Eksakta : Berkala Ilmiah Bidang MIPA
Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) is an open access journal and peer-reviewed that publishes either original article or reviews. The journal is dedicated towards dissemination of knowledge related to the advancement in scientific research. The prestigious interdisciplinary editorial board reflects the diversity of subjects covered in this journal. Under the realm of science and technology, the coverage includes environmental science, pure and applied mathematics, agricultural research and engineering, biology, biotechnology, bioinformatics, Healthcare sciences (including clinical medicine, preventive medicine & public health), physics, biophysics, computer science, chemistry and bioengineering, to name a few. This Journal Is Published at 3 Month intervals on January-Marc, April-June, July-September and October-December
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<![CDATA[Statistics Analysis the Effect of DiSTAD Learning Model on the Critical Thinking Skill and Learning Motivation ]]>
<![CDATA[Ana Silfiani Rahmawati]]>;
<![CDATA[Daniel Wolo]]>
<![CDATA[ EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 23 No. 03 (2022): Eksakta: Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) ]]>
Publisher : <![CDATA[Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia ]]>
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DOI: 10.24036/eksakta/vol23-iss03/321
<![CDATA[This study aims to determine the statistical analysis of the influence of the DiSTAD learning model on critical thinking skills, learning motivation, critical thinking skills and learning motivation. Data analysis using descriptive analysis and inferential analysis. The techniques used in data collection are test and non-test. The test technique is used to determine critical thinking skills and non-test techniques (quesioner) are used to determine the learning motivation of students. The results show that DiSTAD learning model gives a significantly positive effect to the critical thinking skills and it is shown by the output value of the t-test (5,529) (significance < 0.05). DiSTAD learning model gives a significantly positive effect to the student learning motivation, and it is shown by the output value of the t-test (5,531) (significance<0.05). The implementation of DiSTAD learning model gives a significantly more positive effect to the critical thinking skills and student learning motivation, and it is shown by the output value of the F-test (34,040) (significance < 0.05).]]>
<![CDATA[Analysis of Update Mapping in Science Learning Media Research: Bibliometric Analysis Based on Google Scholar Data ]]>
<![CDATA[Sigit Subagja]]>;
<![CDATA[Didit Ardianto]]>;
<![CDATA[Bibin Rubini]]>
<![CDATA[ EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 23 No. 03 (2022): Eksakta: Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) ]]>
Publisher : <![CDATA[Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia ]]>
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DOI: 10.24036/eksakta/vol23-iss03/322
<![CDATA[This article presents a review of bibliometric analysis on the topic of science learning media research. The aim of this research is to identify relevant research and the latest research on the research topic being analyzed. The method used in this research is descriptive quantitative with bibliometric data approach. Research data collection is carried out on the Google Scholar page with the help of Publish or Perish (PoP) software using the keyword "science learning media". Search is limited to the 2019-2021 range and the number of search results is limited to 100. Data analysis and visualization using VOSviewer software. The result is the number of article citations is 328 citations with an average of 164 citations/year and 3.64 citations/articles. IOPSCIENCE is the most productive publisher with the highest number of articles, which is 23 articles. Bibliometric visualization of network maps based on text-mining analysis resulted in 24 interconnected words grouped into 4 clusters and network maps based on the authors of the Co-authorsip showed that Alpusari and Hermita were the authors who had the most related with other authors in the topic of science learning media research.]]>
<![CDATA[The Influence of NaOH Activator Concentration on the Synthesis of Activated Carbon from Banana Peel for Pb(II) Adsorption ]]>
<![CDATA[Abdul Hamid]]>;
<![CDATA[Zeni Rahmawati]]>;
<![CDATA[Mohammad Abdullah]]>;
<![CDATA[Tri Esti Purbaningtyas]]>;
<![CDATA[Faizatur Rohmah]]>;
<![CDATA[Ike Dayi Febriana]]>
