全文获取类型
收费全文 | 34641篇 |
免费 | 2510篇 |
国内免费 | 115篇 |
专业分类
耳鼻咽喉 | 460篇 |
儿科学 | 881篇 |
妇产科学 | 974篇 |
基础医学 | 4545篇 |
口腔科学 | 1609篇 |
临床医学 | 2749篇 |
内科学 | 8810篇 |
皮肤病学 | 820篇 |
神经病学 | 2948篇 |
特种医学 | 1013篇 |
外科学 | 5005篇 |
综合类 | 215篇 |
一般理论 | 7篇 |
预防医学 | 2825篇 |
眼科学 | 537篇 |
药学 | 1892篇 |
中国医学 | 150篇 |
肿瘤学 | 1826篇 |
出版年
2023年 | 242篇 |
2022年 | 529篇 |
2021年 | 1167篇 |
2020年 | 661篇 |
2019年 | 1055篇 |
2018年 | 1376篇 |
2017年 | 881篇 |
2016年 | 918篇 |
2015年 | 1020篇 |
2014年 | 1418篇 |
2013年 | 1705篇 |
2012年 | 2532篇 |
2011年 | 2570篇 |
2010年 | 1517篇 |
2009年 | 1244篇 |
2008年 | 2019篇 |
2007年 | 1997篇 |
2006年 | 1843篇 |
2005年 | 1797篇 |
2004年 | 1588篇 |
2003年 | 1332篇 |
2002年 | 1243篇 |
2001年 | 595篇 |
2000年 | 600篇 |
1999年 | 600篇 |
1998年 | 277篇 |
1997年 | 226篇 |
1996年 | 202篇 |
1995年 | 192篇 |
1994年 | 178篇 |
1993年 | 159篇 |
1992年 | 353篇 |
1991年 | 293篇 |
1990年 | 268篇 |
1989年 | 287篇 |
1988年 | 239篇 |
1987年 | 210篇 |
1986年 | 220篇 |
1985年 | 209篇 |
1984年 | 162篇 |
1983年 | 131篇 |
1982年 | 83篇 |
1981年 | 79篇 |
1979年 | 100篇 |
1978年 | 87篇 |
1976年 | 73篇 |
1975年 | 76篇 |
1974年 | 71篇 |
1973年 | 94篇 |
1972年 | 69篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
12.
Luis Veloza Cristina Teixido Natalia Castrejon Fina Climent Ana Carri Marta Marginet Davide Soldini Blanca Gonzlez‐Farr Inmaculada Ribera‐Cortada Armando Lopez‐Guillermo Eva Gonzlez‐Barca Adriana Sierra Mileyka Herrera Cndida Gmez Adriana Garcia Olga Balagu Elias Campo Antonio Martinez 《Histopathology》2019,75(6):799-812
13.
Pedro Lopez Matheus Daros Pinto Ronei Silveira Pinto 《Ultrasound in medicine & biology》2019,45(2):612-616
In the work described here, our aim was to determine, in an elderly population, changes in muscle thickness (MT), cross-sectional area (CSA) and echo intensity (EI) of the quadriceps muscles at four time points (0, 5, 10 and 15 min; i.e., T0, T5, T10 and T15, respectively) after changing from a standing to supine position. Twenty-one elderly participants (14 men: 68.1 ± 4.6 y; 8 women: 66.8 ± 4.1 y) were evaluated at four time points. Rectus femoris CSA (RFCSA), MT and EI of the quadriceps femoris (QF) muscles were assessed. EI significantly increased from T0 to T5, T10 and T15 (p < 0.001), whereas no differences were observed between T5 and T15 in the rectus femoris (RFEI), vastus intermedius (VIEI) and quadriceps femoris (QFEI). No differences were observed between any time points in the RFCSA and MT of QF muscles. In summary, these results suggest that periods >5 min are not necessary to obtain consistent MT and EI measurements of quadriceps femoris muscles in the elderly population. 相似文献
14.
15.
Paula Cristina Galati Paula Garcia Chiarello Belinda Pinto Simões 《Nutrition and cancer》2016,68(1):86-93
Changes in resting energy expenditure (REE) of cancer patients vary depending on type of tumor, treatment time point and kind of treatment. Little is known about REE of acute leukemia adult patients after treatment, especially with results related to body weight or fat free mass (FFM). This study aimed to assess changes in REE of acute leukemia adult patients before and after the first remission induction. Evaluation of REE was performed by indirect calorimetry and predicted REE was calculated by Harris-Benedict equation. Weight and height were measured and compared to a control group of healthy individuals. FFM was assessed by bioelectrical impedance for adjusting REE values. We evaluated 18 patients and 26 healthy individuals. At diagnosis, patients presented REE, REE/weight, and REE/FFM higher than the controls. Reductions of REE, REE/weight, and REE/FFM were also observed in patients after the first cycle of chemotherapy. The predicted REE for the patients group showed significant lower value compared with measured REE. Before the first cycle of chemotherapy REE was increased but undergoes a reduction after treatment, reaching values similar to the controls. For predictive Harris-Benedict equation, stress factors should be added to avoid underestimation of REE before and after chemotherapy. 相似文献
16.
Molly Orcutt Wendy C. King Melissa A. Kalarchian Michael J. Devlin Marsha D. Marcus Luis Garcia Kristine J. Steffen James E. Mitchell 《Surgery for obesity and related diseases》2019,15(2):295-303
Background
A history of childhood maltreatment and psychopathology are common in adults with obesity.Objectives
To report childhood maltreatment and to evaluate associations between severity and type of childhood maltreatment and lifetime history of psychopathology among adults with severe obesity awaiting bariatric surgery.Setting
Four clinical centers of the Longitudinal Assessment of Bariatric Surgery Research Consortium.Methods
The Childhood Trauma Questionnaire, which assesses presence/severity (i.e., none, mild, moderate, severe) of physical abuse, mental abuse, physical neglect, mental neglect, and sexual abuse, was completed by 302 female and 66 male bariatric surgery patients. Presurgery lifetime history of psychopathology and suicidal ideation/behavior were assessed with the Structured Clinical Interview for DSM-IV and the Suicidal Behavioral Questionnaire-Revised, respectively. Presurgery lifetime history of antidepressant use was self-reported.Results
Two thirds (66.6%) of females and 47.0% of males reported at least 1 form of childhood trauma; 42.4% and 24.2%, respectively, at greater than or equal to moderate severity. Among women, presence/greater severity of childhood mental or physical abuse or neglect was associated with a higher risk of history of psychopathology (i.e., major depressive disorder, posttraumatic stress disorder, other anxiety disorder, alcohol use disorder, binge eating disorder), suicidal ideation/behavior and antidepressant use (P for all ≤ .02). These associations were independent of age, race, education, body mass index, and childhood sexual abuse. Childhood sexual abuse was independently associated with a history of suicidal ideation/behavior and antidepressant use only (P for both ≤ .05). Statistical power was limited to evaluate these associations among men.Conclusion
Among women with obesity, presence/severity of childhood trauma was positively associated with relatively common psychiatric disorders. 相似文献17.
18.
19.
20.