全文获取类型
收费全文 | 23777篇 |
免费 | 1639篇 |
国内免费 | 136篇 |
专业分类
耳鼻咽喉 | 351篇 |
儿科学 | 557篇 |
妇产科学 | 422篇 |
基础医学 | 3637篇 |
口腔科学 | 2190篇 |
临床医学 | 1835篇 |
内科学 | 5025篇 |
皮肤病学 | 674篇 |
神经病学 | 1766篇 |
特种医学 | 573篇 |
外国民族医学 | 1篇 |
外科学 | 2636篇 |
综合类 | 121篇 |
一般理论 | 11篇 |
预防医学 | 2424篇 |
眼科学 | 401篇 |
药学 | 1686篇 |
中国医学 | 190篇 |
肿瘤学 | 1052篇 |
出版年
2023年 | 250篇 |
2022年 | 270篇 |
2021年 | 1033篇 |
2020年 | 666篇 |
2019年 | 887篇 |
2018年 | 1016篇 |
2017年 | 696篇 |
2016年 | 841篇 |
2015年 | 848篇 |
2014年 | 1127篇 |
2013年 | 1326篇 |
2012年 | 1982篇 |
2011年 | 2149篇 |
2010年 | 1175篇 |
2009年 | 885篇 |
2008年 | 1411篇 |
2007年 | 1396篇 |
2006年 | 1155篇 |
2005年 | 1121篇 |
2004年 | 891篇 |
2003年 | 797篇 |
2002年 | 712篇 |
2001年 | 385篇 |
2000年 | 382篇 |
1999年 | 285篇 |
1998年 | 144篇 |
1997年 | 99篇 |
1996年 | 82篇 |
1995年 | 73篇 |
1994年 | 67篇 |
1993年 | 59篇 |
1992年 | 121篇 |
1991年 | 115篇 |
1990年 | 107篇 |
1989年 | 77篇 |
1988年 | 78篇 |
1987年 | 91篇 |
1986年 | 74篇 |
1985年 | 65篇 |
1984年 | 68篇 |
1983年 | 52篇 |
1982年 | 48篇 |
1981年 | 26篇 |
1979年 | 40篇 |
1978年 | 31篇 |
1977年 | 25篇 |
1970年 | 26篇 |
1969年 | 27篇 |
1967年 | 27篇 |
1966年 | 25篇 |
排序方式: 共有10000条查询结果,搜索用时 140 毫秒
1.
Rupa Narayan MD Traci M. Blonquist MS Ashkan Emadi MD PhD Robert P. Hasserjian MD Meghan Burke BS Christopher Lescinskas BS Donna S. Neuberg ScD Andrew M. Brunner MD Gabriela Hobbs MD Hanno Hock MD PhD Steven L. McAfee MD Yi-Bin Chen MD Eyal Attar MD Timothy A. Graubert MD Christina Bertoli MSN Jenna A. Moran MSN Meghan K. Bergeron MSN Julia E. Foster MSN Aura Y. Ramos BSN Tina T. Som BSN Megan K. Vartanian BSN RN Jennifer L. Story LPN Kristin McGregor MS Molly Macrae BS Tanya Behnan BS Margaret C. Wey PhD Jessica Rae BSN Frederic I. Preffer PhD Patricia Lesho BA Vu H. Duong MD Mason L. Mann BA Karen K. Ballen MD Christine Connolly BS Philip C. Amrein MD Amir T. Fathi MD 《Cancer》2020,126(6):1264-1273
2.
3.
Anne E. Kazak Fang Fang Chen Wei‐Ting Hwang Martha A. Askins Gabriela Vega E. Anders Kolb Anne Reilly Lamia P. Barakat 《Pediatric blood & cancer》2020,67(2)
Purpose: Family psychosocial risk in pediatric oncology can be assessed using the Psychosocial Assessment Tool (PAT), a brief parent report screener based on the Pediatric Psychosocial Preventative Health Model (PPPHM; universal, targeted, and clinical). However, little is known about risk over the course of treatment and its association with medical and psychosocial healthcare utilization. Methods: Primary caregivers of children with cancer participated in this prospective multisite investigation, completing the PAT at diagnosis (T1; n = 396) and 6 months later (T2; n = 304). Healthcare utilization data were extracted from electronic health records. Results: The distribution of PPPHM risk levels at T1 and T2 was highly consistent for the samples. Two‐thirds of families remained at the same level of risk, 18% decreased and 16% increased risk level. Risk was not related to sociodemographic or treatment variables. The PAT risk score correlated with psychosocial contacts over the 6‐month period. Conclusions: Although the majority of families reported universal (low) risk on the PAT and were stable in their risk level over 6 months, reassessing risk is helpful in identifying those families who report higher level of risk during treatment than at diagnosis. PAT scores were related to psychosocial services that are provided to most but not all families and could be tailored more specifically to match risk and delivery of evidence‐based care. 相似文献
4.
