Natural Science: Journal of Science and Technology <p><strong>Natural Sciences: Jurnal of Science and Technology</strong> [eISSN : 2541-1969 | pISSN : 2338-0950] is an open access journal from Tadulako University, Indonesia. Any paper reporting scientifically accurate and valuable research, which adheres to accepted ethical publishing standards, will be considered for publication. Natural Sciences: Journal of Science and Technology accepts papers in the fields of Mathematics, Statistics, Physics, Biology, Chemistry and Pharmacy. Our growing team of dedicated section editors, handle your paper and manage the publication process end-to-end, giving your research the editorial support it deserves.</p> <p><strong>Natural Sciences: Journal of Science and Technology</strong> <span class="fontstyle0">officially published three times a year. But, starting on January 1, 2021 Journal of Science and Technology will be published twice a year</span> <br style="font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;"><br></p> Faculty of Science, Tadulako University, Sulawesi, Indonesia. en-US Natural Science: Journal of Science and Technology 2338-0950 Authors who publish with this journal agree to the following terms:<br /> <br /><ol type="a"><ol type="a"><li>Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a <a href="" target="_new">Creative Commons Attribution License</a> that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.</li></ol></ol><br /><ol type="a"><ol type="a"><li>Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.</li></ol></ol><br /><ol type="a"><li>Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See <a href="" target="_new">The Effect of Open Access</a>).</li></ol> Potential Study on Soil Arthropods Diversity as Vegetation Bioindicators at Puthuk Siwur and Mount Pundak Hiking Trails District of Mojokerto <p>Puthuk Siwur and Mount Pundak located at Mojokerto Region. Soil athropods having important role on ecosystem including the vegetations. This study was aimed for understand the potential of soil arthropods diversity as an vegetation bioindicators. Based on the results some family having potential to correlate with the vegetations on its habitat. Formicidae Family having potential as predators at a location that some of the vegetation producing fruits. Staphinilidae Family having potential for correlated with vegetation that produce leaf debris on high amount. Entomobrydae family having potential for correlated with decomposing activity of dying vegetation bodies at high altitude.</p> Muhibbuddin Abdillah Muhammad Saiful Anwar Copyright (c) 2020 Natural Science: Journal of Science and Technology 2020-04-30 2020-04-30 9 1 1 — 5 1 — 5 10.22487/25411969.2020.v9.i1.15034 Weed Plant in Cacao and Clove Plantations in Lakatan Village, Tolitoli Regency, Central Sulawesi <p>Diversity of weeds in Cacao plantations and Clove plantations at Lakatan Village, Tolitoli Regency, Central Sulawesi was conducted in May to August 2019. The method used is a double plot method with 16 plots and divided into two parts, 8 plots on cacao plantations and 8 plots on clove plantations randomly placed. Each type of weed contained in the plot was recorded and collected for the manufacture of herbarium specimens, identification was carried out at the Plant Biosystematics Laboratory, Department of Biology, Faculty of Mathematics and Natural Sciences, Tadulako University. The results showed 17 families with 29 species of weed in both plantation areas, 21 species in cacao plantations and 23 species in clove plantations. Families that are often found in both&nbsp; are Asteraceae and Poaceae.</p> Moh Iqbal Hairil Hairil Copyright (c) 2020 Natural Science: Journal of Science and Technology 2020-04-30 2020-04-30 9 1 6 — 10 6 — 10 10.22487/25411969.2020.v9.i1.15037 Spatial Logistic Regression Modeling with Inverse Weighting Distance for open unemployment in Districts/Cities on the Island of Sulawesi <p>Unemployment is a condition where a person does not have a job, but is looking for a job. To see the unemployment situation in an area, logistic regression analysis can be used. Logistic regression is an analysis used to see the relationship between the response variable (Y) which is binary and the explanatory variable (X) which is categorical or continuous. The application of logistic regression often has a spatial influence on the model. In this study to model the open unemployment rate the spatial logistic regression method is used. Spatial logistic regression is logistic regression analysis by incorporating spatial influences into the model. Spatial dependency testing is used by Moran’s I Test. The weighting matrix used is the distance inverse weighting matrix. The results obtained, the value of Moran's I Test with a p-value of 2.14 x 10-12 &lt;α (0.05), meaning that there is a