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Non-destructive Methods to Determine Ripening Quality of Intact Muskmelon
( Tilahun,S. ),( M. H. Seo ),( H. R. Choi ),( D. S. Park ),( T. Solomon ),( C. S. Jeong ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2019 강원 농업생명환경연구 Vol.31 No.1
Muskmelons do not exhibit significant external evidence of ripening because of their hard and thick rinds, increasing the likelihood of purchasing an unripe fruit. In this study, the non-destructive estimation of fruit ripening quality of intact “Honey One” and “Earl’s Talent” muskmelon cultivars was examined. We analyzed the correlation between the major characteristics used for assessing ripening quality (firmness, total soluble solids (TSS), and titratable acidity) and stalk moisture and specific gravity. Moreover, partial least square (PLS) regression analysis was performed for the visible/near-infrared (Vis/NIR) spectroscopy data and reference samples. The correlation coefficients (r) between stalk moisture and flesh firmness were 0.88 and 0.77 for the “Earl’s Talent” and “Honey One” cultivars, respectively. In addition, the specific gravity and flesh firmness of the fruits were negatively correlated; r = -0.65 and r = -0.63 for the “Honey One” and “Earl’s Talent” cultivars, respectively. Moreover, the PLS analysis of the calibration set revealed the determination coefficients (R<sup>2</sup>) of 0.73 and 0.54 for “Earl’s Talent” and “Honey One”, respectively, for firmness vs. Vis/NIR spectral values. In addition, the PLS analysis of the prediction set showed r<sup>2</sup> = 0.51 for “Honey One” and r<sup>2</sup> = 0.50 for “Earl’s Talent”. Hence, this study highlighted the possibility of using the status of fruit stalk, specific gravity, and Vis/NIR spectra to predict the ripening quality of muskmelons. However, further studies are necessary to develop more robust non-destructive methods for the estimation of the ripening quality of intact muskmelons.
Prediction of lycopene and β-carotene in tomatoes by portable chroma-meter and VIS/NIR spectra
Tilahun, Shimeles,Park, Do Su,Seo, Mu Hong,Hwang, In Geun,Kim, Seok Hyeon,Choi, Han Ryul,Jeong, Cheon Soon Elsevier 2018 Postharvest biology and technology Vol.136 No.-
<P>The aim of this study was to examine the possibility of non-destructive estimation of lycopene and beta-carotene content in intact tomato fruit. Representative tomato fruits were harvested at different maturity stages and measurement of visible/near infrared (VIS/NIR) spectra and color variables were followed by reference analysis of lycopene and beta-carotene. Models predicting lycopene and beta-carotene from color variables and VIS/NIR spectra of intact tomato were developed. Regression coefficient between color variables (a*, a*/b*, and (a*/b*) 2) and reference values of lycopene and beta-carotene content were (0.90, 0.98 and 0.52) and (0.75, 0.81 and 0.58), respectively for the prediction set. Meanwhile, after observing predictive p-values in multiple regression, best equations were developed to predict the contents of lycopene and beta-carotene from color values with regression coefficient of 0.97 and 0.85 for lycopene and beta-carotene, respectively. On the other hand, the selected partial least square (PLS) model of VIS/NIR spectra had good predictive power for lycopene and beta-carotene showing high correlation coefficient of 0.85 and 0.77, respectively, between measured and predicted samples. This study revealed that, estimation of the lycopene and beta-carotene content in tomatoes could be achieved by a portable chroma meter and VIS/NIR spectroscopy, with a possible application at field and agricultural processing centers, respectively.</P>
Tilahun Temesgen 서울대학교 경제연구소 2005 Seoul journal of economics Vol.18 No.4
This study estimates the returns to education for workers in the Ethiopian manufacturing sector, and investigates additional determinants of hourly wages other than education. It starts the analysis using the standard framework of a Mincerian earnings function focusing on individual level characteristics as determinants of wages. The standard framework (basic Human Capital Model) is then augmented by controlling for firm level characteristics that are believed to play important roles in wage determination. In the basic model, the returns to one year of schooling for an Ethiopian manufacturing worker is around 10% for both men and women in the basic model - which is relatively small compared with estimates for other developing countries. When additional variables including firm level characteristics are controlled for, the returns to education go further down to about 8% for men and 9% for women. Conditional on schooling, the basic model estimates show that each additional year of labor market experience increases hourly wages by 6.0% for men and by 7.8% for women.