<![CDATA[ EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 23 No. 03 (2022): Eksakta: Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) ]]>
Publisher : <![CDATA[Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia ]]>
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DOI: 10.24036/eksakta/vol23-iss03/323
<![CDATA[Lead has been known as one of the heavy metals with a high adverse effect to the environment and human health. This study reports the activity of activated carbon from biomass of banana peel as an adsorbent to resolve the hazardous lead-contaminated wastewater. The influence of the activator was studied via the alteration of NaOH concentration from 1, 3, and 5 M, where the sample was denoted as AC-1, AC-3, and AC-5. Some techniques, including FTIR, XRD, and SEM were applied to characterize the sample with the highest adsorption capacity. FTIR result affirmed the presence of hydroxyl group on the activated carbon with NaOH 1 M (AC-1) that was beneficial for adsorption. XRD and SEM confirmed that the activated carbon possessed crystalline and amorphous phases with sheet-like morphology. Regarding Pb(II) adsorption, the higher concentration of activator caused the decline of adsorption capacity as the contact time prolonged. The highest adsorption capacity and efficiency were obtained using 1 M NaOH activator with a contact time of 1 hour, which was 3.71 mg/gram and 97.86%, respectively.]]>
<![CDATA[Diversity of the Starch Granule Morphology of Several Types Cassava (Minihot esculenta Crantz) ]]>
<![CDATA[Via Susana Gusni]]>;
<![CDATA[Moralita Chatri]]>;
<![CDATA[Des M]]>;
<![CDATA[Afifa Akhyar]]>;
<![CDATA[N.Sri Hartati]]>;
<![CDATA[Hani Fitriani]]>;
<![CDATA[Nanang Taryana]]>
<![CDATA[ EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 23 No. 03 (2022): Eksakta: Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) ]]>
Publisher : <![CDATA[Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia ]]>
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DOI: 10.24036/eksakta/vol23-iss03/324
<![CDATA[Cassava (Manihot esculenta Crantz), which is commonly called singkong is multipurpose crop that can be processed as food, feed and other cassava-based bioproduct. Potential application of cassava starch is determined by the properties of starch as the main component of cassava tuber biomass. The size of the cassava starch granules is different for each variety due to genetic and the environment factors in which it grows. The size of the starch granules affects the application of the starch. This study aimed to determine the shape and diameter of the starch granule in several types of cassava through microscopic analysis. The shape and the size of the 62 starch samples tested was varied. The starch granules shape was dominated by spheres form. The diameter of cassava starch granules ranged from 2.016 ± 0.015 µm – 3.318 ± 0.045 µm. The highest diameter was Tidung1.2 and the lowest was Tidung 2.2.]]>
<![CDATA[Development and Validation of RP-HPLC Analysis Method for Determination of Total Alkaloid Content of Soursop (Annona muricata L.) Leaf Extract ]]>
<![CDATA[Lindawati Setyaningrum]]>;
<![CDATA[Dyah Purwaningtyas]]>;
<![CDATA[Ayik Rosita Puspaningtyas]]>;
<![CDATA[Dyan Wigati]]>;
<![CDATA[Mohammad Rofik Usman]]>;
<![CDATA[Maasyitoh Sari Latifah]]>
<![CDATA[ EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 23 No. 03 (2022): Eksakta: Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) ]]>
Publisher : <![CDATA[Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia ]]>
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DOI: 10.24036/eksakta/vol23-iss03/325
<![CDATA[Soursop leaves contain alkaloids that have pharmacological effects. This study aims determine the total alkaloid content of soursop leaf ethanol extract using a validated HPLC method. Extraction was carried out by soxhletation followed by liquid-liquid extraction using chloroform. Optimizing HPLC conditions on the mobile phase, flow rate, concentration, and wavelength, further testing the validation of the analytical method. Optimizing HPLC conditions obtained optimal results at concentration of 500 ppm with a flow rate of 1.0 mL/min using acetonitrile: methanol: water (80:5:15) at wavelength of 272 nm. These results have met the validation requirements of analytical methods including System Suitability Test (UKS), selectivity, linearity with y = 2.01914x –219,97226, correlation coefficient value (r) = 0.9995, and Vx0 value 0.11201%. The limit of detection and quantization were 8,78525 ppm and 29,28418 ppm, respectively. The RSD percentage of the precision test is 1.0453%, and the accuracy test is obtained from the recovery of 98-102%. The result of determining the total alkaloid content sample was 0.0862 ± 0.004 % (%w/w) of the entire alkaloid content (TALC) triple replication. This research concludes that the analytical method using the HPLC system for determining the total alkaloid content of the ethanolic extract of soursop leaves is validate]]>
