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   70082篇
  免费   4573篇
  国内免费   1160篇
耳鼻咽喉   455篇
儿科学   1468篇
妇产科学   704篇
基础医学   3634篇
口腔科学   1122篇
临床医学   7424篇
内科学   6534篇
皮肤病学   928篇
神经病学   3798篇
特种医学   1478篇
外国民族医学   5篇
外科学   4404篇
综合类   14004篇
现状与发展   3篇
一般理论   4篇
预防医学   6979篇
眼科学   609篇
药学   12618篇
  179篇
中国医学   6045篇
肿瘤学   3420篇
  2024年   174篇
  2023年   1071篇
  2022年   2122篇
  2021年   2815篇
  2020年   2800篇
  2019年   2381篇
  2018年   2222篇
  2017年   2532篇
  2016年   2888篇
  2015年   2785篇
  2014年   7021篇
  2013年   6711篇
  2012年   5762篇
  2011年   5477篇
  2010年   4059篇
  2009年   3118篇
  2008年   2879篇
  2007年   2679篇
  2006年   2211篇
  2005年   1737篇
  2004年   1388篇
  2003年   1213篇
  2002年   938篇
  2001年   793篇
  2000年   708篇
  1999年   545篇
  1998年   498篇
  1997年   457篇
  1996年   374篇
  1995年   335篇
  1994年   332篇
  1993年   282篇
  1992年   265篇
  1991年   260篇
  1990年   235篇
  1989年   234篇
  1988年   222篇
  1987年   227篇
  1986年   211篇
  1985年   320篇
  1984年   406篇
  1983年   294篇
  1982年   353篇
  1981年   274篇
  1980年   249篇
  1979年   240篇
  1978年   165篇
  1977年   133篇
  1976年   132篇
  1975年   106篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
131.
中西医结合治疗缺血性脑血管病临床疗效观察   总被引:1,自引:0,他引:1  
目的 回顾性分析中西医结合治疗缺血性脑血管病的疗效。方法 对126例缺血性脑血管病患者,在早期西医溶栓、抗凝、降低血液粘度、扩张血管和促进脑细胞代谢等治疗基础上,结合中医辩证施治治疗。结果 42例瘫肢肌力恢复达V级;48例肌力≥Ⅳ级,言语流畅;27例生活能基本自理,可依杖散步,肌力≥Ⅲ级:9例与治疗前对比肌力提高Ⅰ~Ⅱ级,但生活仍不能自理。结论 在西药治疗基础上,结合益气活血中药调理可显著提高患者的疗效。  相似文献   
132.
中国原发性肝癌临床分期预测肝癌肝移植预后的临床研究   总被引:2,自引:0,他引:2  
目的评价“中国原发性肝癌临床分期”对肝癌肝移植疗效的预测价值。方法对1993年4月至2003年1月我科59例采用肝移植治疗的肝癌病人临床资料进行回顾性分析,按中国原发性肝癌临床分期原则进行分期,比较各期间肝癌肝移植疗效。结果Ⅰb、Ⅱa、Ⅱb、Ⅲa和Ⅲb期移植术后1年生存率分别为83·33%、66·67%、50·00%、35·71%和16·67%,各期间术后累计生存率有统计学差异(P<0·01);Ⅰb~Ⅱb和Ⅲa~Ⅲb期移植术后1年生存率分别为66·67%和25·00%,2年生存率分别为45·71%和25·00%,两组间术后累计生存率有统计学差异(P<0·05)。结论中国原发性肝癌临床分期适用于肝癌肝移植术前分期。  相似文献   
133.
目的评价不同治疗方法对慢性牙周炎的临床效果。方法对90例慢性牙周炎患者,随机分成三组:龈上洁治术 抗生素组(A组),单纯龈上洁治术组(B组)和单纯抗生素组(C组)。分别给予不同的治疗,在治疗后1周、2周和4周记录牙周袋探诊深度(PPD)、探诊附着水平(PAL)、菌斑指数(PLI)、龈沟出血指数(SBI)。结果治疗1周和2周后各指标显著减轻(P<0.05),2周比1周减轻更明显(P<0.05),4周与2周比较无明显差异(P>0.05),A组各指标减轻比B组显著(P<0.05);B组比C组疗效显著(P<0.05)。结论A组作用优于B组(P<0.05),B组优于C组(P<0.05)。  相似文献   
134.
目的探讨闭合性脑外伤患者恢复后期的记忆障碍特点。方法用临床记忆量表对 2 0例闭合性脑外伤患者恢复后期及 2 0例正常人进行记忆测验。结果闭合性脑外伤患者恢复后期 5项分测验及记忆商均明显低于正常人对照组 ,MQ≤ 79的比例较正常人明显增高。结论闭合性脑外伤患者恢复后期有非常严重的记忆障碍 ,其回忆比再认受损更严重  相似文献   
135.
【目的】探讨股骨干骨折扩髓与不扩髓髓内钉固定对凝血机能和肺换气功能的影响。【方法】 38例股骨干骨折分别采用扩髓 (RFN)和不扩髓 (UFN)髓内钉固定 ,在手术开始前至术后 4 8h内 7个不同时间段监测血小板、纤维蛋白原、凝血酶原时间 (PT)和部分凝血活酶激活时间 (APTT)的变化 ,并动脉血气分析 ,计算肺泡 动脉血氧分压递差 [P(A aDO2 ) ]。【结果】RFN组 ,扩髓后血小板开始减少 ,P(A aDO2 )升高 (P<0 0 5 ) ;髓钉插入后 30min纤维蛋白原减少 ,PT、APTT延长 (P <0 0 5 ) ;UFN组表现出同样的趋势 ;两组中各项指标均在 2 4~ 4 8h内恢复正常 ;动脉血气分析各时间段和组间差异无显著性 (P >0 0 5 )。【结论】扩大髓腔的髓内钉固定 ,和不扩髓相比 ,并不影响肺换气功能 ,对凝血机能的影响是一个自限过程 ,单纯股骨干骨折 ,可耐受扩髓固定手术。  相似文献   
136.
