全文获取类型
收费全文 | 24209篇 |
免费 | 1965篇 |
国内免费 | 1131篇 |
专业分类
耳鼻咽喉 | 239篇 |
儿科学 | 130篇 |
妇产科学 | 470篇 |
基础医学 | 833篇 |
口腔科学 | 178篇 |
临床医学 | 2130篇 |
内科学 | 1542篇 |
皮肤病学 | 234篇 |
神经病学 | 533篇 |
特种医学 | 574篇 |
外国民族医学 | 6篇 |
外科学 | 1746篇 |
综合类 | 4653篇 |
现状与发展 | 2篇 |
预防医学 | 945篇 |
眼科学 | 804篇 |
药学 | 7828篇 |
27篇 | |
中国医学 | 3829篇 |
肿瘤学 | 602篇 |
出版年
2024年 | 72篇 |
2023年 | 257篇 |
2022年 | 505篇 |
2021年 | 757篇 |
2020年 | 700篇 |
2019年 | 599篇 |
2018年 | 806篇 |
2017年 | 877篇 |
2016年 | 1002篇 |
2015年 | 897篇 |
2014年 | 2034篇 |
2013年 | 1874篇 |
2012年 | 2094篇 |
2011年 | 2182篇 |
2010年 | 1636篇 |
2009年 | 1357篇 |
2008年 | 1235篇 |
2007年 | 1294篇 |
2006年 | 1191篇 |
2005年 | 1037篇 |
2004年 | 758篇 |
2003年 | 662篇 |
2002年 | 581篇 |
2001年 | 471篇 |
2000年 | 357篇 |
1999年 | 308篇 |
1998年 | 234篇 |
1997年 | 197篇 |
1996年 | 172篇 |
1995年 | 149篇 |
1994年 | 139篇 |
1993年 | 97篇 |
1992年 | 70篇 |
1991年 | 98篇 |
1990年 | 79篇 |
1989年 | 53篇 |
1988年 | 59篇 |
1987年 | 42篇 |
1986年 | 29篇 |
1985年 | 59篇 |
1984年 | 51篇 |
1983年 | 36篇 |
1982年 | 38篇 |
1981年 | 32篇 |
1980年 | 17篇 |
1979年 | 27篇 |
1978年 | 23篇 |
1977年 | 17篇 |
1976年 | 11篇 |
1975年 | 13篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
2.
目的 按照国家计划抽验要求,评价国内不同企业生产的注射用盐酸柔红霉素的质量。方法 按国家标准检验与探索性研究相结合,对抽验样品进行检验,对检验结果进行统计分析。结果 共抽取样品17批次,按国家标准检验合格率100.0%。探索性研究对主要杂质的来源与结构进行了研究;建立溶液的澄清度检查方法;对包材相容性及稳定性进行了考察。结论 目前国内注射用盐酸柔红霉素总体质量较好;现行标准有待进一步提高,建议现行标准修订有关物质检查方法,增加特定杂质的控制,增加溶液的澄清度检查;建议企业优化生产工艺,以提高产品质量。 相似文献
3.
Aditya Kelkar Caroll Webers Rohit Shetty Jai Kelkar Nikhil Labhsetwar Abhishek Pandit Madhulika Malode Sayali Tidke 《Indian journal of ophthalmology》2020,68(10):2143
Purpose:To evaluate the rate of compliance and the reasons for loss to follow-up in Indian patients with diabetic macular edema (DME), age-related macular degeneration (AMD), and retinal vein occlusion (RVO) being treated with anti-vascular endothelial growth factor (VEGF) therapy.Methods:This was a retrospective single-center study. Patients with DME, AMD, or RVO were eligible if they initiated anti-VEGF therapy between January 2013 and December 2017. Patients'' data were obtained from hospital electronic records, including the number of injections received, visits, details of follow-up, missed appointments, and reasons for loss to follow-up (>365 days).Results:A total of 648 patients were eligible for the study, of which 334 (51.54%) patients were lost to follow-up. Overall, 343 (64.96%) were males and the overall mean (SD) age was 66.40 (7.44) years. A total of 376 (58.0%) patients had a history of diabetes and 364 (56.2%) patients had a history of hypertension. Further, 127 (38.0), 112 (33.5), and 95 (28.4) had DME, AMD, and RVO, respectively and were lost to follow-up. The most commonly reported reason for loss to follow-up was “non-affordability” (n = 120; 41.1%) followed by “no improvement in vision” (n = 83; 28.4%). “No improvement in vision” (42.2%) and “non-affordability” (37.5%) were higher among patients with DME. No association was found in gender- and treatment-wise distribution of reasons for loss to follow-up.Conclusion:The results showed that around half of the patients with DME, AMD, and RVO were lost to follow-up to intravitreal anti-VEGF therapy, and the most common factors were “non-affordability” and “no improvement in vision.” 相似文献
4.
