全文获取类型
收费全文 | 1087篇 |
免费 | 48篇 |
国内免费 | 147篇 |
专业分类
儿科学 | 68篇 |
妇产科学 | 5篇 |
基础医学 | 68篇 |
口腔科学 | 21篇 |
临床医学 | 164篇 |
内科学 | 284篇 |
皮肤病学 | 29篇 |
神经病学 | 18篇 |
特种医学 | 310篇 |
外科学 | 57篇 |
综合类 | 26篇 |
预防医学 | 55篇 |
眼科学 | 13篇 |
药学 | 112篇 |
1篇 | |
肿瘤学 | 51篇 |
出版年
2023年 | 5篇 |
2022年 | 2篇 |
2021年 | 4篇 |
2020年 | 3篇 |
2019年 | 9篇 |
2018年 | 18篇 |
2017年 | 9篇 |
2016年 | 10篇 |
2015年 | 16篇 |
2014年 | 16篇 |
2013年 | 39篇 |
2012年 | 15篇 |
2011年 | 17篇 |
2010年 | 32篇 |
2009年 | 42篇 |
2008年 | 23篇 |
2007年 | 110篇 |
2006年 | 23篇 |
2005年 | 37篇 |
2004年 | 16篇 |
2003年 | 3篇 |
2002年 | 21篇 |
2001年 | 27篇 |
2000年 | 14篇 |
1999年 | 21篇 |
1998年 | 80篇 |
1997年 | 79篇 |
1996年 | 71篇 |
1995年 | 65篇 |
1994年 | 43篇 |
1993年 | 53篇 |
1992年 | 8篇 |
1991年 | 20篇 |
1990年 | 13篇 |
1989年 | 51篇 |
1988年 | 32篇 |
1987年 | 32篇 |
1986年 | 25篇 |
1985年 | 25篇 |
1984年 | 19篇 |
1983年 | 12篇 |
1982年 | 27篇 |
1981年 | 14篇 |
1980年 | 14篇 |
1979年 | 6篇 |
1978年 | 4篇 |
1977年 | 16篇 |
1976年 | 28篇 |
1975年 | 13篇 |
排序方式: 共有1282条查询结果,搜索用时 0 毫秒
51.
52.
An in vitro is described that attempts to detect patients with a potential for adverse systemic reactions to contrast material. This test involves measuring the rate of conversion of prekallikrein to kallikrein under certain standard conditions. In a preliminary retrospective study, the test could be used to identify such patients with a sensitivity of 88%, a specificity of 82%, and a predictive value of 79%. 相似文献
53.
Amodio J Spektor V Pramanik B Rivera R Pinkney L Fefferman N 《Pediatric radiology》2005,35(11):1113-1117
We present an infant with macrocrania, who initially demonstrated prominent extra-axial fluid collections on sonography of the brain, compatible with benign infantile hydrocephalus (BIH). Because of increasing macrocrania, a follow-up sonogram of the brain was performed; it revealed progressive enlargement of the extra-axial spaces, which now had echogenic debris. Color Doppler US showed bridging veins traversing these extra-axial spaces, so it was initially thought that these spaces were subarachnoid in nature (positive cortical vein sign). However, an arachnoid membrane was identified superior to the cortex, and there was compression of true cortical vessels beneath this dural membrane. An MRI of the brain showed the extra-axial spaces to represent bilateral subdural hematomas. The pathogenesis of spontaneous development of the subdural hematomas, in the setting of BIH, is discussed. We also emphasize that visualizing traversing bridging veins through extra-axial spaces does not necessarily imply that these spaces are subarachnoid in origin. 相似文献
54.
This article discusses the imaging evaluation of chest wall disorders in children. 相似文献
55.
Fefferman NR Pinkney LP Rivera R Popiolek D Hummel-Levine P Cosme J 《Pediatric radiology》2003,33(1):56-58
Sclerosing stromal tumor (SST) is a rare benign ovarian neoplasm of stromal origin with less than 100 cases reported in the literature. Unlike the other stromal tumors, thecomas and fibromas, which tend to occur in the fifth and sixth decades, sclerosing stromal tumors predominantly affect females in the second and third decades. Computed tomography (CT), magnetic resonance imaging (MRI), and ultrasound findings have been described, but have not been reported previously in the pediatric literature. We present a case of SST of the ovary in a 10-year-old premenarchal female, the youngest patient to our knowledge reported in the literature, and describe the ultrasound and CT findings with pathologic correlation. 相似文献
56.
Excel97在药物分析中的应用 总被引:1,自引:0,他引:1
目的:在药物分析中,电子表格软件MicrosoftExce197for Windows。方法:利用Excel的数据处理功能,进行药物的图表绘制、数据计算和统计处理,回归分析,特别是计算分析,并可建立分析数据库。结果和结论:Excel操作简单,功能强大,数据分析工作直观。 相似文献
57.
目的:比较国产辛伐他汀与进口辛伐他汀治疗原发性高胆固醇血症的疗效及安全性。方法:采用开放区组随机对照、多中心的临床设计。150例高胆 固醇血症病人分为验证组(50例)、对照组(48例)和开放组(52例),剂量均为每晚顿服10mg,服药8周。结果:验证组与对照组服药前后比较,血清总胆 固醇(TC)分别降低26.36%和28.3%,低密度脂蛋白胆固醇(LDL-C)分别降低33.17%和35.51%;验 相似文献
58.
Diet and cancer prevention: the fiber first diet 总被引:3,自引:0,他引:3
Diet can play a major role in cancer prevention. The international
differences in cancer incidence are largely accounted for by lifestyle
practices that include nutrition, exercise, and alcohol and tobacco use.
About 50% of cancer incidence and 35% of cancer mortality in the U.S.,
represented by cancers of the breast, prostate, pancreas, ovary,
endometrium, and colon, are associated with Western dietary habits. Cancer
of the stomach, currently a major disease in the Far East, relates to
distinct, specific nutritional elements such as excessive salt intake. For
these cancers, information is available on possible initiating genotoxic
factors, promoting elements, and prophylactic agents. In general, the
typical diet in the United States contains low levels of the potent
carcinogenic agents, heterocyclic amines, formed during the cooking of
meats. It provides only about half the potent appropriate fiber intake and
is high in calories. About twice as many calories as would be desirable
come from fat, certain kinds of which enhance the development of cancers.
Other foods with functional properties, such as soy products and tea, can
be beneficial. To achieve reduction in risk of certain cancers, diet must
be optimized, primarily to reduce caloric intake and the fat component. The
latter should be 20% or less of total caloric intake and fiber should be
increased to 25- 35 g per day for adults. One approach to achieving these
goals is the Fiber First Diet, a diet designed around adequate fiber intake
from grains, especially cereals, vegetables, legumes, and fruits, which
thereby reduces both calorie and fat intake. Such dietary improvements will
not only reduce cancer and other chronic disease risks, but will contribute
to a healthy life to an advanced age. A corollary benefit is a lower cost
of medical care.
相似文献
59.
60.