Megerssa Megerssa Endebu, A. Getahun, Misikire Tessema
Sex-reversal in Oreochromis niloticus is used to produce mono-sex males which are desired in aquaculture for better growth performances and population control. The present study was aimed at studying the effect of elevated fry rearing temperature on survival, sex ratios, and growth performances of O. niloticus populations of Lakes Chamo, Koka, and Ziway. Fries from five separate brood pairs of each population were either treated (T) in elevated fry rearing temperature of 36 ± 1°C or kept at room temperature of 24 ± 1°C as control (C) groups for 10 days (phase-I) and then grown in outdoor ponds for six months (phase-II). Survival rates in T groups (74.0 to 91.7%) were lower than that of C groups (83.3 to 97.0%) in all the three populations in phase-I but not in phase-II. Chamo population was better in survival rate (88.4% and 95.4% in Phase-I, and 95.4% and 95.3% in phase-II) than Koka population (85.8% and 91.3% in Phase-I, and 93.9% and 93.5% in phase-II) and Ziway population (80.2% and 88.6% in Phase-I and 90.2% and 91.9% in phase-II) both in T and C groups respectively. The Chamo population also attained significantly (p<0.05) higher mean final weight of 31.58 ± 6.78 g and 24.26 ± 6.67 g in T and C groups respectively, followed by that of Koka population with 21.70 ± 5.10 g and 18.83 ± 4.16 g while Ziway population with mean final weight of 17.49 ± 4.60 g and 16.81 ± 4.15 g was the least both in T and C groups. The overall sex ratios in T groups were skewed towards male but balanced in all C groups of each population. Better growth was achieved only in T groups with higher male ratio than their corresponding C groups. The number of sensitive brooding pairs and the overall male ratio in T groups were higher in the Koka population (40%, 61.68%) than in Ziway (20%, 56.78%) and Chamo (20%, 56.39%) populations respectively. However, the sensitivity of sex reversal to elevated fry rearing temperature was wide between individuals within each population than across the three populations. Hence, sensitive individuals can be selected from the populations and their degree of sensitivity can be improved through continuous selection of progenies from temperature-sensitive parents.
{"title":"Effect of elevated fry rearing temperature on survival rate, growth performance, and sex ratio of three Oreochromis niloticus populations of Ethiopian Rift Valley Lakes","authors":"Megerssa Megerssa Endebu, A. Getahun, Misikire Tessema","doi":"10.4314/sinet.v45i3.9","DOIUrl":"https://doi.org/10.4314/sinet.v45i3.9","url":null,"abstract":"Sex-reversal in Oreochromis niloticus is used to produce mono-sex males which are desired in aquaculture for better growth performances and population control. The present study was aimed at studying the effect of elevated fry rearing temperature on survival, sex ratios, and growth performances of O. niloticus populations of Lakes Chamo, Koka, and Ziway. Fries from five separate brood pairs of each population were either treated (T) in elevated fry rearing temperature of 36 ± 1°C or kept at room temperature of 24 ± 1°C as control (C) groups for 10 days (phase-I) and then grown in outdoor ponds for six months (phase-II). Survival rates in T groups (74.0 to 91.7%) were lower than that of C groups (83.3 to 97.0%) in all the three populations in phase-I but not in phase-II. Chamo population was better in survival rate (88.4% and 95.4% in Phase-I, and 95.4% and 95.3% in phase-II) than Koka population (85.8% and 91.3% in Phase-I, and 93.9% and 93.5% in phase-II) and Ziway population (80.2% and 88.6% in Phase-I and 90.2% and 91.9% in phase-II) both in T and C groups respectively. The Chamo population also attained significantly (p<0.05) higher mean final weight of 31.58 ± 6.78 g and 24.26 ± 6.67 g in T and C groups respectively, followed by that of Koka population with 21.70 ± 5.10 g and 18.83 ± 4.16 g while Ziway population with mean final weight of 17.49 ± 4.60 g and 16.81 ± 4.15 g was the least both in T and C groups. The overall sex ratios in T groups were skewed towards male but balanced in all C groups of each population. Better growth was achieved only in T groups with higher male ratio than their corresponding C groups. The number of sensitive brooding pairs and the overall male ratio in T groups were higher in the Koka population (40%, 61.68%) than in Ziway (20%, 56.78%) and Chamo (20%, 56.39%) populations respectively. However, the sensitivity of sex reversal to elevated fry rearing temperature was wide between individuals within each population than across the three populations. Hence, sensitive individuals can be selected from the populations and their degree of sensitivity can be improved through continuous selection of progenies from temperature-sensitive parents.","PeriodicalId":275075,"journal":{"name":"SINET: Ethiopian Journal of Science","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124622571","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}
