全文获取类型
收费全文 | 1660篇 |
免费 | 72篇 |
专业分类
林业 | 64篇 |
农学 | 33篇 |
基础科学 | 8篇 |
177篇 | |
综合类 | 270篇 |
农作物 | 75篇 |
水产渔业 | 122篇 |
畜牧兽医 | 845篇 |
园艺 | 25篇 |
植物保护 | 113篇 |
出版年
2021年 | 13篇 |
2020年 | 28篇 |
2019年 | 30篇 |
2018年 | 23篇 |
2017年 | 23篇 |
2016年 | 26篇 |
2015年 | 17篇 |
2014年 | 27篇 |
2013年 | 58篇 |
2012年 | 60篇 |
2011年 | 99篇 |
2010年 | 39篇 |
2009年 | 47篇 |
2008年 | 114篇 |
2007年 | 103篇 |
2006年 | 95篇 |
2005年 | 111篇 |
2004年 | 109篇 |
2003年 | 107篇 |
2002年 | 111篇 |
2001年 | 28篇 |
2000年 | 19篇 |
1999年 | 21篇 |
1998年 | 15篇 |
1997年 | 16篇 |
1996年 | 16篇 |
1995年 | 15篇 |
1994年 | 16篇 |
1993年 | 9篇 |
1992年 | 19篇 |
1991年 | 13篇 |
1990年 | 10篇 |
1989年 | 21篇 |
1988年 | 17篇 |
1987年 | 8篇 |
1986年 | 13篇 |
1985年 | 17篇 |
1984年 | 8篇 |
1983年 | 12篇 |
1982年 | 7篇 |
1981年 | 15篇 |
1979年 | 10篇 |
1978年 | 7篇 |
1976年 | 14篇 |
1975年 | 11篇 |
1974年 | 10篇 |
1972年 | 12篇 |
1970年 | 14篇 |
1968年 | 10篇 |
1967年 | 11篇 |
排序方式: 共有1732条查询结果,搜索用时 109 毫秒
51.
Christopher R. Lamb MA VetMB Kenneth W. Simpson BVM&S PhD 《Veterinary radiology & ultrasound》1995,36(2):139-145
Pancreatitis can be induced in dogs by intravenous infusion of supraphysiologic doses of synthetic cholecystokinin octapeptide (CCK-8). Eight anesthetized female beagles were given either CCK-8 or saline in a randomized, blinded fashion and had abdominal ultrasonography to study the development of pancreatic lesions. Pancreatic lesions were apparent 2 hours after the start of CCK-8 infusion and included swelling, interlobular and subcapsular fluid accumulation and patchy hypoechogenicity of the gland parenchyma. CCK-8 had a variable effect on gallbladder emptying. No signs of biliary obstruction or duodenal lesions were identified. Dogs given CCK-8 had severe edematous pancreatitis at necropsy six hours after the start of the infusion. Compared to the oleic acid model of pancreatitis, CCK-8 infusion induces a rapid onset of pancreatitis and an ultrasonographic appearance that reflects diffuse edema of the gland. The short time-scale of the experiment may account for the relative absence of secondary lesions affecting the biliary tract or duodenum compared to the naturally-occurring disease. 相似文献
52.
David C. Lewis Kenneth M. Meyers 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》1996,10(4):207-218
Canine idiopathic thrombocytopenic purpura (ITP) is a disease in which antibodies bound to the surface of platelets mediate premature platelet destruction by macrophages. ITP in dogs and chronic ITP in humans are analogous diseases. This article draws on information from the literature on ITP in dogs and in humans, and reviews the pathogenesis, diagnosis, and treatment of ITP in dogs. J Vet Intern Med 1996;207–218. Copyright © 1996 by the American College of Veterinary Internal Medicine . 相似文献
53.
54.
55.
Four species of adult Diptera, Rhagoletis pomonella (Walsh), Drosophila melanogaster Mg., Drosophila hydei Sturt., and Musca domestica L. showed varying degrees of reduced fecundity when sublethal doses of arsenic were included in their food. The possible influence of the frequent use of arsenicals on arthropod populations is discussed. 相似文献
56.
57.
