全文获取类型
| 收费全文 | 1866篇 |
| 免费 | 11篇 |
专业分类
| 林业 | 43篇 |
| 农学 | 31篇 |
| 基础科学 | 17篇 |
| 205篇 | |
| 综合类 | 440篇 |
| 农作物 | 70篇 |
| 水产渔业 | 136篇 |
| 畜牧兽医 | 851篇 |
| 园艺 | 23篇 |
| 植物保护 | 61篇 |
出版年
| 2022年 | 10篇 |
| 2021年 | 8篇 |
| 2020年 | 16篇 |
| 2019年 | 18篇 |
| 2018年 | 25篇 |
| 2017年 | 36篇 |
| 2016年 | 43篇 |
| 2015年 | 25篇 |
| 2014年 | 44篇 |
| 2013年 | 69篇 |
| 2012年 | 85篇 |
| 2011年 | 106篇 |
| 2010年 | 43篇 |
| 2009年 | 29篇 |
| 2008年 | 93篇 |
| 2007年 | 102篇 |
| 2006年 | 133篇 |
| 2005年 | 110篇 |
| 2004年 | 96篇 |
| 2003年 | 116篇 |
| 2002年 | 108篇 |
| 2001年 | 36篇 |
| 2000年 | 43篇 |
| 1999年 | 38篇 |
| 1998年 | 9篇 |
| 1997年 | 14篇 |
| 1996年 | 15篇 |
| 1995年 | 12篇 |
| 1994年 | 15篇 |
| 1993年 | 13篇 |
| 1992年 | 18篇 |
| 1991年 | 18篇 |
| 1990年 | 17篇 |
| 1989年 | 13篇 |
| 1988年 | 15篇 |
| 1987年 | 17篇 |
| 1986年 | 18篇 |
| 1985年 | 18篇 |
| 1984年 | 17篇 |
| 1983年 | 17篇 |
| 1982年 | 8篇 |
| 1978年 | 10篇 |
| 1977年 | 9篇 |
| 1976年 | 8篇 |
| 1975年 | 12篇 |
| 1974年 | 15篇 |
| 1973年 | 16篇 |
| 1972年 | 22篇 |
| 1969年 | 13篇 |
| 1965年 | 7篇 |
排序方式： 共有1877条查询结果，搜索用时 15 毫秒
1.
Dennis FG 《Science (New York, N.Y.)》1967,156(3771):71-73
An extract of immature Wealthy apple seeds, containing substances with gibberellin activity, was applied to unpollinated blossoms of the same variety, resulting in the production of mature seedless fruits. The implications with respect to the normal process of fruit-set are discussed. 相似文献
2.
3.
4.
5.
Jannika Fuchs Andreas Moritz Esther Grußendorf Jörg Lechner Felix Neuerer Rafael Nickel Thomas Rieker Claudia Schwedes Dennis B. DeNicola James Russell Natali Bauer 《Veterinary clinical pathology / American Society for Veterinary Clinical Pathology》2017,46(4):558-568
Background
Reticulocyte hemoglobin content provided by the Siemens ADVIA (CHr) is an established marker of iron deficiency. The IDEXX ProCyte Dx hematology analyzer now provides a similar variable, reticulocyte hemoglobin equivalent (RET‐He).Objectives
The objective was to evaluate RET‐He and its diagnostic utility in dogs, and to calculate a cutoff value for diagnosing iron‐deficient erythropoiesis (IDE). Furthermore, the prevalence of RET‐He values below this cutoff value was established.Methods
One hundred and seventy‐one CBCs of healthy dogs were used to establish a RI. Stability of RET‐He was evaluated by repeated measurements over 48 hours (n = 10). The 25‐run coefficient of variation (CV) was calculated, and correlation and bias between measurements of RET‐He and CHr were assessed (n = 190). A cutoff value for diagnosing IDE was calculated. The utility of RET‐He in the detection of IDE was evaluated in 123 dogs. The prevalence of low RET‐He values was assessed retrospectively in a multicenter study (2012–2014) under participation of 7 veterinary clinics.Results
Reticulocyte hemoglobin equivalent with an RI of 22.2 to 28.6 pg was statistically stable over 48 hours (P = .10). The CV was 1.8%. A fair correlation (ρ = 0.74) between RET‐He and CHr with a small bias of ?0.6 pg was found. The cutoff value for diagnosing IDE was 20.9 pg (sensitivity: 85%; specificity: 99%). The prevalence of RET‐He values below 20.9 pg was 10.3% (1084/10,553 dogs).Conclusions
RET‐He on the ProCyte Dx is a precise screening tool in dogs to detect iron‐deficient erythropoiesis. 相似文献6.
Robert A Kunkle Eric M Nicholson Semakaleng Lebepe-Mazur Dennis L Orcutt Megan L Srinivas Justin J Greenlee David P Alt Amir N Hamir 《Journal of veterinary diagnostic investigation》2008,20(4):522-526
Scrapie is a naturally occurring fatal neurodegenerative disease of adult sheep and goats, one of a group of mammalian diseases known as transmissible spongiform encephalopathies (TSE) or prion diseases. Immunoassays that identify disease-associated prion protein (PrP Sc) are integral to the diagnosis of scrapie and other prion diseases. Results obtained by either immunohistochemistry (IHC) or Western blot (WB) assay are generally adequate for the definitive diagnosis. Approved or accepted methods for WB diagnosis of TSEs requires the use of fresh or frozen nonfixed tissue samples, whereas formalin-fixed, paraffin-embedded tissue is required for the localization of PrP Sc by IHC. Because disparate processing methods are used for these accepted diagnostic techniques, separate tissue samples are collected from the same animal. Occasions arise in which there is either insufficient quantity of tissue available to complete analysis by both techniques or initial tissue processing is incompatible with one of the assays. Also, results between the assays may differ because of the vagaries of sampling, especially in case material that contains moderate-to-low levels of PrP Sc. The present article describes a method to conduct a WB assay from the same paraffin-embedded brainstem sample used for the IHC diagnosis of experimentally induced sheep scrapie. 相似文献
7.
8.
9.
A R Olsen 《Journal of the Association of Official Analytical Chemists》1984,67(6):1035-1036
Examination of excreta pellets from commensal shrew (Suncus murinus) and tropical house geckos (Gekkonidae) showed several characteristics that were useful in distinguishing these pellets from those of commensal rodents. Commensal shrew pellets contained a large number of embedded insect fragments but no embedded hairs. Each shrew pellet was associated with a distinctive circular stain on the floor or container surface where it was found. Gecko pellets were composed entirely of tightly packed insect fragments with no intervening matrix. In contrast to both shrew and rodent pellets, there was no surface mucous coating. A small white body containing uric acid adhered to one end of each gecko pellet. 相似文献
10.