Pub Date : 2023-07-13DOI: 10.16984/saufenbilder.1253136
Özlem Kahraman, Erdem Köymen
Energy is an effective factor that needs to be solved for efficiency in architecture, as in many other fields. For this reason, planned and strategic steps should be taken from the early stage of the building production process in terms of the effective use of energy. The form that the building will take varies according to the climatic characteristics. Therefore, the building should be designed with attention to environmental factors.. “Compactness”, which is a geometrical sub-concept of the building form, is one of the most important factors in terms of heat loss and gain of the building. The concept of compactness, which is related to all of the above contexts, constitutes the main motivation of this research. In the study, the extent to which the theoretical knowledge of compactness is applied in the practice of the formation of winter tourism accommodation structures and the differences in the formation of the buildings according to the regions that occur as a result of this was investigated. In this study, cold climate zone structures were preferred because they present a restrictive plane where compactness is more comparable in terms of form. In the study, 50 accommodation structures in different regions of Türkiye, which are the most preferred in terms of winter tourism, were evaluated with an original approach based on compactness. The data of the selected structures were transferred to a table, and compactness ratios were obtained by superposing the original and compact plan projections. As a result, it was seen that increasing the surface area in accommodation structures with relatively small floor areas greatly affects the compactness ratio, there is a linear ratio between the increase in the floor area and the number of floors, and there is no specialized building form and main facade direction for any region.
{"title":"Examination of Winter Tourism Accommodation Building Form in Term of Compactity: the Example of Türkiye","authors":"Özlem Kahraman, Erdem Köymen","doi":"10.16984/saufenbilder.1253136","DOIUrl":"https://doi.org/10.16984/saufenbilder.1253136","url":null,"abstract":"Energy is an effective factor that needs to be solved for efficiency in architecture, as in many other fields. For this reason, planned and strategic steps should be taken from the early stage of the building production process in terms of the effective use of energy. The form that the building will take varies according to the climatic characteristics. Therefore, the building should be designed with attention to environmental factors.. “Compactness”, which is a geometrical sub-concept of the building form, is one of the most important factors in terms of heat loss and gain of the building. The concept of compactness, which is related to all of the above contexts, constitutes the main motivation of this research. In the study, the extent to which the theoretical knowledge of compactness is applied in the practice of the formation of winter tourism accommodation structures and the differences in the formation of the buildings according to the regions that occur as a result of this was investigated. In this study, cold climate zone structures were preferred because they present a restrictive plane where compactness is more comparable in terms of form. In the study, 50 accommodation structures in different regions of Türkiye, which are the most preferred in terms of winter tourism, were evaluated with an original approach based on compactness. The data of the selected structures were transferred to a table, and compactness ratios were obtained by superposing the original and compact plan projections. As a result, it was seen that increasing the surface area in accommodation structures with relatively small floor areas greatly affects the compactness ratio, there is a linear ratio between the increase in the floor area and the number of floors, and there is no specialized building form and main facade direction for any region.","PeriodicalId":21468,"journal":{"name":"Sakarya University Journal of Science","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89951482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-12DOI: 10.16984/saufenbilder.1295714
M. Eryildiz
Interbody fusion is utilized as a treatment for spinal degenerative diseases. Spinal cages, also known as intervertebral cages or interbody fusion devices, are implants employed in spinal surgery to address these conditions and promote spinal stability. These cages are inserted into the intervertebral space between adjacent vertebrae, replacing the damaged or degenerated disc. Spinal cages aid in the distribution of loads and stress at the fusion site and often incorporate a dedicated area for bone graft material. In this study, a topology optimization approach was employed to develop distinct spinal cages featuring a bone graft window. The mechanical behavior of the spinal cages under loading conditions was simulated and evaluated using finite element analysis. Following optimization, a finite element model analysis estimated the maximum stresses and compared them to the initial model. For topology optimization, reductions of 30%, 50%, and 70% in mass were defined. Both the 50% and 70% mass-reduced designs, featuring an open window, are deemed suitable for bone graft placement and stress distribution.