In Ethiopia, obsidian is mainly found in the Afar Depression and the Main Ethiopian Rift. The compositional and petrological features of these obsidians vary. Some volcanic centers show that varying volcanic eruptions from a single center may not necessarily imply variable chemistry. Obsidian has been dated using K/Ar, Ar/Ar, and fission track methods to determine the time of eruption but there are also a few dates on artifacts by hydration dating to establish the time of tool manufacture. Many of the geological sources were utilized by prehistoric populations beginning at least since the Early Stone Age but obsidian became commonly used during the Middle Stone Age. Obsidian based stone tool use for scraping in Ethiopia persisted until recent times.
{"title":"Obsidian in Ethiopia: a Geoarchaeological perspective","authors":"A. Negash","doi":"10.4314/sinet.v45i3.11","DOIUrl":"https://doi.org/10.4314/sinet.v45i3.11","url":null,"abstract":"In Ethiopia, obsidian is mainly found in the Afar Depression and the Main Ethiopian Rift. The compositional and petrological features of these obsidians vary. Some volcanic centers show that varying volcanic eruptions from a single center may not necessarily imply variable chemistry. Obsidian has been dated using K/Ar, Ar/Ar, and fission track methods to determine the time of eruption but there are also a few dates on artifacts by hydration dating to establish the time of tool manufacture. Many of the geological sources were utilized by prehistoric populations beginning at least since the Early Stone Age but obsidian became commonly used during the Middle Stone Age. Obsidian based stone tool use for scraping in Ethiopia persisted until recent times.","PeriodicalId":275075,"journal":{"name":"SINET: Ethiopian Journal of Science","volume":"251 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114562329","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}
Water hyacinth is a free-floating aquatic plant native to the Amazon Basin in South America and the most dangerous and worst aquatic plant in the world including Ethiopia. The objective of the current study was to evaluate water hyacinth found in Lake Ziway for its suitability and safe as animal feed. Suitability of the water hyacinth was determined based on its nutrient content, while safety was determined based on the level of selected heavy metals, and pesticides. Three sites were selected for sampling purposively based on the types of land use and potential sources of water pollution around the Lake. Water hyacinth samples were collected from the selected sites and the level of selected heavy metals, 21 organochlorine, and 14 organophosphate pesticides were analyzed using atomic absorption spectrometry and Gas Chromatography-Mass Spectrometry (gc-ms), respectively. The proximate analysis in the water hyacinth were also determined using the standard method of analysis. The results obtained demonstrate that the level of heavy metals found the ranged from nd to9.0 mg/Kg for cadmium; nd to 30.44 mg/Kg for chromium; 118.1 to 518.8 mg/Kg for manganese; 6.78 to 57 mg/Kg for copper; 34.28 to 884.19 mg/Kg for iron; 2.84 to 37.02 mg/Kg for nickel nd to 21mg/kg for lead and 25.67 to 89.9 mg/Kg for zinc. All pesticides levels were below the limits established by European council regulation for plants used as animal feed which is <0.001mg/Kg. The proximate analysis of the water hyacinthsamples of the leaves parts was moisture content 9.32%, crude protein 18.03%, crude fat 1.42%, crude ash 17.04%, crude fiber 31.04% carbohydrate 22.30%and energy 174 Kcal. The result of the stem revealed the presence of 3.96 moisture content, 2.17% crude protein, 0.47% crude fat, 5.23% crude ash, 6.70% crude fiber, 81.47% carbohydrate, and 338.79 Kca energy. Based on the results of this study, water hyacinth in the Lake Ziway can be potentially used for animal feed.