<![CDATA[Quality Analysis of Pressure Measurement Automatic Sphygmomanometer and Non-automatic Sphygmomanometer ]]>
<![CDATA[Yeni Pertiwi]]>;
<![CDATA[Nur Hadziqoh]]>;
<![CDATA[Romi Mulyadi]]>;
<![CDATA[Nabila Noria Putri]]>;
<![CDATA[Rizki Eka Putra]]>
<![CDATA[ EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 23 No. 03 (2022): Eksakta: Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) ]]>
Publisher : <![CDATA[Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia ]]>
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DOI: 10.24036/eksakta/vol23-iss03/328
<![CDATA[Hypertension is the fifth leading cause of death in Indonesia. Hypertension occurs because the blood vessels are continuously experiencing high pressure. Medical device that supports doctors and other health workers in diagnosing hypertension is sphygmomanometer. Sphygmomanometer is an instrument for measuring blood pressure. Accuracy of blood pressure measurement is very important in diagnosing hypertension. An Error in measuring blood pressure will be fatal for patients, health workers, and health facilities. So that this study aims to analyze the quality of automatic and non-automatic sphygmomanometer. This research method is in form of quantitative research based on experiments. The data was taken by using direct measurements. Measurements were carried out by using the 2018 Ministry of Health work method. Quality assessment of the sphygmomanometer was taken based on the results of sphygmomanometer calibration analysis. Automatic sphygmomanometer with the OMRON brand got score 95 and the non-automatic sphygmomanometer with the ABN brand got score 97.3. The results of the analysis showed that both tools had high accuracy of pressure measurement and were within tolerance limits. So it can be concluded that both tools are feasible to use.]]>
<![CDATA[Endophy Bacterial Phenoty of Aloe Vera (Aloe barbadensis miller) as the Producer of Antibacterial Compounds Towards Eschericia coli and Staphylococcus aureus ]]>
<![CDATA[Hildegardis Missa]]>;
<![CDATA[Aloysius Djalo]]>;
<![CDATA[Sardina Ndukang]]>
<![CDATA[ EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 23 No. 03 (2022): Eksakta: Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) ]]>
Publisher : <![CDATA[Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia ]]>
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DOI: 10.24036/eksakta/vol23-iss03/329
<![CDATA[The aims of this research are to isolate endophytic bacteria in aloe vera, to determine the antibacterial ability of endophytic bacteria contained in aloe vera against the growth of Staphylococcus aureus and Escherichia coli bacteria and to determine the characterization of endophytic bacteria found in aloe vera. This research is a laboratory experimental study with research procedures, namely sampling by purposive sampling method, isolation of endophytic bacteria carried out by strake plate, antibacterial potential test against Staphylococcus aureus and Escherichia coli using paper disc diffusion method, Morphological identification was carried out by staining bacteria gram, Phenotypic characterization of endophytic bacteria using Profile matching method. The results showed that endophytic bacteria found in aloe vera leaves were characterized by the growth of bacterial colonies on Murashige-Skoog (MS) media with different shapes and colors, the results of the antibacterial potential of endophytes against the growth of Escherichia coli and Staphylococcus aureus showed that there were 6 bacterial isolates that showed clear zones in Escherichia coli and Staphylococcus aureus bacteria and characterization results showed that isolates H2L, H9L and H10L had similar genera to Staphylococcus and Bacillus while isolates H4L, H5L and H7L had similar genera to Pseudomonas.]]>
<![CDATA[Morphology and Optical Properties Analysis of Cu2+ Doped ZnO for Preparation Dye Sensitized Solar Cell (DSSC) ]]>
<![CDATA[Idawati Supu]]>;
<![CDATA[Dewa Gede Eka Setiawan]]>;
<![CDATA[Muh. Fachrul Latief]]>;
<![CDATA[Sri Yanti N Ismail]]>;
<![CDATA[Yita Irmala Sari]]>
<![CDATA[ EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 23 No. 03 (2022): Eksakta: Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) ]]>
