全文获取类型
收费全文 | 14471篇 |
免费 | 971篇 |
国内免费 | 21篇 |
专业分类
耳鼻咽喉 | 90篇 |
儿科学 | 487篇 |
妇产科学 | 377篇 |
基础医学 | 1826篇 |
口腔科学 | 79篇 |
临床医学 | 2103篇 |
内科学 | 2677篇 |
皮肤病学 | 180篇 |
神经病学 | 1345篇 |
特种医学 | 304篇 |
外科学 | 1328篇 |
综合类 | 167篇 |
一般理论 | 16篇 |
预防医学 | 2023篇 |
眼科学 | 178篇 |
药学 | 970篇 |
中国医学 | 15篇 |
肿瘤学 | 1298篇 |
出版年
2024年 | 14篇 |
2023年 | 98篇 |
2022年 | 151篇 |
2021年 | 331篇 |
2020年 | 219篇 |
2019年 | 377篇 |
2018年 | 406篇 |
2017年 | 309篇 |
2016年 | 330篇 |
2015年 | 388篇 |
2014年 | 503篇 |
2013年 | 773篇 |
2012年 | 1184篇 |
2011年 | 1160篇 |
2010年 | 603篇 |
2009年 | 578篇 |
2008年 | 934篇 |
2007年 | 1093篇 |
2006年 | 1017篇 |
2005年 | 1020篇 |
2004年 | 897篇 |
2003年 | 871篇 |
2002年 | 745篇 |
2001年 | 102篇 |
2000年 | 60篇 |
1999年 | 113篇 |
1998年 | 150篇 |
1997年 | 113篇 |
1996年 | 92篇 |
1995年 | 104篇 |
1994年 | 83篇 |
1993年 | 72篇 |
1992年 | 46篇 |
1991年 | 37篇 |
1990年 | 39篇 |
1989年 | 29篇 |
1988年 | 36篇 |
1987年 | 34篇 |
1986年 | 28篇 |
1985年 | 22篇 |
1984年 | 42篇 |
1983年 | 29篇 |
1982年 | 40篇 |
1981年 | 40篇 |
1980年 | 28篇 |
1979年 | 16篇 |
1978年 | 18篇 |
1977年 | 10篇 |
1976年 | 18篇 |
1975年 | 13篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
21.
Suzanne D. LeBlang M.D. Diego B. Nuñez M.D. Anton Serafini M.D. Robert C. Duncan Ph.D. M. Judith Donovan Post M.D. Berta M. Montalvo M.D. Jose I. Becerra M.D. 《Emergency radiology》1997,4(4):191-199
The purpose of this study was to evaluate the ability of helical computed tomography (CT) to detect arterial injuries in gunshot wounds to the neck. In a blinded retrospective review, 54 helical CT scans of the cervical spine were evaluated for bullet/bone fragments, subcutaneous air, bullet path, hematoma, spine fractures, and pharyngoesophageal compromise. The distance of fragments to a major vessel was calculated. CT findings that correlated significantly with major arterial injury included the presence of fragments (bullet/bone) close to a major vessel (2.5 mm) and spine fractures. Visualizing fragments <5 mm from a vessel or a transcervical bullet trajectory predicted 12 of 13 major arterial injuries. We conclude that CT clearly depicts anatomic damage. Specific findings, such as the location of fragments and bullet trajectory adjacent to a vessel and spine fractures, indicate a higher probability of vascular damage, thus directing more definitive evaluation. 相似文献
22.
