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排序方式: 共有83条查询结果,搜索用时 765 毫秒
1.
In the period December 1967 through April 1969 eight spontaneous cases of pseudorabies in Danish red foxes were demonstrated by virus isolation. One fox had been kept in captivity, the remaining seven were free-living. Five of the foxes were found dead, while three, presenting abnormal behaviour when encountered, had been killed. 相似文献
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K Zahn M Kornmayer U Matis 《Veterinary and comparative orthopaedics and traumatology》2007,20(4):256-263
The goal of this retrospective study was to describe dowel pinning, and to compare the results of osteosynthesis and external coaptation of metacarpal and metatarsal fractures in cats. Evaluation of the medical records of 351 cats yielded 63 cats treated with dowel pinning, 35 cats treated with external coaptation and 14 cats treated with both methods within the same limb. All of the cats had been re-evaluated at an average of 2.8 years (six months - 15 years) postoperatively. Dowel pinning was superior to external coaptation when all fractured bones of a limb could be pinned. When internal fixation of multiple fractures was not feasible in all fractured bones due to comminution or fragments that were too short to pin, the outcome was not significantly different from cases treated with external coaptation alone. Malunion was seen in 16% of fractured bones in cats treated with external coaptation and occurred secondary to implant bending in 3% of fractured bones treated with dowel pinning. The latter refers to one operated cat, which had four metacarpal fractures in the same limb. Radiographs taken at re-evaluation showed implant migration within the medullary canal in two cats, although neither showed any signs of non-union or lameness. Non-union was seen in one operated cat, in which the fracture (MC IV) could not be completely reduced with a K-wire. Osteomyelitis did not occur. Dowel pinning is an easy, inexpensive and effective technique for repair of metacarpal and metatarsal fractures in cats. 相似文献
3.
Louisa Wessels Perelo Miguel Jimenez Jean Charles Munch 《Soil biology & biochemistry》2006,38(5):912-922
Microbial biomass N dynamics were studied under field and laboratory conditions in soils of high yield (HY) and low yield (LY) areas in an agricultural field. The objective of the study was to determine the size and activity of soil microbial biomass in the soils of the different yield areas and to compare these data obtained under field and laboratory conditions. Soils were amended with 15N labelled mustard (Sinapis alba) residues (both experiments) and labelled nitrate (laboratory only) at 30 μg N g−1 dry soil. Soil microbial biomass (SMB) N, mineral N (Nmin) and total N content was monitored both in the field and in the laboratory. N2O efflux was additionally measured in laboratory treatments. Isotope ratios were determined for SMB in both experiments, for all other parameters only in the laboratory treatments. In the laboratory less amounts of added substrate N were immobilised by the SMB in HY soils compared to LY soils, whereas in the field immobilisation of added N by SMB was higher in HY soils initially and slightly lower after 40 days of incubation. Calculated turnover times in the laboratory nitrate, laboratory mustard and field mustard amendments were 0.18, 0.27 and 0.74 years (HY) and 0.22, 0.61 and 1.01 years (LY), respectively. The turnover times of added substrate N always showed the trend to be faster in HY soils compared to LY soils. A faster turnover of nutrients in the HY soils may involve a better nutrient supply of the plants, which coincides with the higher agricultural yield observed in these areas. 相似文献
4.
Peter?Schr?derEmail author Beate?Huber Jean?Charles?Munch 《Journal of Soils and Sediments》2003,3(4):223-226
All forms of agriculture cause changes in the balances and fluxes of preexisting ecosystems, thereby limiting self-regulatory
ecosystem (resiliency) functions. The intensive agriculture of the past, with its strong reduction of landscape structures
and vast decoupling of energy and matter cycles, has caused stress and degradation of the production base; massive influence
has also been exerted on neighboring compartments. This has resulted in the well known problems of pesticide loads, high phosphate
loads to surface waters via over-fertilized soils or erosion as such. To overcome the economic, social and political inadequacies
leading to ecological degradation, the demand for sustainable agricultural management needs to be transposed into knowledge-based
practical instructions and political regulations on a regional scale. Thus, applied research for a sustainable and ecologically
compatible land use aimed at sufficient food production is ever so important. In the FAM, thirty German research institutes
have merged to perform research on this topic. 相似文献
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Effect of cell contact and iron(III)-oxide form on bacterial iron reduction By means of a semipermeable membrane the influence of the separation of cells from Fe(III)-oxides (125–63 μm) was studied in model experiments using iron-reducing bacteria (Clostridium butyricum S 22 a and Bacillus polymyxa S 55) which lower the Eh considerably. Synthetic sieved (125–63 μm) hematite (Merck) was included in dialytic bags (pores < 20 Å), incorporated in a glucose-mineral salt broth (pH 7–7.2) and inoculated (anaerobically, 30°C). Fe(II) production (in solution), pH and Eh were measured (and the rH calculated) at regular intervals. In the second experiment, the preferential reduction of lepidocrocite, hematite and goethite was investigated, by mixing 59Fe-labelled oxide forms with other crystalline oxides or with x-ray amorphous Go-soil material (all sieved at 125–63 μm). 相似文献
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10.
Soil compaction and soil moisture are important factors influencing denitrification and N2O emission from fertilized soils. We analyzed the combined effects of these factors on the emission of N2O, N2 and CO2 from undisturbed soil cores fertilized with (150 kg N ha−1) in a laboratory experiment. The soil cores were collected from differently compacted areas in a potato field, i.e. the ridges (ρD=1.03 g cm−3), the interrow area (ρD=1.24 g cm−3), and the tractor compacted interrow area (ρD=1.64 g cm−3), and adjusted to constant soil moisture levels between 40 and 98% water-filled pore space (WFPS).High N2O emissions were a result of denitrification and occurred at a WFPS≥70% in all compaction treatments. N2 production occurred only at the highest soil moisture level (≥90% WFPS) but it was considerably smaller than the N2O-N emission in most cases. There was no soil moisture effect on CO2 emission from the differently compacted soils with the exception of the highest soil moisture level (98% WFPS) of the tractor-compacted soil in which soil respiration was significantly reduced. The maximum N2O emission rates from all treatments occurred after rewetting of dry soil. This rewetting effect increased with the amount of water added. The results show the importance of increased carbon availability and associated respiratory O2 consumption induced by soil drying and rewetting for the emissions of N2O. 相似文献