全文获取类型
收费全文 | 235746篇 |
免费 | 10210篇 |
国内免费 | 3888篇 |
专业分类
耳鼻咽喉 | 2319篇 |
儿科学 | 8068篇 |
妇产科学 | 3258篇 |
基础医学 | 24411篇 |
口腔科学 | 4757篇 |
临床医学 | 21825篇 |
内科学 | 43924篇 |
皮肤病学 | 3387篇 |
神经病学 | 18641篇 |
特种医学 | 5999篇 |
外国民族医学 | 3篇 |
外科学 | 32852篇 |
综合类 | 22015篇 |
现状与发展 | 3篇 |
一般理论 | 4篇 |
预防医学 | 13817篇 |
眼科学 | 4203篇 |
药学 | 23856篇 |
118篇 | |
中国医学 | 10433篇 |
肿瘤学 | 5951篇 |
出版年
2023年 | 1719篇 |
2022年 | 3653篇 |
2021年 | 5826篇 |
2020年 | 4624篇 |
2019年 | 15372篇 |
2018年 | 14843篇 |
2017年 | 8461篇 |
2016年 | 3991篇 |
2015年 | 3667篇 |
2014年 | 7212篇 |
2013年 | 9201篇 |
2012年 | 6563篇 |
2011年 | 6741篇 |
2010年 | 5715篇 |
2009年 | 5465篇 |
2008年 | 5967篇 |
2007年 | 7254篇 |
2006年 | 7137篇 |
2005年 | 6555篇 |
2004年 | 5302篇 |
2003年 | 5080篇 |
2002年 | 4749篇 |
2001年 | 4620篇 |
2000年 | 4526篇 |
1999年 | 4062篇 |
1998年 | 4009篇 |
1997年 | 3317篇 |
1996年 | 3047篇 |
1995年 | 3404篇 |
1994年 | 3132篇 |
1993年 | 2454篇 |
1992年 | 2102篇 |
1991年 | 1976篇 |
1990年 | 1637篇 |
1989年 | 1357篇 |
1988年 | 1362篇 |
1987年 | 1296篇 |
1985年 | 5744篇 |
1984年 | 7582篇 |
1983年 | 6028篇 |
1982年 | 6479篇 |
1981年 | 5853篇 |
1980年 | 5022篇 |
1979年 | 5078篇 |
1978年 | 4176篇 |
1977年 | 3106篇 |
1976年 | 3591篇 |
1975年 | 2770篇 |
1974年 | 2546篇 |
1973年 | 2251篇 |
排序方式: 共有10000条查询结果,搜索用时 9 毫秒
101.
102.
Y. Kajiya M. Nakajo N. Ichinari Y. Kajiya K. Yamazumi T. Otuji T. Tanaka 《Abdominal imaging》1997,22(1):111-113
A foregut cyst is formed as a result of abnormal budding and pinching of the tracheobronchial tree when bronchial buds develop
to form the primitive respiratory tree. Foregut cysts are clinically classified as bronchogenic, esophageal, enterogastric,
or ciliated hepatic. We present a foregut cyst that occurred in the retroperitoneum and was difficult to distinguish from
other retroperitoneal cystic mass lesions. Magnetic resonance imaging was useful in revealing the cyst's continuity to adjacent
organs.
Received: 19 June 1995/Accepted: 23 July 1995 相似文献
103.
原发性胸腰椎管内肿瘤延误诊治原因探讨(附44例报告) 总被引:2,自引:0,他引:2
本文报告一组44例原发性椎管内肿瘤初期延误诊治,其中10例为腰椎间盘突出而手术,2例为腰椎管狭窄症手术治疗。原发性椎管内肿瘤与脊柱退变性疾病分属两种不同的疾病范畴。为提高诊断和治疗效果,本文就误诊原因作以下讨论。 相似文献
104.
非瓣膜病房颤患者左心耳血流动力学的TEE研究 总被引:1,自引:0,他引:1
应用多平面经食管超声心动图技术(M-TEE),对30例健康人和30例非瓣病房颤患者(NVAF)心底短轴切面测量了左心耳最大直径,同一心动周期内左心耳最大及最小面积及左心耳最大空速度,产将NVAF患者按照自发显影及血栓的有无分为2组。发现NVAF组左心耳增大,收缩力及血流速度均减低,且这种变化在有血栓和有血栓形成倾向的患者中更为明显。 相似文献
105.
本组12例骨肉瘤均采用动脉区域灌注灭活再植及术后化疗方法,术后2年存活率平均为75%,1例因经验不足致局部复发,仅占8.3%,表明在化疗保障下,采用此种方法即能保肢,又能获得与截肢治疗相同的手术效果,优于单纯行灭活再植术后中方法。 相似文献
106.
