Pub Date : 2016-12-30DOI: 10.7439/IJASR.V2I12.3814
Shalini Singh
In 1924, A. Friedmann and J. A. Schoten [1] introduced the idea of a semi-symmetric linear connection in a differentiable manifold. Hayden [2] has introduced the idea of metric connection with torsion in a Riemannian manifold. The properties of semi-symmetric metric connection in a Riemannian manifold have been studied by Yano [3] and others [4], [5]. The purpose of the present paper is to study some properties of semi-symmetric metric connection on an integrated contact metric structure manifold [6], several useful algebraic and geometrical properties have been studied.
1924年，a . Friedmann和J. a . Schoten[1]引入了可微流形中半对称线性连接的思想。Hayden[2]在黎曼流形中引入了度量与扭转的联系。Yano[3]等人[4]，[5]研究了黎曼流形中半对称度量连接的性质。本文的目的是研究集成接触度量结构流形上的半对称度量连接的一些性质[6]，研究了一些有用的代数和几何性质。
{"title":"A semi-symmetric metric connection on an integrated contact metric structure manifold","authors":"Shalini Singh","doi":"10.7439/IJASR.V2I12.3814","DOIUrl":"https://doi.org/10.7439/IJASR.V2I12.3814","url":null,"abstract":"In 1924, A. Friedmann and J. A. Schoten [1] introduced the idea of a semi-symmetric linear connection in a differentiable manifold. Hayden [2] has introduced the idea of metric connection with torsion in a Riemannian manifold. The properties of semi-symmetric metric connection in a Riemannian manifold have been studied by Yano [3] and others [4], [5]. The purpose of the present paper is to study some properties of semi-symmetric metric connection on an integrated contact metric structure manifold [6], several useful algebraic and geometrical properties have been studied.","PeriodicalId":119953,"journal":{"name":"International Journal of Advances in Scientific Research","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131827782","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 : 2016-12-30DOI: 10.7439/IJASR.V2I11.3716
N. Chavada, K. Deshmukh
Plankton refers to plants and animals that drift with the ocean currents and fresh river water .they habitants in the open waters of the sea and fresh river water. Phytoplankton always live near the surface of the sea and fresh water because, they require light for photosynthesis, they play important roll in transformation of water and carbon dioxide in to short chain sugars. The plants in the pelagic zone are exceptionally small, microscopic, and single-celled, buoyantly supported by the density of the surrounding water. Physico-chemical parameters are very important factors that play a significant role in river plankton diversity and fluctuation. We evaluated impact of Abiotic factor on plankton diversity during pre, middle and post winter analysis of Hemmat River.
{"title":"Evaluation of phytoplankton diversity with Physicochemical parameters of Hemmat River, kodinar Gujarat, India","authors":"N. Chavada, K. Deshmukh","doi":"10.7439/IJASR.V2I11.3716","DOIUrl":"https://doi.org/10.7439/IJASR.V2I11.3716","url":null,"abstract":"Plankton refers to plants and animals that drift with the ocean currents and fresh river water .they habitants in the open waters of the sea and fresh river water. Phytoplankton always live near the surface of the sea and fresh water because, they require light for photosynthesis, they play important roll in transformation of water and carbon dioxide in to short chain sugars. The plants in the pelagic zone are exceptionally small, microscopic, and single-celled, buoyantly supported by the density of the surrounding water. Physico-chemical parameters are very important factors that play a significant role in river plankton diversity and fluctuation. We evaluated impact of Abiotic factor on plankton diversity during pre, middle and post winter analysis of Hemmat River.","PeriodicalId":119953,"journal":{"name":"International Journal of Advances in Scientific Research","volume":"47 11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134087885","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}
Cristiano José de Andrade, A. P. R. Simiqueli, L. M. Andrade, A. Mendes, P. Jauregi, G. Pastore
The market price of glycerol worldwide tends to decrease, since it is a by-product of biodiesel production. Thus its biotechnological use might lead to significant reduction in the cost of fermentations. The aim of this study was to compare the production of surfactin in peptone culture media supplemented with analytical grade glycerol (AGG) and concentrated glycerol from biodiesel production (CGBP). Differences were observed between the two processes including cell growth and dissolved oxygen consumption. Surfactin yield was 325.19 mg/L with AGG and 71.13 mg/L with CGBP, which proves the impact and importance of the purity of glycerol on the yield of surfactin. In addition, five surfactin homologous were identified by ESI-Q-TOFMS, which were composed by two amino acid sequences ELLMDLD and ELLLDLL. Therefore, as surfactin is a high value-added product, the use of glycerol with high purity is fundamental to achieve higher productivity.