5.
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
6.
Background
Total knee arthroplasty is a treatment option for debilitating arthritis. In the postoperative period, patients experience moderate to severe pain affecting the rehabilitation, hospital stay, and patient satisfaction. This study aims at utilizing current best evidence to determine whether adductor canal block (ACB) or periarticular injection (PAI) is a better modality for managing short-term postoperative pain and opioid consumption.Methods
Embase, MEDLINE, HealthStar, Emcare, and PubMed were searched for randomized controlled trials from 1946 to August 2018, for literature addressing the comparison of ACB and PAI for pain management in the setting of total knee arthroplasty. A systematic review and meta-analysis were performed.Results
Six studies were included in our meta-analysis. When examining the combined visual analog scale (VAS) pain values for each group, analysis demonstrated greater reduction in scores for the PAI group, and the difference was statistically significant (P = .001). When comparing the VAS scores of subgroups analyzed at specific periods in time, there was a trend toward lower VAS scores in subgroups analyzed at 24 hours and 48 hours postoperatively (at rest and at movement) in the PAI group. Overall opioid consumption was lower in the PAI group, with demonstrated statistical significance (P = .03). When comparing the postoperative subgroups, there was a trend toward decreased opioid use in the PAI group, with 13.25% less opioid use at 48 hours and 9.5% less opioid use at 24 hours.Conclusion
PAI could significantly improve postoperative pain and opioid consumption when compared with ACB. Additional, high-quality studies are required to further address this topic. 相似文献7.
刘彦鹏 《中国卫生标准管理》2020,(5):95-97
目的探讨参附注射液对老年重症肺炎疗效及N末端B型利钠肽原(NT-pro BNP)的影响。方法选择2016年6月—2019年6月医院收治的老年重症肺炎患者80例,以随机数表法将其分为两组,即对照组与研究组各40例。对照组患者接受常规对症治疗,研究组在此基础上应用参附注射液治疗。对比两组临床疗效,治疗前与治疗3 d、5 d时血浆NT-pro BNP水平,以及不良反应情况。结果研究组治疗的总有效率为95.00%,高于对照组77.50%(P<0.05)。治疗后3 d与5 d时研究组血浆NT-pro BNP水平均低于对照组(P<0.01)。两组治疗期间均未见明显的药物不良反应。结论参附注射液能够有效提高老年重症肺炎患者的疗效,调节脑钠肽水平。 相似文献
8.
《药学学报(英文版)》2020,10(7):1294-1308
A great challenge in multi-targeting drug discovery is to identify drug-like lead compounds with therapeutic advantages over single target inhibitors and drug combinations. Inspired by our previous efforts in designing antitumor evodiamine derivatives, herein selective histone deacetylase 1 (HDAC1) and topoisomerase 2 (TOP2) dual inhibitors were successfully identified, which showed potent in vitro and in vivo antitumor potency. Particularly, compound 30a was orally active and possessed excellent in vivo antitumor activity in the HCT116 xenograft model (TGI = 75.2%, 150 mg/kg, p.o.) without significant toxicity, which was more potent than HDAC inhibitor vorinostat, TOP inhibitor evodiamine and their combination. Taken together, this study highlights the therapeutic advantages of evodiamine-based HDAC1/TOP2 dual inhibitors and provides valuable leads for the development of novel multi-targeting antitumor agents. 相似文献
9.
Michael A. Gibney David Fitz-Patrick David C. Klonoff Shahista Whooley Betty Lu Wen Yue 《Current medical research and opinion》2020,36(10):1591-1600
Abstract
Objective
Two similarly designed studies compared user experiences with a second-generation extra-thin-wall, 5-bevel 32?G?×?4?mm pen needle (PN) with redesigned hub versus four thinner commercially available PNs. 相似文献10.
High-pressure injection injuries (HPII) caused by water swelling sealant are rare at present. The patient generally has small-sized skin lesions, and the misleadingly benign presentation may cause delayed treatment at the early stage of management. In addition, radiographic examination may be underestimated. Subsequently, the inadequate surgical intervention may cause tissue necrosis and poor prognosis. Furthermore, the early recognition of water swelling sealant injected into tissue and emergent surgical intervention are the key to successful management for the patient with HPII caused by injecting water swelling sealant to tissue. 相似文献