全文获取类型
收费全文 | 15597篇 |
免费 | 790篇 |
国内免费 | 58篇 |
专业分类
耳鼻咽喉 | 138篇 |
儿科学 | 252篇 |
妇产科学 | 323篇 |
基础医学 | 2234篇 |
口腔科学 | 408篇 |
临床医学 | 1468篇 |
内科学 | 3308篇 |
皮肤病学 | 363篇 |
神经病学 | 1770篇 |
特种医学 | 797篇 |
外国民族医学 | 1篇 |
外科学 | 2035篇 |
综合类 | 79篇 |
一般理论 | 1篇 |
预防医学 | 855篇 |
眼科学 | 241篇 |
药学 | 1198篇 |
中国医学 | 60篇 |
肿瘤学 | 914篇 |
出版年
2021年 | 224篇 |
2020年 | 138篇 |
2019年 | 190篇 |
2018年 | 224篇 |
2017年 | 224篇 |
2016年 | 269篇 |
2015年 | 324篇 |
2014年 | 382篇 |
2013年 | 529篇 |
2012年 | 846篇 |
2011年 | 889篇 |
2010年 | 553篇 |
2009年 | 597篇 |
2008年 | 864篇 |
2007年 | 941篇 |
2006年 | 921篇 |
2005年 | 972篇 |
2004年 | 887篇 |
2003年 | 892篇 |
2002年 | 920篇 |
2001年 | 333篇 |
2000年 | 334篇 |
1999年 | 336篇 |
1998年 | 215篇 |
1997年 | 154篇 |
1996年 | 130篇 |
1995年 | 116篇 |
1994年 | 110篇 |
1993年 | 83篇 |
1992年 | 132篇 |
1991年 | 123篇 |
1990年 | 132篇 |
1989年 | 155篇 |
1988年 | 138篇 |
1987年 | 125篇 |
1986年 | 131篇 |
1985年 | 137篇 |
1984年 | 104篇 |
1983年 | 89篇 |
1981年 | 73篇 |
1980年 | 69篇 |
1979年 | 107篇 |
1978年 | 83篇 |
1977年 | 80篇 |
1976年 | 74篇 |
1974年 | 70篇 |
1973年 | 97篇 |
1972年 | 78篇 |
1971年 | 90篇 |
1970年 | 70篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Die Anaesthesiologie - Eine junge Patientin erleidet während der Anlage einer axillären Plexusblockade einen generalisierten Krampfanfall. Die Mechanismen, im Wesentlichen die vermutlich... 相似文献
3.
Elizabeth A. Mosley PhD MPH Amy J. Schulz PhD MPH MSW Lisa H. Harris MD PhD Barbara A. Anderson PhD 《Women & health》2020,60(7):806-820
ABSTRACT Abortion is legal in South Africa, but negative abortion attitudes remain common and are poorly understood. We used nationally representative South African Social Attitudes Survey data to analyze abortion attitudes in the case of fetal anomaly and in the case of poverty from 2007 to 2016 (n = 20,711; ages = 16+). We measured correlations between abortion attitudes and these important predictors: religiosity, attitudes about premarital sex, attitudes about preferential hiring and promotion of women, and attitudes toward family gender roles. Abortion acceptability for poverty increased over time (b = 0.05, p < .001), but not for fetal anomaly (b = ?0.008, p = .284). Highly religious South Africans reported lower abortion acceptability in both cases (Odds Ratio (OR)anomaly = 0.85, p = .015; ORpoverty = 0.84, p = .02). Premarital sex acceptability strongly and positively predicted abortion acceptability (ORanomaly = 2.63, p < .001; ORpoverty = 2.46, p < .001). Attitudes about preferential hiring and promotion of women were not associated with abortion attitudes, but favorable attitudes about working mothers were positively associated with abortion acceptability for fetal anomaly ((ORanomaly = 1.09, p = .01; ORpoverty = 1.02, p = .641)). Results suggest negative abortion attitudes remain common in South Africa and are closely tied to religiosity, traditional ideologies about sexuality, and gender role expectations about motherhood. 相似文献
4.
