3161 research outputs found
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Microcrystalline cellulose addition effects on the properties of wood cement boards
No full textThe study investigates the performance of microcrystalline cellulose (MCC) as reinforcer in
cementitious wood particle products. The wood cement boards were produced with various MCC
amounts, up to 30 wt % based on wood particle weight. Physical, thermal and mechanical
properties of MCC added wood cement boards were investigated and compared with conventional
wood cement boards. The water absorption and shrinkage of cement panels decreased at low MCC
additions, but increased at high rates of MCC. The highest values of the MOR and IB of the wood
cement boards were observed at 5% and 10% MCC content, respectively. When used above this
ratio, the MOR values were significantly reduced. The dispersion effect of MCC depending its ratio
in cement matrix was observed with scanning electron microscope. Although the possibility of
overlapping of wood component (lignin) and cement hydrate [Ca(OH)2] signals due to the high
decomposition temperature of lignin challenged the determination of Ca(OH)2 amount, one of the
cement hydration products, TGA/DTG results demonstrated that as the MCC content in the wood
cement boards increased, the decomposition amount of Ca(OH)2 increased. This indicates that
mcc improved the cement hydration, compared to spruce wood. In terms of DSC results, the
addition of MCC to the wood cement boards lowered the temperature and increased the enthalpy
and peak height
Modulating of food glycemic response by lactic acid bacteria
No full textThere are some strategies for modulating the glycemic response of food through synthesized metabolites such as organic acids, fatty acids, sugar alcohols, bioactive peptides, and exopolysaccharides by bacteria, yeast, and/or fungi during fermentation. The different species of lactic acid bacteria (LAB) are the most important option in fermented food production because they are considered food-grade, their products can be directly used in food, their usability of a cheap and wide range of substrate, and suitable for genetic modification. They can contribute to lowering the glycemic load of nutrition through their organic acid, alcohol, polysaccharides, and vitamin production. This study aimed to review the effects of lowering the glycemic responses of foods by LAB via metabolites produced and their contribution to human well-being in this way
Heterologous expression, biochemical characterisation and computational analysis of Bacteroides fragilis enolase
No full textBacteriodes fragilis is an anaerobic bacterium found in the human intestinal flora. In this study, BfEno was targeted with a structure-based drug design approach because inhibition of this enzyme may prevent both the aerobic and anaerobic pathways due to its role in the glycolytic pathway. First, the gene encoding BfEno was cloned, expressed and the protein produced over 95% purity. The Km and Vmax values of BfEno were determined as 314.9 µM and 256.2 µmol/min.mg, respectively. Drug-like chemicals were retrieved from the ZINC database for high-throughput virtual screening analyses. As a result of screening study, the ZINC91441604 has been proposed to bind to the active site of the enzyme and remain stable. The same compound exhibited weak binding to the human enolases than the bacterial enolase. Hence, ZINC91441604 may be proposed as a novel candidate for further in vitro and in vivo drug analysis towards the treatment of B. fragilis infections
Assessment of rainfall-induced landslide susceptibility in Artvin, Turkey using machine learning techniques
No full textIn this study, the performances of machine learning models, such as artificial neural networks (ANN), gradient-boosting machines (GBM), random forest (RF) and support vector machines (SVM) in rainfall-induced landslide susceptibility mapping were evaluated. For this purpose, the Arhavi, Hopa and Kemalpaşa districts of Artvin, which is one of the highest rainfall areas in Turkey, were identified as the study area. A landslide inventory comprising 533 landslide polygons (3959 pixels at 10-m resolution) was used; 70% of the pixels showing the landslides were used for training the models and the remaining 30% were used to validate the models. For landslide susceptibility modelling, 13 factors associated with landslides were considered. The area under the receiver operating characteristic curve was found to reveal the predictive capabilities of the models. As a result, the prediction rates of the ANN, SVM, RF and GBM models were found to be 93.8%, 94.8%, 96.1%, and 97%, respectively. According to the results, the GBM outperformed other models
Zoom fatigue, psychological distress, life satisfaction, and academic well-being
No full textLittle is known about the psychological consequences of the recently increased utilization of videoconferencing,
which has enabled life to proceed as close to normal as possible during the COVID-19 pandemic. To understand
the psychological consequences of this recent global lifestyle change in different populations, the psychometric