{"title":"Topology Optimization of Spinal Cage Designs for Improved Stress Distribution and Bone Graft Window","authors":"M. Eryildiz","doi":"10.16984/saufenbilder.1295714","DOIUrl":"https://doi.org/10.16984/saufenbilder.1295714","url":null,"abstract":"Interbody fusion is utilized as a treatment for spinal degenerative diseases. Spinal cages, also known as intervertebral cages or interbody fusion devices, are implants employed in spinal surgery to address these conditions and promote spinal stability. These cages are inserted into the intervertebral space between adjacent vertebrae, replacing the damaged or degenerated disc. Spinal cages aid in the distribution of loads and stress at the fusion site and often incorporate a dedicated area for bone graft material. In this study, a topology optimization approach was employed to develop distinct spinal cages featuring a bone graft window. The mechanical behavior of the spinal cages under loading conditions was simulated and evaluated using finite element analysis. Following optimization, a finite element model analysis estimated the maximum stresses and compared them to the initial model. For topology optimization, reductions of 30%, 50%, and 70% in mass were defined. Both the 50% and 70% mass-reduced designs, featuring an open window, are deemed suitable for bone graft placement and stress distribution.","PeriodicalId":21468,"journal":{"name":"Sakarya University Journal of Science","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139360059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-08DOI: 10.16984/saufenbilder.1215972
T. Yontan, Seliz Koç
This study presents structural and fundamental astrophysical parameters of poorly studied open cluster NGC 2509. We used the third photometric and astrometric data release of the Gaia (Gaia DR3) to perform analyses. By taking into account the Gaia DR3 astrometric data, we calculated the membership probabilities of the stars in the region of NGC 2509. As a result of the membership analysis, 244 stars with membership probabilities P 50% were determined as the physical members of the cluster. The colour excess, distance and age were obtained simultaneously by fitting solar metallicity PARSEC isochrones to G×GBP-GRP colour-magnitude diagram. We considered the most likely cluster member stars during the fitting procedure and calculated the colour excess, distance and age of the NGC 2509 as E(GBP-GRP) = 0.100±0.184 mag, d = 2518±667 pc and t = 1.5±0.1 Gyr, respectively.
本研究介绍了研究较少的疏散星团NGC 2509的结构和基本天体物理参数。我们使用 Gaia 第三次发布的测光和天体测量数据（Gaia DR3）进行分析。根据 Gaia DR3 的天体测量数据，我们计算了 NGC 2509 区域内恒星的成员概率。经过成员分析，我们确定了 244 颗成员概率为 P 50%的恒星为该星团的物理成员。通过将太阳金属度 PARSEC 等时线与 G×GBP-GRP 色-星等图进行拟合，我们同时得到了色超、距离和年龄。在拟合过程中，我们考虑了最有可能的星团成员星，并计算出NGC 2509的色超、距离和年龄分别为E(GBP-GRP) = 0.100±0.184 mag, d = 2518±667 pc 和 t = 1.5±0.1 Gyr。
{"title":"Astrophysical Parameters of the Open Cluster NGC 2509","authors":"T. Yontan, Seliz Koç","doi":"10.16984/saufenbilder.1215972","DOIUrl":"https://doi.org/10.16984/saufenbilder.1215972","url":null,"abstract":"This study presents structural and fundamental astrophysical parameters of poorly studied open cluster NGC 2509. We used the third photometric and astrometric data release of the Gaia (Gaia DR3) to perform analyses. By taking into account the Gaia DR3 astrometric data, we calculated the membership probabilities of the stars in the region of NGC 2509. As a result of the membership analysis, 244 stars with membership probabilities P 50% were determined as the physical members of the cluster. The colour excess, distance and age were obtained simultaneously by fitting solar metallicity PARSEC isochrones to G×GBP-GRP colour-magnitude diagram. We considered the most likely cluster member stars during the fitting procedure and calculated the colour excess, distance and age of the NGC 2509 as E(GBP-GRP) = 0.100±0.184 mag, d = 2518±667 pc and t = 1.5±0.1 Gyr, respectively.","PeriodicalId":21468,"journal":{"name":"Sakarya University Journal of Science","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139361357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-07DOI: 10.16984/saufenbilder.1265076
Merve Yilmaz, Muharrem Ünver
With the advancement of technology, the pressure on personnel in corporate operations has been reduced and productivity has increased. However, many industries continue to profit from labor. MSD can develop as a result of poor working conditions and repetitive movements. This research was carried out in a forest products enterprise with two facilities in Western Black Sea Region. The company produces construction timber using Fir and Pine as the base material. First, the demographic information of the field workers was obtained, then the musculoskeletal diseases of the local parts of the body were examined by using the Cornell (CMDQ) questionnaire. In the second step, REBA analysis was performed independently for the workstations determined in the company. According to the CMDQ study, employees reported the most strain on the lower back, back, and right wrist. It was determined that the most discomfort was in the lumbar region (35.90%). Again, according to the pain felt, it was seen that the most obstacles to work were caused by the waist, right upper leg and back. Scores overlap according to the common body regions evaluated in the Cornell and REBA analysis.
