全文获取类型
收费全文 | 17978篇 |
免费 | 983篇 |
国内免费 | 1748篇 |
专业分类
林业 | 1476篇 |
农学 | 1662篇 |
基础科学 | 1098篇 |
2235篇 | |
综合类 | 7612篇 |
农作物 | 1118篇 |
水产渔业 | 809篇 |
畜牧兽医 | 2656篇 |
园艺 | 1112篇 |
植物保护 | 931篇 |
出版年
2024年 | 124篇 |
2023年 | 365篇 |
2022年 | 800篇 |
2021年 | 826篇 |
2020年 | 798篇 |
2019年 | 764篇 |
2018年 | 542篇 |
2017年 | 830篇 |
2016年 | 596篇 |
2015年 | 963篇 |
2014年 | 942篇 |
2013年 | 1071篇 |
2012年 | 1363篇 |
2011年 | 1445篇 |
2010年 | 1276篇 |
2009年 | 1114篇 |
2008年 | 1096篇 |
2007年 | 997篇 |
2006年 | 923篇 |
2005年 | 774篇 |
2004年 | 470篇 |
2003年 | 384篇 |
2002年 | 479篇 |
2001年 | 389篇 |
2000年 | 327篇 |
1999年 | 195篇 |
1998年 | 112篇 |
1997年 | 98篇 |
1996年 | 90篇 |
1995年 | 89篇 |
1994年 | 80篇 |
1993年 | 56篇 |
1992年 | 69篇 |
1991年 | 72篇 |
1990年 | 35篇 |
1989年 | 44篇 |
1988年 | 33篇 |
1987年 | 26篇 |
1986年 | 9篇 |
1985年 | 11篇 |
1984年 | 2篇 |
1983年 | 4篇 |
1982年 | 6篇 |
1981年 | 4篇 |
1979年 | 2篇 |
1965年 | 1篇 |
1964年 | 3篇 |
1962年 | 1篇 |
1956年 | 6篇 |
1955年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 9 毫秒
21.
22.
23.
试样中残留的氯霉素与氯霉素酶标记物共同竞争氯霉素抗体,形成有酶标记或无酶标记的抗原抗体复合物而被吸附于微孔底板。用酶标仪在波长450 nm处测定吸光度,根据吸光度得出样品中氯霉素的残留量。对禽蛋中氯霉素残留量进行测定,并对其加标回收率、再现性、重复性进行了分析研究,均能够达到国际氯霉素残留量的检测要求。 相似文献
24.
有机肥替代化肥是加快推进农业绿色发展、资源循环利用、发展现代农业的重要技术之一。本文系统总结了蒙阴县有机肥替代化肥项目实施的主要经验做法和取得的成效,对项目实施过程中出现的问题进行了分析,并提出了意见和建议。通过项目实施,果园土壤理化性状和生态环境得到有效改善,果品品质显著提高,市场竞争力不断增强,促进了农民增收和农业的转型升级。 相似文献
25.
随着农业新业态迅猛发展,我国农业新业态新领域的知识产权保护显著滞后,尤其在休闲农业领域较为突出。加强相关领域知识产权保护,对于促进我国农业高质量发展和乡村振兴具有重要作用。但是由于休闲农业相关知识产权保护制度体系缺乏可借鉴的国际经验、制度执行缺少针对性的保护手段、新型经营主体知识产权保护意识差等问题,对休闲农业长期健康发展造成较大影响。因此,应基于对不同主体知识产权应用与保护诉求的充分了解,精准创设新型知识产权制度、加快管理方式创新、搭建多元参与平台,系统解决创意设计边界不清、农业资源权利主体模糊、技术更迭快过制度供给等问题。 相似文献
26.
27.
28.
29.
木材碳学是近年来兴起的一门科学, 其主要研究内容包括木材碳素的储存量、木材储能、人工林木材固碳增汇与优质木材培育技术及木质产品固碳延伸等方面。文中简述了木材碳学研究中木材固碳量与含碳率、木材固碳量的影响因素、木材固碳量与木材热值的关系以及木质材料固碳量和固碳延伸等方面的研究现状, 并对今后的研究方向进行了展望。 相似文献
30.
Objective To determine ocular distribution and toxicity of a single injection of intravitreal triamcinolone acetonide (TA) in normal horses.
Animals studied Six adult horses, donated to North Carolina State University.
Procedures Six horses were injected intravitreally with either 10, 20, or 40 mg ( n = 2 each) of TA. The opposite eye of each horse was injected with balanced salt solution (BSS). Ocular toxicity was assessed by biomicroscopy, tonometry, indirect ophthalmoscopy, and electroretinogram. Aqueous humor (AH), vitreous humor (VH), and plasma samples were collected. Horses were euthanized 7 or 21 days after injection and eyes enucleated for histopathology. TA concentrations in AH, VH, and plasma were measured by HPLC.
Results Three control eyes and one TA eye developed inflammation after injection or collection of AH. Positive bacterial cultures ( Corynebacterium spp., Staphylococcus spp., and Streptococcus spp.) were obtained from three of these eyes. Other than transient corneal edema in TA injected eyes, which resolved by 7 days after injection, no other changes were observed. TA crystals were visible within the vitreous body. No evidence of TA toxic effect was noted on histopathology. TA was detected in all AH and VH samples from treated eyes following injection. Drug was not detected in the plasma.
Conclusions There was no evidence of overt toxicity from intravitreal TA in normal horses and a single intravitreal injection resulted in TA ocular levels for 21 days. However, the risk for bacterial infections with intravitreal injection or anterior chamber aspirations in horses is high. Use of topical and systemic antibiotics after injection is recommended. 相似文献
Animals studied Six adult horses, donated to North Carolina State University.
Procedures Six horses were injected intravitreally with either 10, 20, or 40 mg ( n = 2 each) of TA. The opposite eye of each horse was injected with balanced salt solution (BSS). Ocular toxicity was assessed by biomicroscopy, tonometry, indirect ophthalmoscopy, and electroretinogram. Aqueous humor (AH), vitreous humor (VH), and plasma samples were collected. Horses were euthanized 7 or 21 days after injection and eyes enucleated for histopathology. TA concentrations in AH, VH, and plasma were measured by HPLC.
Results Three control eyes and one TA eye developed inflammation after injection or collection of AH. Positive bacterial cultures ( Corynebacterium spp., Staphylococcus spp., and Streptococcus spp.) were obtained from three of these eyes. Other than transient corneal edema in TA injected eyes, which resolved by 7 days after injection, no other changes were observed. TA crystals were visible within the vitreous body. No evidence of TA toxic effect was noted on histopathology. TA was detected in all AH and VH samples from treated eyes following injection. Drug was not detected in the plasma.
Conclusions There was no evidence of overt toxicity from intravitreal TA in normal horses and a single intravitreal injection resulted in TA ocular levels for 21 days. However, the risk for bacterial infections with intravitreal injection or anterior chamber aspirations in horses is high. Use of topical and systemic antibiotics after injection is recommended. 相似文献