遗传算法在离心泵叶片优化设计中的应用   总被引：2，自引：3，他引：2  

闫永强  梁武科 《排灌机械》2004,22(2):5-7

对遗传算法在流体机械优化设计中的应用现状作了较为全面的总结；提出了将遗传算法应用于离心泵叶片优化设计中，分析了遗传算法在离心泵优化设计中应用的可行性以及存在的问题；对离心泵优化设计的发展提出了一些新建议和尝试。  相似文献   

The Nutrient Quality of Cassava by Addition of Cow Rumen Fluid Enzyme     

S. Sandi  E. B. Laconi  A. Sudarman  K. G. Wiryawan  D. Mangunwijaja 《农业科学与技术》2011,(8):1122-1125

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反相高效液相色谱法测定瘤胃液中的生物胺     

王东升  霍文婕  朱伟云  毛胜勇 《动物营养学报》2011,(12):2165-2169

本文旨在应用反相高效液相色谱法建立瘤胃液中生物胺的测定方法.样品经0.5 mol/L盐酸提取后,用丹磺酰氯柱前衍生,流动相为乙腈和0.1 mol/L乙酸铵溶液；采用梯度洗脱,流速为1.0 mL/min；紫外检测器波长254 nm,柱温30℃.应用该方法,研究高精料和低精料饲粮条件下瘤胃液中5种生物胺浓度的差异.结果表明...  相似文献   

超临界流体萃取技术在农药残留分析中的应用进展   总被引：12，自引：2，他引：12  

阮长青  叶非 《农药科学与管理》2001,22(4):20-22

从萃取过程控制的角度，综述了近几年来国外超临界流体技术不同形态的基体的农药残留分析中的应用情况、研究现状及前景。  相似文献   

The induction of 1,3-β-glucanases and other enzymes in groundnut leaves infected with Cercospora arachidicola     

S. Roulin  A. J. Buchala 《Physiological and Molecular Plant Pathology》1995,46(6)

Infection of groundnut leaves with the early leaf spot pathogen Cercospora arachidicola leads to a marked increase in extracellular 1,3-β-glucanase activity, limited to the infected tissue. Three isoforms of low molecular weight and extreme pI values, typical of pathogenesis-related proteins, were induced. These β-glucanases, when acting together, were capable of degrading the pathogen cell wall in vitro. Glucanases from homogenates of infected leaf tissue were partially purified by ion-exchange chromatography to give enzymes with molecular weights of 35, 32 and 20 kDa and pI values of 3·8, 3·6 and > 9, respectively. They were electrophoretically identical to the β-glucanases found in the intercellular washing fluid. Treatment of groundnut plants with 200 μM mercuric chloride induced the accumulation of identical extracellular β-glucanases. During the course of the infection an increase in peroxidase activity was also observed, but chitinase activity remained more or less constant.  相似文献   

丹参注射液实验性药效作用     

甘志华  刘文福 《湖南农业大学学报(自然科学版)》1992,(1)

实验结果表明,丹参注射液分别在3×10~(-3)g/ml和6×10~(-3)g/ml浓度时,小白鼠子宫活动呈轻度弛缓,记录图形波谷略下延,收缩间隔延长,子宫活动较用药前有明显差别(P<0.05);妊娠小白鼠每只一次皮下注射0.2 mI丹参注射液,每日1次,连续3次,试期无一例发生流产,妊娠鼠均产下健康乳鼠;用妊娠山羊作同样实验(山羊体重30kg左右,每次每只皮下注射10ml丹参液,约含生药10g,每日1次,连续3次),同样无一例发生流产,妊娠期满顺利产下健康羊羔;丹参注射液离体兔耳灌流后,兔耳皮肤血管短暂徼弱扩张,但用药前后流量变化差异不明显(P>0.05)。  相似文献   

Influence of Boar Seminal Plasma on the Distribution of Spermatozoa in the Genital Tract of Gilts     

