全文获取类型
收费全文 | 73585篇 |
免费 | 6755篇 |
国内免费 | 2851篇 |
专业分类
耳鼻咽喉 | 170篇 |
儿科学 | 619篇 |
妇产科学 | 380篇 |
基础医学 | 3861篇 |
口腔科学 | 725篇 |
临床医学 | 5920篇 |
内科学 | 8048篇 |
皮肤病学 | 1134篇 |
神经病学 | 3501篇 |
特种医学 | 747篇 |
外国民族医学 | 7篇 |
外科学 | 2808篇 |
综合类 | 8925篇 |
现状与发展 | 6篇 |
一般理论 | 3篇 |
预防医学 | 4037篇 |
眼科学 | 699篇 |
药学 | 33925篇 |
29篇 | |
中国医学 | 3810篇 |
肿瘤学 | 3837篇 |
出版年
2024年 | 245篇 |
2023年 | 1141篇 |
2022年 | 1838篇 |
2021年 | 2564篇 |
2020年 | 2514篇 |
2019年 | 2532篇 |
2018年 | 2586篇 |
2017年 | 2818篇 |
2016年 | 2676篇 |
2015年 | 2695篇 |
2014年 | 4614篇 |
2013年 | 7810篇 |
2012年 | 4708篇 |
2011年 | 4855篇 |
2010年 | 3861篇 |
2009年 | 3526篇 |
2008年 | 3329篇 |
2007年 | 3331篇 |
2006年 | 2926篇 |
2005年 | 2663篇 |
2004年 | 2254篇 |
2003年 | 2082篇 |
2002年 | 1612篇 |
2001年 | 1541篇 |
2000年 | 1247篇 |
1999年 | 1074篇 |
1998年 | 988篇 |
1997年 | 957篇 |
1996年 | 797篇 |
1995年 | 751篇 |
1994年 | 666篇 |
1993年 | 574篇 |
1992年 | 634篇 |
1991年 | 539篇 |
1990年 | 477篇 |
1989年 | 406篇 |
1988年 | 389篇 |
1987年 | 366篇 |
1986年 | 330篇 |
1985年 | 358篇 |
1984年 | 321篇 |
1983年 | 250篇 |
1982年 | 261篇 |
1981年 | 229篇 |
1980年 | 161篇 |
1979年 | 138篇 |
1978年 | 138篇 |
1977年 | 96篇 |
1976年 | 98篇 |
1975年 | 75篇 |
排序方式: 共有10000条查询结果,搜索用时 78 毫秒
41.
R. Sandell 《Acta psychiatrica Scandinavica》1994,89(6):433-440
A community-based case-finding sample of 1824 narcotic abusers in Stockholm County was used to standardize a set of rating scales in order to reflect levels of personality organization (PO), in the spirit of Kernberg's theory. PO is assumed to be a function of the ego's capacity to endure inner and outer stress, which manifests itself in the frequency and depth of regressions and the rate of recovery from them. The principles of a method, Rating Ego Balance, for charting the person's characteristic pattern of regression are presented, and its psychometric properties are described on the basis of item response theory. The scales have satisfactory reliabilities and maximal discrimination at subneurotic levels of PO. They show strong construct validity in relation to Kernberg's theory. 相似文献
42.
We reported a case of photoleukomelanodermatitis (Kobori) type drug eruption due to afloqualone (Arofuto®). The patient was given afloqualone and imipramine hydrochloride (Chrytemin®) for cervical spondylosis from November of 1990. Edematous erythema with slight itching appeared on the sun-exposed areas in December of 1990. As drug eruption was suspected, drugs were ceased, and the cutaneous lesions almost disappeared but pigmentations and depigmentations developed in spots in sun-exposed areas in March of 1991. Photopatch and oral challenge tests were positive. 相似文献
43.
Summary: Some of the properties of 4–bromobenzalde-hyde semicarbazone (compound IV), a prototype molecule of a new class of anticonvulsants, aryl semicarbazones, are described. Compound IV demonstrated activity in the maximal electroshock (MES) and subcutaneous pentylenetetrazol (scPTZ) tests in mice, with low neurotoxicity. When given orally to rats, it displayed high potency in the MES test and very low neurotoxicity, resulting in a high protective index (PI). Compound IV displayed no proconvulsant properties, and development of rapid tolerance was not noted. When administered intraperitoneally (i.p.) at doses of 100, 300, or 600 mg/kg to rats, compound IV had no effect on levels of γ-aminobu-tyric acid (GABA) or on GABA-T activity in whole brain. When tested in vitro, compound IV had no effect on rat brain GABA-T at a drug concentration of 100 μM. Although the activities of certain drug-metabolizing enzymes were increased after oral administration of compound IV to rats, these effects were less prominent than those of phenytoin (PHT) and carbamazepine (CBZ). The principal mode of action of compound IV does not appear to be an interaction with the GABAA receptor complex, and other mechanisms, involving excitatory amino acid neurotransmission, will have to be considered in future investigations of the anticonvulsant activity of this compound. 相似文献
44.
