UMA - Open Access Journals (Universitas Medan Area)
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ECO-FRIENDLY INNOVATION: POTENTIAL OF RED DRAGON FRUIT PEEL EXTRACT IN SILVER NANOPARTICLE BIOSYNTHESIS
Get PDFEast Kalimantan is one of the regions that cultivates red dragon fruit (Hylocereus polyrhizus) in large quantities due to its promising health benefits. The peel of red dragon fruit has antioxidant activity comparable to its flesh, yet it is rarely utilized and often discarded as organic waste. This study aims to explore the potential of water and ethanol extracts from red dragon fruit peel as antioxidant sources that can serve as natural reducing and stabilizing agents in the biosynthesis of silver nanoparticles (AgNPs). Extraction using water and ethanol solvents was conducted to analyze the antioxidant compounds in the peel. The extract with the strongest antioxidant activity was used for AgNP biosynthesis, and the absorption peak was observed using UV-Vis spectrophotometry at a specific wavelength of 400–450 nm, which is characteristic of AgNP surface plasmon resonance. The results showed that the ethanol extract exhibited stronger antioxidant potential based on its lower IC₅₀ value and functioned effectively as a reducing and stabilizing agent at synthesis temperatures of 40–50°C, without degrading the extract's secondary metabolites. These findings support the utilization of red dragon fruit peel as a sustainable and eco-friendly raw material for the development of health-related products
EVALUATION OF THE CAPABILITY OF IMMOBILIZED CHLORELLA VULGARIS (BEIJERINCK, 1890) IN ALGINATE BEAD MATRIX AS A BIOADSORBENT FOR HEAVY METAL ZINC (Zn)
Get PDFBioremediation intends to use living organisms to remove or decompose pollutants, using their ability to metabolize or accumulate hazardous substances, thus reducing toxicity. This study aims to compare the removal efficiency of free suspended Chlorella vulgaris and immobilized Chlorella vulgaris. Monoculture isolates of Chlorella vulgaris were cultured in an aqueous medium with KW21 fertilizer for approximately 12 days until reaching the stationary phase. The biomass was harvested, dried, and separated. A ZnCl₂ solution was prepared with 2, 4, and 8 ppm working concentrations. The biosorption efficiency was calculated to evaluate the biosorption capacity. The results indicated that the removal efficiency of free suspended C. vulgaris was 14.73%, 6.76%, and 10.22% for the respective concentrations. Immobilized C. vulgaris exhibited significantly higher removal efficiencies of 73.79%, 77.87%, and 83.80%. This study shows that immobilizeed C. vulgaris have a higher removal efficiency value than free suspended C. vulgaris cells because they can withstand heavy metal toxicity better. This study implicates that the treatment of alginate beads increases the stability and effectiveness of biosorption, and makes this method a preferred approach for heavy metal bioremediation applications in aquatic environments
Karakteristik Tanaman Jeruk (Citrus sp.) Di Plot Biospropeksi Spesies Jeruk Terpilih
Get PDFCitrus (Citrus sp.) is a strategic horticultural commodity with not only high economic value but also significant biodiversity that supports both conservation and breeding efforts. This study is motivated by the need to identify local citrus varieties that are adaptive to environmental changes and possess promising genetic potential. The objective of this research is to describe the vegetative and generative morphological characteristics of citrus plants within a biosprospection plot of selected species. A descriptive-explorative approach was employed through direct field observation of five local citrus varieties: limau nipis, limau kasturi, limau muncung, limau pagar, and limau mata kerbau. Morphological observations covered characteristics of leaves, stems, and fruits, documented through visual notes and photographic records. The results revealed significant phenotypic variation among the varieties, particularly in canopy shape, leaf morphology and color, presence of stem thorns, as well as fruit size, color, and taste. For instance, limau pagar exhibited thorny stems and deeply wrinkled fruit, while limau mata kerbau bore large, sweet, and refreshing fruits with broad leaves as a form of ecological adaptation. These findings highlight the role of biosprospection plots as natural laboratories for conserving genetic resources and selecting adaptive varieties. The study’s outcomes are expected to contribute to germplasm preservation and the sustainable development of local-species-based horticulture.