Publisher : <![CDATA[Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia ]]>
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DOI: 10.24036/eksakta/vol23-iss03/330
<![CDATA[This research reported Cu2+ un-doped (pure) and doped ZnO semiconductors with variations in Cu2+ concentrations of 3%, 4% and 5% through the sol gel method which aims to determine the morphology and optical properties of ZnO has been investigated. In addition, ZnO film was coated using the doctor blade method with the addition of chlorophyll as a dye sensitizer. Morphological and elemental content tests were carried out using SEM and EDS. The optical properties were analyzed by taking Transmittance data using a UV-Vis Spectrophotometer. SEM analysis with 9900X magnification showed that all samples had small grain sizes and the pores formed were uneven (heterogeneous). The EDS analysis showed that all samples had a higher concentration of zinc by weight than oxygen. UV-Vis Spectrophotometer analysis shows that the transmittance value without dye is lower than using Dye. The addition of Cu2+ concentration affects the morphology and optical properties of ZnO. The higher the addition of Cu2+ added chlorophyll, the higher the absorbance value, so that the transmittance value decreases. The addition of 4% concentration showed the maximum value of chlorophyll as a sensitizer.]]>
<![CDATA[Grundwald-Letnikov Operator and Its Role in Solving Fractional Differential Equations ]]>
<![CDATA[Kankan Parmikanti]]>;
<![CDATA[Endang Rusyaman]]>
<![CDATA[ EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 23 No. 03 (2022): Eksakta: Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) ]]>
Publisher : <![CDATA[Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia ]]>
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DOI: 10.24036/eksakta/vol23-iss03/331
<![CDATA[Leibnitz in 1663 introduced the derivative notation for the order of natural numbers, and then the idea of fractional derivatives appeared. Only a century later, this idea began to be realized with the discovery of the concepts of fractional derivatives by several mathematicians, including Riemann (1832), Grundwal, Fourier, and Caputo in 1969. The concepts in the definitions of fractional derivatives by Riemann-Liouville and Caputo are more frequently used than other definitions, this paper will discuss the Grunwald-Letnikov (GL) operator, which has been discovered in 1867. This concept is less popular when compared to the Riemann-Liouville and Caputo concepts, however, this concept is quite interesting because the concept of derivation is developed from the definition of ordinary derivatives. In this paper will be shown that the formulas for the fractional derivative using the GL concept are the same as the results obtained using the Riemann-Liouville and Caputo concepts. As a complement, we will give an example of solving a fractional differential equation using Modified Homotopy Perturbation Methods.]]>
<![CDATA[Disaster Mitigation Efforts Using K-Medoids Algorithm and Bayesian Network ]]>
<![CDATA[Devni Prima Sari]]>;
<![CDATA[Media Rosha]]>;
<![CDATA[Dedi Rosadi]]>
<![CDATA[ EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 23 No. 03 (2022): Eksakta: Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464) ]]>
Publisher : <![CDATA[Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia ]]>
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DOI: 10.24036/eksakta/vol23-iss03/304
<![CDATA[Disaster mitigation is a series of efforts to reduce disaster risk. One of the disaster mitigation efforts is the supervision of the implementation of spatial planning. Knowing the level of damage to buildings in a region in the event of a disaster can supervise the implementation of spatial planning. To predict the level of damage to buildings in an area, we can use the Bayesian network (BN). There are several types of BN based on the variable type; discrete, continuous, and hybrid BN. A discrete BN is a model in which all the variables involved are discrete. Therefore, if there is a continuous variable, it is necessary to discretize the variable. In this paper, modifications are made to the algorithm commonly used in the clustering process to be used in the discretization process. The algorithm used is the K-Medoids algorithm, where this algorithm uses existing data as a representative of the cluster center. Then, the BN model and the K-Medoids algorithm were used to determine the level of damage to buildings due to the earthquake that occurred in West Sumatra in 2009. From 25,000 house damage data used in this study, we obtain an accuracy rate is 95.17%.]]>
