全文获取类型
收费全文 | 2562486篇 |
免费 | 190134篇 |
国内免费 | 4057篇 |
专业分类
耳鼻咽喉 | 35761篇 |
儿科学 | 83046篇 |
妇产科学 | 71439篇 |
基础医学 | 364049篇 |
口腔科学 | 76052篇 |
临床医学 | 223636篇 |
内科学 | 496065篇 |
皮肤病学 | 56830篇 |
神经病学 | 202690篇 |
特种医学 | 100523篇 |
外国民族医学 | 666篇 |
外科学 | 384834篇 |
综合类 | 57266篇 |
现状与发展 | 4篇 |
一般理论 | 796篇 |
预防医学 | 198302篇 |
眼科学 | 59901篇 |
药学 | 198007篇 |
10篇 | |
中国医学 | 5637篇 |
肿瘤学 | 141163篇 |
出版年
2018年 | 27666篇 |
2017年 | 21106篇 |
2016年 | 23304篇 |
2015年 | 26526篇 |
2014年 | 35682篇 |
2013年 | 53719篇 |
2012年 | 74836篇 |
2011年 | 78985篇 |
2010年 | 45844篇 |
2009年 | 42535篇 |
2008年 | 73797篇 |
2007年 | 78153篇 |
2006年 | 79106篇 |
2005年 | 76230篇 |
2004年 | 73993篇 |
2003年 | 70662篇 |
2002年 | 68731篇 |
2001年 | 122759篇 |
2000年 | 127020篇 |
1999年 | 106687篇 |
1998年 | 28116篇 |
1997年 | 25023篇 |
1996年 | 24905篇 |
1995年 | 24000篇 |
1994年 | 22212篇 |
1993年 | 20956篇 |
1992年 | 84651篇 |
1991年 | 81820篇 |
1990年 | 80359篇 |
1989年 | 77566篇 |
1988年 | 71518篇 |
1987年 | 70195篇 |
1986年 | 66678篇 |
1985年 | 63956篇 |
1984年 | 47189篇 |
1983年 | 40490篇 |
1982年 | 23220篇 |
1981年 | 20532篇 |
1979年 | 44466篇 |
1978年 | 30548篇 |
1977年 | 26363篇 |
1976年 | 24142篇 |
1975年 | 26266篇 |
1974年 | 31658篇 |
1973年 | 30572篇 |
1972年 | 28555篇 |
1971年 | 26910篇 |
1970年 | 24703篇 |
1969年 | 23545篇 |
1968年 | 21468篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Vilar-Compte Mireya Gaitán-Rossi Pablo Félix-Beltrán Lucía Bustamante Arturo V. 《Journal of immigrant and minority health / Center for Minority Public Health》2022,24(1):65-77
Journal of Immigrant and Minority Health - COVID-19 has disproportionally affected underrepresented minorities (URM) and low-income immigrants in the United States. The aim of the study is to... 相似文献
22.
23.
24.
Malunguja Gisandu K. Devi Ashalata 《Proceedings of the National Academy of Sciences, India. Section B.》2022,92(1):105-120
Proceedings of the National Academy of Sciences, India Section B: Biological Sciences - Heavy metal concentrations in surface soils of Reserved Forests (RFs) have a significant impact on... 相似文献
25.
