Garuda - Garba Rujukan Digital

All

Jurnal Natural

natural
Website

Published by Universitas Syiah Kuala

ISSN : 14118513 EISSN : 25414062 DOI : https://doi.org/10.24815/jn

Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemistry Earth & Planetary Sciences Energy Immunology & microbiology Neuroscience Physics

Jurnal Natural (JN) aims to publish original research results and reviews on sciences and mathematics. Jurnal Natural (JN) encompasses a broad range of research topics in chemistry, pharmacy, biology, physics, mathematics, statistics, informatic and electronic.

Arjuna Subject : Matematika - Matematika (Lain-Lain)

Articles 235 Documents

1 2 3 4 5

ANALYSIS OF MINERALS IN CEMPAKA-MADU GEMSTONE FROM ACEH INDONESIA BY USING XRF Ismail .; Akmal Nizar; Mursal .
Jurnal Natural Volume 18, Number 1, February 2018
Publisher : Universitas Syiah Kuala

Abstract. Cempaka-madu is a local name for one kind of gemstone from Aceh province in Indonesia. It is so attractive and its color is dark-orange. We have utilized X-Ray Florescent (XRF) to study these cempaka-madu gemstones from Aceh Tengah and Nagan Raya districts in Aceh province. Our results show that the cempaka-madu gemstone from Nagan Raya district contains 84.90% of SiO2, 8.89% of NiO, 5.47% of Fe2O3, and 0.6% of CaO. The mineral contains in cempaka-madu gemstone from Aceh Tengah district is about the same as those from Nagan Raya district. It is found that the oxide compounds contained in the cempaka-madu gemstone is significantly different than that in jadeite, nephrite-actinolite, nephrite-tremolite, serpentine-clinochrysotile, serpentine-antigoride, and vesuvianite. Consequently, we conclude that the cempaka-madu gemstone from Aceh Indonesia cannot be categorized as jade. Keywords: cempaka-madu gemstone, jade, jadeite, nephrite, serpentine, vesuvianite

Morphology and thermal properties of polypropylene-montmorillonite nanocomposite using modified bentonite of Bener Meriah Aceh JULINAWATI JULINAWATI; BASUKI WIRJOSENTONO; EDDIYANTO EDDIYANTO; SAHARMAN GEA; ICHWANA RAMLI
Jurnal Natural Volume 20 Number 3, October 2020
Publisher : Universitas Syiah Kuala

Research on the use of modified bentonite from Bener Meriah Aceh to study the morphology and thermal properties of polypropylene-montmorillonite nanocomposite (PP-MMT) was carried out. Bentonite was isolated into nano-sized montmorillonite and modified with the addition of PP-g-MA as a compatibilizer and octadecylamine as a modifier of MMT. PP-MMT nanocomposite processing was carried out in an internal mixer at 180 oC with a time of 10 minutes, and a speed of 65 rpm. Based on the results of the TGA-DTA test, the modified bentonite from Bener Meriah Aceh with PP-g-MA and octadecylamine can improve the thermal properties of PP-MMT nanocomposite in a composition comparison of PP; PP-g-MA; MMT is 85; 10; 5. The SEM test results also showed that exfoliation and intercalation had occurred of MMT at PP-MMT nanocomposite.

THE CYTOTOXIC ACTIVITY OF N-HEXANE EXTRACT OF KERSEN(muntingia calabura linn.) LEAVES USING THE BRINE SHRIMP LETHALITY TEST (BSLT) METHOD Irma Sari; Titania Miranda; Sadli Sadli
Jurnal Natural Volume 16, Number 2, September 2016
Publisher : Universitas Syiah Kuala

The cytotoxic activity experiment of n-hexane extract of kersen (Muntingia calabura Linn.) leaves has been carried out using the Brine Shrimp Lethality Test (BSLT) method. The purpose of this research is to identify the secondary metabolites, extract characterize, and determine the LC50 value of the extract against larvae shrimp Artemia salina Leach. Screening result showed that n-hexane extract of kersen leaves contain triterpenoid. Extract characterization showed the results water content of 2.59±0.18 %w/w, water soluble extractive content of 1.9%±0.19 %w/w, the ethanol soluble extractive content of 17.41±1,87 %w/w and total ash value 0.25% w/w. Extract showed LC50 value is 278,72 ppm were calculated by probit analysis. The LC50 value indicated that the n-hexane extract of kersen leaves potentially has cytotoxic activity.

