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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 315 Documents

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Mediastinal Tumor Thymoma Type B1 T4N2M1B Stage IVB with Multimodality Therapy Muhammad Zakki Al-Fajri; Sabrina Ermayanti; Afriani Afriani
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 incidence of thymoma increases with age, generally occurs in the 40-60s. Thymoma cases are rare at a young age. The prevalence of thymoma at a young age is very small at 0.6 – 5% of all thymoma cases. Thymoma management requires multimodality therapy depending on the stage of the thymoma, along with the development of surgery, radiotherapy and chemotherapy in the past three decades. A 21-year-old male patient with complaints of shortness of breath since 5 months before being admitted to the hospital. The patient has been diagnosed with thymoma type Mediastimum Tumor Type B1 T4N2M1B stage IVB from the results of chest X-ray investigations, chest CT scan, bronchoscopy and histopathological examination. The patient has received various therapeutic modalities including 6 cycles of chemotherapy, 30 radiotherapy and thymectomy surgery

Growth and Production of Long Bean Plants (Vigna sinensis L.) on Concentration Level of Liquid Organic Fertilizer Banana Webs and Chitosan Zahanis Zahanis; Fatimah Fatimah; Yulia Anggraini
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 aim of this study was to determine the interaction of the concentration of liquid organic fertilizer on banana weevil and chitosan on the growth and yield of long beans. This study used a completely randomized design, with 2 factors. The first factor is banana weevil liquid organic fertilizer consisting of 3 levels, namely, 0 ml/L, 45 ml/L, and 90 ml/L. The second factor was chitosan consisting of 3 levels, namely, 0 ml/L, 3 ml/L, and 6 ml/L. Based on the experimental results, it can be concluded that there is an interaction between liquid organic fertilizer of banana weevil and chitosan with the parameters of plant length and number of branches. Increasing the concentration of liquid organic fertilizer on banana weevil can increase the number of pods and the weight of fresh pods per plant, the highest fresh pod weight per plant is 1.20 kg/plant with a concentration of 90 ml/L. The administration of chitosan concentration only affected the number of pods parameter, the highest number of pods was in the provision of 6 ml/L, namely 55.55 pods/ plant.

The Adsorption of Mercury from Aqueous Solution on Durian (Durio zibethinus) Seed Immobilized Alginate Intan Lestari; Silfia Devi Eka Putri Putri; Martina Asti Rahayu; Diah Riski Gusti
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 increasing pollution of toxic heavy metals in the environment is an important issue worldwide. Heavy metal ions such as mercury have attracted special attention because of their high toxicity and long half-life which increase the potential to accumulate in the food chain and cause serious damage to the environment. The potential of an adsorbent durian (Durio zibethinus) seed immobilized alginate bead was carried out and used for the adsorption of Mercury in an aqueous solution. Adsorbents were characterized by FTIR, SEM, and XRF. FTIR analysis shows the functional groups of alcohol, amine, and carboxylic acid. Scanning Electron Microscopy shows that the surface morphology of durian seed powder of granules and durian seed immobilized in Ca-alginate of like as tissue eggs in an egg box shape. XRF analysis durian seed immobilized showed that Hg(II) ion adsorbed as much as 37%. The adsorption parameter of Hg(II) ion are pH at 6 with an adsorption capacity was 1.553 mg/g, contact time at 150 minutes with adsorption capacity was 2.880 mg/g, mass 0.1 g with adsorption capacity of 2.274 mg/g, and concentration 250 mg/g with adsorption capacity of 62.067 mg/g.

Biomol Potential from Vegetable Market and Tofu Factory Waste for Cleared Land Crops Nourma Yulita; Mohammad Agus Prayitno; Sultan Ahmad Fausan
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

This research was conducted in Cialam Caya Village, Konda Subdistrict, South Konawe Regency, in July - September 2021. The purpose of the study was to determine the effect of various doses of Biomol on the growth and yield of mustard greens. This study was arranged in a Randomized Block Design (RAK) which consisted of 7 treatments with biomol doses, namely: control (without biomol), P1 50 ml, P2 100 ml, P3 150 ml, P4 200 ml, P5 250 ml, P6 300 ml, 3-time treatment repetition to produce 21 experimental units. The results of this study concluded that the administration of biomol had a very significant effect on the growth and yield of mustard greens (plant height, number of leaves, fresh weight and dry weight) and the best dose of biomol for mustard greens (Brassica Juncea L.) was at a dose of 200 ml.

The Determination of Cation Exchange Capacity of Napa Soil in 50 Kota Regency using Atomic Absorption Spectrophotometer Mawardi Mawardi; Fadhlurrahman Mawardi; Illyas Md Isa; Sunyono Sunyono; Hary Sanjaya; Ilham Ardatul Putra; Vira Nilmania; Irfan Ananda Ismail
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 23 No. 02 (2022): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/eksakta/vol23-iss02/314

This research discuss about the cation exchange capacity of napa soil by using an atomic absorption spectrophotometer. The results is a value of the cation exchange capacity (CEC) and to review the differences of napa soil value and its influence on early treatment in the form of purification and treatment by using barium chloride method. According to the research that has been done, obtained the optimum concentration of BaCl2 is 0.15 M and 0.15 M for MgSO4. Determination of CEC in optimum condition showed that napa soil that has been purified have higher CEC value, CEC value of napa soil in Situjuah Limo Nagari District is 1.7 meq/g and CEC value of napa soil in Sarilamak District is 1.2 meq/g. A fresh napa soil relatively has low value than napa soil that has been purified, the CEC value of napa soil in Situjuah Limo Nagari District and Sarilamak District are 0.93 meq/g and 1.03 meq/g. While napa soil which has been given treatment with peroxide showed that CEC value declined sharply, the CEC value of napa soil in Situjuah Limo Nagari District and Sarilamak District which has been given treatment with peroxide are 0.3 meq/g and 0.7 meq/g.

