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- 저자 : Workneh, Birhanu Demeke (검색결과 5 건)
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Modelling the Thin-Layer Drying of Beef Biltong Processed Using Hot Air Drying
Muga F. C.,Workneh T. S.,Marenya M. O. 한국농업기계학회 2020 바이오시스템공학 Vol.45 No.4
Purpose This study was conducted to evaluate the drying characteristics and establish the best thin-layer drying model of marinated beef under hot air drying. Methods The drying experiments were conducted in a cabinet dryer at drying air temperatures of 30, 35, and 40 °C, and drying air velocity of 1.5 and 2.5 m s−1. The sample temperature and mass were measured throughout the duration of drying. Results The drying process occurred in the falling rate period. The temperature of the drying air significantly (p ≤ 0.05) influenced the drying characteristics. The velocity of the drying air had no significant (p ≥ 0.05) effect on the drying characteristics apart from the drying rate during the first falling rate period. Diffusion is the predominant mode of moisture transport during the drying of marinated beef. The drying kinetics of marinated beef during its processing to biltong is best described by the two-term model. The effective moisture diffusivity of marinated beef being processed into biltong ranges between 1.60⨉ 10−10m2 s−1 and 2.28 ⨉ 10−10 m2 s−1, while, its activation energy is 28.21 and 17.71 kJ.mol−1 at a drying air velocity of 1.5 and 2.5 m s−1, respectively. Conclusions The results from this study cover the range of temperature and air velocity commonly used in biltong processing; hence, they can be used to optimize the drying process of beef during biltong production.
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Expression of miR-29a in whole Blood of Patients with Colorectal Neoplasm
황다솜,김다혜,장윤희,Workneh Korma Hirgo,이혜영 대한의생명과학회 2021 Biomedical Science Letters Vol.27 No.4
Colorectal cancer (CRC) is major cancer with high incidence and mortality worldwide. It is known that most CRCs arise from precursor adenomatous polyps (APs). Recently, microRNA (miRNA) has been proposed as a biomarker for various cancers including CRC. In this study, the expression patterns of miR-29a in the whole blood (WB) of CRC, AP, and control groups were analyzed by reverse transcriptase-quantitative polymerase chain reaction (RT-qPCR) to evaluate the expression level of miR-29a in patients with colorectal neoplasm (CRN) including CRC and AP. As a result, the relative expression of miR-29a was significantly decreased in the patients with CRN compared to the control group (P<0.001). The results were in agreement with previous in vitro cell studies and studies that used tissue and feces samples, suggesting that miR-29a in WB may be useful in demonstrating the status of colorectal tissue. Additionally, we divided the control group into healthy control (HC) without any colorectal symptoms and non-tumor control (NTC) with colorectal symptoms but without any CRN. And then the relative expression of miR-29a was also significantly decreased in the NTC group compared to the HC group (P<0.001). Therefore, our study revealed that miR-29a can differentiate patients with CRN from HC group, but they are also involved in the early stage of inflammatory response and cannot be specific biomarkers for CRN.
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Bayked, Ewunetie Mekashaw,Workneh, Birhanu Demeke,Kahissay, Mesfin Haile The Korean Society for Preventive Medicine 2021 예방의학회지 Vol.54 No.2
Objectives: Ongoing, proactive, planned, and patient-centered diabetes education is the cornerstone of care for all persons with diabetes. Thus, the aim of this study was to explore the information needs of type 2 diabetes mellitus patients receiving insulin treatment in North-East Ethiopia. Methods: The study was conducted from July 2019 to January 2020 using a qualitative enquiry (phenomenological approach) with purposive sampling. Face-to-face in-depth interviews were used to collect data until reaching theoretical saturation. The participants were type 2 diabetes patients receiving insulin treatment. They were identified from the diabetes patients' registration book at the diabetes clinic and interviewed at their appointment time, and were selected to include wide variations in terms of socio-demographic characteristics. Twenty-four participants (11 men and 13 women), with a median age of 57 years, were interviewed. The data were organized using QDA Miner Lite version 2.0.7 and analyzed thematically using narrative strategies. Results: Most participants had not heard of diabetes before their diagnosis. They had limited knowledge of diabetes, but ascribed different connotations for it in the local language (Amharic). The needs reflections of patients were categorized into diabetes education and participants' recommendations. Diabetes education was totally absent at hospitals, and patients received education primarily from the Ethiopian Diabetes Association and broadcast and digital media. Thus, the major concern of patients was the availability of diabetes education programs at health institutions. Conclusions: Patients' main concern was the absence of routine diabetes education, which necessitates urgent action to implement diabetes education programs, especially at health institutions.
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Muga F. C.,Marenya M. O.,Workneh T. S. 한국농업기계학회 2021 바이오시스템공학 Vol.46 No.3
Purpose The aim of this study was to develop a coupled heat and mass transfer model to predict the temperature and moisture content of beef during biltong processing using infrared-assisted hot air drying (IRHAD). Methods The developed model was implemented and solved using Ansys Fluent CFD software. Drying experiments conducted using an infrared-assisted hot air dryer were used to determine the moisture diffusivity, and the heat and mass transfer coefficients used in the model. The experiments were done at an infrared emitter power level of 750 W; drying air temperature of 30, 35, and 40 °C; and velocity of 1.5 and 2.5 m s−1. Results The simulation slightly overpredicted the temperature in the first hour of drying and underpredicted the temperature towards the end of the drying period. Consequently, the predicted moisture ratio (MR) was underpredicted at the onset of drying and agreed with the experimental values towards the end of the drying period. The simulation results were validated using a new set of experimental results, and the suitability of the model assessed using the R2 (0.9790 for temperature and 0.9579 forMR) and RMSE (1.99 for temperature and 0.0698 for MR). Conclusion The model can guide the application of IRHAD in the processing of biltong and forms a theoretical basis for analysing the application of IRHAD to other food and biobased products.
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