全文获取类型
收费全文 | 1096篇 |
免费 | 120篇 |
国内免费 | 1篇 |
专业分类
林业 | 21篇 |
农学 | 24篇 |
基础科学 | 14篇 |
105篇 | |
综合类 | 193篇 |
农作物 | 73篇 |
水产渔业 | 31篇 |
畜牧兽医 | 637篇 |
园艺 | 8篇 |
植物保护 | 111篇 |
出版年
2020年 | 12篇 |
2019年 | 11篇 |
2018年 | 31篇 |
2017年 | 35篇 |
2016年 | 29篇 |
2015年 | 22篇 |
2014年 | 43篇 |
2013年 | 52篇 |
2012年 | 37篇 |
2011年 | 37篇 |
2010年 | 28篇 |
2009年 | 26篇 |
2008年 | 23篇 |
2007年 | 29篇 |
2006年 | 32篇 |
2005年 | 17篇 |
2004年 | 22篇 |
2003年 | 30篇 |
2002年 | 21篇 |
2001年 | 23篇 |
2000年 | 23篇 |
1999年 | 16篇 |
1998年 | 10篇 |
1997年 | 12篇 |
1995年 | 23篇 |
1993年 | 14篇 |
1992年 | 21篇 |
1991年 | 16篇 |
1990年 | 28篇 |
1989年 | 18篇 |
1988年 | 19篇 |
1987年 | 19篇 |
1986年 | 32篇 |
1985年 | 19篇 |
1984年 | 12篇 |
1983年 | 12篇 |
1982年 | 18篇 |
1979年 | 13篇 |
1978年 | 10篇 |
1977年 | 10篇 |
1976年 | 17篇 |
1975年 | 10篇 |
1974年 | 20篇 |
1973年 | 21篇 |
1972年 | 18篇 |
1971年 | 14篇 |
1970年 | 17篇 |
1969年 | 10篇 |
1967年 | 12篇 |
1966年 | 13篇 |
排序方式: 共有1217条查询结果,搜索用时 15 毫秒
51.
52.
Kathy N. Wright DVM Dipl. ACVIM Timothy K. Knilans MD Holly M. Irvin 《Journal of Veterinary Cardiology》2006,8(2):95-107
Radiofrequency catheter ablative techniques provide a unique opportunity to cure dogs of certain supraventricular tachyarrhythmias, rather than simply controlling the rhythm with drug therapy. Accessory pathways, which can participate as one limb of a rapid, narrow complex tachyarrhythmia circuit, have a particularly high cure rate with radiofrequency catheter ablation. Focal atrial tachycardias also provide a substrate that can be amenable to ablation. Tachycardia-induced myocardial dysfunction resulting from frequent tachyarrhythmic episodes will resolve after a successful ablation. This report outlines the indications, equipment, and techniques used in dogs for performing catheter ablation with temperature-controlled radiofrequency energy delivery. 相似文献
53.
Comparative efficacy of injection routes and doses of ivermectin against Psoroptes in rabbits 总被引:1,自引:0,他引:1
Rabbits infested with Psoroptes ovis (Hering) or with P cuniculi (Delafond) were injected IM or subcutaneously with ivermectin or with vehicle. A single injection of ivermectin (200 micrograms/kg) either IM or subcutaneously was inadequate to eliminate all mites in the ears of the rabbits. However, a single injection of ivermectin at 400 micrograms/kg, regardless of the route of injection, eliminated all P cuniculi mites, but eliminated P ovis mites in only 50% of the rabbits. Ivermectin was more effective against P cuniculi than against P ovis at both doses tested, regardless of the route of injection. 相似文献
54.
Ocular changes in a cat with disseminated blastomycosis 总被引:3,自引:0,他引:3
M P Nasisse R T van Ee B Wright 《Journal of the American Veterinary Medical Association》1985,187(6):629-631
A domestic shorthair cat examined because of dyspnea was found to have ophthalmoscopic and radiographic changes suggestive of systemic mycosis. The cat died despite antifungal therapy. Histologic examination revealed Blastomyces dermatitidis in the eyes, brain, lungs, stomach, liver, kidneys, spleen, pancreas, and adrenal glands. The pathologic changes were similar, but more widespread than those typically seen with canine blastomycosis. 相似文献
55.
Membranous nephropathy was induced in four cats by repeated intravenous injections of 120 mg cationic bovine serum albumin (BSA, pI 9.5). All four cats developed diffuse granular deposits of IgG and C3 along the glomerular capillary walls as early as five weeks which persisted until the end of the experiment at 17 weeks. Ultrastructural studies revealed many subepithelial electron dense deposits. Two cats developed severe proteinuria and the nephrotic syndrome characterised by hypoalbuminaemia and oedema. An additional four cats received repeated injections of unmodified native BSA (pI 4.5) and remained basically normal. This is the first report of membranous nephropathy and the nephrotic syndrome in an experimental animal model which, unlike other animal models, is subject to the spontaneously occurring disease. 相似文献
56.
57.
The influence of variable photoperiods on the feeding activity and fecundity of Galendromus occidentalis (Nesbitt) was studied on a diet of Tetranychus urticae Koch eggs. Starved G. occidentalis females were fed T. urticae eggs under ten 24-h light:dark regimes. Half of the tests started during photophase and the other half during scotophase. T. urticae eggs that were consumed and G. occidentalis eggs that were laid were counted at the end of each photophase and scotophase in a 24 h period. In general, G. occidentalis consumed more T. urticae eggs per h in the first phase of the experiment than in the second, regardless of whether the lights were on or off. In contrast to egg consumption, there were no statistical differences in the mean daily fecundity at the end of the 24-h periods. However, when the experiment was started during photophase, higher fecundity/h was encountered during scotophase than during the photophase. As a result, egg consumption rates were affected by photoperiods in both phases of the experiments. Logistic regression analysis revealed that variable photoperiods and egg consumption did not influence the fecundity of G. occidentalis. 相似文献
58.
59.
60.