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Green Feed Innovation with Goat Milk Yogurt Casein to Mitigate Dioxin Accumulation in Nile Tilapia Nur Aeni; Sri Magfirah HS
ARRUS Journal of Engineering and Technology Vol. 5 No. 2 (2025)
Publisher : PT ARRUS Intelektual Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35877/jetech4470

Abstract

Dioxins are toxic and persistent organochlorine pollutants that bioaccumulate in fish tissues, posing health risks to consumers. This study evaluated the potential of casein isolated from goat milk yogurt as a bioprotective agent to reduce dioxin bioaccumulation in Nile tilapia (Oreochromis sp.). A Completely Randomized Design (CRD) was employed with three groups: a negative control (no exposure), a positive control (dioxin exposure), and a therapy group (dioxin exposure plus dietary casein supplementation). Fish were maintained for 30 days, consisting of 15 days of dioxin exposure followed by 15 days of casein therapy. Survival rate was highest in the negative control (100%), intermediate in the therapy group (67%), and lowest in the positive control (17%). Gas Chromatography–Mass Spectrometry (GC–MS) analysis showed that casein supplementation reduced dioxin concentration in muscle tissue threefold compared with the positive control (0.02% vs. 0.06%; p < 0.001). Histopathological analysis further indicated that casein attenuated hepatic damage, with a lower damage score in the therapy group (10) compared to the positive control (16). These findings suggest that casein from goat milk yogurt has potential as a functional feed ingredient to suppress dioxin accumulation and mitigate toxic effects in fish, although full physiological recovery was not achieved.
Exploring the Effects of Teacher’s Nonverbal Communication on EFL Students' Academic Motivation Mutia Asisyifa; Maemuna Muhayyang; Nur Aeni
IDEAS: Journal on English Language Teaching and Learning, Linguistics and Literature Vol. 13 No. 2 (2025): IDEAS: Journal on English Language Teaching and Learning, Linguistics and Lite
Publisher : Institut Agama Islam Negeri Palopo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24256/ideas.v13i2.7428

Abstract

Teacher’s nonverbal communication significantly effects students’ learning experiences, particularly in EFL Islamic classroom context where language and motivation are closely linked. This study examined the effects of teachers’ nonverbal communication on students’ academic motivation using an explanatory sequential mixed-methods design. Quantitative data were collected from 60 students through questionnaires measuring seven aspects of nonverbal communication namely proxemics, haptics, kinesics, chronemics, oculesics, physical environment, and paralanguage and three aspects of motivation that is, autonomy, competence, and relatedness. Qualitative data were obtained through classroom observations and interviews with ten selected students. Findings revealed that kinesics and proxemics received the highest ratings, indicating active use of gestures and classroom movement to engage students. Haptics and paralanguage scored lowest, suggesting limited use due to cultural norms. Correlation and regression analyses indicated a strong positive relationship between teachers’ nonverbal communication and student motivation. Observations confirmed that smiling, nodding, using hand gestures, and approaching students created a positive and low-anxiety learning atmosphere. Interviews supported these results, with students expressing greater confidence, comfort, and willingness to participate when teachers-maintained eye contact, used expressive gestures, and adjusted their proximity. This study highlights the importance of nonverbal behaviors in fostering a motivating EFL learning environment. Teachers’ awareness and intentional use of such cues can strengthen engagement and emotional connection, even in culturally specific settings.