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Akşit Aysun - One of the best experts on this subject based on the ideXlab platform.
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Farklı Kim-yasal Maddeler İle Modifiye Edilen Jüt Liflerinin Mekanik Ve Morfolojik Özelliklerinin İncelenmesi
Teorik ve Uygulamalı Mekanik Türk Milli Komitesi, 2017Co-Authors: Seki Yasemin, Akşit AysunAbstract:Bu calışmada, polimerik kompozit malzemelerde takviye elemanı olarak kullanılan jüt liflerinin farklı kimyasal maddeler ile yüzey modifikasyonu incelenmiştir. Bu amaçla, jüt iplikleri potasyum dikromat, potasyum permanganat ve sodyum perborat trihidratın %0,02'lik sulu çözeltileri ile muamele edilmiştir. Modifikasyon işlemlerinin etkinliği kızılötesi infrared spektrumu (FTIR) analizi, mukavemet testi ve lifin nem içeriği ve nem geri kazanımı performansının belirlenmesi ile değerlendirilmiştir. Ayrıca taramalı elektron mikroskobu (SEM) ve fluoresans mikroskop ile yüzey morfolojik özellikleri de incelenmiştir. FTIR analizi sonuçlarına göre yüzey modifikasyon işlemleri yüzey safsızlıklarını, hemiselüloz ve lignini azaltmıştır. Çalışma kapsamında uygulanan tüm modifikasyon işlemleri jüt ipliklerinin kopma mukavemetini ve modülünü istatistiksel olarak önemli derecede etkilerken, sadece sodyum perborat trihidrat muamelesi lifin nem içeriğini ve nem geri kazanımını önemli derecede azaltmıştır. Lif yüzeyinde modifikasyon işlemleri sonrası çatlakların meydana geldiği ve yüzey pürüzlülüğünün arttığı belirlenmiştir.The objective of this research is to investigate the chemical modification with different surface treatment agents on jute fiber for usability as reinforcement in polymeric composite materials. For this purpose, jute fibers were treated with 0.02% (w/v) aqueous solutions of Potassium Dichromate, Potassium permanganate and sodium perborate trihydrate. The effect of the treatments were assessed by fourier transform infrared spectroscopy (FTIR), tensile testing, determination of moisture content and moisture regain and also morphological observation by scanning electron microscopy (SEM) and fluorescence microscopy. The surface treatments decreased contents of surface impurities, lignin and hemicelluloses as confirmed by FTIR analysis. All of the surface treatments influenced the tensile strength and elasticity modulus of the jute yarns significantly whereas only sodium perborate trihydrate treatment decreased moisture related properties significantly. SEM micrographs showed that modification processes caused cracks and roughness on the surface of the jute fibers
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Farklı Kim-yasal Maddeler İle Modifiye Edilen Jüt Liflerinin Mekanik Ve Morfolojik Özelliklerinin İncelenmesi
Theoretical and Applied Mechanical Turkish National Committee, 2015Co-Authors: Seki Yasemin, Akşit AysunAbstract:Konferans Bildirisi -- Teorik ve Uygulamalı Mekanik Türk Milli Komitesi, 2015Conference Paper -- Theoretical and Applied Mechanical Turkish National Committee, 2015Bu calışmada, polimerik kompozit malzemelerde takviye elemanı olarak kullanılan jüt liflerinin farklı kimyasal maddeler ile yüzey modifikasyonu incelenmiştir. Bu amaçla, jüt iplikleri potasyum dikromat, potasyum permanganat ve sodyum perborat trihidratın %0,02'lik sulu çözeltileri ile muamele edilmiştir. Modifikasyon işlemlerinin etkinliği kızılötesi infrared spektrumu (FTIR) analizi, mukavemet testi ve lifin nem içeriği ve nem geri kazanımı performansının belirlenmesi ile değerlendirilmiştir. Ayrıca taramalı elektron mikroskobu (SEM) ve fluoresans mikroskop ile yüzey morfolojik özellikleri de incelenmiştir. FTIR analizi sonuçlarına göre yüzey modifikasyon işlemleri yüzey safsızlıklarını, hemiselüloz ve lignini azaltmıştır. Çalışma kapsamında uygulanan tüm modifikasyon işlemleri jüt ipliklerinin kopma mukavemetini ve modülünü istatistiksel olarak önemli derecede etkilerken, sadece sodyum perborat trihidrat muamelesi lifin nem