全文获取类型
收费全文 | 229篇 |
免费 | 24篇 |
国内免费 | 10篇 |
专业分类
儿科学 | 2篇 |
基础医学 | 35篇 |
临床医学 | 34篇 |
内科学 | 120篇 |
皮肤病学 | 4篇 |
神经病学 | 7篇 |
特种医学 | 29篇 |
外科学 | 12篇 |
综合类 | 3篇 |
预防医学 | 3篇 |
药学 | 5篇 |
中国医学 | 1篇 |
肿瘤学 | 8篇 |
出版年
2021年 | 5篇 |
2020年 | 2篇 |
2019年 | 4篇 |
2018年 | 4篇 |
2017年 | 1篇 |
2016年 | 2篇 |
2015年 | 2篇 |
2014年 | 6篇 |
2013年 | 12篇 |
2012年 | 5篇 |
2011年 | 7篇 |
2010年 | 7篇 |
2009年 | 4篇 |
2008年 | 5篇 |
2007年 | 5篇 |
2006年 | 11篇 |
2005年 | 3篇 |
2004年 | 7篇 |
2003年 | 13篇 |
2002年 | 8篇 |
2001年 | 10篇 |
2000年 | 16篇 |
1999年 | 8篇 |
1998年 | 4篇 |
1997年 | 6篇 |
1996年 | 5篇 |
1995年 | 1篇 |
1994年 | 6篇 |
1993年 | 5篇 |
1992年 | 6篇 |
1991年 | 6篇 |
1990年 | 6篇 |
1989年 | 8篇 |
1988年 | 10篇 |
1987年 | 11篇 |
1986年 | 7篇 |
1985年 | 8篇 |
1984年 | 2篇 |
1983年 | 3篇 |
1982年 | 3篇 |
1981年 | 3篇 |
1980年 | 1篇 |
1979年 | 2篇 |
1978年 | 4篇 |
1977年 | 3篇 |
1975年 | 5篇 |
1974年 | 1篇 |
排序方式: 共有263条查询结果,搜索用时 15 毫秒
1.
Prospective randomized comparison of mezlocillin therapy alone with combined ampicillin and gentamicin therapy for patients with cholangitis 总被引:3,自引:0,他引:3
W B Gerecht N K Henry W W Hoffman S M Muller N F LaRusso J E Rosenblatt W R Wilson 《Archives of internal medicine》1989,149(6):1279-1284
Forty-six patients with cholangitis were randomized to receive therapy with mezlocillin sodium (24 patients) or a combination of ampicillin sodium--gentamicin sulfate (22 patients). The biliary concentration of mezlocillin was 112 times higher than that of ampicillin and 778 times higher than that of gentamicin. The ratio of the concentration in serum or bile over the minimum inhibitory concentration against aerobic gram-negative bacilli (therapeutic index) was higher for mezlocillin than for either ampicillin or gentamicin. Twenty (83%) of 24 patients were cured following mezlocillin therapy compared with 9 (41%) of 22 patients after ampicillin-gentamicin therapy. The 3 patients with superinfection were in the ampicillin-gentamicin arm of the study. Fewer toxic or adverse effects occurred in association with mezlocillin treatment than with ampicillin-gentamicin treatment. Mezlocillin therapy was more effective, less toxic, and less expensive than treatment with ampicillin and gentamicin for patients with cholangitis. 相似文献
2.