Chronic nasal obstruction in children is a very common disorder. Obstructing adenoid is usually the first to blame. Though the clinical assessment is essential, it is often considered unreliable or insufficient. We conducted a prospective clinical study to validate a clinical score predicting the severity of adenoid obstruction in symptomatic children. The clinical score (CS) included mouth breathing, snoring, restless sleep, frequent waking-up at night and obstructive breathing during sleep. Each item received a score of 0 or 1. The palatal airway was evaluated on a lateral nasopharyngeal x-ray. The degree of obstruction was assessed intra-operatively by a laryngeal mirror using a 3-grade scale. The volume of each adenoid specimen was measured. Eighty-six patients were enrolled, 51 boys and 35 girls, aged 13–181 months (mean 52, median 45). The CS correlated very well with the intra-operative findings (p < 0.01) and with the degree of palatal airway obstruction (p < 0.05) but not with the volume of the adenoid removed (p > 0.05). The CS was higher in children younger than 3 years (CS > 3 in 85.7% vs. 29.2%), having more frequent obstructive breathing during sleep (71.43% vs. 21.54%). A CS of three or higher, predicted severe obstruction in 96.5% of patients, as detected intra-operatively. The suggested CS is simple to use and is highly reliable in identifying children in need for adenoidectomy, in the context of normal anterior rhinoscopy and tonsils less than grade three.This work was presented at the podium of the XVIII IFOS in Rome, Italy on June 26, 2005.  相似文献   
137.
The discriminative stimulus (DS) and subjective effects of d-amphetamine (AMP), phenmetrazine (PMT) and fenfluramine (FFL) were studied in a group of normal healthy adults. Subjects (N=27) were trained to discriminate between placebo and 10 mg AMP (PO). Fourteen of the subjects (discriminators) reliably learned the discrimination, whereas the other 13 did not. Nearly all discriminators labelled AMP as a stimulant, and AMP, relative to placebo, increased ratings of drug liking and general activity level, and produced typical stimulant-like subjective effects, as measured by the Profile of Mood States, the Addiction Research Center Inventory, and a series of visual analog scales. The discrimination accuracy of discriminators increased as a function of hour after drug ingestion, as did analog ratings of how certain subjects were that their discrimination responses were correct. Discriminators were tested with doses of PMT (25 and 50 mg) and FFL (20 and 40 mg) to determine whether the DS properties of these drugs would substitute for those of AMP. Both doses of PMT consistently substituted for AMP, and PMT produced subjective effects very similar to those of AMP. Conversely, neither dose of FFL consistently substituted for AMP, and FFL produced essentially no subjective effects. These findings are consistent with results from discrimination studies with other species, and provide further evidence of the validity of this procedure for studying the DS properties of drugs in humans. Offprint requests to: L.D. Chait  相似文献   
138.
Radiation-induced bone tumors in beagle dogs exposed to 90Sr have been evaluated in terms of their incidence, time of appearance, occurrence as multiple tumors, anatomic distribution, and the influence of sex on their development. Among dogs fed 90Sr during skeletal development, the incidence of bone tumors was dose dependent. Tumors thus appeared in 10 of 19 dogs receiving average skeletal doses of 130 Gy, 15 of 60 receiving 97 Gy, 5 of 61 receiving 61 Gy, 2 of 65 receiving 26 Gy, and 1 of 40 receiving 1.3 Gy. No tumors appeared among 66 dogs who received 8 Gy, 78 who received 0.3 Gy, and 80 non-irradiated controls, all of which have been observed for life. Among dogs given a single intravenous injection of 90Sr in early adulthood, tumor production was somewhat higher than among 90Sr-fed dogs at the same radiation dose: bone tumors were present in 6 of 25 dogs who received 62 Gy and 1 of 20 dogs who received 7.5 Gy. Bone tumors appeared sooner and were more often multiple in animals receiving the higher doses. Long bones were the sites of most of the tumors appearing after the highest dose level. Bones of the head, particularly the mandible, were the predominant site of tumors in the next highest dose level group.  相似文献   
139.
目的探讨心力衰竭并发心律失常的发病规律及治疗方法。方法回顾性分析了93例慢性心力衰竭病人的临床资料,包括临床特点、诊断治疗方法以及预后。结果心律失常发生率为60.2%,以室性早搏发生率最高32.1%,其次是房性早搏26.8%,心房纤颤21.4%,其他19.7%,经治疗有效71例,总有效率76.3%。结论纠正心功能不全是治疗的关键,应根据具体情况选择性地应用抗心律失常药。  相似文献   
140.
果酸疗法在痤疮治疗中的应用   总被引:8,自引:4,他引:4  
目的:评价果酸(羟基乙酸)治疗痤疮的临床疗效和安全性,掌握果酸治疗的适应证及方法。方法:应用浓度为20%、35%、50%、70%的羟基乙酸治疗24例痤疮患者,采用自身前后对照进行疗效观察。结果:23例患者完成治疗。4周后皮损减退率34%,有效率83%;8周后12例患者皮损减退率53%,有效率100%;12周后5例患者皮损减退率69%,有效率100%;炎性皮损减退率高于非炎性皮损。结论:果酸治疗痤疮至少需要4周,且安全有效。  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