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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 457 Documents
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Coconut oil effect on the hygroscopic properties of Simalambuo wood (Lophopetalum spp.) LIVER IMAN PUTRA ZAI; SAHARMAN GEA; MARPONGAHTUN MARPONGAHTUN; EDDYANTO EDDYANTO; NUR AZIZAH; APRI H SISWANTO
Jurnal Natural Volume 22 Number 2, June 2022
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v22i2.24158

Abstract

Simalambuo (Lophopetalum spp) trees are endemic to Southeast Asia and widely grow in the natural forests in Nias island. Local people whose experience of utilizing the simalambuo wood have claimed that the wood easily absorbs water. Throughout our searches, not many efforts to modify the physical properties of the simalambuo woods have been carried out yet. Therefore, in this study, we modified simalambuo wood by thermal treatment in coconut oil-ambient conditions. The heat treatment became an option to support the efforts in reducing the use of non-environmental-friendly materials and methods. The simalambuo wood was treated under coconut oil at 130-210oC for 6 hours. Coconut oil uptake was up to 174%, while the leaching test (AWPA E-06 standard) showed the uneasily permeate out from the wood and high retention differently in terms of treatment and cooling temperature. Heat treatment with coconut oil affected water absorption ability and improved dimensional stability of simalambuo wood. Water absorption reduced from 162% to 16%, and dimensional stability increased from 8.4% to 4.2% at 192 hours after being soaked in water. The higher the difference between treatment and cooling temperature, the better-affected water absorption ability was and the higher dimensional ability could be achieved.
CULTIVATION CONDITIONS FOR PROTEASE PRODUCTION BY A THERMO-HALOSTABLE BACTERIAL ISOLATE PLS A Teuku M. Iqbalsyah; Malahayati Malahayati; Atikah Atikah; Febriani Febriani
Jurnal Natural Volume 19, Number 1, February 2019
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v19i1.11971

Abstract

Polyextremophiles have increasingly been utilised to produce thermostable enzymes with better stability in multiple extreme conditions. This study reports the screening results of four new bacterial isolates (PLS A, PLS 75, PLS 76 and PLS 80), isolated from an under water hot springs, in producing thermo-halostable protease enzyme. Optimum cultivation conditions for the protease production were also studied. Screening of protease-producing isolates was conducted using Thermus solid medium enriched with 3% skim milk and 0.5% casein. The growth of the isolates showing protease activity was monitored by measuring the cell dry weight and protease activity during 24 h cultivation period. The activity was also measured at various cultivation conditions, i.e. temperature, pH and salt concentrations. Amongst the four isolates, only PLS A showed the ability to produce protease. The optimum cultivation conditions for protease production were observed at 65°C, pH 7 for 18 h incubation. The activity increased with the addition of 1% NaCl concentration (0.085 Unit/mL). The ability of PLS A isolate to produce thermo-halostable protease was encouraging as they could potentially be used in industries requiring the enzyme with multiple extremes. 
Genetic diversity of Ulva lactuca from the intertidal zone in Ulee Lheue beach Aceh, Indonesia HAYATI, RAHMAH; RAHLY, FAWWA
Jurnal Natural Volume 24 Number 1, February 2024
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v24i1.33972

Abstract

Ulee Lheue Beach in Banda Aceh was developed for tourism. The macroalgae and seaweed species found in this area have been widespread but never exploited. Among these species is the green seaweed, Ulva lactuca, commonly known as sea lettuce. The physiological variations and genetic features of the seaweed can be attributed to the variations in the coastal environment. This study aims to describe the molecular identity of the genetic diversity of U. lactuca from the intertidal zone at Ulee Lheue Beach. The development of molecular biotechnology has enabled identification the gene expression through genomic DNA to PCR amplification. Genetic distance was determined using UPGMA. The results from 600-bp fragments were analyze the genetic diversity. A total of 15 (31%) expression identified as polymorphic (0.500). Heterozygosity (He) and allelic differential (Na) diversity were found of 1.5003.000. The highest PIC was observed in the rbcL1, with a correlation between subpopulations of 0.459. PCR amplification using the degenerate primer rbcL1 produced fragments ranging from 300 to 460 bp, whereas the expression of UL2 was detected at 448 and 500 bp using the rbcL2 primer. The phylogenetic identify are shown two (2) clusters. The populations of UL1, UL3, and UL4 were found a close relationship. Furthermore, the UL1 and UL2 populations were further divided into distinct clusters but related to the main branch of UL3. Based on this research, the concern of U. lactuca species for industrial and biotechnology destinations, we can describe a suitable method for obtaining he genetic distances between species.
Analysis of radon concentration and gamma dose rate in residential houses of Ambon and Seram Islands, Maluku WAHYUDI WAHYUDI; ILMA DWI WINARNI; MUJI WIYONO; KUSDIANA KUSDIANA
Jurnal Natural Volume 21 Number 1, February 2021
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v21i1.18140

