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排序方式: 共有56条查询结果,搜索用时 15 毫秒
1.
Maria P Villela Vanessa L Andrade Bryelle Eccard Alceu A Jordão Jonas T Sertório Jose E Tanus‐Santos Ieda FO Silva Josianne N Silveira Valéria C Sandrim 《Clinical and experimental pharmacology & physiology》2014,41(10):744-747
Higher homocysteine (Hcy) levels are associated with cardiovascular risk. The aim of the present study was to evaluate the effect of simvastatin treatment on circulating Hcy levels in obese women without hypertension, diabetes or dyslipidaemia; and to determine whether the 677C>T polymorphism located in methylenetetrahydrofolate reductase (NAD(P)H) (MTHFR) gene modulates the effects of this treatment on Hcy and nitrite (as a biomarker of nitric oxide (NO) bioavailability). Twenty‐five obese women (body mass index ≥ 30 kg/m2) who had received 20 mg/day simvastatin for 6 weeks were enrolled in the study. Venous blood samples were collected to measure plasma biomarkers and gene polymorphisms. Simvastatin treatment significantly reduced total cholesterol, low‐density lipoprotein–cholesterol, thiobarbituric acid‐reactive substances, high‐sensitivity C‐reactive protein and Hcy, whereas nitrite levels were increased. The reduction in Hcy levels in carriers of the T allele was ?20.3% compared with –9.4% in patients with the CC genotype. Importantly, before treatment, nitrite levels were significantly higher in patients with the CC genotype compared with T allele carriers, whereas after treatment these levels were similar between groups. Our findings demonstrate that obese women without comorbidities and carrying the T variant of the 677C>T polymorphism of MTHFR exhibit benefits with simvastatin treatment, mainly in terms of increased NO levels. 相似文献
2.
3.
Canthaxanthin induces apoptosis in human cancer cell lines 总被引:3,自引:1,他引:2
Palozza P; Maggiano N; Calviello G; Lanza P; Piccioni E; Ranelletti FO; Bartoli GM 《Carcinogenesis》1998,19(2):373-376
To investigate the possibility that canthaxanthin inhibits cancer cell
growth by inducing apoptosis, human WiDr colon adenocarcinoma and SK- MEL-2
melanoma cells were treated with two different doses of the carotenoid for
48 h. Canthaxanthin was incorporated and/or associated to cells. The
treatment with the carotenoid caused growth inhibition in both cell types.
Concomitantly, apoptosis was induced. Increasing time of exposure and
carotenoid concentration, this effect was more pronounced. At 48 h, the
percentages of apoptotic cells were 13 and 15, using 1 microM
canthaxanthin, and 18 and 20, using 10 microM canthaxanthin in WiDr and
SK-MEL-2 cells, respectively. This study represents the first demonstration
that canthaxanthin is able to induce apoptosis in tumour cells.
相似文献
4.
5.
Sarvan Irmela Bürgelt Michaela Lindtner Oliver Greiner Matthias 《Bundesgesundheitsblatt, Gesundheitsforschung, Gesundheitsschutz》2017,60(7):689-696
Bundesgesundheitsblatt - Gesundheitsforschung - Gesundheitsschutz - Die Exposition der Bevölkerung gegenüber chemischen Stoffen in Lebensmitteln wird anhand von repräsentativen... 相似文献
6.
Normal and stenotic renal arteries: experimental balloon-expandable intraluminal stenting 总被引:2,自引:0,他引:2
Palmaz JC; Kopp DT; Hayashi H; Schatz RA; Hunter G; Tio FO; Garcia O; Alvarado R; Rees C; Thomas SC 《Radiology》1987,164(3):705-708
Elastic recoil of the vessel wall is a common cause of failure of percutaneous transluminal angioplasty in renal arteries. To oppose such recoil, balloon-expandable metal stents were implanted in artificially stenotic renal arteries in pigs and normal renal arteries in dogs and pigs. The stents were then examined angiographically and histologically at regular intervals. All stents were completely covered with endothelialized neointima in 3 weeks. There was no difference in intimal thickness between the stenotic and nonstenotic renal arteries. A large stent diameter and a large open or nonmetal surface may cause less intimal hyperplasia, but nonturbulent, fast arterial flow is probably the most important factor in ensuring long-term patency of the vessel. 相似文献
7.
FO Alaneme EN Maduagwu 《Malawi medical journal : the journal of Medical Association of Malawi》2004,16(1):6-8
Albino Wistar rats (Rattus norvegius) fed semi-purified diets containing 3.5%, 8%, 27%, and 64% casein, respectively, as the protein source, were poisoned with an intraperitoneal dose of 20mg N-nitrosodimethylamine (NDMA)/kg, following cannulation of the bile duct, in vitro, under urethane anaesthesia. Bile exudates was collected at designated time intervals and analysed for unchanged NDMA using thin layer chromatography and gas liquid chromatography methods. Rats on 64% high protein diet (HPD) were the highest excretors of NDMA, followed by rats on the 3.5% kwashiorkorigenic diet (KWD), 8% low protein diet (LPD) and 27% normal protein diet (NDP) as the least excretors, in that order. The corresponding values for culmulative excretions of NDMA were 4.38%, 2.74%, 2.96% and 4.11%, and for elimination rate contents they were 54.05Kh−1, 23.01Kh−1, 23.76Kh−1 and 48.88Kh−1, while the respective elimination half-life values were 0.013h, 0.031h, 0.029h and 0.014h. The toxicological and pharmacological implication of the pharmacokinetic findings are discussed. 相似文献
8.
