Exclusion of strain 670/89 as type strain for serovar 20 of Riemerella anatipestifer

Classical phenotypic characterisation and numeric analysis of whole-cell fatty acid patterns of twenty-one type strains of hitherto reported Riemerella anatipestifer serovars revealed that the type strain of serovar 20 does not belong to the species Riemerella anatipestifer sensu stricto and, therefore, it has to be excluded as a representative Riemerella anatipestifer serotype strain.     

刈牧后休闲期对草地牧草生产的影响

通过不同间隔时期对多年生黑麦草、白三叶混播草地牧草产量的监测与分析,得出随着休闲期的增加,青绿物质和死亡物质均呈现上升趋势,在较低和较高草地牧草现存量下都会降低牧草生长率。     

贵州足球场草坪建植及化管理模型研究

在一定的生境和管理条件下,以修剪高度、修剪次数和施N、P、K量为因素,利用二次正交回归设计,用模糊综合评分法评定草坪质量,最佳3因子水平为:修剪高度5～7.4cm,修剪次数4～6次/月,施N量为2.5～3.7g/(m2·年),施P、K量各为L25～1.85g/(m2·年),建立了草坪质量与养护3因子间的显著相关回归模型.     

Relative Contributions of Uranium, Thorium, and Potassium to Heat Production in the Earth

Data from a wide variety of igneous rock types show that the ratio of potassium to uranium is approximately 1 X 10(4). This suggests that the value of K/U approximately 1 X 10(4) is characteristic of terrestrial materials and is distinct from the value of 8 X 10(4) found in chondrites. In a model earth with K/U approximately 10(4), uranium and thorium are the dominant sources of radioactive heat at the present time. This will permit the average terrestrial concentrations of uranium and thorium to be 2 to 4.7 times higher than that observed in chondrites. The resulting models of the terrestrial heat production will be considerably different from those for chondritic heat production because of the longer half-life of U(238) and Th(238) compared with K(40).     

Relation of dispersivity to properties of homogeneous saturated repacked soil columns

It is expected that solute dispersivity is determined by the physical properties of the transport medium. However, experimental investigations to date have not identified such a relationship. In this work, we examine the relation between soil physical parameters, experimental parameters and dispersivity. Experimental data were compiled for 291 repacked, saturated homogeneous laboratory column experiments reported in the literature. Using multiple stepwise regression and classification and regression tree analysis, the relationships between soil physical parameters (sand, silt and clay content, bulk density, water content), experimental parameters (pore‐water velocity, column length and diameter), and transport parameters (dispersion coefficient and dispersivity) were examined. Regression tree analysis showed that clay content was the most important factor controlling dispersivity, followed by column diameter. Columns of length less than approximately 10 cm generally resulted in greater dispersivities than longer columns. A scale effect appeared significant with increasing column diameter, but was not apparent with column length. These results suggest that it may only be possible to relate dispersivity to intrinsic soil properties by explicitly accounting for the experimental design, including column geometry, inlet dead volume and soil packing.     

Phallus-inflammation of ganders: clinical observations and comparative bacteriological examinations of healthy and altered organs

The examination of acute or chronically altered phallus-tissues of ganders revealed microorganisms belonging to the genera Mycoplasma, Bacteroides, Clostridium, Streptococcus, Micrococcus, Staphylococcus, Lactobacillus, Corynebacterium, Escherichia, Campylobacter, Proteus, Pseudomonas and Candida and to the family Pasteurellaceae, isolated in different frequencies. Bacteriologic examinations of the phallus-tissues and cloacal mucous membranes of healthy juvenile ganders showed microorganisms of the same genera or family, except Mycoplasma and Candida spp. Pathogenesis and possibilities of treating phallus-inflammations in ganders are discussed.     

Chronic intestinal pseudo-obstruction in a dog

SUMMARY A three-year-old neutered female Border Collie was presented with in-appetence, vomiting and diarrhoea. Abdominal radiographs revealed an obstructive pattern but no physical obstruction was evident at laparotomy. A diagnosis of chronic intestinal pseudo-obstruction was made based on histopathological changes in intestinal biopsies. Treatment was unsuccessful and the dog deteriorated progressively until euthanased five weeks after presentation.