全文获取类型
收费全文 | 4193篇 |
免费 | 425篇 |
国内免费 | 267篇 |
专业分类
耳鼻咽喉 | 25篇 |
儿科学 | 115篇 |
妇产科学 | 66篇 |
基础医学 | 448篇 |
口腔科学 | 65篇 |
临床医学 | 503篇 |
内科学 | 767篇 |
皮肤病学 | 84篇 |
神经病学 | 206篇 |
特种医学 | 422篇 |
外国民族医学 | 3篇 |
外科学 | 319篇 |
综合类 | 416篇 |
预防医学 | 299篇 |
眼科学 | 128篇 |
药学 | 474篇 |
6篇 | |
中国医学 | 179篇 |
肿瘤学 | 360篇 |
出版年
2024年 | 10篇 |
2023年 | 44篇 |
2022年 | 100篇 |
2021年 | 176篇 |
2020年 | 114篇 |
2019年 | 122篇 |
2018年 | 139篇 |
2017年 | 84篇 |
2016年 | 130篇 |
2015年 | 172篇 |
2014年 | 192篇 |
2013年 | 189篇 |
2012年 | 219篇 |
2011年 | 268篇 |
2010年 | 209篇 |
2009年 | 178篇 |
2008年 | 189篇 |
2007年 | 209篇 |
2006年 | 185篇 |
2005年 | 200篇 |
2004年 | 124篇 |
2003年 | 101篇 |
2002年 | 85篇 |
2001年 | 76篇 |
2000年 | 87篇 |
1999年 | 69篇 |
1998年 | 131篇 |
1997年 | 123篇 |
1996年 | 133篇 |
1995年 | 88篇 |
1994年 | 87篇 |
1993年 | 82篇 |
1992年 | 29篇 |
1991年 | 43篇 |
1990年 | 40篇 |
1989年 | 54篇 |
1988年 | 50篇 |
1987年 | 61篇 |
1986年 | 39篇 |
1985年 | 47篇 |
1984年 | 21篇 |
1983年 | 19篇 |
1982年 | 26篇 |
1981年 | 20篇 |
1980年 | 32篇 |
1979年 | 10篇 |
1978年 | 12篇 |
1977年 | 17篇 |
1976年 | 26篇 |
1975年 | 15篇 |
排序方式: 共有4885条查询结果,搜索用时 218 毫秒
11.
12.
13.
14.
15.
16.
(吴永平)(车东媛)(张婉蓉),(李文英)RoleofthePericytesofIntra-acinarPulmonaryArteryintheStructuralRemodelingofPulmonaryVessels¥WUYong-ping;C... 相似文献
17.
Comparison of p53 expression in proximal and distal gastric cancer: Histopathologic correlation and prognostic significance 总被引:2,自引:0,他引:2
Huihuan Tang MD Shuichi Hokita MD PhD Xiangming Che MD Masamichi Baba MD PhD Kuniaki Aridome MD PhD Fumio Kijima MD Gen Tanabe MD PhD Sonshin Takao MD PhD Dr. Takashi Aikou MD PhD 《Annals of surgical oncology》1997,4(6):470-474
Background: The overexpression of p53 has been found to be correlated with prognosis of some carcinomas, including gastric cancer, but
no studies have reported on its relationship to the location of gastric cancer. In the present study, we compared the p53
expression of proximal and distal gastric cancer concerning histopathology and prognosis.
Methods: A total of 170 tumors in the patients with proximal (80 cases) and distal (90 cases) gastric cancer were studied by immunohistochemical
methods.
Results: p53 immunopositivity was detected in 28.8% of all tumors. The p53-positive expression in proximal gastric cancer was higher
than in distal gastric cancer (38.8% vs. 20.0%, p<0.05). A 5-year survival analysis showed that there is no significant difference
between tumors that are p53 positive and p53 negative. No correlation was found between p53 expression and histopathology
of gastric cancer.
Conclusion: p53 nuclear staining is not useful as a prognostic indicator or as a parameter in gastric cancer. 相似文献
18.
Pernes JM; Vitoux JF; Brenoit P; Raynaud A; Parola JL; Roth JP; Angel CY; Fiessinger JN; Roncato M; Gaux JC 《Radiology》1986,158(2):481-485
Thirty-five patients hospitalized for recent angiographically documented arterial occlusion in the legs (27 femoropopliteal arteries and eight grafts) benefited from local fibrinolytic therapy delivered at the site of the occlusion with a 4- or 5-F catheter. This therapy combined a continuous urokinase (UK) infusion of 1,000 U/kg/hour and a lysyl plasminogen (LYS-PLG) infusion of 15 microkatals every 30 minutes. Angiographically confirmed lysis was obtained in 85% of the cases. Only 3% of the patients had major and 6% had minor groin hematomas. Only two patients had concentrations of fibrinogen as low as 100 mg/dl. Intravascular infusion of UK-LYS-PLG is as effective as streptokinase. Its excellent tolerance makes it a good alternative in the treatment of acute ischemia in the lower limbs. 相似文献
19.
Short-Ti inversion-recovery pulse sequence: analysis and initial experience in cancer imaging 总被引:2,自引:0,他引:2
Inversion recovery (IR), commonly considered a pulse sequence capable of producing T1-weighted images with excellent display of normal anatomy, is versatile: The null point and peak time provide a useful, succinct summary of the properties of IR and its capacity for producing both T1- and T2-weighted images. Shortening of the inversion time (TI) and creation of a short-TI inversion-recovery (STIR) pulse sequence increases sensitivity to malignancy and other abnormalities by making the effects of prolonged T1 and T2 on signal intensity additive and by nulling the signal from fat. The authors examined over 300 patients with various malignancies and compared STIR images with T1- and T2-weighted images obtained at 0.5 T. In 43 cases, signal-difference-to-noise ratios (SD/Ns) were calculated between tumor, fat, and muscle. In general, STIR images demonstrated tumor as a conspicuously high-intensity area in a background of muted, discernible anatomic detail. The good contrast achieved with STIR sequences between tumor and fat (SD/N = 18.1) and tumor and muscle (SD/N = 12.9) consolidated into a single image the information contained separately on T1- and T2-weighted images, which facilitates efficient detection and localization of malignancy. 相似文献
20.
作者于1987年2月16日~1988年2月15日在四川五个点211 639人群中监测急性病毒性肝炎。其发病率为167.74/10万,其中甲型肝炎占24.51%;乙型肝炎占38.31%;非甲非乙型肝炎占24.51%,EB病毒和巨细胞病毒所致肝炎各占3.38%;混合感染占5.92%。病毒性肝炎中有14.93%重叠感染。发病高峰在春季。发病率,男:女=1.75:1。甲型肝炎20岁以下年龄组、乙型肝炎20~39岁年龄组的发病率明显高于其他年龄组,非甲非乙型较分散,5~19岁相对多一些,其他型别年龄组间无明显差异。355例急性病毒性肝炎患者中43.9%有接触史,36.6%有注射史。 相似文献