全文获取类型
收费全文 | 3452篇 |
免费 | 368篇 |
国内免费 | 184篇 |
专业分类
耳鼻咽喉 | 16篇 |
儿科学 | 26篇 |
妇产科学 | 50篇 |
基础医学 | 415篇 |
口腔科学 | 45篇 |
临床医学 | 402篇 |
内科学 | 466篇 |
皮肤病学 | 42篇 |
神经病学 | 283篇 |
特种医学 | 137篇 |
外国民族医学 | 1篇 |
外科学 | 284篇 |
综合类 | 667篇 |
现状与发展 | 1篇 |
预防医学 | 183篇 |
眼科学 | 114篇 |
药学 | 367篇 |
4篇 | |
中国医学 | 236篇 |
肿瘤学 | 265篇 |
出版年
2024年 | 7篇 |
2023年 | 51篇 |
2022年 | 124篇 |
2021年 | 154篇 |
2020年 | 140篇 |
2019年 | 123篇 |
2018年 | 109篇 |
2017年 | 120篇 |
2016年 | 119篇 |
2015年 | 168篇 |
2014年 | 196篇 |
2013年 | 169篇 |
2012年 | 254篇 |
2011年 | 249篇 |
2010年 | 194篇 |
2009年 | 140篇 |
2008年 | 126篇 |
2007年 | 126篇 |
2006年 | 130篇 |
2005年 | 165篇 |
2004年 | 88篇 |
2003年 | 102篇 |
2002年 | 101篇 |
2001年 | 93篇 |
2000年 | 86篇 |
1999年 | 104篇 |
1998年 | 67篇 |
1997年 | 64篇 |
1996年 | 63篇 |
1995年 | 56篇 |
1994年 | 33篇 |
1993年 | 19篇 |
1992年 | 36篇 |
1991年 | 29篇 |
1990年 | 24篇 |
1989年 | 33篇 |
1988年 | 26篇 |
1987年 | 18篇 |
1986年 | 24篇 |
1985年 | 31篇 |
1984年 | 13篇 |
1983年 | 11篇 |
1982年 | 4篇 |
1981年 | 5篇 |
1979年 | 4篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1972年 | 1篇 |
1970年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有4004条查询结果,搜索用时 15 毫秒
91.
目的 探讨高弹力无纺布衬垫在气压止血带应用中的临床效果.方法 取80例四肢骨折患者,将其随机分为两组.对照组用普通绷带做气压止血带的衬垫;实验组则直接在肢体上套一层高弹力无纺布衬垫,然后环绕气压止血带;比较两组临床应用效果.结果 总有效率实验组为97.5%,对照组为90.0%;医生对手术中止血效果及衬垫满意率实验组为95.0%,对照组为85.0%;皮肤反应发生率实验组为2.5%,对照组为10.0%;两组比较,均P< 0.05,差异均具有统计学意义.结论 四肢手术中气压止血带使用率较高,高弹力无纺布衬垫比普通绷带衬垫效果好,具有无压痕、无皱折、不滑脱、不松动、高弹力等优点,值得推广使用. 相似文献
92.
Sheng-Yu Lee Shiou-Lan Chen Yun-Hsuan Chang Chun-Hsien Chu Shih-Heng Chen Po See Chen San-Yuan Huang Nian-Sheng Tzeng Liang-Jen Wang I Hui Lee Tzu-Yun Wang Kao Chin Chen Yen Kuang Yang Jau-Shyong Hong Ru-Band Lu 《The international journal of neuropsychopharmacology / official scientific journal of the Collegium Internationale Neuropsychopharmacologicum (CINP)》2015,18(7)
Background:
Low-dose dextromethorphan (DM) might have anti-inflammatory and neurotrophic effects mechanistically remote from an NMDA receptor. In a randomized, double-blind, controlled 12 week study, we investigated whether add-on dextromethorphan reduced cytokine levels and benefitted opioid-dependent patients undergoing methadone maintenance therapy (MMT).Methods:
Patients were randomly assigned to a group: DM60 (60mg/day dextromethorphan; n = 65), DM120 (120mg/day dextromethorphan; n = 65), or placebo (n = 66). Primary outcomes were the methadone dose required, plasma morphine level, and retention in treatment. Plasma tumor necrosis factor (TNF)-α, C-reactive protein, interleukin (IL)-6, IL-8, transforming growth factor–β1, and brain-derived neurotrophic factor (BDNF) levels were examined during weeks 0, 1, 4, 8, and 12. Multiple linear regressions with generalized estimating equation methods were used to examine the therapeutic effect.Results:
After 12 weeks, the DM60 group had significantly longer treatment retention and lower plasma morphine levels than did the placebo group. Plasma TNF-α was significantly decreased in the DM60 group compared to the placebo group. However, changes in plasma cytokine levels, BDNF levels, and the methadone dose required in the three groups were not significantly different.Conclusions:
We provide evidence—decreased concomitant heroin use—of low-dose add-on DM’s efficacy for treating opioid-dependent patients undergoing MMT. 相似文献93.
