全文获取类型
收费全文 | 1611篇 |
免费 | 138篇 |
国内免费 | 17篇 |
专业分类
林业 | 302篇 |
农学 | 87篇 |
基础科学 | 43篇 |
51篇 | |
综合类 | 995篇 |
农作物 | 24篇 |
水产渔业 | 38篇 |
畜牧兽医 | 189篇 |
园艺 | 12篇 |
植物保护 | 25篇 |
出版年
2024年 | 6篇 |
2023年 | 37篇 |
2022年 | 36篇 |
2021年 | 60篇 |
2020年 | 69篇 |
2019年 | 63篇 |
2018年 | 50篇 |
2017年 | 53篇 |
2016年 | 71篇 |
2015年 | 73篇 |
2014年 | 120篇 |
2013年 | 74篇 |
2012年 | 181篇 |
2011年 | 136篇 |
2010年 | 104篇 |
2009年 | 96篇 |
2008年 | 110篇 |
2007年 | 111篇 |
2006年 | 86篇 |
2005年 | 72篇 |
2004年 | 45篇 |
2003年 | 25篇 |
2002年 | 31篇 |
2001年 | 18篇 |
2000年 | 8篇 |
1999年 | 10篇 |
1998年 | 8篇 |
1997年 | 2篇 |
1995年 | 3篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1985年 | 1篇 |
1984年 | 1篇 |
排序方式: 共有1766条查询结果,搜索用时 500 毫秒
101.
102.
政府购买服务是我国公共服务供给的一种模式创新,对经济社会高质量发展具有重要意义。党的十八大以来,部属公益二类事业单位作为政府购买服务新的重要的承接主体,在实践中服务能力与服务质量不断得到提升,但由于历经时间不长,部属公益二类事业单位的承接能力与政府购买服务的要求还不完全相适应,还存在着一些需要研究解决的矛盾。文章对承接能力的概念、内涵和基本特征进行了创新性分析界定,在此基础上,结合当前部属公益二类事业单位政府购买服务承接能力的现状与问题,提出了加强承接主体能力建设的思路与对策。 相似文献
103.
Emily F. Pomeranz Daniel J. Decker William F. Siemer Arthur Kirsch Jeremy Hurst James Farquhar 《Human Dimensions of Wildlife》2014,19(5):448-457
The trend in wildlife management over the last two decades has been to develop locally based approaches for responsiveness to local conditions, but some state wildlife agencies are finding the amount of staff time required to service this approach prohibitive. Although local engagement strategies have been lauded as assuring that public trust obligations of state government to citizens are met, we can expect that states with a local focus as their operational level of stakeholder engagement may opt to change their approach to reflect their resource limitations. We argue for comprehensive regional level effort to understand stakeholders augmented with local engagement processes where needed to deal with special circumstances in smaller areas within a region. Such an approach can be anticipated to have implications for stakeholder engagement and human dimensions research needs, which we discuss in the context of public trust resource administration and good governance of wildlife resources. 相似文献
104.
The Public Trust Doctrine (PTD) vests states with a fiduciary responsibility to manage wildlife for the benefit of current and future generations. States have varied approaches to applying the PTD for wildlife management ranging from a traditional focus on hunters, anglers, and trappers to a progressive approach of broad inclusion of all potential stakeholders in their decision-making processes. We argue that states need to gather and incorporate more and better human dimensions (HD) information to fulfill their PTD responsibilities. We describe some of the barriers to increased use of HD and the changes in agency culture, staffing, data gathering, and decision-making processes necessary to integrate HD effectively and comport with the PTD. We conclude that in addition to increasing fulfillment of PTD responsibilities, increased use of HD information will help maintain agency relevance, increase political support, and secure broader agency funding. 相似文献
105.
106.
E. R. Campagnolo L. R. Lind J. M. Long M. E. Moll J. T. Rankin K. F. Martin M. P. Deasy V. M. Dato S. M. Ostroff 《Zoonoses and public health》2014,61(5):346-355
Rabid free‐ranging cats have been a public health concern in Pennsylvania since raccoon variant rabies first was recognized in the state in the early 1980s. Over the last decade, between 1.5 and 2.5% of cats submitted to Pennsylvania's state laboratories for rabies testing have been positive. In this report, we describe the extent of rabies in free‐ranging cats in Pennsylvania. We also present two examples of human exposure to rabid free‐ranging cats that occurred in Pennsylvania during 2010–2011 and the public health actions taken to address rabies exposure in the humans and animals. We then describe the concerns surrounding the unvaccinated and free‐ranging cat population in Pennsylvania and possible options in managing this public and animal health problem. 相似文献
107.
