全文获取类型
收费全文 | 45653篇 |
免费 | 4456篇 |
国内免费 | 3637篇 |
专业分类
耳鼻咽喉 | 386篇 |
儿科学 | 480篇 |
妇产科学 | 622篇 |
基础医学 | 5477篇 |
口腔科学 | 1007篇 |
临床医学 | 5968篇 |
内科学 | 6824篇 |
皮肤病学 | 513篇 |
神经病学 | 2380篇 |
特种医学 | 1720篇 |
外国民族医学 | 20篇 |
外科学 | 4780篇 |
综合类 | 7796篇 |
现状与发展 | 15篇 |
一般理论 | 6篇 |
预防医学 | 3073篇 |
眼科学 | 1210篇 |
药学 | 4669篇 |
29篇 | |
中国医学 | 2835篇 |
肿瘤学 | 3936篇 |
出版年
2024年 | 159篇 |
2023年 | 714篇 |
2022年 | 1867篇 |
2021年 | 2328篇 |
2020年 | 1781篇 |
2019年 | 1485篇 |
2018年 | 1613篇 |
2017年 | 1481篇 |
2016年 | 1366篇 |
2015年 | 2023篇 |
2014年 | 2564篇 |
2013年 | 2199篇 |
2012年 | 3206篇 |
2011年 | 3507篇 |
2010年 | 2126篇 |
2009年 | 1751篇 |
2008年 | 2243篇 |
2007年 | 2302篇 |
2006年 | 2270篇 |
2005年 | 2068篇 |
2004年 | 1710篇 |
2003年 | 1820篇 |
2002年 | 1633篇 |
2001年 | 1386篇 |
2000年 | 1223篇 |
1999年 | 1317篇 |
1998年 | 880篇 |
1997年 | 808篇 |
1996年 | 639篇 |
1995年 | 584篇 |
1994年 | 510篇 |
1993年 | 260篇 |
1992年 | 348篇 |
1991年 | 289篇 |
1990年 | 272篇 |
1989年 | 221篇 |
1988年 | 212篇 |
1987年 | 175篇 |
1986年 | 147篇 |
1985年 | 91篇 |
1984年 | 76篇 |
1983年 | 33篇 |
1982年 | 18篇 |
1981年 | 15篇 |
1980年 | 14篇 |
1979年 | 6篇 |
1978年 | 2篇 |
1970年 | 1篇 |
1969年 | 1篇 |
1964年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
目的 探讨3种内镜治疗方式(透壁穿刺引流、经乳头胰管支架引流及联合引流)对胰管断裂综合征复发的影响。方法 收集2018年1月至2022年12月北京协和医院消化内科收治的确诊为胰管断裂综合征并行内镜下治疗的患者22例。通过回顾患者病历资料以及对患者进行电话随访,记录患者的临床特征、影像学特征、引流方式、并发症、治疗效果等。结果 22例患者共有27例次内镜治疗事件,根据操作方式分为3组:囊肿透壁穿刺引流组11例次,经乳头胰管支架引流组8例次,联合引流组8例次。联合引流组引流成功率100.0%(8/8),明显高于经乳头胰管支架引流组的50.0%(4/8)(P=0.012),但与透壁穿刺引流组的90.9%(10/11)相比,差异无统计学意义(P=0.621)。联合引流组的1年复发率0.0%(0/8),显著低于单纯透壁穿刺引流组的55.6%(5/9)(P=0.018),而且低于经乳头胰管支架引流组的42.9%(3/7),但差异无统计学意义(P=0.085)。3组的临床症状缓解率分别为45.5%(5/11)、75.0%(6/8)和87.5%(7/8),差异无统计学意义(H=3.890,P=0.143),操作并发症发生率分别为54.5%(6/11)、75.0%(6/8)和25.0%(2/8),差异无统计学意义(H=3.909,P=0.142)。结论 囊肿透壁穿刺引流联合胰管支架置入可在短期内获得满意的囊液引流效果,并显著减少1年复发。 相似文献
992.
