全文获取类型
收费全文 | 66481篇 |
免费 | 4852篇 |
国内免费 | 172篇 |
专业分类
耳鼻咽喉 | 838篇 |
儿科学 | 1886篇 |
妇产科学 | 1638篇 |
基础医学 | 10789篇 |
口腔科学 | 1728篇 |
临床医学 | 6339篇 |
内科学 | 13424篇 |
皮肤病学 | 1234篇 |
神经病学 | 6240篇 |
特种医学 | 2806篇 |
外国民族医学 | 46篇 |
外科学 | 8491篇 |
综合类 | 633篇 |
一般理论 | 84篇 |
预防医学 | 5281篇 |
眼科学 | 1222篇 |
药学 | 4742篇 |
中国医学 | 163篇 |
肿瘤学 | 3921篇 |
出版年
2022年 | 391篇 |
2021年 | 1064篇 |
2020年 | 664篇 |
2019年 | 948篇 |
2018年 | 1159篇 |
2017年 | 821篇 |
2016年 | 964篇 |
2015年 | 1142篇 |
2014年 | 1405篇 |
2013年 | 2450篇 |
2012年 | 3087篇 |
2011年 | 3176篇 |
2010年 | 2297篇 |
2009年 | 1951篇 |
2008年 | 2867篇 |
2007年 | 3041篇 |
2006年 | 3005篇 |
2005年 | 2845篇 |
2004年 | 2915篇 |
2003年 | 2653篇 |
2002年 | 2738篇 |
2001年 | 2226篇 |
2000年 | 2290篇 |
1999年 | 2070篇 |
1998年 | 962篇 |
1997年 | 800篇 |
1996年 | 722篇 |
1995年 | 734篇 |
1994年 | 615篇 |
1993年 | 651篇 |
1992年 | 1543篇 |
1991年 | 1449篇 |
1990年 | 1414篇 |
1989年 | 1408篇 |
1988年 | 1195篇 |
1987年 | 1182篇 |
1986年 | 1110篇 |
1985年 | 1004篇 |
1984年 | 763篇 |
1983年 | 694篇 |
1982年 | 493篇 |
1981年 | 476篇 |
1980年 | 404篇 |
1979年 | 655篇 |
1978年 | 404篇 |
1977年 | 385篇 |
1975年 | 396篇 |
1974年 | 436篇 |
1973年 | 385篇 |
1972年 | 365篇 |
排序方式: 共有10000条查询结果,搜索用时 392 毫秒
31.
32.
Treatment of the dumping syndrome with the somatostatin analogue SMS 201-995. 总被引:2,自引:0,他引:2
下载免费PDF全文
![点击此处可从《Annals of surgery》网站下载免费的PDF全文](/ch/ext_images/free.gif)
In six patients suffering from severe early dumping and six patients with late dumping after peptic ulcer surgery, the effect of the somatostatin analogue SMS 201-995 was compared with placebo. In early dumpers subcutaneous administration of 50 micrograms SMS 201-995 prior to meal ingestion induced a strong improvement of dumping symptoms as reflected by a decrease of the Sigstad dumping score from 12 +/- 2 during placebo to 5 +/- 2 (p less than 0.05). Furthermore, the postprandial increase of pulse rate was abolished; maximum pulse rate decreased from 85 +/- 7 beats/min to 67 +/- 7 beats/min (p less than 0.05). SMS 201-995 did not significantly affect postprandial changes in packed cell volume. In late dumpers 50 micrograms SMS 201-995 reduced peak plasma insulin after oral glucose from 173 +/- 16 mU/L during placebo to 35 +/- 9 mU/L during SMS 201-995 (p less than 0.05) and increased individual plasma glucose nadirs from 1.9 +/- 0.3 mmol/L to 7.5 +/- 3.3 mmol/L (p less than 0.01). Both in early and late dumpers SMS 201-995 improved postprandial expiratory breath hydrogen excretion indicating slowing of gastrointestinal hurry. SMS 201-995 is a powerful therapeutic agent for the management of patients suffering from the dumping syndrome after gastric surgery. 相似文献
33.
34.
Van Landeghem G; Haese P; Lamberts L; Barata J; DeBroe M 《Nephrology, dialysis, transplantation》1997,12(8):1692-1698
Background: The association between aluminium and
dialysis encephalopathy and deterioration of the neurological state during
desferrioxamine treatment of dialysis patients is well established. At
present little is known about the speciation and the mechanisms underlying
the element's neurotoxicity. Methods. Aluminium speciation was performed in
cerebrospinal fluid samples of acutely aluminium-intoxicated dialysis
patients using a recently developed high-performance liquid
chromatographic/electro-thermal atomic absorption spectrometric hybrid
method. Results: Baseline cerebrospinal fluid
aluminium levels of samples taken shortly after the intoxication were low
but elevated (5.0±2.0 &mgr;g/l, n=3) as compared to subjects
with normal renal function (<1 &mgr;g/l). In contrast to the
situation noted in serum and to the iron speciation in cerebrospinal fluid,
aluminium was not bound to transferrin but appeared as two distinct
compounds, the main fraction eluting at the elution volume of aluminium
citrate/silicate. The second compound was not identified. Forty-four hours
after desferrioxamine administration the cerebrospinal fluid aluminium
levels had increased up to a concentration of 10.3±2.5
&mgr;g/l (n=3). This was accompanied by a change in the speciation
profile with aluminium appearing at the elution volume of aluminoxamine.
