全文获取类型
收费全文 | 10799篇 |
免费 | 829篇 |
国内免费 | 34篇 |
专业分类
耳鼻咽喉 | 199篇 |
儿科学 | 290篇 |
妇产科学 | 329篇 |
基础医学 | 1518篇 |
口腔科学 | 202篇 |
临床医学 | 844篇 |
内科学 | 2705篇 |
皮肤病学 | 264篇 |
神经病学 | 1010篇 |
特种医学 | 310篇 |
外科学 | 1596篇 |
综合类 | 77篇 |
一般理论 | 3篇 |
预防医学 | 824篇 |
眼科学 | 228篇 |
药学 | 605篇 |
中国医学 | 35篇 |
肿瘤学 | 623篇 |
出版年
2023年 | 46篇 |
2021年 | 160篇 |
2020年 | 119篇 |
2019年 | 250篇 |
2018年 | 283篇 |
2017年 | 205篇 |
2016年 | 227篇 |
2015年 | 244篇 |
2014年 | 331篇 |
2013年 | 483篇 |
2012年 | 588篇 |
2011年 | 621篇 |
2010年 | 389篇 |
2009年 | 381篇 |
2008年 | 531篇 |
2007年 | 594篇 |
2006年 | 576篇 |
2005年 | 571篇 |
2004年 | 501篇 |
2003年 | 487篇 |
2002年 | 433篇 |
2001年 | 282篇 |
2000年 | 313篇 |
1999年 | 286篇 |
1998年 | 90篇 |
1997年 | 89篇 |
1996年 | 66篇 |
1995年 | 64篇 |
1994年 | 56篇 |
1993年 | 54篇 |
1992年 | 184篇 |
1991年 | 172篇 |
1990年 | 184篇 |
1989年 | 153篇 |
1988年 | 132篇 |
1987年 | 121篇 |
1986年 | 136篇 |
1985年 | 138篇 |
1984年 | 110篇 |
1983年 | 95篇 |
1982年 | 59篇 |
1981年 | 57篇 |
1980年 | 54篇 |
1979年 | 97篇 |
1978年 | 74篇 |
1977年 | 60篇 |
1976年 | 58篇 |
1975年 | 47篇 |
1974年 | 68篇 |
1973年 | 52篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Fournier Jay C. Forand Nicholas R. Wang Zheng Li Zhexuan Iyengar Satish DeRubeis Robert J. Shelton Richard Amsterdam Jay Jarrett Robin B. Vittengl Jeffrey R. Segal Zindel Dimidjian Sona Shea M. Tracie Dobson Keith S. Hollon Steven D. 《Cognitive therapy and research》2022,46(3):517-531
Cognitive Therapy and Research - Baseline severity has emerged as a key predictor of acute response to treatments for depression. The goals of this individual patient data meta-analysis were to... 相似文献
2.
3.
4.
Kim Sung Jin Park Min Uk Chae Han Kyu Nam Wook Kim So Won Yu Hoon Kim Han Gwun Kang Gil Hyun Park Jong Yeon 《International journal of clinical oncology / Japan Society of Clinical Oncology》2022,27(2):403-410
International Journal of Clinical Oncology - Previous studies have shown a relationship between the occurrence and recurrence of prostate cancer; however, this relationship remains controversial.... 相似文献
5.
Youngster Michal Avraham Sarit Yaakov Odelia Landau Rabbi Moran Gat Itai Yerushalmi Gil Baum Micha Maman Ettie Hourvitz Ariel Kedem Alon 《Journal of assisted reproduction and genetics》2022,39(7):1565-1570
Journal of Assisted Reproduction and Genetics - To study the effect of SARS-CoV-2 infection on pregnancy rates in frozen embryo transfer (FET) cycles. A retrospective cohort study including women... 相似文献
6.
Corra Mab P. Correia-Silva Rebeca D. Sasso Gisela R. Silva Dvila Solange C. G. P. Greco Karin V. Oliani Sonia M. Gil Cristiane D. 《Inflammation》2022,45(3):1133-1145
Inflammation - The pathogenesis of atopic dermatitis (AD) and psoriasis (Ps) overlaps, particularly the activation of the immune response and tissue damage. Here, we evaluated galectin (Gal)-1 and... 相似文献
7.
Joseph Wheatley Zhengyang Liu Joel Loth Mark P. Plummer Jahan C. Penny-Dimri Reny Segal Julian Smith Luke A. Perry 《Acta anaesthesiologica Scandinavica》2023,67(2):131-141
Background
Patients undergoing cardiac surgery are at significant risk of developing postoperative acute kidney injury (AKI). Neutrophil–lymphocyte ratio (NLR) is a widely available inflammatory biomarker which may be of prognostic value in this setting.Methods
We conducted a systematic review and meta-analysis of studies reporting associations between perioperative NLR with postoperative AKI. We searched Medline, Embase and the Cochrane Library, without language restriction, from inception to May 2022 for relevant studies. We meta-analysed the reported odds ratios (ORs) with 95% confidence intervals (CIs) for both elevated preoperative and postoperative NLR with risk of postoperative AKI and need for renal replacement therapy (RRT). We conducted a meta-regression to explore inter-study statistical heterogeneity.Results
Twelve studies involving 10,724 participants undergoing cardiac surgery were included, with eight studies being deemed at high risk of bias using PROBAST modelling. We found statistically significant associations between elevated preoperative NLR and postoperative AKI (OR 1.45, 95% CI 1.18–1.77), as well as postoperative need for RRT (OR 2.37, 95% CI 1.50–3.72). Postoperative NLR measurements were not of prognostic significance.Conclusions
Elevated preoperative NLR is a reliable inflammatory biomarker for predicting AKI following cardiac surgery. 相似文献8.