( Tilahun S. ),( H. S. An ),( H. R. Choi ),( D. S. Park ),( J. S. Lee ),( C. S. Jeong ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2019 강원 농업생명환경연구 Vol.31 No.3
Processing-related quality parameters and total glycoalkaloid content of tubers of ‘Atlantic’ and ‘Solbong’ potato cultivars were evaluated over a 12-week storage period at 10°C and 20°C with 85-90% relative humidity in the darkness. Also, data on color, acrylamide formation, and overall sensory responses were collected after processing into chips. Our study revealed that both cultivars had high dry matter content and specific gravity and were suitable for extended storage without significant deterioration in processing quality. Nevertheless, storage temperature interactions significantly (p < 0.05) influenced the storage quality of the tubers and affected the quality of potato chips. Chips produced from ‘Solbong’ tubers stored at 10°C had a brighter color and low acrylamide formation. It was also observed that there was a progressive increase in total glycoalkaloid content in both cultivars during the storage period, particularly at 20°C. However, it did not exceed the safe upper limit for human consumption. Interestingly, the tubers of both cultivars stored at 10°C were suitable for processing without leading to high α-solanine and α -chaconine levels for 12 weeks. Besides, the acrylamide formation in both cultivars was kept low by storage at 10°C. Hence, storing tubers of ‘Atlantic’ and ‘Solbong’ under 10°C with 85-90% relative humidity in darkness could prolong the shelf life of tubers without affecting the nutritional quality during processing. Further studies on other cultivars for extended storage periods are necessary to strengthen our findings.
Tilahun Bejitual Zellelew 한국외국어대학교 HK 세미오시스 연구센터 2015 Signs and Society Vol.3 No.1
The knife, a synecdoche of slaughtering, is an important culinary tool that is charged with the power of religious speech acts and that has a significant semiotic function in Christian-Muslim encounters in Ethiopia. The slaughtering rituals not only transform the neutral natural animal into a sacred cultural food but also invest the meat with an intense aura of disgust among followers of the other faith. The slaughtering narratives continue to manifest themselves in other public signs, namely, in the Cross and the Crescent, on butcheries, and restaurants, for example. These two universal signs are the corollaries of an anterior sign, in other words, the knife that, in the discursive realm of food and religious identity in Ethiopia, implicates the different slaughtering rituals of Orthodox Christians and Muslims.
Empirical Review of Production, Productivity and Marketability of Soya Bean in Ethiopia
Urgessa Tilahun Bekabil 보안공학연구지원센터(IJUNESST) 2015 International Journal of u- and e- Service, Scienc Vol.8 No.1
This review of research presents recent Soybean related studies conducted in Ethiopia. After a brief contextualization of the discourse regarding Soybean market chain, production and productivity researches globally, materials specific to Ethiopia is discussed in argument, synthesizing the types of findings, summarizing the trends and highlighting knowledge gaps. A review of this nature makes diverse research results available and accessible, facilitates knowledge translation and enables researchers to identify areas for future research.
Shimeles Tilahun,박도수,Adanech Melaku Taye,정천순 한국식품과학회 2017 Food Science and Biotechnology Vol.26 No.2
This study was conducted to assess the physicochemical changes and overall nutritional implications of greenhouse-grown “TY Megaton” and “Yureka” tomato cultivars under on-vine and postharvest ripening conditions. In the first group, tomatoes were harvested from a vine at the breaker, pink, and red ripening stages and sampled immediately. The second group was harvested at the breaker stage and allowed to ripen under room conditions to the pink and red stages based on color values, similar to the vine-ripened samples. The results of the present study revealed that fresh weight loss was below the maximum acceptable weight loss and firmness was above the minimum limit of marketing after postharvest ripening to the pink and red stages; moreover, this process did not have any deleterious effect on the antioxidant properties or antioxidant activity of the tomatoes. Hence, the results clearly indicate that breaker-stage tomatoes can be postharvest-ripened under room conditions without affecting their marketability and nutritional components.