Research trends and top cited articles on the frozen elephant trunk procedure

ABSTRACT Background: Bibliometric studies can direct academics. There have been many specialties and subspecialties where bibliometric analyses have been published, but our literature search yielded no bibliometric analysis of the frozen elephant trunk (FET) procedure. The primary objective of this study was to identify the most frequently referenced papers on FET procedure research and investigate the research trends. Methods: A dataset of all scientific journals published in the English language was created using the Web of Science (WOS) database. This search was then cross-referenced with a comparable search phrase query of the Scopus Library database in order to locate any publications that could have been overlooked during the first search. Citation counts were used to rank the articles. Also knowledge maps were created using VOSviewer software, and articles and reviews pertaining to the FET procedure in CVDs were taken from the WOS Core Collection. Results: A total of 484 documents on Scopus and 494 documents on WOSpertaining to the FET procedure were included in this study. The leading countries that published most of the research were Germany, Japan, and Italy in both databases. The largest subset of the FET procedure articles was published since 2012. The most cited authors were Karck, Shrestha, and Uchida. The mean Hirsch index of the articles was 40 and 10.47 per article. Conclusion:This study offers information on the traits and standards of the FET procedure literature that has received the most citations, as well as a ranking of the most important sources for this procedure. This work provides as a guide to what constitutes a citeable FET procedure publication by offering the most important references and mostly publishing journals

Violent games and agression: Moderator role of parentel guidance

With the spread of digital technology, the effects of video games which have violent content on children's behaviors have been the subject of curiosity. The literature indicates different findings. Some researchers suggest that violent games lead children to aggression while others indicate that playing violent games do not directly cause violence (see, Calvert et. al., 2015; Ferguson, 2015; Lin, 2013; Prescott, Sargent, & Hull, 2017). They demonstrate that there are mediator or moderator variables such as children's cognitive assessment powers, social attitudes towards violence, means of transport for violence and punishment after violence to indicate this relationship even social learning was effective in this context. The current study examines that mediator role of identification with game characters in the violent game (M) in the model and moderator role of parental guidance (W) on all paths between X, M, and dependent variable (Y), aggressive behavior (see, Hayes' Process Model 59, 2018). Our sample was 9 -17 aged 140 children. We directly asked children about their duration of violent game playing. We used the Identification with the Player Character Scale (Hefner, Klimmt, & Vorderer, 2007) to measure character identification. Participants answer the Social Support Questionnaire for Children (Gordon-Hollingsworth et. al., 2015) for the perceived parental support. The Aggression Scale (Orpinas & Frankowski, 2001 ) is used to measure our dependent variable which is children's aggressive behavior. Sample size analysis shows that it should be at least 138 participants total. According to the expected results, we think that the duration of violent video games play and identification with the game characters in them will predict children's aggressive behavior; however, we expect that the effect of the identification on aggressive behavior will decrease when perceived parental guidance increases. The results showed that when duration of violent game playing rises, identification with game character increases. On the contrary of our hypotheses, neither duration of violent game playing, nor identification with game character predict aggressive behavior. Effect of the constant on both identification with game character and aggressive behavior is significant. Therefore, future studies should leave classical violent game and aggressive behavior association and focus new predictors

Microwave Pretreatment for the Improvement of Physicochemical Properties of Carob Flour and Rice Starch-Based Electrospun Nanofilms

The aim of this study was to determine the effects of microwave pretreatment on physicochemical characteristics of carob flour and rice starch-based nanofibers produced by electrospinning. The effects of microwave heating on production of nanofibers by electrospinning have not been studied before. Another aim of the study was to fabricate and characterize nanofibers by using different carob flour concentrations (3%, 5% w/v) and rice starch (0.5% w/v). Films were characterized by scanning electron microscopy, water vapor permeability, X-ray diffraction, mechanical test, differential scanning calorimeter, and Fourier transform infrared spectrophotometer. Homogenous and bead-free fibers were obtained when microwave heating was used. Nanofibers originated from microwave-heated solution presented better characteristics in terms of water vapor permeability and mechanical properties as compared with conventionally heated ones. Microwave-heated solution had higher viscosity and available amino group amount as compared with conventionally heated solution. This study showed that microwave heating can be considered as a promising pretreatment method for electrospinning rather than conventional heating to be used in food packaging area

