全文获取类型
收费全文 | 17444篇 |
免费 | 1381篇 |
国内免费 | 572篇 |
专业分类
耳鼻咽喉 | 43篇 |
儿科学 | 163篇 |
妇产科学 | 173篇 |
基础医学 | 2175篇 |
口腔科学 | 1465篇 |
临床医学 | 1712篇 |
内科学 | 3522篇 |
皮肤病学 | 276篇 |
神经病学 | 803篇 |
特种医学 | 422篇 |
外科学 | 1247篇 |
综合类 | 2178篇 |
现状与发展 | 3篇 |
预防医学 | 830篇 |
眼科学 | 972篇 |
药学 | 2137篇 |
7篇 | |
中国医学 | 844篇 |
肿瘤学 | 425篇 |
出版年
2024年 | 53篇 |
2023年 | 310篇 |
2022年 | 867篇 |
2021年 | 1026篇 |
2020年 | 667篇 |
2019年 | 617篇 |
2018年 | 615篇 |
2017年 | 565篇 |
2016年 | 613篇 |
2015年 | 673篇 |
2014年 | 1123篇 |
2013年 | 1364篇 |
2012年 | 899篇 |
2011年 | 1009篇 |
2010年 | 771篇 |
2009年 | 705篇 |
2008年 | 699篇 |
2007年 | 729篇 |
2006年 | 634篇 |
2005年 | 596篇 |
2004年 | 507篇 |
2003年 | 470篇 |
2002年 | 415篇 |
2001年 | 384篇 |
2000年 | 296篇 |
1999年 | 246篇 |
1998年 | 232篇 |
1997年 | 221篇 |
1996年 | 186篇 |
1995年 | 135篇 |
1994年 | 181篇 |
1993年 | 137篇 |
1992年 | 121篇 |
1991年 | 123篇 |
1990年 | 112篇 |
1989年 | 89篇 |
1988年 | 99篇 |
1987年 | 92篇 |
1986年 | 107篇 |
1985年 | 143篇 |
1984年 | 112篇 |
1983年 | 92篇 |
1982年 | 115篇 |
1981年 | 51篇 |
1980年 | 64篇 |
1979年 | 31篇 |
1978年 | 24篇 |
1977年 | 34篇 |
1976年 | 20篇 |
1975年 | 9篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
2.
Esin Benli Küçük Ercan Kaydok Kürsad Ramazan Zor Gamze Yıldırım Biçer 《Topics in stroke rehabilitation》2020,27(8):630-635
ABSTRACT Objective: Dry eye is reported to be associated with several neurological diseases. The aim of this study is to evaluate the patients with hemiplegia after stroke for dry eye and compare their results with a control group. Materials and methods: Forty-five patients with hemiplegia and 45 individuals as the control group were included in the study. Tear function tests (Schirmer and tear breakup time) and a dry eye questionnaire for dry eye symptoms (ocular surface disease index) were performed and the results of the two groups were compared. Results: Schirmer test results were significantly lower in the post-stroke hemiplegia group compared to the control group (11.3 ± 8.2 mm and 20.6 ± 11.6 mm, respectively, p < .001). Tear breakup time results were significantly lower in the post-stroke hemiplegia group compared to the control group (7.9 ± 3.1 s and 12.1 ± 4.3 s, respectively, p < .001). Ocular surface disease index scores were not significantly different between hemiplegia and control groups (21.6 ± 20.0 and 19.8 ± 13.9, respectively, p = .635). Schirmer scores lower than 10 mm (60% and 30%, p < .001) and tear breakup time results lower than 10 s (65.6% and 28.9%, p < .001) were also higher in the hemiplegia group compared to control group. Conclusion: We found lower Schirmer test and tear breakup time results and similar OSDI scores in hemiplegia patients compared to controls. Hemiplegia patients may have dry eye without typical symptoms. This should be taken into consideration in the follow-up and rehabilitation of post-stroke hemiplegia patients. 相似文献
3.
4.
目的:对应用低分子肝素钙与奥扎格雷联合对患有脑血栓疾病的患者实施治疗的临床效果进行研究。方法整群选择在该院2012年12月—2014年12月就诊的患有脑血栓疾病的患者86例,随机分为对照组和治疗组,每组43例。采用奥扎格雷对对照组患者实施治疗;采用低分子肝素钙与奥扎格雷联合对治疗组患者实施治疗。对比神经功能缺损评分在药物治疗前后的变化幅度、脑神经功能恢复正常时间和脑血栓药物治疗计划实施总时间、脑血栓疾病药物治疗效果、用药期间的不良反应人数。结果治疗组患者神经功能缺损评分在药物治疗前后的变化幅度明显大于对照组;脑神经功能恢复正常时间(9.66±2.41)d和脑血栓药物治疗计划实施总时间(13.28±2.14)d明显短于对照组(13.62±3.47)、(17.39±3.20)d;脑血栓疾病药物治疗效果(总有效率90.6%)明显优于对照组(总有效率69.8%);用药期间的不良反应人数(1例)明显少于对照组(8例)。结论应用低分子肝素钙与奥扎格雷联合对患有脑血栓疾病的患者实施治疗的临床效果非常明显。 相似文献
5.
