全文获取类型
收费全文 | 9513篇 |
免费 | 892篇 |
国内免费 | 68篇 |
专业分类
耳鼻咽喉 | 113篇 |
儿科学 | 282篇 |
妇产科学 | 455篇 |
基础医学 | 1127篇 |
口腔科学 | 214篇 |
临床医学 | 1059篇 |
内科学 | 2162篇 |
皮肤病学 | 137篇 |
神经病学 | 602篇 |
特种医学 | 313篇 |
外科学 | 1502篇 |
综合类 | 218篇 |
现状与发展 | 1篇 |
一般理论 | 1篇 |
预防医学 | 488篇 |
眼科学 | 176篇 |
药学 | 677篇 |
中国医学 | 86篇 |
肿瘤学 | 860篇 |
出版年
2023年 | 80篇 |
2022年 | 190篇 |
2021年 | 299篇 |
2020年 | 176篇 |
2019年 | 329篇 |
2018年 | 359篇 |
2017年 | 274篇 |
2016年 | 285篇 |
2015年 | 342篇 |
2014年 | 449篇 |
2013年 | 508篇 |
2012年 | 678篇 |
2011年 | 727篇 |
2010年 | 453篇 |
2009年 | 420篇 |
2008年 | 555篇 |
2007年 | 518篇 |
2006年 | 489篇 |
2005年 | 477篇 |
2004年 | 422篇 |
2003年 | 373篇 |
2002年 | 375篇 |
2001年 | 240篇 |
2000年 | 214篇 |
1999年 | 175篇 |
1998年 | 66篇 |
1997年 | 68篇 |
1996年 | 56篇 |
1995年 | 48篇 |
1994年 | 48篇 |
1993年 | 37篇 |
1992年 | 94篇 |
1991年 | 72篇 |
1990年 | 74篇 |
1989年 | 63篇 |
1988年 | 59篇 |
1987年 | 38篇 |
1986年 | 38篇 |
1985年 | 51篇 |
1984年 | 29篇 |
1983年 | 23篇 |
1982年 | 18篇 |
1981年 | 25篇 |
1980年 | 13篇 |
1979年 | 18篇 |
1977年 | 17篇 |
1976年 | 12篇 |
1975年 | 15篇 |
1973年 | 13篇 |
1972年 | 12篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
PNPLA3 gene polymorphism and response to lifestyle modification in patients with nonalcoholic fatty liver disease 下载免费PDF全文
3.
Matrine,oxymatrine, and compound Kushen injection from the roots of Sophora flavescens: an overview of their anticancer activities 下载免费PDF全文
In the present review, we updated current information on the chemistry, contents, and anticancer properties of matrine (MT), oxymatrine (OMT), and compound Kushen injection (CKI). The anticancer properties were focused on lung, breast, and liver cancer cells because they are most susceptible. Sources of information were from Google, Google Scholar, PubMed, PubMed Central, Science Direct, PubChem, J-Stage, Directory of Open Access Journals (DOAJ), and China National Knowledge Infrastructure (CNKI). Reference was also made on botanical websites, such as Flora of China and World Flora Online. MT and OMT are dominant quinolizidine alkaloids from the roots of Sophora flavescens (Kushen) of the family Fabaceae. Against lung, breast, and liver cancer cells, MT and OMT inhibit cell proliferation; induce cell cycle arrest, apoptosis, and autophagy; restrict angiogenesis; and inhibit cell metastasis, invasion, and migration. The processes involve various molecular targets and signaling pathways. CKI is a traditional Chinese medicine (TCM) composed of root extracts of S. flavescens and Smilax glabra (Baituling) of the family Smilacaceae. With MT and OMT as major components, CKI has been approved for the treatment of cancer in China more than 20 years ago. In recent years, systematic reviews and meta-analysis have been undertaken to evaluate the anticancer effects of CKI. When CKI is used alone and in combination with chemotherapy of western medicine, there is much to be learned concerning their interactions besides their individual and integrated efficacy. Some perspectives of MT, OMT, and CKI are discussed, and their suggestions for future research are provided. 相似文献
4.
