全文获取类型
收费全文 | 73016篇 |
免费 | 5401篇 |
国内免费 | 1793篇 |
专业分类
耳鼻咽喉 | 701篇 |
儿科学 | 1481篇 |
妇产科学 | 1518篇 |
基础医学 | 8357篇 |
口腔科学 | 1639篇 |
临床医学 | 7583篇 |
内科学 | 15455篇 |
皮肤病学 | 1527篇 |
神经病学 | 4853篇 |
特种医学 | 1681篇 |
外国民族医学 | 6篇 |
外科学 | 8872篇 |
综合类 | 6253篇 |
现状与发展 | 3篇 |
一般理论 | 13篇 |
预防医学 | 6131篇 |
眼科学 | 1650篇 |
药学 | 5877篇 |
53篇 | |
中国医学 | 2344篇 |
肿瘤学 | 4213篇 |
出版年
2024年 | 181篇 |
2023年 | 854篇 |
2022年 | 2007篇 |
2021年 | 3365篇 |
2020年 | 2203篇 |
2019年 | 2413篇 |
2018年 | 2644篇 |
2017年 | 2149篇 |
2016年 | 1891篇 |
2015年 | 2676篇 |
2014年 | 3558篇 |
2013年 | 4293篇 |
2012年 | 6479篇 |
2011年 | 6462篇 |
2010年 | 4232篇 |
2009年 | 3688篇 |
2008年 | 4758篇 |
2007年 | 4717篇 |
2006年 | 4191篇 |
2005年 | 3894篇 |
2004年 | 3067篇 |
2003年 | 2881篇 |
2002年 | 2481篇 |
2001年 | 563篇 |
2000年 | 422篇 |
1999年 | 429篇 |
1998年 | 402篇 |
1997年 | 374篇 |
1996年 | 325篇 |
1995年 | 294篇 |
1994年 | 240篇 |
1993年 | 193篇 |
1992年 | 167篇 |
1991年 | 130篇 |
1990年 | 119篇 |
1989年 | 104篇 |
1988年 | 91篇 |
1987年 | 86篇 |
1986年 | 88篇 |
1985年 | 90篇 |
1984年 | 83篇 |
1983年 | 63篇 |
1982年 | 85篇 |
1981年 | 103篇 |
1980年 | 61篇 |
1979年 | 69篇 |
1978年 | 54篇 |
1977年 | 53篇 |
1976年 | 59篇 |
1975年 | 38篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
151.
Penetrating injuries are a leading cause of unilateral visual loss in young patients. We reviewed the records of 197 patients aged 18 years or younger who underwent primary repair of a penetrating ocular injury at the Wilmer Ophthalmological Institute from January 1970 through December 1981. The injury was caused by sharp objects in 49% of cases, missiles in 35%, and blunt trauma in 14%. Of 159 patients with at least 6 months follow-up, 110 (69%) achieved final vision of 5/200 or better, and 77 patients (48%) achieved final visual acuity of 20/50 or better. The prognosis after a penetrating injury is strongly influenced by the nature of the injury and the extent of initial damage. Several factors were found to correlate with an unfavorable visual outcome, including: initial preoperative visual acuity of worse than 5/200, injuries due to blunt trauma, wounds involving the sclera, double penetrating injuries, dense vitreous hemorrhage, and wounds associated with an intraocular "BB" pellet. 相似文献
152.
Sanchez-Luengos Itsasne Lucas-Jiménez Olaia Ojeda Natalia Peña Javier Gómez-Esteban Juan Carlos Gómez-Beldarrain María Ángeles Vázquez-Picón Raquel Foncea-Beti Nerea Ibarretxe-Bilbao Naroa 《Quality of life research》2022,31(11):3241-3252
Quality of Life Research - This study aimed to determine predictors of health-related quality of life (HRQoL) in Parkinson's disease (PD) and to explore their predictive value before and after... 相似文献
153.
Harrell Taylor Howell Elizabeth A. Balbierz Amy Guel Luz Pena Juan Janevic Teresa Gorbenko Ksenia 《Maternal and child health journal》2022,26(4):913-922
Maternal and Child Health Journal - The purpose of this study was to explore the postpartum experiences of publicly-insured women of color, and identify how postpartum care can be improved to... 相似文献
154.
Ocasio Manuel A. Lozano Alyssa Lee Tae Kyoung Feaster Daniel J. Carrico Adam Prado Guillermo 《Prevention science》2022,23(1):119-129
Prevention Science - Despite the availability of efficacious and effective family-based interventions, such interventions are scarce for sexual minority adolescents, particularly among... 相似文献
155.
156.
Marlene Fabiola Escobedo-Monge María Carmen Torres-Hinojal Enrique Barrado María Antonieta Escobedo-Monge Jos Manuel Marugn-Miguelsanz 《Nutrients》2021,13(4)
Background: Zinc is an essential trace element for the normal growth and development of human beings. The main objective was to evaluate the nutritional status of zinc and its association with nutritional indicators in a series of children with chronic diseases. Methods: The prevalence of patients with dietary zinc deficiency or deficit zinc intake (<80% DRI: dietary reference intake) was analyzed through prospective 72 h dietary surveys, and serum zinc deficiency or hypozincemia (≤70 µg/dL in children under 10 years of age in both sexes and in females older than 10 years and <74 μg/dL in males older than 10 years) was measured through atomic absorption spectrophotometry. The participants were classified according to their nutritional status by body mass index (BMI). Results: Mean serum zinc level in obese (87 µg/dL), undernourished (85 µg/dL), and eutrophic children (88 µg/dL) were normal, but in the undernutrition (60% DRI) and eutrophic (67% DRI) groups the mean dietary zinc intake was low compared to that in the obesity group (81% DRI). There were different associations between nutritional parameters, dietary zinc intake, and serum zinc. All patients with hypozincemia had dietary zinc deficiency. Conclusions: In the whole series, 69% of participants showed a zinc intake lower than recommended and might be at high risk of zinc deficiency. 相似文献
157.
Brenes Monge Alexander Fernández Elorriaga María Poblano Verástegui Ofelia Valdez Santiago Rosario Martínez Nolasco Manuel A. Yáñez Álvarez Iraís Saturno Hernández Pedro J. 《Maternal and child health journal》2021,25(4):565-573
Maternal and Child Health Journal - To identify and describe the frequency and characteristics of disrespect and abuse practices towards women during facility-based delivery in four hospitals in... 相似文献
158.
160.
目的 探讨多药耐药基因(MDR1基因)在人胃癌组织中的表达及其与临床病理的关系。方法 采用逆转录-多聚酶链反应(RT-PCR)法检测了215例手术切除的进展期胃癌组织中的MDR1基因的表达。实验数据采用SAS软件中的χ^2检验和Fisher’s exact P做统计学处理。结果 MDRI基因的阳性率为31.63%(68/215),与年龄、性别、组织学类型、分化程度、淋巴结转移、Borromann分型及TNM分期等无关,但在分化差的肿瘤中有增高趋势,如黏液腺癌及印戒细胞癌中达41.67%及50.00%。结论 化疗前胃癌组织中MDRI基因即存在较高的表达率,这为选用化疗药物和MDR逆转剂提供了参考指标,但不能作为制定化疗方案的唯一指标。 相似文献