全文获取类型
收费全文 | 21460篇 |
免费 | 1704篇 |
国内免费 | 51篇 |
专业分类
耳鼻咽喉 | 253篇 |
儿科学 | 740篇 |
妇产科学 | 409篇 |
基础医学 | 3807篇 |
口腔科学 | 332篇 |
临床医学 | 1831篇 |
内科学 | 4163篇 |
皮肤病学 | 303篇 |
神经病学 | 2063篇 |
特种医学 | 951篇 |
外国民族医学 | 8篇 |
外科学 | 2229篇 |
综合类 | 74篇 |
一般理论 | 8篇 |
预防医学 | 2308篇 |
眼科学 | 329篇 |
药学 | 1615篇 |
中国医学 | 15篇 |
肿瘤学 | 1777篇 |
出版年
2023年 | 115篇 |
2022年 | 182篇 |
2021年 | 378篇 |
2020年 | 269篇 |
2019年 | 353篇 |
2018年 | 461篇 |
2017年 | 380篇 |
2016年 | 409篇 |
2015年 | 507篇 |
2014年 | 644篇 |
2013年 | 865篇 |
2012年 | 1303篇 |
2011年 | 1311篇 |
2010年 | 619篇 |
2009年 | 709篇 |
2008年 | 1101篇 |
2007年 | 1187篇 |
2006年 | 1135篇 |
2005年 | 1088篇 |
2004年 | 887篇 |
2003年 | 911篇 |
2002年 | 755篇 |
2001年 | 690篇 |
2000年 | 706篇 |
1999年 | 647篇 |
1998年 | 322篇 |
1997年 | 286篇 |
1996年 | 297篇 |
1995年 | 253篇 |
1994年 | 217篇 |
1993年 | 205篇 |
1992年 | 410篇 |
1991年 | 380篇 |
1990年 | 396篇 |
1989年 | 388篇 |
1988年 | 335篇 |
1987年 | 289篇 |
1986年 | 258篇 |
1985年 | 256篇 |
1984年 | 174篇 |
1983年 | 135篇 |
1982年 | 81篇 |
1981年 | 85篇 |
1980年 | 56篇 |
1979年 | 94篇 |
1978年 | 54篇 |
1977年 | 56篇 |
1976年 | 53篇 |
1975年 | 56篇 |
1974年 | 72篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
Hand-assisted laparoscopic splenectomy for hydatid cyst 总被引:1,自引:1,他引:0
K. E. W. Ballaux J. M. Himpens G. Leman M. R. P. Van den Bossche 《Surgical endoscopy》1997,11(9):942-943
Splenic hydatidosis is a rare condition. We performed a hand-assisted laparoscopic splenectomy for a large hydatid cyst localized
in the center of the spleen. We discuss the advantages of the ``helping hand.'
Received: 27 September 1996/Accepted: 19 November 1996 相似文献
72.
Zusammenfassung. Viele Hygienema?nahmen in Operationsabteilungen sind durch wissenschaftliche Untersuchungen nicht belegt. Die in dieser Arbeit
vom Nationalen Referenzzentrum für Krankenhaushygiene, das 1996 vom Bundesgesundheitsministerium eingerichtet wurde, zusammengestellten
Empfehlungen stützen sich auf die Ergebnisse wissenschaftlicher Untersuchungen und trennen so die unbedingt notwendigen von
den weniger bzw. nicht sinnvollen Ma?nahmen.
Summary. Many hygienic procedures performed in operation units are not supported by scientific investigations. The following recommendations by the National Reference Center for Hospital Epidemiology, founded by the German Ministry of Health in 1996, are based on the scientific literature and separate necessary from less necessary and unnecessary procedures.相似文献
73.