TAXONOMIC STUDY OF PANDANUS (PANDANACEAE) IN SWAMP AREA, ACEH SINGKIL Dwi Ratna Anjaning Kusuma Marpaung; Nursahara Pasaribu; Alief Aththorick
Jurnal Natural Volume 13, Number 2, September 2013
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (458.202 KB)

Taxonomic study on Pandanus (Pandanaceae) in swamp area, Singkil had been conducted from November 2012 until June 2013. Based on morphological characters, 5 species of Pandanus have been identified in the area as Pandanus atrocarpus, Pandanus labyrinthicus, Pandanus militaris, Pandanus odoratissimus and Pandanus tectorius. The morphology and life cycle of species were categorized into two types, and they are medium arborescent pandan (Pandanus labyrinthicus and Pandanus militaris) and large arborescent pandan (Pandanus atrocarpus, Pandanus odoratissimus and Pandanus tectorius). Anatomical characters of Pandanus such as stomata (type, size, papilla) and epidermal cells supported the morphological features.

Natural flavoring formulations of straw mushrooms and quality test with variations in temperature and drying time SADLI SADLI; SITTI SALEHA; RAIYAN RAIYAN
Jurnal Natural Volume 22 Number 3, October 2022
Publisher : Universitas Syiah Kuala

Mushrooms contain a substance known as glutamic acid, that produce a savory taste which has the potential to be developed into a natural flavoring. The research began with the determination of amino acid levels in three phases of harvesting straw mushrooms, namely: the egg phase, the bud phase and the adult phase, by using High Performance Liquid Chromatography which aims to determine the harvesting phase with the highest glutamic acid content. The test results of amino acid levels showed the adult phase contained the highest glutamic acid levels of 49.08 mg/g. Furthermore, the manufacture of straw mushroom flour was performed with temperature variations of 60° C and 70° C and drying times of 6, 7 and 8 hours. Then the flavoring formulation was completed by mixing mushroom flour and other dry additives namely shallots, garlic, white pepper, tapioca flour, salt and sugar. The resulting flavoring test is conducted using a description test by assessing the sensory properties of natural flavorings, namely color, aroma, taste and texture. Based on a panelist rating, F2 (60°C, 7 hours) has the best score for color (3.88) and aroma (3.32). F5 (70°C, 7 hours) has the best score for taste (3.24) and F1 (60°C, 6 hours) has the best score for texture (2.08). The conclusion of this study is that mushrooms have a very high potential to be deformalized into natural flavorings, as well as the natural flavoring quality parameters of mushrooms is influenced significantly by temperature parameters and drying time

CHARACTERISTICS OF NATURAL MAGNETITE (Fe3O4) FROM BEACH SAND AS CATALYST APPLICATION IN MATERIALS INDUSTRY Maulinda Maulinda; Ikramullah Zein; Zulkarnain Jalil
Jurnal Natural Volume 19, Number 1, February 2019
Publisher : Universitas Syiah Kuala

An identification of magnetite nanoparticles synthesized from natural iron sand using co-precipitation method has been conducted. The treatment was undertaken at room temperature and the heating used a pair of acid-base compounds, namely HCL as a solvent and NH4OH as a precipitate. Crystal structures, percentages of elements, particle sizes and magnetic characteristics of the materials were characterized by testing XRF, XRD and Permagraph. The results were then compared with the commercial material purchased from Aldrich (with 97% purity). From the results, it was found that the percentage value of the purity of Fe3O4 derived from natural sand before the extraction was 81.42%, and after the extraction it increased to 86.73%. Furthermore, the saturation magnetization (Ms) value for Fe3O4 ferrite from iron sand was 0.29 T, the residual magnetization or Remanen (Br) was 0.081 T, and Coersivity (Hc) was 1.82 kA/m.

ANTIFUNGAL ACTIVITY FROM ETHYLACETATE EXTRACT OF Plumeria alba AGAINST Candida albicans Murniana Murniana; Israhadi Israhadi; Khairan Khairan; Nurdin Saidi
Jurnal Natural Volume 11, Number 2, September 2011
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (176.904 KB)

An investigation on the chemical constituents of plumeria alba has been studied. The compound was extracted from the bark using n-hexane and ethyl acetate as solvent, respectively. The crude was subjected to chromatographic techniques. Isolation and purification of the compound afforded the indole alkaloid. The ethylacetate extract was test to antifungal activity against Candida albicans. The test result sowed inhibition zone of 10 mm on 20% extract concentration.

