全文获取类型
收费全文 | 33380篇 |
免费 | 1879篇 |
国内免费 | 175篇 |
专业分类
耳鼻咽喉 | 438篇 |
儿科学 | 707篇 |
妇产科学 | 740篇 |
基础医学 | 4243篇 |
口腔科学 | 1679篇 |
临床医学 | 2457篇 |
内科学 | 8628篇 |
皮肤病学 | 848篇 |
神经病学 | 2616篇 |
特种医学 | 656篇 |
外科学 | 5513篇 |
综合类 | 227篇 |
一般理论 | 4篇 |
预防医学 | 2307篇 |
眼科学 | 608篇 |
药学 | 1880篇 |
中国医学 | 139篇 |
肿瘤学 | 1744篇 |
出版年
2023年 | 254篇 |
2022年 | 204篇 |
2021年 | 1151篇 |
2020年 | 632篇 |
2019年 | 1214篇 |
2018年 | 1376篇 |
2017年 | 806篇 |
2016年 | 845篇 |
2015年 | 1032篇 |
2014年 | 1508篇 |
2013年 | 1808篇 |
2012年 | 2883篇 |
2011年 | 2946篇 |
2010年 | 1691篇 |
2009年 | 1458篇 |
2008年 | 2252篇 |
2007年 | 2317篇 |
2006年 | 2097篇 |
2005年 | 1854篇 |
2004年 | 1732篇 |
2003年 | 1568篇 |
2002年 | 1446篇 |
2001年 | 212篇 |
2000年 | 185篇 |
1999年 | 215篇 |
1998年 | 172篇 |
1997年 | 152篇 |
1996年 | 118篇 |
1995年 | 139篇 |
1994年 | 107篇 |
1993年 | 98篇 |
1992年 | 88篇 |
1991年 | 72篇 |
1990年 | 74篇 |
1989年 | 54篇 |
1988年 | 56篇 |
1987年 | 46篇 |
1986年 | 36篇 |
1985年 | 47篇 |
1984年 | 40篇 |
1983年 | 43篇 |
1982年 | 50篇 |
1981年 | 45篇 |
1980年 | 42篇 |
1979年 | 21篇 |
1978年 | 25篇 |
1977年 | 27篇 |
1976年 | 20篇 |
1975年 | 27篇 |
1974年 | 23篇 |
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
101.
Ferreira Elisa Arrienti Paloski Luis Henrique Costa Dalton Breno Moret-Tatay Carmen Irigaray Tatiana Quarti 《The Psychiatric quarterly》2020,91(3):853-862
Psychiatric Quarterly - The main goal of this research is to describe the psychopathological symptoms comorbid to animal hoarding disorder. This is a cross-sectional study with a sample of a 33... 相似文献
102.
103.
Infante Jon Serrano-Cárdenas Karla M. Corral‐Juan Marc Farré Xavier Sánchez Ivelisse de Lucas Enrique M. García Antonio Martín-Gurpegui José Luis Berciano José Matilla-Dueñas Antoni 《Journal of neurology》2020,267(2):324-330
Journal of Neurology - Adolescent-onset spastic ataxia is a proposed novel phenotype in compound heterozygous carriers of an intronic mutation (c.1909 + 22G > A) in... 相似文献
104.
Esteban M. Gorostiaga Luis Snchez-Medina Ibai Garcia-Tabar 《Scandinavian journal of medicine & science in sports》2022,32(1):116-124
This report aims to generate an evidence-based debate of the Critical Power (CP), or its analogous Critical Speed (CS), concept. Race times of top Spanish runners were utilized to calculate CS based on three (1500-m to 5000-m; CS1.5-5km) and four (1500-m to 10000-m; CS1.5-10km) distance performances. Male running world records from 1000 to 5000-m (CS1-5km), 1000 to 10,000-m (CS1-10km), 1000-m to half marathon (CS1km-half marathon), and 1000-m to marathon (CS1km-marathon) distance races were also utilized for CS calculations. CS1.5-5km (19.62 km h?1) and CS1.5-10km (18.68 km h?1) were different (p < 0.01), but both approached the average race speed of the longest distance chosen in the model, and were remarkably homogeneous among subjects (97% ±1% and 98% ±1%, respectively). Similar results were obtained using the world records. CS values progressively declined, until reaching a CS1km-marathon value of 20.77 km h?1 (10% lower than CS1-5km). Each CS value approached the average speed of the longest distance chosen in the model (96.4%–99.8%). A power function better fitted the speed-time relationship compared with the standardized hyperbolic function. However, the horizontal asymptote of a power function is zero. This better approaches the classical definition of CP: the power output that can be maintained almost indefinitely without exhaustion. Beyond any sophisticated mathematical calculation, CS corresponds to 95%–99% of the average speed of the longest distance chosen as an exercise trial. CP could be considered a mathematical artifact rather than an important endurance performance marker. In such a case, the consideration of CP as a physiological “gold-standard” should be reevaluated. 相似文献
105.