{"title":"Investigation on Suitability and Safeness of Water hyacinth for Animal Feed, from Lake Ziway","authors":"Kidanu Belete, E. Getu, A. Mekonnen","doi":"10.4314/sinet.v45i3.4","DOIUrl":"https://doi.org/10.4314/sinet.v45i3.4","url":null,"abstract":"Water hyacinth is a free-floating aquatic plant native to the Amazon Basin in South America and the most dangerous and worst aquatic plant in the world including Ethiopia. The objective of the current study was to evaluate water hyacinth found in Lake Ziway for its suitability and safe as animal feed. Suitability of the water hyacinth was determined based on its nutrient content, while safety was determined based on the level of selected heavy metals, and pesticides. Three sites were selected for sampling purposively based on the types of land use and potential sources of water pollution around the Lake. Water hyacinth samples were collected from the selected sites and the level of selected heavy metals, 21 organochlorine, and 14 organophosphate pesticides were analyzed using atomic absorption spectrometry and Gas Chromatography-Mass Spectrometry (gc-ms), respectively. The proximate analysis in the water hyacinth were also determined using the standard method of analysis. The results obtained demonstrate that the level of heavy metals found the ranged from nd to9.0 mg/Kg for cadmium; nd to 30.44 mg/Kg for chromium; 118.1 to 518.8 mg/Kg for manganese; 6.78 to 57 mg/Kg for copper; 34.28 to 884.19 mg/Kg for iron; 2.84 to 37.02 mg/Kg for nickel nd to 21mg/kg for lead and 25.67 to 89.9 mg/Kg for zinc. All pesticides levels were below the limits established by European council regulation for plants used as animal feed which is <0.001mg/Kg. The proximate analysis of the water hyacinthsamples of the leaves parts was moisture content 9.32%, crude protein 18.03%, crude fat 1.42%, crude ash 17.04%, crude fiber 31.04% carbohydrate 22.30%and energy 174 Kcal. The result of the stem revealed the presence of 3.96 moisture content, 2.17% crude protein, 0.47% crude fat, 5.23% crude ash, 6.70% crude fiber, 81.47% carbohydrate, and 338.79 Kca energy. Based on the results of this study, water hyacinth in the Lake Ziway can be potentially used for animal feed.","PeriodicalId":275075,"journal":{"name":"SINET: Ethiopian Journal of Science","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117303822","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}
African white-backed vultures (Gyps africanus) are critically endangered bird species which are commonly found in areas where rubbish food sources and roosting and/or nesting sites are available. This study assessed the population size and threats of the African white-backed vultures in Wolkite town abattoir and the surrounding dumping site from April 2019 to March 2021. A total count method was employed to assess the population size of the species and analyzed using descriptive statistics. A questionnaire consisting semi-structured open-ended questions was used to study the attitude and perception of the local community. During the study period, 192 field visits were conducted to count the population size of African white-backed vultures. Individual African white-backed vultures were counted in the abattoir and dumping sites. About 472 individuals (36%) were counted in the dumping site (Mean ± SD: 20±7.4; Range: 8-29) and 839 individuals (64%) were counted in the abattoir (Mean ± SD: 34±8; Range: 22-47). The age category in the dumping site constituted 269 adults and 203 sub-adults with a statistically significant difference (x2= 8.14, df =1, p< 0.05) between adults and sub-adult age groups. In the abattoir, 319 of the population were adults and 520 were sub-adults, a significant difference (x2= 48.2, df =1, p< 0.05) in the age groups in the area. Threats such as human disturbance and competition for food and roosting with domestic and wild animals were observed during the study period.