Guoling Li Ming Jin Zhifang Li Qingquan Xiao Jiajia Lin Dong Yang Yuanhua Liu Xing Wang Long Xie Wenqin Ying Haoqiang Wang Erwei Zuo Linyu Shi Ning Wang Wanjin Chen Chunlong Xu Hui Yang 《The Journal of clinical investigation》2023,133(3)
Approximately 10% of monogenic diseases are caused by nonsense point mutations that generate premature termination codons (PTCs), resulting in a truncated protein and nonsense-mediated decay of the mutant mRNAs. Here, we demonstrate a mini-dCas13X–mediated RNA adenine base editing (mxABE) strategy to treat nonsense mutation–related monogenic diseases via A-to-G editing in a genetically humanized mouse model of Duchenne muscular dystrophy (DMD). Initially, we identified a nonsense point mutation (c.4174C>T, p.Gln1392*) in the DMD gene of a patient and validated its pathogenicity in humanized mice. In this model, mxABE packaged in a single adeno-associated virus (AAV) reached A-to-G editing rates up to 84% in vivo, at least 20-fold greater than rates reported in previous studies using other RNA editing modalities. Furthermore, mxABE restored robust expression of dystrophin protein to over 50% of WT levels by enabling PTC read-through in multiple muscle tissues. Importantly, systemic delivery of mxABE by AAV also rescued dystrophin expression to averages of 37%, 6%, and 54% of WT levels in the diaphragm, tibialis anterior, and heart muscle, respectively, as well as rescued muscle function. Our data strongly suggest that mxABE-based strategies may be a viable new treatment modality for DMD and other monogenic diseases. 相似文献
993.
Yeon-Sook Kim Seng-Ho Jeon Junghee Kim Jong Hoon Koh Seung Won Ra Ji Won Kim Yeonjae Kim Choon Kwan Kim Yun Chul Shin Beo Deul Kang Seung ji Kang Chul Hee Park Boyoung Lee Ji Yeon Lee Chung Hoon Lee Jae-phil Choi Jin Yong Kim Shi Nae Yu Kyong Ran Peck Sung-Han Kim Jung Yeon Heo Hyun ah Kim Hyun-jin Park Jongwon Choi Jumi Han JooHyun Kim Hyoung jun Kim Se Hee Han Aeri Yoon MiHee Park SuJung Park YuKyung Kim Minji Jung Myoung-don Oh 《Antimicrobial agents and chemotherapy》2023,67(1)
994.
目的 评价99Tcm-甲苯磺酸钠烟酰胺腙聚乙二醇双环精氨酸-甘氨酸-天冬氨酸肽(简称99Tcm-3PRGD2) SPECT/CT显像对不摄碘进展性放射性碘难治性分化型甲状腺癌(RAIR-DTC)的诊断效能。 方法 前瞻性选择2019年10月至2022年5月在福建省立医院行99Tcm-3PRGD2 SPECT/CT检查的59例RAIR-DTC患者,其中男性17例、女性42例,中位年龄为51(28,80)岁。所有患者均行99Tcm-3PRGD2 SPECT/CT显像,其中22例接受酪氨酸激酶抑制剂(TKI)治疗,37例接受促甲状腺激素(TSH)抑制治疗(13例在2周内接受了18F-FDG PET/CT显像)。取每例患者最大病灶的最大标准化摄取值(SUVmax)进行分析。采用ROC曲线评估99Tcm-3PRGD2 SPECT/CT显像的诊断效能并计算99Tcm-3PRGD2 SPECT/CT显像检出RAIR-DTC病灶的SUVmax临界值;采用Pearson相关分析法分析病灶长径(TL)、刺激性甲状腺球蛋白(sTg)水平与SUVmax的相关性;采用配对t检验比较分析RAIR-DTC患者TKI治疗前后sTg水平、SUVmax、TL间的关系;采用Spearman分析法分析99Tcm-3PRGD2 SPECT/CT显像与18F-FDG PET/CT显像在检出阳性病灶的SUVmax之间的关系。 结果 59例RAIR-DTC患者的276个病灶被纳入分析,其中TKI治疗前后对比病灶59个。99Tcm-3PRGD2 SPECT/CT显像对RAIR-DTC病灶诊断的灵敏度和特异度分别为94.9% (95%CI:90.7%~97.3%)和88.7%(95%CI:77.5%~95.0%)。ROC曲线结果显示,99Tcm-3PRGD2 SPECT/CT显像检出RAIR-DTC病灶的SUVmax临界值为2.70。Pearson相关分析结果显示,靶病灶的SUVmax与sTg水平、TL均呈正相关(r=0.811、0.635,均P=0.001)。22例患者经TKI治疗后,RAIR-DTC病灶的SUVmax显著降低(t=11.027,P=0.001)。Spearman相关分析结果显示,99Tcm-3PRGD2 SPECT/CT显像与18F-FDG PET/CT显像在检出阳性病灶的SUVmax间呈正相关(r=0.560,P=0.001),且ROC曲线分析结果显示,99Tcm-3PRGD2 SPECT/CT显像对RAIR-DTC病灶的诊断效能与18F-FDG PET/CT显像的差异无统计学意义(Z=0.312,P=0.753)。 结论 99Tcm-3PRGD2 SPECT/CT显像对不摄碘进展性RAIR-DTC的诊断具有较高的灵敏度和特异度,与18F-FDG PET/CT显像相似。 相似文献
