全文获取类型
收费全文 | 135786篇 |
免费 | 10295篇 |
国内免费 | 6034篇 |
专业分类
耳鼻咽喉 | 1794篇 |
儿科学 | 1484篇 |
妇产科学 | 2002篇 |
基础医学 | 19751篇 |
口腔科学 | 2742篇 |
临床医学 | 15588篇 |
内科学 | 22502篇 |
皮肤病学 | 2778篇 |
神经病学 | 8346篇 |
特种医学 | 5978篇 |
外国民族医学 | 53篇 |
外科学 | 15948篇 |
综合类 | 10988篇 |
现状与发展 | 22篇 |
一般理论 | 36篇 |
预防医学 | 7743篇 |
眼科学 | 4206篇 |
药学 | 13159篇 |
67篇 | |
中国医学 | 4722篇 |
肿瘤学 | 12206篇 |
出版年
2024年 | 286篇 |
2023年 | 1631篇 |
2022年 | 4454篇 |
2021年 | 6080篇 |
2020年 | 3951篇 |
2019年 | 4118篇 |
2018年 | 4675篇 |
2017年 | 3714篇 |
2016年 | 4331篇 |
2015年 | 6218篇 |
2014年 | 7613篇 |
2013年 | 7448篇 |
2012年 | 11202篇 |
2011年 | 11164篇 |
2010年 | 6718篇 |
2009年 | 5369篇 |
2008年 | 7580篇 |
2007年 | 7119篇 |
2006年 | 6794篇 |
2005年 | 6323篇 |
2004年 | 4726篇 |
2003年 | 4173篇 |
2002年 | 3482篇 |
2001年 | 3144篇 |
2000年 | 3028篇 |
1999年 | 2952篇 |
1998年 | 1647篇 |
1997年 | 1512篇 |
1996年 | 1160篇 |
1995年 | 1076篇 |
1994年 | 913篇 |
1993年 | 611篇 |
1992年 | 921篇 |
1991年 | 812篇 |
1990年 | 751篇 |
1989年 | 668篇 |
1988年 | 615篇 |
1987年 | 548篇 |
1986年 | 425篇 |
1985年 | 375篇 |
1984年 | 249篇 |
1983年 | 196篇 |
1982年 | 97篇 |
1981年 | 109篇 |
1980年 | 70篇 |
1979年 | 144篇 |
1978年 | 90篇 |
1975年 | 61篇 |
1974年 | 87篇 |
1973年 | 69篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Man Bok Jeong Kristina Narfström Shin Ae Park Je Min Chae Kang Moon Seo 《Documenta ophthalmologica. Advances in ophthalmology》2009,119(2):79-88
The objective of this study is to compare the effects of three different anesthetic combinations on the electroretinogram
in the same animals under similar laboratory conditions. Thiopental–isoflurane (TI), medetomidine–ketamine (MK), and xylazine–ketamine
(XK) were used on each of 12 healthy miniature schnauzer dogs (MS) with a period of at least 3 weeks in between subsequent
anesthesia protocols, using the Dog Standard Protocol. The scotopic ERGs consisted of scotopic low stimulus strength (S) responses
designated S1, S2, S3, S4, and S5, at 1, 5, 10, 15, and 20 min after dark adaptation, respectively, and scotopic standard
stimulus strength (S-ST) responses. The photopic ERGs consisted of a photopic single flash (P) response and 31 Hz flicker
(P-FL) responses. For S-ST (2.5 cd s/m2), the amplitude of the a-wave using TI was significantly lower than that using MK (adjusted P = 0.05) and XK (adjusted P = 0.03), and the implicit time of the a-wave was significantly shorter than that using MK (adjusted P = 0.04). For P (2.5 cd s/m2), the amplitude of the b-wave using XK was significantly higher than that using MK (adjusted P = 0.01). The implicit times of the b-wave using TI was significantly longer and shorter than that of MK for S1, S2 and P-FL
and for S4 and S-ST, respectively, and than that of XK for S2 and P-FL and for S5 and S-ST, respectively. The results of the
present study showed that TI affected both the amplitude and the implicit time of the a-wave for S-ST and the implicit time
of the b-wave relatively more so than was the case when using XK or MK. Therefore, it appears that either XK or MK could be
advantageous to use rather than TI for clinical studies. 相似文献
22.
Eun Young Jung Hyung Joo Suh Wan Soo Hong Dong Geon Kim Yang Hee Hong In Sun Hong Un Jae Chang 《Nutrition Research》2009,29(7):457-461
Cooking processes that gelatinize granules or disrupt structure might increase the glucose and insulin responses because a disruption of the structure of starch by gelatinization increases its availability for digestion and absorption in the small intestine. We hypothesized that the uncooked form of rice, which has a relatively low degree of gelatinization even though in powder form, would result in lower metabolic glucose and insulin responses compared with cooked rice (CR). To assess the effects of the gelatinization of rice on metabolic response of glucose and insulin, we investigated the glucose and insulin responses to 3 rice meals of different gelatinization degree in female college students (n = 12): CR (76.9% gelatinized), uncooked rice powder (UP; 3.5% gelatinized), and uncooked freeze-dried rice powder (UFP; 5.4% gelatinized). Uncooked rice powders (UP and UFP) induced lower glucose and insulin responses compared with CR. The relatively low gelatinization degree of UPs resulted in low metabolic responses in terms of the glycemic index (CR: 72.4% vs UP: 49.7%, UFP: 59.8%) and insulin index (CR: 94.8% vs UP: 74.4%, UFP: 68.0%). In summary, UPs that were less gelatinized than CR induced low postprandial glucose and insulin responses. 相似文献
23.
24.
