全文获取类型
收费全文 | 6171篇 |
免费 | 339篇 |
国内免费 | 57篇 |
专业分类
耳鼻咽喉 | 28篇 |
儿科学 | 214篇 |
妇产科学 | 235篇 |
基础医学 | 640篇 |
口腔科学 | 75篇 |
临床医学 | 608篇 |
内科学 | 1255篇 |
皮肤病学 | 64篇 |
神经病学 | 687篇 |
特种医学 | 399篇 |
外科学 | 498篇 |
综合类 | 326篇 |
一般理论 | 4篇 |
预防医学 | 636篇 |
眼科学 | 64篇 |
药学 | 445篇 |
3篇 | |
中国医学 | 99篇 |
肿瘤学 | 287篇 |
出版年
2022年 | 43篇 |
2021年 | 78篇 |
2020年 | 64篇 |
2019年 | 75篇 |
2018年 | 103篇 |
2017年 | 111篇 |
2016年 | 105篇 |
2015年 | 123篇 |
2014年 | 146篇 |
2013年 | 238篇 |
2012年 | 333篇 |
2011年 | 325篇 |
2010年 | 202篇 |
2009年 | 214篇 |
2008年 | 329篇 |
2007年 | 310篇 |
2006年 | 304篇 |
2005年 | 301篇 |
2004年 | 239篇 |
2003年 | 228篇 |
2002年 | 175篇 |
2001年 | 194篇 |
2000年 | 180篇 |
1999年 | 132篇 |
1998年 | 78篇 |
1997年 | 82篇 |
1996年 | 89篇 |
1995年 | 76篇 |
1994年 | 69篇 |
1993年 | 71篇 |
1992年 | 94篇 |
1991年 | 91篇 |
1990年 | 93篇 |
1989年 | 97篇 |
1988年 | 100篇 |
1987年 | 81篇 |
1986年 | 63篇 |
1985年 | 86篇 |
1984年 | 67篇 |
1983年 | 39篇 |
1981年 | 26篇 |
1980年 | 26篇 |
1979年 | 30篇 |
1975年 | 33篇 |
1959年 | 41篇 |
1958年 | 66篇 |
1957年 | 75篇 |
1956年 | 73篇 |
1955年 | 83篇 |
1954年 | 51篇 |
排序方式: 共有6567条查询结果,搜索用时 625 毫秒
91.
Visser AP 《Patient counselling and health education》1980,2(2):51-64
Although informational booklets are being used increasingly in Dutch hospitals, little is known of their effects and the conditions for optimal use. Various aspects of the use and effects of a specially developed information booklet were investigated in two surgical wards of a general hospital. The booklet gave information about ward procedures, operative routines, narcosis, and psychosocial care possibilities. Both before and after introduction of the booklet we gathered data on the satisfaction, knowledge, and emotional state of patients on the two wards and their perception of the care climate. Patients on the control ward received just the booklet. On the experimental ward staff nurses were trained in nondirective therapeutic skills, and measurements were repeated on both wards after this intervention. In a third manipulation on the experimental ward, some of the patients had a supportive and informative talk with a trained nurse. Although patients appreciated and read the booklet better than a general hospital leaflet, the results show that the booklet and other supporting measures had no effect on the patients' perception of their well-being. 相似文献
92.
The past 15 years the field of molecular biology and especially DNA technology has developed rapidly. This did not leave microbiology unaffected. DNA sequencing and the use of DNA probes led to new insights in the evolution and spread of antibiotic resistance genes. It became clear that resistance determinants often show partial homology even when species are not closely related. DNA probes have established their value as epidemiological tools and currently efforts are being made to introduce them into routine diagnostics. 相似文献
93.
Visser PC 《Michigan hospitals》1982,18(12):18-9, 21
94.
高效液相色谱法测定绿茶和饮料中的咖啡因 总被引:5,自引:0,他引:5
采用反相高效液相色谱法,固定相为十八烷基硅烷键合硅胶,以乙腈-水(20:80)为流动相,检测波长274nm,测定绿茶和饮料中的咖啡因含量。结果线性范围为3.9~3900ng,r=O.9999;绿茶和2种饮料的平均加样回收率分别为100.2%、100.1%和99.8%。该方法准确、简便、快速,适合绿茶和可乐型饮料中咖啡因的测定。 相似文献
95.
96.
