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   179794篇
  免费   1355篇
  国内免费   13篇
耳鼻咽喉   1168篇
儿科学   6744篇
妇产科学   3195篇
基础医学   17025篇
口腔科学   1626篇
临床医学   12842篇
内科学   31743篇
皮肤病学   747篇
神经病学   16692篇
特种医学   9157篇
外科学   29525篇
综合类   2435篇
一般理论   6篇
预防医学   18471篇
眼科学   2875篇
药学   9746篇
中国医学   654篇
肿瘤学   16511篇
  2021年   84篇
  2020年   60篇
  2019年   86篇
  2018年   21986篇
  2017年   17413篇
  2016年   19552篇
  2015年   945篇
  2014年   861篇
  2013年   892篇
  2012年   7105篇
  2011年   21199篇
  2010年   18889篇
  2009年   11629篇
  2008年   19688篇
  2007年   21912篇
  2006年   783篇
  2005年   2380篇
  2004年   3603篇
  2003年   4501篇
  2002年   2706篇
  2001年   326篇
  2000年   462篇
  1999年   225篇
  1998年   273篇
  1997年   258篇
  1996年   150篇
  1995年   143篇
  1994年   132篇
  1993年   115篇
  1992年   84篇
  1991年   126篇
  1990年   169篇
  1989年   114篇
  1988年   83篇
  1987年   87篇
  1986年   72篇
  1985年   82篇
  1984年   84篇
  1983年   100篇
  1982年   84篇
  1981年   60篇
  1980年   96篇
  1978年   66篇
  1977年   63篇
  1976年   58篇
  1975年   54篇
  1974年   67篇
  1938年   69篇
  1932年   72篇
  1930年   54篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.

Objective  

The aim of the project was to assess the effectiveness and safety of weekly epoetin-beta (EB) in patients with gastrointestinal cancer (GIC) subjected to concomitant chemoradiotherapy (CCTRT).  相似文献   
72.
Extravasation of chemotherapy is a feared complication of anticancer therapy. The accidental leakage of cytostatic agents into the perivascular tissues may have devastating short-term and long-term consequences for patients. In recent years, the increased focus on chemotherapy extravasation has led to the development of international guidelines that have proven useful tools in daily clinical practice. Moreover, the tissue destruction in one of the most dreaded types of extravasation (ie, anthracycline extravasation) now can effectively be prevented with a specific antidote, dexrazoxane.  相似文献   
73.
Hypoxia is related to poor prognosis because it is associated to chemo-and radioresistance. During recent years the evolution of imaging methods like PET/CT and MRI has meant the appearance of new perspectives with direct implications in radiation therapy. We discuss previous experiences in staging, planning and in the follow-up process with these techniques for measuring tumour hypoxia.  相似文献   
74.

Background  

Bortezomib, a proteasome-specific inhibitor, has emerged as a promising cancer therapeutic agent. However, development of resistance to bortezomib may pose a challenge to effective anticancer therapy. Therefore, characterization of cellular mechanisms involved in bortezomib resistance and development of effective strategies to overcome this resistance represent important steps in the advancement of bortezomib-mediated cancer therapy.  相似文献   
75.

Background  

The fibromyalgia syndrome (FMS) is suggested to be a manifestation of depression or affective spectrum disorder. We measured the cognitive style of patients with FMS to assess personality styles in 44 patients with fibromyalgia syndrome (FMS) by comparing them with 43 patients with major depressive disorder (MDD) and 41 healthy controls (HC).  相似文献   
76.
77.
78.
79.
Introduction Choroid plexus cysts can lead to isolation of the lateral ventricles and distension of the third ventricle. We present an ultrasonographic video documentation of an infant with variably shaped and localized choroid plexus cyst of the third ventricle. Case report An infant had periods of increased intracranial pressure with changing dilatation of the first to third ventricle. Cerebral ultrasonography of the not crying boy demonstrated a choroid plexus cyst limply hanging down from the roof of the third ventricle to the beginning of the aqueduct of Sylvius. During crying, the cyst prolapsed from the third into left lateral ventricle and was strangled by the foramen of Monro. Endoscopic cyst fenestration and third ventriculostomy continuously solved the problem of intermittent hydrocephalus occlusus. Conclusion Depending not only on localization and size but also on cyst form and cerebrospinal fluid pressure, a single choroid plexus cyst can cause various obstructions of cerebrospinal fluid pathways.  相似文献   
80.
Introduction Iniencephaly, a neural tube defect involving occiput and inion and combined with rachischisis of the cervical, thoracic spine, and retroflexion position of the head is a very rare congenital abnormality of the fetus–newborn with a 0.1–10 of 10,000 prevalence. This abnormality’s prognosis is thought to be dismal. This abnormality can be associated with other abnormalities such as anencephaly, encephalocele, hydrocephalus, cyclopia, absence of the mandible, cleft lip and palate, cardiovascular disorders, diaphragmatic hernia, renal abnormalities, overgrowth of the arms compared to the legs, and club food and gastrointestinal atresia. Discussion Most of the patients are dead born, and the others die in a few hours. There are only six previously documented long-term survivors. In our case, our patient with iniencephalic signs and findings is still living. She is 2 years old now. We think that this patient presents a mild form of iniencephaly.  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