全文获取类型
收费全文 | 26142篇 |
免费 | 1399篇 |
国内免费 | 57篇 |
专业分类
耳鼻咽喉 | 409篇 |
儿科学 | 1103篇 |
妇产科学 | 870篇 |
基础医学 | 4229篇 |
口腔科学 | 579篇 |
临床医学 | 2134篇 |
内科学 | 5193篇 |
皮肤病学 | 533篇 |
神经病学 | 2576篇 |
特种医学 | 1063篇 |
外国民族医学 | 14篇 |
外科学 | 3770篇 |
综合类 | 117篇 |
一般理论 | 3篇 |
预防医学 | 1367篇 |
眼科学 | 501篇 |
药学 | 1358篇 |
中国医学 | 19篇 |
肿瘤学 | 1760篇 |
出版年
2022年 | 211篇 |
2021年 | 357篇 |
2020年 | 236篇 |
2019年 | 324篇 |
2018年 | 414篇 |
2017年 | 347篇 |
2016年 | 486篇 |
2015年 | 470篇 |
2014年 | 639篇 |
2013年 | 820篇 |
2012年 | 1180篇 |
2011年 | 1256篇 |
2010年 | 619篇 |
2009年 | 673篇 |
2008年 | 1146篇 |
2007年 | 1233篇 |
2006年 | 1153篇 |
2005年 | 1178篇 |
2004年 | 980篇 |
2003年 | 977篇 |
2002年 | 901篇 |
2001年 | 902篇 |
2000年 | 932篇 |
1999年 | 786篇 |
1998年 | 343篇 |
1997年 | 266篇 |
1996年 | 218篇 |
1995年 | 201篇 |
1994年 | 180篇 |
1993年 | 178篇 |
1992年 | 480篇 |
1991年 | 507篇 |
1990年 | 488篇 |
1989年 | 405篇 |
1988年 | 384篇 |
1987年 | 401篇 |
1986年 | 391篇 |
1985年 | 388篇 |
1984年 | 270篇 |
1983年 | 211篇 |
1982年 | 137篇 |
1981年 | 143篇 |
1979年 | 260篇 |
1978年 | 183篇 |
1977年 | 154篇 |
1976年 | 152篇 |
1975年 | 164篇 |
1974年 | 192篇 |
1973年 | 167篇 |
1972年 | 154篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
Setting goals to maintain hope. 总被引:3,自引:0,他引:3
3.
杨娅 Thomas Bartel Loredana Latina Guido Caspari 王新房 Raimund Erbel 《华中科技大学学报(医学英德文版)》2002,22(2):158-163
Coronary flow reserve (CFR) has been used toassess coronary microcirculation and epicardial coro-nary stenoses[1— 3 ] . CFR is defined as the ratio ofcoronary flow under maximal coronary vasodilatationto coronary flow under resting conditions[4 ] .Whenthe cross- sectional area of epicardial coronary arteriesis constant,coronary flow velocity (CFV) ratios areequal to volume flow ratios.The most common method used clinically formeasuring CFVR is intracoronary Doppler flow(ICD) analysis re… 相似文献
4.
Ten years experience with acute peritoneal dialysis in 39 preterm-, newborn and small infants shows advantage and low risk of surgically implanted single dacron cuffed silicone catheters compared to trocar catheters. 相似文献
5.
Uptake of Adriamycin in tumour and surrounding brain tissue in patients with malignant gliomas 总被引:1,自引:0,他引:1
H. von Holst E. Knochenhauer H. Blomgren V. P. Collins L. Ehn M. Lindquist G. Norén C. Peterson 《Acta neurochirurgica》1990,104(1-2):13-16
Summary Eight patients with malignant gliomas verified on CT scan, received an intravenous injection of 50 mg of Adriamycin R, 24 hours prior to surgical removal of the tumour. Peroperatively, both tumour and surrounding tissue specimens were obtained for determination of the tissue concentrations of Adriamycin and its reduced metabolite Adriamycinol. It was found that Adriamycin could be detected in tumour tissue from all patients. The concentration varied between 0,9 and 4,6 nmol/g tissue. In contrast, Adriamycin could only be detected in surrounding brain tissue from one patient.In anin vitro study a human malignant glioma cell line (U-251 MG) was exposed to various concentrations of Adriamycin for 24 hours. It was found that an intracellular drug concentration above 30 nmol/g cells caused a concentration dependent inhibition of cell growth. Thus, it is likely that the poor effect of Adriamycin on patients with malignant gliomas is due to an ineffective drug accumulation in the tumour tissue. 相似文献
6.
