全文获取类型
收费全文 | 10920篇 |
免费 | 681篇 |
国内免费 | 52篇 |
专业分类
耳鼻咽喉 | 173篇 |
儿科学 | 642篇 |
妇产科学 | 156篇 |
基础医学 | 1315篇 |
口腔科学 | 199篇 |
临床医学 | 864篇 |
内科学 | 2259篇 |
皮肤病学 | 218篇 |
神经病学 | 651篇 |
特种医学 | 235篇 |
外科学 | 1815篇 |
综合类 | 279篇 |
一般理论 | 6篇 |
预防医学 | 651篇 |
眼科学 | 336篇 |
药学 | 1054篇 |
1篇 | |
中国医学 | 60篇 |
肿瘤学 | 739篇 |
出版年
2023年 | 75篇 |
2022年 | 150篇 |
2021年 | 395篇 |
2020年 | 221篇 |
2019年 | 297篇 |
2018年 | 353篇 |
2017年 | 245篇 |
2016年 | 299篇 |
2015年 | 329篇 |
2014年 | 454篇 |
2013年 | 529篇 |
2012年 | 717篇 |
2011年 | 694篇 |
2010年 | 444篇 |
2009年 | 375篇 |
2008年 | 611篇 |
2007年 | 614篇 |
2006年 | 648篇 |
2005年 | 543篇 |
2004年 | 476篇 |
2003年 | 440篇 |
2002年 | 389篇 |
2001年 | 223篇 |
2000年 | 202篇 |
1999年 | 170篇 |
1998年 | 111篇 |
1997年 | 68篇 |
1996年 | 68篇 |
1995年 | 42篇 |
1994年 | 46篇 |
1993年 | 45篇 |
1992年 | 115篇 |
1991年 | 105篇 |
1990年 | 92篇 |
1989年 | 96篇 |
1988年 | 100篇 |
1987年 | 89篇 |
1986年 | 83篇 |
1985年 | 70篇 |
1984年 | 60篇 |
1983年 | 33篇 |
1980年 | 32篇 |
1979年 | 41篇 |
1977年 | 40篇 |
1975年 | 46篇 |
1974年 | 35篇 |
1973年 | 36篇 |
1972年 | 41篇 |
1971年 | 33篇 |
1970年 | 38篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Khalid Irshad Samuel Millar Raj Velu Allan W Reid Edward B Diethrich Donald B Reid 《Journal of endovascular therapy》2007,14(2):198-207
PURPOSE: To report early clinical experience with virtual histology intravascular ultrasound (VH IVUS) in carotid endoluminal repair. TECHNIQUE: A 2.9-F, 20-MHz catheter that utilizes computer software to demonstrate the histological components of arteriosclerotic plaque was evaluated during carotid angioplasty and stenting. VH IVUS images were created following a pullback through the carotid stenosis and produced a color-coded map of the different histological constituents of the disease (dark green: fibrous, yellow/green: fibrofatty, white: calcified, and red: necrotic lipid core plaque). CONCLUSION: VH IVUS produces a color-coded map of the different histological components of artery plaque. It has the potential to predict how the plaque is likely to behave at the moment of endoluminal treatment. 相似文献
22.
Ruma Pahwa Nita Khurana K Uma Chaturvedi Anoop Raj 《Indian journal of otolaryngology and head and neck surgery》2003,55(3):193-194
Neurilemmoma is usually soimry, benign tumour derived from schwan cells of the Sheaths of peripheral cranial or autonomie
nerves. In thehead and neck region it occurs most commonly in association with acoustic nerve within the skuil and is rely
fottnd in the oral cavity (1,2). We report here two cases of the iongue diagnosed on histopathohgy. 相似文献
23.
24.
Immune responses induced by two dose strengths of an yeast-derived recombinant hepatitis B vaccine in adolescents. 总被引:2,自引:0,他引:2
25.
26.
27.
