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Yildiz, Alp,Leventoglu, Sezai,Yildiz, Aybala,Inan, Arda,Mentes, Bedrettin Bulent 대한대장항문학회 2023 Annals of Coloproctolgy Vol.39 No.3
Purpose: Perianal Buschke-Löwenstein tumor (BLT) is characterized by an exophytic cauliflower-like mass surrounding the perianal region. Its tendency to infiltrate the adjacent tissues, its massiveness, and its high recurrence rate cause difficulties in treatment. The aim of this study is to report our strategy with wide local excision and flap reconstruction for BLT.Methods: From November 2002 to June 2019, 11 patients (9 men) with a mean age of 33.45 years (range, 19–54 years) were operated on for BLT. All patients underwent wide local excision and V-Y flap reconstruction, supplemented with other flaps whenever needed. No additional modalities were used.Results: Two patients had a history of anal intercourse while all patients were human immunodeficiency virus-negative. The mean tumor length was 15.54 ± 1.34 cm (range, 10–26 cm). Human papillomavirus 6 was the most common type identified. Partial wound dehiscence developed in 3 patients, while anal stenosis, mucosal ectropion, or local recurrence was not observed during the mean follow-up period of 50.45 ± 1.75 months (range, 10–196 months).Conclusion: In patients with perianal BLT, wide local excision and flap reconstruction result in a high healing rate without significant complications.
Murat Kaya,Yavuz Selim Cakmak,Talat Baran,Meltem Asan-Ozusaglam,Ayfer Mentes,Kabil Ozcan Tozak 한국생물공학회 2014 Biotechnology and Bioprocess Engineering Vol.19 No.1
The paper describes the isolation and characterizationof chitin and chitosan from Daphnia longispinaresting eggs harvested from a reservoir. Resting eggs arefertilized eggs that are encased in chitinous shells called‘ephippia’ and which ensure the survival of the Daphniapopulation in adverse conditions. The chitin-content ofD. longispina resting eggs was found to be 23 ~ 25% andthe chitosan (having a 70 ~ 75% deacetylation degree)yield of the chitin was 76 ~ 77%. This high chitin-contentindicates that D. longispina resting eggs can be exploitedas a chitin source. The structure and thermal properties ofchitin, extracted from D. longispina resting eggs, werecharacterized by employing Fourier transform infraredspectroscopy, thermogravimetric analysis, X-ray diffractionand scanning electron microscopy. The crystallinity of thechitin was found to be very low (48%). Physicochemicallycharacterizedchitosan and the produced O-carboxymethylchitosan were tested for their antimicrobial and antioxidantactivity. It has been observed that chitosan displaysantimicrobial activity against all pathogenic bacteria, whereasO-carboxymethyl chitosan only exhibits inhibition activityagainst L. garvieae, L. Monocytogenes ATCC 7644, Y. enterocolitica NCTC 11175 and S. aureus ATCC 25923. Ina free radical scavenging activity assay, the IC50 values ofchitosan, O-carboxymethyl chitosan and butylated hydroxytoluenewere found to be 23.01, 56.43 and 0.05, respectively. The ferric-reducing power of O-carboxymethyl chitosan(EC50 = 8.30) indicated higher activity than chitosan (EC50= 10.12).
Murat Kaya,Talat Baran,Meltem Asan-Ozusaglam,Yavuz Selim Cakmak,Kabil Ozcan Tozak,Abbas Mol,Ayfer Mentes,Goksal Sezen 한국생물공학회 2015 Biotechnology and Bioprocess Engineering Vol.20 No.1
This study examined two gregarious Orthopteraspecies (Calliptamus barbarus and Oedaleus decorus) aspotential sources of chitin. The chitin content of the dryweight of C. barbarus was 20.5 ± 0.7%, and it was 16.5 ±0.7% for O. decorus. Furthermore, the yield of chitosan (70~ 75% deacetylation degree) from the grasshopper specieswas found to be 74 ~ 76%, which is close to the yield ofcommercial preparations obtained from the unused parts ofcrabs and shrimp. The chitin and chitosan obtained in thisway were analyzed using FTIR, TGA, XRD and SEMtechniques, and the antimicrobial properties of chitosansobtained from C. barbarus and O. decorus against pathogenicmicroorganisms of humans and fish were investigatedusing the disc diffusion and microdilution broth methods. The antimicrobial screening procedures indicated that thechitosan showed significant antimicrobial activity againstall of the tested pathogenic microorganisms. The MBC orMFC values were determined to be 0.16 ~ 2.50 mg/mL. The IC50 values for the chitins obtained from C. barbarusand O. decorus were 10.68 ± 0.27 and 10.91 ± 0.96 mg/mL,respectively, which were greater than the value forbutylated hydroxytoluene (BHT): 0.04 ± 0.01 mg/mL. These results suggest that these two species, which arecurrently considered to be pests because of over-breeding,are potentially alternative sources of chitin and chitosan,which are used in the food/feed industry for theirantimicrobial and antioxidant properties.
