全文获取类型
收费全文 | 15028篇 |
免费 | 1054篇 |
国内免费 | 257篇 |
专业分类
耳鼻咽喉 | 305篇 |
儿科学 | 359篇 |
妇产科学 | 1490篇 |
基础医学 | 1749篇 |
口腔科学 | 244篇 |
临床医学 | 1247篇 |
内科学 | 1301篇 |
皮肤病学 | 234篇 |
神经病学 | 664篇 |
特种医学 | 255篇 |
外国民族医学 | 6篇 |
外科学 | 1267篇 |
综合类 | 2749篇 |
现状与发展 | 2篇 |
一般理论 | 9篇 |
预防医学 | 1626篇 |
眼科学 | 258篇 |
药学 | 1234篇 |
11篇 | |
中国医学 | 730篇 |
肿瘤学 | 599篇 |
出版年
2024年 | 23篇 |
2023年 | 179篇 |
2022年 | 258篇 |
2021年 | 509篇 |
2020年 | 533篇 |
2019年 | 477篇 |
2018年 | 433篇 |
2017年 | 554篇 |
2016年 | 569篇 |
2015年 | 477篇 |
2014年 | 962篇 |
2013年 | 1154篇 |
2012年 | 896篇 |
2011年 | 984篇 |
2010年 | 816篇 |
2009年 | 722篇 |
2008年 | 689篇 |
2007年 | 735篇 |
2006年 | 707篇 |
2005年 | 605篇 |
2004年 | 519篇 |
2003年 | 442篇 |
2002年 | 357篇 |
2001年 | 313篇 |
2000年 | 279篇 |
1999年 | 213篇 |
1998年 | 190篇 |
1997年 | 151篇 |
1996年 | 182篇 |
1995年 | 177篇 |
1994年 | 140篇 |
1993年 | 108篇 |
1992年 | 105篇 |
1991年 | 103篇 |
1990年 | 76篇 |
1989年 | 75篇 |
1988年 | 60篇 |
1987年 | 57篇 |
1986年 | 50篇 |
1985年 | 84篇 |
1984年 | 83篇 |
1983年 | 56篇 |
1982年 | 58篇 |
1981年 | 46篇 |
1980年 | 35篇 |
1979年 | 22篇 |
1978年 | 22篇 |
1977年 | 15篇 |
1976年 | 16篇 |
1972年 | 4篇 |
排序方式: 共有10000条查询结果,搜索用时 488 毫秒
41.
Boerhaave’s syndrome: Primary repair vs. esophageal resection—Case reports and meta-analysis of the literature 总被引:3,自引:0,他引:3
Otto Kollmar M.D. Werner Lindemann M.D. Sven Richter M.D. Ingo Steffen M.D. Georg Pistorius M.D. Martin K. Schilling M.D. 《Journal of gastrointestinal surgery》2003,7(6):726-734
Boerhaave’s syndrome is a life-threatening disease with a high mortality. With regard to the heterogeneity of treatment strategies,
no comparative studies exist and recommendations remain controversial. Seventeen cases of Boerhaave’s syndrome operated on
between 1989 and 2000 at our hospital were reviewed retrospectively to compare the time period between perforation and diagnosis,
and the morbidity and mortality among the different treatment options. In addition, we conducted a meta-analysis of the literature
including all series containing five or more patients and compared the findings with our own data. Our patients with a perforation
history of less than 12 hours showed significantly fewer signs of sepsis compared to patients with a history of more than
12 hours. In a comparison of patients with primary repair vs. patients treated with esophageal resection or an exclusion operation,
no differences were found. In the literature, patients with a long period of perforation (more than 24 hours) were treated
more often with an esophageal resection than patients with primary repair. In cases of Boerhaave’s syndrome, primary suturing
of the esophageal perforation should be reserved only for those patients presenting within 12 hours after perforation. In
all other cases, depending on the extent of the tissue damage, a two-stage esophageal resection with cervical esophagostomy
and gastrostomy is recommended as the safest treatment. 相似文献
42.
自然流产患者滋养细胞肝素表皮生长因子的表达及意义 总被引:11,自引:0,他引:11
目的 探讨自然流产患者滋养细胞肝素表皮生长因子 (HB EGF)的表达及其与滋养细胞增殖细胞核抗原 (PCNA)的关系。方法 选择自然流产患者和正常妊娠者各 2 0例 ,采用免疫组织化学法分析滋养细胞HB EGF和PCNA的表达。结果 HB EGF主要存在于细胞质 ,合体滋养层和细胞滋养层均有表达 ,部分流产滋养细胞不表达。自然流产患者滋养细胞HB EGF和PCNA的表达显著低于正常妊娠者 (P <0 .0 1) ,成正相关 (r =0 .4 5 4 ,P <0 .0 1)。结论 HB EGF的表达和滋养细胞增殖相关 ,HB EGF下降可能与自然流产的发生相关 相似文献
43.
Akitoshi Yamada Yoshitaka Takeda Satoru Hayashi Kazuta Shimizu 《The Japanese Journal of Thoracic and Cardiovascular Surgery》2003,51(9):456-458
We experienced a case of familial spontaneous pneumothorax in three generations. Six of 13 family members had episodes of
spontaneous pneumothorax. It is well established that there are some diseases associated with human leukocyte antigen (HLA).
