全文获取类型
收费全文 | 44422篇 |
免费 | 3977篇 |
国内免费 | 3012篇 |
专业分类
耳鼻咽喉 | 208篇 |
儿科学 | 551篇 |
妇产科学 | 570篇 |
基础医学 | 5221篇 |
口腔科学 | 769篇 |
临床医学 | 5645篇 |
内科学 | 6795篇 |
皮肤病学 | 398篇 |
神经病学 | 2424篇 |
特种医学 | 1518篇 |
外国民族医学 | 23篇 |
外科学 | 4775篇 |
综合类 | 7307篇 |
现状与发展 | 12篇 |
一般理论 | 3篇 |
预防医学 | 3019篇 |
眼科学 | 1028篇 |
药学 | 4552篇 |
17篇 | |
中国医学 | 2354篇 |
肿瘤学 | 4222篇 |
出版年
2024年 | 108篇 |
2023年 | 593篇 |
2022年 | 1400篇 |
2021年 | 1789篇 |
2020年 | 1455篇 |
2019年 | 1270篇 |
2018年 | 1345篇 |
2017年 | 1295篇 |
2016年 | 1231篇 |
2015年 | 1953篇 |
2014年 | 2325篇 |
2013年 | 2187篇 |
2012年 | 3488篇 |
2011年 | 3720篇 |
2010年 | 2426篇 |
2009年 | 2063篇 |
2008年 | 2698篇 |
2007年 | 2643篇 |
2006年 | 2377篇 |
2005年 | 2391篇 |
2004年 | 1574篇 |
2003年 | 1419篇 |
2002年 | 1147篇 |
2001年 | 932篇 |
2000年 | 1061篇 |
1999年 | 1077篇 |
1998年 | 641篇 |
1997年 | 693篇 |
1996年 | 510篇 |
1995年 | 485篇 |
1994年 | 445篇 |
1993年 | 303篇 |
1992年 | 315篇 |
1991年 | 326篇 |
1990年 | 292篇 |
1989年 | 250篇 |
1988年 | 219篇 |
1987年 | 212篇 |
1986年 | 181篇 |
1985年 | 136篇 |
1984年 | 100篇 |
1983年 | 78篇 |
1982年 | 32篇 |
1981年 | 43篇 |
1980年 | 28篇 |
1979年 | 32篇 |
1978年 | 25篇 |
1977年 | 19篇 |
1976年 | 18篇 |
1973年 | 10篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
1996年—1997年8月,对13例新生儿脐炎在应用抗生素治疗的基础上,采用诺氟沙星涂脐取得满意疗效,现报告如下:1资料及方法本组13例,男8例,女5例,年龄6d~23d,其中伴有肉芽肿者4例。首先给予局部清创,即用生理盐水将创面清洗干净,若脓性分泌... 相似文献
22.
我们自制了16个不同形状和大小的金属支架模型,置入人造血管腔中,并采用高体正常血管8条(犬腹主动脉4条,人冠状动脉4条)进行经血管腔内超声显像(IVUS)的体元模型三维重建(3DR)研究。结果显示,该技术能真实地再现支架在管腔内的形态、支架与管壁之间的间隙及离体正常血管的管腔及管壁形态,经提取后重建的支架模型与实物非常相似。经3DR测得的支架及血管腔内径与实测值均高度相关(r分别为0.96和0.99,p<0.001)。支架与管壁之间空隙的3DR测值与实测值也高度相关(r=0.97,p<r.0.01)。 相似文献
23.
Jim-Shoung Lai T.-N. Wu Saou-Hsing Liou Chen-Yang Shen Chiam-Fang Guu Kquei-Nu Ko Chi. Hsueh-Yun P.-Y. Chang 《International archives of occupational and environmental health》1997,69(4):295-300
Objective: To examine the relationship between ambient lead levels and blood lead levels and to explore the modifiers of the relationship
between ambient lead and blood lead. Method: A cross-sectional study was conducted in two lead battery factories. Blood lead level and ambient lead concentration were
measured for each participant concurrently. A structured questionnaire was administered to collect sociodemographic characteristics
and occupational history. Design: Biological and personal environmental measurements of 219 lead-exposed workers were analyzed by both simple and multiple linear
regression. A regression model was selected for interpretation. Results: A high correlation (r=0.62) between ambient lead (PbA) and blood lead (PbB) was observed. In addition, numerous factors, including age, sex, alcohol
consumption, personal hygiene practice and type of lead exposure, were also found to influence blood lead levels. Although
PbB was highly correlated with PbA, blood lead level may not be effectively lowered by reducing ambient lead level. Based
on the regression coefficients, improvement of hygienic practice was more effective at lowering PbB than reducing ambient
lead level. Good hygienic practice may be the preferential way to reduce lead exposure in current conditions. Conclusion: Education of correct work practice may be more important than engineering control in the developing countries to lower blood
lead levels in lead battery factories.