Mathias Klaui,Dennis Ilgaz,Lutz Heyne,June-Seo Kim,Olivier Boulle,Christine Schieback,Fabian Zinser,Stephen Krzyk,Mikhail Fonin,Ulrich Rudiger,Dirk Backes,Laura J. Heyderman,T. O. Mentes,A. Locatelli 한국자기학회 2009 Journal of Magnetics Vol.14 No.2
Herein, different concepts for domain wall propagation based on currents and fields that could potentially be used in magnetic data storage devices based on domains and domain walls are reviewed. By direct imaging, we show that vortex and transverse walls can be displaced using currents due to the spin transfer torque effect. For the case of field-induced wall motion, particular attention is paid to the influence of localized fields and local heating on the depinning and propagation of domain walls. Using an Au nanowire adjacent to a permalloy structure with a domain wall, the depinning field of the wall, when current pulses are injected into the Au nanowire, was studied. The current pulse drastically modified the depinning field, which depended on the interplay between the externally applied field direction and polarity of the current, leading subsequently to an Oersted field and heating of the permalloy at the interface with the Au wire. Placing the domain wall at various distances from the Au wire and studying different wall propagation directions, the range of Joule heating and Oersted field was determined; both effects could be separated. Approaches beyond conventional field- and current-induced wall displacement are briefly discussed.
Menelisi C. Dlamini,Mbongiseni L. Dlamini,Pumza Mente,Boitumelo Tlhaole,Rudolph Erasmus,Manoko S. Maubane-Nkadimeng,John A. Moma 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.111 No.-
A simplistic solvothermal process to fabricate novel amorphous TiO2-BiOBr-Bentonite (A-TiO2-BiOBr-Bt)multidimensional photocatalysts in this work is a practical and economically feasible technique for thefabrication of the reported photocatalysts as it is a one-pot process. The stickiness of the A-TiO2-BiOBr-Bt wet cake and the low drying temperature make A-TiO2-BiOBr-Bt a feasible platform compositefor the fabrication of the photoreactive inner coating of water treatment containers for photocatalytictreatment of drinking water. The A-TiO2-BiOBr-Bt photocatalyst with an A-TiO2:BiOBr:Bt mass ratio of1:1:2 (Ti1Bi1Bt2) displayed the highest BET surface area of 124.8 m2/g, a low bandgap of 2.86 eV, and sufficientlylow electron-hole recombination rate. The high number of A-TiO2-BiOBr p-n heterojunctions,and the Ti-O-Si and Bi-O-Si bonds between A-TiO2-BiOBr and Bt in Ti1Bi1Bt2 lowered its electron-holerecombination rate with enhanced visible light-harvesting ability. Within 70 min of visible light irradiation,150 mg of Ti1Bi1Bt2 gave 100% conversion of 100 mL of 20 ppm phenol with a pseudo-first-order rateconstant of 0.0322 min1 at pH 4.0. Scavenging experiments showed superoxide radicals (O2) and electrons(e) being the most dominant reactive oxidation species (ROS) responsible for the phenol photodegradationprocess while holes (h+) and hydroxyl radicals (OH) also exerted appreciableparticipation.