spatial influence on the level of open unemployment on the island of Sulawesi. So the spatial logistic regression model is obtained as follows :<em>g(x)&nbsp;&nbsp;&nbsp; </em>= 4,848 0,000002885(X<sub>1</sub>) 0,0473(X<sub>2</sub>) 0,006669(X<sub>3</sub>) 0,04263(X<sub>4</sub>) 0,269(X<sub>5</sub>) 0,1642(X<sub>6</sub>) 1,531(X<sub>7</sub>) 0,1581(X<sub>8</sub>) 0,2208(X<sub>9</sub>) 0,009732(X<sub>10</sub>) 0,01871(Z). Spatial factors affect the level of open unemployment based on the significance value &lt;α (0.05)</p> Broklyn Pippo Marchegiani Baebae Nur’eni Nur’eni Iman Setiawan Copyright (c) 2020 Natural Science: Journal of Science and Technology 2020-04-30 2020-04-30 9 1 11 — 16 11 — 16 10.22487/25411969.2020.v9.i1.15040 Molecular Diagnosis of Schistosomiasis in Feces Samples From Napu Valley Community of Poso Regency, Central Sulawesi, Indonesia <p>Schistosomiasis is infection caused by Schistosoma worms. Schistosomiasis in Indonesia caused by a worm of <em>Schistosoma japonicum</em>, which is an endemic disease and it is only found in Central selawesi, in high land of Napu Valley, Lindu, and Bada villages. Prevalence of schistosomiasis during 2001-2010 experienced fluctuation, which the lowest prevalence was in 2003, it was 0.70%, and the highest prevalence was in 2010, it was 5.68%. In 2012, the proportion of schistosomiasis case in Napu was 1.44%. From 15 Sub-districts examined in Napu Highland area, there were 12 sub-districts which had the prevalence above the WHO standard of 1%. Routine inspection was conducted by the Department of Health-Central Sulawesi microscopically based on Kato-Katz method. Target of this study is to find out comparation accuration data resulted from molecular examination by PCR method, compare to the results of microscopic examination based on Kato-Katz method. This research was an observational descriptive research. Molecular examination by PCR method was done using primers sequencing of forward 5’-TCT AAT GCT ATT GGT TTG AGT-3’ and reverse 5’-TTC CTT ATT TTC ACA AGG TGA-3’. The target umplification was DNA of SjR2 gene, at 230 bp band. Preserved feces samples was done using ethanol 96% at Dodolo village, that have been previously examined microscopically using Kato-Katz method. Based on microscopic examination on 70 samples, 19 sample was positive infected by the worm of <em>S japonicum</em>, and 51 sample of them was&nbsp; shown negative result. Upon further investigation molecularly by PCR, there were 40 people positively detected for infection by the worm <em>S</em><em>. japonicum</em>, which was shown by appearing on the target band of 230 bp, while 30 others samples were declared negatively. Molecular examination data showed two times more likely in detecting schistosomiasis, compared to microscopic examination by the Kato-Katz method. Our data also showed that Molecular examination using PCR method can be used for 70-96% ethanol-preserved facel samples.</p> Nur Indang Copyright (c) 2020 Natural Science: Journal of Science and Technology 2020-04-30 2020-04-30 9 1 17 — 22 17 — 22 10.22487/25411969.2020.v9.i1.15018 Process of Activated Carbon form Coconut Shells Through Chemical Activation <p>Carbon or charcoal can be made from biomass or cellulose-containing materials such as coconut shells or candlenut shells using a thermal process. One of the thermal process is pyrolysis, which in this process, the material is converted to carbon. The results of pyrolysis are in the form of three types of products namely solids (charcoal / carbon), gas (fuel gas) and liquid (bio-oil). Other products are gases such as carbon dioxide (CO<sub>2</sub>), methane (CH<sub>4</sub>) and some gases that have small contents. In general, the pyrolysis process takes place at temperatures above 300 ° C within 4-7 hours. Carbonized carbon or pyrolysis does not have a large adsorption capacity because the pore structure does not develop, so it is need activation process. One way to activate carbon is chemical activation. There is a need to know the best material for activating carbon through chemical process. This article aims to discuss the advantages and disadvantages of various types of chemical activation and to determine the promising chemical for activation. From various methods of chemical activation, the activator that promises to make activated carbon is Phosphoric Acid (H<sub>3</sub>PO<sub>4</sub>) because it can produce activated carbon which has a maximum micropore at operating conditions &lt;450<sup>o</sup>C with a weight percent ratio between activator and sample around 29 - 52%.</p> Erwan Adi Saputro Varadilla Dwi Retno Wulan Bellani Yunfa Winata Rachmad Ramadhan Yogaswara Nove Kartika Erliyanti Copyright (c) 2020 Natural Science: Journal of Science and Technology 2020-04-30 2020-04-30 9 1 23 — 28 23 — 28 10.22487/25411969.2020.v9.i1.15042