validation of the Zoom Exhaustion and Fatigue Scale (ZEFS) and the relationship of this construct with
academic well-being, mental well-being, and life satisfaction are presented. In a sample of 470 Turkish
university students (57 percent female, Mage = 20.26 – 2.18, ranging between 18 and 33 years), first-order and
second-order confirmatory factor analyses confirmed the construct validity of the scale, and the item response
theory results yielded appropriate item difficulty and discrimination. ZEFS scores were significantly and
positively associated with anxiety, depression, and stress, and negatively associated with life satisfaction and
academic well-being, supporting the scale’s concurrent validity. Incremental validity was shown with mediational models demonstrating significant and separate indirect effects of Zoom exhaustion and fatigue on life
satisfaction and academic well-being, both mediated by psychological distress. The results suggest ZEFS to be a
valid and reliable tool to evaluate the psychological consequences of videoconferencing, which has globally
increased during the COVID-19 pandemic, in non-Western samples. By showing the relationships of Zoom
exhaustion and fatigue with psychological distress, life satisfaction, and academic well-being, the present study
highlights potential avenues to be addressed to protect the mental well-being of all individuals who have
integrated videoconferencing as part of their daily lives
Land surface temperature change observation and spatial area determination with satellite ımages in the fire area
No full textOrmanların kaybını önlemek amacıyla yangınlarla mücadele son derece önemli bir problemdir. Gelişen teknolojiyle birlikte zaman içerisinde uydu görüntüleri yangınlarla mücadelede için temel gereçlerden biri haline gelmiştir. Çeşitli indeksler kullanılarak, görüntü işleme analizleri ve yüzey sıcaklık analizleri ile uydu görüntüleri üzerinden yanan alanın tespitini yapmak mümkündür. Yersel ölçümlerle yapılan yöntemlerin aksine oldukça hızlı ve nispeten daha az maliyetlidir. Bu çalışmada Landsat-8 uydu görüntüleri kullanılarak 1 Temmuz 2017’de İzmir ili Menderes ilçesinde gerçekleşen ve yaklaşık 67 saat süren Deliömerli orman yangını analiz edilmiştir. Yangın öncesi ve yangın anı için elde edilen görüntülerden yer yüzey sıcaklık haritaları oluşturularak, farklı arazi kullanımları için yüzey sıcaklık farklılıkları incelenmiştir. Buna göre yangın anında yanan alanın yüzey sıcaklığının diğer arazi kullanım alanlarına göre arttığı gözlemlenmiştir. Yangın alanı tespitinde ise üç farklı yöntem kullanılıp yangın alanı mekânsal büyüklüğü karşılaştırılmıştır. Bu kapsamda Normalize Edilmiş Bitki Örtüsü İndeksi (NDVI) ile 1.235 hektar alanın, Normalize Edilmiş Yanma Şiddeti (NBR) indeksleri ile 1.221 hektar alanın ve sınıflandırma çalışması sonrası ise 1.296 hektar alanın yandığı tespit edilmiştir. Sonuçların Orman Genel Müdürlüğü tarafından açıklanan hasar tespit sonuçları ile tutarlı olduğu gözlenmiştir. CORINE arazi kullanım haritası ve yanan alanlar örtüştürülerek yangın sonucunda arazi kullanım sınıflarının yangından ne kadar etkilendiği incelenmiştir. Yapılan örtüşme analizi sonucunda yanan alanın %75,7’sinin iğne yapraklı ormanlar, %19,3’ünün bitki alanları, %4,2’sinin karışık ormanlar ve %0,7’sinin tarım alanları olduğu tespit edilmiştir.Fighting fires is an extremely important issue to prevent the loss of forests. With the developing technology, satellite images have become one of the basic tools for fighting fire over time. By using various indexes, it is possible to detect the burning area from satellite images with image processing analysis and surface temperature analysis. Unlike the methods made by ground measurements, it is very fast and relatively less costly. In this study, the Deliömerli forest fire that took place in Menderes district of Izmir province on July 1, 2017, and lasted about 67 hours was analyzed using Landsat-8 satellite images. The surface temperature maps were created from the images obtained before and during the fire, and surface temperature differences were examined for different land uses. Accordingly, it has been observed that the surface temperature of the area burning during the fire increased compared to other land use areas. In determining the fire area, three different methods were used and the spatial size of the fire area was compared. In this context, 1,235 hectares with Normalized Difference Vegetation Index (NDVI), 1,221 hectares with Normalized Burn Ratio (NBR) indices, and 1,296 hectares with the classification study were determined to be burned. It has been observed that the results are consistent with the damage assessment results announced by the General Directorate of Forestry. The burning areas were overlapped with the CORINE land use map and the extent of the impact of the fire on each land use class was examined. As a result of the overlap analysis, it was determined that 75.7% of the burning area was coniferous forests, 19.3% plant areas, 4.2% mixed forests and 0.7% agricultural areas
Automated extraction of road information from UAV-based data