Sarah N. Flier M.D. Suzanne Rose M.D. M.S.Ed. 《The American journal of gastroenterology》2006,101(S3):S644-S653
Dyspepsia is a remarkably common symptom in the general population. Although multiple definitions have been used to describe the symptom, the most common explanation is that of chronic or recurrent pain or discomfort (a subjective negative feeling that may be associated with early satiety, fullness, bloating, or nausea) centered in the upper abdomen. When a thorough evaluation of a dyspeptic patient fails to identify a cause for her symptoms, the label of nonulcer or functional dyspepsia is applied. Functional dyspepsia is a heterogeneous disorder characterized by relapsing and remitting symptoms. Treatment strategies should focus on alleviating the most bothersome symptom and can be based on the proposed underlying pathophysiology. The effect of gender on mechanisms of disease, symptom presentation, and treatment response is an area of increasing interest and study. As with other functional gastrointestinal disorders, there appear to be some gender-specific features of functional dyspepsia. Specifically, gender-related differences have been observed in some studies of both the prevalence of individual dyspepsia symptoms, and in gastric emptying and proximal gastric motor function. There also appear to be gender differences in the psychosocial realm, with dyspeptic women experiencing a lesser sense of well-being than dyspeptic men, as well as an association of an abuse history with functional dyspepsia. This review will highlight specific gender differences related to the symptom presentation, pathophysiology, and approach to treatment of functional dyspepsia, while noting where differences have not been found and where further investigation is warranted. 相似文献
23.
24.
25.
26.
27.
28.
Suzanne C. Tough David W. Johnston Jodi E. Siever Gayleen Jorgenson Linda Slocombe Carolyn Lane Margaret Clarke 《分娩》2006,33(3):183-194
ABSTRACT: Background: The addition of supplementary prenatal support may improve the health and well‐being of high‐risk women and families. The objective of this randomized controlled trial was to examine the impact of supplementary prenatal care on resource use among a community‐based population of pregnant women. Methods: Pregnant women from three urban maternity clinics were randomized (a) to current standard of physician care, (b) to current standard of care plus consultation with a nurse, or (c) to (b) plus consultation with a home visitor. Participants were 1,352 women who received 3 telephone interviews. The primary outcome was resource use (e.g., attended prenatal classes, used nutritional counseling). Results: Overall, those in the nurse intervention group were more likely to attend an “Early Bird” prenatal class and parenting classes, and to use nutrition counseling and agencies that assist with child care. Women provided with extra nursing and home visitation supports were more likely to use a written resource guide, nutrition counseling, and agencies that assist with child care. Among women at higher risk (e.g., language barriers, young maternal age, low income), the nurse intervention significantly increased use of early prenatal classes, whereas the nurse and home visitor intervention significantly increased use of the written resource guide and nutrition counseling. The intervention substantially increased the amount of information received on numerous pregnancy‐related topics but had little impact on resource use for mental health and poverty‐related needs. Among those with added support, resource use among low‐risk women was generally greater than among high‐risk women. Conclusions: Additional support provided by nurses, or nurses and home visitors, can successfully address informational needs and increase the likelihood that women will use existing community‐based resources. This finding was true even for high‐risk women, although this intervention did not reduce the difference in resource use between high‐ and low‐risk women. (BIRTH 33:3 September 2006) 相似文献
29.
Huntington's disease (HD) is a neurodegenerative disorder associated with expansion of CAG trinucleotide repeats in the huntingtin gene. A minimum of 36 CAG repeats is usually reported in patients with clinical features of HD; 30 to 35 repeats represent an intermediate range. Here we report a 65-year-old male with autopsy-proven HD and 29 CAG repeats. 相似文献
30.
Lorraine N Clark Eneli Haamer Helen Mejia-Santana Juliette Harris Suzanne Lesage Alexandra Durr Sabine Janin Bs Katja Hedrich Elan D Louis Lucien J Cote Howard Andrews Stanley Fahn Cheryl Waters Blair Ford Steven Frucht William Scott Christine Klein Alexis Brice Hanno Roomere Ruth Ottman Karen Marder 《Movement disorders》2007,22(7):932-937
Parkin mutations account for the majority of familial and sporadic early onset Parkinson's disease (EOPD) cases with a known genetic association. More than 100 mutations have been described in the Parkin gene that includes homozygous, compound heterozygous, and single heterozygous mutations. We have designed a Parkin mutation genotyping array (gene chip) that includes published Parkin sequence variants and allows their simultaneous detection. The chip was validated by screening 85 PD cases and 47 controls previously tested for Parkin mutations. Similar genotyping microarrays have been developed for other genetically heterogeneous diseases including age-related macular degeneration. Here, we show the utility of a genotyping array for Parkinson's disease by analysis of 60 subjects from the Genetic Epidemiology of Parkinson Disease (GEPD) study that includes 15 early-onset PD case probands and 45 relatives. 相似文献