{"title":"Population status of the Critically Endangered African White-Backed Vultures (Gyps africanus) in and around Wolkite town, Southwestern Ethiopia","authors":"Beselam Shiferaw, A. Bekele, Bezawork Afework","doi":"10.4314/sinet.v45i3.10","DOIUrl":"https://doi.org/10.4314/sinet.v45i3.10","url":null,"abstract":"African white-backed vultures (Gyps africanus) are critically endangered bird species which are commonly found in areas where rubbish food sources and roosting and/or nesting sites are available. This study assessed the population size and threats of the African white-backed vultures in Wolkite town abattoir and the surrounding dumping site from April 2019 to March 2021. A total count method was employed to assess the population size of the species and analyzed using descriptive statistics. A questionnaire consisting semi-structured open-ended questions was used to study the attitude and perception of the local community. During the study period, 192 field visits were conducted to count the population size of African white-backed vultures. Individual African white-backed vultures were counted in the abattoir and dumping sites. About 472 individuals (36%) were counted in the dumping site (Mean ± SD: 20±7.4; Range: 8-29) and 839 individuals (64%) were counted in the abattoir (Mean ± SD: 34±8; Range: 22-47). The age category in the dumping site constituted 269 adults and 203 sub-adults with a statistically significant difference (x2= 8.14, df =1, p< 0.05) between adults and sub-adult age groups. In the abattoir, 319 of the population were adults and 520 were sub-adults, a significant difference (x2= 48.2, df =1, p< 0.05) in the age groups in the area. Threats such as human disturbance and competition for food and roosting with domestic and wild animals were observed during the study period. ","PeriodicalId":275075,"journal":{"name":"SINET: Ethiopian Journal of Science","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128534306","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}
A. Getahun, Diriba Muleta, F. Assefa, Solomon Kiros, M. Hungria
Microbes are an integral component of the soil ecosystem but degraded soil has few native beneficial microbes. This necessitates the characterization of phytobeneficial bacteria having numerous features. The study was initiated to evaluate rhizobacteria enhancing Acacia (Acacia abyssinica) seed germination. Isolates were selected based primarily on phosphate solubilization activity and other traits hydrogen cyanide (hcn), phytohormone, hydrolytic enzyme, siderophore, ammonia. Among isolates, 45% each was categorized as high and medium phosphate solubilizers and the amount was found to range from 195 to 373 µg/mL. The highest solubilization index (SI) 7 was recorded for Acinetobacter BS-27 and 6 for Pantoea BS-38. The maximum P and iaa were produced by Pseudomonas FB-49 (373 and 659.07µg/mL), respectively. Isolates with multiple traits were chosen for seed germination. Accordingly, Agrobacterium RS-79 and Pseudomonas BS-26 showed 100% activity. A 100% seed germination and vigor index (343.33 and 306.67) were observed in Pseudomonas BS-26 and FB-49. Degraded soil is considered a source for phosphate solubilizing and other beneficial bacteria with many traits to be used for seed germination assay.
{"title":"Phytobeneficial traits of Rhizobacteria isolated from degraded soil and evaluate their effect in augmentation of Acacia (Acacia abyssinica Hochst. Ex Benth) seeds germination","authors":"A. Getahun, Diriba Muleta, F. Assefa, Solomon Kiros, M. Hungria","doi":"10.4314/sinet.v45i3.8","DOIUrl":"https://doi.org/10.4314/sinet.v45i3.8","url":null,"abstract":"Microbes are an integral component of the soil ecosystem but degraded soil has few native beneficial microbes. This necessitates the characterization of phytobeneficial bacteria having numerous features. The study was initiated to evaluate rhizobacteria enhancing Acacia (Acacia abyssinica) seed germination. Isolates were selected based primarily on phosphate solubilization activity and other traits hydrogen cyanide (hcn), phytohormone, hydrolytic enzyme, siderophore, ammonia. Among isolates, 45% each was categorized as high and medium phosphate solubilizers and the amount was found to range from 195 to 373 µg/mL. The highest solubilization index (SI) 7 was recorded for Acinetobacter BS-27 and 6 for Pantoea BS-38. The maximum P and iaa were produced by Pseudomonas FB-49 (373 and 659.07µg/mL), respectively. Isolates with multiple traits were chosen for seed germination. Accordingly, Agrobacterium RS-79 and Pseudomonas BS-26 showed 100% activity. A 100% seed germination and vigor index (343.33 and 306.67) were observed in Pseudomonas BS-26 and FB-49. Degraded soil is considered a source for phosphate solubilizing and other beneficial bacteria with many traits to be used for seed germination assay.","PeriodicalId":275075,"journal":{"name":"SINET: Ethiopian Journal of Science","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134366509","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}
