全文获取类型
收费全文 | 7956篇 |
免费 | 476篇 |
国内免费 | 4篇 |
专业分类
林业 | 632篇 |
农学 | 325篇 |
基础科学 | 40篇 |
2091篇 | |
综合类 | 482篇 |
农作物 | 498篇 |
水产渔业 | 750篇 |
畜牧兽医 | 2814篇 |
园艺 | 143篇 |
植物保护 | 661篇 |
出版年
2024年 | 7篇 |
2023年 | 92篇 |
2022年 | 111篇 |
2021年 | 265篇 |
2020年 | 279篇 |
2019年 | 255篇 |
2018年 | 316篇 |
2017年 | 338篇 |
2016年 | 317篇 |
2015年 | 262篇 |
2014年 | 345篇 |
2013年 | 526篇 |
2012年 | 672篇 |
2011年 | 636篇 |
2010年 | 335篇 |
2009年 | 275篇 |
2008年 | 531篇 |
2007年 | 534篇 |
2006年 | 408篇 |
2005年 | 388篇 |
2004年 | 309篇 |
2003年 | 323篇 |
2002年 | 278篇 |
2001年 | 105篇 |
2000年 | 92篇 |
1999年 | 58篇 |
1998年 | 33篇 |
1997年 | 31篇 |
1996年 | 20篇 |
1995年 | 19篇 |
1994年 | 23篇 |
1993年 | 25篇 |
1992年 | 14篇 |
1991年 | 8篇 |
1990年 | 17篇 |
1989年 | 19篇 |
1988年 | 14篇 |
1987年 | 11篇 |
1986年 | 7篇 |
1985年 | 10篇 |
1984年 | 14篇 |
1983年 | 9篇 |
1982年 | 6篇 |
1981年 | 6篇 |
1980年 | 8篇 |
1974年 | 6篇 |
1973年 | 4篇 |
1969年 | 7篇 |
1968年 | 6篇 |
1966年 | 6篇 |
排序方式: 共有8436条查询结果,搜索用时 15 毫秒
71.
72.
73.
74.
75.
76.
Use of Non‐invasive Methods for Evaluating the Testicular Biometry in Collared Peccaries (Pecari tajacu Linnaeus, 1758)
下载免费PDF全文
![点击此处可从《Anatomia, histologia, embryologia》网站下载免费的PDF全文](/ch/ext_images/free.gif)
G. C. X. Peixoto M. A. Silva G. L. Lima L. B. Campos A. L. C. Paiva V. V. Paula A. R. F. Ricarte A. R. Silva 《Anatomia, histologia, embryologia》2016,45(1):60-66
The aim of this study was to compare the accuracy of two methods used to estimate testicular volume in the collared peccary. Calliper and ultrasonographic measurements of testicular dimensions (length, width and height) of both testes were taken on five adult collared peccaries. The testicular volume was calculated by Lambert's empiric formula: length (L) × width (W) × height (H) × 0.71, the formula of an ellipsoid L × W × H × 0.52, and Hansen's formula: L × W2 × 0.52. The calculated volumes were then compared with the actual ones, which were estimated by water displacement. The mean of true testicular volume was 22.65 ± 1.52 ml. Lambert's formula estimated testicular volume more accurately when ultrasound measurements were taken. However, when the calliper was the methodology used, the results were closest to the true volume, especially when Ellipsoid formula and Hansen's formula were applied, and underestimated the true volumes by 1.53 ± 1.75 ml and 1.53 ± 1.65 ml, respectively. This specific application of technologies in wild animals has the potential to revolutionize the selection process for the collared peccary entering artificial insemination or natural breeding programmes. 相似文献
77.
78.
Melpomeni K. Tangalidi Ioannis L. Oikonomidis Dimitra Psalla Serafim Papadimitriou Maria Kritsepi‐Konstantinou Mathios E. Mylonakis 《Veterinary clinical pathology / American Society for Veterinary Clinical Pathology》2016,45(4):710-714
A 5.5‐year‐old, intact male Rottweiler dog was admitted with a history of multifocal nodular tongue lesions which progressively deteriorated during the previous year. Physical examination revealed several reddish nodules with central depression on the surface of the tongue in an otherwise healthy dog. Clinicopathologic abnormalities included eosinophilia and hyperproteinemia. Lingual nodule cytopathology, histopathology, and immunohistochemistry revealed Leishmania spp. amastigotes and a severe granulomatous glossitis. The dog was also seroreactive to L infantum antigens by an indirect immunofluorescence assay. Clinical reevaluation 3 months after the institution of treatment with allopurinol and miltefosine indicated that the nodular lesions had completely regressed. In endemic areas, lingual nodular lesions may rarely be the sole clinical sign of canine leishmaniosis. Standard medical treatment may provide an excellent prognosis. 相似文献
79.
Long‐term follow‐up of renal function assessing serum cystatin C in dogs with diabetes mellitus or hyperadrenocorticism
下载免费PDF全文
![点击此处可从《Veterinary clinical pathology / American Society for Veterinary Clinical Pathology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
80.
Detection of bacterial contamination and DNA quantification in stored blood units in 2 veterinary hospital blood banks
下载免费PDF全文
![点击此处可从《Veterinary clinical pathology / American Society for Veterinary Clinical Pathology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Valentina Stefanetti Arianna Miglio Katia Cappelli Stefano Capomaccio Elisa Sgariglia Maria L. Marenzoni Maria T. Antognoni Mauro Coletti Vittorio Mangili Fabrizio Passamonti 《Veterinary clinical pathology / American Society for Veterinary Clinical Pathology》2016,45(3):406-410
Blood transfusions in veterinary medicine have become increasingly more common and are now an integral part of lifesaving and advanced treatment in small and large animals. Important risks associated with transfusion of blood products include the transmission of various infectious diseases. Several guidelines suggest what infectious agents to screen for in canine and feline transfusion medicine. However, while the risk of bacterial contamination of blood products during storage and administration has not been documented in veterinary medicine, it has emerged as a cause of morbidity and mortality in human transfusion medicine. Clinical experience shows that the majority of blood component bacterial contaminations are caused by only a few species. Unlike other types of bacteria, psychrotolerant species like Pseudomonas spp. and Serratia spp. can proliferate during the storage of blood units at 4°C from a very low titer at the time of blood collection to a clinically significant level (> 105 CFU/mL) causing clinical sepsis resulting from red blood cell concentrate transfusions in human medicine. The purpose of this report was to describe the detection and quantification procedures applied in 4 cases of bacterial contamination of canine and feline blood units, which suggest the need for further investigations to optimize patients’ safety in veterinary transfusion medicine. 相似文献