全文获取类型
收费全文 | 28400篇 |
免费 | 1877篇 |
国内免费 | 369篇 |
专业分类
耳鼻咽喉 | 540篇 |
儿科学 | 358篇 |
妇产科学 | 373篇 |
基础医学 | 4663篇 |
口腔科学 | 833篇 |
临床医学 | 2590篇 |
内科学 | 5550篇 |
皮肤病学 | 1050篇 |
神经病学 | 2110篇 |
特种医学 | 1669篇 |
外科学 | 3488篇 |
综合类 | 156篇 |
现状与发展 | 3篇 |
一般理论 | 8篇 |
预防医学 | 1136篇 |
眼科学 | 500篇 |
药学 | 2717篇 |
中国医学 | 426篇 |
肿瘤学 | 2476篇 |
出版年
2023年 | 210篇 |
2022年 | 733篇 |
2021年 | 1089篇 |
2020年 | 589篇 |
2019年 | 808篇 |
2018年 | 946篇 |
2017年 | 752篇 |
2016年 | 1106篇 |
2015年 | 1504篇 |
2014年 | 1578篇 |
2013年 | 1886篇 |
2012年 | 2695篇 |
2011年 | 2497篇 |
2010年 | 1530篇 |
2009年 | 1200篇 |
2008年 | 1654篇 |
2007年 | 1513篇 |
2006年 | 1262篇 |
2005年 | 1192篇 |
2004年 | 937篇 |
2003年 | 827篇 |
2002年 | 678篇 |
2001年 | 412篇 |
2000年 | 399篇 |
1999年 | 318篇 |
1998年 | 166篇 |
1997年 | 136篇 |
1996年 | 98篇 |
1995年 | 87篇 |
1994年 | 93篇 |
1993年 | 76篇 |
1992年 | 121篇 |
1991年 | 138篇 |
1990年 | 121篇 |
1989年 | 105篇 |
1988年 | 98篇 |
1987年 | 79篇 |
1986年 | 82篇 |
1985年 | 63篇 |
1984年 | 42篇 |
1983年 | 39篇 |
1979年 | 53篇 |
1978年 | 39篇 |
1977年 | 28篇 |
1975年 | 52篇 |
1974年 | 29篇 |
1972年 | 39篇 |
1971年 | 49篇 |
1970年 | 34篇 |
1968年 | 31篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
71.
Jae-Hun Jung Eun-Ah Kim Sang-Yoon Lee Jung-Eun Moon Eun-Joo Lee Sook-Hyun Park 《Nutrients》2021,13(6)
We aimed to investigate the changes in vitamin D levels and factors associated with vitamin D deficiency (VDD) during the first year of life in Korean preterm infants. We enrolled 333 preterm infants who were born at Kyungpook National University Children’s Hospital between March 2013 and December 2019. 25-hydroxyvitamin D (25-OHD) levels and medical records were collected at birth, 6 months, and 12 months of age. The mean gestational age was 33.4 ± 2.3 weeks and mean 25-OHD levels at birth were 18.2 ± 13.5 ng/mL. The incidence of VDD was 82.8%, 30.6%, and 27.0% at birth, 6 months, and 12 months, respectively. The incidence of severe VDD (25-OHD < 10 ng/mL) was 31.5%, 1.5%, and 0%, at birth, 6 months, and 12 months, respectively. Among infants with severe VDD, the deficiency persisted in 49.6% at 6 months, and 35.3% at 12 months. The strongest predictor of VDD during follow-up was 25-OHD concentration at birth. Vitamin D supplementation at 400 IU/day did not affect vitamin D levels during the first year of life. Therefore, it is important to prevent neonatal VDD through maternal vitamin D supplementation during pregnancy. Further research is needed to determine the optimal vitamin D supplementation dose for Korean preterm infants. 相似文献
72.
73.
74.
Pyoeng Gyun Choe Chang Kyung Kang Hyeon Jeong Suh Jongtak Jung Kyoung-Ho Song Ji Hwan Bang Eu Suk Kim Hong Bin Kim Sang Won Park Nam Joong Kim Wan Beom Park Myoung-don Oh 《Emerging infectious diseases》2021,27(1):327
We investigated the kinetics of severe acute respiratory syndrome coronavirus 2 neutralizing antibodies in 7 asymptomatic persons and 11 patients with pneumonia. The geometric mean titer of neutralizing antibodies declined from 219.4 at 2 months to 143.7 at 5 months after infection, indicating a waning antibody response. 相似文献
75.
Lee Lucy Eunju Pyo Jung Yoon Ahn Sung Soo Song Jason Jungsik Park Yong-Beom Lee Sang-Won 《International urology and nephrology》2021,53(8):1631-1638
International Urology and Nephrology - A systemic inflammation response index (SIRI) has been recently introduced as a tool for the assessment of the prognosis of several critical medical... 相似文献
76.
Jung Kwon Kim Hoyoung Ryu Myong Kim Eun-Kyung Kwon Hakmin Lee Sang Joon Park Seok-Soo Byun 《BJU international》2021,127(5):567-574
77.
78.
79.
Soo Kyung Cho Myung Soo Kim Ho Seok Chung Eu Chang Hwang Seung Il Jung Dongdeuk Kwon Kwangsung Park 《Translational andrology and urology》2021,10(3):1347
Indwelling urethral catheter placement is a common and comparatively safe procedure. Misplacement of a urethral catheter into the upper urinary tract is unusual, and only a few cases have been reported. We describe the case of a 43-year-old man who presented with oliguria and had a history of chemotherapy for known metastatic lung cancer. As he had no history of urological disease, urethral catheterization was expected to be uneventful. The catheter was unable to be pulled back to the bladder neck once the balloon was inflated, and the patient expressed discomfort. Subsequent computed tomography revealed that the tip of the catheter was placed in the middle of the right ureter. Unbeknownst to the physicians before urethral catheterization, the patient had severe lower urinary tract symptoms and urinary bladder dysfunction with hydronephrosis, likely due to chemotherapy. Based on the patient’s symptoms and imaging results, we judged the possibility of severe ureteral injury to be low. The malpositioned catheter was removed uneventfully after complete balloon deflation and then reinserted properly. He was admitted to the medical department but died as a result of an exacerbation of the underlying disease unrelated to the incident. If urethral catheter placement seems abnormal, physicians should aspirate and irrigate to confirm correct positioning before balloon inflation; then, they should carefully pull the inflated balloon near the neck of the bladder while monitoring the patient’s symptoms. Although urethral catheter placement is comparatively safe, physicians must keep in mind that patients who have undergone chemotherapy might be at a risk for this rare complication. 相似文献
80.