全文获取类型
收费全文 | 574544篇 |
免费 | 85762篇 |
国内免费 | 34755篇 |
专业分类
耳鼻咽喉 | 5497篇 |
儿科学 | 10736篇 |
妇产科学 | 5928篇 |
基础医学 | 66461篇 |
口腔科学 | 13527篇 |
临床医学 | 82247篇 |
内科学 | 85836篇 |
皮肤病学 | 12938篇 |
神经病学 | 34425篇 |
特种医学 | 20372篇 |
外国民族医学 | 251篇 |
外科学 | 55607篇 |
综合类 | 100357篇 |
现状与发展 | 121篇 |
一般理论 | 58篇 |
预防医学 | 44563篇 |
眼科学 | 15034篇 |
药学 | 60817篇 |
659篇 | |
中国医学 | 36524篇 |
肿瘤学 | 43103篇 |
出版年
2024年 | 1831篇 |
2023年 | 7325篇 |
2022年 | 19247篇 |
2021年 | 25501篇 |
2020年 | 24032篇 |
2019年 | 25138篇 |
2018年 | 25190篇 |
2017年 | 26667篇 |
2016年 | 25543篇 |
2015年 | 33785篇 |
2014年 | 39249篇 |
2013年 | 38330篇 |
2012年 | 43665篇 |
2011年 | 47782篇 |
2010年 | 39544篇 |
2009年 | 30606篇 |
2008年 | 32102篇 |
2007年 | 30396篇 |
2006年 | 28493篇 |
2005年 | 26321篇 |
2004年 | 17631篇 |
2003年 | 16850篇 |
2002年 | 13913篇 |
2001年 | 11920篇 |
2000年 | 11107篇 |
1999年 | 10157篇 |
1998年 | 6186篇 |
1997年 | 5997篇 |
1996年 | 4646篇 |
1995年 | 4290篇 |
1994年 | 3686篇 |
1993年 | 2353篇 |
1992年 | 2745篇 |
1991年 | 2415篇 |
1990年 | 2040篇 |
1989年 | 1770篇 |
1988年 | 1475篇 |
1987年 | 1358篇 |
1986年 | 1067篇 |
1985年 | 773篇 |
1984年 | 426篇 |
1983年 | 309篇 |
1982年 | 156篇 |
1981年 | 186篇 |
1980年 | 123篇 |
1979年 | 167篇 |
1978年 | 77篇 |
1977年 | 54篇 |
1974年 | 45篇 |
1973年 | 42篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Vincent Chung Liang Liu Zhaoxiang Bian Zhongzhen Zhao Wai Leuk Fong Wan Fung Kum Jing Gao Min Li 《Movement disorders》2006,21(10):1709-1715
The objective of this study is to assess the efficacy and safety of herbal medicines (HMs), as a monotherapy or adjunct therapy, compared to placebo or conventional approaches in the treatment of idiopathic Parkinson's disease (PD). We conducted a systematic review of randomized controlled trials from both conventional and alternative medicine sources. Outcome measures were overall improvement, quality of life, reduction of levodopa dose, and adverse events. Nine studies were included, each testing a different HM. Six of the trials had limited internal validity due to major flaws in design, including the lack of proper randomization; insufficient blinding; unclear inclusive criteria in terms of diagnostic criteria, baseline staging, and duration of disease; lack of proper sample size calculation; and insufficient data analysis. Imbalances in gender and ethnicity among the patients in the included trials were observed. No major adverse events emerged, and no specific pattern was detected from the trials describing such data. In addition to major methodological defects, heterogeneity in (1) HM tested, (2) control treatment, and (3) outcome measure hindered in-depth data analysis and synthesis. Current evidence is insufficient to evaluate the efficacy and safety of various HMs. Further studies with improved trial design and reporting, with assessment on cost-effectiveness, quality of life, and qualitative data are warranted. 相似文献
22.
慢性萎缩性胃炎是以胃黏膜上皮和腺体萎缩、黏膜变薄为特征的慢性疾病。属中医胃脘痛、胃痞等范畴。其病因病机较为复杂,多与饮食不调、情志不畅有关,尤其是饮酒、过食刺激之品,致使脾胃受损,阳气郁遏不振,纳运失司,化源不足,气血阴液亏乏;或中焦运化无力,湿邪滞塞,郁而化热;或 相似文献
23.
24.
