全文获取类型
收费全文 | 4107篇 |
免费 | 226篇 |
国内免费 | 12篇 |
专业分类
耳鼻咽喉 | 84篇 |
儿科学 | 157篇 |
妇产科学 | 61篇 |
基础医学 | 507篇 |
口腔科学 | 62篇 |
临床医学 | 249篇 |
内科学 | 1032篇 |
皮肤病学 | 76篇 |
神经病学 | 404篇 |
特种医学 | 110篇 |
外国民族医学 | 1篇 |
外科学 | 615篇 |
综合类 | 19篇 |
预防医学 | 411篇 |
眼科学 | 49篇 |
药学 | 275篇 |
中国医学 | 20篇 |
肿瘤学 | 213篇 |
出版年
2023年 | 16篇 |
2022年 | 21篇 |
2021年 | 95篇 |
2020年 | 34篇 |
2019年 | 101篇 |
2018年 | 136篇 |
2017年 | 80篇 |
2016年 | 61篇 |
2015年 | 67篇 |
2014年 | 103篇 |
2013年 | 141篇 |
2012年 | 253篇 |
2011年 | 289篇 |
2010年 | 135篇 |
2009年 | 118篇 |
2008年 | 233篇 |
2007年 | 237篇 |
2006年 | 242篇 |
2005年 | 243篇 |
2004年 | 233篇 |
2003年 | 193篇 |
2002年 | 202篇 |
2001年 | 148篇 |
2000年 | 185篇 |
1999年 | 141篇 |
1998年 | 25篇 |
1997年 | 24篇 |
1996年 | 15篇 |
1995年 | 14篇 |
1994年 | 14篇 |
1992年 | 60篇 |
1991年 | 48篇 |
1990年 | 40篇 |
1989年 | 42篇 |
1988年 | 30篇 |
1987年 | 31篇 |
1986年 | 39篇 |
1985年 | 27篇 |
1984年 | 19篇 |
1983年 | 18篇 |
1982年 | 11篇 |
1979年 | 24篇 |
1978年 | 12篇 |
1977年 | 11篇 |
1975年 | 12篇 |
1974年 | 15篇 |
1973年 | 12篇 |
1971年 | 13篇 |
1970年 | 9篇 |
1968年 | 10篇 |
排序方式: 共有4345条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
Silvia Ciairano Silvia Bonino Wendy Kliewer Renato Miceli Sandy Jackson 《Journal of clinical child and adolescent psychology》2006,35(2):275-282
Associations among dating, sexual activity, gender, and adjustment were investigated in 2,273 Italian adolescents (54% female, ages 14 to 19 years) attending public high schools. After controlling for age and type of school attended, both being in a dating relationship and being male were associated with less alienation, more positive views of the self, and higher general expectations for success. Sexual activity interacted with both gender and dating status in predicting feelings of depression. For boys, there were no differences between youth who were sexually active and youth who were not; however, sexually active girls had higher levels of depressive symptoms than girls who were not sexually active. Among youth who were not sexually active, there were small differences between daters and nondaters; among sexually active youth, daters had lower levels of depression than nondaters. Gender differences in adolescents' experience of dating and sexual relationships and implications for adjustment are discussed. 相似文献
5.
6.
The use of decision analysis in selecting a histamine H2-receptor antagonist for the formulary at a hospital in Spain is described. Cimetidine, ranitidine, and famotidine were identified as the possible alternatives. The evaluation criteria established were therapeutic efficacy, adverse effects, drug interactions, years of clinical use, dosage interval, cost, and dosage forms. The relative importance of the criteria was determined by assigning utility values to each. Probability values were assigned to estimate how well each drug met each criterion. By multiplying the utility and probability values for each criterion and summing the scores, a total score was calculated for each drug. The alternative with the highest total score was ranitidine. A sensitivity analysis showed that the results were stable over a plausible range of probability and utility values. Accordingly, ranitidine was selected for inclusion on the formulary. Decision analysis provided an effective method for selecting which histamine H2-receptor antagonist to include on the hospital's formulary. 相似文献
7.
8.
Emilio Bombardieri Antonia Martinetti Rosalba Miceli Luigi Mariani Maria Rita Castellani Ettore Seregni 《European journal of nuclear medicine and molecular imaging》1997,24(11):1349-1355
Bone scintigraphy plays a major role in the diagnosis of bone metastases. The clinical utility of new biochemical markers
of bone metabolism has recently been investigated in various bone diseases. This study evaluated the role of some bone metabolism
markers in comparison with bone scan in the follow-up of breast cancer patients. We studied 149 patients with breast cancer,
33 (22%) of whom had bone metastases. IRMAs were used for the evaluation of blood levels of osteocalcin, bone alkaline phosphatase
(BAP), the C-terminal propeptide of type I procollagen and the C-terminal cross-linked telopeptide of type I collagen (ICTP).
Multivariate regression analysis showed that menopausal status (P=0.007) and metastatic bone lesions (P=0.001) affected bone marker levels. When considering post-menopausal women, the only subset in which bone metabolism marker
behaviour could be reliably investigated, we found a high degree of overlap in marker distribution for scan-positive and scan-negative
patients. Discrimination between scan-negative and scan-positive patients based on the above markers, taken singly or jointly,
was assessed by means of logistic discriminant analysis. The best discrimination was achieved with BAP, closely followed by
ICTP. BAP and ICTP together gave a slight improvement over the use of the two markers separately. However, even in this case
the degree of discrimination was poor and its clinical utility was limited. In fact, to achieve a specificity of 95%, the
sensitivity of the test was about 20%; conversely, with a sensitivity of 95%, the specificity was below 10%. In conclusion,
based on our findings, we believe that blood levels of the investigated markers cannot replace bone scintigraphy in the follow-up
of breast cancer patients for the early detection of bone metastases.
Received 14 April and in revised form 5 July 1997 相似文献
9.
J Martín de Pablos M Santano Domínguez A Blanco Yun J Sánchez Calero 《Revista española de enfermedades digestivas》1992,82(3):189-191
We report a case of a primary gastric Burkitt's lymphoma in a 8-year-old child, which first symptoms were abdominal pain, dysphagia, melena and a constitutional syndrome. The differential characteristics of this case are its peculiar gastric infiltration and the existence of oesophageal extension, which is very infrequent among this kind of tumors. 相似文献
10.