A cross-sectional study was conducted on 40 women weavers of Samarinda sarongs to identify the prevalence and risk factors of musculoskeletal disorders (MSDs). A Nordic body map, rapid upper limb assessment and anthropometric tools were used to plot the MSD severity, work posture and anthropometric dimensions of the weavers, respectively. The age, education background, working period and prolonged sitting position distributions of the weavers were collected by direct interview. Pearson's product-moment correlation was applied to identify correlations between the MSD prevalence and other parameters. An MSD prevalence of 80.5% was found among the women weavers, with the MSDs categorized as low, moderate and high in 15.0, 75.0 and 7.5% of the respondents, respectively. The MSD prevalence was significantly correlated with education background (p = 0.025), working period (p = 0.015), prolonged sitting hours (p = 0.032), work posture (p < 0.001) and weavers’ anthropometry (p < 0.001).

Kerupuk ikan gabus telah dikenal luas namun biasanya terbuat dari bagian dagingnya saja. Limbah berupa tulang ikan belum dimanfaatkan secara optimal, oleh karena itu dijadikan sebagai bahan substitusipada pembuatan produk kerupuk. Tujuan penelitian ini adalah untuk menentukan pengaruh substitusi tepung tulang ikan gabus (TTIG) sebagai fortifikan kalsium terhadap sifat sensoris dan fisika-kimia kerupuk ikan gabus. Penelitian ini menggunakan rancangan acak lengkap dengan perlakuan substitusi tepung tulang ikan gabus dalam tepung tapioka dengan kadar (0; 4; 8; 12; dan 16% b/b) dan di ulang sebanyak empat kali. Parameter yang dianalisis pada penelitian ini adalah sifat sensoris dan sifat fisika-kimia. Hasil penelitian menunjukkan bahwa substitusi TTIG berpengaruh nyata (p<0,05) terhadap sifat sensoris rasa, aroma, warna dan tekstur serta sifat fisika-kimia kerupuk ikan gabus. Peningkatan kadar TTIG menurunkan kadar air dan volume pengembangan kerupuk ikan gabus, tetapi meningkatkan kadar protein dan kadar kalsium (p<0,05). Substitusi TTIG sampai dengan 4% menghasilkan kerupuk ikan gabus dengan volume pengembangan yang sama dengan kontrol (tanpa substitusi TTIG) dengan kadar kalsium 200 mg/100 g dan kadar protein 14,27%. Rasa dan warna kerupuk ikan gabus disukai hingga substitusi TTIG 12%, sedangkan aroma dan tekstur disukai hingga substitusi TTIG 8%.

Cassava leaves contain albumin, fat, carbohydrates, vitamin A, vitamin B1, and fibers, thus having the potential to be used as an ingredient in production of cookies. The purpose of this research was to determine the optimum ratios between wheat flour, cassava puree and cassava leaves flour to produces cookies with good nutritional profile. This study was conducted as Completely Randomized Designs with five treatment, namely the ratios between wheat flour: cassava puree: cassava leaves flour (WF:CP:CLF) in grams of 50 : 50 : 0, 49 : 49 : 2, 48 : 48 : 4, 47 : 47 : 6 and 46 : 46 : 8. Each treatment was replicated thrice. Parameters observed were the nutritional content, sensory acceptance, antioxidant activity and glycemic index (GI) of the cookies. The data obtained were analysed with ANOVA, continued by LSD test at α=0.05 for treatment showed a significant effect. The result showed that the chemical characteristics of the cookies were 1.46–5.12, 0.23–2.10, 10.67–20.76, 1.20–4.26, 8.36–10.94 and 64.75–74.09% for moisture content, ash, fat, fibre, protein and carbohydrate, respectively. The energy and antioxidant activity (IC₅₀) of the cookies was at the range of 426.31–480.30 kcal/100 g and 151–200 ppm. The most preferred sample was the one with WF : CP : CLF of 49 : 49 : 2 with a GI value of 77.4. This study showed that cassava leaves flour has potential as an alternative ingredient in improving the nutrition profile of cookies production.

Here is the first report of bioethanol production from giant cassava, a variety of cassava originated from East Kalimantan. Hydrolysis on freshly grated cassava with two different acids was studied separately. The experiment was conducted as a single factor experiment in Completely Randomized Design (CRD) with five treatments (0.0–1.0 M of acid solution), each replicated three times. Reducing sugars, unhydrolyzed substance (fibers), and hydrolysate clarity was determined. The experiment was continued by studying fermentation condition using factorial experiment (2 x 4) in CRD. The first factor was starter concentration (Saccharomyces cerevisiae, 5 and 10%) and the second factor was fermentation time (2–11 days). Biomass and alcohol content in fermentate were determined. The data were analyzed by ANOVA, excluding alcohol content that analyzed by the non-parametric statistic. Optimization using regression analysis showed that hydrolysis by HCl was more effective than H2SO4. Hydrolysis solution of 0.58 M HCl gave an optimum reducing sugar in hydrolysate (5.6%), which equivalent to a yield of 28.18%. Starter concentration affected significantly on biomass and alcohol content (p < 0.001) of fermentate, while fermentation time affected significantly only on alcohol content (p < 0.001). Optimum condition of cassava hydrolysate fermentation (100 mL) was using 5% yeast for 8 days, which gave a yield of 14.17% bioethanol.

Background: Work fatigue plays a large role in all industries in terms of performance, work safety, and work productivity. Oil and gas is an industry with a high level of occupational safety and health risks. Research of work-related fatigue is needed to detect critical risk factors early in order to prevent the adverse effect of work-related fatigue. Objectives: This study aims to analyze the prevalence of work fatigue in oil refinery workers at one of the oil refinery companies in Indonesia, and analyze the factors that influence it. Design and Methods: A cross-sectional study was conducted on 224 oil refinery workers. Questionnaire and work-related fatigue scales were used to assess demographic characteristics and work-related fatigue. A medical examination was applied to assess the health status of workers based on blood pressure, body temperature, and respiratory rate. The sound level meter and heat stress meter was used to measure noise and work climate. Cramer’s V correlation was applied to identify correlations between work-related fatigue and other parameters. Results: Work-related fatigue of 100% was found among workers, with categorized as low, medium, high, and very high in 9.38, 53.57, 30.35, and 6.7% of the workers, respectively. Work-related fatigue was significantly correlated with working period (p=0.028), health status (respiratory rate) (p=0.018), noise exposure (p=0.000) and work climate/heat stress (p=0.001). Conclusion: The companies should improve the health status of workers, reduce workload for aging workers, control noise, and control heat exposure in the workplace.

The learning model is one of the critical factors in boosting student to have good learning motivation (LM) and cognitive competencies (CC). In two academic years (2016-2017), only 19.6% of Senior High School (SHS) students in Samarinda passed minimal competence in Biology subject. This research was conducted to find out a better learning model in Biology subject to replace the conventional learning (CL) model. A quasi-experiment using three learning models, i.e. Problem Posing (PP), Problem-based Learning (PBL), and CL, were conducted in all three 11th grade student classes at Public Islamic SHS (PISHS) I Samarinda in the period of odd semester of 2018/2019 academic year. The LM and CC data were collected by questionnaires, each has 40 and 9 problems, respectively. The LM and CC data were analyzed by ANOVA and ANCOVA continued by comparison test using Bonferroni test (p< 0.05), respectively. The results showed that the CL model could increase the CC, but not improve LM. However, PP and PBL model were significantly more effective (p< 0.05) in increasing both the CC and LM. The PP is superior in improving the LM, while the PBL is superior in gaining the cognitive competence.