Sven Viring  Stig Einarsson 《Acta veterinaria Scandinavica》1980,21(4):598

The main purpose of the present study was to investigate whether boar seminal plasma affects the transport of spermatozoa in the genital tract of oestrous pigs or not, with special reference to the sperm transport into the oviducts. Altogether 17 gilts were used in three experiments.Experiment I. In nine gilts one uterine horn was injected surgically with 10¹⁰ spermatozoa suspended in seminal plasma and the other uterine horn with 10¹⁰ spermatozoa suspended in TESNaK-glucose buffer solution. The sperm deposition was performed under general anaesthesia. The gilts were slaughtered 1–2 or 4–6 h after insemination. The genital tract was removed and the numbers of spermatozoa determined in oviducts and in uterine horns.Experiment II. The insemination doses were prepared exactly as in Experiment I. Approx. 24 h before insemination Polyvinylchloride cannulas were inserted into the uterine lumen of the horns, drawn via the midventral incision at linea alba subcutaneously to cutaneous incisions ventral to the vulva opening. One cannula was placed in each uterine horn. At standing heat the insemination doses were slowly injected through the cannulas. The gilts were slaughtered 1 h after insemination and the numbers of spermatozoa within the genital tract were counted.Experiment III. In three gilts under general anaesthesia the uterine horns were ligated 10 cm from the uterotubal junction. The semen doses (containing 2 × 10⁹ spermatozoa), prepared as in Experiment I, were deposited into the uterine horns anterior to the ligatures through a cannula. The gilts were slaughtered 1 h after insemination, and the numbers of spermatozoa within the oviducts and ligated part of the uterine horns were counted.In all three experiments more spermatozoa were, on average, recovered in the oviducts connected to uterine horns inseminated with spermatozoa suspended in seminal plasma. In Experiments I andII this was the case for 10 of 14 gilts and in Experiment III for all the three gilts. It is therefore suggested that boar seminal plasma pro¬motes sperm transport into the oviduct of oestrous pigs. The back¬ground mechanism for this is discussed.  相似文献   

A comparison of the cytologic and histologic features of meningiomas in four dogs     

Zimmerman KL  Bender HS  Boon GD  Prater MR  Thorn CE  Prater D  Robertson JL  Saunders GK  Sponenberg DP  Inzana KD  Lanz OI  Wright E 《Veterinary clinical pathology / American Society for Veterinary Clinical Pathology》2000,29(1):29-34

Abstract: The cytologic and histologic features of 2 intracranial and 2 spinal (extramedullary cervical) canine meningiomas were compared. Cerebrospinal fluid analysis in 2 cases revealed mild, mixed cell pleocytosis, primarily composed of small lymphocytes and monocytoid cells, with a moderate increase in total protein concentration. Cytologic features suggestive of meningioma included cells with both epithelial and mes-enchymal characteristics and a tendency towards cell clustering. Tumor location also was useful in making a diagnosis. The 4 meningiomas differed histologically from one another, and included angioblastic, psam-momatous, meningotheliomatous, and microcystic anaplastic types, which conformed to a classification scheme for human meningiomas. The classification scheme could not be applied to cytologic specimens.  相似文献   

不同日粮组成对断奶初期奶公犊瘤胃内环境指标的影响     

陈宁  尹君亮  刘福元  李国庆  宋志强  孟季蒙 《家畜生态》2006,(6)

选用3头三月龄左右装有瘤胃瘘管的荷斯坦奶公犊,按3×3完全拉丁方试验设计,喂给三种日粮。日粮组成按精粗比分别表示为:70:30;60:40;50:50,研究不同日粮组成对断奶初期奶公犊瘤胃内环境指标包括pH值、氨氮(NH3-N)浓度、纤毛虫数量及微生物蛋白的影响。试验结果表明:精粗比为70:30日粮条件下奶公犊瘤胃内pH值显著低于其它组(P<0.01),70:30日粮组瘤胃内NH3-N浓度显著高于精粗比为60:40和50:50日粮(P<0.01)。不同日粮组成下精粗比为60:40和50:50日粮的瘤胃纤毛虫数量和微生物蛋白显著高于高精料组70:30日粮(P<0.01)。  相似文献   

超临界萃取技术及其在蜂产品加工中的应用   总被引：3，自引：0，他引：3  

颜伟玉李琳  谢国秀 《养蜂科技》2006,(1):36-37,35

本文简要介绍了超临界萃取技术及其在蜂产品提取中的应用。  相似文献