全文获取类型
收费全文 | 1735篇 |
免费 | 134篇 |
专业分类
林业 | 56篇 |
农学 | 22篇 |
基础科学 | 2篇 |
174篇 | |
综合类 | 413篇 |
农作物 | 33篇 |
水产渔业 | 82篇 |
畜牧兽医 | 991篇 |
园艺 | 39篇 |
植物保护 | 57篇 |
出版年
2023年 | 38篇 |
2022年 | 6篇 |
2021年 | 34篇 |
2020年 | 57篇 |
2019年 | 60篇 |
2018年 | 36篇 |
2017年 | 53篇 |
2016年 | 52篇 |
2015年 | 47篇 |
2014年 | 58篇 |
2013年 | 70篇 |
2012年 | 109篇 |
2011年 | 127篇 |
2010年 | 74篇 |
2009年 | 69篇 |
2008年 | 135篇 |
2007年 | 145篇 |
2006年 | 147篇 |
2005年 | 132篇 |
2004年 | 119篇 |
2003年 | 111篇 |
2002年 | 103篇 |
2001年 | 14篇 |
2000年 | 8篇 |
1999年 | 8篇 |
1998年 | 9篇 |
1997年 | 5篇 |
1996年 | 4篇 |
1995年 | 1篇 |
1994年 | 5篇 |
1993年 | 4篇 |
1992年 | 1篇 |
1991年 | 4篇 |
1990年 | 1篇 |
1989年 | 3篇 |
1987年 | 2篇 |
1985年 | 2篇 |
1983年 | 3篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1975年 | 2篇 |
1974年 | 3篇 |
1972年 | 1篇 |
1970年 | 1篇 |
1969年 | 1篇 |
1967年 | 1篇 |
排序方式: 共有1869条查询结果,搜索用时 218 毫秒
81.
Jennifer M. Reinhart Ellie K. Nuth Christopher G. Byers Mike Thoesen Laura J. Armbrust David S. Biller Kenneth R. Harkin 《The Canadian veterinary journal. La revue veterinaire canadienne》2015,56(8):867-871
A 13-year-old dog exhibited dramatic, radiographic osteopenia consistent with fibrous osteodystrophy secondary to primary hyperparathyroidism. Following parathyroidectomy, the dog developed severe, prolonged hypocalcemia, but was successfully treated and discharged 32 d after surgery. A variety of factors may have contributed to this dog’s hypocalcemia including hypoparathyroidism and hungry bone syndrome. 相似文献
82.
83.
84.
85.
86.
BACKGROUND: There is concern that pesticide residues on the external surfaces of sprayers could have an adverse impact on the environment if they are washed off, yet there is a need to remove these residues for health reasons. The aim of this study was to quantify pesticide residues contained in washings from cleaning discrete parts of a sprayer and to assess their likely environmental impact. RESULTS: The boom/rear of the sprayer and the spray tank accounted for 80% of the total pesticide load in the washings. Predicted environmental pesticide concentrations from sprayer washings were lower than predictions from the FOCUS surface water model for pesticides used under normal agricultural conditions, although for tebuconazole this difference was smaller than for the other compounds investigated. The field area over which the residues may need to be uniformly deposited to avoid overdosing during infield cleaning was typically less than 0.5 m(2), with a maximum value of 4 m(2). CONCLUSIONS: It is unlikely that infield cleaning will lead to overdosing. External residues are not insignificant, so any adverse impact on the environment must be mitigated. Appropriate measures include cleaning in the field away from surface waters and other sensitive areas, and cleaning machines over bunded areas or similar. 相似文献
87.
Jennifer Wan 《The Canadian veterinary journal. La revue veterinaire canadienne》2014,55(11):1100-1101
An 8-year-old, neutered male Labrador retriever dog with generalized pruritis had a history of recurring atopic dermatitis and superficial pyoderma. Cocci and yeast were found on cytology and methicillin-resistant Staphylococcus pseudintermedius was cultured. A regimen of marbofloxacin, dexamethasone, ketoconazole, and cyclosporine in addition to bathing with 2% chlorhexidine shampoo resulted in marked improvement. 相似文献
88.
89.
Two forms of vitellogenin were isolated by DEAE agarose ion-exchange chromatography from plasma of the tilapia, Oreochromis mossambicus. The monomers have apparent molecular masses of 200 and 130 kDa, as indicated by SDS-polyacrylamide gel electrophoresis (SDS-PAGE),
and a total amount of phosphorus of 1.7 and 0.1%, respectively. Antibodies specific to the two forms, designated tVTG-200
and tVTG-130, were generated in rabbits and used to develop enzyme-linked immunosorbent assays (ELISAs) and in Western blot
analyses of plasma and oocyte extract. SDS-PAGE of the oocyte extract showed a major protein band at 106.6, minor bands at
26.6, 24.2, and 23.7 kDa, and very faint bands at 83.4 and 17.5 kDa. Western blots of the oocyte extract revealed that the
antiserum to tVTG-200 recognized strongly the protein bands at 24.2 and 23.7 kDa, and less strongly the bands at 25.1 and
22.6 kDa, whereas the antiserum to tVTG-130 recognized mainly the protein band at 106.6 kDa. The presence of both VTGs in
untreated male tilapia was detected with the ELISAs using relatively high plasma volumes. Their presence in males was confirmed
by VTG-like immunoreactive materials eluting from the ion-exchange column at the same positions as tVTG-200 and tVTG-130.
The concentrations of the VTGs in males were several orders of magnitude lower than in vitellogenic females. Treatment of
male tilapia with estradiol-17β (E2) induced both VTGs within 24h. After 7 days, tVTG-130 reached a maximum concentration in plasma, whereas tVTG-200 continued
to increase. Our findings demonstrate that the two vitellogenins are biochemically distinct, possibly differentially regulated,
and made by both sexes. 相似文献
90.
Andrea D Stapp Craig A Gifford Dennis M Hallford Jennifer A Hernandez Gifford 《畜牧与生物技术杂志(英文版)》2014,5(1):2