全文获取类型
收费全文 | 1779篇 |
免费 | 134篇 |
国内免费 | 1篇 |
专业分类
林业 | 59篇 |
农学 | 24篇 |
基础科学 | 2篇 |
181篇 | |
综合类 | 420篇 |
农作物 | 38篇 |
水产渔业 | 84篇 |
畜牧兽医 | 1010篇 |
园艺 | 39篇 |
植物保护 | 57篇 |
出版年
2024年 | 2篇 |
2023年 | 39篇 |
2022年 | 16篇 |
2021年 | 37篇 |
2020年 | 57篇 |
2019年 | 63篇 |
2018年 | 37篇 |
2017年 | 53篇 |
2016年 | 55篇 |
2015年 | 47篇 |
2014年 | 58篇 |
2013年 | 74篇 |
2012年 | 110篇 |
2011年 | 132篇 |
2010年 | 74篇 |
2009年 | 69篇 |
2008年 | 138篇 |
2007年 | 146篇 |
2006年 | 148篇 |
2005年 | 133篇 |
2004年 | 119篇 |
2003年 | 113篇 |
2002年 | 104篇 |
2001年 | 15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 | 4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 |
1968年 | 1篇 |
1967年 | 1篇 |
排序方式: 共有1914条查询结果,搜索用时 15 毫秒
81.
82.
David L. Dycus Jennifer L. Wardlaw Dennis Rowe Steve Elder 《The Canadian veterinary journal. La revue veterinaire canadienne》2013,54(4):353-358
This study evaluated the biomechanical characteristics of a single self-locking knot (sSLK) and a double self-locking knot (dSLK) compared with the square knot (SQ) for stabilization of cranial cruciate ligament rupture. Each knot underwent monotonic tensile and cyclical loading. Starting tension, elongation, stiffness, and load to failure were all evaluated. A value of P < 0.05 was considered significant. Starting tension, overall stiffness, and load to failure were all significantly greater in both the sSLK and dSLK compared with the SQ. There was no difference in elongation among the knots. There were no significant differences in starting tension, elongation, stiffness, and load to failure between the sSLK and the dSLK. The self-locking knots were stronger and stiffer than the SQ; there is no biomechanical advantage in using the dSLK compared with the sSLK. 相似文献
83.
84.
85.
Whistler JL Enquist J Marley A Fong J Gladher F Tsuruda P Murray SR Von Zastrow M 《Science (New York, N.Y.)》2002,297(5581):615-620
Recycling of the mu opioid receptor to the plasma membrane after endocytosis promotes rapid resensitization of signal transduction, whereas targeting of the delta opioid receptor (DOR) to lysosomes causes proteolytic down-regulation. We identified a protein that binds preferentially to the cytoplasmic tail of the DOR as a candidate heterotrimeric GTP-binding protein (G protein)-coupled receptor-associated sorting protein (GASP). Disruption of the DOR-GASP interaction through receptor mutation or overexpression of a dominant negative fragment of GASP inhibited receptor trafficking to lysosomes and promoted recycling. The GASP family of proteins may modulate lysosomal sorting and functional down-regulation of a variety of G protein-coupled receptors. 相似文献
86.
LeVine DN Papich MG Gookin JL Davidson GS Davis JL Hayes RB 《Journal of Feline Medicine and Surgery》2011,13(4):244-250
Ronidazole (RDZ) is an effective treatment for feline Tritrichomonas foetus infection, but has produced neurotoxicity in some cats. An understanding of the disposition of RDZ in cats is needed in order to make precise dosing recommendations. Single-dose pharmacokinetics of intravenous (IV) RDZ and immediate-release RDZ capsules were evaluated. A single dose of IV RDZ (mean 9.2mg/kg) and a 95mg immediate-release RDZ capsule (mean 28.2mg/kg) were administered to six healthy cats in a randomized crossover design. Plasma samples were collected for 48 h and assayed for RDZ using high pressure liquid chromatography (HPLC). Systemic absorption of oral RDZ was rapid and complete, with detection in the plasma of all cats by 10 min after dosing and a bioavailability of 99.64 (±16.54)%. The clearance of RDZ following IV administration was 0.82 (±0.07) ml/kg/min. The terminal half-life was 9.80 (±0.35) and 10.50 (±0.82) h after IV and oral administration, respectively, with drug detectable in all cats 48h after both administrations. The high oral bioavailability of RDZ and slow elimination may predispose cats to neurotoxicity with twice-daily administration. Less frequent administration should be considered for further study of effective treatment of T foetus-infected cats. 相似文献
87.
88.
89.
Adams Alison B. Pontius Jennifer Galford Gillian Gudex-Cross David 《Landscape Ecology》2019,34(10):2401-2419
Landscape Ecology - Understanding how the Northern Forest landscape has changed and is likely to change, both in terms of forest extent and forest configuration, has important implications for... 相似文献
90.
Tamara L. Grubb Danielle Kurkowski Deborah C. Sellon Kathy K. Seino Todd Coffey Jennifer L. Davis 《Journal of veterinary pharmacology and therapeutics》2019,42(1):26-36
Buprenorphine is absorbed following sublingual administration, which would be a low‐stress delivery route in foals. However, the pharmacokinetics/pharmacodynamics are not described in foals. Six healthy foals <21 days of age participated in a blinded, randomized, 3‐period, 5‐sequence, 3‐treatment crossover prospective study. Foals received 0.01–0.02 mg/kg buprenorphine administered SL or IV with an equivalent volume of saline administered by the opposite route. Blood was collected from the cephalic vein for pharmacokinetic analysis. Physiologic parameters (HR, RR, body temperature, GI sounds), locomotion (pedometer), and behavioral data (activity level, nursing time, response to humans) were recorded. Plasma concentration of buprenorphine exceeded a presumed analgesic level (0.6 ng/ml) in five foals in the IV group and one in the SL group but only for a very brief time. Pharmacokinetic analysis following IV administration demonstrated a short elimination half‐life (t1/2β 1.95 ± 0.7 hr), large volume of distribution (6.46 ± 1.54 L/kg), and a high total clearance (55.83 ± 23.75 ml/kg/min), which differs from adult horses. Following SL administration, maximum concentrations reached were 0.61 ± 0.11 ng/ml and bioavailability was 25.1% ± 10.9%. In both groups, there were minor statistical differences in HR, RR, body temperature, locomotion, and time spent nursing. However, these differences were clinically insignificant in this single dose study, and excitement, sedation, or colic did not occur. 相似文献