骆驼常用药物的考察     

Ali.  BH  王新武 《动物医学进展》1989,(4):43-45

本文考察了常用于骆驼的一些抗寄生虫药、抗菌药和中枢神经系统抑制药的药理学、毒理学和治疗应用。骆驼对一些杀锥虫药的毒性作用显得比其它动物更敏感。  相似文献   

国外芦笋研究概述   总被引：3，自引：0，他引：3  

潘一山  王埔田 《福建热作科技》1989,(2):29-31,24

最近几年,芦笋的营养价值和药用功能不断被发掘,生产发展迅速,因此,对当前世界芦笋研究情况有必要作个回顾.一、芦笋发育生理的探讨英国加州曾对14个芦笋品种进行10年比较试验,认为芦笋产量主要取决于前三季的采收量,多数品种嫩茎产量与芦笋园环境条  相似文献   

Effects of the Antithyrotoxic Factor of Liver on Growth and Survival of Immature Rats Fed Massive Doses of Thyroactive Materials     

Ershoff BH  McWilliams HB 《Science (New York, N.Y.)》1948,108(2814):632-633

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A fossil noctuid moth egg from the late cretaceous of eastern north america     

Gáll LF  Tiffney BH 《Science (New York, N.Y.)》1983,219(4584):507-509

A moth egg assignable to the family Noctuidae (Lepidoptera) is described from 75-million-year-old sediments from Martha's Vineyard, Massachusetts. This sample, which extends the fossil record of this farnily and modern heteroneuran moths back to the Cretaceous, may provide insight into the coevolution of moths and flowering plants, as well as have implications for the evolution of bats.  相似文献   

Shoot culture dynamics of six Populus clones   总被引：1，自引：0，他引：1  

Sellmer JC  McCown BH  Haissig BE 《Tree physiology》1989,5(2):219-227

Shoot tips of five genotypically diverse Populus clones, P. alba x P. grandidentata 'Crandon,' P. nigra 'Betulifolia' x P. trichocarpa, P. nigra x P. laurifolia 'Strathglass,' P. maximowiczii x P. trichocarpa 'Androscoggin' and P. deltoides x P. nigra 'Eugenei,' were collected from hardwood cuttings, sterilized,and established in vitro. Stable shoot cultures were obtained from all clones except P. deltoides x P. nigra 'Eugenei'. The four poplar clones that formed stable shoot cultures together with a previously established P. tremula 'Erecta' clone were placed as two-node explants on either Murashige and Skoog medium or Woody Plant Medium containing benzyladenine to determine the rate of shoot multiplication, shoot growth and other responses of the clones. All five poplar clones showed rapid shoot multiplication when cultured in the presence of 0.4-1.0 microM benzyladenine on Murashige and Skoog medium, although P. tremula 'Erecta' produced a greater number of healthy shoots when grown on Woody Plant Medium. Individual shoot growth of all clones was more vigorous when the medium contained 0-0.1 microM benzyladenine, and 100% of such shoots rooted ex vitro.  相似文献   

Malaria     

Kean BH 《Science (New York, N.Y.)》1978,202(4371):970

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Diagnostic ophthalmology. Bilateral preganglionic Horner's syndrome     

Grahn BH  Mayer M  Sandmeyer LS 《The Canadian veterinary journal. La revue veterinaire canadienne》2007,48(5):537-538

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直墙拱形巷道围岩应力场分析     

唐治  潘一山  朱小景  崔乃鑫 《保鲜与加工》2015,(3):79-85

为得出直墙拱形巷道围岩应力分布规律,应用复变函数弹性理论推导了直墙拱形巷道围岩应力分布的解析表达式。对直墙拱形巷道边界的围岩应力和巷道水平线方向的围岩应力分布规律进行分析,并考虑直墙拱形巷道断面高宽比和侧压系数对其影响规律。研究表明：在不同巷道断面高宽比、侧压系数下,直墙拱形巷道围岩应力集中区域主要集中在直墙底部底角处、拱形顶板中点附近和底板中部3个位置。不同巷道断面高宽比下,直墙拱形巷道沿水平线的应力分布规律基本相同。侧压系数大于1时,采用巷道断面高宽比小于1较有利于巷道稳定;侧压系数小于等于1时,采用巷道断面高宽比大于1较有利于巷道稳定。  相似文献   

Cardiovascular effects of romifidine in dogs     

Pypendop BH  Verstegen JP 《American journal of veterinary research》2001,62(4):490-495

OBJECTIVE: To characterize the cardiovascular effects of romifidine at doses ranging from 5 to 100 microg/kg of body weight, IV. ANIMALS: 25 clinically normal male Beagles. PROCEDURE: Romifidine was administered IV at a dose of 5, 10, 25, 50, or 100 microg/kg (n = 5/group). Heart rate, arterial pressure, central venous pressure, mean pulmonary arterial pressure, pulmonary capillary wedge pressure, body temperature, cardiac output, and PCV were measured immediately prior to and at selected times after romifidine administration. Cardiac index, stroke index, rate-pressure product, systemic and pulmonary vascular resistance indices, and left and right ventricular stroke work indices were calculated. Degree of sedation was assessed by an observer who was blinded to the dose administered. RESULTS: Romifidine induced a decrease in heart rate, pulmonary arterial pressure, rate-pressure product, cardiac index, and right ventricular stroke work index and an increase in central venous pressure, pulmonary capillary wedge pressure, and systemic vascular resistance index. In dogs given romifidine at a dose of 25, 50, or 100 microg/kg, an initial increase followed by a prolonged decrease in arterial pressure was observed. Arterial pressure immediately decreased in dogs given romifidine at a dose of 5 or 10 microg/kg. CONCLUSIONS AND CLINICAL RELEVANCE: Results suggest that IV administration of romifidine induces dose-dependent cardiovascular changes in dogs. However, the 2 lowest doses (5 and 10 microg/kg) induced less cardiovascular depression, and doses > or = 25 microg/kg induced similar cardiovascular changes, suggesting that there may be a ceiling on the cardiovascular effects of romifidine.  相似文献   

Tyrosine Ameliorates Some of the Clinical,Biochemical and Haematological Effects of Acute Stress Associated with Transportation of Desert Sheep     

Ali BH  Al-Qarawi AA  Mousa HM  Mohammed SM 《Veterinary research communications》2001,25(6):503-510

We studied some clinical, biochemical and haematological variables in Desert (Najdi) sheep acutely stressed in the course of individual road transportation, and the influence thereon of pretreatment with tyrosine. Transportation for 30 min resulted in variable but statistically insignificant increases in heart, pulse and respiratory rates. It also caused significant increases in the plasma concentration of cortisol (from 43.5 to 101.7 mmol/L) and glucose (from 3.1 to 4.5 mmol/L), and a decrease in that of magnesium (from 0.85 to 0.72 mmol/L). The endogenous thiocyanate level was unaffected. The transportation stress also decreased the haematocrit (PCV) and the number of lymphocytes, and increased the concentration of haemoglobin. Pretreatment of sheep with tyrosine at a dose of 100 mg/kg by the intravenous route significantly ameliorated the stress-induced clinical, biochemical and haematological changes. The treatment caused no overt adverse effects.  相似文献