Purnima Gogoi Geetika Kaur Nikhlesh K Singh 《World journal of gastroenterology : WJG》2022,28(46):6497-6511
Colorectal cancer (CRC) is the third most diagnosed cancer and the second leading cause of cancer-related mortality in the United States. Across the globe, people in the age group older than 50 are at a higher risk of CRC. Genetic and environmental risk factors play a significant role in the development of CRC. If detected early, CRC is preventable and treatable. Currently, available screening methods and therapies for CRC treatment reduce the incidence rate among the population, but the micrometastasis of cancer may lead to recurrence. Therefore, the challenge is to develop an alternative therapy to overcome this complication. Nanotechnology plays a vital role in cancer treatment and offers targeted chemotherapies directly and selectively to cancer cells, with enhanced therapeutic efficacy. Additionally, nanotechnology elevates the chances of patient survival in comparison to traditional chemotherapies. The potential of nanoparticles includes that they may be used simultaneously for diagnosis and treatment. These exciting properties of nanoparticles have enticed researchers worldwide to unveil their use in early CRC detection and as effective treatment. This review discusses contemporary methods of CRC screening and therapies for CRC treatment, while the primary focus is on the theranostic approach of nanotechnology in CRC treatment and its prospects. In addition, this review aims to provide knowledge on the advancement of nanotechnology in CRC and as a starting point for researchers to think about new therapeutic approaches using nanotechnology. 相似文献
26.
27.
Tengzhi Liu Kathrine Røe Redalen Morten Karlsen 《Journal of labelled compounds & radiopharmaceuticals》2022,65(7):191-202
Cyclotron-produced copper-64 radioisotope tracers offer the possibility to perform both diagnostic investigation by positron emission tomography (PET) and radiotherapy by a theranostic approach with bifunctional chelators. The versatile chemical properties of copper add to the importance of this isotope in medicinal investigation. [64Cu][Cu (ATSM)] has shown to be a viable candidate for imaging of tumor hypoxia; a critical tumor microenvironment characteristic that typically signifies tumor progression and resistance to chemo-radiotherapy. Various production and radiosynthesis methods of [64Cu][Cu (ATSM)] exist in labs, but usually involved non-standardized equipment with varying production qualities and may not be easily implemented in wider hospital settings. [64Cu][Cu (ATSM)] was synthesized on a modified GE TRACERlab FXN automated synthesis module. End-of-synthesis (EOS) molar activity of [64Cu][Cu (ATSM)] was 2.2–5.5 Ci/μmol (HPLC), 2.2–2.6 Ci/μmol (ATSM-titration), and 3.0–4.4 Ci/μmol (ICP-MS). Radiochemical purity was determined to be >99% based on radio-HPLC. The final product maintained radiochemical purity after 20 h. We demonstrated a simple and feasible process development and quality control protocols for automated cyclotron production and synthesis of [64Cu][Cu (ATSM)] based on commercially distributed standardized synthesis modules suitable for PET imaging and theranostic studies. 相似文献
28.
29.
Esin Benli Küçük Ercan Kaydok Kürsad Ramazan Zor Gamze Yıldırım Biçer 《Topics in stroke rehabilitation》2020,27(8):630-635
ABSTRACT Objective: Dry eye is reported to be associated with several neurological diseases. The aim of this study is to evaluate the patients with hemiplegia after stroke for dry eye and compare their results with a control group. Materials and methods: Forty-five patients with hemiplegia and 45 individuals as the control group were included in the study. Tear function tests (Schirmer and tear breakup time) and a dry eye questionnaire for dry eye symptoms (ocular surface disease index) were performed and the results of the two groups were compared. Results: Schirmer test results were significantly lower in the post-stroke hemiplegia group compared to the control group (11.3 ± 8.2 mm and 20.6 ± 11.6 mm, respectively, p < .001). Tear breakup time results were significantly lower in the post-stroke hemiplegia group compared to the control group (7.9 ± 3.1 s and 12.1 ± 4.3 s, respectively, p < .001). Ocular surface disease index scores were not significantly different between hemiplegia and control groups (21.6 ± 20.0 and 19.8 ± 13.9, respectively, p = .635). Schirmer scores lower than 10 mm (60% and 30%, p < .001) and tear breakup time results lower than 10 s (65.6% and 28.9%, p < .001) were also higher in the hemiplegia group compared to control group. Conclusion: We found lower Schirmer test and tear breakup time results and similar OSDI scores in hemiplegia patients compared to controls. Hemiplegia patients may have dry eye without typical symptoms. This should be taken into consideration in the follow-up and rehabilitation of post-stroke hemiplegia patients. 相似文献
30.