全文获取类型
收费全文 | 87322篇 |
免费 | 5188篇 |
国内免费 | 42篇 |
专业分类
林业 | 2978篇 |
农学 | 2711篇 |
基础科学 | 526篇 |
9925篇 | |
综合类 | 16202篇 |
农作物 | 3656篇 |
水产渔业 | 4304篇 |
畜牧兽医 | 45554篇 |
园艺 | 1082篇 |
植物保护 | 5614篇 |
出版年
2019年 | 807篇 |
2018年 | 1193篇 |
2017年 | 1377篇 |
2016年 | 1292篇 |
2015年 | 1145篇 |
2014年 | 1361篇 |
2013年 | 3453篇 |
2012年 | 2557篇 |
2011年 | 3040篇 |
2010年 | 1979篇 |
2009年 | 1947篇 |
2008年 | 2935篇 |
2007年 | 2837篇 |
2006年 | 2689篇 |
2005年 | 2536篇 |
2004年 | 2384篇 |
2003年 | 2412篇 |
2002年 | 2276篇 |
2001年 | 2904篇 |
2000年 | 2782篇 |
1999年 | 2268篇 |
1998年 | 975篇 |
1997年 | 893篇 |
1996年 | 790篇 |
1995年 | 957篇 |
1994年 | 863篇 |
1993年 | 857篇 |
1992年 | 1812篇 |
1991年 | 1813篇 |
1990年 | 1753篇 |
1989年 | 1816篇 |
1988年 | 1571篇 |
1987年 | 1680篇 |
1986年 | 1739篇 |
1985年 | 1667篇 |
1984年 | 1313篇 |
1983年 | 1167篇 |
1982年 | 842篇 |
1981年 | 723篇 |
1979年 | 1109篇 |
1978年 | 900篇 |
1977年 | 781篇 |
1976年 | 735篇 |
1975年 | 810篇 |
1974年 | 999篇 |
1973年 | 1041篇 |
1972年 | 994篇 |
1971年 | 947篇 |
1970年 | 887篇 |
1969年 | 812篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
951.
Humblet MF Walravens K Salandre O Boschiroli ML Gilbert M Berkvens D Fauville-Dufaux M Godfroid J Dufey J Raskin A Vanholme L Saegerman C 《Research in veterinary science》2011,91(2):199-207
The present study aimed to monitor skin test practices as performed by veterinarian field practitioners in Belgium. For this purpose, an anonymous postal questionnaire was elaborated and dispatched to veterinarians involved in bovine tuberculosis detection. The questionnaire included items focusing on the skin test performance. International experts in the field of bovine tuberculosis were asked to fill the questionnaire and a scoring scale was built as follows: 0 = ‘ideal’ answer, 1 = acceptable answer, whereas 2 = unacceptable answer. Furthermore, experts were asked to rank the questionnaire’s items according to their possible impact on the risk of not detecting reactors. A global score was further calculated for each participant and a comparison of practices was carried out between the two regions of the country, i.e. Wallonia and Flanders. Significant differences were observed between both regions, a harmonization at the country level is thus essential. No veterinarian summed a null score, corresponding to the ideal skin test procedure, which suggests that skin-testing is far from being performed correctly. Field practitioners need to be sensitized to the importance of correctly performing the test. The authors recommend the questionnaire is suitable for application in other countries or regions. 相似文献
952.
C F Burrows A M Merritt A M Chiapella 《Journal of the American Veterinary Medical Association》1979,174(1):62-66
Quantitative fat and trypsin analysis was done on the feces of dogs with chronic diarrhea. The results of clinical examination, quantitative fecal analysis, and other laboratory tests permitted assignment of the dogs into one of 4 groups: (1)pancreatic exocrine insufficiency,(2)small intestinal malabsorption,(3)colitis, and(4)other nonspecific or incompletely diagnosed diarrhea. The mean 24-hour fat output was significantly higher (p less than 0.01) in dogs with malabsorption or pancreatic insufficiency than in clinically normal dogs, dogs with colitis, or dogs with nonsteatorrheic diarrheas. The mean 24-hour trypsin output with pancreatic insufficiency was significantly (P less than 0.01) lower, and in dogs with malabsorption, significantly (P less than 0.05) higher than in clinically normal dogs. Normalization of the output data for body weight enhanced the value of fat and trypsin analyses in the differentiation of pancreatic insufficiency and intestinal malabsorption from other causes of chronic canine diarrhea. 相似文献
953.