Buchanan JW Patterson DF 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2003,17(2):167-171
Patent ductus arteriosus (PDA) is the most common congenital heart disease in dogs and usually causes heart failure and death unless corrected at a young age. Previous histologic studies in a line of dogs derived from Miniature Poodles with hereditary PDA identified varying degrees of hypoplasia and asymmetry of ductus-specific smooth muscle and the presence of aortalike elastic tissue in the ductus wall sufficient to cause patency. To determine if similar structural abnormalities cause PDA in other dogs, serial-section, 3-dimensional histology of ductal architecture was studied in 8 non-Poodle purebred dogs with PDA with no immediate family history of PDA. Morphologic abnormalities were observed in 7 of 8 dogs with PDA and essentially were the same as those in dogs known to have a hereditary form of PDA. These findings suggest that apparently sporadic PDA in these breeds is caused by a genetic defect in the structure of the ductus arteriosus that is similar or identical to that in the Poodle. The relatives of dogs with PDA, particularly parents, offspring, and siblings, should be screened for evidence of PDA. Dogs with PDA should not be used for breeding, regardless of breed. 相似文献
58.
Grubbs ST Amodie D Rulli D Wulster-Radcliffe M Reinemeyer C Yazwinski T Tucker C Hutchens D Smith L Patterson D 《Veterinary therapeutics : research in applied veterinary medicine》2003,4(3):249-256
The safety and efficacy of 2% moxidectin/12.5% praziquantel oral gel administered at a rate of 0.4 mg moxidectin and 2.5 mg praziquantel/kg was studied in client-owned horses under field use conditions. Four hundred horses (300 treated with moxidectin/praziquantel oral gel and 100 treated with vehicle) were enrolled, feces were collected, and eggs were counted. Investigators as well as horse owners were masked to treatment assignment. No adverse reactions to treatment were observed in any horses. Moxidectin/praziquantel gel reduced Anoplocephala spp by more than 99% and provided a significant (P <.05) reduction (> 98%) in the strongyle egg count of treated horses. 相似文献
59.
Cole LK Kwochka KW Kowalski JJ Hillier A Hoshaw-Woodard SL 《Veterinary therapeutics : research in applied veterinary medicine》2003,4(1):12-23
Thirty-one ears (16 dogs) with otitis externa originating from bacterial or yeast infections were enrolled in a study to evaluate the in vivo efficacy of an ear cleanser containing 2.5% lactic acid and 0.1% salicylic acid for the treatment of infectious otitis externa. The affected ears were treated with the ear cleanser twice daily for 2 weeks and evaluated after 1 and 2 weeks of treatment. The ear cleanser was effective in resolution of infection in 67.7% of the ears, and clinical signs of infectious otitis externa were significantly reduced within 2 weeks. 相似文献
60.
Bartels KE Higbee RG Bahr RJ Galloway DS Healey TS Arnold C 《Journal of the American Veterinary Medical Association》2003,222(12):1733-1739
OBJECTIVE: To determine outcome of and complications associated with prophylactic percutaneous laser disk ablation in dogs with thoracolumbar disk disease. DESIGN: Retrospective study. ANIMALS: 277 dogs. PROCEDURE: Medical records of dogs with a history of thoracolumbar disk disease in which the 7 intervertebral disks from T10-11 through L3-4 were ablated with a holmium-yttrium-aluminum-garnet laser inserted through percutaneously placed needles were reviewed. Complications and episodes of a recurrence of neurologic signs (eg, paresis or paralysis) were recorded. Owners were contacted by telephone for follow-up information. RESULTS: Nine of 262 (3.4%) dogs for which follow-up information was available had a recurrence of paresis or paralysis. Follow-up time ranged from 1 to 85 months (mean, 15 months); signs recurred between 3 and 52 months (mean, 15.1 months) after laser disk ablation. Acute complications occurred in 5 dogs and included mild pneumothorax in 1 dog, an abscess at a needle insertion site in 1 dog, and proprioceptive deficits in 3 dogs, 1 of which required hemilaminectomy within 1 week because of progression and severity of neurologic signs. One dog developed diskospondylitis. CONCLUSIONS AND CLINICAL RELEVANCE: Results suggest that prophylactic percutaneous laser disk ablation is associated with few complications and may reduce the risk of recurrence of signs of intervertebral disk disease in dogs. 相似文献