Background:Lung cancer (LC) is the malignant tumor with the highest incidence in the world, and treatment methods include surgery, radiotherapy, chemotherapy, and immunotherapy. Cancer pain is a common symptom in patients with LC, and the clinical treatment is to relieve it with analgesics. Acupuncture can relieve cancer pain. This study aims to systematically study the efficacy and safety of acupuncture combined with analgesics on cancer pain in patients with LC.Methods:From the beginning to April 2021, search Medline, Embase, Cochrane Central Controlled Trials Register (Central), China National Knowledge Infrastructure (CNKI), Wanfang Database, China Biomedical Literature Database (CBM), and Chinese Science Journal Database (VIP database). Search the international clinical trial registration platform and the Chinese clinical trial registration platform to find ongoing or unpublished trials. The main outcome indicator is the total effective rate of analgesia, and the secondary outcome indicator is pain intensity score and adverse reactions. The RevMan 5.4 software will be used for statistical analysis.Results:This study will provide the latest evidence for acupuncture combined with analgesics to relieve LC pain.Conclusion:The conclusion of this study is to evaluate the effectiveness and safety of acupuncture combined with analgesics in alleviating LC pain.INPLASY registration number:INPLASY202150051 相似文献
94.
In this study, a highly sensitive monoclonal antibody (McAb) against chloramphenicol (CAP) was successfully raised and characterised by indirect competitive enzyme-linked immunosorbent assay (ic-ELISA). Three antigens coupled with different proteins were synthesised and determined by the UV-vis method. After five rounds of immunisation, antisera were collected from six Balb/C mice and screened by ic-ELISA. The standard inhibition curve of one CAP McAb (labelled 6F11) showed the best sensitivity to CAP after optimisation of the principal working conditions. The half-maximal inhibition concentration (IC50) was calculated to be 0.01 ng/mL and the linear working range was from 0.0028 ng/mL to 0.040 ng/mL with a correlation coefficient of 0.996. This McAb showed high specificity, with negligible cross-reactivities detected towards CAP analogues (florfinicol, florfinicol amine, thiamphenicol). The recovery rate was 98.9–106.8% while the coefficient of variation was 4.45–6.05%. The IC50 value and other parameters obtained for this CAP McAb suggest that it is likely to have a promising future in further applications in combination with different analytical techniques. 相似文献
95.
OBJECTIVE: To explore whether there are extrinsic factors that impair the suppressive function of CD4+,CD25+ regulatory T cells in patients with untreated active systemic lupus erythematosus (SLE). METHODS: We studied 15 patients with untreated active SLE, 10 patients with SLE in remission, and 15 healthy control subjects. Percentages of CD4+,CD25+,FoxP3+ Treg cells and levels of forkhead box P3 (FoxP3) protein were analyzed by flow cytometry. Expression of messenger RNA (mRNA) for FoxP3 in purified Treg cell populations was assessed by real-time polymerase chain reaction analysis. Experiments examining Treg cell function in SLE were designed to distinguish primary from secondary T cell dysfunction. Levels of interferon-alpha (IFNalpha) in supernatants from the function assays were determined with an IFN-stimulated response element-luciferase reporter assay. RESULTS: The percentage of CD4+,CD25+, FoxP3+ cells in peripheral blood was significantly increased in SLE patients as compared with controls (mean +/- SEM 9.11 +/- 0.73% versus 4.78 +/- 0.43%; P < 0.0001). We found no difference in FoxP3 expression at either the mRNA or protein level in any CD4+,CD25+ T cell subset from SLE patients as compared with controls. Antigen-presenting cells (APCs) from SLE patients were responsible for decreased Treg cell activity and could also render dysfunctional Treg cells from healthy control subjects. CD4+,CD25+ Treg cells from SLE patients exhibited normal suppressive activity when cultured with APCs from healthy controls. A partial Treg cell blockade effect was induced by the high levels of IFNalpha derived from SLE patient APCs. CONCLUSION: We suggest that blockade of Treg cell-mediated suppression by IFNalpha-producing APCs in SLE patients may contribute to a pathogenic loss of peripheral tolerance in this disease. 相似文献
96.
Fereydoun Davatchi Farhad Shahram Ashok Kumar Yew Kuang Cheng Cheung Tak Cheong Andrea Bendrups 《International journal of rheumatic diseases》2004,7(1):38-43
Aims: Behcet's disease (BD) was originally a disease of the Silk Road. Some authors think that BD from the Silk Road is different from those seen in other countries. The aim of this study was to analyze the clinical manifestations of BD in APLAR countries, where some of them are in the Silk Road (SR) and some others not (NSR). Methods: Data from Australia (NSR), Hong Kong (NSR), India (SR), Iran (SR), and Singapore (SR) were selected and analyzed under the same protocol. Prior published data from China (SR) Japan (SR) and Korea (SR) were included in the analysis. Results: The mean age at the onset of the disease was under 30 for all countries except Japan and Singapore. The male gender was more frequent except in Australia and Korea. Oral aphthosis was the most frequent manifestation (90–100%). Genital aphthosis was less frequent (57–82%). Skin manifestations were also frequent (61–87%). Ocular manifestations were reported from 21–69% of patients. The difference was mainly due to patients’ selection bias and the low number of patients in some reports. The same was true for joint (30–87%), gastrointestinal (6–38%), neurological (2.5–29%) and vascular manifestations (5–28%). Conclusion: Despite the percentage difference among some countries, the general pattern of the disease was the same, suggesting that the minor differences seen in different parts of the world were not enough to call the disease a syndrome, or to differentiate Behcet's disease of the Silk Road from those seen in Western countries. 相似文献
97.