Hepatic processing of transforming growth factor beta in the rat. Uptake, metabolism, and biliary excretion. 总被引:21,自引:7,他引:14
下载免费PDF全文
![点击此处可从《The Journal of clinical investigation》网站下载免费的PDF全文](/ch/ext_images/free.gif)
R J Coffey Jr L J Kost R M Lyons H L Moses N F LaRusso 《The Journal of clinical investigation》1987,80(3):750-757
Transforming growth factor beta (TGF beta), a recently discovered polypeptide, modulates growth of normal and neoplastic cells. Since little is known concerning in vivo disposition of TGF beta, we performed studies to examine the hepatic processing of biologically active 125I-TGF beta in the rat. After intravenous injection, 125I-TGF beta disappeared from the plasma with an initial t1/2 of 2.2 min; partial hepatectomy delayed the plasma disappearance of 125I-TGF beta by 80%. 60 min after intrafemoral injection, 63% of the recovered label was present in liver and/or bile; by 90 min, most of the label removed by the liver (83%) had been slowly excreted into bile. Nearly all the label in bile (96%) was soluble in trichloracetic acid and not immunoprecipitable by specific antiserum. Colchicine and vinblastine inhibited cumulative biliary excretion of label by 28 and 37%, respectively; chloroquine and leupeptin each increased the amount of label in bile that was precipitable by trichloracetic acid and that coeluted with authentic 125I-TGF beta on molecular sieve chromatography. There was efficient first-pass hepatic extraction of 125I-TGF beta (36%) in the isolated perfused rat liver, which was inhibited by unlabeled TGF beta (but not by epidermal growth factor, EGF) and by lectins in a dose-dependent manner; prolonged fasting also decreased clearance (26%). After fractionation of liver by differential or isopycnic centrifugation, radiolabel codistributed with marker enzymes for lysosomes. The results indicate rapid, extensive, inhibitable, and organ-selective extraction of TGF beta by the liver. After extraction, TGF beta undergoes efficient transhepatic transport, extensive intracellular metabolism, and slow but complete biliary excretion of its metabolites. Liver fractionation studies and pharmacologic manipulations suggest that these processes are associated with organelles that include microtubules and lysosomes. The data suggest that the liver is a major target tissue or site of metabolism for biologically active TGF beta. 相似文献
3.
Solitary bronchioloalveolar carcinoma: CT criteria 总被引:14,自引:0,他引:14
Kuhlman JE; Fishman EK; Kuhajda FP; Meziane MM; Khouri NF; Zerhouni EA; Siegelman SS 《Radiology》1988,167(2):379-382
The computed tomographic (CT) scans of 30 patients with solitary bronchioloalveolar carcinoma were reviewed. Common features at CT included the peripheral or subpleural location of a pulmonary mass (25 cases), pseudocavitation (18 cases), heterogeneous attenuation (17 cases), irregular margins forming a star pattern (22 cases), and pleural tags (21 cases). Using these CT criteria, four independent observers attempted to identify cases of bronchioloalveolar carcinoma from a larger sample of lung cancers and benign lesions by categorizing a series of test cases into four probability categories. Although the bronchioloalveolar carcinomas were correctly ranked in the two highest probability categories 75% of the time (in 45 of 60 cases), there was considerable overlap with other lung lesions, particularly with adenocarcinoma and large cell undifferentiated carcinoma. However, even though the typical features of bronchioloalveolar carcinoma are not invariable or highly specific, they are characteristic enough to suggest the diagnosis. 相似文献
4.
Patrick L Splinter Konstantinos N Lazaridis Paul A Dawson Nicholas F LaRusso 《World journal of gastroenterology : WJG》2006,12(42)
AIM:To determine if novel bile acid transporters may be expressed in human tissues.METHODS:SLC10A1 (NTCP) was used as a probe to search the NCBI database for homology to previously uncharacterized ESTs. The homology search identified an EST (termed SLC10A4) that shares sequence identity with SLC10A1 and SLC10A2 (ASBT). We performed Northern blot analysis and RT-PCR to determine the tissue distribution of SLC10A4. SLC10A4 was cloned in frame with an epitope tag and overexpressed in CHO cells to determine cellular localization and functional analysis of bile acid uptake.RESULTS:Northern analysis revealed that SLC 10A4 mRNA is ubiquitously expressed fn human tissues with the highest levels of mRNA expression in brain,placenta, and liver. In SLC10A4-transfected CHO cells,immunoblotting analysis and immunofluorescence staining demonstrated a 49-kDa protein that is expressed at the plasma membrane and intracellular compartments.Functional analysis of SLC10A4 showed no significant taurocholate uptake in the presence of sodium when compared to untransfected CHO cells.CONCLUSION:To date, we have shown that this protein has no capacity to transport taurocholate relative to SLC1041; however, given its ubiquitous tissue distribution, it may play a more active role in transporting other endogenous organic anions. 相似文献
5.
In vivo administration of chloroquine to rats caused an increase in the pH of hepatocyte lysosomes within 1 hr after administration with a return to baseline pH values by 3 hr; continued administration of chloroquine for up to 12 days was unaccompanied by any further changes in hepatocyte lysosomal pH. We interpret these data as evidence against a major role for an increase in the pH of hepatocyte lysosomes in CAC-induced phospholipidosis. 相似文献
6.