{"title":"Ergonomic Risk Assessment in the Forest Products Industry","authors":"Merve Yilmaz, Muharrem Ünver","doi":"10.16984/saufenbilder.1265076","DOIUrl":"https://doi.org/10.16984/saufenbilder.1265076","url":null,"abstract":"With the advancement of technology, the pressure on personnel in corporate operations has been reduced and productivity has increased. However, many industries continue to profit from labor. MSD can develop as a result of poor working conditions and repetitive movements. This research was carried out in a forest products enterprise with two facilities in Western Black Sea Region. The company produces construction timber using Fir and Pine as the base material. First, the demographic information of the field workers was obtained, then the musculoskeletal diseases of the local parts of the body were examined by using the Cornell (CMDQ) questionnaire. In the second step, REBA analysis was performed independently for the workstations determined in the company. According to the CMDQ study, employees reported the most strain on the lower back, back, and right wrist. It was determined that the most discomfort was in the lumbar region (35.90%). Again, according to the pain felt, it was seen that the most obstacles to work were caused by the waist, right upper leg and back. Scores overlap according to the common body regions evaluated in the Cornell and REBA analysis.","PeriodicalId":21468,"journal":{"name":"Sakarya University Journal of Science","volume":"44 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139362048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-06DOI: 10.16984/saufenbilder.1261904
Mehzat Altun
In recent years, dramatically rising multidrug-resistant bacteria (MDR) and side effects of antibiotics lead ethnopharmacology to discover novel antimicrobials derived from plants for bacterial infections. Traditionally, decoction or infusion of the species of Sideritis has been used for the treatment of diseases such as cough, stomach, gastrointestinal, and kidney disorders. In this study, we aimed to investigate the antioxidant and antibacterial activity of the ethanolic extract of Sideritis trojana (S.trojana) and its synergistic potential with antibiotics against human pathogens. Gas chromatography-mass spectrometry (GC-MS), Folin- Ciocalteu, 1-diphenyl-2-picrylhydrazyl radical (DPPH), disc diffusion, and minimum inhibitory concentration (MIC) assays were used for identifying phytochemicals, total phenolic content (TPC), antioxidant, and antibacterial activity of ethanolic extract of S.trojana alone and binary combination with selected antibiotics against Gram-positive and Gram-negative bacterial strains, respectively. Furthermore, the combined effects of the extract with classical antibiotics were evaluated by measuring the inhibition zone diameter (IZD). The S.trojana extract showed moderate antibacterial activity with the MIC ranging between 15.625 to 500 µg/mL against human pathogens and the synergistic effect was detected in a dual combination of extract and antibiotics. The extract exhibited high antioxidant activity with a low IC50 value (0.138±0.010 mg/mL). The TPC value was 47.95±0.24 (mg GAE/g extract). After measurements of cytotoxicity were performed, S.trojana can be used alone or combined with antibiotics as an alternative therapy to eliminate pathogens and can be preferred as an antioxidant agent in the pharmaceutical industry.