M. Velhner G. Kozoderović E. Grego N. Galić I. Stojanov Z. Jelesić C. Kehrenberg 《Zoonoses and public health》2014,61(5):364-370
Quinolone‐resistant Salmonella Infantis (n = 64) isolated from human stool samples, food and poultry during the years 2006–2011 were analysed for their resistance phenotypes, macrorestriction patterns and molecular mechanisms of decreased susceptibility to fluoroquinolones. Minimum inhibitory concentrations (MICs) of nalidixic acid (NAL) and ciprofloxacin (CIP) were determined by the agar dilution procedure, and the susceptibility to additional antimicrobial agents was determined by the disc diffusion method. To assess the influence of enhanced efflux activity, MICs were determined in the presence and absence of the inhibitor PAβN. The results of pulsed‐field gel electrophoresis (PFGE) typing revealed that quinolone‐resistant S. Infantis in Serbia had similar or indistinguishable PFGE profiles, suggesting a clonal spread. All S. Infantis showed combined resistance to NAL and tetracycline, whereas multiple drug resistance to three or more antibiotic classes was rare (2 isolates of human origin). The MICs ranged between 512 and 1024 μg/mL for NAL and 0.125–2 μg/mL for CIP. A single‐point mutation in the gene gyrA leading to a Ser83→Tyr exchange was detected in all isolates, and a second exchange (Ser80→Arg) in the gene parC was only present in eight S. Infantis isolates exhibiting slightly higher MICs of CIP (2 μg/mL). The inhibitor PAβN decreased the MIC values of CIP by two dilution steps and of NAL by at minimum 3–6 dilution steps, indicating that enhanced efflux plays an important role in quinolone resistance in these isolates. The plasmid‐mediated genes qnr, aac(6′)‐lb‐cr and qepA were not detected by PCR assays. 相似文献
108.
Leptospirosis is the most widespread zoonosis in the world. In northern Botswana, humans live in close proximity to a diversity of wildlife and peridomestic rodents and may be exposed to a variety of zoonotic pathogens. Little is known regarding the occurrence and epidemiology of L. interrogans in Africa despite the recognized global importance of this zoonotic disease and the threat it poses to public health. In Botswana, banded mongooses (Mungos mungo) live in close proximity to humans across protected and unprotected landscapes and may be a useful sentinel species for assessing the occurrence of zoonotic organisms, such as L. interrogans. We utilized PCR to screen banded mongoose kidneys for leptospiral DNA and identified 41.5% prevalence of renal carriage of L. interrogans (exact binomial 95% CI 27.7–56.7%, n = 41). Renal carriage was also detected in one Selous' mongoose (Paracynictis selousi). This is the first published confirmation of carriage of L. interrogans in either species. This is also the first report of L. interrogans occurrence in northern Botswana and the only report of this organism in a wildlife host in the country. Pathogenic Leptospira are usually transmitted indirectly to humans through soil or water contaminated with infected urine. Other avenues, such as direct contact between humans and wildlife, as well as consumption of mongooses and other wildlife as bushmeat, may pose additional exposure risk and must be considered in public health management of this newly identified zoonotic disease threat. There is a critical need to characterize host species involvement and pathogen transmission dynamics, including human–wildlife interactions that may increase human exposure potential and infection risk. We recommend that public health strategy be modified to include sensitization of medical practitioners to the presence of L. interrogans in the region, the potential for human infection, and implementation of clinical screening. This study illustrates the need for increased focus on neglected zoonotic diseases as they present an important threat to public health. 相似文献
109.
徐立波 《信阳农业高等专科学校学报》2014,(2):9-10
以邓小平为核心的第二代领导集体对巴黎公社社会公仆思想进行了发展。应做好思想政治工作;健全法制,完善监督机制;加强党风廉政建设;弘扬榜样巨大力量;保障人民权利,防止公仆变主人。 相似文献
110.
徐洪双 《农业机械化与电气化》2014,(11):89-90
根据沈阳市县级农业机械化培训学校的基本情况,从培训主体、内容以发展方向3个方面,探讨县级农业机械化学校向公益性发展过程中应采取的主要措施,为促进县级农业机械化学校健康发展提供参考。 相似文献