Foodborne illnesses result in life-threatening conditions among vulnerable members of households. Proper knowledge, attitude and practices in food safety issues are important to curb the damage caused by these illnesses at household level. This study examined the food insecurity experiences and food safety knowledge, attitude, and practice (kap) of mothers having outpatient children in Cure Hospital, Addis Ababa, Ethiopia. A sample size of 210 randomly selected mothers was considered for this study. A cross-sectional study was carried out using semi-structured questionnaire to collect data on food insecurity experiences and food safety knowledge, attitude and practice of respondents. Data was analyzed using descriptive statistics. Most respondents were married (68%), had primary or secondary level education (62%), had one or two under-five children (71%), and 52% had monthly income between etb 500 and 2500. Between 70% and 80% of the respondents experienced anxiety or uncertainty of not having enough food for household members or reduced quality or quantity of food they ate in the previous thirty days. Around 58% experienced hunger during the same period. The knowledge of mothers in food safety (food handling, personal hygiene and water sanitation) was generally poor (<60%). The level of positive attitudes of mothers towards food safety was also poor (<60%). Appropriate practices, particularly in food handling and personal hygiene were also very poor. As foodborne illnesses can be fatal to vulnerable members of a household, a thorough training to mothers in food safety issues is recommended.
{"title":"Household food insecurity and food safety knowledge, attitude, and practice of mothers with outpatient under-five children at Cure Hospital, Addis Ababa","authors":"Hiwot Disassa, M. Ashenafi","doi":"10.4314/sinet.v45i3.7","DOIUrl":"https://doi.org/10.4314/sinet.v45i3.7","url":null,"abstract":"Foodborne illnesses result in life-threatening conditions among vulnerable members of households. Proper knowledge, attitude and practices in food safety issues are important to curb the damage caused by these illnesses at household level. This study examined the food insecurity experiences and food safety knowledge, attitude, and practice (kap) of mothers having outpatient children in Cure Hospital, Addis Ababa, Ethiopia. A sample size of 210 randomly selected mothers was considered for this study. A cross-sectional study was carried out using semi-structured questionnaire to collect data on food insecurity experiences and food safety knowledge, attitude and practice of respondents. Data was analyzed using descriptive statistics. Most respondents were married (68%), had primary or secondary level education (62%), had one or two under-five children (71%), and 52% had monthly income between etb 500 and 2500. Between 70% and 80% of the respondents experienced anxiety or uncertainty of not having enough food for household members or reduced quality or quantity of food they ate in the previous thirty days. Around 58% experienced hunger during the same period. The knowledge of mothers in food safety (food handling, personal hygiene and water sanitation) was generally poor (<60%). The level of positive attitudes of mothers towards food safety was also poor (<60%). Appropriate practices, particularly in food handling and personal hygiene were also very poor. As foodborne illnesses can be fatal to vulnerable members of a household, a thorough training to mothers in food safety issues is recommended.","PeriodicalId":275075,"journal":{"name":"SINET: Ethiopian Journal of Science","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128332678","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}
This paper presents the synthesis of four mononuclear lanthanide (III) complexes, possessing 2, 6-Diphenylisonicotinate as a ligand.The complexes were synthesized in aqueous solution at room temperature in a one to three molar ratios of the Ln (III) salt and the ligand, respectively.The white or grayish powdered complexes that formed were characterized by elemental analysis, ftir, uv, and Fluorescence spectroscopy. The ftir absorption spectra indicated that 2, 6-Diphenylisonicotinate acts as a bidentate ligand and coordinates to Ln (III) through the carboxylate oxygen and the adjacent carbonyl oxygen (–C=O).The UV absorption spectra of the complexes are similar in band profile and shape to the spectrum of the ligand except a slight blue shift of the absorption maxima. The excitation and emission spectra of the complexes are very much similar to that of the ligand with minor differences in excitation and emission wavelengths.The elemental analysis results show a good agreement between the calculated and found percentages of chn. Based on the elemental analysis andspectroscopic resultsof the four complexes, wesuggestthat the compounds formed are nine coordinate around the metal center and have the general formulaLn(C18H12NO2)3.3H2O.
