全文获取类型
收费全文 | 83483篇 |
免费 | 5877篇 |
国内免费 | 203篇 |
专业分类
耳鼻咽喉 | 948篇 |
儿科学 | 2151篇 |
妇产科学 | 1862篇 |
基础医学 | 13058篇 |
口腔科学 | 2003篇 |
临床医学 | 8510篇 |
内科学 | 16218篇 |
皮肤病学 | 1154篇 |
神经病学 | 7725篇 |
特种医学 | 3344篇 |
外国民族医学 | 45篇 |
外科学 | 10987篇 |
综合类 | 757篇 |
一般理论 | 110篇 |
预防医学 | 7560篇 |
眼科学 | 1631篇 |
药学 | 6148篇 |
中国医学 | 195篇 |
肿瘤学 | 5157篇 |
出版年
2022年 | 699篇 |
2021年 | 1495篇 |
2020年 | 946篇 |
2019年 | 1348篇 |
2018年 | 1622篇 |
2017年 | 1162篇 |
2016年 | 1334篇 |
2015年 | 1649篇 |
2014年 | 2057篇 |
2013年 | 3252篇 |
2012年 | 4586篇 |
2011年 | 4712篇 |
2010年 | 3145篇 |
2009年 | 2726篇 |
2008年 | 4209篇 |
2007年 | 4494篇 |
2006年 | 4339篇 |
2005年 | 4176篇 |
2004年 | 4189篇 |
2003年 | 3878篇 |
2002年 | 3763篇 |
2001年 | 2295篇 |
2000年 | 2311篇 |
1999年 | 2138篇 |
1998年 | 1085篇 |
1997年 | 873篇 |
1996年 | 770篇 |
1995年 | 766篇 |
1994年 | 660篇 |
1993年 | 681篇 |
1992年 | 1496篇 |
1991年 | 1433篇 |
1990年 | 1362篇 |
1989年 | 1351篇 |
1988年 | 1124篇 |
1987年 | 1134篇 |
1986年 | 1069篇 |
1985年 | 983篇 |
1984年 | 716篇 |
1983年 | 676篇 |
1982年 | 480篇 |
1981年 | 464篇 |
1980年 | 398篇 |
1979年 | 628篇 |
1978年 | 383篇 |
1977年 | 365篇 |
1975年 | 377篇 |
1974年 | 415篇 |
1973年 | 350篇 |
1972年 | 342篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
3.
Factors predicting the development of pressure ulcers in an at‐risk population who receive standardized preventive care: secondary analyses of a multicentre randomised controlled trial 下载免费PDF全文
4.
5.
Turnbull Chris D. Stockley James A. Madathil Shyam Huq Syed S. A. Cooper Brendan G. Ali Asad Wharton Simon Stradling John R. Heitmar Rebekka 《Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie》2022,260(7):2129-2139
Graefe's Archive for Clinical and Experimental Ophthalmology - Retinal microvascular endothelial dysfunction is thought to be of importance in the development of ocular vascular diseases.... 相似文献
6.
Bielik Peter Bonczek Ondřej Krejčí Přemysl Zeman Tomáš Izakovičová-Hollá Lydie Šoukalová Jana Vaněk Jiří Vojtěšek Bořivoj Lochman Jan Balcar Vladimir J. Šerý Omar 《Clinical oral investigations》2022,26(12):7045-7055
Clinical Oral Investigations - The aim of this study was the analysis of WNT10A variants in seven families of probands with various forms of tooth agenesis and self-reported family history of... 相似文献
7.