Chenbo Liao Xukun Zhu Wei Xie Fangmei Zeng Shihe Yi Haifeng Cheng Jiacai Kuang Yingjun Deng Taishan Cao 《RSC advances》2018,8(28):15315
To prepare a new kind of electromagnetic wave absorber, and improve the processing technology and accessional value of natural microcrystalline graphite minerals (NMGMs), reduced microcrystalline graphene oxide (rGO-M), a novel absorber with high absorption, low reflection and a wide absorption band, was prepared from NMGMs using a solvent-assisted thermal reduction method. Moreover, the as-produced rGO-M with adjustable electrical resistivity can be easily transferred into well distributed bulk materials by freeze-drying technology. These unique structures and compositions make a great contribution to the impedance match, and cause strong conductive loss and various dipole polarization effects which greatly enhance the absorption. Meanwhile, the effective bandwidths below −5 dB and −10 dB are 11.7 GHz and 3.32 GHz respectively, and the reflection loss can reach −42.68 dB. The study will be beneficial to the development of carbon resources and carbon materials research. Besides, it can provide a scientific basis for the further improvement of the comprehensive utilization and the level of deep processing technology of NMGM resources.Reduced microcrystalline graphene oxide (rGO-M), a novel absorber with high absorption, low reflection and a wide absorption band, was prepared from NMGMs using a solvent-assisted thermal reduction method. 相似文献
98.
Wen-Bin Kuang Ri-Zhen Huang Yi-Lin Fang Gui-Bin Liang Chen-Hui Yang Xian-Li Ma Ye Zhang 《RSC advances》2018,8(43):24376
A series of novel 2-chloro-3-(1H-benzo[d]imidazol-2-yl)quinoline derivatives (3a1−3d6) were designed and synthesized as antitumor agents. In vitro antitumor assay results showed that some compounds exhibited moderate to high inhibitory activities against HepG2, SK-OV-3, NCI-H460 and BEL-7404 tumor cell lines, and most compounds exhibited much lower cytotoxicities against HL-7702 normal cell line compared to 5-FU and cisplatin. In vivo antitumor assay results showed that the representative compound 3a1 exhibited effective inhibition on tumor growth in the HepG2 xenograft mouse model. Mechanistic studies suggested that 3a1 may exert antitumor activity by the up-regulation of Bax, intracellular Ca2+ release, ROS generation, p21, p27 and p53, downregulation of Bcl-2, activation of caspase-9 and caspase-3 and subsequent cleavage of PARP, and inhibition of CDK activity.A series of novel 2-chloro-3-(1H-benzo[d]imidazol-2-yl)quinoline derivatives were designed and synthesized as antitumor agents under the combination principle. The antitumor activity and mechanisms were then evaluated. 相似文献
99.
目的观察前列腺癌患者血清甲状旁腺相关蛋白(PTHrP)与病情及前列腺特异抗原(PSA)的关系。方法采用免疫放射法(IRMA)和放射免疫法(RIA)测定31例前列腺癌患者血清PTHrP、PSA和钙离子,并以50例前列腺增生症(BPH)、55例健康人和57例其它恶性肿瘤患者作对照。结果前列腺癌组血清PTHrP(4.6±4.4pmol/L)和PSA(80.0±52.6μg/L)明显高于BPH和健康组(均为P<0.01)。31例前列腺癌患者中13例(41.6%)血清PTHrP增高,这13例均属D期,其血清PTHrP水平明显高于A期(P<0.01)。21例前列腺癌伴发高钙血症(HHM)者血清PTHrP与PSA呈正相关关系(r=0.823,P<0.001)。BPH组无1例血清PTHrP增高。结论血清PTHrP与前列腺癌的病程进展有关,其含量增高表明肿瘤已属晚期 相似文献
100.
应用多学科的手段,包括形态度量,对宿主的致病性和病理,组织化学,单克隆抗体检测,DNA杂交,酶电泳分析等,从细胞水平到分子水平的不同层次,对新疆克拉玛依地区大沙鼠体内的利什曼原虫进行了研究;首次证实了我国新疆境内的大沙鼠耳组织有都兰利什曼原虫的寄生。用生态学,寄生虫与昆虫宿主的相容性等方法,确定了都兰利什曼原虫的传播媒介为蒙古白蛉和安氏白蛉,并从硕大白蛉吴氏亚种体内查见婴儿利什原虫,本文初步讨论了 相似文献