No full textWhen it comes to monitoring the condition of roads, UAV technology can overcome many of the downsides associated with traditional methods, which can be time-consuming, labour-intensive and sometimes subjective. This article explores the opportunities for automated extraction of UAV-based data information about road construction, inventory and road environments
Growing threat to community health: vaccine rejection
Full text linkDünyada ve Türkiye’de halk sağlığını tehdit eden ‘aşı reddi’ sorunu
giderek artmaktadır. Aşı reddi, bireyin kendi iradesini kullanarak
tüm aşıları ve aşılanmayı reddetmesidir. Aşı reddinin nedenleri ülkeden ülkeye, bölgeden bölgeye farklılık gösterebilmektedir. Birleşmiş Milletler Çocuklara Yardım Fonu verilerine göre tüm dünyada
20 milyon aşısız çocuk bulunmaktadır. Aşı reddi sorununun küresel
düzeyde artışı, salgın şeklinde bulaşıcı hastalıkların görülmesi üzerine Dünya Sağlık Örgütü 2019 küresel sağlık sorunları içinde aşı
reddine de yer vermiştir. Aşı reddinin artması ve aşılanma oranlarının azalması ile başta bulaşıcı hastalıklar olmak üzere zamanla
pek çok olumsuz sonuç meydana geleceği öngörülmektedir. Temel
amacı sağlığı koruma ve geliştirme olan hemşirelerin, aşı reddinin
önlenmesinde birey ve ailelerin aşıya yönelik düşüncelerini belirleyip doğru bilginin aktarılmasında eğitim ve danışmanlık sağlayarak
sorunun büyümesine engel olabilir. Bu derlemede aşı reddi ve aşı
reddinin önlenmesine yönelik önerilere yer verilmiştirThe issue of “vaccine refusal” that threatens public health is gradually increasing in the world and in Turkey. Vaccine refusal is the individual’s own willingness to refuse all vaccins and vaccinations. The
reasons for vaccine refusal may differ from country to country and
from region to region. According to the United Nations Children’s
Fund data, there are 20 million unvaccinated children worldwide. As
the issue of vaccine refusal increases globally and infectious diseases emerge in the form of epidemics, the World Health Organization
has also included vaccine refusal among the global health issues of
2019. With the increase in vaccine refusal and decreasing vaccination rates, it is predicted that many negative consequences will occur
over time, especially infectious diseases. The nurse’s, whose main
purpose is to protect and improve health, can prevent the growth of
the problem by determining the opinions of individuals and families
about vaccination in the prevention of vaccine refusal and providing
education and consultancy in the transfer of correct knowledge. In
this review, recommendations for vaccine refusal and prevention of
vaccine refusal is discussed
Investigating the impact of activities based on scientific process skills on 4th grade students’ problem-solving skills
No full texthe purpose of this research is to examine the impact of activities based on scientific process skills on problem-solving skills of 4th grade students in science lessons. In the study a non-equivalent control group pre-test and post-test design type of quasi-experimental method was used. The research study group was composed of 30 students with 15 each in the experimental study group and control group. In the experimental and control groups, for scientific process skills, the “Scientific Process Skills Test (SPS)”,and for problem-solving skills, the “Problem Solving Inventory for Children at Elementary Education Level (PSIC)” were used as pre-test and post-tests. Activities including scientific process skills in the experimental group were applied for 8 weeks and 16 lesson hours, while no intervention was made to the control group. In the data analysis process, the Mann-Whitney U test and Wilcoxon Signed-Rank test were used. According to the data obtained from the research, it was observed that there was a significant difference in the post-test scores in the Scientific Process Skills Test (SPST) and the Problem-Solving Inventory for Children (PSIC) of the students in the experimental group compared to the students in the control group. According to these findings, it can be stated that activities including scientific process skills develop problem-solving skills of students in primary science education
Effects of Power Distance on Organizational Commitment: A Study on Maritime Faculty Students
No full textThis study investigates the effect of power distance on the organizational commitment of maritime faculty students. The hypotheses
developed in this context were analyzed using the structural equation modeling method based on data collected from 406 participants. The
results from one-dimensional (1D) evaluation indicated that organizational power distance had a positive impact on the organizational
commitment levels of maritime faculty students. However, there are several studies in the literature that show that this effect may lead to
inconsistent results in 1D examination. These conflicting results necessitate a multidimensional analysis of the research. Evaluation of the
sub-dimensions included in the study revealed that: (1) acceptance of power had positive effects on calculative and moral commitment, (2)
justification of power on moral commitment, and (3) acquiescence of power on calculative, alienative, and moral commitment