{"title":"Comparative study: bench-scale surfactin production from bacillus subtilis using analytical grade and concentrated glycerol from the biodiesel industry","authors":"Cristiano José de Andrade, A. P. R. Simiqueli, L. M. Andrade, A. Mendes, P. Jauregi, G. Pastore","doi":"10.14419/IJSW.V5I1.6965","DOIUrl":"https://doi.org/10.14419/IJSW.V5I1.6965","url":null,"abstract":"The market price of glycerol worldwide tends to decrease, since it is a by-product of biodiesel production. Thus its biotechnological use might lead to significant reduction in the cost of fermentations. The aim of this study was to compare the production of surfactin in peptone culture media supplemented with analytical grade glycerol (AGG) and concentrated glycerol from biodiesel production (CGBP). Differences were observed between the two processes including cell growth and dissolved oxygen consumption. Surfactin yield was 325.19 mg/L with AGG and 71.13 mg/L with CGBP, which proves the impact and importance of the purity of glycerol on the yield of surfactin. In addition, five surfactin homologous were identified by ESI-Q-TOFMS, which were composed by two amino acid sequences ELLMDLD and ELLLDLL. Therefore, as surfactin is a high value-added product, the use of glycerol with high purity is fundamental to achieve higher productivity.","PeriodicalId":119953,"journal":{"name":"International Journal of Advances in Scientific Research","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115713941","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}
Several plants are utilized for medicinal and nutritional purposes. Irvingia gabonensis O’Rorke Baill leaf is used in herbal medicine for treatment of a number of ailments. This study was therefore carried out to investigate the proximate composition, antinutritional factors, mineral composition and amino acid profile of Irvingia gabonensis O’Rorke Baill leaf. The proximate and antinutritional factors analyses were done using standard procedures. The mineral analyses were done using flame photometry, titrimetic method, molybdo vanadate method and atomic absorption spectrophotometry and the amino acid profile was done with the aid of Applied Biosystems PTH amino acid analyzer. Results of proximate analyses were carbohydrates (75.15±1.29 %), protein (11.43±1.07 %), fat (1.99±0.74 %), fibre (4.89±0.61 %), ash (6.71±0.28 %), moisture (5.12±0.03 %) and caloric value (364.30±5.95 Kcal). Antinutrients (phytate, oxalate and cyanide) levels in the leaf were also very low. Results from mineral analyses obtained revealed that the leaf is also a very rich source of calcium, potassium, sodium, magnesium and so on. Compared with the World health organization (WHO) standards, results of the amino acid profile showed that the leaf is very rich in isoleucine, leucine, lysine, phenylalanine, threonine, valine and tyrosine which are nutritionally essential amino acids. Furthermore, extraction of the leaf using ethanol reduced the levels of these amino acids but not below the recommended WHO standard levels for most of the essential amino acids. Irvingia gabonensis O’Rorke Baill leaf is therefore a potential source of key nutrients.
