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Jurnal Pijar MIPA
Published by Universitas Mataram
ISSN : 19071744     EISSN : 24601500     DOI : -
Core Subject : Science, Education,
Biochemistry, Genetics & Molecular Biology Chemistry Mathematics Physics
Jurnal Pijar MIPA (e-ISSN: 2460-1500 & p-ISSN: 1907-1744) is an open-access scientific periodical journal published by the Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA publishes original articles on current issues and trends in mathematics-science-science education studies. In addition, this journal addresses issues concerning environmental education and environmental science. The journal scopes are: a. Physics and Physics Education b. Chemistry and Chemistry Education c. Biology and Biology Education d. Natural Science and Science Education e. Mathematics and Mathematics Education f. Environmental and Environmental Education
Arjuna Subject : Umum - Umum
Articles 1,179 Documents
 98   99   100   101   102 
The effect of giving cabbage litter on population growth of the african night crawder earthworm (Eudrilus eugeniae) Melati, Puput; Karnan, Karnan; Merta, I Wayan
Jurnal Pijar Mipa Vol. 18 No. 6 (2023): November 2023
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v18i6.5860

Abstract

Cabbage (Brassica oleracea) is one of the vegetable wastes that is often produced by the Amahami market, Bima City. With its easy-to-wilt nature and high water content, cabbage causes it to rot quickly, which will impact environmental problems. Processing market waste certainly requires sustainable management. One model of waste management is to use it as feed. This research aims to determine the effect of giving cabbage waste on the increase in the population of earthworms (Eudrilus eugeniae). The research was carried out in Bima City, Ule Village, Asakota District, Tolotongga Environment. The type of this research is experimental. The research design was a Completely Randomized Design (CRD) with four treatments and ten replications. The parameter observed was the increase in the number of earthworms, analyzed using One Way Anova and followed by Duncan's Multiple Range Test (DMRT). The results of the research showed that giving cabbage waste (Brassica oleracea) as feed had a significant effect (0.009<0.05) on increasing the population of earthworms (Eudrilus eugeniae). The treatment with the highest results was P1 (50 grams of cabbage), with an average number of worms of 367.30.
Effect of gamal leaves (Gliricidia sepium ) extract against termite (Coptotermes curvignathus) Pratiwi, Baiq Yulia Hasni; Muhsin, Lalu Busyairi
Jurnal Pijar Mipa Vol. 18 No. 6 (2023): November 2023
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v18i6.5863

Abstract

The World Health Organization (WHO) estimates around 3 million people working in the agricultural sector experience insecticide poisoning, and 18 thousand of them die every year. The massive use of synthetic insecticides can harm non-targeted organisms such as plants and livestock. Moreover, this may lead to ecological imbalance and increase pollution. Thus, there is a need for innovation in making natural insecticides. Indonesia is home to abundant plant diversity; one of those is the Gamal plant (Gliricidia sepium). Previous studies found that Gamal leaves contain secondary metabolites such as flavonoids, alkaloids, tannins, saponins, and steroids. Flavonoids are known to have a toxic effect on mealybugs in the papaya plant, and tannins are antimicrobial and often used as pest control. Based on this, the Gamal plant has potential as a natural insecticide. One of the most critical pests in agriculture and households is termites (Coptotermes curvignathus), which often cause losses by damaging plants and household furniture. Also, there is no research yet on Gamal leaves against termites. Therefore, research is necessary to test the effectiveness of Gamal leaf extract against termites. In this study, experimental research was used with a quantitative approach. The Gamal leaf extract was obtained using ethanol and methanol solvents through a maceration technique. Several termites were acclimatized, and 120 were taken randomly for toxicity testing. Four concentrations (10%, 25%, 50%, and 75%) were applied to each group of ten termites. This treatment was repeated three times, and the termite mortality time was measured. Afterwards, the value of LC50 was determined using a regression line between log concentration and probit mortality. The result shows that the higher the concentration, the shorter the termite death time. The mortality rate reaches 100% within 1 to 2 minutes after treatment. The LC50 value of Gamal leaves extract against termites obtained is 5,1%. This indicates that Gamal leaves are very effective in killing termites, even in the lowest concentration. It is likely caused by secondary metabolites, especially flavonoids, that have insecticidal effects. In brief, the ethanolic and methanolic extract of Gamal leaves has the potential to be a natural insecticide to substitute synthetic insecticide, which is safer, economical, and environmentally friendly.
Adsorbent effectiveness of α-cellulose/humatic acid with epichlorohydrin cross-linking agent on methyl orange dye Asri Widyayanti, Oksita; Mohtar, Cici Farhana Ambarwanty; Jaman, Anwar
Jurnal Pijar Mipa Vol. 18 No. 6 (2023): November 2023
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v18i6.5917