V V Joshi A B Cantor G Altshuler E W Larkin J S Neill J J Shuster C T Holbrook F A Hayes R Nitschke M H Duncan 《Cancer》1992,69(8):2197-2211
Histologic sections (minimum of four sections per patient) from 211 patients with neuroblastoma were reviewed. The tumors were resected before therapy, which was standardized according to age and stage. Low mitotic rate (MR) (less than or equal to ten per ten high-power fields) and calcification emerged as the most significant prognostic features after statistical analysis by stepwise log-rank tests (P less than 0.0001 and P = 0.0065, respectively). Histologic Grades 1, 2, and 3 were defined on the basis of the presence of both, any one, or none of these two prognostic features, respectively (Grade 3 had absence of low MR, i.e., these tumors had high MR [greater than ten per ten high-power fields]). Statistically significant differences in survival were observed in the grades after adjusting for age and stage (P less than 0.001). The degree of differentiation, although significant by itself, was no longer significant after adjusting for the grades. Age groups (less than or equal to 1 versus greater than 1 year of age), which also emerged as an independent prognostic feature (P less than 0.001), were linked with the grades to define two risk groups as follows: (1) a low-risk (LR) group consisting of patients in both age groups with Grade 1 tumors and patients 1 year of age or younger with Grade 2 tumors and (2) a high-risk (HR) group consisting of patients older than 1 year of age with Grade 2 tumors and patients in both age groups with Grade 3 tumors. The difference in survival between LR (160 cases) and HR groups (51 cases) was statistically significant (P less than 0.001). Concordance between these LR and HR groups and the Shimada classification was observed in 84% of cases. The new histologic grading system has the following advantages: (1) use of familiar terminology and histologic features in the grading system and (2) relative ease of assessment because the degree of differentiation does not need to be determined. The grading system should be tested on a new data set with an appropriate histologic sample of similar size to confirm these results. 相似文献
28.
G W Blunn A B Joshi P A Lilley E Engelbrecht L Ryd L Lidgren K Hardinge E Nieder P S Walker 《Acta orthopaedica Scandinavica》1992,63(3):247-255
106 unicondylar knee replacement tibial components were retrieved and analyzed for the amount and type of polyethylene wear. Three different designs were retrieved which had essentially the same femorotibial conformity. Each design showed a characteristic failure pattern. The polyethylene of PCA tibial components showed serious delamination after only short durations, as a result of heat pressing. St Georg sledge prostheses showed some delamination after 4 years' duration due to sub-surface cracks which were initiated by fusion defects in the polyethylene; metal backing of the components did not affect delamination of this prosthesis. The Marmor designs showed the least wear, with shiny depressions and surface pitting; no delamination was observed in the Marmor prosthesis. Molecular weight determination by gel permeation chromatography and analysis of crystallinity using Fourier transformation infra-red spectroscopy demonstrated that St George polyethylene had higher molecular weight and crystallinity than Marmor polyethylene. In some of the components investigated, crystallinity and molecular weight of the polyethylene were reduced under the wear track when compared with the unworn polyethylene. Since fusion defects may cause delamination of polyethylene we urge manufacturers to reduce the number of such defects. 相似文献
29.
Dhawan Subhash; Puri Raj K.; Kumar Ashok; Duplan Helen; Masson Jean-Michel; Aggarwal Bharat B. 《Blood》1997,90(4):1535-1544
30.
M. I. Khatkhatay M. P. Desai G. M. Sankolli D. K. Pardhe U. M. Joshi 《Journal of clinical laboratory analysis》1993,7(2):95-99
Penicillinase (β-lactamase) enzyme-linked immunosorbent assay (ELISA) for various reproductive hormones developed in the laboratory were found to have wide applicability in the fertility check clinic of the Institute. A need was thought to transform these assays into ready-to-use kit forms. Therefore, prototype ELISA kits for these hormones were developed and stability of the individual component was ascertained at various temperatures (room temperature, 37°C and 2-8°C). Stability studies were conducted on previously validated assay for pregnanediol-3α-glucuronide (PdG). The studies showed that immunosorbents (antibody coated plates) are stable at room temperature for a period of 2 weeks, at 37°C for 1 week and at 2-8°C for a period of 9 months when preserved after treatment with glycerol solution. The lyophilised conjugate, standard and immunoassay buffer, colour reagent, and its substrate were stable at 37°C up to 1 week and at room temperature up to 2 weeks and at 2-8°C for a period of 6 months, during which the stability was studied. © 1993 Wiley-Liss, Inc. 相似文献