{"title":"Synthesis and characterization of some Lanthanide (III) Complexes based on 2, 6-Diphenylisonicotinic acid","authors":"Z. Gebeyehu, J. Klein, Charles E.Milliron III","doi":"10.4314/sinet.v45i3.3","DOIUrl":"https://doi.org/10.4314/sinet.v45i3.3","url":null,"abstract":"This paper presents the synthesis of four mononuclear lanthanide (III) complexes, possessing 2, 6-Diphenylisonicotinate as a ligand.The complexes were synthesized in aqueous solution at room temperature in a one to three molar ratios of the Ln (III) salt and the ligand, respectively.The white or grayish powdered complexes that formed were characterized by elemental analysis, ftir, uv, and Fluorescence spectroscopy. The ftir absorption spectra indicated that 2, 6-Diphenylisonicotinate acts as a bidentate ligand and coordinates to Ln (III) through the carboxylate oxygen and the adjacent carbonyl oxygen (–C=O).The UV absorption spectra of the complexes are similar in band profile and shape to the spectrum of the ligand except a slight blue shift of the absorption maxima. The excitation and emission spectra of the complexes are very much similar to that of the ligand with minor differences in excitation and emission wavelengths.The elemental analysis results show a good agreement between the calculated and found percentages of chn. Based on the elemental analysis andspectroscopic resultsof the four complexes, wesuggestthat the compounds formed are nine coordinate around the metal center and have the general formulaLn(C18H12NO2)3.3H2O.","PeriodicalId":275075,"journal":{"name":"SINET: Ethiopian Journal of Science","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128327759","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}
Ethiopia is the homeland of Coffee Arabica. Coffee is the major export commodity and a high-income source of foreign currency for the country. In addition to this, coffee has a great role in social interaction between people and is also a source of income for the coffee-producing farmers. Several types of coffee beans grow in Ethiopia. These beans are distinct from each other in terms of quality, color, shape etc. based on their geographical origins. Classification of these coffee beans are based on growing origin, altitude, bean shape and color, preparation method and others. However, the quality of the coffee beans is determined by visual inspection, which is subjective, laborious, and prone to error. This creates the necessity for the development of an automatic method that is precise, non-destructive and objective. Thus, this research aims to develop a model that classifies coffee beans of six different origins of Ethiopia (Jimma, Limmu, Nekemte, Yirgacheffe, Bebeka, and Sidama) in to nine classes. The dataset for this research is collected from the Ethiopian Coffee Quality Inspection and Auction Center (ecqiac). This research followed design science research (dsr) to investigate the problem. Image processing and the state-of-the-art deep-learning techniques were employed to automatically classify coffee bean images into nine different classes grown in six different regions of Ethiopia. A total of 8646 coffee bean images were collected and 1190 images were added using augmentation to make the total dataset 9836. The model is trained and tested by tuning the hyper-parameters of the cnn algorithm. When 80% of the dataset is used for training, 10% for validation, and the remaining 10% for testing, the proposed model achieved a 99.89% overall classification accuracy with 0.92% generalization log-loss. In conclusion, the result of this research shows that deep learning is an effective technique for classification of Ethiopian coffee beans and can be implemented in the coffee industry.
