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   184188篇
  免费   1473篇
  国内免费   50篇
耳鼻咽喉   1214篇
儿科学   6871篇
妇产科学   3121篇
基础医学   17876篇
口腔科学   1788篇
临床医学   13196篇
内科学   32556篇
皮肤病学   899篇
神经病学   17389篇
特种医学   9383篇
外科学   29992篇
综合类   2349篇
一般理论   2篇
预防医学   18525篇
眼科学   2862篇
药学   10067篇
中国医学   641篇
肿瘤学   16980篇
  2023年   45篇
  2022年   98篇
  2021年   196篇
  2020年   128篇
  2019年   185篇
  2018年   22110篇
  2017年   17485篇
  2016年   19712篇
  2015年   1163篇
  2014年   1144篇
  2013年   1149篇
  2012年   7549篇
  2011年   21536篇
  2010年   19158篇
  2009年   11872篇
  2008年   19992篇
  2007年   22194篇
  2006年   1168篇
  2005年   2770篇
  2004年   3936篇
  2003年   4875篇
  2002年   2949篇
  2001年   383篇
  2000年   501篇
  1999年   251篇
  1998年   343篇
  1997年   285篇
  1996年   157篇
  1995年   167篇
  1994年   164篇
  1993年   109篇
  1992年   87篇
  1991年   123篇
  1990年   158篇
  1989年   114篇
  1988年   87篇
  1987年   79篇
  1986年   48篇
  1985年   58篇
  1984年   56篇
  1983年   59篇
  1982年   51篇
  1980年   67篇
  1978年   37篇
  1939年   32篇
  1938年   77篇
  1937年   36篇
  1934年   40篇
  1932年   71篇
  1930年   58篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
Abstract We report a case of SMV injury in a critically ill patient. The patient was a 19-year-old woman involved in a motor vehicle collision. Her injuries included grade II splenic and renal lacerations, devascularized and lacerated right and transverse colon, a transected transverse mesocolon, a massive shear injury of her abdominal wall, and two partial SMV transections. At initial damage control laparotomy, the SMV was ligated, the devascularized bowel resected and a temporary abdominal closure applied. At re-operation, a mesocaval shunt using saphenous vein was employed. The shunt failed and the patient required a saphenous vein jump graft. Although visceral vascular injuries are rare, ligation of the SMV in a damage control situation is acceptable. This case study is the first to discuss appropriate treatment when interruption to a patient's collateral visceral venous drainage limits the surgeon’s ability to ligate. In these situations, bypass shunts may be successful.  相似文献   
32.
For persons battling HIV/AIDS a stable place to live may decide the length and quality of life itself. It is nearly impossible for a person on the streets to engage in a needed continuous AIDS treatment regimen when the very basic question of where that person will rest his or her head when darkness comes in just a few hours is unresolved. When danger lurks on the streets, when cold numbs the limbs, when tiredness overwhelms the mind, when fear breaks the spirit, a place to call home would make all the difference.  相似文献   
33.
34.

Background  

Reports on childhood cancer survivors estimated cumulative probability of developing secondary neoplasms vary from 3,3% to 25% at 25 years from diagnosis, and the risk of developing another cancer to several times greater than in the general population.  相似文献   
35.
36.

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   
37.
38.
39.
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   
40.
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