Cattle on 18 of 21 farms in north-east Scotland were found to have low whole blood activities of the selenium-containing enzyme, glutathione peroxidase (less than 5 units per ml whole blood), and a low blood concentration of selenium (less than 0.05 mg per litre). These cattle had all been fed on locally produced feedstuffs without any mineral supplementation. The low selenium status in cattle occurred on farms with soils derived from a range of parent material, no one particular type predominating. 相似文献
954.
Fifty-one dairy cows were examined three times at weekly intervals during weeks 5 to 7 after calving. Rectal palpation of the ovaries and plasma progesterone assay were used to determine cyclic ovarian function. Eight of 51 cows exhibited true anoestrus by day 49 after calving. Only 23 of 43 cycling cows were served by day 77, the end of the target period for first service. In 77 per cent of 142 examinations, rectal palpation and progesterone assay gave compatible results. Most incompatibility occurred early or late inthe cycle, or in association with cystic structures in the ovaries. Eleven of the 51 cows had cysts in the ovaries but cyclicity and fertility were not adversely affected. 相似文献
955.
956.
M C Smith 《Journal of the American Veterinary Medical Association》1979,174(12):1328-1332
Of six goats with polioencephalomalacia, three responded to thiamin therapy, whereas three died 2 to 7 days after onset of signs. The goats were 2 months to 2 1/2 years old. They were affected during the winter or early spring, and concentrate feeding was a prominent part of the history. Transketolase activity values were obtained from two affected goats and from nine controls. The affected goats had lower transketolase activity than any of the controls. 相似文献
957.
958.
A M Pope J E Heavner J A Guarnieri C P Knobloch 《Journal of the American Veterinary Medical Association》1986,189(7):781-783
The neuroteratogenicity of trichlorfon was evaluated in 3 groups of pregnant sows (8/group). The treatments were: control (no trichlorfon), trichlorfon (60 mg/kg of body weight) in the feed only on day 55 of gestation, or trichlorfon (60 mg/kg of body weight) in the feed on day 55 and day 70 of gestation. One week after farrowing, all newborn pigs were removed from the sows and were euthanatized. Brain and cerebellum weights of the newborn pigs were recorded. Mean cerebellum weights and cerebellum/total brain weight ratios of the neonatal pigs were 3.780 and 0.106 (group 1, n = 26), 3.183 and 0.098 (group 2, n = 42), and 2.986 and 0.088 (group 3, n = 61). Although trichlorfon interfered with cerebellar development and the severity of the trichlorfon-induced cerebellar hypoplasia was dosage-related, ataxia did not develop in the neonatal pigs. 相似文献
959.
Ten dairy cows were infused intramammarily near drying off with concanavalin A (conA) or phytohemagglutinin (PHA). Mammary secretions were collected during physiologic transitions of the udder and were used in an in vitro microbiological assay to determine growth inhibition of mastitis pathogens. As mammary involution progressed, in vitro growth inhibition of Klebsiella pneumoniae, Escherichia coli, and Streptococcus uberis increased. Mammary secretions from conA- and PHA-treated glands had significantly increased bacterial growth inhibition. Secretions contained significantly increased concentrations of lactoferrin and a decreased citrate:lactoferrin molar ratio earlier in the dry period than did control mammary secretions. Greatest bacterial growth inhibition was observed in mammary secretions obtained 7 days before parturition. However, differences in secretion composition or bacterial growth inhibition were not found between conA- or PHA-treated and control udder halves during the prepartum period. Bacterial growth inhibition by mammary secretion decreased markedly during early lactation. A highly significant positive correlation was found between bacterial growth inhibition and concentrations of lactoferrin, serum albumin, and immunoglobulin G. A highly significant negative correlation was found in the citrate:lactoferrin molar ratio during early involution and the peripartum period. 相似文献
960.
Spherocytes were detected on blood smears of 2 Angus cows. The RBC from both cows had increased fragility in hypotonic saline solution, supporting the presence of spherocytes. Other laboratory tests revealed a macrocytic, regenerative anemia with anisocytosis, polychromasia, basophilic stippling, Howell-Jolly bodies, nucleated RBC, and Anaplasma marginale organisms. A complement-fixation test was positive for anaplasmosis in cow 1 and a direct Coombs' test was positive for immunoglobulin G in both cows. 相似文献