{"title":"Multiclass classification of Ethiopian coffee bean using deep learning","authors":"Getabalew Amtate, Dereje Teferi","doi":"10.4314/sinet.v45i3.6","DOIUrl":"https://doi.org/10.4314/sinet.v45i3.6","url":null,"abstract":"Ethiopia is the homeland of Coffee Arabica. Coffee is the major export commodity and a high-income source of foreign currency for the country. In addition to this, coffee has a great role in social interaction between people and is also a source of income for the coffee-producing farmers. Several types of coffee beans grow in Ethiopia. These beans are distinct from each other in terms of quality, color, shape etc. based on their geographical origins. Classification of these coffee beans are based on growing origin, altitude, bean shape and color, preparation method and others. However, the quality of the coffee beans is determined by visual inspection, which is subjective, laborious, and prone to error. This creates the necessity for the development of an automatic method that is precise, non-destructive and objective. Thus, this research aims to develop a model that classifies coffee beans of six different origins of Ethiopia (Jimma, Limmu, Nekemte, Yirgacheffe, Bebeka, and Sidama) in to nine classes. The dataset for this research is collected from the Ethiopian Coffee Quality Inspection and Auction Center (ecqiac). This research followed design science research (dsr) to investigate the problem. Image processing and the state-of-the-art deep-learning techniques were employed to automatically classify coffee bean images into nine different classes grown in six different regions of Ethiopia. A total of 8646 coffee bean images were collected and 1190 images were added using augmentation to make the total dataset 9836. The model is trained and tested by tuning the hyper-parameters of the cnn algorithm. When 80% of the dataset is used for training, 10% for validation, and the remaining 10% for testing, the proposed model achieved a 99.89% overall classification accuracy with 0.92% generalization log-loss. In conclusion, the result of this research shows that deep learning is an effective technique for classification of Ethiopian coffee beans and can be implemented in the coffee industry.","PeriodicalId":275075,"journal":{"name":"SINET: Ethiopian Journal of Science","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125868047","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}
Mubarek Hussien, Melaku Assefa, Estifanos Ele Yaya
Consumption of edible oils is increasing tremendously regardless of their high prices. As a result, the global production of vegetable oils has also been growing constantly. This may be related to global population growth and associated increasing demands of the consumers. In this particular work, ten crude food seed oils of Ethiopian origin were extracted in our lab and analyzed for their chemical composition by gas chromatography mass spectroscopy (gc-ms). To check their food quality, P/S index of all laboratory extracted seed oils were compared. The fatty acids (fas) concentrations of the oils were determined using decanoic acid methyl ester as internal standard and linoleic acid ethyl ester as a reference. The analysis results indicate that the P/S index for standard crude oils were 8.19 for safflower (sff), 2.58 for sesame (ses), 4.37 for Niger (nig), 5.50 for Linseed (lns), 2.04 for peanut (pnt), 5.13 for Ethiopian mustard (etm) 4.25 for sunflower (suf), 0.09 for palm (pal), 3.14 for soybean (sob), and 1.56 for cotton (cot). The maximum and minimum P/S index were obtained for SFF oil (8.19) and pal oil (0.09), respectively. Analysis of the mixtures of commercial lns and pal oils indicate the improvement of the food quality of the pal seed oil by mixing them in an appropriate ratio.
