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排序方式: 共有113条查询结果,搜索用时 15 毫秒
1.
Alena Jiroutova Rastislav Slavkovsky Martina Cermakova Lenka Majdiakova Irena Hanovcova Radka Bolehovska Milena Hajzlerova Hana Radilova Ema Ruszova Jiri Kanta 《Experimental and toxicologic pathology》2007,58(4):263-273
Hepatic stellate cells (HSC) and liver myofibroblasts (MFB) are two cell populations most likely responsible for the synthesis of most connective tissue components in fibrotic liver. They differ in their origin and location, and possibly in patterns of gene expression. Normal and carbon tetrachloride-cirrhotic livers from rats were used to isolate HSC. Liver was perfused with pronase and collagenase solutions, followed by centrifugation of the cell suspension on a density gradient. HSC were quiescent 2 days after plating on plastic but they became activated after another 5 days in culture. When the culture was passaged 5 times, its character changed profoundly as HSC were replaced by MFB. Microarray analysis was used to determine gene expression in quiescent HSC, activated HSC and MFB. The expression of 49 genes coding for connective tissue proteins, proteoglycans, metalloproteinases and their inhibitors, growth factors and cellular markers was determined. The pattern of gene expression changed during HSC activation and there were distinct differences between HSC and MFB. Little difference between normal cells and cells isolated from cirrhotic liver was found. 相似文献
2.
This paper addressed the issues of both direct and indirect synthesis of Ni aluminides by pack cementation (pure Ni and IN 718 superalloy). On the Al-Ni diffusion twosome under pressure, at temperatures below and above the Al melting temperature, the appearance and evolution of diffusion porosity because of the Kirkendall–Frenkel effect manifestation was highlighted. It has been confirmed that, as the temperature rises above the Al melting temperature, the porosity decreases. Nickel-based superalloys, and in particular IN 718, significantly increase their performance by increasing the aluminides proportion in the top diffusion coating. This is made possible by changing the value of the Al and Ni weight percentage ratio in this area (noted as Al/Ni). In the case of the diffusion twosome between IN 718 and pack aluminizing mixtures, having in their composition as active components Al powder, Ferroaluminum (FeAl40) or mixtures of Al and Fe powders, at processing temperatures above the Al melting temperature, by modifying the active component of the mixture, substantial changes in the Al/Ni values were observed, as well as in the maximum %Al in the diffusion coating and of its thickness. It was found that, when switching from Al to FeAl40 or powder mixture (Al + Fe), the Al/Ni value changes between 3.43 and 1.01, from initial subunit values. The experiments confirmed that the highest %Al in the top aluminized diffusion coating, for IN 718, was obtained if the powder mixture contained 66.34 wt.% Al. 相似文献
3.
Laura Kropp Anish Baswanth Chakka Svetlana Yatsenko Eleonora Di Gregorio Daniela Lacerenza Giovanna Vaula Flavia Talarico Paola Mandich Camilo Toro Eleonore Eymard Pierre Pierre Labauge Sabina Capellari Pietro Cortelli Filippo Pinto Vairo Diego Miguel Danielle Stubbolo Lourenco Charles Marques William Gahl Odile Boespflug‐Tanguy Atle Melberg Sharon Hassin‐Baer Oren S. Cohen Rastislav Pjontek Armin Grau Thomas Klopstock Brent Fogel Inge Meijer Guy Rouleau Jean‐Pierre L. Bouchard Madhavi Ganapathiraju Adeline Vanderver Niklas Dahl Grace Hobson Alfredo Brusco Quasar Saleem Padiath 《Human mutation》2013,34(8):1160-1171
Autosomal dominant leukodystrophy (ADLD) is an adult onset demyelinating disorder that is caused by duplications of the lamin B1 (LMNB1) gene. However, as only a few cases have been analyzed in detail, the mechanisms underlying LMNB1 duplications are unclear. We report the detailed molecular analysis of the largest collection of ADLD families studied, to date. We have identified the minimal duplicated region necessary for the disease, defined all the duplication junctions at the nucleotide level and identified the first inverted LMNB1 duplication. We have demonstrated that the duplications are not recurrent; patients with identical duplications share the same haplotype, likely inherited from a common founder and that the duplications originated from intrachromosomal events. The duplication junction sequences indicated that nonhomologous end joining or replication‐based mechanisms such fork stalling and template switching or microhomology‐mediated break induced repair are likely to be involved. LMNB1 expression was increased in patients’ fibroblasts both at mRNA and protein levels and the three LMNB1 alleles in ADLD patients show equal expression, suggesting that regulatory regions are maintained within the rearranged segment. These results have allowed us to elucidate duplication mechanisms and provide insights into allele‐specific LMNB1 expression levels. 相似文献
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Michal Demeter Martin Vorčák Rudolf Hyrdel Rastislav Kunda Peter Bánovčin 《Scandinavian journal of gastroenterology》2020,55(4):509-514
AbstractBackground: Standard treatment for esophageal epiphrenic diverticula associated with achalasia includes surgical diverticulectomy, myotomy and anterior fundoplication. However, several case reports published recently suggest that endoscopic approach using per oral endoscopic myotomy is a safe and effective alternative.Methods: This is a retrospective review of a single center case series of patients with achalasia and epiphrenic diverticula. During the treatment, the POEM guided on the opposite site of the diverticular neck without diverticulotomy was performed. Symptomatic outcome was evaluated 3 months after procedure and afterwards with the median follow-up time of 24 months. High resolution manometry was performed 3 months after the procedure.Results: Seven patients with esophageal epiphrenic diverticula were included. POEM was successfully performed in all patients, with no complications in the periprocedural period. We observed a significant reduction of Eckardt score and the relaxation pressure of the lower esophageal sphincter (31.8 vs. 8.8?mmHg, p < .0001).Conclusions: POEM is a promising approach in the management of achalasia and esophageal epiphrenic diverticula. We demonstrated its safety, efficiency and ability to provide symptom reduction and decrease of the LES relaxation pressure even without diverticulotomy. Multicentric studies on larger cohorts of patients and with longer follow-up time are required to confirm these results. 相似文献
7.
