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Eksakta : Berkala Ilmiah Bidang MIPA

eksakta
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Published by Universitas Negeri Padang

ISSN : - EISSN : 25497464 DOI : https://doi.org/10.24036/eksakta/

Core Subject : Science, Education, Agriculture, Social, Engineering,

Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Mechanical Engineering

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

Arjuna Subject : Umum - Umum

Articles 314 Documents

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Preparation and Characterization of Magnetite Fe3O4-Activated Carbon Composite as Adsorbent Cr(VI) Ion Intan Lestari; Yonanda Ramadhanty; Leny Marlinda; Ngatijo Ngatijo
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 22 No. 4 (2021): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Metal ion such as Cr(VI) is one toxic heave metal at the trace level, thus it is necessary to remove metal ion Cr(VI) ion environmental. The absorption of Cr(VI) ions was carried out using a Fe3O4 magnetite activated carbon composite. Activated carbon prepare from palm shells (Elaeis guinensis Jack) was composite with magnetite Fe3O4 by co-precipitation method. Magnetite Fe3O4-activated carbon composite is characterized by SEM, VSM and XRD. SEM image show that Fe3O4 a deposit on the surface of activated carbon. The degree of magnetization of Fe3O4 with VSM obtained 20.99 emu/g. The pattern of XRD diffractogram show that diffraction peak at 2θ which was 6.5495o; 30.1146o; 35.3581o; 43.063o; 57.1369o; 62.5918o. The spectra of FTIR show that functional groups exist in composites such as carboxyl, carbonyl and hydroxyl groups. Adsorption of Cr(VI) ion occurs at pH 5, contact time is 30 minutes and a maximum concentration of 200 mg/L Cr(VI) with a maximum adsorption capacity was 43.4 mg/g.

Characterization of Biodegradable Plastic Nata De Soya Using Glycerol and Palm Oil Addictive Substances Iryani Iryani; Iswendi Iswendi; Sri Benti Etika; Citra Devira; Regi Fadila Putra
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 22 No. 3 (2021): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

This research aimed to analyze the characterization of biodegradable plastic nata de soya (NDS). The addictive substance used to manufacture this plastic is a mixture of glycerol and palm oil with a saturated solution of arabic gum as an emulsifier. The volume variations are A (10:5:15) mL, B (10:10:30) mL, C (10:15:45) mL, control is (10 mL of 3% glycerol) and soaking time for NDS sheets with additives are 4, 6, and 8 days. The results showed that the highest degradation power of NDS is 87% in the variation of additive C with an immersion period of 8 days had a degree of crystallinity of 8.075%. The water resistance test was 318% in an immersion of NDS plastic with a variation of C for four days had a degree of crystallinity of 12.47%. The highest tensile strength value of plastic was 23.459 MPa in the composition of additive C with four days of immersion and had a degree of crystallinity of 13.172%.

The Effects of Extraction Period Toward Anthocyanin Levels of Blue Pea Vine (Clitoria ternatea) Extract Using Maceration Method Irna Dwi Destiana; Atika Romalasari; Nia Kurnia
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 22 No. 4 (2021): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Blue Pea Vine (Clitoria Ternatea L.) is an edible flower which is rich in compounds of anthocyanin. The purpose of this research is to determine the best immersion time for anthocyanin extraction of blue pea vine by using maceration method. It also attempts to reveal the anthocyanin content, as well as the color and pH from blue pea vine extraction. Three treatments were treated with two replications, namely the first treatment of soaking is for 24 hours, 48 hours and 72 hours. The best soaking time in the treatment was 48 hours which resulted the highest anthocyanin content of 172,833 mg/100g. The color result was based on the level of attention to the achromatic color from the extraction of 48 hours of blue connection with an L* value of 25.95, the a* value of -0.4, and b* value of 1.35. The pH value result is pH 4.61