{"title":"Proximate composition, mineral content and amino acid profile of Irvingia gabonensis O’Rorke baill leaf","authors":"E. Ewere, O. E. Etim, Usunomena Usunobun","doi":"10.14419/IJSW.V5I1.6969","DOIUrl":"https://doi.org/10.14419/IJSW.V5I1.6969","url":null,"abstract":"Several plants are utilized for medicinal and nutritional purposes. Irvingia gabonensis O’Rorke Baill leaf is used in herbal medicine for treatment of a number of ailments. This study was therefore carried out to investigate the proximate composition, antinutritional factors, mineral composition and amino acid profile of Irvingia gabonensis O’Rorke Baill leaf. The proximate and antinutritional factors analyses were done using standard procedures. The mineral analyses were done using flame photometry, titrimetic method, molybdo vanadate method and atomic absorption spectrophotometry and the amino acid profile was done with the aid of Applied Biosystems PTH amino acid analyzer. Results of proximate analyses were carbohydrates (75.15±1.29 %), protein (11.43±1.07 %), fat (1.99±0.74 %), fibre (4.89±0.61 %), ash (6.71±0.28 %), moisture (5.12±0.03 %) and caloric value (364.30±5.95 Kcal). Antinutrients (phytate, oxalate and cyanide) levels in the leaf were also very low. Results from mineral analyses obtained revealed that the leaf is also a very rich source of calcium, potassium, sodium, magnesium and so on. Compared with the World health organization (WHO) standards, results of the amino acid profile showed that the leaf is very rich in isoleucine, leucine, lysine, phenylalanine, threonine, valine and tyrosine which are nutritionally essential amino acids. Furthermore, extraction of the leaf using ethanol reduced the levels of these amino acids but not below the recommended WHO standard levels for most of the essential amino acids. Irvingia gabonensis O’Rorke Baill leaf is therefore a potential source of key nutrients.","PeriodicalId":119953,"journal":{"name":"International Journal of Advances in Scientific Research","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131084406","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}
Free living nitrogen fixing bacteria were isolated from soil on Jensen agar plates and were characterized phylogenetically by 16S rDNA sequence analysis. All the isolates (VS1, VS2, VS3, VS4) were Gram –ve, rod shaped. Antibiotic test revealed VS2 to be resistant to ampicillin and VS4 was resistant to both ampicillin and kanamycin; otherwise all the isolates were sensitive to chloramphenicol. Nitrogen fixation was studied by the estimation of total nitrogen and available nitrogen fixed by cultures in the medium and compared with the control culture of Azotobacter CBD15 (Azo) procured from IARI. VS2 and VS3 fixed 12.02 ppm/ml and 10.635 ppm/ml as available nitrogen content and 14.44 ppm/ml and 18.73 ppm/ml as total nitrogen content. 16S rDNA studies revealed identification of the isolates- Pseudomonas sp. (VS2) and Paenibacillus sp. (VS3 and VS4). VS3 and VS4 showed 98% similarity with P. borealis . Soils from which these microbes isolated were also characterized to understand the environment of these microbes. The pH and chemical characterization (Organic Carbon, Phosphorus, Sulphur, heavy metal analysis of different metals e.g. Zn, Cu, Cr, Pb, Ni and water holding capacity) of the soils showed them to be slightly alkaline and clayey loamy. Cloning of VS2 was done successfully with plasmid pMMB277 isolated from E. coli 2842.The significance of this study lies in the isolation of those bacteria which are comparable in their nitrogen fixing potential to Azotobacter .