995.
996.
ObjectiveEndometrial cancer (EC) is a common gynecological malignant tumor. CircRNAs play crucial roles in cancer progression and metastasis. However, the biological functions of circRNAs in EC remain largely unknown.MethodsCircSMAD2, miR-1277-5p, MFGE8 and relative maker protein expression in EC tissues or cell lines were analyzed by quantitative real-time polymerase chain reaction and Western blot. In vitro and in vivo functional assays, including EDU, CCK8, colony formation, transwell, tube formation and tumor xenograft assays, were conduct to explore the effects of circSMAD2 on EC. Mechanism assays were conducted to confirm the binding between miR-1277-5p and circSMAD2 or MFGE8 expression.ResultsUpregulation of circSMAD2 was uncovered in both EC tissues and cell lines. Functionally, silencing of circSMAD2 apparently inhibited the proliferation, migration, invasion and angiogenesis of EC cell lines in vitro. Mechanistically, circSMAD2 sponged miR-1277-5p to upregulate MFGE8 expression. The decrease of miR-1277-5p and increase of MFGE8 were observed both in EC tissues and cell lines. Then MFGE8 knockdown or miR-1277-5p upregulation suppressed EC cell oncogenic biological behavior. Rescue experiments showed that miR-1277-5p mimics countervailed the anticancer effects of circSMAD2 silencing on EC. Besides that, MFGE8 overexpression also attenuated the inhibitory action of miR-1277-5p mimic in EC. Moreover, knockdown of circSMAD2 inhibited EC growth in vivo.ConclusionCircSMAD2 functions as an oncogene in promoting the progression of EC through miR-1277-5p/MFGE8 axis. 相似文献
997.
Miloje Savic Yolanda Penders Ting Shi Angela Branche JeanYves Piron 《Influenza and other respiratory viruses》2023,17(1)
BackgroundRespiratory syncytial virus (RSV)‐associated acute respiratory infection (ARI) is an underrecognized cause of illness in older adults. We conducted a systematic literature review and meta‐analysis to estimate the RSV disease burden in adults ≥60 years in high‐income countries.MethodsData on RSV‐ARI and hospitalization attack rates and in‐hospital case fatality rates (hCFR) in adults ≥60 years from the United States, Canada, European countries, Japan, and South Korea were collected based on a systematic literature search (January 1, 2000–November 3, 2021) or via other methods (citation search, unpublished studies cited by a previous meta‐analysis, gray literature, and an RSV‐specific abstract booklet). A random effects meta‐analysis was performed on estimates from the included studies.ResultsTwenty‐one studies were included in the meta‐analysis. The pooled estimates were 1.62% (95% confidence interval [CI]: 0.84–3.08) for RSV‐ARI attack rate, 0.15% (95% CI: 0.09–0.22) for hospitalization attack rate, and 7.13% (95% CI: 5.40–9.36) for hCFR. In 2019, this would translate into approximately 5.2 million cases, 470,000 hospitalizations, and 33,000 in‐hospital deaths in ≥60‐year‐old adults in high‐income countries.ConclusionsRSV disease burden in adults aged ≥60 years in high‐income countries is higher than previously estimated, highlighting the need for RSV prophylaxis in this age group. 相似文献
998.