Abstract

Adsorption of methyl orange (MO) using epichlorohydrin cross-linked humic acid/cellulose composite has been carried out. This study aims to synthesize epichlorohydrin cross-linked humic acid/cellulose composites, determine the optimum pH, contact time, and initial concentration and study MO desorption. The adsorbent production begins with the isolation of cellulose from empty palm oil bunches (EFB) obtained from North Sumatra and the isolation of humic acid from peat soil obtained from Rawa Pening. Then humic acid was cross-linked to cellulose in an alkaline solution (NaOH), then epichlorohydrin was added as a cross-linking agent while heating at 600C for 2 hours. Epichlorohydrin cross-linked humic acid/cellulose adsorbents (AH/Cell-ECH) were further characterized using FTIR, XRD and SEM spectroscopy. MO solutions before and after adsorption were analyzed using UV-Vis spectrophotometry. MO desorption studies used HCl pH 4, 0.1 and 1.0 M NaCl and 40% and 60% ethanol. FTIR characterization showed that the AH/Sel-ECH adsorbents had active groups, including –OH, -C=O, and –COOH. Characterization using XRD showed diffraction peaks in the 2θ region around 11.41, 20.25, 22.55, and 42.66o, indicating the presence of galactose, xylose, glucose and polysaccharide phases. The SEM-EDX results showed that the surface of the adsorbent had non-uniform pore sizes, and the surface morphology tended to be clean and free of debris. It indicated the presence of C, O, and N elements in AH/ECH-cells and S, N elements after MO adsorption. The optimum interaction of AH/Sel-ECH with MO occurred at pH 2 with 150 mg/L MO, and a contact time of 120 minutes was obtained. MO adsorption by AH/ECH-cells followed a pseudo-second-order kinetics model and the Freundlich isotherm with an MO adsorption capacity of 9.84 x 10-5 mmol/g, respectively. Desorption studies showed that 60% ethanol was the most effective solution for desorption of MO.
Fabrication of Carbon Paste Electrode Modified with Bentonite Nanoparticles and Titanium Dioxide Nanoparticles for Analysis of Methyl Parabens by Cyclic Voltammetry Hizbullah, Ahmad Jihad; Setiarso, Pirim
Jurnal Pijar Mipa Vol. 19 No. 1 (2024): January 2024
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v19i1.5949

Abstract

Cosmetics are products of several substances or ingredients with a predetermined time limit. Efforts to extend the time limit of cosmetic use are made by adding preservatives. One preservative that is often used is methylparaben. Methylparaben has been tested using spectrophotometry, voltammetry, and HPLC. In this study, electrode modification was carried out in the voltammetry test to obtain a low detection limit. The purpose of this study was to determine the effect of the working electrode composition of carbon paste, bentonite nanoparticles, titanium dioxide nanoparticles, and paraffin on the best response in the analysis of methylparaben by cyclic voltammetry, knowing the optimum measurement conditions of pH with the best electrode composition in the analysis of methylparaben by cyclic voltammetry. FTIR characterized bentonite nanoparticles to determine vibrations and functional groups, and XRD was performed to determine the phase and particle size. The electrode was made from a mixture of carbon, bentonite nanoparticles, titanium dioxide nanoparticles, and paraffin. The best electrode composition was added with titanium dioxide nanoparticles to obtain a higher peak current. XRD characterization of bentonite nanoparticles showed an average particle size of 43.8155 nm. The result of determining the best electrode composition is 3:2:3:2 with an anodic peak current of 9.6.10-4 A. The best methylparaben measurement at pH seven solution conditions. The latest research shows that carbon paste electrodes modified with bentonite and titanium dioxide nanoparticles can be used for methylparaben analysis.
Deciphering the student dilemma: The quest for passion and purpose on addmision of tadris biology department a religious higher education institutions Elfianti, Maya; Ferry, Dharma; Damni, Albertos
Jurnal Pijar Mipa Vol. 18 No. 6 (2023): November 2023
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v18i6.5956

