全文获取类型
收费全文 | 15206篇 |
免费 | 750篇 |
国内免费 | 1872篇 |
专业分类
林业 | 1796篇 |
农学 | 2351篇 |
基础科学 | 1399篇 |
2793篇 | |
综合类 | 4240篇 |
农作物 | 838篇 |
水产渔业 | 595篇 |
畜牧兽医 | 2228篇 |
园艺 | 460篇 |
植物保护 | 1128篇 |
出版年
2024年 | 52篇 |
2023年 | 169篇 |
2022年 | 451篇 |
2021年 | 628篇 |
2020年 | 549篇 |
2019年 | 553篇 |
2018年 | 393篇 |
2017年 | 508篇 |
2016年 | 569篇 |
2015年 | 736篇 |
2014年 | 669篇 |
2013年 | 767篇 |
2012年 | 884篇 |
2011年 | 1047篇 |
2010年 | 922篇 |
2009年 | 887篇 |
2008年 | 818篇 |
2007年 | 904篇 |
2006年 | 782篇 |
2005年 | 748篇 |
2004年 | 369篇 |
2003年 | 320篇 |
2002年 | 258篇 |
2001年 | 285篇 |
2000年 | 356篇 |
1999年 | 417篇 |
1998年 | 360篇 |
1997年 | 352篇 |
1996年 | 304篇 |
1995年 | 313篇 |
1994年 | 270篇 |
1993年 | 223篇 |
1992年 | 184篇 |
1991年 | 173篇 |
1990年 | 139篇 |
1989年 | 122篇 |
1988年 | 131篇 |
1987年 | 60篇 |
1986年 | 37篇 |
1985年 | 21篇 |
1984年 | 21篇 |
1983年 | 21篇 |
1982年 | 22篇 |
1981年 | 10篇 |
1980年 | 10篇 |
1979年 | 7篇 |
1965年 | 1篇 |
1964年 | 3篇 |
1956年 | 3篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
131.
公鹅生殖器官发育形态学的研究 总被引:1,自引:0,他引:1
对在发育期间的太湖公鹅生殖器官进行了大体解割、组织学和组织化学观察,结果如下:睾丸及曲细精管的发育具有明显的阶段性;附睾区的管道系统在接近性成熟时开始区分明显;交配器官在性成熟前数周发育迅速。对生殖器官各部分进行了磷酸酶和糖类的测定。对非特异性酯酶的测定表明,在睾丸间质细胞其活性与发育相一致。鹅睾丸的血管构筑较哺乳动物简单。 相似文献
132.
The objective of this research was to survey the effects of starch quaternization and sulfosuccinylation on the adhesion of cold starch paste to raw cotton fibers for cotton warp sizing at low temperature. Acid-thinned cornstarch (ATS) was quaternized and then sulfosuccinylated to introduce 3-(trimethylammonium chloride)-2-hydroxypropyl and sulfosuccinate substituents onto its backbones. The electroneutrality of starch samples prepared was achieved by maintaining a constant mole ratio (5.3:1) of the two substituents. A series of electroneutral cornstarch (ECS) samples with different levels of the substituents were derived by altering the feed ratio of the modifying reagents to starch for determining desirable level of starch modification. Adverse influences of cotton wax and starch retrogradation on the adhesion of cold starch paste to raw cotton fibers were evaluated to illustrate the effectiveness of starch quaternization and sulfosuccinylation. It was found that the modification was able to alleviate the adverse influence of starch retrogradation and ameliorate the adhesion to the fibers at low temperature. Higher level of the modification led to less retrogradation and resulted in strong adhesion. Furthermore, the adverse influence of cotton wax on the adhesion could be eliminated after a pre-wetting treatment of raw cotton warps with hot water. The adhesion of ECS paste to raw cotton at 60 °C was statically the same as that of ATS at 95 °C when total DS of ECS was 0.0443 or higher. 相似文献
133.
Yan Lei Jiang Xuexin Ji Xiaonan Zhou Liting Li Siying Chen Chen Li Peiye Zhu Yuanchen Dong Tianhao Meng Qingfeng 《Journal of Soils and Sediments》2020,20(1):24-31
Journal of Soils and Sediments - Soil aggregates are the basic units of soil structure. Water-stable aggregates (WSAs) are greatly influenced by tillage practices. The main objective of our study... 相似文献
134.
