全文获取类型
收费全文 | 58713篇 |
免费 | 3198篇 |
国内免费 | 62篇 |
专业分类
耳鼻咽喉 | 878篇 |
儿科学 | 1765篇 |
妇产科学 | 1351篇 |
基础医学 | 8682篇 |
口腔科学 | 2163篇 |
临床医学 | 5510篇 |
内科学 | 10517篇 |
皮肤病学 | 1446篇 |
神经病学 | 6221篇 |
特种医学 | 2891篇 |
外科学 | 8184篇 |
综合类 | 202篇 |
一般理论 | 32篇 |
预防医学 | 3812篇 |
眼科学 | 1168篇 |
药学 | 3961篇 |
中国医学 | 87篇 |
肿瘤学 | 3103篇 |
出版年
2023年 | 321篇 |
2022年 | 216篇 |
2021年 | 487篇 |
2020年 | 568篇 |
2019年 | 601篇 |
2018年 | 1294篇 |
2017年 | 1106篇 |
2016年 | 1432篇 |
2015年 | 1149篇 |
2014年 | 1317篇 |
2013年 | 2457篇 |
2012年 | 3076篇 |
2011年 | 3520篇 |
2010年 | 1859篇 |
2009年 | 1171篇 |
2008年 | 3518篇 |
2007年 | 3695篇 |
2006年 | 3460篇 |
2005年 | 3372篇 |
2004年 | 3229篇 |
2003年 | 3278篇 |
2002年 | 3191篇 |
2001年 | 2538篇 |
2000年 | 3261篇 |
1999年 | 1719篇 |
1998年 | 583篇 |
1997年 | 520篇 |
1996年 | 376篇 |
1995年 | 317篇 |
1994年 | 331篇 |
1993年 | 309篇 |
1992年 | 279篇 |
1991年 | 229篇 |
1990年 | 227篇 |
1989年 | 296篇 |
1988年 | 234篇 |
1987年 | 232篇 |
1986年 | 238篇 |
1985年 | 301篇 |
1984年 | 327篇 |
1983年 | 269篇 |
1982年 | 270篇 |
1981年 | 217篇 |
1980年 | 217篇 |
1979年 | 236篇 |
1978年 | 179篇 |
1977年 | 195篇 |
1976年 | 201篇 |
1975年 | 170篇 |
1973年 | 168篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
31.
32.
M P?iv?nsalo J Heikkil? K Huttunen 《R?ntgen-Bl?tter; Zeitschrift für R?ntgen-Technik und medizinisch-wissenschaftliche Photographie》1987,40(4):110-112
A change in transplant size, which can easily be measured by ultrasound, is one indicator of acute or chronic rejection. We report here on 49 areal measurements of transplant size from a coronal section and compare the results with isotopically measured areas. The areas measured in the isotope examinations correlated well with those measured sonographically (r = 0.82) in the case of the 33 transplants with a normal perfusion index but poorly (r = 0.45) in those with an abnormal perfusion index. The sonographically measured transplant area was about 85 cm2 in cases of acute rejection, 54 cm2 in cases of chronic rejection and 62 cm2 in cases with normal or slightly impaired transplant function (creatinine level below 200 mumol). Sonography is more suitable than isotope examination for monitoring transplant size in cases with poor perfusion. 相似文献
33.
Dr. J.-T. Gräsner M. Fischer K. H. Altemeyer J. Bahr B. W. Böttiger V. Dörges R. Franz A. Gries H. Krieter M. Messelken T. Rosolski M. Ruppert T. Schlechtriemen J. Scholz J. Schüttler B. Wolke J. F. Zander 《Notfall & Rettungsmedizin》2005,8(2):112-115
Within the scope of the symposium “Rescue Medicine in Germany” (held at the Reisensburg near Ulm in 2002), the need for a standardized data acquisition set for prehospital cardiac arrest patients was identified. Therefore, the working group “Emergency Medicine” of the German Society of Anesthesiology and Intensive Care Medicine (DGAI) created a nationwide data acquisition system for primary medical care in prehospital cardiac arrest patients treated with cardiopulmonary resuscitation procedures. The system is in full accordance with the “Utstein style.” Integration of this data acquisition system, for example into the “Dortmund protocol,” is providing a standardized data web base of all acquired prehospital data analyze and to compare processing and structural quality. As additional modules for this nationwide data web base system, an inhospital module “further clinical treatment” and a “long-term follow-up” module are currently in the developmental process. 相似文献
34.