Study of Inflation using Stationary Test with Augmented Dickey Fuller & Phillips-Peron Unit Root Test (Case in Bukittinggi City Inflation for 2014-2019) Afnita Roza; Evony Silvino Violita; Sherly Aktivani
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 23 No. 02 (2022): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

This classical regression model is designed to handle the relationship between stationary variables and should not be applied to non-stationary series. A time series data is said to be stationary if the mean, variance, and covariance remain constant over time. The problem associated with non-stationary variables, and often encountered by researchers when dealing with time series data, is spurious regression. A clear indicator of false regression is the low Durbin-Watson statistic but has a higher coefficient of determination (R2). Therefore, before doing modeling or forecasting using time series data, it is very important to do a stationary test. In this study, we use inflation data in the City of Bukittinggi from January 2014 to December 2019 as a case study. The data shows an uptrend and correlated error terms. Empirical results show that inflation data in Bukittinggi City is a stationary series.

University Students' Procrastination: A Mathematical Model (Case Studies: Student in Mathematics Department Universitas Negeri Padang) Rara Sandhy Winanda; Akira Mikail; Defri Ahmad; Dina Agustina; Rahmawati Rahmawati
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 23 No. 02 (2022): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Mathematical modeling of procrastination was carried out on students in the Mathematics Department at Universitas Negeri Padang. Procrastination is the tendency to delay work and can be contagious among students. Mathematical modeling of procrastination aims to show the spread of procrastination among students. The SEIR compartment model was applied in this study. From a total of 1,154 population members, 93 samples were randomly selected and were given a questionnaire to estimate the parameter values in the model. A couple of steady states appear in the model. The free disease steady state has a biological meaning since all the variables are real, while the endemic steady state is surreal in biological terms. The number of its basic reproduction number, from which the parameter values are derived from the primary data, indicates stability analysis near the free disease steady states. The result shows that procrastination is spread among students in the population, with the number of Ro is 1,009.

Comparison of Portfolio Mean-Variance Method with the Mean-Variance-Skewness-Kurtosis Method in Indonesia Stocks Dina Agustina; Devni Prima Sari; Rara Sandhy Winanda; Muhammad Rashif Hilmi; Dina Fakhriyana
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 23 No. 02 (2022): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

In this paper, we compare the optimal portfolio weight of mean-variance (MV) method with mean-variance-skewness-kurtosis (MVSK) method. MV is a method to get weight on a portfolio. This method can be developed into the method of MVSK with attention to the higher-order moment of return distribution; skewness and kurtosis. In determining the weight of portfolio is also important to consider the skewness and kurtosis of return distribution. This method of considering the aspect of skewness and kurtosis is called the MVSK method with the aim of maximizing the level of return and skewness and minimizing the risks and exceeding of kurtosis. The result indicate that the optimal portfolio return of all methods is MVSK method with minimize variance priority.

Leaf Epidermal Comparison of Phasey Bean (Macroptilium lathyroides) and Siratro (Macroptilium atropurpureum) I Made Saka Wijaya; Eniek Kriswiyanti
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 23 No. 02 (2022): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Phasey bean (Macroptilium lathyroides) and siratro (Macroptilium atropurpureum) are introduced legumes that become a common species in pastureland. The nutritional content of these legumes has been explored, but on the contrary the anatomical study. The anatomical trait, especially in leaf epidermal, have been used to increase the understanding in taxonomy. This study aimed to investigate the leaf epidermal variability among phasey bean and siratro. The method used longitudinal section for upper and lower epidermal, then stained in safranin 0,1%. The results show that the upper epidermal in phasey bean have polygonal epidermal cell, while the lower part and the both part of siratro have irregular-shaped. The type of stomata in upper epidermal of phasey bean is paracytic and the lower epidermal is paracytic and anomocytic. Both epidermal sides in siratro have paracytic and anomocytic stomata. The index of stomata in phasey bean is higher than the siratro, but the index of trichomes in phasey bean is lower than siratro. The trichomes only absent in upper epidermal of phasey bean. Both plants have a similar types of trichomes: capitate glandular trichomes and linear non-glandular trichomes.

Physicochemical Properties of Herbal Tea Bags from Belimbing Wuluh Leaves (Averrhoa bilimbi) and Gotu Kola Leaves (Centella asiatica) with the Addition of Cinnamon Powder (Cinnamomun burmanii) Diana Sylvi; Daimon Syukri; Fachrur Rozi; Devi Purnama Sari
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 23 No. 02 (2022): 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 study the characteristics of herbal teabags from belimbing wuluh leaves and gotu kola leaves with the addition of cinnamon powder. This study used a completely randomized design with 5 treatments, namely differences in the addition of cinnamon powder 0%, 1%, 2%, 3% and 4% with 3 replications. The data obtained were analyzed statistically using ANOVA (Analysis Of Variance) and if they were significantly different, then continued with the DNMRT (Duncan's News Multiple Range Test) test at 5% level. The results showed that the level of addition of cinnamon powder had a significant effect on antioxidant activity, total water soluble ingredients, total polyphenols, color, taste, and flavor. Differences in the substitution level of cinnamon powder had no significant effect on water content and pH. The best treatment in this study was treatment E with the addition of 4% cinnamon powder, the organoleptic results obtained were the average value of color preference 3.95 (like), taste 3.65 (like), and flavor 4 (like). The results of chemical analysis on tea products are water content 7.88%, total polyphenols 109.32 mg GAE/g, IC50 value 96.71, total water soluble ingredients 19.66% and in steeped tea pH value is 6.13, and activity antioxidant 36.93%.

Page 15 of 32 | Total Record : 315

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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