全文获取类型
收费全文 | 1602229篇 |
免费 | 131518篇 |
国内免费 | 2582篇 |
专业分类
耳鼻咽喉 | 21655篇 |
儿科学 | 53005篇 |
妇产科学 | 46248篇 |
基础医学 | 227814篇 |
口腔科学 | 47233篇 |
临床医学 | 140946篇 |
内科学 | 314856篇 |
皮肤病学 | 34102篇 |
神经病学 | 130131篇 |
特种医学 | 64753篇 |
外国民族医学 | 474篇 |
外科学 | 243897篇 |
综合类 | 39724篇 |
现状与发展 | 3篇 |
一般理论 | 544篇 |
预防医学 | 122866篇 |
眼科学 | 36521篇 |
药学 | 121283篇 |
3篇 | |
中国医学 | 2975篇 |
肿瘤学 | 87296篇 |
出版年
2018年 | 14779篇 |
2016年 | 12913篇 |
2015年 | 15045篇 |
2014年 | 20672篇 |
2013年 | 31393篇 |
2012年 | 42615篇 |
2011年 | 44790篇 |
2010年 | 26359篇 |
2009年 | 25318篇 |
2008年 | 43031篇 |
2007年 | 45270篇 |
2006年 | 46092篇 |
2005年 | 44717篇 |
2004年 | 44124篇 |
2003年 | 42203篇 |
2002年 | 41305篇 |
2001年 | 75695篇 |
2000年 | 78339篇 |
1999年 | 66401篇 |
1998年 | 17732篇 |
1997年 | 16336篇 |
1996年 | 16318篇 |
1995年 | 16021篇 |
1994年 | 15070篇 |
1993年 | 14217篇 |
1992年 | 55428篇 |
1991年 | 53778篇 |
1990年 | 52561篇 |
1989年 | 50832篇 |
1988年 | 47221篇 |
1987年 | 46560篇 |
1986年 | 44284篇 |
1985年 | 42843篇 |
1984年 | 32033篇 |
1983年 | 27565篇 |
1982年 | 16144篇 |
1981年 | 14437篇 |
1980年 | 13564篇 |
1979年 | 30460篇 |
1978年 | 21064篇 |
1977年 | 17764篇 |
1976年 | 16694篇 |
1975年 | 17576篇 |
1974年 | 21486篇 |
1973年 | 20672篇 |
1972年 | 18853篇 |
1971年 | 17771篇 |
1970年 | 16289篇 |
1969年 | 15268篇 |
1968年 | 13949篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
91.
Henk R Franke F Froukje Snaaijer Paul W H Houben Marius J van der Mooren 《Gynecological endocrinology》2006,22(12):692-697
OBJECTIVE: To assess the effects of adding combined estradiol/norethisterone acetate therapy (CENT) to goserelin acetate treatment (GA) of dysfunctional uterine bleeding (DUB) in perimenopausal women. METHODS: In a randomized, placebo-controlled, double-blind trial followed by an open follow-up study, 31 perimenopausal women with DUB were recruited from gynecological outpatient departments of two Dutch hospitals and randomized for treatment with either GA/placebo or GA/CENT for 6 months followed by 18 months of GA/CENT for all. The main outcome measures were abdominal pain, number of bleeding days, double-layer endometrial thickness (DET), Greene climacteric score (GCS), visual analog scale for well-being, bone mineral density (BMD) and mammographic density (BI-RAD score). RESULTS: Abdominal pain, number of bleeding days and DET decreased in both groups, the between-group difference in decrease not being statistically significant. GCS initially showed significant improvement in the GA/CENT group. BMD decreased significantly in the GA/placebo group (-4.1%) compared with the GA/CENT group (-0.3%). Another 18 months of GA/CENT did not result in a lasting difference in BMD between groups. BI-RAD scores did not differ significantly between or within the two groups. CONCLUSIONS: Adding CENT to GA treatment for DUB in perimenopausal women initially prevented BMD loss and improved climacteric complaints, while having no negative impact on vaginal bleeding, abdominal pain or BI-RAD scores. However, prolonged treatment did not result in a lasting prevention of bone loss. 相似文献
92.