6.
《Clinical gastroenterology and hepatology》2022,20(5):1112-1121.e4
- Download : Download high-res image (419KB)
- Download : Download full-size image
7.
《The ocular surface》2020,18(4):926-935
PurposeTo visualize and quantify vascular networks in individuals with ocular surface squamous neoplasia (OSSN) through optical coherence tomography angiography (OCTA).MethodCross-sectional study of OSSN patients. Vascular networks were measured by OCTA in the epithelium and sub-epithelial space in the tumors, adjacent tissue, and in the contralateral eye. Vessel area density (VAD, percent of blood vessels within 2.14 mm2), was calculated for each location. Total tumor density (TTD, percent of blood vessels within the entire tumor) was calculated. VAD was assessed separately for corneal and conjunctival locations and compared.ResultsFifteen patients with OSSN were included. The mean age was 61 ± 12 years and the majority were male (80%). The mean tumor area, volume, depth, and TTD were 28.0 ± 9.0 mm2 (range, 10.9–39.7), 9.1 ± 4.1 mm3 (range, 3.4–18.8), 334 ± 125 μm (range, 177–571), and 33.2% ± 11.0% (range, 18.7–58.8), respectively. The VAD was highest within the tumor (28.9% ± 8.7%) followed by the adjacent sub-epithelial tissue and the tissue underneath the conjunctival component of tumor. These densities were higher than the VAD in the tissues of the non-involved eye (all P < 0.05). The VAD within conjunctival component of tumor was significantly higher than those with corneal component (29.8% ± 9.5% vs. 21.1% ± 5.5%, p = 0.006). The VAD under conjunctival tumor was also significantly higher than under corneal component (24.1% ± 7.8% vs. 17.0% ± 6.1%, p = 0.024).ConclusionsOCTA imaging allowed for visualization and quantification of vessel structure and density within, under, and surrounding OSSN. 相似文献
8.
9.
目的分析早发型子痫前期应用低分子肝素期待治疗的临床效果。方法回顾分析2017-01—2018-12间在郑州大学第一附属医院产科终止妊娠的95例早发型子痫前期患者的临床资料。按终止妊娠前是否应用低分子肝素分为2组。对照组(47例)给予降压、解痉等治疗;观察组(48例)在对照组基础上加用低分子肝素。结果2组分娩孕周、妊娠延长时间、妊娠并发症发生率、新生儿出生体质量、新生儿窒息及胎儿宫内窘迫发生率、新生儿Apgar评分等,差异均无统计学意义(P>0.05)。结论对早发型子痫前期患者在常规治疗基础上短期应用低分子肝素,不能延长妊娠时间,不改善母婴结局。 相似文献
10.
Fayiqa Ahamed Bahkir Srinivasan Subramanian Grandee 《Indian journal of ophthalmology》2020,68(11):2378
Purpose:Since the declaration of the lockdown due to COVID-19, the usage of digital devices has gone up across the globe, resulting in a challenge for the visual systems of all ages. The purpose of this study is to assess the impact of the lockdown on digital device usage, and consequently, the ocular surface health implications and circadian rhythm abnormalities related to digital eye strain.Methods:An open online survey was sent through various social media platforms and was open for a period of 2 weeks.Results:A total of 407 usable responses were obtained; the average age of respondents was 27.4 years. Typically, 93.6% of respondents reported an increase in their screen time since the lockdown was declared. The average increase in digital device usage was calculated at about 4.8 ± 2.8 h per day. The total usage per day was found to be 8.65 ± 3.74 hours. Sleep disturbances have been reported by 62.4% of people. Typically, 95.8% of respondents had experienced at least one symptom related to digital device usage, and 56.5% said that the frequency and intensity of these symptoms increased since the lockdown was declared.Conclusion:The study highlighted the drastic increase in use of digital devices after the initiation of the COVID-19 lockdown, and along with it, the slow deterioration of ocular health across all age groups. Awareness about prevention of digital eye strain should be stressed, and going forward, measures to bring these adverse effects to a minimum should be explored. 相似文献