Ischemia-Modifi ed Albumin Levels in Children with Chronic Liver Disease
( Murat Cakir ),( Suleyman Caner Karahan ),( Ahmet Mentese ),( Elif Sag ),( Umit Cobanoglu ),( Tugcin Bora Polat ),( Erol Erduran ) 대한소화기기능성질환·운동학회 2012 Gut and Liver Vol.6 No.1
Background/Aims: Ischemia-modifi ed albumin (IMA) levels have been shown to correlate with the severity of liver failure in adults. However, the role of IMA levels has not been evaluated in children with chronic liver disease (CLD). We analyzed the clinical significance of IMA levels in children with CLD. Methods: Thirty-three children with CLD and 33 healthy children were included in the study. Blood was collected to analyze biochemical parameters, oxidant status, and IMA. Liver biopsies were re-evaluated for liver fibrosis; severe fibrosis (SF) was defi ned as fi brosis stage ≥4. Results: The IMA and and IMA to albumin ratios (IMARs) were signifi cantly higher in children with CLD than in those without (IMA: 0.545±0.095 vs 0.481±0.062, p=0.003; IMAR: 0.152±0.046 vs 0.126±0.018, p=0.04). The IMAR was positively correlated with the pediatric end-stage liver disease score (p=0.03, r=0.503) and fibrosis score (p=0.021, r=0.400). Patients with SF had higher IMARs compared to patients with mild fi brosis (0.181±0.056 vs 0.134±0.025, p=0.003). The area under the receiver operation curve (AUROC) for predicting SF was 0.78 (p=0.006). Using a cutoff ratio value of 0.140, the sensitivity and specificity were 84% and 70%, respectively. The AUROC for predicting the need for liver transplantation and/or death was 0.82 (p=0.013). With a cutoff value of 0.156, the sensitivity and specifi city was 83% and 82%, respectively. Kaplan-Meier analysis revealed increased morbidity and/or mortality in the group with an IMAR>0.156 (50% vs 4.3%, p=0.005). Conclusions: IMARs have been shown to provide important clues in predicting the fi brosis stage of the disease and determining the outcome in children with CLD. (Gut Liver 2012;6:92-97)
A New Strategy for High-Voltage Cathodes for K-Ion Batteries: Stoichiometric KVPO<sub>4</sub> F
Kim, Haegyeom,Seo, Dong-Hwa,Bianchini, Matteo,Clé,ment, Raphaë,le J.,Kim, Hyunchul,Kim, Jae Chul,Tian, Yaosen,Shi, Tan,Yoon, Won-Sub,Ceder, Gerbrand Wiley (John WileySons) 2018 Advanced energy materials Vol.8 No.26
집단미술치료가 경도 지적장애 학생의 자기표현에 미치는 효과
The Effects of a Group Art Therapy about Mild Mentally Retarded student Self Expression 조선대학교 조형미술연구소 2009 조형미술논문집 Vol.9 No.2
This study purpose to check the effects, if any, a group art therapy on self-expression of mentally retarded student. Study subjects are 2 male students and 1 female student, who were receiving integrated education in K elementary school in G city, and who marked IQ58~69, SA7.42~9.50 and SQ82~98 in KEDI-WISC. They were offered with total 28 sessions of art therapy, two times a week during the period of April through July, 2006. Research instruments are measurements of self-expression. For data analysis, change in acquired points is recorded through the sessions as self-expression and behavior observation measurements. To check if the data collected have any significance, individual points are compared. The study results are as follows. A group art therapy shows positive effects to help mentally retarded adolescents improve self-expression. Before the therapy, they used only a few words doing basic communication such as 'greetings' and 'answering'. As the session go by , however, they express more autonomous communication, such as 'explaining', 'telling opinions about things and behaviors', and draw some discussions such as 'waiting for turns to talk'. These result show that a group art therapy proves to be effective in enhancing self-expression and peer relations of mentally retarded student, by providing them with various art media and chance to work with others in which they can make their desires satisfied, self expression improved, and try to understand and accept feelings of other group members while interacting with them. Keywords 집단미술치료, 경도 지적장애아, 자기표현
Effect of a magnetic field on Schwinger mechanism in de Sitter spacetime
Bavarsad, Ehsan,Kim, Sang Pyo,Stahl, Clé,ment,Xue, She-Sheng American Physical Society 2018 Physical review. D Vol.97 No.2
<P>We investigate the effect of a uniform magnetic field background on scalar QED pair production in a four-dimensional de Sitter spacetime (dS(4)). We obtain a pair production rate which agrees with the known Schwinger result in the limit of Minkowski spacetime and with Hawking radiation in dS spacetime in the zero electric field limit. Our results describe how the cosmic magnetic field affects the pair production rate in cosmological setups. In addition, using the zeta function regularization scheme we calculate the induced current and examine the effect of a magnetic field on the vacuum expectation value of the current operator. We find that, in the case of a strong electromagnetic background the current responds as E . B, while in the infrared regime, it responds as B/E, which leads to a phenomenon of infrared hyperconductivity. These results for the induced current have important applications for the cosmic magnetic field evolution.</P>