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Jurnal Natural
Published by Universitas Syiah Kuala
ISSN : 14118513     EISSN : 25414062     DOI : https://doi.org/10.24815/jn
Core Subject : Science, Agriculture,
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 7 Documents
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Search results for , issue "Volume 15, Number 1, March 2015" : 7 Documents clear
Reference on Thermophysical Properties: Density and Viscosity of Several Gases by Using Macro Excel (RSSDFIUSK vs. 1) Elin Yusibani
Jurnal Natural Volume 15, Number 1, March 2015
Publisher : Universitas Syiah Kuala

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Abstract

A source code for calculating reference on thermophysical properties: density and viscosity for several gases (nitrogen, helium, hydrogen, argon and air) has been developed under Visual Basic for Applications (VBA) programming in MS Excel (as a macros). Selected density and viscosity equations have been chosen as a basic equation in the VBA programming as a user-defined function. This macro is very useful for engineers and researchers due to enhance their experimental and/or theoretical studies.
Interpretasi Potensi Massa Longsoran Dengan Metoda Geolistrik(Studi Kasus Daerah Gayo Lues) Muchlis Muchlis
Jurnal Natural Volume 15, Number 1, March 2015
Publisher : Universitas Syiah Kuala

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Abstract

One indication of a potential landslide area is a formation along the slip field slope. The slope is formed due to the difference between the cover layers (top soil) with a layer beneath it. The top layer is usually a layer of soil that passes the water so that it could be easily infiltrated into the slope. However, rain water infiltrated into the soil or are often not able to enter deeper into the ground because there is an impermeable layer which forms the slope area. Geoelectric resistivity method is generally used for shallow exploration, approximately to depth of 300 to 500 meter. The principle of the method is that the electrical current injected into the earth through two current electrodes, while the potential difference that occurs is measured through two potential electrodes. From the results of measurements of currents and electric potential difference can be obtained by variation of value of electrical resistivity in the layer below the measuring point. The resistivity value can show the bedding soils and on which one is the layer of slip field. From this study we expected the resistivity 2D cross section that shows the depth and dimensions of the field of slip on the slope studied so as to provide recommendations on the appropriate method of stabilizing slopes.
Potency Study of N-Hexane Extracts of Black Plum (Syzygium cumini (L.) Skeels) Intheinhibitation of Growth Salmonella typhi and Candida sp. Saida Rasnovi; Risa Nursanty
Jurnal Natural Volume 15, Number 1, March 2015
Publisher : Universitas Syiah Kuala

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Abstract

N-hexane extracts of the bark from black plum(Syzygium cumini (L.) Skeels) showed activity againtSalmonella typhi. Meanwhile,  the result showed that N-hexane was not able to inhibit the  growth of Candida sp. The research was done at Microbiology laboratory, Biology Department Faculty of Mathemathics andScience,  Syiah Kuala University. The bark of black plum were collected from Aceh Besar District. The extraction method  for black plum used maceration with N-hexane and than concentrated in rotary evaporator. The disc diffusion method used to screen the antimicrobial activity with 20 %, 30 %, 40 % dan 50 % concentration.
The Influence of Coconut Water and Activated Charcoal in MS Medium on In Vitro Callus Regeneration of Dendrobium sp. Cultivar Bertha Chong Orchids Dessi Novita Sari; Zairin Thomy; Yunita Yunita
Jurnal Natural Volume 15, Number 1, March 2015
Publisher : Universitas Syiah Kuala

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Abstract

Dendrobium is one of the most commercial orchids. In Vitro technique is one of solution to fulfill the market demand of Dendrobium. Organic matters, such as coconut water, and activated charcoal are often given to in vitro medium to regenerate orchids callus. The addition of activated charcoal is not only adsorbing toxic substances but also organic matters. The aimof this researchistofindthe best combination for callus regeneration medium. The research was conducted at the Biological Cell and Molecular Laboratory, Mathematics and Natural Science Faculty of Syiah Kuala University, Darussalam, Banda Aceh since March to November 2013. The method used is experimental with Completely Randomized Factorial Design with two factor; treatments of coconut water and activated charcoal. The result showed that the combinationof 150mL/Lcoconut waterand2,0g/Lactivated charcoal is the best resultbecauseit is the onlytreatment that have capability in producingplantletswithin60days.
Analisis Diskriminan Melalui Metode Fisher Terhadap Kemampuan Siswa Dalam Menguasai Materi Bangun Ruang Pada Kelas Viii Smp Negeri 1 Banda Aceh Tahun Pelajaran 2013/2014 Khairul Umam; Yuhasriati Yuhasriati; Nadya Nadya
Jurnal Natural Volume 15, Number 1, March 2015
Publisher : Universitas Syiah Kuala

