全文获取类型
收费全文 | 871篇 |
免费 | 69篇 |
国内免费 | 2篇 |
专业分类
林业 | 16篇 |
农学 | 23篇 |
基础科学 | 3篇 |
53篇 | |
综合类 | 151篇 |
农作物 | 24篇 |
水产渔业 | 35篇 |
畜牧兽医 | 601篇 |
园艺 | 6篇 |
植物保护 | 30篇 |
出版年
2023年 | 8篇 |
2021年 | 8篇 |
2020年 | 14篇 |
2019年 | 15篇 |
2018年 | 21篇 |
2017年 | 12篇 |
2016年 | 17篇 |
2015年 | 8篇 |
2014年 | 22篇 |
2013年 | 48篇 |
2012年 | 17篇 |
2011年 | 27篇 |
2010年 | 31篇 |
2009年 | 31篇 |
2008年 | 19篇 |
2007年 | 38篇 |
2006年 | 41篇 |
2005年 | 37篇 |
2004年 | 27篇 |
2003年 | 25篇 |
2002年 | 28篇 |
2001年 | 25篇 |
2000年 | 22篇 |
1999年 | 22篇 |
1998年 | 30篇 |
1997年 | 19篇 |
1996年 | 18篇 |
1995年 | 19篇 |
1994年 | 6篇 |
1993年 | 9篇 |
1992年 | 26篇 |
1991年 | 16篇 |
1990年 | 14篇 |
1989年 | 18篇 |
1988年 | 15篇 |
1987年 | 14篇 |
1986年 | 7篇 |
1985年 | 14篇 |
1984年 | 5篇 |
1983年 | 5篇 |
1980年 | 5篇 |
1979年 | 9篇 |
1977年 | 9篇 |
1976年 | 6篇 |
1973年 | 6篇 |
1971年 | 10篇 |
1970年 | 4篇 |
1969年 | 5篇 |
1914年 | 4篇 |
1902年 | 4篇 |
排序方式: 共有942条查询结果,搜索用时 15 毫秒
941.
Single layer centrifugation of fresh dromedary camel semen improves sperm quality and in vitro fertilization capacity compared with simple sperm washing 下载免费PDF全文
C Malo EG Crichton JM Morrell BS Pukazhenthi JA Skidmore 《Reproduction in domestic animals》2017,52(6):1097-1103
Single layer centrifugation (SLC) through a colloid is a tool for selecting viable mammalian spermatozoa but has not been used previously for fresh dromedary camel sperm. Semen from six camels (2 ejaculates/male) was diluted 1:5 (v:v) or 1:10 (v:v) in a Tris–citrate–fructose buffer for mechanical liquefaction by gentle pipetting. Following liquefaction, semen was processed either by SLC or by centrifugation without a colloid (control). Total and progressive motilities, CASA kinematics, vitality and acrosome integrity (eosin–nigrosin) and plasma membrane integrity (Hypo‐osmotic swelling test; HOST), and fertilizing ability in a heterologous assay (zona‐free goat oocytes) were evaluated. Both total (p = .003) and progressive motilities (p = .003) were higher in SLC‐processed than in control semen samples, irrespective of dilution. Positive HOST values increased when using colloid in 1:5 (p = .001) and 1:10 dilution (p = .010). Colloid‐selected sperm had higher penetration rates than controls (p < .001 and p = .02 for 1:5 and 1:10 dilutions, respectively). However, only the SLC sperm at 1:5 dilution showed higher percentages of pronuclear formation (p = .02) than controls. Dilution effect was only significant for total motility before in vitro fertilization, with higher values for the 1:5 dilution (p = .033). The recovery rates of motile sperm between dilutions were similar (26.1% vs 35.4%; p = .226). In conclusion, SLC is a promising tool for selecting functional dromedary camel sperm and warrants more research. 相似文献
942.
Wet glutens of 27 European spelt (Triticum aestivum ssp. spelta (L.) Thell.) cultivars were examined using fundamental rheological methods (oscillatory and creep tests) in conjunction with the determination of moisture contents of these glutens and the wet gluten contents of the flours. Furthermore, SDS sedimentation volumes were determined. A special baking test for spelt was developed that encompassed the characteristic elements used in the production of traditional German spelt speciality breads. Various significant correlations between gluten properties and baking results were found for three sets of spelt cultivars obtained from different demographic locations and years of harvest. Furthermore, the relationship between baking results (response) and gluten properties (predictors) could be modeled quite well with the help of multiple linear regression analysis. Radar charts used to profile the gluten properties of a particular cultivar showed a great amount of diversity within the spelt material, but there were also similarities between several cultivars. The differences between spelt cultivars should be taken into account when characterizing spelt in general terms or when comparing spelt and modern wheat. 相似文献