Abstract: Background: Identification of risk drinking in expectant fathers may be helpful as an important part of efforts to minimize maternal alcohol use, and as an opportunity to inform them about a problematic practice during a critical developmental stage for the couple. The purpose of this study was to evaluate the T‐ACE screening questionnaire, which asks about t olerance to alcohol, being a nnoyed by other's comments about drinking, attempts to c ut down, and having a drink first thing in the morning (“ e ye‐opener”), in the male partners of pregnant women who themselves were T‐ACE positive. Methods: Two hundred fifty‐four male partners were asked to complete the T‐ACE embedded in a health survey, the Alcohol Use Disorders Identification Test (AUDIT), and other questions about their alcohol use in the past 30 days when their pregnant partners had a median gestation of 11.5 weeks (T1). After delivery, male partners again completed the T‐ACE and quantity‐frequency questions (T2). The predictive ability of the T‐ACE and AUDIT was compared, using risk drinking (>4 drinks/day or >14 drinks/week) as the criterion standard. Results: A substantial minority of male partners had risk drinking, 31 percent at T1 and 25 percent at T2. Although the AUDIT was better than the T‐ACE as an independent predictor of risk drinking, the latter was most accurate when the tolerance threshold exceeded 2 drinks, the same established for pregnant women. The sensitivity (T1 = 84.6%, T2 = 82.8%) and specificity (T1 = 43.8%, T2 = 51.1%) of the T‐ACE at this threshold compared favorably with those of the AUDIT at the standard cut point of 8. Conclusions: The T‐ACE may be a practical way for clinicians to identify risk drinking in both pregnant women and expectant fathers. (BIRTH 33:2 June 2006) 相似文献
25.
本文报告113例脑前循环系统动脉管其中包括颈内动脉后交通动脉瘤75例.前交通动脉瘤17例,大脑中动脉瘤10例,人脑前动脉-胼周动脉瘤3例,颈内动脉-眼动脉瘤2例,颈内动脉海绵窦段动脉瘤1例.多发动脉瘤5例.共118个动脉瘤在显微镜下直视手术,动脉瘤直接夹闭术108例.孤立或包裹术5例:5例多发动脉瘤行同期手术3例,分期手术2例.术中发生动脉瘤破裂18次.Hunt和HessⅠ~Ⅱ级病人中有例行早期手术.全组术后死亡率为7.9%.着重讨论手术时机.术中动脉瘤破裂处理及多发动脉瘤的治疗. 相似文献
26.
缺氧缺血性脑病新生鼠补钙前后脑细胞,红细胞内外钙的变化 总被引:31,自引:0,他引:31
为了观察一般剂量补钙对缺氧缺血性脑病(HIE)脑细胞和红细胞内外钙变化的影响,以探讨HIE时补钙是否增加脑细胞钙超载,用HIE新生动物模型进行了实验研究,结果表明:(1)缺氧缺血时红细胞、脑细胞及脑组织出现钙积聚;(2)补钙后,血浆总钙浓度明显升高,而脑细胞、脑组织及红细胞钙积聚并未加重;(3)血浆总钙浓度与脑细胞或红细胞胞浆游离钙离子浓度无相关关系。提示:(1)HIE时钙内流可能是全身性的;(2)对HIE并低钙血症患儿吸氧后一般剂量补钙可能是安全的。 相似文献
27.
戴慧芬教授治疗痛经的经验 总被引:2,自引:0,他引:2
严继林 《云南中医学院学报》1996,19(4):32-33
介绍了戴彗芬教授应用逍遥散、当归调经汤、温经汤、和经止痛汤,当归芍药散、当归四逆加吴萸、生姜汤、血府逐瘀汤治疗痛经的经验。 相似文献
28.
29.
Comparison of PET, MRI, and CT with pathology in a proven case of Alzheimer's disease 总被引:1,自引:0,他引:1
Positron emission tomography (PET) with fluorodeoxyglucose (FDG), magnetic resonance imaging (MRI), and CT were carried out in a patient with Alzheimer's disease 16 months before he died. At autopsy, the gross appearance of the brain correlated with MRI and CT, which showed some regional atrophy. These were much less revealing than PET, which correlated with microscopic findings of neuronal loss and proliferation of glia. In areas of moderately impaired local cerebral metabolic rate of glucose, as revealed by reduced FDG uptake, there was some gliosis, primarily around the numerous senile plaques. In areas of severe metabolic impairment, there was a profound loss of neurons, extensive gliosis, and a diminished appearance of plaques. PET-FDG is a better measure of the severity of Alzheimer's disease than MRI or CT, because it reflects the degree of neuronal pathology. 相似文献
30.
Serum aminogram changes were prospectively studied in 95 patients with enteric fistula and intraabdominal infection who was under total parenteral nutrition (TPN) therapy with Anfuming 14s. In patients with sepsis and starvation, the aminogram showed remarkably low total free amino acids before TPN therapy. In 81 survivors, free amino acids increased gradually to normal in 2 weeks after use of TPN and in 14 dead cases increased rapidly to a significantly higher peak at terminal stage. Both in survivors and nonsurvivors, phenylalanine level remained high during the study. In response to infection, proline was also elevated but to a lesser degree; the ratio of branched chain amino acid (BCAA) to aromatic amino acid (AAA) was lower than normal and the decrease of arginine was parallel to the severity of infection. We conclude that the ideal amino acids preparation for the starvated and septic patients should be high in BCAA and arginine but low in phenylalanine, administration of inappropriate exogenous amino acids in decompensated metabolic septic patients may bring about more harm than benefit, and in septic patients that the levels of serum phenylalanine and proline are elevated persistently along with the decrease of arginine level is a useful prognostic indication. 相似文献