Quang Ngoc Nguyen Linh Dieu Vuong Van-Long Truong To Van Ta Nam Trung Nguyen Hung Phi Nguyen Ha Hoang Chu 《Pathology, research and practice》2019,215(5):885-892
Genetic and epigenetic alterations importantly contribute to the pathogenesis of lung cancer. In the study, we measured the frequency and distribution of molecular abnormalities of EGFR as well as the aberrant promoter methylations of BRCA1, MGMT, MLH1, and RASSF1A in Vietnamese lung adenocarcinomas. We investigated the association between genetic and epigenetic alteration, and between each abnormality with clinicopathologic parameters. Somatic EGFR mutation that was found in 49/139 (35.3%) lung adenocarcinomas showed a significant association with young age, female gender, and non-smokers. EGFR overexpression was identified in 82 tumors (59.0%) and statistical relationships with EGFR or BRCA1 methylation but not EGFR mutation. In addition, EGFR, BRCA1, MGMT, MLH1, and RASSF1A methylations were found in 33 (23.7%), 41 (29.5%), 46 (33.1%), 28 (20.1%), and 41 (29.5%) cases of a total of 139 lung adenocarcinomas, respectively. The RASSF1A methylation was found to be linked to the smoking habit. Methylations in MGMT and RASSF1A were also found to correlate with metastasis status. Furthermore, the distribution of EGFR mutation and that of BRCA1, MGMT or RASSF1A methylation were significantly exclusive in lung adenocarcinomas. The main finding of our study demonstrate that epigenetic abnormalities might play a critical role for the lung tumorigenesis in patients with smoking history and metastasis, and partly affect the predictive value of EGFR mutations through blocking expression due to promoter EGFR hypermethylation. Mutually exclusive distribution of genetic and epigenetic alterations reflects differently biological characteristics in the etiology of lung adenocarcinomas. 相似文献
5.
6.
Bryan E.K. Guevara Suhail Saleem Wan‐Ting Chen Pa‐Fan Hsiao Yu‐Hung Wu 《Journal of cutaneous pathology》2019,46(5):347-352
Lucio phenomenon is an atypical reaction of leprosy, characterized by vasculitic lesions that can mimic antiphospholipid syndrome (APS) clinically. Distinguishing the two can be difficult as antiphospholipid autoantibodies may be present in patients with leprosy. We report on a 32‐year‐old female patient presenting with a sudden onset of fever, hemorrhagic bullae, and skin necrosis on her lower legs. She was treated for APS due to the presence of antiphospholipid antibodies but had an inadequate response. A skin biopsy revealed thrombotic vasculopathy and necrotizing vasculitis associated with aggregation of foam cells in the perivascular area and subcutis, with acid‐fast bacilli in the histiocytes and blood vessel walls. Direct immunofluorescence showed IgM, C3, and fibrinogen deposition in the superficial and deep dermal blood vessels. The pathology confirmed the diagnosis of Lucio phenomenon, and appropriate therapy was given. It is essential to evaluate the patient comprehensively, including clinical, serological, and pathological aspects, to obtain the correct diagnosis. 相似文献
7.
8.
Chi-Chih Hung Jinn-Yuh Guh Mei-Chuan Kuo Yung-Hsiung Lai Hung-Chun Chen 《Nephrology, dialysis, transplantation》2006,21(2):547-548
Sir, Aminoglycoside-induced renal tubular dysfunction could be dividedinto Fanconi-like syndrome (FS) and Bartter-like syndrome (BS)[1]. The risk factors and mechanisms of tubular dysfunctionare little known. Here, we report a case of gentamicin-inducedFS, BS and distal renal tubular acidosis (RTA) and propose thepossible involvement of mitochondria. Case. A 66-year-old Chinese male was admitted because ofpneumonia. 相似文献
9.
The spine, pelvic bones and long bones of the lower extremities are common sites for insufficiency fractures. Cases of sternum insufficiency fractures have been rarely reported in an elderly patient. Insufficiency fracture tends to occur in bones with decreased mechanical strength. It tends to occur in elderly patients, especially in postmenopausal women, with underlying diseases. We describe a case of sternum insufficiency fracture in a patient with rheumatoid arthritis and systemic lupus erythematosus on long-term corticosteroid therapy diagnosed in an emergency setting. Sternum insufficiency fracture is a rare cause of chest pain. This case serves to remind the emergency physician to remain vigilant for other noncardiac and nontraumatic causes of chest pain. If diagnosed accurately, these patients can be discharged and treated as outpatients. 相似文献
10.
The aim of this study was to design a new intravenous blood–gas exchange device and to estimate the design characteristics
of the device with a dimensionless function by using a substance that can be used instead of bovine blood. In addition, the
characteristics of oxygen transfer were estimated using empirical formulas and the reliability of the equations was ascertained
by comparing their output with an experiment performed using bovine blood. The dimensionless function was derived using distilled
water and bovine blood to estimate the oxygen transfer rate. Using the derived equations, the calculated oxygen transfer rates
for bovine blood and distilled water were similar for Reynolds numbers ranging from 0.7 to 7.0. Therefore, it is possible
to estimate the oxygen transfer rate in bovine blood, which is a non-Newtonian fluid, using distilled water, which is a Newtonian
fluid. Moreover, it was possible to verify the related equations because the oxygen transfer rate could be estimated using
the derived equations, according to the diameters of the various device modules. 相似文献