New oscillation criteria for third-order differential equations with bounded and unbounded neutral coefficients

This paper examines the oscillatory behavior of solutions to a class of thirdorder differential equations with bounded and unbounded neutral coefficients. Sufficient conditions for all solutions to be oscillatory are given. Some examples are considered to illustrate the main results and suggestions for future research are also included

Dielectric and Thermal Properties of Rice Cake Formulations Containing Different Gums Types

In this study, dielectric properties of rice cake formulations containing different gum types (xanthan, guar, locust bean, HPMC, and kappa-carrageenan) were determined at temperatures between 25 and 90 degrees C at 2450 MHz. Moreover, thermal properties of these formulations were determined by using differential scanning calorimeter (DSC). Dielectric properties of cake batters were found to be dependent on cake formulation. Xanthan and guar gum containing cake batters had the highest dielectric constant and loss factor values at 25 degrees C. Temperature dependence of dielectric properties was not significant until temperature of 85 degrees C. Gelatinization enthalpy of batter increased with the addition of gums

Kaparideki fenolik bileşenlerin özütlenmeside yeni bir yöntem: mikrodalga ile özütleme

TÜBİTAK TOVAG01.04.201

Yeni teknolojilerle baharatlardan esansiyel yağ ekstraksiyonu ve bu yağların fiziksel, antioksidan ve antimikrobiyal özellikleri

Bu çalışmanın amacı yeni ekstraksiyon teknolojileri kullanılarak Türkiye’de yetişen kekik, defne ve biberiye (esansiyel) uçucu yağlarının eldesidir. Farklı ekstraksiyon metodları ile elde edilen ürün yağ içeriği ve kompozisyonu açısından karşılaştırılmıştır. Ayrıca, farklı ekstraksiyon metodlarıyla elde edilen uçucu yağların antioksidan ve antimikrobiyal özellikleri tespit edilmiştir. Bu çalışmada, kekik ve defne için çözgensiz mikrodalga ekstraksiyonu (ÇME) ve biberiye için mikrodalga yardımlı hidrodistilasyon (MYH) kullanılmıştır. Ayrıca, baharatlardan yağ elde etmek için süperkritik akışkan ekstraksiyonu denenmiştir. Kontrol olarak hidrodistilasyon kullanılmıştır. ÇME ya da süperkritik karbondioksit ekstraksiyon metodlarının, hidrodistilasyonla kıyaslandığında daha fazla kekik uçucu yağı verdiği tespit edilmiştir. ÇME ve hidrodistilasyonla elde edilen uçucu yağların kompozisyonları dolayısıyla antioksidan ve antimikrobiyal aktiviteleri arasında önemli bir fark bulunmazken süperkritik akışkan ekstraksiyonu ile elde edilen yağın kompozisyonu farklı bulunmuştur. ÇME yönteminde hidrodistilasyona göre işlem süresi %80 azalmıştır. ÇME ve hidrodistilasyon yöntemleriyle elde edilen defne yağları arasında verim, antioksidan ve antimikrobiyal aktivite bakımından önemli bir fark bulunmamıştır. ÇME yöntemi kullanıldığında işlem süresinin hidrodistilasyona göre % 55-60 oranında kısaldığı görülmüştür. En yüksek verim süperkritik karbondioksit ekstraksiyonunda elde edilirken, en çok oksijenli bileşen miktarı ÇME yöntemi kullanıldığında elde edilmiştir. Biberiye yaprakları suyu yeterince emmediği için ÇME yöntemi bu bitki için başarılı olmamış ve onun yerine MYH metodu kullanılmıştır. Bu metod, hidrodistilasyona göre işlem süresini % 65 oranında kısaltmıştır. MYH metodu ile hidrodistilasyona ve süperkritik akışkan ekstraksiyonuna göre daha fazla oksijenli bileşen elde edilmiştir. MYH metodu ve hidrodistilasyon ile elde edilen biberiye uçucu yağları antioksidan ve antimikrobiyal aktiviteleri açısından benzerlik göstermiştir. Hidrodistilasyona göre daha kısa sürede daha kaliteli yağ elde edilen çözgensiz mikrodalga ekstraksiyonu kekik ve defne için ve mikrodalga yardımlı hidrodistilasyon biberiye için en uygun ekstraksiyon metodları olarak seçilmiştir.The objective of this study is to extract essential oils of oregano, laurel and rosemary which are widely grown in Turkey by using novel extraction methods. The essential oils obtained from different extraction methods were compared with respect to yield and composition. In addition, the antimicrobial and antioxidant properties of the essential oils obtained using different extraction methods were determined. In this study, solvent free microwave extraction (SFME) for oregano and laurel and microwave assisted hydrodistillation (MAHD) for rosemary were used. In addition, extractions were performed using supercritical carbondioxide extraction (SFE) method. Essential oils were also obtained using hydrodistillation method as control. SFME and supercritical carbondioxide extraction offered significantly higher oregano essential oil yield as compared to hydrodistillation. While no significant difference was obtained in the compositions and consequently antioxidant and antimicrobial activities of oregano essential oils obtained by SFME and hydrodistillation, the composition was quite different in the case of SFE. Conventional process time was reduced by 80% in SFME. No significant differences were obtained between SFME and hydrodistillation with respect to both yield and antioxidant and antimicrobial activities of laurel oil. The process time was reduced by 55-60% when SFME was used. The highest yield was obtained in SFE while the concentration of oxygenated compounds was the highest in SFME. In the extraction of essential oils from oregano (Origanum vulgare L.) and laurel (Laurus nobilis L.) SFME gave good results but it couldn’t be applied for the extraction of essential oil from rosemary. Therefore, in the case of rosemary, MAHD was used. MAHD reduced process time by 65 % as compared to hydrodistillation. Significantly higher amounts of oxygenated compounds were detected in the essential oils extracted by MAHD than by hydrodistillation and SFE. Rosemary essential oils obtained by hydrodistillation and MAHD were not different with respect to their antioxidant and antimicrobial activities. SFME was found to be a simple, time saving method and a good alternative for the extraction of essential oils from oregano and laurel. In rosemary, MAHD can be used as an alternative