Distribution Pattern of Magnetic Susceptibility Value of Iron Sand on the Surface of Pasia Jambak Beach Pasia Nan Tigo Padang Riza Rahmayuni; Hamdi Rifai; Letmi Dwiridal; Ardilla Nofri Yuwanda; Dwi Anisa Visgus; Anisa Rahmi
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 22 No. 4 (2021): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Iron sand is a natural resource in Indonesia that can be utilized based on magnetic mineral content (Fe203, Fe3O4, FeTiO3), to be processed into materials of high economic value. Iron sand magnetic mineral distribution was analyzed to see potential in Pasia Jambak Beach, Pasia Nan Tigo, Padang, where the iron sand in this area has not been fully utilized by the community and government. The potential of iron sand can be seen usiing Magnetic Method with a magnetic chaaracteristic test in the form of the susceptibility value of iron sand. Magnetic susceptibility value iron sand on the surface of Pasia Pantai Jambak varies betwen 485,2 × 10-8 m3/kg up to 13077 × 10-8 with an average 3.306, 37 × 10-8 m3/kg.. The results of the contour map show that high-value magnetic susceptibility values are scattered near the estuary, namely Muaro Anai and Muaro Baru, this is because magnetic minerals (Fe203, Fe3O4, FeTiO3) which have high density are more likely to settle near the estuary, then the rest spreads to the coast.

Effect of Bokashi Fertilizer and Monosodium Glutamate on Growth and Yield of Cayenne Pepper (Capsicum frutescens l.) Zahanis Zahanis; Fatimah Fatimah; Utria Nurval Utami
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 22 No. 4 (2021): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

This study aims to determine The purpose of this experiment was to determine the interaction of bokashi fertilizer and monosodium glutamate on the growth and yield of cayenne pepper (Capsium frutescens L.). This experiment used a completely randomized design (CRD) factorial. The first factor is the dose of rice straw bokashi which consists of 4 levels, namely: 0 g/polybag, 50 g/polybag, 100 g/polybag, 150 g/polybag. The second factor is the dose of MSG which consists of 3 levels, namely: 0 ml/l water, 4 ml/l water, 8 ml/l water. Based on the results of the study, it was found that the application of bokashi fertilizer and monosodium glutamate interacted with the growth and yield of cayenne pepper (Capsicum frutescens L.), namely producing the weight of the fruit plants by giving 150 g/polybag of bokashi fertilizer and 8 ml/l of MSG water, namely 60.67 g of weight fruit.

Negative Binomial Regression in Underdispersion(Case Study: Neonatal Mortality in Jambi City) Corry Sormin; Gusmanely Z
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 23 No. 01 (2022): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Neonatalis is birth before 28 days of a baby. Factors that are considered to affect neonatal mortality include the number of visits in the 1st and 3 rd trimester, the number of pregnant women receiving Tetanus Diptheria Immunization, the estimated number of neonatal infants with complications, the number of infants receiving Hepatitis B Immunization for less than 24 hours, the number of infants receiving BCG Immunization and number of 1 and 3 neonatal visits. Neonatal mortality is still very rare so that the right analysis is used, namely Negative Binomial Regression. This research aim to investigate negative binomial regression in underdipersion on neonatal mortality at Jambi City. These two regression methods are specifically used for Poisson distributed data because they are rare. The stages of the research that will be carried out are the Poisson distribution test and the equidispersion assumption, parameter estimation, model feasibility test, and selection of the best model. The results obtained that the best model without the variable number of 3rd-trimester visits or without the variable number of infants who received BCG immunization with AIC was 36.3.

Comparison of the Physical and Microbiological Characteristics of Peel-off Face Mask Yogurt from Fresh Cow’s Milk and UHT Milk Fermented Wulan Kartika Sari; Rika Sebtiana Kristantri; Dyan Wigati
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 22 No. 4 (2021): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Yogurt is a product of fermented milk that makes the skin smoother and shinier. Alpha Hydroxy Acid (AHA) in yogurt can increase regeneration and exfoliate skin cells that accumulate on the surface of the stratum corneum. The aims of studied are to compare the physical characteristics and total plate count values of peel-off face mask yogurt made from fresh cow’s milk and UHT milk at 1% and 2% levels. Fresh cow,s milk and UHT milk are heated to 80 ⁰C then cooled to 40-50⁰C. As much as 1% and 2% starter bacteria consisting of Lactobacillus bulgaricus, Streptococcus thermophilus, Lactobacillus acidhophilus, and Bifidobacterium were inoculated into milk then incubated at 37 ⁰C for 7 hours. Yogurt was made into a peel-off mask and evaluated for physical characteristics and total plate number. The result showed that was a statistically significant difference in the physical characteristics of peel-off face mask yogurt made from fresh cow’s milk and UHT milk at 1% and 2% levels.