içeriğini ve nem geri kazanımını önemli derecede azaltmıştır. Lif yüzeyinde modifikasyon işlemleri sonrası çatlakların meydana geldiği ve yüzey pürüzlülüğünün arttığı belirlenmiştir.The objective of this research is to investigate the chemical modification with different surface treatment agents on jute fiber for usability as reinforcement in polymeric composite materials. For this purpose, jute fibers were treated with 0.02% (w/v) aqueous solutions of Potassium Dichromate, Potassium permanganate and sodium perborate trihydrate. The effect of the treatments were assessed by fourier transform infrared spectroscopy (FTIR), tensile testing, determination of moisture content and moisture regain and also morphological observation by scanning electron microscopy (SEM) and fluorescence microscopy. The surface treatments decreased contents of surface impurities, lignin and hemicelluloses as confirmed by FTIR analysis. All of the surface treatments influenced the tensile strength and elasticity modulus of the jute yarns significantly whereas only sodium perborate trihydrate treatment decreased moisture related properties significantly. SEM micrographs showed that modification processes caused cracks and roughness on the surface of the jute fibers
Mostafa Rezaeian - One of the best experts on this subject based on the ideXlab platform.
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Intestinal Protozoa in Domestic Cats (Carnivora: Felidae, Felis catus) in Northwestern Iran: A Cross-Sectional Study with Prevalent of Microsporidian and Coccidian Parasites
Tehran University of Medical Sciences, 2019Co-Authors: Mehdi Mohebali, Khadijeh Khanaliha, Fatemeh Tarighi, Zabiholah Zarei, Eshrat Beigom Kia, Afsaneh Motavalli-haghi, Jaber Davoodi, Mahya Khodabakhsh, Mostafa RezaeianAbstract:Background: In this study, some microsporidial and coccidian parasites were isolated from 103 domestic cats in the Meshkin Shahr area, northwestern Iran during the Jun 2014 to Jun 2015, and their genera were identified using parasitological methods with emphasis on their zoonotic importance. Methods: One hundred and three fecal samples of domestic cats were collected and preserved in formalin (10%) and conserved in phosphate buffer saline solution, finally examined by microscopy after formalin-ether concentration and specific staining. Preservation in Dichromate Potassium (2.5%) was performed for all coccidian positive samples and then sporulated coccidian oocysts were investigated. Results: The detected parasites were Isospora spp. 6/103(5.8%). Microsporidian spores were identified in 46/103 (44.6%) of all samples post-stained by the aniline blue staining method. Conclusion: Microsporidial infections were more prevalent in domestic cats. Further studies are needed in the identification of microsporidial spores isolated from infected cats
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Natural Intestinal Protozoa in Rodents (Rodentia: Gerbillinae, Murinae, Cricetinae) in Northwestern Iran
Tehran University of Medical Sciences, 2017Co-Authors: Mehdi Mohebali, Khadijeh Khanaliha, Fatemeh Tarighi, Tahereh Rezaeian, Zabiholah Zarei, Eshrat Beigom Kia, Afsaneh Motavalli-haghi, Jaber Davoodi, Mostafa RezaeianAbstract:Background: Majority of parasitic infections in rodents have zoonotic importance. This study aimed to determine the frequency and intensity of intestinal protozoa infections of rodents including Meriones persicus, Mus musculus and, Cricetulus migratorius.Methods: This survey was conducted in Meshkin Shahr district in northwestern Iran from Mar. to Dec. of 2014. Intestinal samples of 204 rodents including M. persicus (n=117), M. musculus (n=63) and C. migratorius (n=24) were parasitologically examined. Formalin-ether concentration method was done for all of rodents stool samples and observed with light microscope. All of suspected cases were stained with trichorome staining Method. Cultivation in Dichromate Potassium 2.5% was