Abstract

The primary objective of this study is to scrutinize the underlying factors that inform students' choices when selecting the Tadris Biology major at a Religious Higher Education Institution located in Jambi. The research adopts a qualitative, remarkably grounded theory approach as its methodological framework. The central aim is to comprehensively examine the justifications and rationales that steer students toward their decision to pursue the Tadris Biology major. The research methodology is firmly anchored in qualitative paradigms, and grounded theory provides the overarching structure for this investigation. The data collection technique in this research is by using a questionnaire. Data analysis is systematically carried out through thematic analysis, allowing for extracting key themes and insights. The sample selection process is methodically executed, utilizing the theoretical sampling method. The samples were 98 students registered in the Tadris Biology department at an Islamic college. The research findings collectively underscore the significant influence of Gender-Based Considerations, Parental and Familial Influence, Personal Interest in Biology as a Major Field of Study, an Exploration into the Impact of School Background, and Prospects for Future Careers in steering students' decisions within this academic domain.
Quantitative analysis of borax in sape crackers in Soro Village, Lambu District, Bima Regency Nurhidayah, Nurhidayah; Wahyuningsih, Sri; Nisaatun, Khairatun
Jurnal Pijar Mipa Vol. 18 No. 6 (2023): November 2023
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v18i6.5973

Abstract

Crackers are a popular snack product and have long been known by the people of Indonesia as a complement to meals that are often not left behind; without these snacks, people often feel something is missing in their diet. Manufacturers often misuse sodium tetraborate as white crystals with the chemical formula Na2B4O7. This quantitative research uses an experimental method using four samples of sape crackers. This research aims to determine the sape crackers in Soro village, Lambu subdistrict, Bima regency. Quantitative analysis of borax in the sape cracker sample was 9.67 µg/mL in sample A, 12.17 µg/mL in B sample, 13.89 µg/mL in the C sample, and 62.01 µg/mL in the D sample. This study concludes that the sape crackers produced in Soro Village, Lambu District, Bima Regency, from the four samples studied, were all positive for containing borax. It is hoped that producers can use permitted food additives such as Sodium Tripolyphosphate (STPP).
Domestic waste management planning at PLN (PERSERO) UPK Lombok ULPLTD Paokmotong: 3R progrrm approach Melinda, Tina; Wahyudin, Wahyudin; Juliartha, I Putu Eka
Jurnal Pijar Mipa Vol. 18 No. 6 (2023): November 2023
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v18i6.5974

Abstract

Effective and sustainable domestic waste management is essential for PT PLN (Persero) UPK Lombok ULPLTD Paokmotong. In facing environmental challenges and increasingly stringent regulatory demands, this company needs to carry out domestic waste management planning based on waste generation and composition. This study aimed to determine waste management planning with the 3R program at ULPLTD Paokmotong. The research method in this study is descriptive qualitative with data collection techniques: interview methods, surveys, and measurements of domestic waste generation and composition at PT PLN (Persero) UPK Lombok ULPLTD Paokmotong. The results of this study indicate that TPS 3R at ULPLTD Paokmotong serves 61 employees. Based on the type of waste, the proposed waste management strategy, namely implementing the 3R program at PT PLN (Persero) UPK Lombok ULPLTD Paokmotong, has proven effective in reducing waste generation and optimizing resource use. Through waste reduction efforts at the source, reuse of recyclable materials, and efficient recycling processes, companies can reduce environmental impacts and generate sustainable economic benefits. Based on the planning of waste containers that must be provided by ULPLTD Paokmotong of 3.14 liters, placed in each building and distinguished by the type of waste, namely organic, inorganic, and B3. With an organic waste volume of 18 L / day with a compostable waste capacity of 14.4 L / day. Meanwhile, in implementing the 3R program based on the calculation results, the total volume of composting produced is 540 L / month. The total number of composter drums that must be prepared is seven pieces. As for residual waste, it has a volume of 4 L / day with a container capacity of 28 L and an inorganic waste storage area of 2 m3 with a length of 2 m, width of 1 m, and height of 1 m. The suggestion in this study is that it is hoped that the next researcher will add the Draft Budget for the construction of TPS 3R and the DED of the TPS 3R building.
Chlorine content analysis on white rice at the Pagesangan Market, Mataram City Nurhidayatullah, Nurhidayatullah; Yuliansari, Dini; Fatmalia, Enida
Jurnal Pijar Mipa Vol. 18 No. 6 (2023): November 2023
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v18i6.5976