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Abstract

One factor that is often happened is the learning objectives are difficult to achieve, because students often make mistakes in understanding the concepts and performing calculations. One way that teachers can do to minimize these errors is to classify between students who have been able to master the material and students who have not been able to master the material. Discriminant analysis is one way to facilitate the grouping of students according to their ability to master the material, by using the method of Fisher. The purpose of this study was determining how the percentage of students who have mastered the material prism and pyramid, getting the discriminant function of the prism and pyramid mastery of the material, and determining the factors that cause students difficult to understand the material prism and pyramid. The study population was the entire eighth grade students of SMP Negeri 1 Banda Aceh while the sample were students of class VIII-8 to 30 students. Based on the research that has been done using the fisher discriminant analysis method, 33.3% of students have mastered the material geometry and 66.6% of students have not mastered the material prism and pyramid. It means that from 30 students only 10 students were able to master the material well-prism and pyramid. End function that is formed is Y1 = 5,487X1 + 3,373X2 - 4,822X3 + 5,936X4 + 1,544X5 - 2,108X6 and Y2 = 5,486X1 + 3,373X2 - 4,823X3 + 5,937X4 + 1,544X5 - 2,107X6. 
Habitat Characteristics of Small-clawed Otter (Aonyx cinereus) in Ujong Nga, Samatiga,West Aceh Abdullah Abdullah; M Ali S; Hansri Ar Rasyid
Jurnal Natural Volume 15, Number 1, March 2015
Publisher : Universitas Syiah Kuala

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Abstract

Small-clawed otter (Aonyx cinereus) is the smallest among the sub-family Lutrinae, today occurs population decrease of small-clawed otter caused by human activity, depletion of prey species, and exploitation. This research is done to learn physically and biologically of the habitat characteristic of small-clawed otter. Retrieval of data was held on 1-14 in April 2014. The parameters which used are the amount of tracks found in habitat that is used by the small-clawed otter in Ujong Nga village. The data is collected on small-clawed otter habitat in Ujong Nga and sample used are plot with measure of 30x30m and then  divided into 8 plots. The result showed that the small-clawed otter selecting habitat unit with criteria (a) the type of habitat are field, swamp, thatch forest, and riverside; (b) the availabilty of many feed (1,33 tracks per plot), rare (0,33 tracks per plot), less (0,17 tracks per plot); (c) the tracks distance to the nest 0-25 m (1,66 tracks per plot), 25-50 m (1 tracks per plot), 50 m (0,5 tracks per plot); (d) the tracks distance to water source 0-25 m (2,16 tracks per plot), 25-50 m (0,5 tracks per plot), and for distance to 50 m track is not found; and(e) the tracks distance to toilet site0-25 m (1,16 tracks per plot), 25-50 m (0,5 tracks per plot), and 50 m (0,17 tracks per plot). The conclusion of this research habitat characteristic ofAonyx cinereusare fieldwithavailability of many feed, close to water source, clost to nest, and close to toilet site.
Risk Analysis Characteristic, Socio- Economic, Behavior, and Environmental Factors of Malaria Incidence in Arongan Lambalek, West Aceh Susy Sriwahyuni S; Rinidar Rinidar; Sugito Sugito
Jurnal Natural Volume 15, Number 1, March 2015
Publisher : Universitas Syiah Kuala

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Abstract

Malaria is  an infections disease of global concern, The subdistrict of Arongan lambalek in Aceh Barat district which belongs to the Medium Incidence Area category was a malaria endemic area with API with 3,67 at 1000  Population in 2013. The Annual Parasite Incidence was higher than National Parasite Malaria Incidence than is less API  1 at 1000 population. The aim of the study was to analyze the characteristic, socio-economic, behavioral, environmental factors to determine the influence of malaria incidence in Arongan lambalek sub district, Aceh Barat regency. This study was designed as case control or retrospective. As the case of the study, there were thirty-three (33) malaria positive people were involved. Laboratory test or rapid diagnostic test  was employed to select 33 respondents from malaria negative. Thus, make totally 66 respondents. The result of this study shows that there are five variables are risk factors for the incidence of malaria such as occupation (p-value =0,000, OR = 0,05), knowledge (p-value =0,000, OR =  17,5), attitude (p-value =0,001, OR = 7,43), action (p-value = 0,000, OR =  9,8) and  environment (p-value =  0,000, OR =  9,0). The result of multivariate analysis shows that knowledge is the risk factor with the most dominant influence on the incident of malaria (p = 0,006, OR=12,783, Confidence interval (CI) 95% =2,045– 79,893). Need for outreach to the community about malaria do this more often for more knowledge and and society information.

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