carried out for all of coccidian positive samples. Acid fast and aniline blue staining methods were used for detecting of coccidian oocysts and intestinal microsporidial spores, respectively.Results: About 121(59.3%) of the caught rodents were generally infected with intestinal protozoa. Entamoeba muris 14(6.9%), Trichomonas muris 55(27.0%), Chilomastix betencourtti 17 (8.3%), Giardia muris 19(9.3%), Eimeria spp. 46(22.5%), Isospora spp. 4(2%) and Cryptosporidium spp. 1(0.5%) were found from the collected rodents. Microsporidian spores were identified in 63 (31%) out of the 204 collected rodents using aniline blue staining method.Conclusion: Since some of the infections are zoonotic importance thus, control of rodents can be decreased new cases of the parasitic zoonoses in humans
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detection of emergence cyclospora cayetanensis in a hiv aids patient with diarrhea from tehran a case report
Iranian Journal of Public Health, 2015Co-Authors: Khadijeh Khanaliha, Mehdi Mohebali, Setareh Davoudi, Omid Reza Hosseini, Fatemeh Tarighi, Tahereh Rezaeian, Mostafa RezaeianAbstract:Coccidian protozoa of Cyclospora cayetanensis are obligate intracellular apicomplexan parasites that infect the mucosal epithelium of the small intestine of immunocompetent and immunocompromised persons. A 25- years old woman from around, Tehran with complaint of faintness and fatigue with HIV positive/AIDS confirmed eight months ago was admitted in Imam Khomeini Hospital, Tehran, Iran in 2014. The patient suffered from intestinal and lung symptoms like watery diarrhea, flu-like symptoms. The stool was examined by direct preparation and concentration technique, stained with modified acid-fast staining method, and observed with light and then Immunofluorescence microscope. The stool cultivation was made in Dichromate Potassium medium and diagnosis of Cyclospora infection was finally made according to observation of Cyclospora oocysts almost 10 μm in acid-fast staining method and autofluorescence of Cyclospora under Immunofluorescence microscope. The patient was initially treated with azithromycin, tazocin and fluconazol because of lung lesions and diarrhea and relative remission was observed. Cyclospora sp. causes an intestinal infection particularly in immunocompromised patients.
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Detection of Emergence Cyclospora cayetanensis in A HIV(+) / AIDS Patient with Diarrhea from Tehran: A Case Report.
Iranian journal of public health, 2015Co-Authors: Khadijeh Khanaliha, Mehdi Mohebali, Setareh Davoudi, Omid Reza Hosseini, Fatemeh Tarighi, Tahereh Rezaeian, Mostafa RezaeianAbstract:Coccidian protozoa of Cyclospora cayetanensis are obligate intracellular apicomplexan parasites that infect the mucosal epithelium of the small intestine of immunocompetent and immunocompromised persons. A 25- years old woman from around, Tehran with complaint of faintness and fatigue with HIV positive/AIDS confirmed eight months ago was admitted in Imam Khomeini Hospital, Tehran, Iran in 2014. The patient suffered from intestinal and lung symptoms like watery diarrhea, flu-like symptoms. The stool was examined by direct preparation and concentration technique, stained with modified acid-fast staining method, and observed with light and then Immunofluorescence microscope. The stool cultivation was made in Dichromate Potassium medium and diagnosis of Cyclospora infection was finally made according to observation of Cyclospora oocysts almost 10 μm in acid-fast staining method and autofluorescence of Cyclospora under Immunofluorescence microscope. The patient was initially treated with azithromycin, tazocin and fluconazol because of lung lesions and diarrhea and relative remission was observed. Cyclospora sp. causes an intestinal infection particularly in immunocompromised patients.
Narsi R. Bishnoi - One of the best experts on this subject based on the ideXlab platform.
