Journal of Mathematical and Fundamental Sciences <p><img class="imgdesc" src="" alt="" width="173" height="220" /></p> <p style="text-align: justify;"><em>Journal of Mathematical and Fundamental Sciences </em>welcomes full research articles in the area of Mathematics and Natural Sciences from the following subject areas: Astronomy, Chemistry, Earth Sciences (Geodesy, Geology, Geophysics, Oceanography, Meteorology), Life Sciences (Agriculture, Biochemistry, Biology, Health, Medical, Pharmacy), Mathematics, Physics, and Statistics. New submissions of mathematics articles starting in January 2020 are required to focus on applied mathematics with real relevance to the field of natural sciences.</p> <p style="text-align: justify;">Starting from Vol. 1, No. 1, 1961, full articles published are available online at ITB Journals and indexed by <a href=";origin=recordpage">Scopus</a>, <a href=";ISSN=2337-5760">Web of Science (Emerging Sources Citation Index) - Clarivate Analytics</a>, <a href=";tip=sid&amp;clean=0">Scimago JR</a>, <a href="">Directory of Open Access Journals (DOAJ)</a>, <a href=";user=xdqQsgUAAAAJ&amp;view_op=list_works&amp;sortby=pubdate">Google Scholar</a>, <a href=",p24780956,3.html">Index Copernicus</a>, <a href=";colors=7&amp;lang=en&amp;jq_type1=QS&amp;jq_term1=journal+of+mathematical+and+fundamental+sciences">The Elektronische Zeitschriftenbibliothek (EZB) by University Library of Regensburg</a>, <a href=";Find=Journal+of+Mathematical+fundamental+Sciences&amp;GetResourcesBy=QuickSearch&amp;resourceTypeName=allTitles&amp;resourceType=&amp;radioButtonChanged=">EBSCO Open Science Directory</a>, <a href="">ASEAN Citation Index</a>, <a href="">Garba Rujukan Digital (Garuda)</a> and <a href="">Science and Technology Index (SINTA)</a>.</p> <p style="text-align: justify;">The journal has been also accredited for five years based on The Decree of Directorate General of Research and Development Strengthening, Ministry of Research, Technology and Higher Education of the Republic of Indonesia <a href="">No. 030/E/KPT/2018</a>, dated on October 24th, 2018.</p> <p style="text-align: justify;">Published by Institute for Research and Community Services, Institut Teknologi Bandung, in collaboration with <a href="">Indonesian Chemical Society (Himpunan Kimia Indonesia - HKI)</a>.</p> <p>ISSN: 2337-5760; E-ISSN: 2338-5510</p> <p><strong><u>Publication History</u></strong></p> <p><strong>Formerly known as:</strong></p> <ul> <li>ITB Journal of Science (2008 - 2012)</li> <li>Proceedings ITB Science and Technology (2003 - 2007)</li> <li>Proceedings ITB (1961 - 2002)</li> </ul> <p>Back issues also can be read online at</p> <p><a title="SCImago Journal &amp; Country Rank" href=";tip=sid&amp;exact=no"><img src=";title=true" alt="SCImago Journal &amp; Country Rank" border="0" /></a></p> Institute for Research and Community Services (LPPM) ITB en-US Journal of Mathematical and Fundamental Sciences 2337-5760 Mathematical Analysis of Two Strains Covid-19 Disease Using SEIR Model <p>The biggest public health problem facing the whole world today is the COVID-19 pandemic. From the time COVID-19 came into the limelight, people have been losing their loved ones and relatives as a direct result of this disease. Here, we present a six-compartment epidemiological model that is deterministic in nature for the emergence and spread of two strains of the COVID-19 disease in a given community, with quarantine and recovery due to treatment. Employing the stability theory of differential equations, the model was qualitatively analyzed. We derived the basic reproduction number for both strains and investigated the sensitivity index of the parameters. In addition to this, we probed the global stability of the disease-free equilibrium. The disease-free equilibrium was revealed to be globally stable, provided and the model exhibited forward bifurcation. A numerical simulation was performed, and pertinent results are displayed graphically and discussed.