Serum creatinine concentrations in retired racing Greyhounds

Background: Greyhounds frequently have laboratory values that are outside reference intervals established for dogs. Our recognition of increased serum creatinine concentrations in several Greyhounds posed a problem when evaluating a Greyhound with suspected renal disease.
Objective: The purpose of this study was to compare serum creatinine concentrations between Greyhound and non-Greyhound dogs.
Methods: Thirty retired racing Greyhounds and 30 age-and gender-matched control non-Greyhound dogs were evaluated. Serum creatinine concentrations in both groups were measured using a standard biochemical method and compared statistically using a Kruskal-Wallis test.
Results: Creatinine concentration was significantly higher in the Greyhounds ( P < .01) than in the control group.
Conclusion: Greyhounds have a higher serum creatinine concentration than do non-Greyhound dogs. This idiosyncrasy should be taken into account when evaluating healthy Greyhounds and those with suspected renal disease.     

Effect of desmopressin on plasma factor VIII and von Willebrand factor concentrations in Greyhounds

Objective To determine the effect of 1-Deamino-8-D-argi-nine vasopressin on plasma concentrations of von Willebrand factor and factor VIII in Greyhound blood donors, and to compare the response of 1-Deamino-8-D-arginine vaso-pressin injection on plasma concentrations of von Willebrand factor between groups with different resting plasma concentrations of von Willebrand factor.
Animals Fifteen Greyhound blood donors were used. Dogs were grouped into three categories depending on their von Willebrand factor concentrations.
Procedure Desmopressin was administered subcuta-neously at 1 mg/kg to all dogs. Plasma von Willebrand factor and factor VIII concentrations were measured before and 10, 20, 30, 45, 60, 90 and 120 min after desmopressin injection.
Results The von Willebrand factor and factor VIII concentrations in all dogs increased significantly and remained higher than base-line throughout the 2 h period.
Conclusion Desmopressin is useful in increasing von Willebrand factor concentrations in Greyhound blood donors, including those with low resting concentrations.     

箭筈豌豆混播黑麦草生物量和种间竞争的研究

对箭筈豌豆和一年生黑麦草不同混播比例的研究表明:混播的生物量高于单播,其积累模式为平稳增长型。在同一混播组合中,种间竞争力的强弱随着群落的发育而变化,在生育期间,黑麦草的竞争力高于箭筈豌豆。在不同混播比例中,随着黑麦草比例的增加,其种间竞争力呈下降趋势。一次性则割可获得较高的混播干物质产量,多次刈割可增加鲜草总产量,但不能提高干物质产量。     

竹木复合定向刨花板强度性能研究

本文论述了竹材、意大利杨复合定向刨花板的强度性能,就胶种、刨花厚度、竹材所占比率、板密度、板坯结构、施胶量等诸因子对板材强度性能的影响进行了探讨。结果表明:(1)胶种对竹木复合定向刨花板的强度影响不大;(2)降低刨花厚度或提高板密度均可使板材强度提高;(3)单层结构的复合定向刨花板强度最高;(4)提高板材中竹材的比率可使板子强度明显改善;但竹材比率过高时,板材强重比反而下降,呈开口向下的抛物线型变化;(5)酚醛树脂定向刨花板的强度随原料酸性增大而降低。     

Resistance to ACCase-inhibiting herbicides and isoproturon in UK populations of Lolium multiflorum: mechanisms of resistance and implications for control