{"title":"Polyunsaturated verses saturated index as a reference for determining the quality of edible seed oils extracted from locally cultivated oil seeds of Ethiopia","authors":"Mubarek Hussien, Melaku Assefa, Estifanos Ele Yaya","doi":"10.4314/sinet.v45i3.1","DOIUrl":"https://doi.org/10.4314/sinet.v45i3.1","url":null,"abstract":"Consumption of edible oils is increasing tremendously regardless of their high prices. As a result, the global production of vegetable oils has also been growing constantly. This may be related to global population growth and associated increasing demands of the consumers. In this particular work, ten crude food seed oils of Ethiopian origin were extracted in our lab and analyzed for their chemical composition by gas chromatography mass spectroscopy (gc-ms). To check their food quality, P/S index of all laboratory extracted seed oils were compared. The fatty acids (fas) concentrations of the oils were determined using decanoic acid methyl ester as internal standard and linoleic acid ethyl ester as a reference. The analysis results indicate that the P/S index for standard crude oils were 8.19 for safflower (sff), 2.58 for sesame (ses), 4.37 for Niger (nig), 5.50 for Linseed (lns), 2.04 for peanut (pnt), 5.13 for Ethiopian mustard (etm) 4.25 for sunflower (suf), 0.09 for palm (pal), 3.14 for soybean (sob), and 1.56 for cotton (cot). The maximum and minimum P/S index were obtained for SFF oil (8.19) and pal oil (0.09), respectively. Analysis of the mixtures of commercial lns and pal oils indicate the improvement of the food quality of the pal seed oil by mixing them in an appropriate ratio.","PeriodicalId":275075,"journal":{"name":"SINET: Ethiopian Journal of Science","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129701107","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}
In this study, the effect of plasmon resonance on magneto-plasmonic spherical core-shell nanocomposite enclosed in a dielectric host medium is theoretically investigated by applying electrostatic approximation (esa) and Maxwell-Garnet effective medium theories to obtain magneto-optical parameters such as; effective electric permittivity and magnetic permeability as well as the corresponding extinction cross-sections. Likewise, for a fixed size of QDs (of radius nm) numerical analysis was performed to determine the plasmonic resonance effect by varying the parameters such as the metal fraction (β) and the dielectrics (εh) of the host medium on the magneto-plasmonic nanostructures (nss). The results depict that graphs of absorption, scattering, and extinction cross-sections as a function of wavelength have two positions of resonance peaks. The first set of peaks are in the ultraviolet (uv) and the second located in visible regions. These peaks originated from the strong coupling between a regular periodic vibrations of surface plasmons of silver (Ag) with the excitonic state of the dielectric/semiconductor at the internal ( ) and external (Ag/host) interfaces. As β increases, the absorption and scattering cross-sections are blue-shifted in the first peak and red shifted the second set of peaks. Similarly, as εh increases or as β decreases, the sets of resonance peaks for extinction cross-section gets enhanced; while keeping one of these parametric quantities fixed at once. The resulting surface plasmon resonance effect might be utilized in a variety of applications that combines both the plasmonic and magnetic core-shell nanostructures ranging from UV to Visible spectral regions.
{"title":"The effect of surface plasmonic resonances on magneto-plasmonic spherical core-shell nanocomposites","authors":"Kinde Yeneayehu, T. Senbeta, B. Mesfin","doi":"10.4314/sinet.v45i2.2","DOIUrl":"https://doi.org/10.4314/sinet.v45i2.2","url":null,"abstract":" In this study, the effect of plasmon resonance on magneto-plasmonic spherical core-shell nanocomposite enclosed in a dielectric host medium is theoretically investigated by applying electrostatic approximation (esa) and Maxwell-Garnet effective medium theories to obtain magneto-optical parameters such as; effective electric permittivity and magnetic permeability as well as the corresponding extinction cross-sections. Likewise, for a fixed size of QDs (of radius nm) numerical analysis was performed to determine the plasmonic resonance effect by varying the parameters such as the metal fraction (β) and the dielectrics (εh) of the host medium on the magneto-plasmonic nanostructures (nss). The results depict that graphs of absorption, scattering, and extinction cross-sections as a function of wavelength have two positions of resonance peaks. The first set of peaks are in the ultraviolet (uv) and the second located in visible regions. These peaks originated from the strong coupling between a regular periodic vibrations of surface plasmons of silver (Ag) with the excitonic state of the dielectric/semiconductor at the internal ( ) and external (Ag/host) interfaces. As β increases, the absorption and scattering cross-sections are blue-shifted in the first peak and red shifted the second set of peaks. Similarly, as εh increases or as β decreases, the sets of resonance peaks for extinction cross-section gets enhanced; while keeping one of these parametric quantities fixed at once. The resulting surface plasmon resonance effect might be utilized in a variety of applications that combines both the plasmonic and magnetic core-shell nanostructures ranging from UV to Visible spectral regions.","PeriodicalId":275075,"journal":{"name":"SINET: Ethiopian Journal of Science","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114314898","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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