Citrus (Citrus sp.) is a strategic horticultural commodity with not only high economic value but also significant biodiversity that supports both conservation and breeding efforts. This study is motivated by the need to identify local citrus varieties that are adaptive to environmental changes and possess promising genetic potential. The objective of this research is to describe the vegetative and generative morphological characteristics of citrus plants within a biosprospection plot of selected species. A descriptive-explorative approach was employed through direct field observation of five local citrus varieties: limau nipis, limau kasturi, limau muncung, limau pagar, and limau mata kerbau. Morphological observations covered characteristics of leaves, stems, and fruits, documented through visual notes and photographic records. The results revealed significant phenotypic variation among the varieties, particularly in canopy shape, leaf morphology and color, presence of stem thorns, as well as fruit size, color, and taste. For instance, limau pagar exhibited thorny stems and deeply wrinkled fruit, while limau mata kerbau bore large, sweet, and refreshing fruits with broad leaves as a form of ecological adaptation. These findings highlight the role of biosprospection plots as natural laboratories for conserving genetic resources and selecting adaptive varieties. The study’s outcomes are expected to contribute to germplasm preservation and the sustainable development of local-species-based horticulture
Legal Protection of Children's Rights in Early Marriage
Get PDFThis article aims to find out the age of readiness to marry in early marriage in the review of Islamic law and Indonesian Positive Law against early marriage and legal protection of children's rights in early marriage. The problem is focused on how the readiness age of marriage in early marriage based on Islamic law and positive law, how legal protection of children's rights in early marriage. The theoretical references used are the theory of legal protection and the theory of benefit in Islamic law. Data were collected through literature study and analyzed qualitatively. This study concludes that the readiness of marriage age in Islamic Law can be carried out by prospective brides who have not or have reached puberty if they have fulfilled the conditions and pillars of marriage by paying attention to the benefits. Based on the Compilation of Islamic Law, the minimum age of marriage for men is 19 years and for women is 16 years. Based on Positive Law Marriage Law No. 16 of 2019 in Article 7 Paragraph (1) marriage is permitted if the man and woman reach the age of 19 years. If in certain circumstances married under the age of 19 years can apply for Dispensation to the Court with urgent reasons and supporting evidence. In early marriage, legal protection of children's rights includes age limits, marriage dispensation and protection of children's rights including protection of education and awareness, supervision and protection from violence, physical and mental readiness, agreement and consent in early marriage. With this protection, the rights of children in early marriage can be protected
Sentiment Analysis of Indonesian X Users in the Israeli Product Boycott Movement
Get PDFThis study examines the sentiment of Indonesian users on the social media platform X regarding the boycott movement of Israeli products. The movement, rooted in the global Boycott, Divestment, and Sanctions (BDS) campaign, reflects strong pro-Palestinian sentiment in Indonesia. Using sentiment analysis techniques, including VADER, 4,002 tweets from October 2023 to August 2024 were analyzed to classify sentiments as positive, negative, or neutral. Results reveal that 63% of tweets express negative sentiment, supporting the boycott movement; 33% indicate positive sentiment, opposing the movement; and 4% remain neutral. Peaks in tweet activity coincide with significant events, such as the Indonesian Ulema Council's fatwa and geopolitical developments. The study also explores factors influencing public engagement, including hashtag usage, timing, and influencer participation. Findings highlight the role of social media in shaping public opinion and mobilizing collective action while contributing to academic discourse on digital platforms as arenas for cultural and political expression
Observasi Interaksi Sosial dan Aktivitas Fisik pada Ruang Hijau di Masjid
Get PDFThe relationship between green spaces and humans has long been recognized as one of the important aspects of life, especially in urban contexts. In urban environments, green spaces are often found in public areas, serving as places for recreation, sports, and social interaction, as well as helping to reduce pollution and noise. One common form of public space in Indonesia is the mosque, which not only functions as a place of worship but also plays an important role as a center for social, cultural, and educational activities. If a mosque provides green space, it can positively impact urban well-being. The aim of this research is to understand the role of green spaces in mosques in enhancing social interaction and human physical activity. The literature study method was used to collect and analyze previously published information related to the topic. Another method used is field observation with a behavior mapping approach to record and analyze social interactions and physical activities occurring in the green spaces of three mosques with different green space conditions over a certain period of time. The results of the study show that there are longer durations of social interactions and physical activities such as communicating, relaxing, playing, and worshiping in mosques with green spaces compared to those without green spaces. Thus, it is concluded that green spaces in mosques can be optimized as places for social interaction and physical activity, providing numerous benefits to the community, including improved physical and mental health and an overall enhanced quality of life
