites over the experimental period, and this may have been correlated with enrichment of the river system by leaching from increased fertilizer usage within the catchments.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1365-2109.1983.tb00049.x

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Digitale Medien

Soybean leaf urease: Comparison with seed urease (1983)

Kerr, P. S. ; Blevins, D. G. ; Rapp, B. J. ; [weitere]

Oxford, UK : Blackwell Publishing Ltd

Physiologia plantarum 57 (1983), S. 0

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ISSN: 1399-3054

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Biologie

Notizen: Soybeans, Glycine max (L.) Merr., from ureides for transport of nitrogen from the root nodule to the shoot. The most direct routes for ureide utilization include the degradation of ureide-derived urea to NH3 and CO2. Ureolytic activity was found in leaf disks of soybean and exhbited optimal activity at pH 7 in the presence of a high concentration of urea (250 mM). In vitro studies showed neither urea amidolyase nor urea dehydrogenase activity in soybean leaves and the ureolytic activity was characterized as urease. Several biochemical properties of soybean leaf urease were determined and compared to seed urease properties. Soybean leaf urease differed from that of seed in five ways: pH optima (5.25 and 8.75), apparent Km (0.8 mM), no inhibition by hydroxyurea, faster electrophoretic mobility and no cross-reactivity with soybean seed urease antibodies. The data suggest that urease is the primary urea metabolizing enzyme present in soybean leaves. The properties of soybean leaf urease support the conclusion that a unique isozyme of urease is present in leaf tissue.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1399-3054.1983.tb02297.x

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4

Digitale Medien

Microstructure of Liver Sausage (1981)

RAY, F. K. ; MILLER, B. G. ; SICKLE, D. C. ; [weitere]

Oxford, UK : Blackwell Publishing Ltd

Journal of food science 46 (1981), S. 0

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ISSN: 1750-3841

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung

Notizen: Cooked liver sausage was freeze-fractured and examined using scanning electron microscopy after fixation in either Zenker's solution or osmium tetroxide. The microstructure was characterized as consisting of dispersed protein particles and fibrous networks of protein surrounding variable-sized fat globules. If the fat globules were not thoroughly fixed they were dislodged from the freeze-fractured surfaces leaving vacuoles that could easily be mistaken for air pockets. The study demonstrated that the structure of liver sausage includes both an oil in water emulsion with protein as the emulsifier as well as dense layers of protein or protein-fat colloidal complexes.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1365-2621.1981.tb15327.x

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Digitale Medien

Sensory Properties and Lipid Oxidation in Prerigor Processed Fresh Pork Sausage (1981)

DRERUP, D. L. ; JUDGE, M. D. ; ABERLE, E. D.

Oxford, UK : Blackwell Publishing Ltd

Journal of food science 46 (1981), S. 0

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ISSN: 1750-3841

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung

Notizen: Fresh pork sausage prepared from prerigor ground and salted meat had higher pH, lower cooking losses, higher juiciness scores, and less easily fragmented cooked patties than that prepared from post-rigor ground and salted meat. Sausage from prerigor ground-post-rigor salted meat was intermediate in these properties to prerigor ground and salted and postrigor ground and salted products. Prerigor grinding and salting reduced the rate of autoxidation (TBA number) during storage at 0°C contrasted to oxidation in sausage that was salted postrigor after either prerigor or postrigor grinding.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1365-2621.1981.tb04456.x

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