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Performance of buffered ferric chloride as terminal electron acceptor in dual chamber microbial fuel cell
Journal of Environmental Chemical Engineering, 2017Co-Authors: Smita S. Kumar, Sandeep K. Malyan, Narsi R. BishnoiAbstract:Abstract Electrochemical behaviour of buffered ferric chloride (FC) was studied as terminal electron acceptor (TEA) in a dual chamber microbial fuel cell (DCMFC). The DCMFC was operated in batch mode using lactate as substrate and enriched consortium of sulphate reducing and sulphur oxidising bacteria as anodic biocatalysts. To characterise the TEA in terms of open circuit voltage and power density, four DCMFCs were operated individually under similar anodic operating conditions with phosphate buffer (PB), Potassium hexacyanoferrate (PF), Potassium Dichromate (PD) and FC. Results showed that voltage and power generation with FC were highest among the four TEAs. Performance of the four tested buffered catholytes was found to be in the following order: ferric chloride (857 mV; 308.7 mW/m 2 ) > Potassium hexacyanoferrate (571 mV; 222 mW/m 2 ) > Potassium Dichromate (517 mV; 168.6 mW/m 2 ) > phosphate buffer solution (250 mV; 16.87 mW/m 2 ). With the addition of Potassium Dichromate, Potassium hexacyanoferrate and ferric chloride to phosphate buffer, charge transfer resistance (R ct ) declined by 67%, 52.2% and 51.8%, respectively. Ohmic resistance decreased by 36%, 41.6% and 37.6%, respectively. Electrical conductivity of the leachate after coagulation with ferric chloride increased from an initial of 2.54–7.96 mS thus further supporting the decreased resistance. Further, with no optimization, 50 mM/L of ferric chloride could remove 68.3% of COD having initial value of 9600 mg/L in the cathode chamber.
Seki Yasemin - One of the best experts on this subject based on the ideXlab platform.
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Farklı Kim-yasal Maddeler İle Modifiye Edilen Jüt Liflerinin Mekanik Ve Morfolojik Özelliklerinin İncelenmesi
Teorik ve Uygulamalı Mekanik Türk Milli Komitesi, 2017Co-Authors: Seki Yasemin, Akşit AysunAbstract:Bu calışmada, polimerik kompozit malzemelerde takviye elemanı olarak kullanılan jüt liflerinin farklı kimyasal maddeler ile yüzey modifikasyonu incelenmiştir. Bu amaçla, jüt iplikleri potasyum dikromat, potasyum permanganat ve sodyum perborat trihidratın %0,02'lik sulu çözeltileri ile muamele edilmiştir. Modifikasyon işlemlerinin etkinliği kızılötesi infrared spektrumu (FTIR) analizi, mukavemet testi ve lifin nem içeriği ve nem geri kazanımı performansının belirlenmesi ile değerlendirilmiştir. Ayrıca taramalı elektron mikroskobu (SEM) ve fluoresans mikroskop ile yüzey morfolojik özellikleri de incelenmiştir. FTIR analizi sonuçlarına göre yüzey modifikasyon işlemleri yüzey safsızlıklarını, hemiselüloz ve lignini azaltmıştır. Çalışma kapsamında uygulanan tüm modifikasyon işlemleri jüt ipliklerinin kopma mukavemetini ve modülünü istatistiksel olarak önemli derecede etkilerken, sadece sodyum perborat trihidrat muamelesi lifin nem içeriğini ve nem geri kazanımını önemli derecede azaltmıştır. Lif yüzeyinde modifikasyon işlemleri sonrası çatlakların meydana geldiği ve yüzey pürüzlülüğünün arttığı belirlenmiştir.The objective of this research is to investigate the chemical modification with different surface treatment agents on jute fiber for usability as reinforcement in polymeric composite materials. For this purpose, jute fibers were treated with 0.02% (w/v) aqueous solutions of Potassium Dichromate, Potassium permanganate and sodium perborate trihydrate. The effect of the treatments were assessed by fourier transform infrared spectroscopy (FTIR), tensile testing, determination of moisture content and moisture regain and also morphological observation by scanning electron microscopy (SEM) and fluorescence microscopy. The surface treatments decreased contents of surface impurities, lignin and hemicelluloses as confirmed by FTIR analysis. All of the surface treatments influenced the tensile strength and elasticity modulus of the jute yarns significantly whereas only sodium perborate trihydrate treatment decreased moisture related properties significantly. SEM micrographs showed that modification processes caused cracks and roughness on the surface of the jute fibers
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Farklı Kim-yasal Maddeler İle Modifiye Edilen Jüt Liflerinin Mekanik Ve Morfolojik Özelliklerinin İncelenmesi
