首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   560篇
  免费   28篇
林业   45篇
农学   15篇
基础科学   2篇
  102篇
综合类   71篇
农作物   10篇
水产渔业   21篇
畜牧兽医   287篇
园艺   2篇
植物保护   33篇
  2021年   6篇
  2020年   7篇
  2019年   7篇
  2018年   11篇
  2017年   11篇
  2016年   10篇
  2015年   8篇
  2014年   9篇
  2013年   17篇
  2012年   13篇
  2011年   22篇
  2010年   13篇
  2009年   14篇
  2008年   17篇
  2007年   12篇
  2006年   13篇
  2005年   10篇
  2004年   17篇
  2003年   17篇
  2002年   13篇
  2001年   9篇
  2000年   8篇
  1999年   9篇
  1998年   10篇
  1997年   6篇
  1996年   13篇
  1994年   8篇
  1992年   10篇
  1991年   17篇
  1990年   7篇
  1989年   18篇
  1988年   9篇
  1987年   16篇
  1986年   14篇
  1985年   19篇
  1984年   15篇
  1981年   6篇
  1979年   7篇
  1977年   6篇
  1975年   7篇
  1974年   8篇
  1973年   7篇
  1972年   16篇
  1971年   5篇
  1970年   9篇
  1969年   5篇
  1967年   5篇
  1966年   4篇
  1948年   7篇
  1900年   4篇
排序方式: 共有588条查询结果,搜索用时 828 毫秒
71.
The objective of this study was to evaluate the safety and efficacy of a purified porcine insulin zinc suspension for treating dogs with uncomplicated diabetes mellitus. Fifty-three dogs were treated for 60 days after an initial dose determination period. The means of the blood glucose concentrations during 12-hour glucose curves and the means of the blood glucose nadir concentrations during 12-hour glucose curves for all dogs were determined before beginning insulin therapy (time 0), at the end of the dose determination period (time 1), 30 days after time 1 (time 2), and 60 days after time 1 (time 3). Presence of polyuria, polydipsia, and ketonuria was determined at each time point. Adequacy of control of hyperglycemia was based on 12-hour blood glucose curves and improvement in clinical variables (results of physical examinations, historic information, polyuria, polydipsia, and ketonuria). Safety was evaluated by questionnaire, performance of physical examination, CBC, serum chemistry profile, and urinalysis. The means of the blood glucose concentrations during 12-hour glucose curves and the means of the blood glucose nadir concentrations during 12-hour glucose curves for all dogs at times 1, 2, and 3 were significantly lower compared with time 0 (P < .0001). There was a reduction in the proportion of dogs with polyuria, polydipsia, and ketonuria of 82, 86, and 80%, respectively. All of the dogs had adequate glycemic control at time 1, 66% at time 2, and 75% at time 3. At time 3, 66% of dogs required insulin injections q12h. Other than hypoglycemia, there were no important adverse effects of insulin administration. The insulin, was safe and efficacious for reducing blood glucose and clinical signs in dogs with diabetes mellitus.  相似文献   
72.
73.
74.
75.
76.
77.
Hemostatic profiles were evaluated in 15 healthy dogs immediately before and 24 hours after celiotomy for routine ovariohysterectomy. Prothrombin time, activated partial thromboplastin time, fibrinogen, fibrin degradation products, antithrombin III activity, platelet count, and hemogram were measured. There were no significant changes in prothrombin time, activated partial thromboplastin time, fibrin degradation products, antithrombin III activity, or platelet count. Fibrinogen concentration was significantly higher following surgery. Postoperative leukocyte differential counts were typical of stress leukograms, and were characterized by leukocytosis, neutrophilia, lymphopenia and eosinopenia. Mild decreases in packed cell volume, red blood cell count and hemoglobin concentration were consistent with minor blood loss during surgery or fluid retention and hemodilution postoperatively. It was concluded that celiotomy and routine ovariohysterectomy in healthy dogs did not alter hemostatic profiles 24 hours after surgery. Abnormal postoperative hemostatic profiles should not be attributed to surgery alone; other causes of abnormal hemostatic profiles should be investigated.  相似文献   
78.
79.
80.
In 26 cows with surgically corrected torsio uteri intra partum, severity of disease, wound healing and secondary diseases were correlated with plasma haptoglobin concentration. The objective of the investigation was to determine, if an increased plasma haptoglobin concentration indicates the severity of disease respectively expected wound healing disorders or secondary diseases. The degree of severity of disease was determined by rectally diagnosed elasticity of the uterus before the surgery. In the present investigation, the severity of a uterine torsion intra partum could not be evaluated by determining the plasma haptoglobin concentration. In 9 of 11 days of investigation there was no significant difference in the plasma haptoglobin concentration of animals with an elastic uterus (animals with good prognosis) in contrast to cows with tight uterus (patients with poor prognosis) found. The significant differences on the 6th and 7th day post surgery are related to secondary diseases in patients with poor prognosis, which develop evidently earlier and form stronger. The correlation of all cows with--to those without secondary illnesses shows, that 10 days post surgery patients with secondary diseases have a significant higher plasma haptoglobin concentration (p < 0.05) compared to animals without secondary illnesses. No correlations existed between plasma haptoglobin concentration and wound healing in the examined cattle. A postoperatively increase of haptoglobin indicates a higher risk of secondary illnesses and complications.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号