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   380篇
  免费   23篇
  国内免费   1篇
耳鼻咽喉   8篇
儿科学   20篇
妇产科学   6篇
基础医学   78篇
口腔科学   3篇
临床医学   51篇
内科学   51篇
皮肤病学   3篇
神经病学   9篇
特种医学   35篇
外科学   60篇
综合类   4篇
预防医学   16篇
眼科学   1篇
药学   40篇
中国医学   1篇
肿瘤学   18篇
  2023年   8篇
  2022年   6篇
  2021年   12篇
  2020年   5篇
  2019年   5篇
  2018年   9篇
  2017年   6篇
  2016年   12篇
  2015年   15篇
  2014年   12篇
  2013年   20篇
  2012年   14篇
  2011年   12篇
  2010年   6篇
  2009年   15篇
  2008年   21篇
  2007年   14篇
  2006年   11篇
  2005年   8篇
  2004年   10篇
  2003年   4篇
  2002年   4篇
  2000年   4篇
  1999年   5篇
  1998年   14篇
  1997年   11篇
  1996年   14篇
  1995年   6篇
  1994年   12篇
  1993年   8篇
  1992年   8篇
  1991年   5篇
  1990年   5篇
  1989年   4篇
  1988年   8篇
  1987年   13篇
  1986年   6篇
  1985年   6篇
  1984年   5篇
  1983年   3篇
  1982年   4篇
  1981年   2篇
  1980年   4篇
  1979年   3篇
  1978年   2篇
  1977年   5篇
  1975年   2篇
  1972年   2篇
  1964年   3篇
  1962年   1篇
排序方式: 共有404条查询结果,搜索用时 15 毫秒
21.
Four children with tyrosinaemia type 1 received liver transplants. The metabolic disorder was corrected and all four had normal liver function on an unrestricted diet. Two children, transplanted at age five and seven years, proved to have occult hepatocellular carcinoma and both subsequently developed pulmonary metastases. One child was well 32 months after removal of a single pulmonary metastasis but the other child died with multiple metastases. The two younger children, transplanted at age 19 and 21 months, were well 28 and 44 months after operation, one after a second liver transplant. Our experience confirms the high risk of hepatocellular carcinoma in this disease and the potential value of early liver transplantation.  相似文献   
22.
A 19 month old Indian girl with tyrosinaemia developed a severe generalised neuropathy involving both phrenic nerves. Treatment with haemarginate failed to improve her condition. After liver transplantation the raised concentrations of the neurotoxin delta amino-laevulinic acid returned to normal and gradual but complete neurological recovery occurred over a period of 13 months.  相似文献   
23.
24.
25.
26.
The data on biologic effects of nonthermal microwaves (MWs) from mobile telephones are diverse, and these effects are presently ignored by safety standards of the International Commission for Non-Ionizing Radiation Protection (ICNIRP). In the present study, we investigated effects of MWs of Global System for Mobile Communication (GSM) at different carrier frequencies on human lymphocytes from healthy persons and from persons reporting hypersensitivity to electromagnetic fields (EMFs). We measured the changes in chromatin conformation, which are indicative of stress response and genotoxic effects, by the method of anomalous viscosity time dependence, and we analyzed tumor suppressor p53-binding protein 1 (53BP1) and phosphorylated histone H2AX (gamma-H2AX), which have been shown to colocalize in distinct foci with DNA double-strand breaks (DSBs), using immunofluorescence confocal laser microscopy. We found that MWs from GSM mobile telephones affect chromatin conformation and 53BP1/gamma-H2AX foci similar to heat shock. For the first time, we report here that effects of MWs from mobile telephones on human lymphocytes are dependent on carrier frequency. On average, the same response was observed in lymphocytes from hypersensitive and healthy subjects.  相似文献   
27.
28.
A substantial proportion of adults and children in the United States use complementary and alternative health practices, including homeopathy. Many homeopathic therapies are readily available over the counter, and many individuals access and self-administer these therapies with little or no guidance from health care practitioners. In addition, patients and health care providers are often confused by terminologies associated with complementary practices and may be unable to distinguish homeopathy from naturopathy, herbalism, holistic medicine, Ayurveda, traditional Chinese medicine, or other forms of health care. Compared with European and Asian countries, education in the United States about complementary and alternative health practices is not typically found within traditional nursing, midwifery, or medical education curricula. Given this lack of education and the broad acceptance and popularity of homeopathy, it is necessary for health care practitioners to improve their knowledge regarding similarities and differences among therapies so they can fully inform and make appropriate recommendations to patients. The intent of this article is therefore to examine the state of existing science of homeopathy, distinguish it from other complementary methods, and provide midwives and women's health care providers with an introduction to common homeopathic therapies that may be recommended and safely used by persons seeking midwifery care. This review also presents the evidence base, pharmacology, manufacturing, and regulation of homeopathic therapies. We also consider controversies and misunderstandings regarding safety and efficacy of homeopathic remedies relevant to women and birthing persons. Examples of practical applications of homeopathic therapies for use in midwifery practice are introduced. Implications for practice and sample guidelines are included.  相似文献   
29.
Pham  DH; Huang  D; Korwan  A; Greyson  ND 《Radiology》1987,165(1):135-137
Acute bronchial obstruction by mucous plugs may be manifested clinically by dyspnea, hypoxemia, and respiratory alkalosis mimicking pulmonary thromboembolism. In eight cases with complete interruption of ventilation to an entire lung, chest radiography failed to reveal the extent of the obstruction. Perfusion was substantially less affected than ventilation. Routine ventilation-perfusion scintigraphy with technetium-99m DTPA aerosol aids in the diagnosis of acute major bronchial obstruction in patients with suspected pulmonary thromboembolism.  相似文献   
30.
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