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   1386篇
  免费   43篇
  国内免费   6篇
耳鼻咽喉   10篇
儿科学   10篇
妇产科学   6篇
基础医学   115篇
口腔科学   17篇
临床医学   103篇
内科学   478篇
皮肤病学   3篇
神经病学   50篇
特种医学   92篇
外科学   274篇
综合类   3篇
预防医学   27篇
眼科学   3篇
药学   86篇
中国医学   3篇
肿瘤学   155篇
  2023年   12篇
  2022年   14篇
  2021年   22篇
  2020年   17篇
  2019年   11篇
  2018年   25篇
  2017年   14篇
  2016年   30篇
  2015年   25篇
  2014年   24篇
  2013年   32篇
  2012年   54篇
  2011年   56篇
  2010年   38篇
  2009年   31篇
  2008年   51篇
  2007年   68篇
  2006年   63篇
  2005年   57篇
  2004年   70篇
  2003年   58篇
  2002年   70篇
  2001年   77篇
  2000年   66篇
  1999年   63篇
  1998年   26篇
  1997年   19篇
  1996年   7篇
  1995年   15篇
  1994年   13篇
  1993年   6篇
  1992年   40篇
  1991年   25篇
  1990年   26篇
  1989年   28篇
  1988年   26篇
  1987年   17篇
  1986年   23篇
  1985年   14篇
  1984年   14篇
  1983年   11篇
  1981年   5篇
  1980年   7篇
  1979年   7篇
  1978年   6篇
  1971年   5篇
  1970年   6篇
  1969年   5篇
  1967年   7篇
  1966年   6篇
排序方式: 共有1435条查询结果,搜索用时 0 毫秒
1.
2.
We report herein the case of a 75-year-old man who developed anal canal metastasis from squamous cell carcinoma of the lung. Initially, he underwent a right middle and lower lobectomy combined with left atrial wall resection under cardiopulmonary bypass. He presented 3 months later with an anal polyp which had prolapsed and bled, for which he underwent a transanal polypectomy. Histologically, the polyp was classified as squamous cell carcinoma and considered to be a metastasis from the primary lung cancer. He is presently well with no signs of recurrence 9 months after his initial operation. To our knowledge, there has been no other case of anal metastasis from lung cancer ever reported.  相似文献   
3.
4.
5.
In ten male mongrel dogs, blood flow was measured in the common hepatic artery (CHA), portal vein (PV) and liver tissue before and after the injection of vasoactive substances: angiotensin II (1.0 micrograms/kg), prostaglandin F2 alpha (1.0 micrograms/kg) and vasopressin (0.1 Unit/kg), under observation of the systemic circulation. Each injection caused a biphasic response in CHA blood flow, an initial decrease followed by a marked increase, while PV blood flow decreased. Liver tissue blood flow was reduced just after injection, but soon returned to a normal level. The duration of action was the shortest with prostaglandin F2 alpha and the longest with vasopressin. In using vasoactive substances in pharmaco-angiography, it is important to consider the biphasic response in CHA blood flow as well as the duration of action of these substances.  相似文献   
6.
The case to be reported is that of a 72-year-old woman with isolated adrenocorticotropic hormone (ACTH) deficiency, who complained of anorexia and generalized malaise. The secretions of human growth hormone(HGH), prolactin (PRL), luteinizing hormone (LH), follicle stimulating hormone (FSH), and thyroid stimulating hormone (TSH) were all within normal limit. In spite of the extremely low level of Cortisol, the plasma level of AGTH would not rise sufficiently, but a marked response of Cortisol to AGTH stimulation was recognizaed. The postmortem examination revealed a decrease In basophilic or PAS-positive cells of the anterior pituitary gland which also showed a selective loss of AGTH-secreting cells over immunohistochemical study. Electron microscope could easily visualize somatotroph, mammotroph, thyrotroph, FSH- and LH-gonadtroph, but corticotroph was difficult to be discerned. Adrenocortical cells demonstrated atrophy and degeneration, for which the zona fasciculata and zona reticularis were narrowed. The zona glomerulosa was slightly enlarged In width.  相似文献   
7.
8.
There is a medicine chest with design of Chrysanthemums in Makie made for Edo-era and handed down in the Takaya family, doctors of Sendai-han. Many kinds of crude drugs, named by one Chinese character, are kept in this chest. They were classified into three types, namely, [Japanese characters]. Identification of these crude drugs was carried out and the meaning of the classification was brought up as a question.  相似文献   
9.
We describe herein the case of a 51-year-old woman in whom metastatic tumor seeding of the percutaneous transhepatic biliary drainage tract occurred following a pancreatoduodenectomy for carcinoma of the distal common bile, duct. An abdominal computed tomography scan done 6 months after the initial operation detected a hepatic lesion located at the site of the previous percutaneous transhepatic biliary drainage tract. Implantation of bile duct carcinoma in the drainage tract was diagnosed, and the recurrent tumor was successfully resected by performing a subsegmentectomy of segment 3 and removal of the adjacent abdominal wall. At present, 5 years and 4 months after the second resection, the patient is in good health without any signs of recurrence. This case report demonstrates that an aggressive surgical approach should be performed for tumor seeding of a transhepatic biliary catheter tract.  相似文献   
10.
Esophageal motor disorders can be primarily focused in the esophagus or secondarily related to a systemic disease. Based on the manometric findings, primary esophageal motor disorders can also be classified into achalasia and spastic disorders, such as diffuse esophageal spasm, nutcracker esophagus, hypertensive lower esophageal sphincter, and nonspecific esophageal motility disorders.  相似文献   
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