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   191811篇
  免费   19311篇
  国内免费   13533篇
耳鼻咽喉   1556篇
儿科学   2316篇
妇产科学   1799篇
基础医学   20615篇
口腔科学   3454篇
临床医学   24983篇
内科学   26610篇
皮肤病学   1978篇
神经病学   9590篇
特种医学   7339篇
外国民族医学   102篇
外科学   19425篇
综合类   36509篇
现状与发展   53篇
一般理论   8篇
预防医学   14398篇
眼科学   5305篇
药学   20235篇
  193篇
中国医学   13170篇
肿瘤学   15017篇
  2025年   52篇
  2024年   2707篇
  2023年   4012篇
  2022年   8006篇
  2021年   10026篇
  2020年   7934篇
  2019年   6274篇
  2018年   6461篇
  2017年   6179篇
  2016年   5774篇
  2015年   8542篇
  2014年   10658篇
  2013年   10217篇
  2012年   14566篇
  2011年   15690篇
  2010年   10834篇
  2009年   8907篇
  2008年   10654篇
  2007年   10469篇
  2006年   10022篇
  2005年   9341篇
  2004年   6687篇
  2003年   6086篇
  2002年   5064篇
  2001年   4316篇
  2000年   4035篇
  1999年   3896篇
  1998年   2474篇
  1997年   2551篇
  1996年   1922篇
  1995年   1789篇
  1994年   1551篇
  1993年   964篇
  1992年   1113篇
  1991年   923篇
  1990年   780篇
  1989年   709篇
  1988年   597篇
  1987年   525篇
  1986年   455篇
  1985年   326篇
  1984年   154篇
  1983年   137篇
  1982年   75篇
  1981年   76篇
  1980年   50篇
  1979年   58篇
  1974年   3篇
  1970年   2篇
  1965年   2篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
61.
C Q Wang  H Q Xu  Z P Luo 《中华内科杂志》1992,30(10):643-5, 660
61 patients with cerebellar hemorrhage were studied. The age at onset ranged from 15 to 84 years with a mean of 57.4 years. 49 cases were treated conservatively and 12 surgically and the mortality rates of the two groups were 32.5% and 25% respectively. Based on this study, it is suggested that the clinical and CT indications of surgical treatment of hematoma are as follows; Severe disturbance of consciousness; Bilateral eyeball fixation; Volume of hematoma over 10 ml; Size of hematoma over 4 cm in diameter; Marked acute obstructive hydrocephalus; Compression of cisterna ambieus and quadrigeminus.  相似文献   
62.
利用仿生化学的原理,本文设计并合成了两个儿茶酚胺类和两个羟基吡啶酮类八配位的螯合剂,初步动物试验表明,具有较强的钚促排能力。  相似文献   
63.
用二甲苯所致的急性炎症模型观察了神效止痛膏的抗急性炎症作用.用扭体法、热板法观察了神效止痛膏对小鼠的镇痛作用.结果表明,神效止痛膏有很好的镇痛作用.  相似文献   
64.
QuantitativerelationshipbetweenpupillaryreflexfeatureanditsdiopterinretinoscopyXuShang(徐上);JiShangnian(计尚年)(DepartmentofOphth...  相似文献   
65.
We have previously shown that neuregulin-1 (NRG-1) protects neurons from ischemic brain injury if administered before focal stroke. Here, we examined the therapeutic window and functional recovery after NRG-1 treatment in rats subjected to 90 mins of middle cerebral artery occlusion (MCAO) and 24 h of reperfusion. Neuregulin-1 (2.5 ng/kg bolus, 1.25 ng/kg/min infusion) reduced infarct volume by 89.2%+/-41.9% (mean+/-s.d.; n=8; P<0.01) if administered immediately after the onset of reperfusion. Neuroprotection was also evident if NRG-1 was administered 4 h (66.4%+/-52.6%; n=7; P<0.01) and 12 h (57.0%+/-20.8%; n=8; P<0.01) after reperfusion. Neuregulin-1 administration also resulted in a significant improvement of functional neurologic outcome compared with vehicle-treated animals (32.1%+/-5.7%; n=9; P<0.01). The neuroprotective effect of the single administration of NRG-1 was seen as long as 2 weeks after treatment. Neurons labeled with the neurodegeneration marker dye Fluoro-JadeB were observed after MCAO in the cortex, but the numbers were significantly reduced after NRG-1 treatment. These results indicate that NRG-1 is a potent neuroprotective compound with an extended therapeutic window that has practical therapeutic potential in treating individuals after ischemic brain injury.  相似文献   
66.
内脏高敏感与功能性胃肠病   总被引:3,自引:0,他引:3  
功能性胃肠病(functional gastrointestinal disorders,FGIDs)是指一组以慢性或反复发作的消化道症状就诊,但无明确胃肠黏膜结构改变或生化异常可查的症候群。心理、社会因素可加重FGIDs患者症状,患者可同时伴有躯体症状[1]。其发病机制目前尚不明确,最初该类疾病被认为是胃肠神经官能症,大量的流行病学资料表明,尽管精神压力与患者症状发作有关,但主要还是决定于患者的就医行为。此后,FGIDs发病机制的研究又集中在胃肠动力改变方面,肠易激综合征患者(IBS)、功能性消化不良患者(FD)、非心源性胸痛患者(NCCP)均发现了各种胃肠动力异…  相似文献   
67.
S D Xu 《中华外科杂志》1990,28(10):588-91, 636
108 pigs were shot at the level of lumbar 1 to investigate the changes of spinal cord in relation to the speed of shooting and the trajectory through which the bullet passed. The cord lesions of the specimens could be divided, according to its severity, into 4 grades: (1) transection in 41; (2) complete destruction in 43; both lesion 1&2 resulted in permanent paraplegia; (3) incomplete destruction in 13, those resulted in incomplete paraplegia eventually recovered; (4) mild damage, that was concussion in 11, resumed perfectly. Through a transducer sealed into the spinal canal, the intracanal pressure was recorded: (1) Shooting through spinal canal with a pressure over 5 kg caused cord transection. (2) shooting through canal wall with a pressure of 2.5 to 5; 0 kg caused complete cord destruction. (3) shooting nearby the outer margin of vertebra with a pressure less than 1.0 kg caused mild cord damage. It was found that the speed of bullet, the trajectory with relation to cord and the grade of cord lesion are in agreement with each other. The mutual effects among them would make one think it reasonable to classify cord injury as follows: 1. Injury from bullet through spinal canal or vertebral body usually causes cord transaction; 2. Injury from bullet through canal wall at high speed would make a chance of complete destruction in 94%; at low speed, a chance of either complete or incomplete lesion in 50% each. 3. Injury nearby vertebra, high speed bullet would cause a chance of complete cord lesion in 86%; low speed one would make a chance of incomplete lesion in 1/3 and mild lesion in 2/3.  相似文献   
68.
H T Xu  S L Chen  L S Li 《中西医结合杂志》1990,10(12):737-9, 710
In 24 open-chest mongrel dogs, coronary artery critical stenosis were produced by a micrometer constriction on left circumflex coronary artery. It was reduction about 87% in lumen area. CBF, -Vce, -dp/dt max were decreased, T was increased (P less than 0.01). 15 minutes after stenosis, the Salvia miltiorrhiza injection was injected into left atrium. CBF, -dp/dt max, -Vce were increased and T was decreased after the injection of Salvia miltiorrhiza. Moreover, the change of CBF was the earliest. The results proved that the Salvia miltiorrhiza could improve the left ventricular diastolic function in coronary artery stenosis.  相似文献   
69.
70.
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