{"title":"Isolation and characterization of free-living nitrogen fixing bacteria from alkaline soils","authors":"M. Smita, D. Goyal","doi":"10.14419/IJSW.V5I1.6936","DOIUrl":"https://doi.org/10.14419/IJSW.V5I1.6936","url":null,"abstract":"Free living nitrogen fixing bacteria were isolated from soil on Jensen agar plates and were characterized phylogenetically by 16S rDNA sequence analysis. All the isolates (VS1, VS2, VS3, VS4) were Gram –ve, rod shaped. Antibiotic test revealed VS2 to be resistant to ampicillin and VS4 was resistant to both ampicillin and kanamycin; otherwise all the isolates were sensitive to chloramphenicol. Nitrogen fixation was studied by the estimation of total nitrogen and available nitrogen fixed by cultures in the medium and compared with the control culture of Azotobacter CBD15 (Azo) procured from IARI. VS2 and VS3 fixed 12.02 ppm/ml and 10.635 ppm/ml as available nitrogen content and 14.44 ppm/ml and 18.73 ppm/ml as total nitrogen content. 16S rDNA studies revealed identification of the isolates- Pseudomonas sp. (VS2) and Paenibacillus sp. (VS3 and VS4). VS3 and VS4 showed 98% similarity with P. borealis . Soils from which these microbes isolated were also characterized to understand the environment of these microbes. The pH and chemical characterization (Organic Carbon, Phosphorus, Sulphur, heavy metal analysis of different metals e.g. Zn, Cu, Cr, Pb, Ni and water holding capacity) of the soils showed them to be slightly alkaline and clayey loamy. Cloning of VS2 was done successfully with plasmid pMMB277 isolated from E. coli 2842.The significance of this study lies in the isolation of those bacteria which are comparable in their nitrogen fixing potential to Azotobacter .","PeriodicalId":119953,"journal":{"name":"International Journal of Advances in Scientific Research","volume":"144 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129436358","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}
Our each and every part of life is persuaded by diversity of factors. Social and economic factors have a huge impact on person’s health. The purpose of this study is to investigate the social and economic determinants of diseases by a statistical technique called factor analysis using SPSS version 21. Sample of 1500 male and female patients from public and private hospitals of Southern Punjab, Pakistan is utilized using saturation sampling technique. Results illustrate that gender, age, area living, migration of ancestors, gender of house hold head, respondent’s and parent’s educational level, marital status, family size and monthly income are the major social and economic determinants of diseases. Age is the major factor that affects a person’s health. As age increase the chances of getting affected by disease also increase. So we can say that age and probability of getting ill are directly proportional to each other. Same is the case with income and education. Males are found to get ill more often, relatively compared to females.
{"title":"Factor analysis of socio-economic determinants of diseases","authors":"S. Khanum, Bi Ansari, Anila Hussain, Huma Qasim","doi":"10.14419/IJSW.V5I1.6611","DOIUrl":"https://doi.org/10.14419/IJSW.V5I1.6611","url":null,"abstract":"Our each and every part of life is persuaded by diversity of factors. Social and economic factors have a huge impact on person’s health. The purpose of this study is to investigate the social and economic determinants of diseases by a statistical technique called factor analysis using SPSS version 21. Sample of 1500 male and female patients from public and private hospitals of Southern Punjab, Pakistan is utilized using saturation sampling technique. Results illustrate that gender, age, area living, migration of ancestors, gender of house hold head, respondent’s and parent’s educational level, marital status, family size and monthly income are the major social and economic determinants of diseases. Age is the major factor that affects a person’s health. As age increase the chances of getting affected by disease also increase. So we can say that age and probability of getting ill are directly proportional to each other. Same is the case with income and education. Males are found to get ill more often, relatively compared to females.","PeriodicalId":119953,"journal":{"name":"International Journal of Advances in Scientific Research","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122420365","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}
The sound velocities and some thermal properties of BeX (X=S, Se and Te) beryllium-chalcogenides large band gaps semiconductors have been estimated by employing some usual theoretical and emperical formulas. The lattice parameters and the elastic stiffness constants used here are taken from the literature. The longitudinal, transverse and average elastic wave velocities, the Debye temperature, the melting temperature, the thermal conductivity and the Gruneisen parameter are successfully predicted and analyzed in comparison with the available experimental and theoretical data. In general, our obtained results of these quantities agree well with the experimental and other theoretical data of the literature.