Expression of PCNA, MMP-9 and P53 in bovine ocular squamous cell carcinomas: An immunohistochemical study

In this study, we aimed to compare and correlate the PCNA, MMP-9 and p53 expressions and differentiation degree of bovine ocular squamous cell carcinomas (BOSCCs) by immunohistochemical methods. The material of this study was composed of BOSCC biopsy samples taken from 30 cattle brought to our department. Tissue samples were fixed in 10% buffered formalin, processed routinely, embedded in paraffin, sectioned at 5 μm, and stained with hematoxylin & eosin in order to detect histopathological changes. Sections were examined and photographed under a light microscope. Avidin-biotin-peroxidase method was used for immunohistochemistry. Macroscopically the masses were nodular to cauliflower-like shaped. The surfaces of the masses were highly hemorrhagic and ulcerative, and sometimes covered with a purulent discharge. Histopathologically, we defined cases with excessive and large numbers of keratin pearls, large tumoral islands, and evident squamous differentiation as well-differentiated. Cases with smaller tumoral islets, decreased number and size of keratin pearls, but higher number of poorly-differentiated cells compared to well-differentiated cases were defined as moderately-differentiated. Tumors in which keratinization was either absent or formed in individual cells were classified as poorly-differentiated. Statistical analysis revealed that there was no significant difference between well, moderately, and poorly differentiated tumors in terms of PCNA and MMP-9 expressions, but we found that the increase in p53 expression negatively correlated with the degree of differentiation of the tumor. In conclusion, we think that p53 can be a useful marker in determining the prognosis of BOSCCs

Heat and mass transfer during frying

Ph.D. - Doctoral Progra

Effects of frying parameters on the colour development of fried potatoes

The effects of frying time and temperature on the colour development of potatoes during frying was studied. Potato disks 0.025 m in diameter and 0.005 m thick were used. Sunflower oil was used as a frying medium at temperatures 150 degrees C, 160 degrees C, 170 degrees C and 180 degrees C. Colour parameters of Hunter L and b values followed first-order reaction kinetics during frying. The temperature dependence of the rate constants for Hunter L and b values showed good agreement with Arrhenius relation, the activation energies, Ea, being equal to 22.67 kcal/mol and 17.13 kcal/mol, respectively. Hunter a value increased as frying time and/or temperature increased. A multiple regression equation was developed for total colour change as a function of time and temperature. The increase in time and temperature increased total colour change