Complications and risk factors after ileal pouch-anal anastomosis for ulcerative colitis associated with primary sclerosing cholangitis. 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)
A H Kartheuser R R Dozois R H Wiesner N F LaRusso D M Ilstrup C D Schleck 《Annals of surgery》1993,217(4):314-320
OBJECTIVE: This study determined predictive factors for postoperative complications and outcome after ileal pouch-anal anastomosis in patients with ulcerative colitis and primary sclerosing cholangitis. SUMMARY BACKGROUND DATA: Patients with ulcerative colitis and primary sclerosing cholangitis treated by colectomy and ileostomy are at high risk of troublesome bleeding from peristomal varices. METHODS: Postoperative complications and outcome were assessed in 40 patients with ulcerative colitis and sclerosing cholangitis who received an ileal pouch-anal anastomosis between January 1981 and February 1990. RESULTS: Immediate postoperative and remote ileoanal anastomosis-related complications were high but related directly to the severity of liver disease. No patient had perianastomotic anal bleeding. CONCLUSIONS: In patients with both ulcerative colitis and primary sclerosing cholangitis, ileal pouch-anal anastomosis is safe and is not associated with perianastomotic bleeding. 相似文献
7.
Hepatic artery and portal vein remodeling in rat liver: vascular response to selective cholangiocyte proliferation
下载免费PDF全文
![点击此处可从《The American journal of pathology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Three-dimensional reconstruction of the biliary tree, hepatic artery, and portal vein in normal rats and rats fed alpha-naphthylisothiocyanate (ANIT), a compound that causes selective proliferation of epithelial cells (ie, cholangiocytes) that line the bile ducts, was performed. All hepatic structures in ANIT-fed rats branched 1.5 times more often than in normal rats, reflecting an increased number of segments, whereas the length of the biliary tree, hepatic artery, and portal vein remain unchanged. The length of the proximal vessel segments was uniform in both groups of rats whereas the length of distal segments decreased twofold in ANIT-fed rats, suggesting that small vessels preferentially undergo proliferation. In contrast, the length of all bile duct segments decreased twofold, suggesting that ANIT induced proliferation of all compartments of the biliary tree. The total volume of the biliary tree, hepatic artery, and portal vein was increased 18, 4, and 3 times, respectively, after ANIT feeding. The diameters of the bile ducts (range, 20 to 259 microm) and arterial (range, 21 to 276 microm) segments in ANIT-fed rats did not differ from normal rats (range, 21 to 245 microm and 20 to 265 microm, respectively). In contrast, the diameters of proximal venous segments in ANIT-fed rats were significantly less (316 +/- 68 micro m versus 488 +/- 89 micro m, P < 0.001). The data suggest that after experimentally induced cholangiocyte proliferation, the hepatic artery and portal vein also undergo marked proliferation, presumably to support the increased nutritional and functional demands of the proliferated bile ducts. The molecular mechanisms of these vascular changes remain to be determined. 相似文献
8.
9.
Characterization of melanocyte stimulating hormone receptor variant alleles in twins with red hair 总被引:7,自引:3,他引:7
The association between MSHR coding region variation and hair colour in
humans has been examined by genotyping 25 red haired and 62 non-red
Caucasians, all of whom were 12 years of age and members of a twin pair
study. Twelve amino acid substitutions were seen at 11 different sites,
nine of these being newly described MSHR variants. The previously reported
Val92Met allele shows no association with hair colour, but the three
alleles Arg151Cys, Arg160Trp and Asp294His were associated with red hair
and one Val60Leu variant was most frequent in fair/blonde and light brown
hair colours. Variant MSHR genotypes are associated with lighter skin types
and red hair (P < 0.001). However, comparison of the MSHR genotypes in
dizygotic twin pairs discordant for red hair colour indicates that the MSHR
gene cannot be solely responsible for the red hair phenotype, since five of
13 pairs tested had both haplotypes identical by state (with three of the
five having both identical by descent). Rather, it is likely that
additional modifier genes exist, making variance in the MSHR gene necessary
but not always sufficient, for red hair production.
相似文献
10.