金针菇品种比较试验     

高经典  罗孝坤 《中国食用菌》1993,13(6):13-15

１９９１年１０月至１９９３年７月，笔者用Ｃｏ－２７等１２个菌株做了四批十二次金针菇品种比较试验，菌株Ｃｏ－２７比优良品种三明一号，Ｆ９０８分别增产１４．２６％和１２．３９％，差异显著性测验表明，它们之间的差异均达到了显著程度；Ｃｏ－２６，Ｃｏ－１４，Ｃｏ－２３，Ｃｏ－１５，Ｃｏ－２４，Ｃｏ－１３等菌株与两个对照品种相比，其产量都有不同程度的提高，除Ｃｏ－２５之外，各菌株之间菌丝生长速度没有表现出显  相似文献   

COLLAGENASE CHEMONUCLEOLYSIS—A LONG TERM RADIOGRAPHIC STUDY IN NORMAL DOGS     

Matthew A.O.  Atilola  DVM  PhD  Joanne R.  Cockshutt  DVM  MS  Ron  Mclaughlin  DVM  DVSc  Susan M.  Cochrane  DVM  DVSc  Paul W.  Pennock  DVM  MS 《Veterinary radiology & ultrasound》1993,34(5):321-324

Five clinically normal five year old dogs were used in this study. From a randomised table inter ver tebral discs were each injected with either collagenase or calcium chloride diluent. The surgically exposed cervical discs were injected with 50 units whereas thoracic and lumbar discs were injected under fluoroscopic guidance with 100 units of the enzyme. Postinjection radiographs revealed significant (p ≤ .05) disc space narrowing in enzyme injected discs. The cervical discs had the highest frequency of radiographic narrowing (87%) followed by the thoracic (70%) and lumbar (53%) discs. Spondylosis deformans developed at the sites of cervical enzyme injections. None of the dogs had neurologic abnormalities one year postinjection.  相似文献   

吡喹酮和硝硫氰醚对日本血吸虫体内5-HT含量的影响     

余祖功  包鸿俊 《动物医学进展》2002,23(5):82-83

本文研究了吡喹酮和硝硫氰醚与日本血吸虫拟似神经递质 5-羟色胺间的关系。以吡喹酮 ( 5× 1 0 - 7mol/ L和 5× 1 0 - 8mol/ L )、硝硫氰醚 ( 1 0 - 4mol/ L和 1 0 - 5mol/ L )分别培养日本血吸虫成虫 4h和 8h ,反相离子对高效液相法测定其体内 5-HT的含量变化。结果显示 :吡喹酮和硝硫氰醚对日本血吸虫体内 5-HT等含量的影响与对照相比均无显著性差异。表明二者抗虫作用似不通过影响虫体 5-HT的生物合成和降解。  相似文献   

微生物谷氨酰胺转胺酶(MTG)分批发酵模型的建立     

高红亮  刘海涛  周波  常忠义  吉国栋 《山东农业大学学报(自然科学版)》2006,37(4):557-560

在本文中，以本实验优化好的工艺条件，建立了关于微生物谷氨酰胺转胺酶分批发酵的数学模型方程细胞生长的动力学方程、产物合成的动力学方程和底物消耗的动力学方程。并对所建立的动力学方程进行了生物统计分析，结果表明所建立的模型具有一定的可信度。  相似文献   

Growth,Meat Yield,and Economic Responses of Broilers Provided Three- and Four-Phase Schedules Formulated to Moderate and High Nutrient Density During a Fifty-Six-Day Production Period     

《The Journal of Applied Poultry Research》2006,15(2):312-325

This study examined growth responses and meat yield of broilers provided a 3- or 4-phase feeding schedule formulated to moderate or high nutrient density. Four dietary treatments were implemented consisting of high or moderate nutrient density diets that were provided for the duration of 3 phases (1 to 17, 18 to 35, and 36 to 56 d) or 4 phases (1 to 17, 18 to 35, 36 to 46, and 47 to 56 d).Provision of a 3-phase schedule did not alter growth performance, meat yield, or diet cost per final BW. Broilers receiving high nutrient diets had improved growth rate and feed conversion from 1 to 35 d. In the 3-phase schedule, birds given the high nutrient density diets had advantages in BW gain and pectoralis minor breast weight. Market changes in meat prices impact differences in gross feeding margins between diets formulated to high or moderate nutrient density more than variation in diet cost.  相似文献   

应用种间杂交方法进行谷子抗除草剂育种的初步研究     

马金丰 《黑龙江农业科学》2005,(2):18-20

野生青狗尾草与中国栽培谷子进行杂交,并用浸有氟特力溶液的小培养皿进行发芽试验,快速鉴别F2代的抗除草剂性能。抗性被隐性基因控制,但更确切的结果有待进一步试验。氟特力不同用药量的选择试验表明,对氟特力抗性与敏感不同的谷子品种在 0~2.4 L/hm2 的处理表现不同,抗型品种的抗性大约是敏感型抗性的5倍。为我们选育谷子抗性新品种提供了依据。  相似文献   

Ei及Ei Compendex Web数据库检索方法     

刘顺昌 《农业图书情报学刊》2004,15(7):66-68

介绍了美国《工程索引》的概况及各种版本形式，并对其中的Ei Compendex Web数据库的检索方法进行了详细介绍。  相似文献   

Photosynthate Unloading from Seed Coats of Phaseolus vulgaris L. an Attempt to Define Conditions Required for Stimulation by Abscisic Acid and Benzylamino Purine     

John W.PATRICK 《浙江大学学报(农业与生命科学版)》1990,(4)

The instablity of the stimulation of photosynthate unloading from seed coats of Phaseolus vulgaris by abscisic acid (ABA ) and benzylamino purine ( BAP ) was studied in terms of experimental conditions. ABA stimulated photosynthate unloading at pH 6 and pH 8 without close dependence upon pH. ABA at a concentration range of 10-5-10-4 mol/L displayed stimulatory effect. However, BAP revealed no effect at a concentration range of 10-6-10-4 mol/L. Experiments designed with different transport time of 14C-photosynthate indicated that ABA might act at the plasma membrane of the unloading cells. Reducing endogenous ABA level by diminishing leaf area did not facilitate the manifestation of exogenous ABA function. Potassium ion stimulated photosynthate unloading from seed coats with highest promotion at 100 mmol/L K . However, no dependence of ABA stimulation of photosynthate unloading on K was found.  相似文献   

夏直播花生规范化栽培密度与氮肥优化配置研究   总被引：1，自引：0，他引：1  

李伟锋  张保亮  何延成  王海红  张梅 《花生学报》2004,33(3):37-40

采用二次饱和D—最优设计建立了密度和N肥用量与夏直播花生产量的数学模型。进一步分析表明，密度与N肥用量呈负交互效应，肥料用量增加，花生密度可适当减少。密度与N肥用量的最优组合为每公顷播15．36万穴，施纯N99．6kg，最高产量可达到5527．0kg。公顷产量在4500~5527kg范围内的措施组合为：每公顷播15．O～18．7万穴，施纯N65．1～124．4kg。  相似文献   

巨峰葡萄晚秋叶施^15N—尿素的吸收,运转,贮藏和再分配   总被引：20，自引：2，他引：18  

管长志  曾骧S 《园艺学报》1993,20(3):237-242

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