Patrick J. Bindels Dieke K. Mulder-Folkerts Kees Boer Maarten F. Schutte Wouter J. van der Velde Frans J. Wong Anneke J. A. R. van den Hoek Gerard J. van Doornum Roel A. Coutinho 《European journal of epidemiology》1994,10(3):331-338
The objective of the study was to monitor the HIV prevalence in the years 1988–1991 among pregnant women in the Amsterdam region, visitors to an abortion clinic and 3 outpatient infertility clinics. All women attending these clinics were asked to participate in the study on a voluntary basis and were tested with informed consent. The women were questioned about risk-bearing behaviour of themselves and their sexual partner(s). In the period 1988–1991, of the 23,827 eligible pregnant women, 22,165 women participated (93.0%). Twenty-seven women were found to be positive for HIV antibodies (0.12%, 95% CI: 0.08%–0.17%), of whom twenty belonged to a known HIV risk group or had a partner who belonged to one of these groups and 7 women had no known HIV risk. Seventeen of the 27 women had a foreign nationality. The annual HIV prevalence among pregnant women was: 1988: 0.28%; 1989: 0.10%; 1990: 0.10%; 1991: 0.11%. In the years 1990 and 1991, of the 1,128 eligible women visiting the abortion clinic 953 (84.5%) were tested. Eleven women were HIV-seropositive (1.15%, 95% CI: 0.6%–2.0%), of whom 9 were from an AIDS endemic region, 1 woman had a partner from this region and 1 woman had no known HIV risk. Four African women had HIV-2 antibodies. At the 3 outpatient infertility clinics 1 woman was found to be HIV-positive (0.13%; 95% CI: 0.02–0.9). She had no other risk than a partner from an AIDS endemic area. In the Amsterdam region there was a steady and low HIV prevalence (0.1%) among pregnant women through the years 1988–1991. The prevalence in the abortion clinic was ten times higher. The program was able to detect possible high risk groups within the population. Migration and travelling can play an important role in the spread of HIV in the general heterosexual population. 相似文献
74.
P van den Broek R J Admiraal J Brokx L Mens T Spies 《Nederlands tijdschrift voor geneeskunde》1992,136(29):1404-1409
Cochlear implants have been applied on a limited scale in the Netherlands since 1985. In a government sponsored health service trial the method was further explored from 1988 to 1991. During this period 20 persons were implanted, ten with a Vienna extracochlear system and ten with a 22-electrode Nucleus intracochlear system. The ages varied from 5 to 62, the duration of deafness from 2 to 47 years. Some patients were congenitally deaf. The major cause of deafness was meningitis. The effect of the implantation was tested with the 'minimal auditory capability' test battery adapted for the Dutch language. 18 persons were wearing their system for more than 8 h a day; one person, a prelingually deaf did no longer use his implant while another one only used it occasionally. Except for two persons, all scored above chance level on several tests. The postlingually deaf persons with the Nucleus system all achieved a certain degree of open set speech understanding without lipreading. With the aim of achieving better selection criteria a new trial has started with the same financial sources in cooperation with the Utrecht University Hospital. 相似文献
75.
T K Al-Hussaini D M Abd el-Aal I B Van den Veyver 《International journal of gynaecology and obstetrics》2003,83(2):179-186
OBJECTIVES: To present a series of women with recurrent molar pregnancies, including rare familial cases, and discuss etiology and treatment options. METHODS: We performed a detailed clinical evaluation and pedigree analysis of five Egyptian women with recurrent pregnancy loss due to molar pregnancy. RESULTS: The women had a history of four to nine consecutive hydatidiform moles but of no viable pregnancies. Two of the women had molar pregnancies with different husbands who themselves had viable offspring from previous wives; and three of them, who belonged to a family with extensive intermarriage, had a pedigree consistent with an autosomal recessive maternal-effect mutation. CONCLUSIONS: Recurrent pregnancy loss due to habitual molar pregnancy is uncommon and familial cases are extremely rare. The etiology of this disorder is not well understood but likely results from a maternal-effect mutation. Management options are limited, especially for couples who desire to have their own genetic offspring. 相似文献
76.
77.
Gerard M Ribbers Theo Mulder Alexander C Geurts Rob A den Otter 《Archives of physical medicine and rehabilitation》2002,83(1):81-85
OBJECTIVE: To test whether central motor processing can be impaired in chronic reflex sympathetic dystrophy (RSD). DESIGN: Experimental 2-group analysis. SETTING: Tertiary care center in the Netherlands. PARTICIPANTS: Five patients with stage 3 RSD of the left forearm, free of symptoms and complaints in the right forearm; and 10 healthy control subjects. INTERVENTION: On a digitizer, RSD patients and controls had to draw 3 sequences of graphemes of different complexity with their (unaffected) dominant right hand. The drawing tracks were segmented in time periods between points of velocity minima of the pen tip. MAIN OUTCOME MEASURES: Mean velocity, coefficients of variation of both length and movement time per segment, and mean intersegmental pausing time were calculated for each sequence. RESULTS: A repeated-measures analysis of variance by using the multivariate method yielded a 35% lower mean velocity (F(1,13) = 5.83, P =.031), a 110% larger segment length variability (F(1,13) = 9.72, P =.008) and a 60% larger variability of movement time per segment (F(1,13) = 5.78, P =.032) in RSD patients. No group difference was found for intersegmental pausing time or any interaction effect with the type of task. CONCLUSION: Patients with chronic RSD have a normal ability to preprogram sequential movements of their unaffected hand; but with impaired temporospatial coding and movement execution. We concluded that cortical mechanisms may be involved in motor impairments in patients with chronic RSD. 相似文献
78.
79.
80.