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The Long-term Effect of Standardized Anal Dilatation for Chronic Anal Fissure on Anal Continence
Ilia Pinsk,David Czeiger,Daria Lichtman,Avraham Reshef 대한대장항문학회 2021 Annals of Coloproctolgy Vol.37 No.2
Purpose For the past several decades, internal anal sphincterotomy has generally been considered to be the standard operation for an anal fissure. However, wound complications inherent in this operation forced surgeons to look for an alternative form of treatment. The aim of our study was to evaluate the long-term outcome of anal dilatation for chronic anal fissure, especially possible negative impact on anal sphincter function. Methods The study was approved by the local Institutional Review Board and given a waiver of written consent. A phone call survey was undertaken among a group of consecutive patients who had an anal dilatation by standardized technique for chronic anal fissure for the period between 2000 and 2016. The survey included medical, obstetrical and surgical-related data, Wexner fecal incontinence score, recurrence of the anal fissure, and the need for additional medical intervention. Five hundred 48 patients were identified after limitations of age, concomitant pathology, and procedures that were applied to the hospital computerized database. Eighty-five patients (group A) agreed to participate in the survey and 463 patients did not. Results There were no differences between groups in demographic information and medical records data; therefore, group A may well represent a satisfactory sample of the whole group. The interval between the procedure and the survey was 6.8 ± 2.7 years. The Wexner incontinence score was 0 in 94% of patients. Conclusion Anal dilatation, performed in a systematic and standardized way, has a successful outcome with no complications and has no clear long-term negative impact on anal sphincter function.
MoS2 FULLERENE-LIKE NANOPARTICLES AND NANOTUBES USING GAS-PHASE REACTION WITH MoCl5
F. L. DEEPAK,MAYA BAR-SADAN,RESHEF TENNE,ALEXANDER MARGOLIN,INNA WIESEL,RONIT POPOVITZ-BIRO 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2006 NANO Vol.1 No.2
Inorganic fullerene-like (IF) nanoparticles of MoS2 were synthesized using gas-phase reaction starting from MoCl5 and H2S. The IF-MoS2 nanoparticles are spherical and in some cases faceted with diameters in general ranging between 20 and 80 nm. The IF-MoS2 nanoparticles have large hollow cores, filled in some cases with amorphous material. Various parameters have been investigated to understand the growth and formation of the IF-MoS2 nanoparticles. The parameters that have been studied include flow rates of the various carrier gases, temperature at which the reaction was carried out, time of the reaction and heating of the precursor material. The best set of conditions wherein maximum yields of the IF-MoS2 nanoparticles are obtained have been identified. Additionally, annealing the as-obtained samples or heating them in a mixture of H2 along with H2S improves the crystallinity and reduces the amorphous material filling in the core. Apart from the fullerene-like nanoparticles under certain experimental conditions nanotubes of MoS2 have also been obtained nonetheless in small yields.
Synthesis and Characterization of Pb@GaS Core–Shell Fullerene-Like Nanoparticles and Nanotubes
Olga Brontvein,Lothar Houben,RONIT POPOVITZ-BIRO,Moshe Levy,Daniel Feuermann,RESHEF TENNE,Jeffrey M. Gordon 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.3
New types of core–shell nanoparticles are reported: Pb@GaS fullerene-like and nanotubular structures, achieved via the continuously high reactor temperatures and ultra-hot stronggradient annealing environments created by highly concentrated sunlight. Structural and chemical characterizations suggest a formation mechanism where vaporized Pb condenses into nanoparticles that are stabilized as they become covered by molten GaS, the ensuing crystallization of which creates the outer layers. Hollow-core GaS fullerene-like nanoparticles and nanotubes were also observed among the products, demonstrating that a single solar procedure can generate a variety of core–shell and hollow nanostructures. The proposed formation mechanisms can account for their relative abundance and the characterization data.