Dipl. Rettungssanitäter H. Regener Master of Medical Education 《Notfall & Rettungsmedizin》2005,8(5):346-353
Learning and exams are closely interconnected. Test elements should accompany the learning process and not only serve to complete the training period. Examinations should be oriented toward the ideas learned and the forms of instruction used. However, the significance of examinations during the training period for emergency medical technicians is hardly ever addressed in the literature. All of the procedures that serve to evaluate the students’ performance are subsumed under the term “assessments.” This contribution presents the tasks of assessments and their requirements for occupational training of certified emergency medical technicians. It also offers a suggestion to develop a modern testing concept. 相似文献
35.
36.
37.
Respiratory symptoms and lung function following exposure in workers exposed to soft paper tissue dust 总被引:3,自引:0,他引:3
Jens Ericsson Bengt Järvholm Fredrik Norin 《International archives of occupational and environmental health》1988,60(5):341-345
Summary The objective of this study was to investigate if the dust in a mill producing soft paper tissue caused respiratory symptoms or impaired respiratory function. Using a questionnaire and spirometry, 355 persons were examined. They were divided into three groups according to present exposure to dust; low (< 1 mg/m3), moderate (1–5 mg/m3) and heavy (> 5 mg/m3). There was a dose-dependent increase of symptoms from the upper respiratory tract. However, coughing and coughing with phlegm were not found to be more common among persons with heavy exposure compared to those with low exposure to the dust. There was no difference in FEV, or FVC during a work shift. Persons with long-term (> 10 years) and heavy exposure to dust seemed to have impaired respiratory function compared to those with low and/or short-term exposure to the dust. 相似文献
38.
A. Grubert K. Koch F. Fallenstein L. Spätling 《Archives of gynecology and obstetrics》1993,254(1-4):1438-1439
Ohne Zusammenfassung 相似文献
39.
Summary
In the last decades back pain has reached dramatic proportions in industrialized countries. Disorders of the back are nowadays
the leading cause of direct and indirect health care costs. Accurate prevalence estimates are needed to serve as a basis for
health care evaluations. A review of epidemiologic studies in the general population reveals that back pain has reached a
prevalence of 40 % for current pain. 7 to 18 % are “frequently”, “often”, “daily” or “constantly” affected. 75 % of the adult
population suffers from back pain during the last year. 80 to 90 % of the adult population in industrialized countries experience
back pain ever. Gender specific differences are only present in severe, chronic forms which are more often experienced by
women. Back pain has a prevalence maximum at 50 to 64 years. Older persons display lower prevalence estimates. The prevalence
maximum in men is one decade earlier than in women. There are several potential explanations for this prevalence pattern that
are discussed in the article. Back pain can be classified by location, temporal characteristics, pain intensity and pain history.
Currently, for none of these dimensions generally accepted, uniformly employed and validated definitions are available. In
most of the industrialized countries back pain is one of the most expensive symptoms. 75–90 % of the direct and indirect health
care costs were caused by those 5–10 % of patients who are disabled. As predictors of back pain a history of back pain and
job satisfaction play by far a more important role than the extensively studied mechanical factors. For a first episode of
back pain the prognosis is favorable. If the pain persist for more than three months the prognosis is unfavorable. After six
months of absenteeism because of back pain more than half of the afflicted never return to work. Rarely back pain is present
as a single symptom. In more than 80 % back pain is associated with pain in at least one joint. It remains to be studied if
back pain may be viewed as an entity or as part of a more complex pain syndrome.
相似文献
40.
From 1980 to 1990 152 patients underwent Fontan operation at our institution. The following patient groups amenable for Fontan operation were identified: 1) patients with tricuspid atresia (n=82, 54.0%); 2) patients with single ventricle (n=31,20.3%), 3) patients with a wide variety of “complex”, non correctable cardiac malformations (n=39, 25.7%). Actuarial survival rate was 83.8±3.1% (mean±SEM) at 10 years. Follow up revealed, that more than 90.0% of the patients feel better than before operation, about 50.0% are without cyanosis, more than 70.0% are in sinus rhythm, and 90.0% of the patients are socialized according to their age. Considering the poor prognosis of these patients without an operation, the Fontan procedure offers a sufficient palliative method in the therapeutic approach up to now. 相似文献