Smith FO; Rauch C; Williams DE; March CJ; Arthur D; Hilden J; Lampkin BC; Buckley JD; Buckley CV; Woods WG; Dinndorf PA; Sorensen P; Kersey J; Hammond D; Bernstein ID 《Blood》1996,87(3):1123-1133
In our efforts to produce monoclonal antibodies that recognize cell- surface antigens expressed by hematopoietic precursor and stromal cells, we generated a monoclonal antibody, 7.1, which recognizes a 220- to 240-kD cell-surface protein whose N-terminal amino acid sequence is identical to the rat NG2 chondroitin sulfate proteoglycan molecule. This chondroitin sulfate proteoglycan, previously reported to be expressed by human melanoma cells, was not found to be expressed by normal hematopoietic cells, nor was it expressed on the cell surface of cell lines of hematopoietic origin including cell lines with 11q23 abnormalities. It was found on the cell surface of acute myeloid leukemia (AML) blasts and cell lines derived from nonhematopoietic tissues. Samples of leukemic marrow from 166 children with AML enrolled on Childrens Cancer Group protocol 213 were evaluated for cell-surface expression of this proteoglycan molecule. In 18 of 166 (11%) patient samples, greater than 25% of leukemic blasts expressed the NG2 molecule. These 18 patients had a poorer outcome with respect to survival (P = .002) and event-free survival (P = .035) with an actuarial survival at 4 years of 16.7%. Blast cell expression of the NG2 molecule was strongly associated with French-American-British M5 morphology (P < .0001) and abnormalities in chromosome band 11q23, site of the MLL gene. These results show that the NG2 molecule is expressed by malignant hematopoietic cells that have abnormalities in chromosome band 11q23, suggesting that antibody 7.1 may be useful in the rapid identification of this group of poor-prognosis patients. 相似文献
9.
Milani Junior R; Jorge MT; de Campos FP; Martins FP; Bousso A; Cardoso JL; Ribeiro LA; Fan HW; Franca FO; Sano-Martins IS; Cardoso D; Ide Fernandez C; Fernandes JC; Aldred VL; Sandoval MP; Puorto G; Theakston RD; Warrell DA 《QJM : monthly journal of the Association of Physicians》1997,90(5):323-334
The jararacucu, one of the most dreaded snakes of Brazil, southern Bolivia,
Paraguay and northeastern Argentina, is a heavily-built pit viper which may
grow to a length of 2.2 m. Up to 1000 mg (dry weight) of highly-lethal
venom may be milked from its venom glands on a single occasion. It has
accounted for 0.8% to 10% of series of snake bites in Sao Paulo State,
Brazil. We examined 29 cases of proven jararacucu bites recruited over a
20-year period in two Sao Paulo hospitals. Severe signs of local and
systemic envenoming, (local necrosis, shock, spontaneous systemic bleeding,
renal failure) were seen only in patients bitten by snakes longer than 50
cm; bites by shorter specimens were more likely to cause incoagulable
blood. Fourteen patients developed coagulopathy, six local necrosis
(requiring amputation in one) and five local abscesses. Two became shocked
and four developed renal failure. Three patients, aged 3, 11 and 65 years,
died 18.75, 27.75 and 83 h after being bitten, with respiratory and
circulatory failure despite large doses of specific antivenom and
intensive-care- unit management. In two patients, autopsies revealed acute
renal tubular necrosis, cerebral oedema, haemorrhagic rhabdomyolysis at the
site of the bite and disseminated intravascular coagulation. In one
survivor with chronic renal failure, renal biopsy showed bilateral cortical
necrosis; the patient remains dependent on haemodialysis. Effects of
polyspecific Bothrops antivenom were not impressive, and it has been
suggested that anti-Bothrops and anti-Crotalus antivenoms should be given
in combination.
相似文献
10.
Quercetin inhibits the growth of leukemic progenitors and induces the expression of transforming growth factor-beta 1 in these cells 总被引:1,自引:1,他引:1
Larocca LM; Teofili L; Sica S; Piantelli M; Maggiano N; Leone G; Ranelletti FO 《Blood》1995,85(12):3654-3661
We previously showed that quercetin (3,3',4',5,7 pentahydroxyflavone) inhibits in a dose-dependent manner the growth of acute leukemias and is able to enhance the antiproliferative activity of cytosine arabinoside. We show here that quercetin inhibits the clonogenic activity of 20 of 22 acute leukemias (AL; 4 M1-AML, 3 M2-AML, 2 M3-AML, 3 M4-AML, 3 M5-AML, and 7 ALL). In the present report, we show that the induction of transforming growth factor-beta 1 (TGF-beta 1) in leukemic blasts is one of the growth-inhibitory mechanisms of quercetin in these cells. This observation was supported by the following data. (1) Quercetin-sensitive leukemic blasts, when treated with quercetin, secrete large amounts of TGF-beta 1 in the medium and show positivity for TGF-beta 1-immunoreactive material in the cytoplasm. (2) At a concentration of 8 mumol/L, antisense TGF-beta 1 oligonucleotides prevent the growth-inhibitory action of quercetin. (3) Anti-TGF-beta 1 neutralizing monoclonal antibodies can prevent almost completely the growth-inhibitory activity of quercetin. The analysis of quercetin- resistant cases confirmed as well the central role of TGF-beta 1 in the growth-inhibitory activity of quercetin. In conclusion, quercetin can act as a cytostatic agent for leukemic cells by modulating the production of TGF-beta 1. 相似文献