Rastislav Bernt Jozef
arnovský Ivan Kov
Rastislav Miku Jií Fries Radoslav Csintalan 《Materials》2022,15(1)
The present paper analyzes the damage of surfaces at spots of frictional contact, namely, the friction nodes on a camshaft and the connecting rod pins of a crankshaft. The resulting wear of the monitored friction nodes reduces the technical life of the machines, which can lead to the decommissioning of the machine. Wear was assessed by measuring roughness and microhardness and by observing the microstructures of the materials. The results of the experiments show that the rotating parts displayed visible wear on the cams, as well as on the connecting rod pins. The experiments revealed that wear was caused by the heating of the material to a high temperature during the operation of the machine and that there was a gradual cooling and tempering of the material, which led to a reduction in the microhardness of the monitored object. Lower microhardness values can be a cause of greater wear of the monitored objects. When comparing the microhardness of the used and the new camshaft, the hardened layer of the new camshaft from secondary production has a significantly smaller thickness compared to worn cams, which leads to the finding of a different material quality compared to the original parts from primary production. This fact indicates that the wear of a new camshaft as a spare part can contribute to the shortening of the technical life of friction nodes. 相似文献
8.
For studying if piperazine-ring plays a role in teratogenicity pairs of compounds of similar structure and action (perphenazine-chloropromazine, chlorcyclizine--thenalidine, haloanisone--haloperiodol) had been selected, where only one of them contained piperazine-ring. The applied single doses were 3.7 X 10(-4) M/kg. Experiments were carried out on Wistar/H-Riop pregnant rats; equimolar doses of three drug-pairs were given orally on the 13th, 14th, or 15th gestational days, respectively. Perphenazine and chlorcyclizine, as alkyl-piperazine derivatives induced cleft palate and micromelia, while chlorpromazine and thenalidine did not. After the methoxyphenyl-piperazine containing substance--haloanisone--micromelia was higher as compared to that containing no piperazine moiety (haloperidol). These results indicate that the piperazine-ring may play an important role in the teratogenicity of drugs in rats. 相似文献
9.
Human leukocyte and fibroblast interferon in a combination therapy of dendritic keratitis 总被引:2,自引:0,他引:2
Rainer Sundmacher Kari Cantell Rastislav Skoda Christoph Hallermann Dieter Neumann-Haefelin 《Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie》1978,208(4):229-233
Summary Thirty-eight patients with virologically proven dendritic keratitis were treated using either debridement plus human leukocyte interferon (HLI) or debridement plus human fibroblast interferon (HFI) in a randomized, doubleblind study. We administered one drop of HLI or HFI (1×106 reference units/ml) daily and found no significant difference in the action of either type of interferon.
With support from the Deutsche Forschungsgemeinschaft 相似文献
Zusammenfassung 38 Patienten mit virologisch verifizierter Keratitis dendritica wurden in einer randomisierten Doppelblindstudie entweder mit Abrasio plus Humanleukozyteninterferon (HLI) oder Abrasio plus Humanfibroblasteninterferon (HFI) behandelt. Nur ein Tropfen Interferon (1×106 Einheiten/ml) wurde täglich gegeben. Es fand sich kein signifikanter Unterschied zwischen der Wirkung beider Interferone.
With support from the Deutsche Forschungsgemeinschaft 相似文献
10.
Krsek P Mikulecká A Druga R Kubová H Hlinák Z Suchomelová L Mares P 《Epilepsy & behavior : E&B》2004,5(2):180-191
The aims of the present study were to ascertain whether nonconvulsive status epilepticus (NCSE) could give rise to long-term behavioral deficits and permanent brain damage. Two months after NCSE was elicited with pilocarpine (15 mg/kg i.p.) in LiCl-pretreated adult male rats, animals were assigned to either behavioral (spontaneous behavior, social interaction, elevated plus-maze, rotorod, and bar-holding tests) or EEG studies. Another group of animals was sacrificed and their brains were processed for Nissl and Timm staining as well as for parvalbumin and calbindin immunohistochemistry. Behavioral analysis revealed motor deficits (shorter latencies to fall from rotorod as well as from bar) and disturbances in the social behavior of experimental animals (decreased interest in juvenile conspecific). EEGs showed no apparent abnormalities. Quantification of immunohistochemically stained sections revealed decreased amounts of parvalbumin- and calbindin-immunoreactive neurons in the motor cortex and of parvalbumin-positive neurons in the dentate gyrus. Despite relatively inconspicuous manifestations, NCSE may represent a risk for long-term deficits. 相似文献