Conan MacDougall Theora Canonica Chris Keh Binh An P. Phan Janice Louie 《Pharmacotherapy》2022,42(4):343-361
Rifamycins (rifampin, rifabutin, and rifapentine) play an essential role in the treatment of mycobacterial and some nonmycobacterial infections. They also induce the activity of various drug transporting and metabolizing enzymes, which can impact the concentrations and efficacy of substrates. Many anticoagulant and antiplatelet (AC/AP) agents are substrates of these enzymes and have narrow therapeutic indices, leading to risks of thrombosis or bleeding when coadministered with rifamycins. The objective of this systematic review was to evaluate the effects on AC/AP pharmacokinetics, laboratory markers, and clinical safety and efficacy of combined use with rifamycins. A systematic review following the Preferred Reporting Items for Systematic Reviews and Meta-analyses guidance was performed. The PubMed, Embase, and Web of Science databases were queried for English-language reports on combination use of rifamycins and AC/AP agents from database inception through August 2021. The 29 studies identified examined warfarin (n = 17), direct oral anticoagulants (DOACs) (n = 8), and antiplatelet agents (n = 4) combined with rifampin (n = 28) or rifabutin (n = 1). Eleven studies were case reports or small case series; 14 reported on pharmacokinetic or laboratory markers in healthy volunteers. Rifampin-warfarin combinations led to reductions in warfarin area under the curve (AUC) of 15%–74%, with variability by warfarin isomer and study. Warfarin dose increases of up to 3–5 times prerifampin doses were required to maintain coagulation parameters in the therapeutic range. DOAC AUCs were decreased by 20%–67%, with variability by individual agent and with rifampin versus rifabutin. The active metabolite of clopidogrel increased substantially with rifampin coadministration, whereas prasugrel was largely unaffected and ticagrelor saw decreases. Our review suggests most combinations of AC/AP agents and rifampin are problematic. Further studies are required to determine whether rifabutin or rifapentine could be safe alternatives for coadministration with AC/AP drugs. 相似文献
8.
W. Do T. Elzerman R. de Bree A. Rosenberg T. Forouzanfar E.M. Van Cann 《International journal of oral and maxillofacial surgery》2021,50(5):591-597
The aim of this study was to analyse the effect of body mass index (BMI), both low and high values, on the perioperative complication rate in patients with oral squamous cell carcinoma (OSCC). The medical records of 259 patients operated between 2014 and 2017 for OSCC were reviewed. Univariate and multivariate analyses were performed. Sixty of the 259 patients developed 87 complications. Low or high BMI was not associated with the perioperative complication rate. A longer operating time and increased blood loss were associated with a higher perioperative complication rate and higher Clavien–Dindo grade. Low BMI, American Society of Anesthesiologists score 2 and 3, a longer operating time, and increased blood loss were associated with a longer hospital stay. Low BMI was associated with a longer hospital stay. Neither low nor high BMI was associated with the perioperative complication rate. A longer operating time and increased blood loss were associated with a higher perioperative complication rate and higher Clavien–Dindo grade. 相似文献
9.
Toidi Adekambi Chris C. Ibegbu Stephanie Cagle Ameeta S. Kalokhe Yun F. Wang Yijuan Hu Cheryl L. Day Susan M. Ray Jyothi Rengarajan 《The Journal of clinical investigation》2015,125(5):1827-1838
BACKGROUND. The identification and treatment of individuals with tuberculosis (TB) is a global public health priority. Accurate diagnosis of pulmonary active TB (ATB) disease remains challenging and relies on extensive medical evaluation and detection of Mycobacterium tuberculosis (Mtb) in the patient’s sputum. Further, the response to treatment is monitored by sputum culture conversion, which takes several weeks for results. Here, we sought to identify blood-based host biomarkers associated with ATB and hypothesized that immune activation markers on Mtb-specific CD4+ T cells would be associated with Mtb load in vivo and could thus provide a gauge of Mtb infection.METHODS. Using polychromatic flow cytometry, we evaluated the expression of immune activation markers on Mtb-specific CD4+ T cells from individuals with asymptomatic latent Mtb infection (LTBI) and ATB as well as from ATB patients undergoing anti-TB treatment.RESULTS. Frequencies of Mtb-specific IFN-γ+CD4+ T cells that expressed immune activation markers CD38 and HLA-DR as well as intracellular proliferation marker Ki-67 were substantially higher in subjects with ATB compared with those with LTBI. These markers accurately classified ATB and LTBI status, with cutoff values of 18%, 60%, and 5% for CD38+IFN-γ+, HLA-DR+IFN-γ+, and Ki-67+IFN-γ+, respectively, with 100% specificity and greater than 96% sensitivity. These markers also distinguished individuals with untreated ATB from those who had successfully completed anti-TB treatment and correlated with decreasing mycobacterial loads during treatment.CONCLUSION. We have identified host blood-based biomarkers on Mtb-specific CD4+ T cells that discriminate between ATB and LTBI and provide a set of tools for monitoring treatment response and cure.TRIAL REGISTRATION. Registration is not required for observational studies.FUNDING. This study was funded by Emory University, the NIH, and the Yerkes National Primate Center. 相似文献
10.