全文获取类型
收费全文 | 2015篇 |
免费 | 96篇 |
国内免费 | 12篇 |
专业分类
耳鼻咽喉 | 7篇 |
儿科学 | 137篇 |
妇产科学 | 64篇 |
基础医学 | 255篇 |
口腔科学 | 50篇 |
临床医学 | 148篇 |
内科学 | 329篇 |
皮肤病学 | 63篇 |
神经病学 | 153篇 |
特种医学 | 99篇 |
外科学 | 147篇 |
综合类 | 75篇 |
预防医学 | 154篇 |
眼科学 | 121篇 |
药学 | 205篇 |
中国医学 | 10篇 |
肿瘤学 | 106篇 |
出版年
2023年 | 12篇 |
2022年 | 57篇 |
2021年 | 80篇 |
2020年 | 41篇 |
2019年 | 52篇 |
2018年 | 72篇 |
2017年 | 49篇 |
2016年 | 64篇 |
2015年 | 53篇 |
2014年 | 72篇 |
2013年 | 102篇 |
2012年 | 114篇 |
2011年 | 132篇 |
2010年 | 79篇 |
2009年 | 75篇 |
2008年 | 84篇 |
2007年 | 78篇 |
2006年 | 95篇 |
2005年 | 88篇 |
2004年 | 87篇 |
2003年 | 72篇 |
2002年 | 51篇 |
2001年 | 42篇 |
2000年 | 39篇 |
1999年 | 17篇 |
1998年 | 38篇 |
1997年 | 30篇 |
1996年 | 32篇 |
1995年 | 30篇 |
1994年 | 21篇 |
1993年 | 13篇 |
1992年 | 18篇 |
1991年 | 19篇 |
1990年 | 19篇 |
1989年 | 28篇 |
1988年 | 25篇 |
1987年 | 18篇 |
1986年 | 17篇 |
1985年 | 15篇 |
1984年 | 13篇 |
1983年 | 13篇 |
1982年 | 6篇 |
1981年 | 7篇 |
1980年 | 10篇 |
1979年 | 9篇 |
1978年 | 4篇 |
1977年 | 9篇 |
1976年 | 6篇 |
1972年 | 3篇 |
1971年 | 3篇 |
排序方式: 共有2123条查询结果,搜索用时 15 毫秒
1.
2.
Veena Kumari Jeffrey A. Gray Philip J. Corr Owen F. Mulligan Paul A. Cotter Stuart A. Checkley 《Psychopharmacology》1997,129(3):271-276
The effects of an indirect dopamine-agonist, d-amphetamine, and a non-selective dopamine receptor antagonist, haloperidol, were investigated in normal male volunteers using
a between-subjects double-blind design in a procedural learning task, thought mainly to involve unconscious/automatic learning.
The results showed: (1) d-amphetamine facilitated response speed, whereas haloperidol inhibited it, in comparison to placebo; (2) the linear increase
in procedural learning corresponded with pharmacological manipulation of degree of dopaminergic activity, i.e. subjects given
haloperidol showed the least, and subjects given d-amphetamine the greatest, procedural learning. The implications of these findings are discussed in relation to investigation
of abnormalities of procedural learning processes in schizophrenia.
Received: 28 June 1996/Final version: 2 October 1996 相似文献
3.
C P Baveja D Chattopadhya S Kumari K K Dutta S Sehgal 《The Journal of communicable diseases》1989,21(1):59-61
Sixty drinking water samples collected from various sources in different areas of Delhi during epidemic of cholera and gastroenteritis were analysed for bacteriological standards. Only 27 (45 per cent) samples were found to be satisfactory for human consumption. Remaining thirty-three (55 per cent) samples showed presence of coliform organisms with MPN value ranging from 10 to 1800+ per 100 ml. Among these positive samples, 31 (93.9 per cent) samples contained faecal coli. Twenty out of thirty (66.6 per cent) Hand pump, 9 out of 21 (42.8 per cent) Taps 2 out of 4 (50 per cent) Tube well and 2 out of 5 (40 per cent) of miscellaneous sources showed contamination with coliform organisms. 相似文献
4.
5.
6.
Atul K Madan Constantine T Frantzides Christopher L Tebbit William C Park Nakka V Aruna Kumari Nina Shervin 《JSLS, Journal of the Society of Laparoendoscopic Surgeons》2004,8(2):191-193
BACKGROUND: Laparoscopic suturing and tying constitute advanced minimally invasive surgery skills. Developing proficiency in the standard methods with needle drivers is often an arduous process. Recent advances in laparoscopic instrumentations has allowed for easier methods of suturing and tying. This study investigated the hypothesis that the use of a specialized suturing device and a specialized tying device allows inexperienced medical students to suture and tie laparoscopically. METHODS: Preclinical medical students who had not received any training in open or laparoscopic surgery were included in this investigation. Each student was given a 5-minute demonstration of a specialized suturing device and a specialized tying device. The medical students were not allowed to deploy either device before actual use. After the demonstration, each student was given the device to use in a porcine model. Times were recorded and a subjective grade was given for each student. RESULTS: Twenty medical students were involved in this study. All medical students were able to complete the task of suturing and tying. The average time to suture was 104.6 seconds and the average time to tying was 31.2 seconds. The average subjective performance grade was 90 (out of 100). CONCLUSION: Specialized devices are easy to learn and use for laparoscopic suturing and tying with minimal instruction even for inexperienced medical students. Even surgeons who are not well versed in laparoscopic surgery should be able to suture and tie with certain laparoscopic instruments. 相似文献
7.
The first 150 words of the full text of this article appear below. Key points Coronary artery disease accounts for >30% ofdeaths in Western society. The diagnosis of myocardial infarctionshould be qualified by size, causation and time from occurrence. Mortalityis reduced by immediate or primary percutaneouscoronary intervention or thrombolysis within the first 24 hof onset of ST-segment elevation myocardial infarction. Strategiesto reduce platelet activation (glycoprotein IIb/IIIa receptorantagonists, or clopidogrel) are now recommended in the treatmentof high-risk non-ST-segment myocardial infarction/unstable angina. Elevatedserum troponins may be the result of non-ischaemic myocardialdamage, especially in critical illness.
Pathophysiology
Changes in the definition of terms relating to the diagnosisof myocardial infarction (MI) have evolved by better understandingof the pathophysiology culminating in the new term of acutecoronary syndrome (ACS). Figure 1 illustrates the processesthat occur in the development of an acute coronary event. 相似文献
8.
9.
Detection of fetal hydronephrosis in utero, subsequent investigation, and surgical treatment is described. With the increasing use of ultrasound for obstetrical problems and greater experience with fetal sonography, more urologic abnormalities will be diagnosed prenatally. 相似文献
10.
Khaidem Ibochouba Singh Jigme Tenzing Shartsho Waikhom Ruhini Kumar Singh Raj Kumari Tamphasana Devi Ahongshangbam Meina Singh 《Indian journal of hematology & blood transfusion》2007,23(3-4):116-118
Two children out of three siblings of a family presented with tiredness, fatigue, and breathlessness for more than 6 months. Examination of peripheral blood smear, bone marrow aspirate, and a positive acidified serum test (HEMPAS) revealed these children to be a case of congenital dyserythropoietic anemia type II. This case is reported because of its rarity. 相似文献