Toksisitas Letal (LC50) Zat Surfaktan Linear Alkylbenzene Sulfonate terhadap Ikan Cere (Gambusia affinis): Lethal Toxicity (LC50) of Linear Surfactant Alkylbenzene Sulfonate on Mosquito Fish (Gambusia affinis)

Mosquito fish (Gambusia affinis) is a species often used as a bioindicator because it has high adaptability to water quality changes. Linear alkylbenzene sulfonate (LAS) is a surfactant often found in waters and can cause death for the biota that lives in it. This study aimed to analyze the impact of LAS surfactant on the survival of mosquito fish and to determine the minimum concentration of LAS surfactant that can cause death and tissue damage. Research conducted during April 2022 using 500 mosquito fishes. We did several tests, including a lethal toxicity test to find out the concentration of LAS surfactant that can cause death and tissue damage. The results showed that the LC50 values of LAS surfactants at exposure times of 24, 48, 72, and 96 hours were 7.64, 7.43, 7.29, and 6.83 mg/L, respectively. Mosquito fish blood glucose levels at LAS concentrations of 0, 2.65, 4.30, 6.97, and 11.3 were 56, 75, 79.6, 95, and 95.6 mg/dl. Exposure to LAS surfactant in mosquito fish can cause gill damage in the form of edema, lamella fusion, hyperplasia, lamellae epithelium swelling, and gill filaments necrosis. Another damage occurs to the liver in the form of blockage of blood vessels and sinusoids, hyperplasia, widening of the hepatic sinusoid gap, fat accumulation, and necrosis of hepatocytes

Correlation between Stress and Eating Behaviour in College Students: A Longitudinal Study

Stress is a process that involves the perception of and response to pressure and is often related to eating behaviour. For college students, academic stress could be one factor that affects eating behaviour. So far, no longitudinal study has directly compared the same respondents’ stress levels and eating behaviours in different years of study. Thus, this study aimed to examine changes in stress levels and eating behaviour during college students’ third and final years and determine the correlation between stress levels and eating behaviour. We asked 89 undergraduate students (27 males and 62 females) to complete a questionnaire on their stress levels using the Perceived Stress Scale (PSS-10) and their eating behaviour. Our results showed that students had significantly higher stress levels during the final year than in their third year. Our results also showed that during the student’s final year, there was a significant increase in eating when feeling stressed, overeating, eating fast food, and skipping meals compared to their third year. There was also a significant decrease in healthy food consumption during the final year compared to the third year. During the third year of study, stress levels were increased by academic workload pressure; meanwhile, during the final year of study, they were affected by sex and undergraduate thesis pressure. These results indicate that differences in academic pressure in different years of study can influence stress levels and eating behaviour in college students

STAKEHOLDERS’ ATTITUDE TOWARD ECOTOURISM DEVELOPMENT IN RINJANI-LOMBOK GEOPARK: THE EVIDENCE FROM MOUNT RINJANI NATIONAL PARK

Based on stakeholder and social exchange theory, this study examined a model of the re­la­tionship between stakeholder awareness, perception of impact (environmental, economic, and socio-cultural), and attitude toward ecotourism development in Mount Rinjani National Park (MRNP). The model was tested using a sample of 157 stakeholders. Data were collected by surveying and analyzing using the partial least squares. The results showed that only perception of the economic impacts of ecotourism partially mediated the relationship between awareness and attitude toward ecotourism development. From the perspective of stakeholder theory, the perceived impacts are he­terogeneous. These differences will determine their attitude toward the level of support and parti­ci­pation. From the perspective of social exchange theory, the study showed that attitude toward eco­tourism development is directly influenced by awareness of ecotourism and the perception of eco­nomic impact. The stakeholders on MRNT have a more compromising attitude toward ecotourism development to the socio-cultural and environmental impacts

PENGARUH PEMBERIAN JUS TOMAT TERHADAP KADAR GLUKOSA DARAH PADA PREDIABETES

Latar Belakang : Prediabetes merupakan kondisi dimana kadar glukosa darah seseorang berada diantara kadar normal dan diabetes. Pengaturan diet merupakan cara efektif untuk menurunkan kadar glukosa darah. Jus Tomat merupakan salah satu bahan minuman yang dihubungkan dengan penurunan kadar glukosa darah. Penelitian ini bertujuan untuk membuktikan pengaruh pemberian jus tomat terhadap kadar glukosa darah pada prediabetes. Metode : Penelitian ini merupakan penelitian pra eksperimen dengan rancangan one group pre test-post test design. Subjek penelitian adalah warga Kelurahan Sendangguwo Semarang yang diambil secara consecutive sampling. Besar sampel adalah 21 orang. Tiap sampel diberi jus tomat sebanyak 200 ml yang berasal dari 180 gram tomat merah jenis Lycopersicum commune yang di-blanching dengan air pada suhu 70-90°C selama 10 menit kemudian diblender dan disaring. Intervensi jus tomat diberikan selama 3 minggu. Kadar glukosa darah puasa diukur satu hari sebelum dan satu hari setelah intervensi dengan menggunakan metode spektrofotometri. Selama intervensi, asupan makan diperoleh dengan metode food recall 3×24 jam. Data yang diperoleh dianalisis menggunakan uji Shapiro Wilk dan paired t- test. Hasil : Terjadi penurunan kadar glukosa darah puasa sebesar 9,00 mg/dl (7,64%) setelah pemberian jus tomat selama 3 minggu. Simpulan : Uji statistik menunjukkan terdapat perbedaan bermakna terhadap penurunan kadar glukosa darah puasa sebelum dan setelah pemberian jus tomat