G. I. C. Ingram M.D 《Haemophilia》1995,1(4):277-282
107.
Kim C. Donaghue M.M. Pena A.T.W. Fung M. Bonney N.J. Howard M. Silink J. Schwingshandl 《Diabetic medicine》1995,12(10):868-873
The study aimed to compare the longitudinal assessment of autonomic nerve function by computerized infrared pupillometry and standard cardiovascular tests in adolescents with diabetes. Adolescents (n = 150) were assessed at two time points (T1 and T2). The median time interval between assessments was 1.5 (range 0.9–3) years. At T1 the median age was 14.5 (range 8.3–19.5) years and the median duration was 6.5 (range 1.1–16) years. The pupillary variables assessed included the resting pupil diameter, the maximum constriction velocity, and the reflex amplitude of constriction. Heart rate reflexes were assessed in response to deep breathing, the Valsalva manoeuvre, and on standing from a lying position (30/15 ratio). Between visits there was a significant decrease in maximum constriction velocity (6.0 mm s?1 vs 6.3 mm s?1, p = 0.0001) and resting pupil diameter (6.2 mm vs 6.3 mm, p = 0.001). At reassessment pupillary abnormalities increased from 32 (21 %) to 45 (30%), with 17 (54 %) of the initial abnormalities persisting. Adolescents with abnormally slow maximum constriction velocity compared to those with normal maximum constriction velocity had a higher glycated haemoglobin (HbA1c%) at T2 (p = 0.02) and between assessments (p = 0.01). Cardiovascular test abnormalities did not increase between visits and the persistence of initial abnormalities was low (21 %). In summary, pupillometry appears a more sensitive test of autonomic nerve dysfunction in adolescents with diabetes than assessment of cardiovascular reflexes. 相似文献
108.
Susumu Kusunoki Atsuro Chiba Seiji Hitoshi Hajime Takizawa Ichiro Kanazawa 《Muscle & nerve》1995,18(4):409-413
Four of 82 patients with Guillain-Barré syndrome (GBS) and 1 of 12 with multifocal motor neuropathy (MMN), who previously had had Mycoplasma pneumoniae infections, had serum antibody to galactocerebroside (Gal-C). Two patients with GBS without mycoplasma infection also had anti-Gal-C antibody, whereas none of the normal or the disease controls had it. As Gal-C is a major glycolipid antigen in myelin, anti-Gal-C antibody may function in the pathogenesis of autoimmune demyelinative neuropathies. Mycoplasma pneumoniae appears to be an important preceding infectious agent in autoimmune neuropathies with anti-Gal-C antibody. © 1995 John Wiley & Sons, Inc. 相似文献
109.
陈爱华 《南方医科大学学报》1990,(3)
本文用X线电影摄影方法评价了49例左室舒张(充盈)功能的影响因素。冠心病(CAD)组23例,高血压病组12例,正常对照组14例。左室充盈功能或顺应性主要受冠脉病变严重程度的影响。冠脉狭窄程度越重,并有陈旧性心肌梗塞、室壁运动异常、EF下降,则充盈功能受损愈明显。血压、年龄因素对舒张充盈功能的影响较小。在CAD组中,心率与1/3充盈分数呈负相关,与正常化高峰充盈率(NPFR)不相关,而EF则与NPFR相关良好。 相似文献
110.
S. Sunano T. Shimada K. Moriyama K. Shimamura 《Clinical and experimental pharmacology & physiology》1990,17(6):413-425
1. The time courses of the relaxation, induced by removal of extracellular Ca2+, of K-depolarized mesenteric artery preparations from stroke prone spontaneously hypertensive rats (SHRSP) and Wistar-Kyoto rats (WKY) were compared. 2. The time course of the decline in extracellular Ca2+ was estimated from the time course of the relaxation and the concentration-response curve of K(+)-depolarized preparations to Ca2+. The time course of the decline in the intracellular free Ca2+ concentration was also estimated from the reported relation between Ca2+ concentration and the contraction of skinned vascular smooth muscle. 3. The time course of relaxation was exponential, the curve being made up of three components. The time course was slower in preparations from SHRSP, especially the first component of the relaxation curve. 4. The time courses of the decline in the intracellular and extracellular Ca2+ concentrations were also exponential, being made up of three components and were also slower in the preparation made from SHRSP. 5. The wall and muscle layer of the mesenteric arteries used in the present experiments were significantly thicker in the SHRSP preparations. 6. Calculation of the half relaxation time, based on the diffusion of Ca2+ across the blood vessel wall, suggested that the slower relaxation in preparations from SHRSP is due largely to the thicker muscle layer, although differences in Ca2+ sequestration by the smooth muscle cells may also be involved. 相似文献