We performed HLA phenotyping for HLA of A, B and C. In our study, we detected the HLA haplotype A2, B61 in three of 4 who
had episodes of spontaneous pneumothorax. The HLA haplotype A2, B70 were also detected in three of 4 who had episodes. This
suggests that familial spontaneous pneumothorax might have hereditary factors. 相似文献
44.
人工流产(简称人流)是各种避孕失败的主要补救措施,目前早孕妇女人流的主要方式有吸刮术与药物流产两种。本文通过对天津市黄河医院意外早孕妇女选择人流方式意向的临床调查研究,探讨现阶段该两种人流方式的可接受性,结果:1000例早孕妇女中选择药物流产(简称药流)者666例(66.6%),吸刮术者334例(33.4%)。本组选择人流方式的理由,其中519例(51.9%)认为药流痛苦少,占第一位,认为手术干脆而选择吸刮术的217例(21.7%),占第二位,其它依次为吸刮术费用低、药流不必手术、吸刮术流产完全、药流不需请假、吸刮术出血时间短、药流安全、吸刮术副作用少、药流保密。药流是近年来使用的流产新方法,本组研究资料及意向选择只反映现阶段早孕妇女的接受状况。 相似文献
45.
C Yimin Y Wei C Weidong W Xianmi W Junqing L Lin 《International journal of gynaecology and obstetrics》2004,84(3):229-235
OBJECTIVES: To assess the effect of a medically induced abortion (MA) on birth weight in the first subsequent pregnancy. METHODS: Pregnant women who had had a MA, a surgical abortion (SA), or primigravidas with no history of abortion (NA), were recruited for a prospective cohort study between July 1998 and February 2001. The sample for the present analysis included 12995 singleton live births at term. RESULTS: The overall incidence rate of low birth weight (LBW) was 1.0%. The rates of LBW in the MA, SA, and NA groups were 1.0%, 0.9%, and 1.2, respectively. There were no significant differences in LBW rates between the MA and SA groups, neither between the MA and NA. Logistic regression analysis was used to estimate the effects of MA on birth weight, and we found no relationship between risk of LBW and MA. CONCLUSIONS: We did not find a statistically significant relationship between a history of one medically induced abortion and LBW for the first subsequent term pregnancy. 相似文献
46.
Leann D. Ermel Paul B. Marshburn William H. Kutteh 《American journal of reproductive immunology (New York, N.Y. : 1989)》1995,33(1):14-20
PROBLEM: To determine if heparin may act directly with antiphospholipid antibodies (APA) to prevent recurrent pregnancy loss (RPL). METHOD: Patients were seen at the University of Texas Southwestern Medical Center. Twenty women with a history of RPL (≥3 miscarriages), positive APA, and an otherwise normal evaluation were treated with heparin in two daily subcutaneous dosages during a successful pregnancy. APA levels were obtained prior to conception and again at 6, 20, and 30 weeks. RESULTS: Heparin reduced APA binding to cardiolipin and phosphatidylserine in a dose-dependent fashion in ELISA. Heparin affinity chromatography absorbed over 80% of the IgG anticardiolipin antibody in serum from women with high levels of APA. Women treated with increasing dosages of heparin during pregnancy had inversely decreasing levels of IgG anticardiolipin antibody. CONCLUSION: Heparin may act by directly binding APA in vivo, thereby decreasing the adverse effects of APA in women with APA associated RPL. 相似文献
47.
报道7例自发性食管穿孔治疗经验,并对诊断和治疗和治疗新方法进行了讨论,自发性食管穿孔早期诊断的重要依据是迅速获得完整,详细的发病史。可疑时通过食道造影,胸腔穿刺刺液的分析而确诊。一经确诊应急取早期食管修补,对发病时间长,全身情况差的病人,经积极准备后仍应急取食管修补,对不宜手术者给予食管冲洗促进穿孔愈合。同时给予有效的食管腔内外引流。 相似文献
48.
79例人流术后支原体感染分析 总被引:6,自引:0,他引:6
79例人流术后支原体感染分析陆海音,杨红英,周曾娣,张明秋,汤国民Analysisofkycoplasmasinfectionsin79womenwithinduceiabortionLuHai-yin,yangHong-yin,ZhouZeng-d... 相似文献
49.
Akira Fukushima 《Psychiatry and clinical neurosciences》1994,48(Z1):1-4
Abstract: Historical changes in forensic psychiatric evaluation on criminal responsibility and proceedings in psychopathological findings of amphetamine psychosis are reviewed at first. The classification of amphetamine related mental disorders are proposed in 6 types. Among them, the clinical characteristics and psychopathological features of “Anxiety-situational reaction type” (Fukushima) are described. According to some reasonable grounds, offenders diagnosed as anxiety-situational reaction type should be evaluated as diminished responsibility in place of irresponsibility. Finally, two cases of murder committed under the influence of amphetamine, are reported in detail. 相似文献
50.
71例初产妇前置胎盘与人工流产相关性分析 总被引:1,自引:0,他引:1
目的:探讨初孕人工流产与再孕后前置胎盘发生率的相关性。方法:对1992年1月~2001年12月住院分娩的4046例初孕人工流产进行回顾分析,对影响前置胎盘发生率的因素进行x~2检验。结果:初产妇前置胎盘发生率为1.75%;人工流产次数越多,末次人工流产术后至本次妊娠时间间隔越短;人工流产术后有生殖道感染史者,前置胎盘发生率明显增高。结论:人工流产术是前置胎盘的高危因素,应加强育龄妇女的生殖健康宣传和教育,做到有计划受孕,减少非意愿妊娠的发生。 相似文献