全文获取类型
收费全文 | 146046篇 |
免费 | 8147篇 |
国内免费 | 85篇 |
专业分类
林业 | 5452篇 |
农学 | 4369篇 |
基础科学 | 1029篇 |
16919篇 | |
综合类 | 25438篇 |
农作物 | 5437篇 |
水产渔业 | 7337篇 |
畜牧兽医 | 76132篇 |
园艺 | 1789篇 |
植物保护 | 10376篇 |
出版年
2018年 | 1825篇 |
2017年 | 1999篇 |
2016年 | 1889篇 |
2015年 | 1637篇 |
2014年 | 2008篇 |
2013年 | 5422篇 |
2012年 | 3829篇 |
2011年 | 4817篇 |
2010年 | 2970篇 |
2009年 | 3004篇 |
2008年 | 4726篇 |
2007年 | 4505篇 |
2006年 | 4371篇 |
2005年 | 4074篇 |
2004年 | 3962篇 |
2003年 | 3960篇 |
2002年 | 3890篇 |
2001年 | 4698篇 |
2000年 | 4543篇 |
1999年 | 3697篇 |
1998年 | 1463篇 |
1997年 | 1490篇 |
1996年 | 1395篇 |
1995年 | 1746篇 |
1994年 | 1579篇 |
1993年 | 1506篇 |
1992年 | 3151篇 |
1991年 | 3279篇 |
1990年 | 3325篇 |
1989年 | 3323篇 |
1988年 | 3051篇 |
1987年 | 3134篇 |
1986年 | 3224篇 |
1985年 | 3090篇 |
1984年 | 2609篇 |
1983年 | 2309篇 |
1982年 | 1575篇 |
1981年 | 1471篇 |
1980年 | 1431篇 |
1979年 | 2317篇 |
1978年 | 1909篇 |
1977年 | 1626篇 |
1976年 | 1441篇 |
1975年 | 1541篇 |
1974年 | 2075篇 |
1973年 | 2088篇 |
1972年 | 2056篇 |
1971年 | 1816篇 |
1970年 | 1713篇 |
1969年 | 1572篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
993.
D. Hoffman J. Amorim A. DeClue 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2018,32(1):208-216
Background
People with critical illness (CI) commonly develop various forms of immune dysfunction, however, there is limited information concerning immune dysfunction in dogs with CI.Hypothesis
The immune response in CI dogs differs from that of healthy dogs.Animals
Immunologic variables were compared between 14 dogs with CI, defined as APPLEfast score of >20 points, admitted to the University of Missouri Veterinary Health Center Small Animal Clinic Intensive Care Unit and healthy controls (n = 15).Methods
Cohort study evaluating constitutive and lipopolysaccharide (LPS)‐stimulated TNF‐α, IL‐6, and IL‐10 production, phagocytosis of opsonized E. coli and respiratory burst capacity after opsonized E. coli or phorbol 12‐myristate 13‐acetate (PMA) stimulation, peripheral blood lymphocyte phenotype, and monocyte expressions of HLA‐DR and TLR‐4.Results
Lipopolysaccharide‐stimulated leukocyte TNF‐α (median, Q1, Q3; CI, 49, 49, 120; control, 655, 446, 1174 pg/mL; P = < 0.001), IL‐6 (median, Q1, Q3; CI, 49, 49, 64; control, 100, 49, 166 pg/mL; P = 0.029), and IL‐10 (CI, 49, 49, 56; control, 96, 49, 203 pg/mL; P = 0.014) production and both E. coli (median, Q1, Q3; CI, 60.5, 43, 88.5; control, 86.6, 81, 89.2%; P = 0.047) and PMA (CI, 40, 11.7, 70; control, 93, 83, 97.6%; P = < 0.001)‐stimulated respiratory burst capacity significantly decreased in CI dogs. Percentage of monocytes expressing TLR‐4 greater in the CI dogs (median, Q1, Q3; CI, 46.9, 24.3, 64.2; control, 16.4, 9.4, 26.2%; P = 0.005).Conclusion
These findings suggest dogs with CI develop immune system alterations that result in reduced respiratory burst function and cytokine production despite upregulation of TLR‐4. 相似文献994.
Evaluation of Serum Symmetric Dimethylarginine Concentration as a Marker for Masked Chronic Kidney Disease in Cats With Hyperthyroidism 下载免费PDF全文
995.
996.
A. Lecoindre D. Saade P. Barthez J. L. Cadoré P. Lecoindre 《The Journal of small animal practice》2018,59(5):311-314
A one‐year‐old female cocker spaniel presented with a 6‐month history of persistent diarrhoea. Abdominal ultrasonographic examination revealed mild diffuse thickening of the intestinal wall coupled with mesenteric lymphadenopathy. A connection between the duodenum and the colon was observed during an endoscopic procedure and confirmed by computed tomography. Surgical resection of the communication allowed remission of the diarrhoea. Histology showed a normal duodenal epithelium and muscular layer. A duodenocolic fistula is an abnormal connection within the digestive tract, which in humans is usually considered a complication of a local pathological condition. Due to the absence of a predisposing cause and, in view of the dog's age and histological results, a congenital origin was suspected. 相似文献
997.
Oronasal fistula development is described anecdotally as a common disease process in the dachshund but little is known about its imaging appearance. This case report describes the clinical presentation, computed tomography (CT) characterisation, dental radiograph confirmation and treatment of bilateral oronasal fistulas in a 14‐year‐old dachshund. 相似文献
998.
999.
1000.