首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   634篇
  免费   61篇
  国内免费   5篇
林业   2篇
农学   5篇
  2篇
综合类   128篇
农作物   19篇
水产渔业   4篇
畜牧兽医   382篇
园艺   157篇
植物保护   1篇
  2023年   17篇
  2022年   11篇
  2021年   26篇
  2020年   21篇
  2019年   40篇
  2018年   35篇
  2017年   39篇
  2016年   39篇
  2015年   44篇
  2014年   46篇
  2013年   44篇
  2012年   29篇
  2011年   38篇
  2010年   21篇
  2009年   21篇
  2008年   23篇
  2007年   24篇
  2006年   18篇
  2005年   18篇
  2004年   19篇
  2003年   10篇
  2002年   25篇
  2001年   17篇
  2000年   14篇
  1999年   8篇
  1998年   8篇
  1997年   3篇
  1996年   9篇
  1995年   4篇
  1994年   2篇
  1993年   6篇
  1992年   4篇
  1991年   2篇
  1990年   2篇
  1989年   3篇
  1988年   3篇
  1986年   1篇
  1982年   2篇
  1981年   1篇
  1980年   1篇
  1979年   1篇
  1973年   1篇
排序方式: 共有700条查询结果,搜索用时 46 毫秒
1.
This report describes the use of 99mtechnetium pertechnetate (99mTcO4) and 131[for imaging of a metastatic thyroid carcinoma in a dog. The 131] imaging showed metastatic lesions undetected by the 99mTcO4 imaging on 2 separate occasions. The possible mechanisms for the discrepancies between 131I and 99mTcO4 imaging of thyroid carcinomas are discussed. The use of 131I for the imaging of functional thyroid carcinomas in the dog is recommended.  相似文献   
2.
3.
AIM: To investigate the relationship between osmolarity, cell volume and cell proliferation in nasopharyngeal carcinoma cells. METHODS: MTT method was applied to detect the proliferation ability of the poorly-differentiated nasopharyngeal carcinoma cell (CNE-2Z) under various osmolarity conditions. The flow cytometry was used to analyse cell cycle distribution. Cell volume was obtained by the image analysis of living cells and cell viability was determined by the trypan blue assay. RESULTS: Cultivation of cells under the hypertonic conditions of 370 and 440 mOsmol/L increased cell volume by 8.7% and 27.8% and facilitated cell proliferation by 22.2% and 33.9%, respectively. However, hypotonic incubation of cells with osmolarity of 160 and 230 mOsmol/L decreased cell volume by 12.8% and 4.1% and inhibited cell proliferation by 34.0% and 15.6%, respectively. Cell volume was positively correlated with cell proliferation rate. Long-term cultivation of cells under anisotonic conditions did not significantly alter cell cycle distribution, but hypotonic cultivation decreased cell viability. CONCLUSION: Proliferation of nasopharyngeal carcinoma cells was closely correlated with the osmolarity of culture medium and cell volume. Hypotonic cultivation may inhibit cell proliferation by decreasing cell volume to facilitate cell death mechanisms.  相似文献   
4.
Six cats with an advanced stage squamous cell carcinoma (SCC) of the nasal planum were treated with a combination of superficial radiotherapy and intralesional carboplatin therapy. This multimodality protocol was well tolerated by the majority of cats and resulted in complete responses in all cats (100%). Median follow‐up for all cats is 268 days, and the median time‐to‐recurrence, time‐to‐progression and overall survival have not yet been reached. Our study, although limited in number of animals and with a relatively short median follow‐up compared to other studies for this disease, suggests that a combination of radiotherapy and intralesional carboplatin is a useful treatment option for an advanced stage SCC of the nasal planum in cats and warrants further application of the multimodality approach presented here.  相似文献   
5.
6.
A 9-year-old female sugar glider (Petaurus breviceps) was evaluated for a tissue mass near the marsupium. Ultrasonography identified a vascular mass originating from the right mammary gland. Fine-needle aspiration was suggestive of a malignant neoplasm. The glider was anesthetized and the tumor was removed, and this was followed by strontium-90 plesiotherapy to the tumor bed in an attempt to decrease local recurrence. Histopathology revealed an anaplastic mammary carcinoma. The glider was euthanized less than 14 days after the procedure owing to self-mutilation behavior of unknown etiology. This report is the first to describe the clinical presentation, diagnostics, therapeutics, and treatment response for a sugar glider with mammary neoplasia.  相似文献   
7.
SONG Ling  ZHOU Qiang  LI Na  YU Jie  LI Yang  ZHANG Chi 《园艺学报》2017,33(11):2015-2019
AIM: To investigate the effect of Hedgehog (Hh) signaling pathway on the viability and apoptosis of cervical carcinoma cells by shRNA technique to knock down Smoothened (Smo) gene. METHODS: Smo shRNA was used to transfect the cervical carcinoma HeLa cells. The expression of Smo and Gli1 at mRNA and protein levels in the HeLa cells was determined by RT-PCR and Western blot, respectively. The effect of Smo gene silencing on the growth of the cells was measured by MTT assay. The apoptosis and cell cycle were determined by flow cytometry. RESULTS: Compared with control group, the mRNA and protein expression of Smo and Gli1 were evenly reduced obviously after transfected with Smo shRNA for 72 h (P<0.05). The viability of HeLa cells transfected with Smo shRNA was significantly inhibited. The percentages of the cells in G0/G1 phase and early apoptosis rate were obviously higher in Smo shRNA transfection group than those in control group. CONCLUSION: Smo gene silencing effectively inhibits the cell growth and induces the apoptosis of human cervical carcinoma cells.  相似文献   
8.
This report describes the clinical and histopathological characteristics of a rare mixed germ-cell tumor comprising teratoma and embryonal carcinoma in the left ovary of a 10-month-old four-toed hedgehog, with chief complaints of loss of appetite and lethargy. Laparotomy revealed a swollen left ovary with small disseminated peritoneal nodules, and bilateral ovariohysterectomy was performed. The left ovary had a mature teratoma with well-differentiated fat, bone, cartilage, salivary gland, trachea, keratin cyst, and nervous tissues, and an embryonal carcinoma consisting of poorly-differentiated epithelial cells arranged in tubular, alveolar, or solid patterns. Immunohistochemically, the embryonal carcinoma cells were positive for placental alkaline phosphatase and c-KIT. This is the first case of mature teratoma with embryonal carcinoma in the ovary of a hedgehog.  相似文献   
9.
10.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号