Health Belief Model of Jambi City Community Against Covid-19 Vaccination with Structural Equation Modeling (SEM) Method Sherli Yurinanda; Cut Multahadah; Susi Marisa
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 23 No. 01 (2022): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

The community's HBM (Health Belief Model) analysis of the COVID-19 vaccination needs to be done. This perceived threat assessment is based on perceived vulnerability and seriousness. Judgments to behave in response to perceived threats are also influenced by cues to action. Variables that cannot be explained directly or variables that require explanation from other variables are called latent variables. Latent variables consist of exogenous and endogenous variables. This study aims to analyze the public health belief model of the city of Jambi towards COVID-19 vaccination with the structural equation modeling (SEM) method. The results showed that the health belief model for COVID-19 vaccination in Jambi City, vaccination actions were significantly influenced by perceptions of benefits and barriers. Perceived benefits and barriers were significantly affected by perceived severity and seriousness and then perceived severity and seriousness were significantly influenced by cues to action. However, demographics including age, occupation, income and beliefs in this study did not significantly influence a person to vaccinate. The proposed model can be accepted based on the goodness of fit indicator

Reducing the Number of Germs on Hands Using Disinfectants Combination of Betal Leaves and Kalamansi Orange Iwan Iskandar; Hevi Horiza; Mutia Yuhesti
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 22 No. 4 (2021): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Covid-19 can be spread through particles from a patient's sneeze or cough attached to other objects such as clothing or electronic devices from people around him. Therefore, it is necessary to take precautions to prevent the spread of Covid-19. There are many ways to prevent the transmission of Covid-19, one of which is the use of antiseptics and disinfectants. We can make disinfectants from natural ingredients such as boiled betel leaves and lime juice. Both of these plants have compounds that function as anti-microbial. From the results of the study, it was found that of the 3 combination formulas of Betel and Kalamansi, the best formula for reducing the number of germs was formula 2, namely the combination of Betel and Kalamansi with a ratio of 60:40. For testing against the nCov-2019 Virus, the best formula is formula 3, namely the combination of Betel and Kalamansi 40:60 with the results of 30 positive samples, 20 samples being negative due to damage to the glycoprotein envelope layer.

The Effect of Additional Fruit Eggplant (Solanum betaceum cav.) Juice on the Characteristics of Black Tea (Camelia sinensis) Beverage Diana Sylvi; Fauzan Azima; Sandonella Anggini
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 22 No. 4 (2021): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

This study aims to determine the effect of adding Dutch eggplant juice on the characteristics of black tea drinks. This study used a completely randomized design (CRD) with 5 treatments and 3 replications. The data was analyzed statistically with the F test, if it was significantly different, it was continued with Duncan's new Multiple Range Test (DNMRT) at the level of 5%. The addition of Dutch eggplant juice was 6%, 8%, 10%, 12%, 14%. This study showed the effect of adding Dutch eggplant juice to vitamin C, PH, antioxidants, polyphenols, flavonoids, alkaloids, tannins, saponins and sensory analysis (color, aroma and taste). The best product was the product with treatment E (addition of 14% Dutch eggplant extract) with antioxidant characteristics of 77.67%, polyphenols 393.37 mg GAE/g, flavonoids 296.83 mg QE/g, vitamin C 168.96 mg/100g, pH 4, alkaloid (+), tannin (+), saponin (+), color 3.05, aroma 3.90 and taste 3.75.

Page 14 of 32 | Total Record : 314

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Rahadian Zainul

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rahadianzmsiphd@fmipa.unp.ac.id

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+6281261385385

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eksakta@ppj.unp.ac.id

Editorial Address
Jl Prof Dr Hamka Air Tawar Barat

Location
Kota padang,

Sumatera barat

INDONESIA

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Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name Rahadian Zainul

Contact Email rahadianzmsiphd@fmipa.unp.ac.id

Phone +6281261385385

Journal Mail Official eksakta@ppj.unp.ac.id

Editorial Address Jl Prof Dr Hamka Air Tawar Barat

Location Kota padang, Sumatera barat INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Contact Name
Rahadian Zainul

Contact Email
rahadianzmsiphd@fmipa.unp.ac.id

Phone
+6281261385385

Journal Mail Official
eksakta@ppj.unp.ac.id

Editorial Address
Jl Prof Dr Hamka Air Tawar Barat

Location
Kota padang,

Sumatera barat

INDONESIA