SEMI-IMPLICIT NUMERICAL SCHEMA IN SHALLOW WATER EQUATION safwandi safwandi; Syamsul Rizal; Tarmizi Tarmizi
Jurnal Natural Volume 17, Number 2, September 2017
Publisher : Universitas Syiah Kuala

Abstract. A two-dimensional shallow water equation integrated on depth water based on finite differential methods. Numerical solutions with different methods consist of explicit, implicit and semi-implicit schemes. Different methods of shallow water equations expressed in numerical schemes. For bottom-friction is described in semi-implicitly. This scheme will be more flexible for initial values and boundary conditions when compared to the explicit schemes. Keywords: 2D numerical models, shallow water equations, explicit and semi-implicit schema.Reference Hassan, H. S., Ramadan, K. T., Hanna, S. N. 2010. Numerical Solution of the Rotating Shallow Water Flows with Topography Using the Fractional Steps Method, Scie.Res,App.Math. (1):104-117. Omer, S, Kursat, K. 2011. High-Order Accurate Spectral Difference Method For Shallow Water Equations. IJRRAS6. Vol. 6. No. 1. Kampf, J. 2009. Ocean Modelling for Beginners. Springer Heidelberg Dordrecht. London, New York. Wang, Z. L., Geng, Y. F. 2013. Two-Dimensional Shallow Water Equations with Porosity and Their Numerical scheme on Unstructured Grids. J. Water Science and Engineering. Vol. 6, No. 1, 91-105. Saiduzzaman, Sobuj. 2013. Comparison of Numerical Schemes for Shallow Water Equation. Global J. of Sci. Fron. Res. Math. and Dec. Sci. Vol. 13 (4). Sari, C. I., Surbakti, H., Fauziyah., Pola Sebaran Salinatas dengan Model Numerik Dua Dimensi di Muara Sungai Musi. Maspari J. Vol. 5 (2): 104-110. Bunya, B., Westerink, J. J. dan Shinobu, Y. 2004. Discontinuous Boundary Implementation for the Shallow Water Equations. Int. J. Numer. Meth. Fluids 2005 (47): 1451–1468.

ANTIBACTERIAL ACTIVITY TEST OF ETHANOL EXTRACT OF WHITE AND RED FLESH FROM GUAVA LEAF ( Psidium guajava. L) AGAINTS Staphylococcus aureus AND Escherichia coli Hilda Maysarah; Rika Apriani; Misrahanum Misrahanum
Jurnal Natural Volume 16, Number 1, March 2016
Publisher : Universitas Syiah Kuala

An antibacterial activity test of ethanol extract of white and red flesh from guava leaf (Psidium guajava. L) against S.aureus and E.coli; using agar diffusion method was carried out in order to produce the extract. The extract was collected using maceration method. The concentration of extract was 7,8125; 6,1035; 5,00; 4,8828; 4,3944; and 3,90625 mg/mL. The results showed that both of extracts had antibacterial activities. Ethanol extract of white flesh of fruit guava leaf had (Minimum Inhibitory Concentration) MIC value at 5.000 mg/mL against S.aureus and 4.8828 mg/mL against E.coli. Whereas ethanol extract of red flesh of fruit guava leaf had MIC value at 4.3944 mg/mL against S.aureus and E.coli. MIC value of ethanol extract of white flesh of fruit guava leaf is equal with MIC value of clindamicin concentration at 3.00 µg/mL against S.aureus, and 1.00 µg/mL against E.coli. The MIC value of red flesh of fruit guava leaf is equal to the MIC value of clindamicin concentration at 3.00 µg/mL against S.aureus, and 1.00 µg/mL against E.coli.

