全文获取类型
收费全文 | 58006篇 |
免费 | 5139篇 |
国内免费 | 2335篇 |
专业分类
耳鼻咽喉 | 477篇 |
儿科学 | 1329篇 |
妇产科学 | 881篇 |
基础医学 | 6122篇 |
口腔科学 | 1190篇 |
临床医学 | 5915篇 |
内科学 | 10211篇 |
皮肤病学 | 798篇 |
神经病学 | 3459篇 |
特种医学 | 1990篇 |
外国民族医学 | 4篇 |
外科学 | 7597篇 |
综合类 | 7209篇 |
现状与发展 | 3篇 |
一般理论 | 16篇 |
预防医学 | 4453篇 |
眼科学 | 1772篇 |
药学 | 5562篇 |
28篇 | |
中国医学 | 1885篇 |
肿瘤学 | 4579篇 |
出版年
2024年 | 128篇 |
2023年 | 579篇 |
2022年 | 1257篇 |
2021年 | 1886篇 |
2020年 | 1431篇 |
2019年 | 1484篇 |
2018年 | 1565篇 |
2017年 | 1413篇 |
2016年 | 1403篇 |
2015年 | 1788篇 |
2014年 | 2429篇 |
2013年 | 2667篇 |
2012年 | 3853篇 |
2011年 | 3947篇 |
2010年 | 2694篇 |
2009年 | 2436篇 |
2008年 | 3261篇 |
2007年 | 3316篇 |
2006年 | 3083篇 |
2005年 | 2730篇 |
2004年 | 2998篇 |
2003年 | 3180篇 |
2002年 | 2861篇 |
2001年 | 2470篇 |
2000年 | 1790篇 |
1999年 | 1301篇 |
1998年 | 529篇 |
1997年 | 459篇 |
1996年 | 345篇 |
1995年 | 346篇 |
1994年 | 312篇 |
1993年 | 221篇 |
1992年 | 591篇 |
1991年 | 544篇 |
1990年 | 514篇 |
1989年 | 445篇 |
1988年 | 392篇 |
1987年 | 370篇 |
1986年 | 363篇 |
1985年 | 342篇 |
1984年 | 230篇 |
1983年 | 217篇 |
1982年 | 144篇 |
1981年 | 108篇 |
1980年 | 112篇 |
1979年 | 165篇 |
1978年 | 94篇 |
1977年 | 105篇 |
1974年 | 87篇 |
1973年 | 71篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
经内镜鼻胰管引流在重症急性胰腺炎治疗中的应用 总被引:3,自引:1,他引:2
目的 :初步总结经内镜鼻胰管引流在重症急性胰腺炎治疗中应用的疗效。 方法 :自 1998年 3月以来 ,在重症急性胰腺炎患者入院后常规非手术监测治疗的同时 ,随机床旁行经内镜置放鼻胰管引流 14例。其中明确合并胆结石 8例。观察每天胰管引流量和入院后第 5天在体温、心率、白细胞计数、血糖、血钙、动脉氧分压和血、尿淀粉酶的变化 ,并与第 1天比较 ,记录治疗结果和住院时间。 结果 :经鼻胰管引流时间为 (7.3± 4 .0 )天 ,前 5天的胰液引流量分别为每天 (2 36 .4± 176 .6 )、(2 87.1± 16 4 .7)、(2 84 .6± 2 16 .4 )、(435 .0± 35 7.8)ml和 (377.8± 2 2 3.8)ml。入院后第 1天和第 5天的体温为 (38.2± 0 .6 )和 (37.2± 0 .8)℃ (P <0 .0 1)、心率为 (10 2 .3± 17.0 )和 (82 .9± 14 .5 )次 /min(P <0 .0 1) ,白细胞计数为 (14 .6± 4 .2 )和 (10 .1± 5 .4 )× 10 9/L(P <0 .0 5 ) ,血糖为 (10 .0± 4 .9)和 (8.6± 3.3)mmol/L(P >0 .0 5 ) ,血钙为 (2 .1± 0 .2 )和 (2 .2± 0 .2 )mmol/L(P >0 .0 5 ) 动脉氧分压为 (78.0± 16 .3)和 (113.0± 4 1.6 )mmHg(P <0 .0 1) ,血淀粉酶为 (6 95 .7± 4 4 5 .2 )和 (82 .6± 4 7.1)U/L(P <0 .0 1) ,尿淀粉酶为 (3174 .1± 2 5 4 2 .5 )和(2 86 .8± 2 相似文献
52.
53.
在动物实验的基础上,比较了抗AFP单克隆抗体(mAb)和抗AFP多克隆抗体(pAb)两种不同抗体双弹头标记物在肝癌患者体内的生物代谢情况。结果显示,两种抗体标记物的血浆清除半衰期均在24h左右,mAb标记物的清除较pAb标记物略慢。尿清除的半衰期,mAb标记物约为120h,而pAb标记物则约为18h,表明二者的体内生物代谢不同,疗效可能不一。 相似文献
54.