Velázquez-Pérez Luis Medrano-Montero Jacqueline Rodríguez-Labrada Roberto Canales-Ochoa Nalia Campins Alí Jandy Carrillo Rodes Frank J Rodríguez Graña Tania Hernández Oliver María O. Aguilera Rodríguez Raul Domínguez Barrios Yennis Torres Vega Reydenis Flores Angulo Lissi Cordero Navarro Noharis Y. Sigler Villanueva Aldo A. Gámez Rodríguez Osiel Sagaró Zambrano Ilya Navas Napóles Nayime Y. García Zacarías Javier Serrano Barrera Orlando R. Ramírez Bautista María B. Estupiñán Rodríguez Annelié Guerra Rondón Leonardo A. Vázquez-Mojena Yaimeé González-Zaldivar Yanetza Almaguer Mederos Luis E. Leyva-Mérida Alejandro 《Cerebellum (London, England)》2020,19(2):252-264
The Cerebellum - The prevalence estimations of hereditary ataxias are biased since most epidemiological studies are confined to isolated geographical regions and few nationwide studies are... 相似文献
106.
Marta Perez‐Somarriba Maria Luisa Moreno‐Tejero Maria Isabel Rozas Irene Pelaez Luis Madero Alvaro Lassaletta 《Pediatric blood & cancer》2020,67(2)
Intracranial germ cell tumors (GCT) account for less than 5% of all central nervous system tumors in children in Western countries. Approximately 40% are nongerminomatous GCT (NGGCT). Despite correct treatment, 16% to 47% of the patients will relapse. There are no standard approaches in case of recurrence, and treatment in this situation remains a challenge. We report three patients diagnosed with relapsed intracranial NGGCT treated with gemcitabine, paclitaxel, and oxaliplatin, in whom the tumor showed a remarkable response with normalization of tumor markers. 相似文献
107.
Ana Pardo Sanz PhD Ciro Santoro PhD Rocío Hinojar PhD Luisa Salido PhD Ez-Alddin Rajjoub MD Juan Manuel Monteagudo MD Ana García PhD Ariana González MD Rosana Hernández-Antolín PhD Ángel Sánchez Recalde PhD José Luis Zamorano PhD Covadonga Fernández-Golfín PhD 《Echocardiography (Mount Kisco, N.Y.)》2020,37(4):586-591
108.
Vicente Molina Alba Lubeiro Rodrigo de Luis Garcia Javier Gomez-Pilar Oscar Martín-Santiago María Iglesias-Tejedor Pedro Holgado-Madera Rafael Segarra-Echeverría María Recio-Barbero Pablo Núez Mahmoud Karim Haidar Jessica Fernndez-Sevillano Javier Sanz-Fuentenebro 《Journal of psychiatry & neuroscience : JPN》2020,45(5):322
BackgroundThe synchronized activity of distributed neural assemblies — reflected in the electroencephalogram (EEG) — underpins mental function. In schizophrenia, modulation deficits of EEG spectral content during a P300 task have been replicated. The effects of treatment, chronicity and specificity in these deficits and their possible relationship with anatomic connectivity remain to be explored.MethodsWe assessed spectral entropy modulation of the EEG during a P300 task in 79 patients with schizophrenia (of those, 31 were in their first episode), 29 patients with bipolar disorder and 48 healthy controls. Spectral entropy values summarize EEG characteristics by quantifying the irregularity of spectral content. In a subsample, we calculated the network architecture of structural connectivity using diffusion tensor imaging and graph-theory parameters.ResultsWe found significant spectral entropy modulation deficits with task performance in patients with chronic or first-episode schizophrenia and in patients with bipolar disorder, without significant pre-stimulus spectral entropy differences. The deficits were unrelated to treatment doses, and spectral entropy modulation did not differ between patients taking or not taking antipsychotics, lithium, benzodiazepines or antidepressants. Structural connectivity values were unrelated to spectral entropy modulation. In patients with schizophrenia, spectral entropy modulation was inversely related to negative symptoms and directly related to verbal memory.LimitationsAll patients were taking medication. Patients with bipolar disorder were euthymic and chronic. The cross-sectional nature of this study prevented a more thorough analysis of state versus trait criteria for spectral entropy changes.ConclusionSpectral entropy modulation with task performance is decreased in patients with schizophrenia and bipolar disorder. This deficit was not an effect of psychopharmacological treatment or structural connectivity and might reflect a deficit in the synchronization of the neural assemblies that underlie cognitive activity. 相似文献
109.
110.