9.
Carmen Freire Esperanza Amaya Fernando Gil Mario Murcia Sabrina LLop Maribel Casas Martine Vrijheid Aitana Lertxundi Amaia Irizar Guillermo Fernández-Tardón Rafael Vicente Castro-Delgado Nicolás Olea Mariana F. Fernández 《International journal of hygiene and environmental health》2019,222(3):468-478
Objective
To examine the association of placental levels of arsenic (As), cadmium (Cd), mercury (Hg), lead (Pb), manganese (Mn), and chromium (Cr) with birth outcomes (birth weight, length, and head circumference, low birth weight [LBW], gestational age, preterm delivery, and small for gestational age [SGA]) in mother-child pairs from the Environment and Childhood (INMA) Project in Spain.Methods
Metal concentrations were measured in placenta tissue samples randomly selected from five INMA cohorts. Data on birth outcomes were obtained from medical records. Associations were assessed in a sub-sample of 327 mother-infant pairs by regression models adjusted for confounding factors and for all metals simultaneously. Effect modification by sex was also evaluated.Results
Elevated placental Cd levels (>5.79 vs. <3.30?ng/g) were associated with reduced birth weight (?111.8?g, 95%CI?=??215.6; ?8.06, p-trend?=?0.01) and length (?0.62?cm, 95%CI?=??1.20; ?0.04, p-trend?=?0.02), while a 10% increase in Cd was associated with 1.21-fold increased odds (95%CI?=?1.01; 1.43) of LBW in the global sample but with 14% lower odds (95%CI?=?0.78; 0.96) of preterm delivery in males (Pinteraction?=?0.10). Detected (vs. undetected) Hg was associated with reduced head circumference (?0.49?cm, 95%CI?=??1.00; 0.03) in females (Pinteraction?=?0.03). A 10% increase in placental Mn was associated with slight increases in gestational age (0.04 weeks, 95%CI?=?0.01; 0.07) in the global sample and in head circumference (0.05?cm, 95%CI?=??0.01; 0.10) in females (Pinteraction?=?0.03). Elevated Cr levels (>99.6 vs. <56.1?ng/g) were associated with reduced birth length (?0.68?cm, 95%CI?=??1.33; ?0.04, p-trend?=?0.02) and slightly increased gestational age (0.35 weeks, 95%CI?=??0.07; 0.77, p-trend?=?0.08) in the global sample. As and Pb were detected in few placentas (27% and 13%, respectively) and were not associated with any studied birth outcome.Conclusions
Data suggest that in utero exposure to Cd, Hg, and Cr could adversely affect fetal growth, whereas Mn and Cr appear to have a positive effect on gestational age. Given the relatively small number of subjects, sex-specific associations should be interpreted with caution. 相似文献10.
Sonia Moreno-Grau Itziar de Rojas Isabel Hernández Inés Quintela Laura Montrreal Montserrat Alegret Begoña Hernández-Olasagarre Laura Madrid Antonio González-Perez Olalla Maroñas Maitée Rosende-Roca Ana Mauleón Liliana Vargas Asunción Lafuente Carla Abdelnour Octavio Rodríguez-Gómez Silvia Gil Miguel Ángel Santos-Santos Agustín Ruiz 《Alzheimer's & dementia》2019,15(10):1333-1347
IntroductionLarge variability among Alzheimer's disease (AD) cases might impact genetic discoveries and complicate dissection of underlying biological pathways.MethodsGenome Research at Fundacio ACE ([email protected]) is a genome-wide study of dementia and its clinical endophenotypes, defined based on AD's clinical certainty and vascular burden. We assessed the impact of known AD loci across endophenotypes to generate loci categories. We incorporated gene coexpression data and conducted pathway analysis per category. Finally, to evaluate the effect of heterogeneity in genetic studies, [email protected] series were meta-analyzed with additional genome-wide association study data sets.ResultsWe classified known AD loci into three categories, which might reflect the disease clinical heterogeneity. Vascular processes were only detected as a causal mechanism in probable AD. The meta-analysis strategy revealed the ANKRD31-rs4704171 and NDUFAF6-rs10098778 and confirmed SCIMP-rs7225151 and CD33-rs3865444.DiscussionThe regulation of vasculature is a prominent causal component of probable AD. [email protected] meta-analysis revealed novel AD genetic signals, strongly driven by the presence of clinical heterogeneity in the AD series. 相似文献