全文获取类型
收费全文 | 25342篇 |
免费 | 1505篇 |
国内免费 | 2635篇 |
专业分类
林业 | 1869篇 |
农学 | 2615篇 |
基础科学 | 1491篇 |
3564篇 | |
综合类 | 10670篇 |
农作物 | 1556篇 |
水产渔业 | 852篇 |
畜牧兽医 | 3914篇 |
园艺 | 1572篇 |
植物保护 | 1379篇 |
出版年
2024年 | 117篇 |
2023年 | 427篇 |
2022年 | 1140篇 |
2021年 | 1263篇 |
2020年 | 1165篇 |
2019年 | 1164篇 |
2018年 | 809篇 |
2017年 | 1269篇 |
2016年 | 1042篇 |
2015年 | 1323篇 |
2014年 | 1400篇 |
2013年 | 1659篇 |
2012年 | 2139篇 |
2011年 | 2103篇 |
2010年 | 2012篇 |
2009年 | 1753篇 |
2008年 | 1578篇 |
2007年 | 1429篇 |
2006年 | 1198篇 |
2005年 | 952篇 |
2004年 | 465篇 |
2003年 | 396篇 |
2002年 | 466篇 |
2001年 | 376篇 |
2000年 | 374篇 |
1999年 | 273篇 |
1998年 | 184篇 |
1997年 | 144篇 |
1996年 | 146篇 |
1995年 | 134篇 |
1994年 | 112篇 |
1993年 | 114篇 |
1992年 | 72篇 |
1991年 | 62篇 |
1990年 | 54篇 |
1989年 | 42篇 |
1988年 | 44篇 |
1987年 | 20篇 |
1986年 | 14篇 |
1985年 | 10篇 |
1984年 | 5篇 |
1983年 | 3篇 |
1982年 | 4篇 |
1981年 | 4篇 |
1980年 | 2篇 |
1979年 | 3篇 |
1963年 | 1篇 |
1962年 | 2篇 |
1956年 | 8篇 |
1955年 | 2篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
102.
豫南地区野生地被植物资源现状调查与研究 总被引:1,自引:0,他引:1
豫南地区野生地被植物资源丰富,为了在城市绿化中引入新的具有利用价值的种类,对以信阳为中心的河南省南部具有典型立地条件的区域的野生地被植物资源进行了调查。结果表明:筛选统计出野生地被植物56科,359属,822种,其中具有较大开发利用价值的50种。通过对50种野生地被植物中的15种进行利用价值研究得出,随着植物的生态适应性的增强,该种植物同时观赏价值、经济价值也相对增高,在园林应用中可利用价值也越大。 相似文献
103.
104.
Meat quality means the characteristics such as appearance is related to palatability in fresh meat or manufactured meat, it includes meat color, meat structure, hardness, marbling, water holding capacity and so on.The physical characteristics of mutton quality determines the consumer acceptability of meat and there is a close relationship between chemical composition of mutton quality and nutrient substance.With the improvement of living standards, consumers are increasingly high demand for mutton.From quantitative to qualitative change, we need to continuously improve mutton quality.At present, the production of high quality animal products has become a hot topic.This paper is a summary of the effects of breed, gender, age, environment and feed nutrition on mutton quality, and aims to provide a scientific basis for improving of mutton quality with nutritional regulation measures. 相似文献
105.
针对目前在大坝碾压施工过程中,传统施工质量控制方式难以满足日益提高的对高坝施工技术的需要,基于北斗卫星导航系统(BDS)和地理信息系统(GIS),对大坝碾压施工质量实时监控技术进行研究。通过安装在碾压机械上的加载设备及振动传感器采集数据,在集成软件处理并记录该碾压机械碾压施工过程,实现对碾压过程全程、全自动的实时监控。将研究结果应用于平桥水库面板堆石坝碾压施工过程中,结果表明,系统实现了对大坝碾压施工过程压实质量参数的有效监控,为大坝高质量、高强度施工提供保障,为工程管理提供便利和依据。 相似文献
106.
Yuru Luo Ruiqi Zhang Jing Gao Yali Wang Weimin Zhang Suzhu Qing 《Reproduction in domestic animals》2020,55(7):822-832
Epidermal growth factor (EGF) is one of the important regulatory factors of EGF family. EGF has been indicated to effectively inhibit the apoptosis of follicular cells, to promote the proliferation of granulosa cells and the maturation of oocytes, and to induce ovulation process via binding to epidermal growth factor receptor (EGFR). However, little is known about the distribution and expression of EGF and EGFR in cattle ovary especially during oestrous cycle. In this study, the localization and expression rule of EGF and EGFR in cattle ovaries of follicular phase and luteal phase at different time points in oestrous cycle were investigated by using IHC and real-time qPCR. The results showed that EGF and EGFR in cattle ovary were mainly expressed in granulosa cells, cumulus cells, oocytes, zona pellucida, follicular fluid and theca folliculi externa of follicles. The protein and mRNA expression of EGF/EGFR in follicles changed regularly with the follicular growth wave both in follicular and in luteal phase ovaries. In follicular phase ovaries, the protein expression of EGF and EGFR was higher in antral follicles than that of those in other follicles during follicular growth stage, and the mRNA expression of EGFR was also increased in stage of dominant follicle selection. However, in luteal phase ovaries, the growth of follicles was impeded during corpus luteum development under the action of progesterone secreted by granular lutein cell. The mRNA and protein expressions of EGF and EGFR in ovarian follicles during oestrous cycle indicate that they play a role in promoting follicular development in follicular growth waves and mediating the selection process of dominant follicles. 相似文献
107.
108.
109.
LI Ming JIA Hong XIN Ting GUO Xiao-yu YUAN Wei-feng HOU Shao-hua HOU Qiang GAO Xin-tao WU Jing DONG Rui-kai YANG Hong-jun LIU Lai-xing ZHU Hong-fei 《中国畜牧兽医》2015,42(10):2544-2550
To explore the value of Mb1230 protein of Mycobacterium bovis in the diagnosis of bovine tuberculosis,we obtained the Mb1230 gene by PCR and constructed recombinant plasmid pET-22b-Mb1230.Recombinant Mb1230 protein was obtained by IPTG induction and purified by affinity chromatography.The activity of the recombinant protein was evaluated by TST test,IGRA test and indirect ELISA.The size of the recombinant protein matched with the theoretical value proved by SDS-PAGE;Western blotting result showed that the recombinant protein could react with mouse anti-His antibody,and had specific band;The results of TST test,IGRA test and indirect ELISA test also showed the recombinant protein had antigenic activity.The results indicated the recombinant protein Mb1230 had good B cell and T cell activity,so,it had the potential application in the diagnosis of bovine tuberculosis. 相似文献
110.