{"title":"Phytochemical Components, Antioxidant, Antibacterial, and Synergistic Effects of Endemic Sideritis trojana Extract in Combination with Antibiotics on Human Pathogens","authors":"Mehzat Altun","doi":"10.16984/saufenbilder.1261904","DOIUrl":"https://doi.org/10.16984/saufenbilder.1261904","url":null,"abstract":"In recent years, dramatically rising multidrug-resistant bacteria (MDR) and side effects of antibiotics lead ethnopharmacology to discover novel antimicrobials derived from plants for bacterial infections. Traditionally, decoction or infusion of the species of Sideritis has been used for the treatment of diseases such as cough, stomach, gastrointestinal, and kidney disorders. In this study, we aimed to investigate the antioxidant and antibacterial activity of the ethanolic extract of Sideritis trojana (S.trojana) and its synergistic potential with antibiotics against human pathogens. Gas chromatography-mass spectrometry (GC-MS), Folin- Ciocalteu, 1-diphenyl-2-picrylhydrazyl radical (DPPH), disc diffusion, and minimum inhibitory concentration (MIC) assays were used for identifying phytochemicals, total phenolic content (TPC), antioxidant, and antibacterial activity of ethanolic extract of S.trojana alone and binary combination with selected antibiotics against Gram-positive and Gram-negative bacterial strains, respectively. Furthermore, the combined effects of the extract with classical antibiotics were evaluated by measuring the inhibition zone diameter (IZD). The S.trojana extract showed moderate antibacterial activity with the MIC ranging between 15.625 to 500 µg/mL against human pathogens and the synergistic effect was detected in a dual combination of extract and antibiotics. The extract exhibited high antioxidant activity with a low IC50 value (0.138±0.010 mg/mL). The TPC value was 47.95±0.24 (mg GAE/g extract). After measurements of cytotoxicity were performed, S.trojana can be used alone or combined with antibiotics as an alternative therapy to eliminate pathogens and can be preferred as an antioxidant agent in the pharmaceutical industry.","PeriodicalId":21468,"journal":{"name":"Sakarya University Journal of Science","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139362437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-04DOI: 10.16984/saufenbilder.1278990
Yiğit Can Yardimci
Architects have difficult working conditions due to the profession of architecture and they stay in the working environment during intensive working hours. For this reason, it is important to improve the comfort conditions in the working environment for architects to feel physically and psychologically better. The aim of this study is to evaluate the comfort conditions in the working environment of architects working in Bursa. In this direction, 203 architects were reached and a questionnaire was used as a data collection tool. The questionnaire consists of 2 stages. The first phase includes demographic characteristics and the second phases includes questions about comfort conditions. When the comfort conditions of the architects were examined; it was seen that they were satisfied with the sub-factors of artificial lighting, indoor temperature and natural ventilation adequacy, indoor air quality, absence of bad odors in the working environment, seat ergonomics, equipment adequacy. However, they feel uncomfortable about the auditory conditions in the working environment. When the correlation between demographic characteristics and comfort conditions in the working environment is examined, the correlation coefficients are in the range of 0-0.20, indicating that demographic characteristics have a very weak or no relationship with comfort conditions in the working environment.
{"title":"A Research on Architects’ Comfort Conditions in Working Enviroments","authors":"Yiğit Can Yardimci","doi":"10.16984/saufenbilder.1278990","DOIUrl":"https://doi.org/10.16984/saufenbilder.1278990","url":null,"abstract":"Architects have difficult working conditions due to the profession of architecture and they stay in the working environment during intensive working hours. For this reason, it is important to improve the comfort conditions in the working environment for architects to feel physically and psychologically better. The aim of this study is to evaluate the comfort conditions in the working environment of architects working in Bursa. In this direction, 203 architects were reached and a questionnaire was used as a data collection tool. The questionnaire consists of 2 stages. The first phase includes demographic characteristics and the second phases includes questions about comfort conditions. When the comfort conditions of the architects were examined; it was seen that they were satisfied with the sub-factors of artificial lighting, indoor temperature and natural ventilation adequacy, indoor air quality, absence of bad odors in the working environment, seat ergonomics, equipment adequacy. However, they feel uncomfortable about the auditory conditions in the working environment. When the correlation between demographic characteristics and comfort conditions in the working environment is examined, the correlation coefficients are in the range of 0-0.20, indicating that demographic characteristics have a very weak or no relationship with comfort conditions in the working environment.","PeriodicalId":21468,"journal":{"name":"Sakarya University Journal of Science","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80744390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-03DOI: 10.16984/saufenbilder.1265507
Tuğçe UNUTKAN GÖSTERİŞLİ
In this study, a high performance liquid chromatography-ultraviolet detection method was introduced for the detection of cymoxanil. The experimental parameters of the procedure were thoroughly evaluated. Cymoxanil was eluted by ammonium formate buffer (50.0 mM, pH 4.0):acetonitrile (55:45 v/v) as mobile phase. Under the optimal conditions, the limits of detection and quantification (LOD and LOQ) were found as 7.4 – 24.8 µg kg-1, which allows trace determination of pesticides in food samples. Proposed method was then implemented for the determination of selected fungicide in potato flour samples with acceptable % recoveries in the range of 81.4–112.9%, while the values of relative standard deviation (RSD) were below 10% showing a satisfactory applicability for cymoxanil in such complex real samples matrix.