</p> Adetayo Samuel Eegunjobi Oluwole Daniel MAKINDE Copyright (c) 2022 Journal of Mathematical and Fundamental Sciences 2022-12-28 2022-12-28 54 2 211 232 10.5614/ Oxygen Reduction Reaction Mechanism on the Square Paddle-Wheel Cage Site of TM-BTC (TM=Mn, Fe, Cu) Metal-Organic Framework <p>Our study examined the mechanism of oxygen reduction reactions (ORR) at the square paddle-wheel cage active site of TM-BTC metal-organic frameworks (MOFs), where TM is a transition metal, Mn, Fe, or Cu. We used a combination of density functional theory (DFT) and microkinetic calculations to investigate this mechanism. By using a small cluster for modeling the TM-BTC active site structure, we successfully reproduced the experimental trend of ORR activity in the TM-BTC systems: Mn-BTC &gt; Fe-BTC &gt; Cu-BTC. We also found that the unusual ORR activity trend in experiments for Mn and Fe systems originates from the strength of OH adsorption on these systems. The Mn-BTC system exhibits higher ORR activity than the Fe-BTC system due to its weaker adsorption of OH groups. A very strong OH adsorption makes the final OH reduction step sluggish, hence hindering the ORR process.</p> Ahmad Nuruddin Adhitya Gandaryus Saputro Syauqi Abdurrahman Abrori Arifin Luthfi Maulana Virgiawan Listanto Rahagung Mohammad Kemal Agusta Fadjar Fathurrahman Amrina Mustaqim Hermawan Kresno Dipojono Copyright (c) 2022 Journal of Mathematical and Fundamental Sciences 2022-12-28 2022-12-28 54 2 233 248 10.5614/ Antibacterial Activity of Gyrinops versteegii Fruit Extracts against Staphylococcus aureus and Escherichia coli and GC-MS Analysis <p><em>Gyrinops versteegii</em> is widely used in the perfume, incense, and cosmetic industries as a raw material. Other potential uses of the plant are being explored, including in food and medicine. Therefore, this study carried out antibacterial assay and gas chromatography-mass spectroscopy of <em>G. versteegii</em> fruit extracts in three solvents with different polarities, i.e., <em>n</em>-hexane, dichloromethane, and methanol. The agar well diffusion method was then used to test the extracts against <em>Staphylococcus</em> <em>aureus</em> and <em>Escherichia coli</em>. The dichloromethane extract showed the most effective antibacterial activity against <em>S. aureus</em> at a concentration of 40%, with a zone of inhibition of 13.17 mm compared to <em>E. coli</em>, for which it was 7 mm. Furthermore, the bacterial species showed different responses to the extracts. Total and partial inhibition was shown by the <em>G. versteegii</em> fruit extracts against <em>S.</em> <em>aureus</em> and <em>E. coli</em>, respectively. Furthermore, GC-MS identified the following compounds in <em>G. versteegii</em> fruit extract: palmitic, oleic, and stearic acid, as well as bis-(2-ethylhexyl) phthalate, 2,3-dihydro-3,5-dihydroxy-6-methyl-4H-pyran-4-one, methyl octadec-9-enoate, squalene, and 2-monopalmitin derivates. The results showed antibacterial potency of <em>G. versteegii</em> fruit extract against pathogenic bacteria. Additionally, the antibacterial activity of the extract was stronger against <em>S.</em> <em>aureus</em> compared to <em>E. coli</em>.</p> Ernin Hidayati Yuli Handayani I Made Sudarma Copyright (c) 2023 Journal of Mathematical and Fundamental Sciences 2023-03-04 2023-03-04 54 2 249 260 10.5614/ Synthesis, Structure, Magnetic and Antibacterial Properties of polymeric [M(Quin)2(N(CN)2)2]∞ (M = Mn(II), Co(II); Quin = quinoline) <p>Two complexes of [Mn(Quin)<sub>2</sub>(N(CN)<sub>2</sub>)<sub>2</sub>]<sub>∞</sub> (<strong>1</strong>) and [Co(Quin)<sub>2</sub>(N(CN)<sub>2</sub>)<sub>2</sub>]<sub>∞</sub> (<strong>2</strong>) were synthesized and characterized. The as-synthesized complexes crystallized in a triclinic lattice with a space group of P-1. The unit cell parameter of <strong>1</strong> was <em>a</em> = 7.5207(14) Å, <em>b</em> = 7.7729(16) Å, <em>c</em> = 9.5968(15) Å, <em>α</em> = 96.388(6)<sup> o</sup>, <em>β</em> = 112.617(5)<sup> o</sup>, <em>γ</em> = 102.751(6)<sup> o</sup>, while for complex <strong>2</strong> it was <em>a</em> = 7.3942(10) Å, <em>b</em> = 7.7960(10) Å, <em>c</em> = 9.4907(13) Å, <em>α</em> = 96.631(4)<sup> o</sup>, <em>β</em> = 112.742(4)<sup> o</sup>, <em>γ</em> = 102.458(4)<sup> o</sup>. The magnetic properties and antimicrobial properties of both polymeric complexes were examined by magnetic susceptibility and diffusion techniques, respectively. Complexes <strong>1</strong> and <strong>2</strong> both showed antiferromagnetic properties and had a higher inhibitory effect on the growth of <em>Staphylococcus aureus</em> than <em>Salmonella typhi</em>.</p> I Wayan Dasna Ubed Sonai Fahruddin Arrozi Husni Wahyu Wijaya Sutandyo Dwija Laksmana Stéphane Golhen Copyright (c) 2023 Journal of Mathematical and Fundamental Sciences 2023-03-19 2023-03-19 54 2 261 274 10.5614/