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All Journal Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Pijar MIPA International Journal of Contextual Science Education
Kusmiyati Kusmiyati
University of Mataram
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Education Materials Science & Nanotechnology Mathematics Physics Other

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Analysis of heavy metal content of cadmium (Cd) in milkfish (Chanos chanos Forsk) from milkfish farms in Bima Bay Bukhari Muslim; Khairuddin Khairuddin; M. Yamin; Kusmiyati Kusmiyati
Jurnal Pijar Mipa Vol. 17 No. 1 (2022): January 2022
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (179.662 KB) | DOI: 10.29303/jpm.v17i1.3122

Abstract

The research aims to analysis of the content of heavy metals cadmium (Cd) in milkfish (Chanos chanos Forsk) from the encroachment of Bima bay at year 2020. The benefit of this study is to provide information related to the content of heavy metals cadmium (Cd) in milkfish (Chanos chanos Forsk) and protect the community or consumers from heavy metal contaminants. The research was conducted in Bima Bay, namely in 2 research locations, namely Malay village, Bima City, and Palibelo, Bima Regency. This type of research is descriptive explorative research—sampling techniques using purposive sampling. Samples of milkfish were taken directly on the pond area of 3 heads in each location. Then the sample is put in the sample box that has previously been washed clean. The research samples were then analyzed of the content of heavy metal cadmium (Cd) using Atomic Absorption Spectrophotometer tool. The results showed that at the palibelo research site, Bima Regency in PB 1 samples contains cadmium (Cd) of 30 ppm, PB 2 samples of 40 ppm, and PB 3 samples of 10 ppm. Furthermore, at the location of Malay village, Bima City on KM 1 sample of 30 ppm, on KM 2 sample of 40 ppm, and KM 3 sample of 20 ppm. The content of heavy metal cadmium (Cd) in milkfish (Chanos chanos forsk) from Bima Bay exceeds the threshold by BPOM Regulation No. 5 of 2018 is 0.1 ppm. The presence of heavy metal content cadmium (Cd) that exceeds this threshold indicates that the waters of Bima Bay have been contaminated by heavy metals Cadmium (Cd).
Powerful Lipolytic Activity of Fungi Isolated from Coconut and Avocado Flesh on Different pH and Temperature Prapti Sedijani; Dewa Ayu Citra Rasmi; Kusmiyati Kusmiyati; Riska Agustina Anggriani
Jurnal Penelitian Pendidikan IPA Vol 7 No SpecialIssue (2021): December
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v7iSpecialIssue.1261

Abstract

Lipase is widely applied in various fields of industries elevating its economic value. The demand for lipase keeps increasing open up working opportunities. Isolates showing lipolytic activity obtained previously are tested for their activity on different pH mediums: 7, 8, 9, and 10; and at different temperatures. The fungi are grown on SDA medium supplemented with Olive Oil, emulsifier, Tween 80, and Rhodamine B. The experiment was made in 3 replicates and is incubated at room temperature of 30oC. Lipase activity was calculated based on the clear zone around colonies observed on day 2 and day 3 after inoculation. The result shows that those isolates are highly active on various pH at RT, and the activity slightly reduces at 30oC. This result suggests that a wide range of their applications are at room temperature when pH is a limiting factor for the applications
Mozambique Tilapia Fish from Taliwang Lake as Bioindicator to Determine Lead Heavy Metal in 2022 Era Meizaton Elfiza; Khairuddin Khairuddin; Kusmiyati Kusmiyati
Jurnal Penelitian Pendidikan IPA Vol 9 No 3 (2023): March
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i3.4135

Abstract

This study aims to determine the content of the heavy metal Lead (Pb) inmozambiqutilapia fish fromRawa Taliwag Lake and to find out whetermozambiqutilapia fish as a bioindicator originating from Rawa Taliwang Lake is suitable for consumption in accordance with The Indonesian Food and Drug Authority regulations Number 9 of 2022 concerning Requirements for Heavy Metal Contamination in Processed Foods. This research is a quantitative descriptive research. Sampling was carried out using purposive sampling method. The number of samples taken as many as 4 tails. The part taken is mozambiqutilapia fish meat which will then be analyzed using the Atomic Absorption Spectrophotometry (AAS) method. Sample analysis was carried out at the Analysis Laboratory of the Faculty of Mathematics and Natural Sciences, University of Mataram and the Environmental Laboratory Center for the Environment and Forestry Office of West Nusa Tenggara Province. This research took place from August 2022-March 2023. The results showed that the heavy metal content of Lead in the bodies of Lake fish from Rawa Taliwang Lake ranged from 0.197 mg/kg to 0.199 mg/kg so that an average of 0.197 mg/kg was obtained. Tilapia fish from Rawa Taliwang Lake is still below the threshold so it is still safe for consumption
Strengthening Pancasila Student Competencies through a Mini Hydropower Project in Science Education to Support Sustainable Development Goals (SDGs) Hikmawati Hikmawati; Muntari Muntari; Kusmiyati Kusmiyati; Irman Muliadi; Rohani Rohani; Ira Sulhiyati
International Journal of Contextual Science Education Vol. 4 No. 2 (2026): April - June 2026 (In Press)
Publisher : Postgraduate Program, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ijcse.v4i2.1574

Abstract

Strengthening students’ competencies, including critical thinking and creativity, is an essential part of implementing the Pancasila Student Profile within the Merdeka Curriculum. One instructional approach that can support the development of these competencies is Project-Based Learning (PjBL). This study aims to analyze the effect of implementing Project-Based Learning through a mini hydropower model project on students’ critical thinking and creativity in science learning on renewable energy topics. The study employed a quantitative approach with a quasi-experimental design of the non-equivalent control group type. The research was conducted in the odd semester of 2025 with ninth-grade students at a junior high school in Mataram City. The sample consisted of two classes, namely an experimental class of 31 students and a control class of 29 students. The research instrument was an essay test consisting of 10 items, including 5 items to measure critical thinking and 5 items to measure creativity. The data were analyzed using descriptive statistics and one-way MANOVA. The results showed that the mean scores of students’ critical thinking and creativity in the experimental class were higher than those in the control class. The MANOVA results indicated a significance value of less than 0.05, demonstrating that the implementation of Project-Based Learning through the mini hydropower project had a significant effect on students’ critical thinking and creativity. Project-based learning in renewable energy topics not only enhances higher-order thinking skills but also supports the strengthening of Pancasila Student competencies and is relevant to achieving the Sustainable Development Goals, particularly in quality education and clean, sustainable energy.
Co-Authors Bukhari Muslim Dewa Ayu Citra Rasmi Era Meizaton Elfiza Hikmawati Hikmawati Ira Sulhiyati Irman Muliadi Khairuddin Khairuddin M. Yamin Muntari Muntari Prapti Sedijani Riska Agustina Anggriani Rohani Rohani