The purpose of this study was to investigate the effect of cold atmospheric plasma (CAP) treatment on resin nanoceramic (RNC) surface state and its bond strength with resin cement. RNC with different surface treatments were prepared: control, sandblasting treatment (SB), hydrofluoric acid etching (HF) and plasma treatment of helium gas (CAP-He) and argon gas (CAP-Ar). The prepared samples were measured by SEM, Ra, Rz, contact angle goniometer, and XPS for surface characteristics. The shear bond test of RNC was examined in nine groups: SB + saline coupling agent (SL), HF + SL, CAP-He/Ar, CAP-He/Ar + SL, SB + CAP-He/Ar + SL, and control. The bond strength between RNC and resin cement was compared using shear bond strength test, before and after thermocycling. After CAP irradiation, the surface topography maintained, while the surface water contact angle was significantly reduced to 10.18° ± 1.36° (CAP-He) and 7.58° ± 1.79° (CAP-Ar). The removal of carbon contamination and inducing of oxygen radicals was detected after CAP treatment. The bond strength was improved by CAP treatment, but varied on CAP gas species and combination methods. CAP of Ar gas had better SBS than He gas. After thermocycling, CAP-Ar + SL showed the maximized shear bond strength (32.38 ± 1.42 MPa), even higher than SB + SL group (30.08 ± 2.80 MPa, p < 0.05). In conclusion, CAP treatment of helium and argon can improve the bonding properties of RNC by improving surface wettability, and CAP of argon gas combined with silane coupling agent shows the highest bond strength. 相似文献
999.
饮片为传统中药的主要应用形式,是中医临床的处方药的组成原料。中药材凡是经过炮制,无论是否加热都称为制饮片,制饮片又有生、熟饮片的区别。基于生制饮片在临床应用的差异性,本文从中药炮制生熟理论、辅料作用论、制药论等传统中药炮制传统理论着手,重点解析炮制如何影响中药的药性,包括中药的四气五味、升降浮沉、归经,补泻、毒性等,依据炮制前后药效物质基础及药理作用的变化实例,诠释炮制使中药药性改变的作用机制。 相似文献
1000.
目的:本文旨在了解浙江省老年人中医药服务的使用情况,并从教育程度、经济状况、健康状态、对中医的态度、健康知信行等角度分析老年人中医就诊行为的影响因素。方法:采用横断面研究方法,分层抽样设计,对浙江省辖区内55 岁以上的老年人进行问卷调查。调查内容包括:①基本信息:性别、年龄、文化程度、养老模式、医疗保障情况、自评价经济水平;②健康状态:自评价健康水平、现患疾病情况;③对中医的态度:“您是否愿意接受中医健康服务?”;④健康知信行:自制KAB问卷,包括健康知识、健康态度、健康行为3个维度。结果:针对老年人发放问卷950份,回收有效问卷945份。其中男性484例,女性461例。平均年龄为72.0±8.9岁。教育程度总体偏低,以初中及以下为主(88.3%)。仅50.11%老年人在过去1年内有中医就诊行为。总体而言,年龄、性别、文化程度、养老模式、健康行为对中医就诊行为无明显影响,1年内有中医就诊行为的老年人具有对中医接受度相对较高、经济水平相对较好、健康水平较差、患病率较高、健康知识及态度较好等特征。结论:中医服务在浙江省老年人群中的利用率不高,原因可能在于老年人对中医的接受度不够,缺乏市场竞争力等。因此,应加大中医药服务宣传力度,拓宽中医药服务项目,以满足老年人群的健康需求,提高中医药服务使用率,使其在老龄化社会中发挥重要作用。 相似文献