{"title":"Development of an Analytical Method for the Determination of Cymoxanil in Potato Flour Samples by High Performance Liquid Chromatography","authors":"Tuğçe UNUTKAN GÖSTERİŞLİ","doi":"10.16984/saufenbilder.1265507","DOIUrl":"https://doi.org/10.16984/saufenbilder.1265507","url":null,"abstract":"In this study, a high performance liquid chromatography-ultraviolet detection method was introduced for the detection of cymoxanil. The experimental parameters of the procedure were thoroughly evaluated. Cymoxanil was eluted by ammonium formate buffer (50.0 mM, pH 4.0):acetonitrile (55:45 v/v) as mobile phase. Under the optimal conditions, the limits of detection and quantification (LOD and LOQ) were found as 7.4 – 24.8 µg kg-1, which allows trace determination of pesticides in food samples. Proposed method was then implemented for the determination of selected fungicide in potato flour samples with acceptable % recoveries in the range of 81.4–112.9%, while the values of relative standard deviation (RSD) were below 10% showing a satisfactory applicability for cymoxanil in such complex real samples matrix.","PeriodicalId":21468,"journal":{"name":"Sakarya University Journal of Science","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139364248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-30DOI: 10.16984/saufenbilder.1091181
C. Yaman
The aim of the current study is to determine the total flavonoids, phenolics and antioxidant activities of methanol extracts from aerial parts of four endemic Haplophyllum species to Türkiye (H. myrtifolium, H. vulcanicum, H. pumiliforme, and H. sahinii). There are two populations collected from different regions belonging to H. myrtifolium and H. pumiliforme. Antioxidant activities were measured by radical scavenging activity such as the 2, 2′-azino-bis-3-ethylbenzothiazoline-6-sulfonic acid (ABTS) and 2, 2-diphenyl-1-picrylhydrazyl (DPPH), and compared with synthetic standards such as trolox, ascorbic acid and butylated hydroxytoluene (BHT). The highest total bioactive contents were recorded as H. sahinii for total phenolic content (66.4 mg GAE/g extract) and H. myrtifolium for total flavonoid content (40.8 mg QE/g extract), but H. vulcanicum displayed the lowest amount for both contents (38.0 mg GAE/g extract and 34.5 mg QE/g extract, respectively). Among the species, H. myrtifolium exhibited the strongest DPPH and ABTS radical scavenging activity followed by H. pumiliforme, H. sahinii and H. vulcanicum. All Haplophyllum species showed higher antioxidant activity for these two radical scavenging activities than trolox and BHT. The phytochemicals and antioxidant activities in methanol extracts from these endemic Haplophyllum species is reported for the first time. The diversity of the findings is to be discussed as likely consequence of the different species and regions.
本研究旨在测定四种特有的单叶植物(H. myrtifolium, H. vulcanicum, H. pumiliformme和H. sahinii)地上部分甲醇提取物的总黄酮、酚类物质和抗氧化活性。从不同地区采集到的两个居群分别属于桃金娘属和矮毛蕊属。以2,2′-氮基-双-3-乙基苯并噻唑-6-磺酸(ABTS)和2,2 -二苯基-1-吡啶肼(DPPH)为自由基清除活性测定抗氧化活性，并与合成标准品三氯胺、抗坏血酸和丁基羟基甲苯(BHT)进行比较。总生物活性含量最高的是山楂总酚含量(66.4 mg GAE/g)和桃金娘总黄酮含量(40.8 mg QE/g)，而山楂的总生物活性含量最低(分别为38.0 mg GAE/g和34.5 mg QE/g)。其中，桃金娘对DPPH和ABTS自由基的清除能力最强，其次是矮毛蕊、沙希尼和vulcanicum。单叶植物对这两种自由基的清除活性均高于trolox和BHT。本研究首次报道了这些特有单叶植物甲醇提取物的化学成分和抗氧化活性。研究结果的多样性将作为不同物种和地区的可能结果进行讨论。
{"title":"Phytochemicals and Antioxidant Activities in methanol extracts of Endemic Haplophyllum Species from Türkiye","authors":"C. Yaman","doi":"10.16984/saufenbilder.1091181","DOIUrl":"https://doi.org/10.16984/saufenbilder.1091181","url":null,"abstract":"The aim of the current study is to determine the total flavonoids, phenolics and antioxidant activities of methanol extracts from aerial parts of four endemic Haplophyllum species to Türkiye (H. myrtifolium, H. vulcanicum, H. pumiliforme, and H. sahinii). There are two populations collected from different regions belonging to H. myrtifolium and H. pumiliforme. Antioxidant activities were measured by radical scavenging activity such as the 2, 2′-azino-bis-3-ethylbenzothiazoline-6-sulfonic acid (ABTS) and 2, 2-diphenyl-1-picrylhydrazyl (DPPH), and compared with synthetic standards such as trolox, ascorbic acid and butylated hydroxytoluene (BHT). The highest total bioactive contents were recorded as H. sahinii for total phenolic content (66.4 mg GAE/g extract) and H. myrtifolium for total flavonoid content (40.8 mg QE/g extract), but H. vulcanicum displayed the lowest amount for both contents (38.0 mg GAE/g extract and 34.5 mg QE/g extract, respectively). Among the species, H. myrtifolium exhibited the strongest DPPH and ABTS radical scavenging activity followed by H. pumiliforme, H. sahinii and H. vulcanicum. All Haplophyllum species showed higher antioxidant activity for these two radical scavenging activities than trolox and BHT. The phytochemicals and antioxidant activities in methanol extracts from these endemic Haplophyllum species is reported for the first time. The diversity of the findings is to be discussed as likely consequence of the different species and regions.","PeriodicalId":21468,"journal":{"name":"Sakarya University Journal of Science","volume":"106 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87739809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-21DOI: 10.16984/saufenbilder.1288073
Hakan SERİN, Muslu Kazım KÖREZ, Mehmet Emin TEKİN, Sinan SİREN
The biggest threat to the forests, which are natural habitats in European countries, as they are in the whole world, is forest fires. The aim of this study is to group the 38 European countries which have completely accessible fire indexes between the years 2008 to 2022; with respect to their similarities in fire regimes; and to compare the obtained groups with respect to their fire indexes. The clustering technique, which is a data mining method, was used while making these comparisons since it would be more objective and realistic to group and evaluate the countries according to their similarities. In the K-Means technique 2 clusters, and in the Ward's method 3 clusters were obtained. In the K-Means technique, significant statistical differences were found between the 2 clusters in terms of all fire indexes (p
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Pub Date : 2023-06-19DOI: 10.16984/saufenbilder.1125240
Zülküf İbrahim ERKOL, İrem DALOGLU
Büyük Menderes Basin is one of the largest basins in Turkey, with almost half of the basin area utilized for agricultural purposes. The amount of water allocated to the agricultural areas in the basin corresponds to 80% of water use in the watershed. Hence, the impact of climate change on the water supply in the Büyük Menderes Basin will be significant for the basin. In this study, we model the effects of climate change on the water budget (water supply and demand balance) of the Büyük Menderes Basin using the Water and Evaluation and Planning (WEAP) tool. Future precipitation, temperature, and evaporation data for the basin are attained from outputs of the HadGEM2-ES global circulation model (GCM), along with CNRM-CM5.1 and GFDL-ESM2M regional circulation models (RCM) for RCP 4.5 and RCP 8.5 scenarios. Subsequently, the study applies different statistical bias correction methods (Linear Scaling (LS), Distribution Mapping (DM), Local Precipitation Scaling (PLIS), and Power Transformation of Precipitation (PTP) for raw outputs of GCMs and RCMs and analyzes the changes in outcomes of projected climate data and the impact of changes on the hydrology of the basin using the WEAP model. For this analysis, calibrated and validated WEAP model for the 12 reservoirs of Büyük Menderes Basin is used to understand the impact of different bias correction methods on reservoir levels.
b y k Menderes盆地是土耳其最大的盆地之一，几乎一半的盆地面积用于农业目的。分配给流域农业区的水量相当于流域用水量的80%。因此，气候变化对b y k Menderes盆地供水的影响将对该盆地产生重大影响。在本研究中，我们利用水资源与评价与规划(WEAP)工具模拟了气候变化对b yy k Menderes盆地水收支(水供需平衡)的影响。该流域未来的降水、温度和蒸发数据来自HadGEM2-ES全球环流模式(GCM)以及CNRM-CM5.1和GFDL-ESM2M区域环流模式(RCM)在RCP 4.5和RCP 8.5情景下的输出。随后，对gcm和rcm的原始输出分别采用线性标度(LS)、分布映射(DM)、局地降水标度(PLIS)和降水功率变换(PTP)等不同的统计偏差校正方法，并利用WEAP模型分析了气候数据预估结果的变化及其对流域水文的影响。通过对b y k Menderes盆地12个储层的WEAP模型进行校准和验证，了解不同偏差校正方法对储层水位的影响。
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