Theoretical and Applied Mechanical Turkish National Committee, 2015Co-Authors: Seki Yasemin, Akşit AysunAbstract:Konferans Bildirisi -- Teorik ve Uygulamalı Mekanik Türk Milli Komitesi, 2015Conference Paper -- Theoretical and Applied Mechanical Turkish National Committee, 2015Bu calışmada, polimerik kompozit malzemelerde takviye elemanı olarak kullanılan jüt liflerinin farklı kimyasal maddeler ile yüzey modifikasyonu incelenmiştir. Bu amaçla, jüt iplikleri potasyum dikromat, potasyum permanganat ve sodyum perborat trihidratın %0,02'lik sulu çözeltileri ile muamele edilmiştir. Modifikasyon işlemlerinin etkinliği kızılötesi infrared spektrumu (FTIR) analizi, mukavemet testi ve lifin nem içeriği ve nem geri kazanımı performansının belirlenmesi ile değerlendirilmiştir. Ayrıca taramalı elektron mikroskobu (SEM) ve fluoresans mikroskop ile yüzey morfolojik özellikleri de incelenmiştir. FTIR analizi sonuçlarına göre yüzey modifikasyon işlemleri yüzey safsızlıklarını, hemiselüloz ve lignini azaltmıştır. Çalışma kapsamında uygulanan tüm modifikasyon işlemleri jüt ipliklerinin kopma mukavemetini ve modülünü istatistiksel olarak önemli derecede etkilerken, sadece sodyum perborat trihidrat muamelesi lifin nem içeriğini ve nem geri kazanımını önemli derecede azaltmıştır. Lif yüzeyinde modifikasyon işlemleri sonrası çatlakların meydana geldiği ve yüzey pürüzlülüğünün arttığı belirlenmiştir.The objective of this research is to investigate the chemical modification with different surface treatment agents on jute fiber for usability as reinforcement in polymeric composite materials. For this purpose, jute fibers were treated with 0.02% (w/v) aqueous solutions of Potassium Dichromate, Potassium permanganate and sodium perborate trihydrate. The effect of the treatments were assessed by fourier transform infrared spectroscopy (FTIR), tensile testing, determination of moisture content and moisture regain and also morphological observation by scanning electron microscopy (SEM) and fluorescence microscopy. The surface treatments decreased contents of surface impurities, lignin and hemicelluloses as confirmed by FTIR analysis. All of the surface treatments influenced the tensile strength and elasticity modulus of the jute yarns significantly whereas only sodium perborate trihydrate treatment decreased moisture related properties significantly. SEM micrographs showed that modification processes caused cracks and roughness on the surface of the jute fibers
Smita S. Kumar - One of the best experts on this subject based on the ideXlab platform.
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Performance of buffered ferric chloride as terminal electron acceptor in dual chamber microbial fuel cell
Journal of Environmental Chemical Engineering, 2017Co-Authors: Smita S. Kumar, Sandeep K. Malyan, Narsi R. BishnoiAbstract:Abstract Electrochemical behaviour of buffered ferric chloride (FC) was studied as terminal electron acceptor (TEA) in a dual chamber microbial fuel cell (DCMFC). The DCMFC was operated in batch mode using lactate as substrate and enriched consortium of sulphate reducing and sulphur oxidising bacteria as anodic biocatalysts. To characterise the TEA in terms of open circuit voltage and power density, four DCMFCs were operated individually under similar anodic operating conditions with phosphate buffer (PB), Potassium hexacyanoferrate (PF), Potassium Dichromate (PD) and FC. Results showed that voltage and power generation with FC were highest among the four TEAs. Performance of the four tested buffered catholytes was found to be in the following order: ferric chloride (857 mV; 308.7 mW/m 2 ) > Potassium hexacyanoferrate (571 mV; 222 mW/m 2 ) > Potassium Dichromate (517 mV; 168.6 mW/m 2 ) > phosphate buffer solution (250 mV; 16.87 mW/m 2 ). With the addition of Potassium Dichromate, Potassium hexacyanoferrate and ferric chloride to phosphate buffer, charge transfer resistance (R ct ) declined by 67%, 52.2% and 51.8%, respectively. Ohmic resistance decreased by 36%, 41.6% and 37.6%, respectively. Electrical conductivity of the leachate after coagulation with ferric chloride increased from an initial of 2.54–7.96 mS thus further supporting the decreased resistance. Further, with no optimization, 50 mM/L of ferric chloride could remove 68.3% of COD having initial value of 9600 mg/L in the cathode chamber.