全文获取类型
收费全文 | 536篇 |
免费 | 36篇 |
国内免费 | 6篇 |
专业分类
耳鼻咽喉 | 3篇 |
儿科学 | 11篇 |
妇产科学 | 8篇 |
基础医学 | 92篇 |
口腔科学 | 37篇 |
临床医学 | 50篇 |
内科学 | 83篇 |
皮肤病学 | 5篇 |
神经病学 | 35篇 |
特种医学 | 36篇 |
外国民族医学 | 5篇 |
外科学 | 92篇 |
综合类 | 9篇 |
预防医学 | 52篇 |
眼科学 | 3篇 |
药学 | 21篇 |
中国医学 | 2篇 |
肿瘤学 | 34篇 |
出版年
2022年 | 5篇 |
2021年 | 18篇 |
2020年 | 11篇 |
2019年 | 16篇 |
2018年 | 16篇 |
2017年 | 8篇 |
2015年 | 11篇 |
2014年 | 8篇 |
2013年 | 8篇 |
2012年 | 26篇 |
2011年 | 19篇 |
2010年 | 15篇 |
2009年 | 20篇 |
2008年 | 18篇 |
2007年 | 15篇 |
2006年 | 18篇 |
2005年 | 18篇 |
2004年 | 25篇 |
2003年 | 15篇 |
2002年 | 16篇 |
2001年 | 12篇 |
2000年 | 10篇 |
1999年 | 8篇 |
1998年 | 15篇 |
1997年 | 20篇 |
1996年 | 24篇 |
1995年 | 11篇 |
1994年 | 10篇 |
1993年 | 9篇 |
1992年 | 5篇 |
1991年 | 14篇 |
1990年 | 7篇 |
1989年 | 16篇 |
1988年 | 15篇 |
1987年 | 12篇 |
1986年 | 9篇 |
1985年 | 3篇 |
1984年 | 5篇 |
1983年 | 6篇 |
1982年 | 6篇 |
1981年 | 5篇 |
1980年 | 9篇 |
1979年 | 7篇 |
1977年 | 3篇 |
1974年 | 3篇 |
1967年 | 3篇 |
1932年 | 2篇 |
1928年 | 2篇 |
1924年 | 2篇 |
1923年 | 2篇 |
排序方式: 共有578条查询结果,搜索用时 31 毫秒
1.
2.
Michael W. Manning Yi-Ju Li Dean Linder John C. Haney Yi-Hung Wu Mihai V. Podgoreanu Madhav Swaminathan Jacob N. Schroder Carmelo A. Milano Ian J. Welsby Mark Stafford-Smith Kamrouz Ghadimi 《Journal of cardiothoracic and vascular anesthesia》2021,35(5):1310-1318
- Download : Download high-res image (215KB)
- Download : Download full-size image
3.
4.
5.
de Boer A; Schroder C; Reddingius R; Willems H; Monnens L 《Nephrology, dialysis, transplantation》1998,13(9):2348-2350
Background: The passage of proteins across the
glomerular filtration barrier is mainly determined by the size of the
protein. In nephrotic syndrome (NS) the glomerular permselectivity is
affected, causing proteinuria. Some authors suggest the existence of a
generalized basement membrane defect. The permeability characteristics of
the peritoneal basement membrane in children with NS are not known.
Methods: The transperitoneal transport of proteins
with a different molecular weight ({beta}2-microglobulin MW 11 800 D,
albumin MW 69 000 D, IgG MW 160 000 D, and &agr;2-macroglobulin MW 820
000 D) was studied in a study group (group A) consisting of six stable
nephrotic children (three with glomerulosclerosis and three with congenital
nephrotic syndrome, one of them with mesangial sclerosis) and compared to a
control group (group B) consisting of eight stable children on peritoneal
dialysis. After a dwell of 6 h with Dianeal 1.36% dialysate and serum
samples were collected. For each patient the dialysate to plasma (D/P)
ratio of the four proteins were calculated. The D/P ratios of the nephrotic
patients in group A were compared to the D/P ratios of the patients in the
control group B. Data were expressed as mean ±SD.
Results: The values for the D/P ratios (in percentage)
of {beta}2-microglobulin, albumin, IgG and &agr;2-macroglobulin in
group A were 19.6±9.9, 2.7±1.7, 1.6±0.9,
and 0.5±0.4, compared to 24.9±10.2,
4.0±2.3, 2.2±1.2, and 0.7±0.3 in the
control group B. The ratios were plotted against MW on a double logarithmic
scale. In all patients a linear relationship between molecular weight and
D/P ratio of the proteins was obtained. The D/P ratios of the study group
did no differ significantly from the control group.
Conclusion: We conclude that the size selectivity of
the capillary permeability is not affected in the peritoneal membrane in
children with NS due to glomerulosclerosis and congenital nephrotic
syndrome. 相似文献
6.