Gender differences in stage-adjusted bladder cancer survival 总被引:3,自引:0,他引:3
Mungan NA Aben KK Schoenberg MP Visser O Coebergh JW Witjes JA Kiemeney LA 《Urology》2000,55(6):387-880
OBJECTIVES: Gender differences have been observed in the prognosis of patients with bladder cancer. It has also been suggested that these differences are caused by a worse stage distribution at diagnosis among women. The purpose of this study was to evaluate whether women with bladder cancer have a worse prognosis even after adjustment for disease stage at first presentation. METHODS: Data on patients with bladder cancer diagnosed between 1973 and 1996 and registered by one of the nine population-based Surveillance, Epidemiology, and End Results (SEER) cancer registries in the United States (n = 80,305) were obtained from the National Cancer Institute public domain SEER*Stat 2.0 package. Similar data on patients with bladder cancer diagnosed between 1987 and 1994 and registered by two population-based registries in the Netherlands (n = 1722) were obtained through the Comprehensive Cancer Centers, Amsterdam and South. Survival rates adjusted for mortality owing to other causes (ie, relative survival) were calculated for men and women within each category of the American Joint Committee on Cancer (SEER data) and TNM (Netherlands data) stage groupings.Results. In the United States, the 5-year relative survival rate of male patients with bladder cancer was calculated to be 79.5% (95% confidence interval 79.0% to 80.0%). Among women, the 5-year relative survival rate was significantly worse: 73.1% (95% confidence interval 72.2% to 74.0%). The male versus female 5-year survival rate among stage groups I, II, III, and IV was 96.5% versus 93.7%, 65.5% versus 59.6%, 58.8% versus 49.6%, and 27.1% versus 15.2%, respectively. The (sparser) data from the Netherlands were less conclusive. Women with Stage II and Stage IV disease fared worse than men but the reverse seemed to be true in Stage I disease. CONCLUSIONS: Female patients with bladder cancer have a worse prognosis than male patients. It is unlikely that the difference can explained entirely by the more frequent diagnosis of higher stages at first presentation among women. 相似文献
97.
98.
Abstract: Haemoptysis in otherwise healthy children is an uncommon event. Two cases of massive haemoptysis, subsequently requiring lobectomy, are discussed. In each case, foreign vegetable matter was identified despite previously normal bronchoscopy and minimal changes on chest radiograph. 相似文献
99.
OBJECTIVE: Because survival from admission to discharge does not provide parents and physicians information about future life expectancy in the premature neonate, we characterized the actuarial survival, defined as the future life expectancy from a given postnatal age, in a large inborn population of premature infants < 30 weeks' gestation. STUDY DESIGN: We determined daily actuarial survival of 1925 inborn infants (23 to 29 weeks' gestation) admitted to the Baylor Affiliated Nurseries from July 1986 through December 1994, stratified by 100-g birth weight and by 1-week gestational-age intervals. RESULTS: In the 501- to 600-g birth weight stratum, actuarial survival improved from 31% at birth, to 61% on day of life 7, and then to 75% on day of life 28; in the 901- to 1000-g birth weight stratum, actuarial survival improved from 88%, to 94%, and then to 98% throughout the same times, respectively. Similar trends were obtained when data were stratified by gestational age. CONCLUSIONS: Survival in the smallest infants improves dramatically during the first few days of life, but there is a significant risk for late death in the smallest of these infants. 相似文献
100.
E. M. Smets M. R. Visser A. F. Willems-Groot B. Garssen A. L. Schuster-Uitterhoeve J. C. de Haes 《British journal of cancer》1998,78(7):907-912
Little is known regarding the prevalence and course of fatigue in cancer patients after treatment has ended and no recurrence found. The present study examines fatigue in disease-free cancer patients after being treated with radiotherapy (n = 154). The following questions are addressed. First, how do patients describe their fatigue 9 months after radiotherapy and is this different from fatigue in a nonselective sample from the general population (n = 139)? Secondly, to what degree is fatigue in patients associated with sociodemographic, medical, physical and psychological factors? Finally, is it possible to predict which patients will suffer from fatigue 9 months after radiotherapy? Results indicated that fatigue in disease-free cancer patients did not differ significantly from fatigue in the general population. However, for 34% of the patients, fatigue following treatment was worse than anticipated, 39% listed fatigue as one of the three symptoms causing them most distress, 26% of patients worried about their fatigue and patients'' overall quality of life was negatively related to fatigue (r = -0.46). Fatigue in disease-free patients was significantly associated with: gender, physical distress, pain rating, sleep quality, functional disability, psychological distress and depression, but not with medical (diagnosis, prognosis, co-morbidity) or treatment-related (target area, total radiation dose, fractionation) variables. The degree of fatigue, functional disability and pain before radiotherapy were the best predictors of fatigue at 9-month follow-up, explaining 30%, 3% and 4% of the variance respectively. These findings are in line with the associations found with fatigue during treatment as reported in the preceding paper in this issue. The significant associations between fatigue and both psychological and physical variables demonstrate the complex aetiology of this symptom in patients and point out the necessity of a multidisciplinary approach for its treatment. 相似文献