Abstract

In Indonesia, rice is a staple food consumed daily. The high purchasing power of the public for good quality rice makes this a reason for producers to add dangerous bleaching agents such as chlorine to improve the physical quality of the rice they sell. The use of unclear bleaching agents on rice that do not meet the requirements for permitted additives in food and whose concentrations exceed the threshold limits is dangerous for human health. This research aims to determine the presence of chlorine in white rice sold at the Pagesangan market. The methods used are qualitative and quantitative. Three of the five rice samples tested at the Mataram STTL Laboratory tested positive for chlorine. Chlorine levels in rice samples, sample C, were 367.4 mg/L, sample D was 275.1 mg/L, and sample E was 93.4 mg/L.
Study of Developing Models of Crop Failure Risk Information Agustiarini, Suci; Sampelan, David; Maurits, Yuhanna; Baihaqi, Anas; Patria Megantara, Restu; Ulfah, Afriyas; Permana, Angga; Kirana, Nindya; Sulistio Adi Wibowo, Dewo; Purwaningsih, Ni Made Adi; Pamungkas, Cakra Mahasurya Atmojo; Putrantijo, Nuga; Fajariana, Yuaning
Jurnal Pijar Mipa Vol. 19 No. 1 (2024): January 2024
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v19i1.5981

Abstract

Climate is one factor that can influence plant growth. The risk of crop failure due to climate variability can be in the form of reduced water sources, which impact water needs in the land and the emergence of pests and diseases in plants. The risk of planting failure can impact product quality, which has the potential to decrease, higher plant handling costs, and various things that cause losses to farming businesses. The availability of climate forecast information, such as rainfall and other parameters, encourages writers to apply it to information that is easier for users to understand. One of the machine learning algorithms, Decision Tree, is used as a model in determining the risk of planting failure based on each attribute/parameter, including monthly rain, ENSO and IOD phenomena, drought, groundwater availability, and Oldeman climate type. This study aims to make a model prediction of crop failure risk potential, and the calculation is based on climate prediction data. The results of this study show differences in climatic conditions for each commodity when there is an increased potential risk of planting failure. Monthly rainfall is the most dominant factor influencing rice, maize, and soybean planting failure. Validation of the decision tree model shows that this model is quite good in determining the potential risk of crop failure in all commodities studied, with the proportion of correct proportion of more than 65%. However, the Heidke Skill Score (HSS) shows that this model is good for Paddy and Soybean; Maize shows an HSS of less than zero.
Using pumice as an alternative to reduce biological oxygen demand and chemical oxygen demand in tough waste Sholehah, Hijriati; Abdullah, Taufik; Azwarudin; Aprianti, Sri
Jurnal Pijar Mipa Vol. 18 No. 6 (2023): November 2023
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v18i6.5989

Abstract

The tofu industry is a type of industry that operates in the field of food processing from soybean raw materials. The tofu industry is dominated by small-scale businesses, most integrated into residential areas. The tofu industry has yet to process the liquid waste it produces. High environmental pollution can result in the death of aquatic biota due to lack of oxygen. This research aims to reduce BOD and COD levels that do not meet quality standards. Based on this, research was conducted to reduce the organic content in tofu liquid waste using pumice stone as a filtration medium. The research used a 2.5-inch PVC pipe with a height of 70 cm and a media size of 8 mesh, which was heated at temperatures of 50°C and 100°C. The research results after treatment showed that the initial concentration of BOD levels was 160 mg/L. After going through the filtration process with media heating treatment at 50°C and 100°C, the BOD levels were reduced to 116.8, 76.8, and 40 mg/L, respectively, with 52% and 75% reduction effectiveness. While the initial concentration of COD levels was 326 mg/L, after going through the filtration process with media heating treatment at  50°C and 100°C, the COD levels were reduced to  252 and 198 mg/L, respectively, and the effectiveness of the reduction was 23% and 39%.

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