{"title":"Sound velocities and thermal properties of BeX (X=S, Se and Te) alkaline-earth chalcogenides","authors":"S. Daoud","doi":"10.14419/ijsw.v5i1.6929","DOIUrl":"https://doi.org/10.14419/ijsw.v5i1.6929","url":null,"abstract":"The sound velocities and some thermal properties of BeX (X=S, Se and Te) beryllium-chalcogenides large band gaps semiconductors have been estimated by employing some usual theoretical and emperical formulas. The lattice parameters and the elastic stiffness constants used here are taken from the literature. The longitudinal, transverse and average elastic wave velocities, the Debye temperature, the melting temperature, the thermal conductivity and the Gruneisen parameter are successfully predicted and analyzed in comparison with the available experimental and theoretical data. In general, our obtained results of these quantities agree well with the experimental and other theoretical data of the literature.","PeriodicalId":119953,"journal":{"name":"International Journal of Advances in Scientific Research","volume":"11 43","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114044348","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}
The quest for cheap and quality food is on the increase, especially during economy crises. Some nutritional properties of the raw and cooked local and industrial spaghetti were determined using standard methods. Concentrations of mineral elements were determined using atomic absorption spectrophotometer. Total ash (0.98±007 %), crude protein (14.28±0.15 %) and carbohydrate (77.95±0.11 %) levels in the raw industrial spaghetti were higher compared to the locally processed raw spaghetti. Carbohydrate and moisture levels for both processed spaghetti increased on cooking, while total ash and protein contents decreased. Crude fiber (0.009±0.00 %), carbohydrate (77.52±0.21 %) and moisture levels in the cooked local spaghetti were higher than in the cooked industrial spaghetti. Proximate contents of the local and industrial raw spaghetti were significantly ( P ≤ 0.05) different. Concentrations of mineral elements in the raw locally processed spaghetti were lower than in the industrial spaghetti. Low levels of functional properties were recorded in the local spaghetti. Cooking decreased zinc content in the spaghetti, but significantly ( P ≤ 0.05) increased the moisture content, crude fiber, carbohydrate and mineral contents. The spaghetti processed locally may serve as an alternative to the industrial spaghetti.
{"title":"Nutritional qualities assessment of locally processed spaghetti","authors":"B. Tukura, J. Gbubele, S. Mamman","doi":"10.14419/IJSW.V5I1.6900","DOIUrl":"https://doi.org/10.14419/IJSW.V5I1.6900","url":null,"abstract":"The quest for cheap and quality food is on the increase, especially during economy crises. Some nutritional properties of the raw and cooked local and industrial spaghetti were determined using standard methods. Concentrations of mineral elements were determined using atomic absorption spectrophotometer. Total ash (0.98±007 %), crude protein (14.28±0.15 %) and carbohydrate (77.95±0.11 %) levels in the raw industrial spaghetti were higher compared to the locally processed raw spaghetti. Carbohydrate and moisture levels for both processed spaghetti increased on cooking, while total ash and protein contents decreased. Crude fiber (0.009±0.00 %), carbohydrate (77.52±0.21 %) and moisture levels in the cooked local spaghetti were higher than in the cooked industrial spaghetti. Proximate contents of the local and industrial raw spaghetti were significantly ( P ≤ 0.05) different. Concentrations of mineral elements in the raw locally processed spaghetti were lower than in the industrial spaghetti. Low levels of functional properties were recorded in the local spaghetti. Cooking decreased zinc content in the spaghetti, but significantly ( P ≤ 0.05) increased the moisture content, crude fiber, carbohydrate and mineral contents. The spaghetti processed locally may serve as an alternative to the industrial spaghetti.","PeriodicalId":119953,"journal":{"name":"International Journal of Advances in Scientific Research","volume":"113 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114366503","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 : 2016-11-30DOI: 10.7439/IJASR.V2I11.3696
A. Ameen
Air monitoring is important to check the quality of air effected by the industry. The Lahore compost Pvt Ltd is a part of saif group of companies. The LCL utilize tons of municipal solid waste to make organic bio fertilizer. Almost 8,000 tons of organic waste is transported to the landfill site. This study was designed to check the effect of composting plant on nearby village of Mahmood Booti. The parameters for air monitoring were PM 10, CO and TSP. The results were satisfactory and below the baseline. The results are according to the standards provided by WHO for air quality.