7.
I Immonen K Friberg C Gr?nhagen-Riska E von Willebrand F Fyhrquist 《Acta ophthalmologica》1986,64(5):519-521
Angiotensin-converting enzyme (ACE) was studied immunohistochemically in conjunctival biopsies from 6 patients with systemic sarcoidosis, 4 patients with posterior non-sarcoid uveitis and in specimens from 4 patients with chalazion of the eyelid. Specimens with sarcoid granulomas showed intense ACE-positive immunoreactivity in epitheloid cells of the granuloma, whereas chalazion granulomas did not contain ACE-immunoreactivity. There was no difference in staining patterns between specimens without granulomas. Thus immunohistochemical staining for ACE may be of help in differentiating conjunctival granulomatous tissue of a chalazion from sarcoid granuloma. 相似文献
8.
A case of testicular cancer in 2 brothers is reported and a review of the literature about testicular malignancies and etiologic factors in closely related family members is given. The familial incidence of testicular tumor is found to be 3% in twins and 0.6-2.1% in less closely related men. Tumors were of the same histology in 70-77% of the twins, whereas in brothers and in other degrees of relationship tumors of different histology mostly occur. Following the diagnosis of the tumor in the first man, the average interval to presentation of the tumor in the relative was 3.7 years in twins, 7.7 years in nontwin brothers and 13.5 years for less closely related men. The need for a thorough checkup of other family members is advised. 相似文献
9.
Dr. med. A. Schultze-Mosgau G. Griesinger S. von Otte K. Diedrich 《Gyn?kologische Endokrinologie》2005,3(4):219-225
Since the introduction of in vitro fertilization in 1978, reproductive medicine and its associated scientific fields have developed rapidly. In Germany, progress in this field is impeded by the German Embryo Protection Act. Exemplary are the prohibition of embryo selection and the ban on genetic testing of the pre-implantation embryo. Nevertheless, infertility treatment outcome has to be optimized within the framework of this law, with the aim of making treatment more efficient, lowering the incidence of multiple gestations, making ovarian hyperstimulation safer, as well as reducing the financial costs for the couple. 相似文献
10.
Adjuvant radiotherapy in carcinomas of the uterine cervix: the prognostic value of hemoglobin levels
K. Münstedt P. Johnson M.K. Bohlmann M. Zygmunt R. von Georgi† & H. Vahrson 《International journal of gynecological cancer》2005,15(2):285-291
Anemia has been associated with a poorer treatment response and reduced survival in women undergoing primary radiotherapy (RT) or radiochemotherapy for advanced cervical carcinoma. This study aimed to determine the influence of anemia on outcome in patients with cervical carcinoma undergoing adjuvant RT. Medical records were reviewed for 183 cervical cancer patients who had received adjuvant RT because of risk factors after radical surgery (n= 109) or inadequate primary surgery (simple hysterectomy; n= 74). Kaplan-Meier and Cox regression analyses were used to study hemoglobin levels before and during adjuvant RT in relation to recurrence-free and overall survival. Hemoglobin values > or =11 g/dL were considered normal, while those <11 g/dL indicated anemia. Hemoglobin levels before RT influenced significantly overall survival and recurrence-free survival across the whole group (overall survival--log rank(all patients)= 7.5; df = 1; P= 0.006). However, subgroup analysis showed that the observed difference was mainly due to the group of women who had undergone inadequate primary surgery (overall survival--log rank(inadequate surgery)= 10.8; df = 1; P= 0.001). Multifactorial regression analyses comparing hemoglobin before RT with grading and tumor stage confirmed the prognostic value of hemoglobin values. Maintaining normal hemoglobin values before and during adjuvant RT seems to be important, especially in patients who have had inappropriate simple hysterectomy, which may resemble a therapeutic situation. 相似文献