Herbicide-resistant Lolium multiflorum (Italian rye-grass) was first reported in the UK in 1993 and had been confirmed on 25 farms by 1999. In this study, resistance to five herbicides belonging to the aryloxyphenoxypropionate, cyclohexanedione and phenyl-urea classes was determined in six populations of L multiflorum from the UK under glasshouse and simulated field conditions. Glasshouse conditions tended to exaggerate the degree of resistance, but experiments performed in both environments detected resistance in four populations of L multiflorum. Four populations (Essex A1, Lincs A1, Wilts B1, Yorks A2) were resistant to diclofop-methyl, fluazifop-P-butyl, tralkoxydim and partially resistant to isoproturon, but only the population from Yorkshire (Yorks A2) showed resistance to cycloxydim. Biochemical analyses of acetyl coenzyme A carboxylase (ACCase) activity, oxygen consumption by thylakoids, diclofop metabolism and glutathione S-transferase activity showed that, in three of the resistant populations, an enhanced rate of herbicide metabolism conferred resistance. This is the first report world-wide of an enhanced metabolism mechanism of diclofop resistance in L multiflorum. In the Yorks A2 population, an insensitive ACCase was detected (target-site resistance) which also conferred cross-resistance to all of the other ACCase inhibitors investigated.     

三品系西方蜜蜂基因组DNA多态性分析研究（二）

采用９种随机引物（Ｋ,５’－ＣＧＧＣＣＣＣＴＧＴ－３’;５’－ＣＡＧＣＧＧＴＡＣＣ－３’;５’－ＡＣＣＡＧＧＴＴＧＧ－３’,５’－ＧＴＣＧＧＡＡＴＴＣ－３’;５’－ＣＧＧＣＣＣＣＧＧＴ－３’;Ｘ,５’－ＧＴＡＧＴＣＡＣＡＣ－３’;Ｙ,５’－ＣＴＧＣＡＧＧＡＣＡ－３’;Ｚ,５’－ＣＧＧＣＣＣＧＧＴＡ－３’）和ＰＣＲ技术扩增不同产蜜量的三品系西峰（喀尼阿兰、平湖、美意的ＤＮＡ基因组。结果Ｋ引物在高产蜜     

苇状羊茅与多花黑麦草苗期耐盐性的差异

比较了不同海盐质量浓度 (以下简称浓度 ) ( 3 2 ,6 4 ,9 6 ,12 8,16 0g·L-1)灌水条件下砂培盆栽苇状羊茅(Festucaarundinacea)和多花黑麦草 (Loliummultiflorum)苗期的生长情况。结果表明 :低海盐浓度下 ,两种牧草的生长均未受到不良影响 ,海盐浓度大于 6 4g·L-1时 ,株高、鲜重、干重皆随浓度的增高呈下降趋势 ,苇状羊茅所受的影响大于多花黑麦草 ;与对照相比 ,两种牧草在海盐灌水条件下叶绿素含量增加 ,多花黑麦草相对增长率高于苇状羊茅 ;两种牧草茎叶中Na 含量均随海盐浓度的增高而升高 ;随灌水海盐浓度的升高苇状羊茅茎叶中K 含量降低 ,而多花黑麦草茎中K 含量增加 ;相同海盐浓度灌水条件下 ,多花黑麦草茎叶中K 、Ca2 含量高于苇状羊茅 ;两种牧草相比 ,多花黑麦草苗期的耐盐性高于苇状羊茅     

多花黑麦草根际微生物研究

采用选择性培养基平板梯度稀释培养,测定了不同肥力不同品种多花黑麦草(特高、长江2号和沃土)根际细菌、真菌、放线菌和三类促生细菌的数量,并根据真菌的培养形态和显微形态等,参考相关资料进行了真菌的分类和鉴定。结果表明:肥沃土壤中多花黑麦草根际细菌、真菌和放线菌及三类促生细菌的数量均高于贫瘠土壤;肥沃土壤中多花黑麦草不同品种间根际细菌、放线菌数量差异较大,而贫瘠土壤中多花黑麦草品种间差异不显著,不同肥力土壤中的真菌数量品种间均差异不显著。多花黑麦草根际三类促生细菌中溶磷细菌的数量最多,其次是自生固氮菌,硅酸盐细菌的数量最少;溶磷细菌中,有机磷细菌的数量远远多于无机磷细菌的数量。不同品种对根际微生物数量分布也有影响,不同品种间细菌和放线菌的数量差异较大,真菌数量差异不显著。从多花黑麦草根际分离到的真菌分别属于11个属,根际真菌的种类、多样性、丰富度、均匀度及优势度指数也随土壤肥力及品种不同而有差异。