Abstract

Radon concentration analysis in the residential houses on Ambon and Seram Island - Maluku through the passive method using the CR-39 nuclear track detector has been studied. The CR-39 nuclear track detector was installed inside the residential houses for 3 months. After finishing the exposure, the detector was taken and etched using 6.25 N NaOH solution. The nuclear track of radon in the CR-39 was read by a microscope with 400 times magnification. From the results of reading the track, determination of radon concentration in the houses was calculated. The results of the analysis showed that radon concentrations in the residential houses of Ambon and Seram Islands, Maluku at the low level were in the range of 2.56 ± 0.18 Bq/m3 to 59.65 ± 4.22Bq/m3 with an average value of 28.42 ± 1.98 Bq/m3. The average concentration of radon is still below the average radon concentration in the world of 50 Bq/m3. The value of dose received by the population due to exposure of radon and gamma radiation in the range of 0.90-1.44 mSv/year. There is a positive correlation between radon concentration value and total radiation doses received by the population for a year. This data can be used in the study of radiation safety for the Ministry of Health and as a contribution to Indonesia in the international community about monitoring environmental radiation from radon concentrations in residential houses
DETERMINATION OF VITAMIN C IN SEVERAL VARIETIES OF MELON FRUITS BY TITRATION METHOD Nerdy Nerdy
Jurnal Natural Volume 17, Number 2, September 2017
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v17i2.8255

Abstract

Abstract. Vitamin C (ascorbic acid) is micronutrient that is water soluble and indispensable for the body's metabolism, also plays a role in immune function. Vitamin C are easy to be absorbed actively. One of the fruits that contain vitamin C is melon fruit. Many varieties of melon fruit affect the vitamin C levels. The levels of vitamin C can be determined by 2,6-dichloroindophenol titration method using 2,6-dichloroindophenol solution. The advantages of the 2,6-dichloroindophenol titration method in the determination of vitamin C levels is reductor substances other than vitamin C are not oxidized by 2,6-dichloroindophenol. The examination begins with the determination of equivalence of 2,6-dichloroindophenol solution to vitamin C and followed by determination of vitamin C levels in several varieties of melon fruit. Equivalence of 2,6-dichloroindophenol solution to vitamin C was obtained 0,1347 mg vitamin C per 1 mL 2,6-dichloroindophenol solution. Levels of vitamin C in various varieties of melon fruit obtained that the highest levels was in Golden Melon variety (9,209 mg vitamin C per 100 g of Golden Melon) while the lowest levels was in Langkawi Melon variety (0,335 mg of vitamin C per 100 g of Langkawi Melon). It can be concluded that vitamin C levels contained in melon fruit vary and depend on melon fruit varieties.Keywords: Vitamin C, Ascorbic Acid, Melon Fruits, Varieties, Titration MethodREFERENCE S. Almatsier, 2001, Prinsip Dasar Ilmu Gizi, Gramedia Pustaka Utama, Jakarta, 152-153, 185-186.F. Prajnanta, 2003, Melon: Pemeliharaan secara Intensif dan Kiat Sukses Beragribisnis. Penebar Swadaya, Jakarta, 3, 30.R. Rukmana, 2007, Melon Hibrida, Kanisius, Yogyakarta, 11, 13-15, 16.B. Samadi, 2007, Melon: Usaha Tani dan Penanganan Pascapanen, Kanisius, Yogyakarta, 19, 23, 25-28, 31.P.M. Wijoyo, 2009, Panduan Praktis Budi Daya Melon, Bee Media Indonesia, Jakarta, 14-17, 55.I.G. Gandjar, dan A. Rohman, 2007, Kimia Farmasi Analisis, Pustaka Pelajar, Yogyakarta, 249.N. Andarwulan, dan S. Koswara, 1992, Kimia Vitamin, Rajawali Press, Bogor, 14-20, 32-35, 235.Direktorat Jenderal Pengawasan Obat dan Makanan Departemen Kesehatan Republik Indonesia, 1995, Farmakope Indonesia, Edisi Ke-4, Departemen Kesehatan Republik Indonesia, Jakarta, 1215-1216.W. Horwitz, 2002, Official Methods of Analysis of Association Offical Analytical Chemist Internasional, Edisi Ke-42, Association Offical Analytical Chemist International Suite, Maryland, 16-17.10. J.N. Counsell, and D.H. Hornig, 1981, Vitamin C, Applied Science Publisher, London, 123-124.11. R.M. Astrid, 2016, Cara Cerdas Berkebun Emas Dengan Menanam Melon, Villam Media, Depok, 67. 
MEMBRAN POLIURETAN DARI MINYAK BIJI KARET (RUBBER SEED OIL) DENGAN HEKSAMETILEN-1,6-DIISOSIANAT: SINTESIS Salfauqi Nurman; Marlina Marlina; Saiful Saiful
Jurnal Natural Volume 16, Number 1, March 2016
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v16i1.4705

