全文获取类型
收费全文 | 536篇 |
免费 | 22篇 |
专业分类
林业 | 12篇 |
农学 | 4篇 |
基础科学 | 1篇 |
76篇 | |
综合类 | 173篇 |
农作物 | 14篇 |
水产渔业 | 13篇 |
畜牧兽医 | 229篇 |
园艺 | 2篇 |
植物保护 | 34篇 |
出版年
2020年 | 8篇 |
2019年 | 7篇 |
2018年 | 7篇 |
2017年 | 6篇 |
2015年 | 7篇 |
2014年 | 6篇 |
2013年 | 12篇 |
2012年 | 8篇 |
2011年 | 17篇 |
2010年 | 8篇 |
2009年 | 8篇 |
2008年 | 16篇 |
2007年 | 18篇 |
2006年 | 21篇 |
2005年 | 15篇 |
2004年 | 17篇 |
2003年 | 15篇 |
2002年 | 15篇 |
2001年 | 6篇 |
2000年 | 12篇 |
1999年 | 9篇 |
1998年 | 6篇 |
1997年 | 5篇 |
1996年 | 5篇 |
1993年 | 7篇 |
1992年 | 8篇 |
1991年 | 8篇 |
1990年 | 12篇 |
1988年 | 11篇 |
1987年 | 11篇 |
1986年 | 9篇 |
1985年 | 10篇 |
1984年 | 7篇 |
1983年 | 7篇 |
1982年 | 8篇 |
1981年 | 7篇 |
1978年 | 8篇 |
1976年 | 5篇 |
1973年 | 6篇 |
1972年 | 9篇 |
1970年 | 6篇 |
1969年 | 7篇 |
1968年 | 6篇 |
1966年 | 4篇 |
1920年 | 5篇 |
1918年 | 5篇 |
1915年 | 8篇 |
1911年 | 4篇 |
1909年 | 5篇 |
1908年 | 5篇 |
排序方式: 共有558条查询结果,搜索用时 15 毫秒
461.
Mayha Mohammed Ali Nor Elmadiena Adil Ali El Hussein Catherine Anne Muckle Linda Cole Elizabeth Wilkie Ketna Mistry Ann Perets 《Tropical animal health and production》2013,45(5):1113-1118
This study was undertaken to determine the antimicrobial resistance patterns of Salmonella enterica subspecies enterica recovered from human, food, water, and animal samples collected in Khartoum State, Sudan. A total of 64 Salmonella isolates belonging to 28 different serovars were tested for their susceptibility to 13 antimicrobial agents. The majority of isolates (98.4 %) were resistant to at least one antimicrobial agent. Isolates were frequently resistant to ampicillin (90.6 %), cephalexin (50.0 %), nalidixic acid (25.0 %), streptomycin (21.9 %), kanamycin (18.8 %), gentamicin (17.2 %), and co-trimoxazole and trimethoprim (12.5 %). The most common pattern of multiple drug resistance included resistance to ampicillin and cephalexin. Most isolates were sensitive to chloramphenicol (98.4 %), ciprofloxacin (93.8 %), and norfloxacin (90.6 %). Two chicken- and the two human-origin S. Kentucky isolates were resistant to both ciprofloxacin and norfloxacin. All S. Kentucky isolates and the one S. Rissen isolate demonstrated multi-drug resistance. The results indicate the significance of multi-drug-resistant Salmonella serovars isolated from chickens and other animals and foods as sources for multi-drug-resistant Salmonella in humans in Sudan. 相似文献
462.
Laura L. Gray Andrew Hillier Lynette K. Cole Päivi J. Rajala‐Schultz 《Veterinary dermatology》2013,24(1):118-e28
Background – Ciclosporin (CSA) is approved for the treatment of canine atopic dermatitis. Ciclosporin is metabolized by liver cytochrome P450 enzymes, a process inhibited by ketoconazole (KTZ). Hypothesis/Objectives – The aims of this study were to determine skin and blood CSA concentrations when CSA was administered alone at 5.0 (Treatment 1) or 2.5 mg/kg (Treatment 2) and when CSA was administered at 2.5 mg/kg concurrently with KTZ at 5 (Treatment 3) or 2.5 mg/kg (Treatment 4). We hypothesized that skin and blood CSA concentrations in Treatment 1 would not differ from those obtained with T3 or T4. Animals – In a randomized cross‐over study, six healthy research dogs received each of the treatments (Treatment 1, 2, 3 and 4) once daily for 7 days. Methods – After the first, fourth and seventh dose for each treatment, a peak and trough skin punch biopsy sample and whole blood sample were collected and analysed with high‐performance liquid chromatography–tandem mass spectrometry. Data were analysed using a repeated measures approach with PROC MIXED in SAS. Pairwise comparisons were performed with least squares means and Tukey–Kramer adjustment for multiple comparisons. Results – Mean blood CSA concentrations in Treatment 1 were not different from those in Treatment 2 or 4, but were less than in Treatment 3. Mean skin CSA concentrations in Treatment 1 were greater than in Treatment 2, not different from those in Treatment 4, and less than those in Treatment 3. Conclusions and clinical importance – Administration of CSA and KTZ concurrently at 2.5 mg/kg each may be as effective as CSA alone at 5.0 mg/kg for treatment of canine atopic dermatitis. 相似文献
463.
464.
465.
466.
467.
468.
469.
470.