{"title":"Evaluation of ambient Air quality of nearby village effected by LCL composting plant","authors":"A. Ameen","doi":"10.7439/IJASR.V2I11.3696","DOIUrl":"https://doi.org/10.7439/IJASR.V2I11.3696","url":null,"abstract":"Air monitoring is important to check the quality of air effected by the industry. The Lahore compost Pvt Ltd is a part of saif group of companies. The LCL utilize tons of municipal solid waste to make organic bio fertilizer. Almost 8,000 tons of organic waste is transported to the landfill site. This study was designed to check the effect of composting plant on nearby village of Mahmood Booti. The parameters for air monitoring were PM 10, CO and TSP. The results were satisfactory and below the baseline. The results are according to the standards provided by WHO for air quality.","PeriodicalId":119953,"journal":{"name":"International Journal of Advances in Scientific Research","volume":"7 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123225376","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}
Worldwide oil production has been declining. Microbial enhanced oil recovery is one of the most important tertiary recovery processes. The aim of this work was to evaluate the surface activity properties of surfactin and mannosylerithritol lipids-B. In our previous studies, surfactin and mannosylerithritol lipids were produced using cassava wastewater as substrate and then purified by ultrafiltration. Thus, this work extends our previous studies. Experiments of surface activity under extreme conditions (temperature, ionic strength and pH), oil displacement, removal of oil from sand and emulsification index were carried out. Central composite rotational design was performed under extreme conditions of temperature, pH and ionic strength. The results indicated that ionic strength significantly affected the surface activity of surfactin. On the other hand, ionic strength, but also temperature and pH significantly affected the tenso activity of mannosylerithritol lipids-B. Regarding oil displacement test, mannosylerithritol lipids-B showed higher clear zone than surfactin. Contrary, in the experiments of removal of crude oil from sand, minimal differences were observed between surfactin and mannosylerithritol lipids-B. Therefore, both surfactin and mannosylerithritol lipids-B showed good surface activity under extreme conditions. In addition, it seems that mannosylerithritol lipids-B is subtly better than surfactin for microbial enhanced oil recovery.
{"title":"Comparative study on microbial enhanced oil recovery using mannosylerithritol lipids and surfactin","authors":"Cristiano José de Andrade, G. Pastore","doi":"10.14419/IJSW.V4I2.6846","DOIUrl":"https://doi.org/10.14419/IJSW.V4I2.6846","url":null,"abstract":"Worldwide oil production has been declining. Microbial enhanced oil recovery is one of the most important tertiary recovery processes. The aim of this work was to evaluate the surface activity properties of surfactin and mannosylerithritol lipids-B. In our previous studies, surfactin and mannosylerithritol lipids were produced using cassava wastewater as substrate and then purified by ultrafiltration. Thus, this work extends our previous studies. Experiments of surface activity under extreme conditions (temperature, ionic strength and pH), oil displacement, removal of oil from sand and emulsification index were carried out. Central composite rotational design was performed under extreme conditions of temperature, pH and ionic strength. The results indicated that ionic strength significantly affected the surface activity of surfactin. On the other hand, ionic strength, but also temperature and pH significantly affected the tenso activity of mannosylerithritol lipids-B. Regarding oil displacement test, mannosylerithritol lipids-B showed higher clear zone than surfactin. Contrary, in the experiments of removal of crude oil from sand, minimal differences were observed between surfactin and mannosylerithritol lipids-B. Therefore, both surfactin and mannosylerithritol lipids-B showed good surface activity under extreme conditions. In addition, it seems that mannosylerithritol lipids-B is subtly better than surfactin for microbial enhanced oil recovery.","PeriodicalId":119953,"journal":{"name":"International Journal of Advances in Scientific Research","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130679073","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}
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