Extraktion eines kupferbelasteten Bodens unter Verwendung eines aminosäurehaltigen Reststoffhydrolysats. 2. Elutionsdynamik und Bilanzierung der Aminosäuren nach kontinuierlichem Eintrag in Bodensäulen     

Klaus Fischer  Karlheinz Blay  Jarmila Kotalik  Peter Riemschneider  Dietmar Klotz  Antonius Kettrup 《植物养料与土壤学杂志》1997,160(4):511-518

Extraction of a copper contaminated soil material by the percolation of an amino acid containing residue hydrolysate. 2. Time course of amino acid elution and input/output balance of amino acids During 16 days an amino acid containing blood meal hydrolysate (amino acid concentration: 188 mMol·L^?1) was percolated through a column packed soil material (soil content per column: 4.1 kg dry weight, four parallels). The copper contaminated material (soil type: Typic Udifluvent, soil texture: sandy loam, loamy sand) was sampled from an area formerly used for cultivation of hop (Humulus lupus). Besides the investigation of the copper liberation the experiments aimed to determine the elution dynamic and input/output balance of amino acids (time span for amino acids balance 14 days). In total 11.7 L of hydrolysate, containing 2.2 Mol of amino acids, were introduced into each column. The mean amino acid output with the column effluent was 1.13 Mol. This corresponds to an elution degree of 51.2%, related to the sum of applicated amino acids, and to a mean substance specific elution degree of 48.4% reflecting the elution of 15 compounds. The substance specific elution ranged from 9.6% (serine) to 75.5% (valine). The highest concentrations of serine and threonine were determined in the effluents after two days, whereas the histidine concentration was highest at the last sampling. The differences in the percolation properties of the amino acids are discussed in terms of important retention and elimination processes (biodegradation, ad-/desorption, intercalation).  相似文献   

Neubert,S., M. Blumberg,U. Pauly und Gesamthochschule Kassel (Herausg.): Kommunikation im Ökosystem; Ekopan-Verlag Witzenhausen, 1989; 176 S., 28 Abb., 15 Tab., ISBN 3-927080-04-7, kartoniert DM 27, 50     

W. R. Fischer 《植物养料与土壤学杂志》1990,153(2):129-129

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Ein Elektrodensystem zur Messung des Redoxpotentials im Kontaktbereich Boden/Wurzel     

W. R. Fischer  G. Schaller 《植物养料与土壤学杂志》1980,143(3):344-348

An electrode matrix for Eh measurements in the root/soil interface For redox potential measurements in the rhizosphere an electrode matrix was constructed from a teflon disc, in which 37 short Pt wires were placed with a 3.5 mm distance between two electrodes. The potentials of these electrodes were recorded periodically by a data logger and were stored on punched tape. With this arrangement, redox potential patterns for the rhizosphere of single roots could be recorded and plotted by a small computer.  相似文献   

Differenzierung oxalatlöslicher Eisenoxide     

W. R. Fischer 《植物养料与土壤学杂志》1976,139(5):641-646

Differentiation of oxalate soluble iron oxides According to their mode of formation the oxalate soluble Fe(III)-oxides show different rates of dissolution especially within the first 30 min of oxalate extraction. Precipitates formed by bacterial or oxidative decomposition of ferric citrate have a very high dissolution rate with more than 90 percent being dissolved within 30 min. Ferrihydrites prepared by alkaline hydrolysis of Fe(III) salts, after slow drying, dissolve to about 60 to 80 percent within this period, whereas similar products quenched with liquid N₂ dissolve more rapidly. A plot of (Fe₃₀/Fe_o) vs. (Fe_o/Fe_d) allows to draw a boundary line between the field of podzol values and the field of the other pedogenic iron oxides, as from brown earths and black earths (chernozems).  相似文献   

Die Oberflächenladung der Ton-Humusfraktion aus Schwarzerden als Funktion von pH und Ca-Konzentration     

