全文获取类型
| 收费全文 | 330篇 |
| 免费 | 59篇 |
| 国内免费 | 26篇 |
专业分类
| 林业 | 6篇 |
| 农学 | 48篇 |
| 2篇 | |
| 综合类 | 74篇 |
| 农作物 | 23篇 |
| 水产渔业 | 16篇 |
| 畜牧兽医 | 232篇 |
| 园艺 | 7篇 |
| 植物保护 | 7篇 |
出版年
| 2023年 | 4篇 |
| 2021年 | 8篇 |
| 2020年 | 15篇 |
| 2019年 | 15篇 |
| 2018年 | 17篇 |
| 2017年 | 18篇 |
| 2016年 | 17篇 |
| 2015年 | 13篇 |
| 2014年 | 10篇 |
| 2013年 | 13篇 |
| 2012年 | 16篇 |
| 2011年 | 12篇 |
| 2010年 | 18篇 |
| 2009年 | 21篇 |
| 2008年 | 27篇 |
| 2007年 | 16篇 |
| 2006年 | 23篇 |
| 2005年 | 17篇 |
| 2004年 | 16篇 |
| 2003年 | 5篇 |
| 2002年 | 13篇 |
| 2001年 | 13篇 |
| 2000年 | 12篇 |
| 1999年 | 11篇 |
| 1998年 | 2篇 |
| 1997年 | 7篇 |
| 1996年 | 5篇 |
| 1995年 | 4篇 |
| 1994年 | 4篇 |
| 1993年 | 9篇 |
| 1992年 | 9篇 |
| 1991年 | 3篇 |
| 1990年 | 4篇 |
| 1989年 | 3篇 |
| 1988年 | 4篇 |
| 1987年 | 5篇 |
| 1984年 | 1篇 |
| 1983年 | 1篇 |
| 1982年 | 1篇 |
| 1980年 | 2篇 |
| 1976年 | 1篇 |
排序方式： 共有415条查询结果，搜索用时 15 毫秒
71.
Neoplastic pleural effusion and intrathoracic metastasis of a scapular osteosarcoma in a dog: a multidisciplinary integrated diagnostic approach 
下载免费PDF全文
下载免费PDF全文 Luis Mesquita Jeremy Mortier Lorenzo Ressel Riccardo Finotello Paolo Silvestrini Martina Piviani 《Veterinary clinical pathology / American Society for Veterinary Clinical Pathology》2017,46(2):337-343
A 10‐year‐old, female spayed mixed‐breed or cross‐bred dog was referred to the Small Animal Teaching Hospital of the University of Liverpool due to tachypnea, dyspnea, and pleural effusion not responding to diuretics and antibiotics. The chest was drained and cytology of the pleural fluid was consistent with a modified transudate with presence of atypical cells initially attributed to mesothelial hyperplasia and dysplasia. Computed tomography detected, in addition to the bilateral pleural effusion, diffuse pleural thickening, multiple pleural and pulmonary nodules, and a mineralized and lytic mass in the left scapula. Imaging findings were suggestive of a primary bone tumor with intrathoracic metastasis. Cytology of the left scapular and pleural masses revealed a malignant neoplasm highly suggestive of osteosarcoma. The diagnosis was confirmed by demonstration of a positive cytochemical reaction for alkaline phosphatase on prestained cytology slides. This finding prompted review of the initial interpretation of the pleural effusion cytology. The presence of neoplastic osteoblasts in the thoracic fluid was identified by a combination of cytochemistry, cell pellet immunohistochemistry, and transmission electron microscopy findings. In this report, a multidisciplinary integrated diagnostic approach was used to diagnose and confirm a neoplastic pleural effusion due to osteosarcoma metastasis in a dog. 相似文献
72.
73.
74.
75.
滇牡丹Paeonia delavayi是中国西南地区特有种,其分类一直存在争议。回顾了滇牡丹的分类历史和分类处理,综述了滇牡丹在细胞学及分子生物学的研究现状及进展,着重介绍了滇牡丹的染色体核型、Giemsa C-带、同工酶生化标记、分子标记及基因序列测定等研究成果,认为染色体核型、Giemsa C-带、同工酶生化标记、分子标记等结果支持将滇牡丹复合群归并为滇牡丹一个种的分类处理,基因序列分析只涉及滇牡丹的2个居群,认为二者亲缘关系很近。表1参42 相似文献
76.
Relationships between endometrial cytology and interval to first ovulation, and pregnancy in postpartum dairy cows in a single herd 总被引：1，自引：0，他引：1
The objectives were to investigate the relationships between endometrial cytology (EC) and interval from calving to first ovulation, and pregnancy in dairy cows, and that between uterine fluid and EC. On day 25 postpartum, 39 dairy cows were grouped based on EC, as having low (?8%) or high (>8%) polymorphonuclear cells (PMN), and the quantity of uterine fluid was assessed by ultrasound. The interval from calving to first ovulation was shorter in low, than in high PMN cows (32 vs. 45 d). A greater proportion of cows with uterine fluid had high PMN (64% vs. 21%), and the PMN increased from 14% to 34% as the quantity of uterine fluid increased. The mean interval from calving to ovulation was longer in primiparous cows with high PMN (49 d) compared to that of primiparous and multiparous cows with low PMN (28 and 29 d, respectively). Although the conception rate to first service at 92 d postpartum was not different between PMN groups, the cumulative pregnancy at 270 d tended to be higher in low than in high PMN (80% vs. 58%) multiparous cows. Also, cows that had uterine fluid on day 25 postpartum had a shorter interval from calving to pregnancy than those with no uterine fluid (161 vs. 208 d). In conclusion, combining transrectal ultrasonography with endometrial cytology on day 25 postpartum has diagnostic value in the assessment of uterine inflammation. 相似文献
77.
Tara L. Piech Jared A. Jaffey Eric T. Hostnik Mary E. White 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2020,34(4):1582-1586
This is a case of coccidioidomycosis in a dog, examined for vomiting and labored breathing. Physical examination and thoracic and abdominal imaging revealed pleural and peritoneal effusions, both of which exhibited neutrophilic inflammation with a substantial eosinophilic component. The dog had positive IgM and IgG coccidioidomycosis titers at initial evaluation. The eosinophilic component of the inflammation was attributed to coccidioidomycosis. The dog underwent approximately 6 months of fluconazole treatment, with both effusions and clinical signs improving after 6 weeks. Three months after cessation of antifungal treatment, the dog developed a mid-diaphyseal lytic and proliferative lesion in the left radius caused by Coccidioides spp. This case illustrates the importance of consideration of coccidioidomycosis when an eosinophilic cavitary effusion is present in dogs that live in or have traveled to endemic regions. 相似文献
78.
79.
对东方百合二、四倍体杂交获得的种子萌发进行了统计及相关的比较研究,并对其杂交后代进行了细胞学观察研究。试验结果表明,东方百合二、四倍体杂交获得的种子可育性低,并有很大差异,获得的植株出现了二倍化。 相似文献