17-β Estradiol (E2), estrone (E1), and testosterone (T) are steroid hormones formed naturally by humans and animals or derived from synthetic sources. These steroid hormones are frequently used in aquaculture farms to increase production and treat diseases. However, there are concerns about the presence...

Ionic liquids and volatile organic solvents are both intended to be replaced with deep eutectic solvents (DES) in industrial and laboratory procedures. Low cost, simple manufacturing, biodegradability, strong solubilization strength, and low toxicity are a few advantages of using DES. One of the most...

Lipases are a group of hydrolase enzymes that play an important role in industry and biotechnology. In addition, lipase has the ability as a catalyst in ester hydrolysis, transesterifications, alcoholysis, and acydolysis reactions. This study aims to obtains the character of the tolerant lipase of organic...

Performance of the electroflotation process is strongly influenced by the size and number of the hydrogen and oxygen gas bubbles that form during the electrolysis of water. In this study, the analysis of the size distribution of gas bubbles by the segmentation of the electrode surface was evaluated....

The coagulation treatment was applied to the synthetic peat water using Sesbania grandiflora seed. One of the factors to enhance coagulation is rapid and slow mixing. Rapid mixing is crucial to promote the interaction of coagulant with suspended particles and the formation of micro flocs. While slow...

This research investigates the use of 1-5diphenylthyocarbazone in the analysis of heavy metals Cu, Pb, Zn, Mn, and Ni in seawater samples collected from Alas Strait Waters. The aim of this research is to find out the optimum conditions in analyzing heavy metals, such as optimum pH, extraction time, recovery...

Human haircut waste (HHW) is categorized as waste that is difficult to decompose by microorganisms in water and soil and has high stability to temperature. HHW disposal carelessly will cause environmental pollution problems. Incineration of HHW produces gas with a pungent odor that can interfere with...

Synthesis of calix[4]resorcinarene derivatives and their activity as an antioxidant has been carried out. The calix[4]resorcinarene was synthesized through a condensation reaction of resorcinol, valeraldehyde, and benzaldehyde using HCl as a catalyst with ethanol as a solvent (73 ℃, 24 h). Two synthesized...

A theoretical study of alkaline earth extraction using 12-crown-4 derivative has been carried out. The capability of the crown ether derivative to extract alkaline metal cations (Li+, Na+, K+) is studied by Density Functional Theory (DFT) Method. The DFT calculations uses 6-311G(dp) basis set at the...

A theoretical study of alkaline earth extraction using a 15-crown-5 derivative has been carried out. The selectivity of the crown ether derivatives to extract alkaline earth metal cations (Be2+, Mg2+, Ca2+) is studied by Density Functional Theory (DFT). The DFT calculations use 6-31G(d) and LANL2DZ basis...

This research investigates the synthesis and characterization of La-NDC/La-BDC MOF using FTIR, XRD, SEM, and the electronic response of those MOFs to metal ions and oxoanions at the UV-Vis range. This research was conducted in February-June 2022 at the Laboratory of Basic Science, Faculty of Education...

The high consumption of fresh fruit encourages the development of studies on safe food coatings, such as hydrocolloid-based edible coatings. In this study, a complex polyelectrolyte based on chitosan (chi) was synthesized and applied as a coating for fresh pineapple. As a cationic polymer, chitosan interacts...

Sukarara Village is a woven fabric tourism village on Lombok Island with featured songket and ikat weaving products. Natural dyes in woven fabrics are popular because they are more environmentally friendly, and the colours are more natural than synthetic dyes. However, natural dyes fade quickly, colour...

In South Asia, the prevalence of health problems is increasing day by day. Over 11.9% of the 167.85 million people in Bangladesh live in poverty with no safety net. Moreover, communicable diseases (vaccine-preventable diseases, tuberculosis, malaria, HIV/AIDS, and neglected tropical disease) and non-communicable...

Background: The antioxidant is a nutrient that is needed to encounter free radicals produced by internal metabolism and also from the environment. In artisanal small-scale gold mining areas, environmental pollution, particularly mercury, could be the source of the free radical agents. Besides pollution,...

The purpose of this study is to describe the application of the ethnopedagogy approach in chemistry learning as an effort to strengthen the cultural identity of students. This qualitative research involved 122 students of eleventh grade at SMAN 1 and SMAN 2 Pujut, Central Lombok. The cultural identity...

This study aims to analyze the application of STEM (Science, Technology, Engineering and Mathematics) with an ethnoscience approach to chemistry learning in West Nusa Tenggara (NTB). It is qualitative research using a questionnaire technique to assist in obtaining relevant information. The total sample...

To be able to design optimal laboratory activities at the university, it is necessary to first carry out an assessment of the profile of laboratory activities that have been conducted by students. This study aims to analyze the laboratory activity profile of chemistry students in pre-lab, lab work, and...

The purpose of this study was to develop online learning based on augmented reality (AR) technology related to environmental pollution and its effect on the mental model of students of the Chemistry Education Study Program, FKIP University of Mataram. The results of this study are expected as a first...

Chemistry learning is characterized by the study at the submicroscopic level, which includes structure, dynamics, and particle transformation, such as atoms, ions, and molecules. In addition, chemical concepts tend to be related to one another, making it difficult for students to understand. Metacognitive...