米非司酮作用于兔输卵管收缩活动与Ca^2+关系的研究 总被引:1,自引:0,他引:1
通过“结合化学分离与原子吸收分光光度法”对Ca^2 含量测定和离体输卵管肌条收缩记录方法,研究米非司酮(Ru486)对增加假孕(4d)兔输卵管平滑肌收缩频率,而不改变其收缩张力和振幅时与Ca^2 之间的关系,结果提示:(1)Ru486对输卵管分泌液和组织内Ca^2 的含量分布无明显影响;(2)Ru486具有降低细胞外液高Ca^2 浓度促Ca^2 内流,而使收缩增强的效应,且能协同Ca^2 通道阻断剂(Verapamil)抑制细胞外Ca^2 内流,而致收缩减弱的效应。 相似文献
45.
Pharmaceutical Research - 相似文献
46.
B. N. Purdue G. C. A. Fernando A. Busuttil 《International journal of legal medicine》1991,104(5):289-291
Summary An incident is reported in which 2 intravenous drug abusers died as the result of uncontrolled experimentation with intravenous injection of the common anti-hypertensive and anti-anginal drug Nifedipine (Adalatt.m. Bayer), probably in mistake for the commonly abused short-acting benzodiazepine drug Temazepam. Large quantities of Nifedipine were identified in the blood of both deceased men by gas chromatography. Apart from intense gastric mucosal congestion, pulmonary oedema and general visceral congestion, the autopsy findings were entirely nonspecific. The similarity in colour, shape and texture between capsules of Nifedipine and those of Temazepam is likely to have prompted the mistake. 相似文献
47.
药物不良反应国内文献题录检索系统 总被引:2,自引:0,他引:2
本文报道了药物不良反应国内文献题录检索系统的设计原理、功能特点,以输入药名及不良反应类别为例,显示了检索系统操作简便,提供信息及时准确的特点。本系统可从药名、不良反应类别及作者等多方面进行检索,可为查询者提供所需的详细资料,弥补了人工查阅文献的不足。并将继续扩大文献资料库,由题录向电报文体文摘形式转化,以贮存更多的信息。 相似文献
48.
L. A. Cassis L. P. Dwoskin 《Journal of neural transmission (Vienna, Austria : 1996)》1994,98(2):159-164
Summary To determine if acute or chronic (21 days) losartan (10mg/kg, s.c.) regulates the renin-angiotensin system in interscapular brown adipose tissue, angiotensin II (AII) content and [3H]overflow from slices preloaded with [3H]norepinephrine were examined. Acute or chronic losartan administration had no effect on AII content. AII increased evoked [3H]overflow from slices from control rats. Losartan administration did not alter basal [3H]outflow or evoked [3H]overflow. Acute losartan administration inhibited AII-induced enhancement of evoked [3H]overflow. Tolerance developed to the inhibitory effect of losartan following chronic administration.Supported by a grant from the American Heart Association (Local Kentucky Affiliate) and by a gift from DuPont Merck Pharmaceuticals. Portions of this work have been presented in abstract form [The Pharmacologist 34(3): 157, 1992] 相似文献
49.
P. H. Mogensen L. Jórgensen J. Boas M. Dam A. Vesterager G. Flesch P. K. Jensen 《Acta neurologica Scandinavica》1992,85(1):14-17
The effects of dextropropoxyphene on the steady-state kinetics of oxcarbazepine and its metabolites were investigated in eight patients with epilepsy or trigeminal neuralgia. One patient dropped out of the study, presumably due to side-effects of dextropropoxyphene. Dextropropoxyphene did not affect the plasma levels of the principal active metabolite, 10,11-dihydro-10-hydroxy-carbamazepine. Since dextropropoxyphene is known to increase the plasma levels of carbamazepine, leading to toxicity, the findings of this study suggest that oxcarbazepine is a useful alternative to carbamazepine when concomitant dextropropoxyphene therapy is required. 相似文献
50.
随着医药工业的发展,新药层出不穷。以抗生素为例,20世纪50年代临床用的抗生素只有青、链、红、氯四大素,现在常用临床的抗生素以有100多种,临床医生长期来忙与医疗任务,如何掌握新药信息,做到合理选药,合理用药,使药物的药理作用转化为治疗效应,已成为临床医生日益关心的问题。1抗生素在临床应用中存在问题1.1常规固定方案长期以来根据以往的经验或资料,正式或非正式采用抗生素治疗方案。如:氨苄西林+庆大霉素、青霉素+庆大霉素、红霉素+氯霉素。由于对致病菌针对性不强,以致延误治疗。1.2抗生素在选择中存在问题随着医药工业的发展,抗生素… 相似文献