Schmid KW Bankfalvi A Mucke S Ofner D Riehemann K Schroder S Stucker A Totsch M Dockhorn-Dworniczak B 《Endocrine pathology》1996,7(2):121-130
Routinely processed tissues from a series of benign and malignant thyroid lesions were immunohistochemically investigated
with antibodies against p53 and mdm-2. p53 was immunolocalized in <10% of nuclei in 2/80 nodular goiters, 2/60 follicular
adenomas, 26/68 follicular carcinomas, 7/40 papillary carcinomas, 3/10 “insular” carcinomas, and 10/31 anaplastic carcinomas.
More than 10% positively stained nuclei were found in 2 widely invasive follicular, 2 insular, and 15 anaplastic carcinomas.
All p53-positive cases showed a concomitant immunohistochemical mdm-2 expression; an immunohistochemical colocalization on
serial section was demonstrated in 12 anaplastic carcinomas. Screening by polymerase chain reaction single-strand conformation
polymorphism (PCR-SSCP) analysis of these 12 cases revealed no relevant mutations in the coding regions of exons 2–11 of the
p53 gene. Additionally, 1 follicular adenoma, 6 follicular carcinomas (4 minimally and 2 widely invasive), 1 papillary, and
2 poorly differentiated insular carcinomas were mdm-2 positive without immunohistochemically detectable p53 expression. These
results provide evidence that wild-type p53 expression in thyroid carcinomas may be associated with mdm-2 induced formation
of stable complexes. However, the role of p53 mutations and p53 protein inactivation owing to other factors (e.g., mdm-2)
in the progression of thyroid carcinomas is still poorly understood. 相似文献
7.
This study examined the effects of anonymity, gender, and erotophilia on the quality of self-reports of socially sensitive health-related behaviors. A sample of 155 male and 203 female undergraduate students was randomly assigned to an anonymous and a confidential (i.e., nonanonymous) assessment condition. Gender, erotophilia, self-reports (of substance use, sexual behaviors, illegal activity), and perceived item threat were assessed by questionnaire. Data quality was strongly affected by experimental condition and gender. Thus, terminations were more frequent in the confidential condition and among women. In the confidential condition, women were significantly more likely to prefer not to respond to sensitive items compared to men. Both female gender and confidential condition were associated with lower frequency reports of sensitive health behaviors, and greater perceived threat of the assessment questions. Self-reported engagement in sensitive behaviors was positively related to both perceived question threat and erotophilia. Path analyses suggest that question threat mediates the effects of anonymity manipulations and gender on data quality (item refusal, termination), and that erotophilia mediates the effects of gender on incidence and frequency self-reports. The results indicate that anonymous assessments as well as male gender are associated with better data quality. 相似文献
8.
乳腺管状小叶癌(Tubulolobular carcinoma,TLC)最初是被作为小叶癌的管状变型。作者总结了27例TLC的组织学、免疫表型和临床特征,并与纯小管癌和经典型小叶癌进行了比较。此组患者年龄43-79岁(中位年龄60岁)。1例双侧乳腺受累,5例病变为多灶性。肿瘤直径0.5-2.5cm,色灰褐,质硬。组织学观察:TLC的肿瘤细胞形成管状和条索状两种结构模式并相互混杂,且两者比例相当(统称为管状小叶模式)。 相似文献
9.
Germline mutations of the CDKN2 gene in UK melanoma families 总被引:4,自引:1,他引:4
Harland M; Meloni R; Gruis N; Pinney E; Brookes S; Spurr NK; Frischauf AM; Bataille V; Peters G; Cuzick J; Selby P; Bishop DT; Bishop JN 《Human molecular genetics》1997,6(12):2061-2067
Germline mutations in CDKN2 on chromosome 9p21, which codes for the cyclin
D kinase inhibitor p16, and more rarely, mutations in the gene coding for
CDK4, the protein to which p16 binds, underlie susceptibility in some
melanoma families. We have sequenced all exons of CDKN2 and analysed the
CDK4 gene for mutations in 27 UK families showing evidence of
predisposition to melanoma. Five different germline mutations in CDKN2 were
found in six families. Three of the mutations (Met53Ile, Arg24Pro and
23ins24) have been reported previously. We have identified two novel CDKN2
mutations (88delG and Ala118Thr) which are likely to be associated with the
development of melanoma, because of their co-segregation with the disease
and their likely functional effect on the CDKN2 protein. In binding assays
the protein expressed from the previously described mutation, Met53Ile, did
not bind to CDK4/CDK6, confirming its role as a causal mutation in the
development of melanoma. Ala118Thr appeared to be functional in this assay.
Arg24Pro appeared to bind to CDK6, but not to CDK4. No mutations were
detected in exon 2 of CDK4, suggesting that causal mutations in this gene
are uncommon. The penetrance of these mutant CDKN2 genes is not yet
established, nor is the risk of non-melanoma cancer to gene carriers.
相似文献
10.