Transforming Public Procurement: The Organizational Change Model of UKPBJ Central Buton
Get PDFThis article aims to analyze the organizational transformation of the goods and services procurement unit in Central Buton Regency using Kurt Lewin’s change theory and change management perspectives. This research employed a qualitative descriptive approach, collecting data through interviews, observation, and document analysis. Data were analyzed qualitatively through preparation, organization, reduction, and presentation. The transformation occurred in three stages: unfreezing through the socialization of changes in structure, human resources, risk, technology, and budget, change with the formation of a centralized, performance-driven structure, and refreezing through capacity building, functional staffing, technology enhancement, and budget adjustment. The resulting model integrates Lewin's framework with transformational leadership, competent teams, human resources development, and technological innovation
The Effect of Servant Leadership on Employee Creativity with Employee Engagement and Employee Resilience as Mediation
Get PDFThis study aims to examine the effect of servant leadership on employee creativity, employee engagement and employee resilience in commuting female workers in private companies. As well as evaluating the mediating role of employee engagement and employee resilience on the relationship between servant leadership and employee creativity. Using purposive sampling method, and distributing online questionnaires, to female workers in private companies in the period March to May 2024. Respondents were collected as many as 154 people who had a distance to work of more than 20 km and used public transportation. Data were analyzed using the Structural Equation Model (SEM). The results showed that servant leadership has a positive effect on employee creativity and employee resilience. besides that employee resilience has a positive effect on employee engagement and employee creativity. these findings also show that employee engagement has a positive effect on employee creativity. And Employee resilience and Employee engagement mediate the effects of Servant leadership and employee creativity. The managerial implications of this study emphasize the importance of developing servant leadership and employee resilience to increase engagement and creativity in the workplace. The limitation of this study is the generalization of results that are limited to female employees only. Future research is recommended to explore other variables that affect servant leadership, employee engagement, and employee creativity
Perilaku Overprotective Orang Tua dan Self Disclosure pada Remaja Yang Coming Out Sebagai Queer
Get PDFPenelitian ini bertujuan untuk menganalisis pengaruh perilaku overprotective orang tua terhadap self-disclosure pada remaja yang coming out sebagai queer. Self-disclosure merupakan aspek penting dalam perkembangan identitas individu, terutama bagi remaja yang mengidentifikasi diri sebagai queer. Namun, keterbukaan diri ini dapat dipengaruhi oleh berbagai faktor, termasuk pola asuh orang tua yang overprotective. Penelitian ini menggunakan pendekatan kuantitatif dengan desain regresi linier sederhana. Sampel terdiri dari 110 remaja yang telah coming out sebagai queer. Pengumpulan data dilakukan melalui kuesioner yang mengukur perilaku overprotective orang tua dan tingkat self-disclosure. Hasil penelitian menunjukkan bahwa terdapat hubungan positif yang signifikan antara perilaku overprotective orang tua dan self-disclosure pada remaja yang coming out sebagai queer (r = 0,889, p < 0,05). Implikasi dari penelitian ini menyoroti pentingnya pendekatan orang tua yang lebih mendukung dan terbuka dalam menerima identitas anak mereka, sehingga dapat menciptakan lingkungan yang lebih aman bagi remaja queer untuk melakukan self-disclosure
Tumbuh Bersama: Intervensi Keterampilan Sosial-Emosional dan Pengasuhan Positif pada Anak dan Pengasuh di Panti Asuhan
Get PDFKehidupan di panti asuhan dipenuhi oleh berbagai pengalaman menantang bagi anak maupun pengasuh. Dengan segala keunikannya, anak yang tinggal di panti asuhan ditemukan memiliki berbagai masalah perilaku eksternalisasi dan emosi, yaitu ketidakpatuhan serta agresi verbal dan fisik. Di sisi lain, tantangan yang dirasakan pengasuh terdiri dari jam kerja dan beban kerja yang berat, terutama jika anak menunjukkan berbagai masalah perilaku. Penelitian ini bertujuan untuk mengetahui efektivitas intervensi yang melibatkan anak dan pengasuh dalam menurunkan masalah perilaku anak dan meningkatkan penerapan penagsuhan positif oleh pengasuh. Partisipan terdiri dari 4 orang anak laki-laki usia 6-7 tahun dan 2 orang pengasuh yang bertugas di Panti Sosial Asuhan Anak X. Penelitian ini menggunakan desain quasi-experimental one-group pretest-posttest dengan tiga alat ukur: Child Behavior Checklist (CBCL), serta kuesioner perilaku anak dan pengasuhan positif. Hasil penelitian menunjukkan bahwa terdapat peningkatan masalah perilaku eksternalisasi pada anak dan peningkatan penerapan pengasuhan positif pada pengasuh setelah intervensi. Secara kualitatif, anak menunjukkan penurunan masalah perilaku dan peningkatan kepatuhan terhadap pengasuh. Hasil ini menekankan pentingnya kerja sama antara anak, pengasuh, dan seluruh pihak panti asuhan dalam mengembangkan keterampilan sosial-emosional pada anak.