5.
6.
7.
Iclea Rocha Gama Euclides Marinho Trindade-Filho Suzana Lima Oliveira Nassib Bezerra Bueno Isabelle Tenório Melo Cyro Rego Cabral-Junior Elenita M. Barros Jaqueline A. Galvão Wanessa S. Pereira Raphaela C. Ferreira Bruna R. Domingos Terezinha da Rocha Ataide 《Metabolic brain disease》2015,30(1):93-98
8.
José Antonio Pereira Miguel Pera Manuel López-Cano Marta Pascual Sandra Alonso Silvia Salvans Marta Jiménez-Toscano Alba González-Martín Luis Grande-Posa 《Cirugía espa?ola》2019,97(1):20-26
Objectives
To determine the incidence of incisional hernia (IH) in the extraction incision (EI) in colorectal resection for cancer. To analyze whether the location of the incision has any relationship with the incidence of hernias and whether mesh could be useful for prevention in high-risk patients.Methods
Retrospective review of the colon and rectal surgery database from January 2015 to December 2016. Data were classified into 2 groups, transverse (TI) and midline incision (MI), and the latter was divided into 2 subgroups (mesh [MIM] and suture [MIS]). Patients were classified using the HERNIAscore. Hernias were diagnosed by clinical and/or CT examination.Results
A total of 182 out of 210 surgical patients were included. After a median follow-up of 13.0 months, 39 IH (21.9%) were detected, 23 of which (13.4%) were in the EI; their frequency was lower in the TI group (3.4%) and in the MIM group (5.9%) than in the MIS group (29.5%; p = 0.007). The probability of developing IH in the MIS group showed an OR = 11.7 (95%CI: 3.3-42.0) compared to the TI group and 4.3 (IC 95%: 1.1-16.3) versus the MIM group.Conclusions
The location of the incision is relevant to avoid incisional hernias. Transverse incisions should be used as the first option. When a midline incision is needed, a prophylactic mesh could be considered in high risk patients because it is safe and associated with low morbidity. 相似文献9.
Toshiro Hara Rony Chanoch-Myers Nathan D. Mathewson Chad Myskiw Lyla Atta Lillian Bussema Stephen W. Eichhorn Alissa C. Greenwald Gabriela S. Kinker Christopher Rodman L. Nicolas Gonzalez Castro Hiroaki Wakimoto Orit Rozenblatt-Rosen Xiaowei Zhuang Jean Fan Tony Hunter Inder M. Verma Kai W. Wucherpfennig Itay Tirosh 《Cancer cell》2021,39(6):779-792.e11
10.
Talita da Silva Mendes de Farias Ariclécio Cunha de Oliveira Sandra Andreotti Fernanda Gaspar do Amaral Patrícia Chimin André Ricardo Alves de Proença Francisco Leonardo Torres Leal Rogério Antonio Laurato Sertié Amanda Baron Campana Andressa Bolsoni Lopes Arnaldo Henrique de Souza José Cipolla‐Neto Fabio Bessa Lima 《Journal of pineal research》2015,58(3):251-261
Melatonin, the main hormone produced by the pineal gland, is secreted in a circadian manner (24‐hr period), and its oscillation influences several circadian biological rhythms, such as the regulation of clock genes expression (chronobiotic effect) and the modulation of several endocrine functions in peripheral tissues. Assuming that the circadian synchronization of clock genes can play a role in the regulation of energy metabolism and it is influenced by melatonin, our study was designed to assess possible alterations as a consequence of melatonin absence on the circadian expression of clock genes in the epididymal adipose tissue of male Wistar rats and the possible metabolic repercussions to this tissue. Our data show that pinealectomy indeed has impacts on molecular events: it abolishes the daily pattern of the expression of Clock, Per2, and Cry1 clock genes and Pparγ expression, significantly increases the amplitude of daily expression of Rev‐erbα, and affects the pattern of and impairs adipokine production, leading to a decrease in leptin levels. However, regarding some metabolic aspects of adipocyte functions, such as its ability to synthesize triacylglycerols from glucose along 24 hr, was not compromised by pinealectomy, although the daily profile of the lipogenic enzymes expression (ATP‐citrate lyase, malic enzyme, fatty acid synthase, and glucose‐6‐phosphate dehydrogenase) was abolished in pinealectomized animals. 相似文献