QUALITY CONTROL X RAYS MAMMOGRAPHY IN THE EFFORT MITIGATION INCREASING NUMBER OF CANCER PATIENTS Rini Safitri; Evi Yufita
Jurnal Natural Volume 17, Number 1, March 2017
Publisher : Universitas Syiah Kuala

Abstract. Early detection of breast cancer is the first step in prevention that can be done by women, therefore when one is diagnosed with breast cancer, the appropriate treatment can be performed quickly and accurately. Early diagnosis of breast cancer can be a way of mitigation in preventing breast cancer through the use of mammography. Bureau of Radiology as said by The Joint Commission on Accreditation of Hospitals (JHCA) stated that one of the responsibilities of the radiology unit is to control the quality of service which aims to minimize the radiographic image repetition factor; as well as maximizes the quality of radiographic image. Quality control tests are an effort that is needed on the mammography X-ray diagnostics tools. This is done to maintain the quality of expected output. The parameters that are included within the radiation output are the magnitude of current and the voltage of tube that are produced; therefore they remained constant and correspond to the recommended standard. Bureau of Radiological Health, as said by JHCA mentioned that to control the quality of image which will minimize the radiographic image repetition and maximizes the quality of radiographic image. Therefore the radiation output will not be dangerous later. The early stage of the quality control test on the machine was conducted by setting all the filtrations which were placed to capture the x-ray on the x-ray plane tube with minimum value. Then, ionization chamber is placed on the test subject points; right after that the distance between it to the radiation source is noted. The x-ray film is place on a film on the compression table of the patient and the distance between film and the focus point is noted. This is then exposed using a target filter Mo/Mo by setting the current as well as variation the voltage and time. The standard voltage measurements are 20-33kVp. This data is from the observations of time exposure; the output value is then noted. The above procedure is conducted from the minimum voltage to the maximum voltage. The output ray is measured for each voltage. The same procedure is conducted to the target filter Mo/RH. The results obtained are that the greater the input voltage and current will subsequently produce greater doses, therefore the exposure has exceeded the standard limit 0.1 mHy with longer exposure time. The HVL density thickness on the mammography X-ray machine determined the quality of the beam and the doses of x-ray exposure on the mammography machine. The output stability of x-ray beam exposure in the mammography machine mode Mo/Mo still fulfill the standard which is the value of 69% Keywords: Quality Control, Sinar-X, mammography, Mp/Mo, Mo/RH

Page 2 of 24 | Total Record : 235

1 2 3 4 5

Filter by Year

2010 2023

Filter By Issues

All Issue Volume 23 Number 2, June 2023 Volume 23 Number 1, February 2023 Volume 22 Number 3, October 2022 Volume 22 Number 2, June 2022 Volume 22 Number 1, February 2022 Volume 21 Number 3, October 2021 Volume 21 Number 2, June 2021 Volume 21 Number 1, February 2021 Volume 20 Number 3, October 2020 Volume 20 Number 2, June 2020 Volume 20 Number 1, February 2020 Volume 19 Number 3, October 2019 Volume 19 Number 2, June 2019 Volume 19, Number 1, February 2019 Volume 18, Number 3, October 2018 Volume 18, Number 2, June 2018 Volume 18, Number 1, February 2018 Volume 17, Number 2, September 2017 Volume 17, Number 1, March 2017 Volume 16, Number 2, September 2016 Volume 16, Number 1, March 2016 Volume 15, Number 2, September 2015 Volume 15, Number 1, March 2015 Volume 14, Number 2, September 2014 Volume 14, Number 1, March 2014 Volume 13, Number 2, September 2013 Volume 13, Number 1, March 2013 Volume 12, Number 2, September 2012 Volume 12, Number 1, March 2012 Volume 11, Number 2, September 2011 Template More Issue

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name
Suhartono

Contact Email
suhartono@usk.ac.id

Phone
-

Journal Mail Official
jurnal.natural@fmipa.unsyiah.ac.id

Editorial Address
Block A 2nd Floor FMIPA USK Jl. Tegk. Syech Abdurrauf No. 3, Banda Aceh, 23111, Indonesia

Location
Kab. aceh besar,

Aceh

INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name Suhartono

Contact Email suhartono@usk.ac.id

Phone -

Journal Mail Official jurnal.natural@fmipa.unsyiah.ac.id

Editorial Address Block A 2nd Floor FMIPA USK Jl. Tegk. Syech Abdurrauf No. 3, Banda Aceh, 23111, Indonesia

Location Kab. aceh besar, Aceh INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Contact Name
Suhartono

Contact Email
suhartono@usk.ac.id

Phone
-

Journal Mail Official
jurnal.natural@fmipa.unsyiah.ac.id

Editorial Address
Block A 2nd Floor FMIPA USK Jl. Tegk. Syech Abdurrauf No. 3, Banda Aceh, 23111, Indonesia

Location
Kab. aceh besar,

Aceh

INDONESIA