Conclusion: Our findings may contribute to a better
understanding of the neurotoxic effects of aluminium and its
desferrioxamine chelate in dialysis patients. 相似文献
35.
Evolution of the sperm aster after microinjection of isolated human sperm centrosomes into meiotically mature human oocytes 总被引:3,自引:2,他引:1
This study examined the feasibility of isolating and transferringthe centrosome-containing region of spermatozoa to mature humanoocytes. The findings demonstrate that individual sperm centrosomescan be transferred and are capable of nucleating maternal tubulinto form a well-developed sperm aster in the recipient oocyte.The results are discussed with respect to centrosome functionin early human development and applications in clinical in-vitrofertilization in the treatment of certain forms of male factorinfertility. 相似文献
36.
37.
G. H. M. B. Van Rens 《Documenta ophthalmologica. Advances in ophthalmology》1988,70(2-3):205-208
The Q-switched neodymium-YAG laser was used via a transconjunctival approach to reopen a failed filtering bleb, 6 weeks after a primarily successful trabeculectomy had failed. One day after treatment, the intraocular pressure had decreased from 34 mm Hg to 17 mm Hg, and a conjunctival bleb had reformed. 相似文献
38.
目的 通过测定生长激素缺乏症 (GHD)患儿用国产重组人生长激素 (recom bined hum angrowth horm one,rh GH)治疗时血清生长激素抗体 (GH- Ab)水平及其结合特性 ,探讨 rh GH的免疫原性及其对疗效的影响。方法 对 6 1例 (男 49例 ,女 12例 ) GHD患儿用国产 rh GH治疗 ,每晚睡前皮下注射 rh GH 0 .1IU /kg共6个月 ;用放射免疫法测定治疗期间患儿血清 GH- Ab水平和滴度 ,并计算抗体结合容量、亲和常数 (Ka)。结果 48%患儿 (2 9/6 1)用药后 3个月血清 GH - Ab呈阳性至试验结束时仍未消失 ,其中 2 0例抗体为弱阳性 (结合率 <10 % ) ,9例呈强阳性 (结合率 >15 % ) ;5 2 %患儿 (32 /6 1)治疗期间抗体为阴性 ;血清 GH- Ab的结合容量、Ka及滴度均为低水平 ,分别为 (0 .1~ 4.8) pmol/L、(1.7× 10 7~ 6 .5× 10 8) L /mol和 1∶ 4~ 1∶ 8。GH- Ab阳性患儿治疗后的身高、身高增长速率及身高落后于正常 SD值的变化与同期阴性者比较无统计学差异 (P>0 .0 5 )。结论 本试验所用国产 rh GH对 GHD患儿身高增长具有确切的促进作用 ,其免疫原性所导致产生的 GH - Ab未对患儿体格线性增长产生负性影响 相似文献
39.
T F Kruger J P Van der Merwe H J Odendaal F S Stander G M Grobler V A Hulme E L Erasmus K Coetzee M L Windt Y Swart 《Suid-Afrikaanse tydskrif vir geneeskunde》1990,77(12):634-636
The results of the in vitro fertilisation programme at Tygerberg Hospital for the period April 1983 to January 1988 are presented. Of the 1117 laparoscopies performed, 825 patients reached the transfer stage. A live-birth rate of 9.3% was achieved. The pregnancy rate after transfer of 4 embryos was 25.9% compared with 15.4% after 2 embryos and 10.8% after 3 embryos (P = less than 0.0001). The multiple pregnancy rate was 2.8% in the group receiving 2 embryos and 11.7% and 10.4% in those receiving 3 and 4 embryos, respectively. Of the 77 successful pregnancies (90 babies), 1 baby died at 34 weeks' gestation as the result of abruptio placentae due to preeclampsia and 1 cot death occurred. The only congenital abnormality encountered was a cleft palate. 相似文献
40.
J Komen P J Van den Dobbelsteen W J Slierendrecht W B Van Muiswinkel 《Transplantation》1990,49(4):788-793
The fate of skin allografts exchanged among heterozygous and homozygous gynogenetic common carp siblings, and among newly developed inbred strains and F1 hybrids, is described. Heterozygous gynogenetic offspring were produced by fertilizing eggs with UV-irradiated sperm and by treating the resulting zygote with a cold shock (0 degree C, 45 min). The temperature shock causes retention of the second polar body, which allows the eggs to develop into normal diploid fry. Homozygous gynogenetic offspring were similarly produced by using a heat shock (40 degrees C, 2 min), which suppresses the first mitotic division. Skin allografts exchanged among heterozygous gynogenetic carp exhibited prolonged survival, with some allografts (21.8%) surviving for over 28 days. Furthermore, a strong histocompatibility locus was seen to segregate in this group. In contrast, skin allografts exchanged among homozygous gynogenetic siblings were all rejected within 14 days (MST 9.4 days). New homozygous inbred strains, designated JJ and MM, were produced by gynogenetic reproduction of homozygous female carps, while F1 hybrids were produced by crossing of these homozygous females with homozygous male siblings. All grafts exchanged among members of the same strain were permanently accepted. Likewise grafts from homozygous strain members were accepted by fish from the related F1-hybrids, while the reverse grafts were rejected. These results provide evidence for the idea that in the carp histocompatibility genes exist at least one major locus and multiple minor loci, which are codominantly expressed. 相似文献