蜂王浆冻干粉对小鼠肿瘤的抑制作用 总被引:4,自引:0,他引:4
目的研究蜂王浆冻干粉对小鼠肿瘤的抑制作用.方法按每公斤体重0g、0.25g、0.50g、0.75g设对照及低、中、高3个剂量组,经口给予蜂王浆冻干粉30d后,接种小鼠肉瘤180(S180)和艾氏癌腹水型(EAC)两个瘤种.结果在两次重复的小鼠S180和EAC抑瘤试验中发现中剂量组瘤重明显低于阴性对照组(P<0.05),抑制率可达34%;中剂量组荷瘤小鼠平均生存时间均明显高于对照组(P<0.05).结论蜂王浆冻干粉具有抑制肿瘤的作用. 相似文献
55.
The doubly labelled water method was used to estimate energy expenditure in 20 formula-fed infants (10 aged 1 month and 10 aged 4 months). We then compared the energy expenditure values with energy balance values calculated from energy intake and energy cost of growth. Our purpose was to compare various published equations for calculating CO2 expiration rates (and thus energy expenditure values) from the isotopic data. Those equations in which we used measured values for 18O and 2H isotope dilution spaces and estimated or measured values for insensible water losses yielded energy expenditure values (69.7 +/- 8.4 kcal/kg/d) that agreed most closely with energy balance data (70.3 +/- 11.9 kcal/kg/d). Equations in which we used a constant ratio of 1.03 between the 2H and 18O isotope dilution spaces resulted in energy expenditure values (66.3 +/- 10.2 kcal/kg/d) lower than those predicted by the energy balance data. Data analysis by nonlinear curve fitting compared to logarithmic transformation did not alter the estimates of energy expenditure obtained in these infants. 相似文献
56.
S G Wong 《Journal of the American Optometric Association》1988,59(8):594-597
For a number of years, optometrists have had informal working and referral relationships with many hospitals. Many hospitals were requesting diagnostic and treatment services from community optometrists while many optometrists were also requesting official recognition. With changes in the medical staff standard of the Joint Commission on Accreditation of Hospitals (JCAH)a that allowed independently licensed practitioners to be on staff, a number of optometrists have been requesting clinical privileges and to be on the Medical Staff. Practicing in a hospital can augment one's practice and can allow the optometrist greater opportunities to interact with other professionals and utilize the hospital's diagnostic facilities. 相似文献
57.
Contact angles of substances used for internal tamponade in retinal detachment surgery 总被引:4,自引:0,他引:4
I. M. Fawcett R. L. Williams D. Wong 《Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie》1994,232(7):438-444
In order to ascertain the tamponade effect of air and silicone oil we examined the contact angles subtended by ex vivo human retina, Teflon and Perspex to find a suitable experimental material which would mimic the surface properties of the retina at a three-phase interface. Using the captive bubble technique to measure the contact angle, it was found that air subtended a larger contact angle (38.8°) with the retina than did silicone oil (18.2°). On coating the Perspex surface with protein (PCP), it was observed that the surface properties were modified such that PCP subtended contact angles with air (43.0°) and silicone oil (16.4°) similar to those subtended by ex vivo human retina. Using PCP as an experimental material that mimics ex vivo human retina, spherical chambers were employed in order to examine qualitatively and to quantify the arc of contact obtained with air and silicone oil. It was found that air gave a greater arc of contact for the same percentage fill than silicone oil. 相似文献
58.
59.
60.
Surgical treatment of brain metastases from renal cell carcinoma 总被引:1,自引:0,他引:1
R A Badalament R W Gluck G Y Wong C Gnecco E Kreutzer H W Herr W R Fair J H Galicich 《Urology》1990,36(2):112-117
Between January 1976 and December 1986, 22 patients with renal cell carcinoma underwent surgical resection of brain metastases at Memorial Sloan-Kettering Cancer Center. Ten of the patients had metastases limited to the brain and 12 also had extracranial metastases. Twenty patients received external radiotherapy. Five had craniotomy after failing radiation therapy and 15 had adjuvant radiotherapy. Two patients died within thirty days following craniotomy; the median survival of the remaining 20 patients was 20.9 +/- 6.8 months calculated according to a Weibull survival model. Variables examined in relation to survival included absence or presence of extracranial metastases at time of craniotomy, time interval between nephrectomy and diagnosis of cerebral metastases, neurologic status prior to craniotomy, location of the brain tumor, and patient age. None of the variables was significant at the 10 percent level by the Weibull analysis. However, three favorable prognostic factors, namely metachronous brain metastasis more than one year after nephrectomy, minimal or no neurologic deficit at time of craniotomy, and infratentorial lesions show a trend toward improved survival with p less than 0.20. The data suggest that surgical resection of a single and occasionally multiple brain metastases is warranted in selected patients with renal cell carcinoma. 相似文献