We report a case of extragastrointestinal stromal tumor possibly originating from the prostate. The patient underwent radical prostatectomy because of no metastatic evidence. No recurrence and metastasis have been found during 14 months of follow up. To our knowledge, this may be the third such case published in a report in terms of pathological type. 相似文献
25.
中西医结合治疗小儿轮状病毒肠炎51例 总被引:1,自引:0,他引:1
2004年9月~2006年9月,我院采用中西医结合方法治疗小儿轮状病毒肠炎96例,疗效显著,现报道如下。一般资料本组96例患儿均符合小儿轮状病毒肠炎诊断标准[1],其中男51例,女45例;小于1岁62例,1~3岁34例;伴发热58例;轻度脱水38例,中度脱水36例,重度脱水17例。96例患儿随机分为两组,治疗组51例,对照组45例,病程分别为5.4天和5.3天,两组患儿的年龄、性别、病情及病程等方面,无显著性差异(P>0.05)。治疗方法两组均常规口服思密达(每包含量3g),≤1岁,2/3包/次;>1岁,1~1.5包/次;每天3次。并均静脉补液,纠正水、电解质紊乱,纠正酸中毒并予进食指导。治… 相似文献
26.
Traumatic cervical Brown-Sequard and Brown-Sequard-plus syndromes: the spectrum of presentations and outcomes. 总被引:1,自引:0,他引:1
Brown-Sequard syndrome (BSS) and Brown-Sequard-plus syndrome (BSPS) are characterised by asymmetrical paresis with hypalgesia more marked on the less paretic side. This study examined the clinical features of 38 patients (30 males and 8 females; mean age = 32 years) with traumatic cervical BSS or BSPS who underwent comprehensive inpatient rehabilitation. Twenty two injuries were caused by road traffic accidents, 8 by penetrating injuries, 5 by diving injuries, and 3 by other causes. After an average of 35 days in acute care and 79 days in rehabilitation, 37 patients had increased muscle strength, all 38 patients improved functional abilities, 29 patients walked independently, 34 had spontaneous bladder emptying, 36 were discharged home, and 14 were employed. Statistically significant increases (p less than 0.001) were made in modified Barthel index functional scores between admission and discharge. Patients with BSPS had a better prognosis than did those with 'pure' BSS. Patients with predominant upper limb weakness had more favourable outcomes than did those with predominant lower limb weakness. Few other potentially predictive demographic, injury, or neurological factors were associated with functional outcome. Patients with BSS or BSPS generally have a good prognosis for neurological and functional improvement. 相似文献
27.
Lei Wang Moyi Sun Yuegui Jiang Lianjia Yang Delin Lei Chao Lu Yinghua Zhao Pu Zhang Yaowu Yang Jianhu Li 《Journal of oral and maxillofacial surgery》2006,64(4):636-641
PURPOSE: Perineural invasion is a frequent occurrence in salivary adenoid cystic carcinoma (ACC) and may prevent complete surgical resection. Studies have indicated that nerve growth factor (NGF) and its high-affinity receptor tyrosine kinase A (TrkA) may play a role in perineural invasion in several malignancies in which perineural invasion is observed. The present study was conducted to investigate the expression of NGF and TrkA in salivary ACC and to examine the effects of NGF on adhesion, migration and invasion capacities of a salivary ACC cell line (SACC-83) in vitro. PATIENTS AND METHODS: Expression of NGF and TrkA was explored using immunohistochemistry in paraffin-embedded tissues of 32 cases of salivary ACC. The effects of NGF on in vitro adhesion, migration, and invasion capacities of the SACC-83 cell line were examined using an MTT assay and a modified Boyden chamber assay respectively. RESULTS: In ACC specimens, 31 (96.9%) and 32 (100%) tumors showed immunoreactivity for NGF and TrkA respectively. Significant correlations were found between NGF/TrkA expression levels and perineural invasion (P < .05). In cell adhesion assay, the percent adherences of SACC-83 cells co-cultured with 25 ng/ml NGF at 1.5 hours and 5, 25 ng/ml NGF at 6 hours were significantly higher than that co-cultured with 0 ng/ml NGF (P < .05). However, high concentration of NGF (500 ng/ml) resulted in a significant inhibition of invasion (P < .05). CONCLUSION: Overexpression of NGF and TrkA in human salivary ACC tissues may constitute a reason for perineural invasion in salivary ACC. 相似文献
28.
用视诱发电位和富里叶变换作视力客观估计 总被引:2,自引:0,他引:2
目的:研究用图形视觉诱发电位(PVEP)和离散富里叶变换(DFT)作视力客观估计的方法。方法:检测对象为33只正常眼。用翻转频率为10次/秒,条纹张角分别为30、20、18、12、10、6、4和2弧分的垂直方波光栅图形刺激,记录相应的稳态图形视诱发电位。用离散富里叶交换提取WEP频谱中10Hz成分的幅值。以光栅条纹张角为横坐标、相应的VEP频谱幅值为纵坐标作关系曲线,取阈值附近的近似线性部分的数据点作直线回归,用外推法求得阈值和视力。结果:比较VEP所测之视力与用国际标准视力表所测之视力,可见在本研究中70%的受检眼VEP视力估计较准确。结论:用本研究中的VEP技术客观地测量视力可靠性较高。眼科学报1997;13:59~61。 相似文献
29.
30.
小儿肾积水Anderson-Hynes手术后并发症及其治疗 总被引:1,自引:0,他引:1
对52例(54侧)先天性肾盂输尿管连接部梗阻性肾积水患者行Anderson-Hynes手术,对其手术的并发症进行分析,主要并发症为吻合口梗阻(39%)和泌尿系感染(28%).经腹进行手术,肠梗阻发生率为13%(3/23).患儿手术时年龄与手术后并发症发生率无显著性意义. 相似文献