5.
Clinical Epileptology - Der plötzliche unerwartete Tod stellt eine seltene, aber schwerwiegende Komplikation für Epilepsiepatienten dar. Das Risiko hierfür ist u. a. nachts und... 相似文献
6.
Lei Li Jürgen Bruns Reinhard E. Friedrich Rainer Schmelzle 《European journal of plastic surgery》2006,29(2):93-96
Adamantinoma of long bones is one of the rarest of malignant bone tumors; it is commonly located in the middle or lower third of the diaphysis of the tibia. A case with multiple occurrences affecting both the tibia and fibula is presented. En bloc resection with wide operative margins was performed, and a large tibial defect of 23 cm was effectively bridged by a revascularized free fibular flap. At 13 months follow-up, there was no sign of local recurrence or metastasis, and the patient was mobile. 相似文献
7.
Jan M?schwitzer Rainer H Müller 《European journal of pharmaceutics and biopharmaceutics》2006,62(3):282-287
High pressure homogenization can be employed to produce drug nanocrystals with a number of advantages, like improved solubility behaviors, better drug targeting or even increased mucoadhesiveness. To obtain a controlled drug delivery system it is necessary to transform the resulting nanosuspension into a solid dosage form. The present study shows the feasibility to use a mucoadhesive nanosuspension of poorly soluble hydrocortisone acetate produced by high pressure homogenization as layering dispersion in a fluidized bed process, followed by the application of an enteric coating to achieve a controlled drug release. To point out the advantages of drug nanocrystals the new fomulation was compared with a formulation containing micronized drug. Both formulations were characterized with regard to their particle size and crystallinity by using laser diffractometry, photon correlation spectroscopy and X-ray diffraction. The pellet morphology was characterized by using the environmental scanning electron microscopy (ESEM). In the in vitro dissolution tests an accelerated dissolution velocity and an increased drug release could be shown for the pellets containing drug nanocrystals. 相似文献
8.
9.
10.
Inflammatory bowel disease: re-evaluation of the diagnosis in a prospective population based study in south eastern Norway. 总被引:1,自引:0,他引:1
BACKGROUND: The incidence figures for ulcerative colitis (UC) and Crohn's disease (CD) have been difficult to interpret, and geographical variations may be due to differences in classification criteria and study design. Few studies have based the incidence on prospective systematic follow up to confirm the initial diagnosis. METHODS: Between 1990 and 1993, in a prospective incidence study of inflammatory bowel disease (IBD) in south eastern Norway, 527 cases of UC, 228 cases of CD, 36 cases of indeterminate colitis (IND), and 55 cases of possible IBD were identified, yielding an annual incidence of 13.6, 5.9, 0.9, and 1.4 per 10(5) respectively. The diagnosis and all clinical data were reviewed by two gastroenterologists independently of each other. One to two years after diagnosis, all patients were offered a clinical follow up in which the initial diagnosis was assessed. RESULTS: Between the time of diagnosis and the follow up, 16 patients had died, four of complications related to IBD. Of the remaining 830 patients, 98% (814/830) were available for follow up, 93% (772/830) attended a clinical examination which included a colonoscopy in 77% (637/830), and the remainder had had a telephone interview, or reassessment based on hospital records, or both. Twenty seven patients were reclassified as not having IBD (3%), and 65 patients were characterised as possible IBD (8%). Of the patients initially classified as UC, 88% had their diagnosis confirmed, compared with 91% with an initial diagnosis of CD. In patients with indeterminate colitis, 33% were classified as definite UC and 17% as CD. This reclassification of patients yielded a corrected annual incidence of 12.8 for UC and 6.0 for CD. CONCLUSION: At follow up one to two years after the diagnosis of IBD, the initial incidence was only marginally altered. This is probably due to uniform inclusion criteria and careful diagnostic methods. The study also illustrates the importance of the re-evaluation of the initial diagnosis as close to 10%, both among patients with UC and CD, were reclassified at follow up. 相似文献