Klaus Bckenhoff  Stefan Gall  Walter R. Fischer 《植物养料与土壤学杂志》1997,160(2):341-346

Surface charge of clay-humus fractions from Chernozems as a function of pH and Ca-concentration The charge characteristics of clay-humus fractions from A-horizons of several Chernozems as a function of Ca concentration and pH of the soil solution was investigated. The surface charge was measured by titration with charge compensating polyelectrolytes; the endpoint was at zero potential. A logarithmic dependence of the surface charge [mol_c/kg] on the Ca concentration of the soil solution in the range ? 2 mmol/L was observed. The influence of pH on the surface charge was almost linear over a wide range of pH-values, the change in pH-dependent charges being most pronounced for the horizons with low Ca saturation on the exchange sites. It was also found that the competition between protons and Ca ions for the exchange sites leads to a distinct decrease of the influence of Ca concentration on the surface charge in acid environment. The reason for slaking of the soil surface and of the displacement of clay-humus particles in Chernozems could be attributed to an increase in surface charge with decreasing Ca concentrations after leaching of lime. According to the present findings the drop in mobility of the clay-humus fractions during acidification could be explained by a charge compensating effect of protons and aluminium ions.  相似文献   

Paul,E.A., und McLaren,A.D. (Herausgeber): Soil Biochemistry Band 3. Verlag Marcel Dekker,Inc. New York 1975, XV + 334 S., gebunden $ 27,50     

W. R. Fischer 《植物养料与土壤学杂志》1976,139(5):655-655

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Detection of equine X chromosome abnormalities inequids using a horse X whole chromosome paint probe (WCPP)     

M. Breen  C.F. Langford  N.P. Carter  P.E. Fischer  E. Marti  C. Gerstenberg  W.R. Allen  T.L. Lear  M.M. Binns 《Veterinary journal (London, England : 1997)》1997,153(3):235-238

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Possible phycomycetes granuloma in the larynx of a horse.          下载免费PDF全文

P Fretz  R Fischer 《The Canadian veterinary journal. La revue veterinaire canadienne》1976,17(11):293-297

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Laparoscopic cryptorchidectomy in horses.     

A T Fischer  A M Vachon 《Journal of the American Veterinary Medical Association》1992,201(11):1705-1708

Laparoscopic cryptorchidectomy was successfully performed in 15 standing or recumbent horses. In 3 horses, owners believed that castrations had been performed, but the horses had retained stallion-like behavior. Successful removal of undescended testes in these horses stopped this behavior. Laparoscopy offered excellent visualization of the structures of the vaginal ring and facilitated removal of the abdominally located testis. The internal and external inguinal rings were not invaded, thus the chance of serious complications that may result during open cryptorchidectomy procedures was minimized.  相似文献   

Calving rates in a tropical beef herd after treatment with a synthetic progestagen, norgestomet, or a prostaglandin analogue, cloprostenol     

JE FRISCH  CJ O'NEILL 《Australian veterinary journal》1996,73(3):98-102

Maiden heifers and lactating cows of known ovarian status and of several breeds were treated with a synthetic prostaglandin, cloprostenol, or a synthetic progestagen, norgestomet, at the start of an artificial insemination (AI) program. Animals in the cloprostenol treatment received 2 injections 10 days apart. Over the next 26 days those animals that showed oestrous behaviour were inseminated. Synchronisation rates and calving rates to insemination over the first 7 days were calculated. Those in the norgestomet treatment received an implant of norgestomet plus an injection of norgestomet and oestradiol valerate. The implant was removed 10 days later and the animals were given an injection of pregnant mare serum gonadotrophin (PMSG). They were inseminated at 48 h (maiden heifers) or 56 h (lactating cows) after implant removal. Calving rates to fixed-time insemination were recorded. After completion of the AI program the animals in both treatments were joined with bulls. Overall calving rates (AI plus bulls) were calculated. By day 7 of the program, 82% of the maiden heifers and 76% of the lactating cows in the cloprostenol treatment had been detected in oestrus. By day 21 the respective figures were 99% and 81% Norgestomet treatment had an immediate and a prolonged effect on ovarian activity in those females classified as having inactive ovaries at the start of the AI program. Calving rates of those females to fixed-time AI and overall were similar to those of the females with active ovaries in both treatments. Their calving rates to fixed-time insemination, and overall calving rates for the lactating females, were significantly higher than the corresponding values of their contemporaries treated with cloprostenol and inseminated on observed oestrus over 7 days. For those females classified as having active ovaries at the start of the AI program, calving rates to first insemination and overall were similar for both treatments. Overall calving rates of lactating cows of each breed were, with one exception, higher in the norgestomet treatment than in the cloprostenol treatment. Although norgestomet treatment was more expensive than cloprostenol treatment, the advantage in calf crop resulted in an overall monetary advantage to the norgestomet treatment.  相似文献