坡耕地地表糙度的量测与计算

在回顾了地表糙度的测量和计算方法后,经实验证实,Brough D L,Linden D R和Van Doren D M等人提出的糙度测量和计算方法,均能满足黄土高原坡耕地人为耕作管理形成的微地形特征的研究需求。     

土壤—作物资源多目标优化配置分析

本文提出一种多目标土壤—作物资源优化配置的数量化分析方法,并对江苏省东海县土壤资源进行优化配置。结果表明：白浆土、岭砂土、包浆土、紫砂土等岗岭低产土应稳定小麦面积,压缩玉米面积,优先发展春花生、大豆、水稻;洼地砂姜黑土、水稻土应发展小麦—水稻和小麦—玉米两熟制,并适时换茬;介于上述两类土壤间的潮棕壤亚类和潮土类应大力发展小麦—花生两熟制。     

丛枝菌根真菌诱导玉米根系形态变化及其机理

以高油115和正大619为实验材料,分别通过盆栽和田间试验研究接种摩西球囊霉和地表球囊霉对玉米根系形态和根系内源生长素含量的影响。结果表明,玉米形成菌根后根系形态明显改变,根条数显著多于对照,并且接种处理与对照间的差异随菌根侵染率的上升而加大,差异极显著。生长60 d时,有菌根的玉米单株总根长度为788.61 cm,根系重量达8.26 g,均显著高于无菌根的对照。根系生长素含量随菌根侵染率上升而增加,并且显著高于不接种的对照。丛枝菌根真菌侵染可以促使玉米根内生长素含量上升,根条数增多,增加吸收面积,促进玉米生长。     

Mise en évidence de l'expression du virus leucémogène bovin (BLV) dans les lymphocytes de mouton par une technique d'immunofluorescence utilisant des anticorps monoclonauxDetection of bovine leukemia virus (BLV) in sheep lymphocytes by immunofluorescencence test using monoclonal antibodies

An indirect immunofluorescence (IF) test was developed to detect bovine leukemia virus (BLV) antigen expression in infected sheep lymphocytes, using monoclonal antibodies anti BLV-major envelope glycoprotein gp51. Peripheral blood lymphocytes were cultivated for 48 h in presence of phytohemagglutinin (PHA) (50 μg/ml), and then fixed with acetone. The cells were assayed for the IF test. All experimentally infected sheep were positive with this test.     

Equine chronic diarrhea: Traditional Chinese veterinary medicine review

Chronic diarrhea is a common problem in equine practice. Herbal medicine has been used for the treatment of gastrointestinal disease in horses for at least one thousand years. In present-day equine practice in China, the most common approach to treat chronic diarrhea is herbal medicine, or a combination of herbal medicine and acupuncture. Three types of chronic diarrhea in horses will be described in detail in term of symptoms, diagnosis and herbal treatments in this paper. Nineteen herbal formulas for treatment of different types of diarrhea will be introduced. Clinical results of each herbal formula will be evaluated. Acupuncture treatment of this problem will also be included.     

A distinct Mendelian autosomal recessive syndrome involving the association of anotia, palate agenesis, bifid tongue, and polydactyly in the dog.

A presumed genetic syndrome is described in a family of St. Bernards. Four identically affected littermates presented the association of palate agenesis, anotia, incomplete bifid tongue, preaxial hind paw polydactyly, and an extra thoracic vertebra and rib. Pedigree analysis is compatible with an autosomal recessive gene.     

A comparison of the clinical field efficacy and safety of florfenicol and tilmicosin for the treatment of undifferentiated bovine respiratory disease of cattle in western Canada.

We compared the field efficacy of a new antibiotic, florfenicol, with tilmicosin in the treatment of naturally occurring undifferentiated bovine respiratory disease. Beef calves with rectal temperatures greater than 40.5 degrees C and signs compatible with undifferentiated bovine respiratory disease were entered into the trial. Calves were randomly assigned to receive either florfenicol (20 mg/kg bodyweight intramuscularly; 2 injections 48 h apart) or tilmicosin (10 mg/kg bodyweight subcutaneously; 1 injection). Clinical measures of efficacy included mortality, rectal temperature, illness index score, assessment of treatment success or failure, and the number of relapses or reinfections. Performance was assessed based on weight gains from day 0 to day 90. Two hundred and twenty calves entered the trial; 112 received florfenicol and 108 received tilmicosin. Seventeen deaths occurred between day 0 and day 90, but only 10 during the 28-day trial period. Seven calves receiving tilmicosin died, compared with 3 receiving florfenicol (P = 0.20). Of the 220 initial treatments, 45 (20%) were categorized as treatment failures; 27 in the tilmicosin group and 18 in the florfenicol group (P = 0.10). The number of calves experiencing a 2nd relapse was significantly different, with 17 of 30 (57%) calves on tilmicosin compared with 7 of 26 (27%) calves on florfenicol relapsing at least twice (P = 0.02). Average daily gains over 90 days were 1.55 kg/day for florfenicol-treated calves and 1.51 kg/day for tilmicosin-treated calves. No significant adverse reactions were noticed with either drug. Results indicate that florfenicol and tilmicosin are comparable in the treatment of undifferentiated bovine respiratory disease in western Canada.     

盐分浓度对星星草种子萌发的影响

星星草（Ｐｕｃｃｉｎｅｌｌｉａｔｅｎｕｉｆｌｏｒａ）种子经不同浓度ＮａＣｌ溶液处理结果表明；与对照相比，低于０．６ｇ／１００ｍｌ的盐浓度对种子萌发有促进作用；介于０．７ｇ／１００ｍｌ—３．６ｇ／１００ｍｌ间，种子的萌发势和累积发芽率显著下降，但尚不影响其萌发潜势，解除盐分限制后，还可正常萌发；高于３．７ｇ／１００ｍｌ后，不仅抑制种子萌发，并对其萌发潜势有显著影响。