Received: 28 May 1996/Accepted: 30 August 1996 相似文献
24.
原发性腹膜后脂肪肉瘤20例报告 总被引:1,自引:0,他引:1
自1965年5月至1991年7月共收治原发性腹膜后脂肪肉瘤20例,均经手术及病理证实。20例中完全切除者15例,部分切除者4例,活检1例。肿瘤切除合并肾,肠襻等邻近器官切除者达12例。全组的5年,10年生存率分别是57.1%和20.0%,完全切除组的5年10年生存率分别是63.6%和28.6%。20例病人共进行了48次切除手术。首次手术死亡2例。着重讨论了本病的诊断、治疗和突出的临床特点。 相似文献
25.
26.
抑郁障碍患者人格特征与发病关系的研究 总被引:7,自引:3,他引:4
目的探讨抑郁障碍患者的人格特征与其疾病发病间的关系。方法采用自评抑郁量表(SDS)、艾森克人格问卷 (EPQ)、应对方式评定量表 (WCRS)和归因方式问卷 (ASQ)对 76名抑郁障碍患者进行测试 ,同时选取 84名健康被试进行对照研究。结果①抑郁组患者在EPQ中神经质 (N)与精神质 (P)的得分显著高于健康组。②WCRS的结果显示在“宣泄接纳”、“退避调节”两个因子上 ,抑郁组的平均得分低于健康组。③在ASQ的得分中 ,抑郁组在负性事件归因的自身性、持久性和整体性均显著高于健康组。④抑郁障碍患者的“神经质”人格特质与应对方式的“宣泄接纳”和“退避调节”因子呈负相关 (r = 0 .474)。结论抑郁障碍患者的人格特征可表现为较强的神经质及孤僻、交往障碍 ,他们这种人格特征及应对和归因方式在其发病过程中起着重要作用。 相似文献
27.
Nan-Fu Chen Yeou-Chih Wang Chiung-Chyi Shen Yee-Jee Jan Wen-Hsien Chen Ching-Hsiang Leu 《Journal of clinical neuroscience》2004,11(5):527-530
We report a case of calcified chronic encapsulated intracerebral haematoma (ICH) in a 29-year-old female who presented with progressive left sided weakness and intermittent seizures since childhood. The preoperative magnetic resonance (MR) imaging of the head initially suggested that a partially thrombosed aneurysm or vascular malformation was present. However, no vascular stain was found on the digital subtraction angiography (DSA) of both the carotid and vertebral arteries. The excised mass was histologically diagnosed as a chronic ICH. We traced the patient's medical history and found that at the age of one she sustained a head injury after a fall. So far, to our knowledge, no case of epilepsy secondary to a calcified chronic encapsulated ICH occurring 28 years after head injury has been reported. Calcified chronic encapsulated ICH concomitant with new bone formation within is even rarer. The possible pathogenesis of this case is discussed. 相似文献
28.
介绍了一种从谷朊粉废水中提取戊聚糖的工艺,由此工艺得到的产品(戊聚糖质量分数约70%,蛋白质质量分数约20%)能较好地保持戊聚糖的特性.研究了其它添加剂(卡拉胶)对戊聚糖的乳化性,戊聚糖对肉制品持油、持水性以及其质构的影响.谷朊粉废弃水提取物与卡拉胶的复配产品在添加量(质量分数)为6%时能使肉制品有较好的持油性和相应的质构. 相似文献
29.
4-Aminopyridine (4-AP) induced an atropine- and tetrodotoxin (TTX)-insensitive contraction (resistant contraction), in a concentration-dependent manner, in the isolated jejunum of rabbits. The failure of specific antagonists of histamine, serotonin and substance P to affect this resistant contraction ruled out the participation of histamine, serotonin and/or substance P. Antiserum against neuropeptide Y (NPY) reduced this resistant contraction in a concentration-dependent manner and inhibited the action of 4-AP totally at a high concentration (1.25% dilution) whereas normal serum lacked this ability. This suggested that the release of NPY was involved in this 4-AP-induced resistant contraction. Radioimmunoassay of NPY-like immunoreactivity in isolated synaptosomal preparations indicated that 4-AP possessed the ability to induce the release of NPY. However, guanethidine did not affect the actions of 4-AP, indicating that NPY is released mainly from non-adrenergic nerves. Our results indicate that 4-AP induces the release of NPY from non-adrenergic nerves to produce an atropine- and TTX-resistant contraction in the isolated jejunum of rabbits. 相似文献
30.