M. RAUVALA K. AGLUND† U. PUISTOLA T. TURPEENNIEMI-HUJANEN‡ G. HORVATH§ R. WILLÉN & U. STENDAHL† 《International journal of gynecological cancer》2006,16(3):1297-1302
The incidence of uterine cervical cancer has increased slightly in Western countries, with an increase in relatively young women. Overexpression of matrix metalloproteinases (MMPs)-2 and -9 has turned out as a prognostic factor in many cancers. We compared the expression of the proteins MMP-2 and MMP-9 in cervical primary tumors with clinical outcome and risk factors of cervical cancer. One hundred sixty-one patients with cervical cancer treated in Ume? University Hospital or Sahlgrenska University Hospital, Sweden, between 1991 and 1995 were included in the study. Paraffin-embedded tissue samples obtained prior to treatment were examined immunohistochemically by specific antibodies for MMP-2 and MMP-9. Forty-two percent of the tumors were intensively positive for MMP-2 and 31% for MMP-9. Nineteen percent of the samples were intensively positive for both proteinases and 47% negative or weak for both. Overexpression of MMP-2 seemed to predict unfavorable survival under Kaplan-Meier analysis and in the multivariate analysis. Early sexual activity and low parity seemed to correlate to overexpression of MMP-2. MMP-9 was not associated with survival or sexual behavior. Intensive MMP-9 was noted in grade 1 tumors. We conclude that MMP-2 and MMP-9 have different roles in uterine cervical cancer. MMP-2 could be associated with aggressive behavior, but MMP-9 expression diminishes in high-grade tumors. 相似文献
93.
94.
95.
96.
R. R. Reinert 《Clinical microbiology and infection》2006,12(9):942-943
97.
Andrea R Genazzani Hermann P G Schneider Nick Panay Esme A Nijland 《Gynecological endocrinology》2006,22(7):369-375
OBJECTIVES: To identify and describe current women's thoughts about the menopause, hormone treatment (HT) and perceptions about breast cancer. METHODS: Between December 2004 and January 2005, 4201 postmenopausal women in seven European countries were interviewed via a standardized computer-aided telephone interview protocol. RESULTS: Almost all women reported to have experienced climacteric symptoms, and 63% of the women rated them as being severe. Only 52% of women were aware of the benefits of HT for relief of climacteric symptoms. Although 84% felt that severe symptoms should be treated, only 40% had used HT at some point in time. Thirty-four percent of the women preferring treatment with natural products did so because of the risk of breast cancer associated with HT. HT was recognized by 59% of the women as one of the most important contributors to an increased breast cancer risk. Most women received their information about HT and breast cancer risk from the media. CONCLUSIONS: This European survey reveals that the majority of women experience climacteric symptoms but that their decision whether or not to use HT is highly dependent on their concern about breast cancer risk. An increase in knowledge of the benefits and risks of HT is required for women to make appropriate decisions about hormone use. 相似文献
98.
Thomas R?mer 《Gynecological endocrinology》2006,22(3):140-144
Bleeding disorders encountered during administration of hormone replacement therapy (HRT) are reviewed. The incidence of bleeding disorders is dependent on the phase of HRT and the age of the patient. In the diagnosis of these bleedings transvaginal sonography and minihysteroscopy are very important methods. Endometrial thickness can be monitored exactly by transvaginal sonography. Outpatient minihysteroscopy without anesthesia results in higher compliance to HRT after the procedure. In hormonal treatment of bleeding disorders during HRT, the sonographically supported progestogen test is very useful and can reduce endometrium thickness. Operative treatments include myoma and polyp resection as well as endometrial ablation. By these methods a high rate of bleeding-free HRT can be reached. The problem of endometrial cancer during HRT is discussed on the basis of new literature and critical statements. The review shows the importance of individual diagnostic and treatment schedules for bleeding disorders during HRT. 相似文献
99.
C.A. AMEZCUA H.R. MACDONALD† C.A. LUM W. YI‡ L.I. MUDERSPACH† L.D. ROMAN† & J.C. FELIX† 《International journal of gynecological cancer》2006,16(3):1336-1341
In this study, we examine the prevalence of finding isolated tumor cells (ITCs) in negative lymph nodes of endometrial cancer patients using immunohistochemistry. Seventy-six endometrial cancer patients with lymph nodes histologically negative for metastatic disease were examined. Nodal tissue sections were stained with anticytokeratin antibodies AE-1 and CAM 5.2. Nodes with single or groups of cells (two to four cells) < or =0.2 mm and showing cytokeratin reactivity were positive for ITCs. Findings were compared to features of the primary tumor and patient outcome. ITCs were present in 31 of 1712 lymph nodes. Fifteen (19.7%) patients had ITC-positive nodes. ITCs involved only pelvic nodes in nine cases, only para-aortic nodes in five cases, and pelvic and para-aortic in one case. Tumor in adnexa was the only pathologic feature associated with nodal ITCs (P= 0.0485). All 15 patients with nodal ITCs were alive at follow-up. One (6.7%) patient suffered recurrent disease but was alive at last encounter. Disease recurred in 5 (8.8%) of 57 patients without nodal ITCs. Two are alive without disease, two alive with disease, and one died from her cancer. In summary, a significant proportion of endometrial cancer patients have ITCs detected by immunohistochemistry in histologically negative regional lymph nodes. 相似文献
100.