136.
137.
The high-valued utilization of Ulva (previously known as Enteromorpha) bioresources has drawn increasing attention due to the periodic blooms of world-wide green tide. The polysaccharide is the main functional component of Ulva and exhibits various physiological activities. The Ulva oligosaccharide as the degradation product of polysaccharide not only possesses some obvious activities, but also possesses excellent solubility and bioavailability. Both Ulva polysaccharides and oligosaccharides hold promising potential in the food industry as new functional foods or food additives. Studies on Ulva polysaccharides and oligosaccharides are increasing and have been the focus of the marine bioresources field. However, the comprehensive review of this topic is still rare and do not cover the recent advances of the structure, isolation, preparation, activity and applications of Ulva polysaccharides and oligosaccharides. This review systematically summarizes and discusses the recent advances of chemical composition, extraction, purification, structure, and activity of Ulva polysaccharides as well as oligosaccharides. In addition, the potential applications as new functional food and food additives have also been considered, and these will definitely expand the applications of Ulva oligosaccharides in the food and medical fields. 相似文献
138.
139.
Ren Z Pan C Jiang L Wu C Liu Y Zhong Z Ran L Ren F Chen X Wang Y Zhu Y Huang K 《Veterinary microbiology》2011,152(3-4):368-373
In this study, lactic acid bacteria in canine feces were isolated and identified, and their oxalate-degrading capacities were evaluated. The oxalate-degrading capacities were determined for 24 of 47 (51.06%) lactic acid bacteria isolates. Of these, 8 isolates [Leuconostoc mesenteroides (RL75), Lactococcus garvieae (CD2), Lactococcus subsp. lactis (CS21), Enterococcus faecium (CL71 and CL72), and Enterococcus faecalis (CD14, CS62, and CD12)] degraded more than 5% of the oxalate present, while the others degraded less than 5% of the oxalate in vitro. Isolates that degraded more than 5% of the oxalate present were selected for further examination. The oxalate-degrading capacities of individual isolates, a mixture of Enterococcus, a mixture of Lactococcus, and a mixture of the eight isolates were evaluated in media containing different concentrations of glucose (sufficient, insufficient, or no glucose). In comparison with the control medium, all of the individual isolates and mixtures of isolates could degrade oxalate in all three groups (P<0.05). In most cases, the isolates growing in medium with 20 g/L of glucose had higher oxalate-degrading capacities than those growing in medium with 2.5 g/L of glucose or no glucose. The mixture of all isolates showed higher oxalate-degrading capacity than the individual isolates and other mixtures. The oxalate-degrading capacities of the isolates were isolate dependent. 相似文献
140.
Dosage assessment of valnemulin in pigs based on population pharmacokinetic and Monte Carlo simulation 下载免费PDF全文
Y. X. Zhang J. Sun X. Y. Luo L. X. Zhu Z. Zhang R. Wang Y. H. Liu 《Journal of veterinary pharmacology and therapeutics》2015,38(4):400-409
To estimate the valnemulin pharmacokinetic profile in a swine population and to assess a dosage regimen for increasing the likelihood of optimization. This study was, respectively, performed in 22 sows culled by p.o. administration and in 80 growing‐finishing pigs by i.v. administration at a single dose of 10 mg/kg to develop a population pharmacokinetic model and Monte Carlo simulation. The relationships among the plasma concentration, dose, and time of valnemulin in pigs were illustrated as Ci,v = X0(8.4191 × 10‐4 × e?0.2371t + 1.2788 × 10?5 × e?0.0069t) after i.v. and Cp.o = X0(?8.4964 × 10?4 × e?0.5840t + 8.4195 × e?0.2371t + 7.6869 × 10?6 × e?0.0069t) after p.o. Monte Carlo simulation showed that T>MIC was more than 24 h when a single daily dosage at 13.5 mg/kg BW in pigs was administrated by p.o., and MIC was 0.031 mg/L. It was concluded that the current dosage regimen at 10–12 mg/kg BW led to valnemulin underexposure if the MIC was more than 0.031 mg/L and could increase the risk of treatment failure and/or drug resistance. 相似文献