Abstract

Polyurethane membrane made from Rubber Seed Oil has been produced within this research. Rubber seed oil has the hydroxyl number of  40,33 mg/g  and the iodine number of  154,05 g/g which can be used as resource clusters; -OH, in order to make polyurethane. Rubber seed oil can react with hexamethylene-1.6-diisocyanate (HDMI) as another resource cluster, which is -NCO. The production of polyurethane membrane is done by variating the composition of rubber seed oil and HDMI, with the variations of 5:1; 5:3; 5:4; 5:5 dan 5:7 (v/w) and the polymrization temperature of 90-100°C and the curring temperature of  165-170°C. The optimal polyurethane membrane is produced on the composition of 5:4 v/w  which is homogenous, dry, quite elastic and is yellowish brown in colour. The IR results showed that there were urethan bonds formed (N-H on  ν = 3300-3400 cm-1) and the TGA results from polyurethane membrane showed that there were two decompositions on 394,5oC dan 458,6oC.
DISTRIBUTION MAPPING OF GLYPHOSATE-RESISTANT Eleusine indica IN SERDANG BEDAGAI REGENCY Koko Tampubolon; Edison Purba; Mohammad Basyuni; Diana Sofia Hanafiah
Jurnal Natural Volume 18, Number 3, October 2018
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v18i3.11201

Abstract

The presence of Eleusine indica from oil palm plantations in Serdang Bedagai Regency has never been overall reported glyphosate-resistant. This study aims to distribution mapping and resistance classification of E. indica population to glyphosate herbicide of oil palm plantations in Serdang Bedagai Regency. This research was conducted on Weed Research Center Land in Faculty of Agriculture, Universitas Sumatera Utara in October 2016 to August 2017. This research used glyphosate herbicide with the recommended dose at 720 g ai ha-1 and three replications. Population ESU0 (from Politeknik Negeri Medan Ball Field) as a comparison. Data analysis using IBM SPSS Statistics 20 software. The results showed there E. indica population classified as glyphosate-resistant amount 89.36% (42 population), classified as glyphosate-resistant moderate amount 10,64% (5 population) and there is no population glyphosate-susceptible on oil palm plantations in Serdang Bedagai Regency of recommended dose at 720 g ai ha-1.
Relationship between seismic acoustic impedance (AI) and total organic carbon (TOC) content: a case study from Australia MUHAMMAD RIDHA ADHARI; MUHAMMAD YUSUF KARDAWI
Jurnal Natural Volume 23 Number 3, October 2023
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v23i3.30980

Abstract

. Shale gas has become of interest of geoscientists globally because of its potentials to expand our energy supply. This research used well logs data and total organic carbon (TOC) data from Perth and Canning Basins, Australia. The objective of this research is to investigate source rock potential of the study area by examining the relationship between TOC content and seismic acoustic impedance (AI) derived from well log data, using regression analysis. The outcomes of this research show that for claystone/siltstone, the relationship between AI and TOC is nonlinear, while for shale the correlation is linear. However, there is no fixed equation that can be used as a standard for this linear/nonlinear relationship. Results show that for a certain type of lithology, the relationship between TOC and AI is different for different formations. This is interpreted to be caused by different depositional environment, diagenesis, mineralogical composition and different depth of burial. Findings of this study are expected to provide some new insights into the relationship between AI and TOC for various types of lithology and contribute to shale gas exploration studies.
Microwave Assisted Co/SiO2 preparation for Fischer-Tropsch synthesis TEUKU MUKHRIZA; KUI ZHANG; ANH N. PHAN
Jurnal Natural Volume 20 Number 2, June 2020
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v20i2.16889

Abstract

Cobalt catalyst has been widely used for Fischer-Tropsch (FT) Synthesis in Industry. The most common method to prepare cobalt catalyst is impregnations. Metal is deposited on porous support by contacting dry support with solution containing dissolved cobalt precursor. This step will follow by drying, calcination and reduction. The heating step used in this conventional method, however, may lead to the formation of metal silicate which is inactive site for catalysis.  In this study, author explore the use of microwave to prepare catalyst compared to conventional drying method. Cobalt catalyst with SiO2 support was prepared and characterized. Particle size, surface area, and cobalt content were investigated. Crystallite size of 3-8 nm was formed which was reported to be the optimum size for cobalt catalyst in FT Synthesis. Scanning Electron Microscope (SEM) and Transmission Electron Microscopy (TEM) image revealed that microwave catalyst showed better uniformity and cobalt dispersion on silica support. Thermo-Gravimetric Analysis (TGA) study also indicated that this catalyst has good stability at Low Temperature Fischer-Tropsch Synthesis. The catalysts were then applied plasma assisted FT process over a range of power plasma (20-60W) to investigate the effect on the conversion and selectivity. The results showed that microwave catalyst exhibit lower CO conversion at 42.06% compared to conventional method at 68.32%. However, microwave catalyst is more favourable for long chain hydrocarbon selectivity.
ACTIVITY TEST OF Abrus precatorius L. LEAF EXTRACT AGAINST CLINICAL Streptococcus pneumonia GROWTH* Misrahanum Misrahanum; Cut Intan Annisa Puteri; Cut Yulvizar
Jurnal Natural Volume 17, Number 1, March 2017
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v17i1.7260

Abstract

Abstract. Saga (Abrus precatorius L.) have been used by Indonesian community as a traditional medicine. The research aims to determine the activity of the methanol extract of saga leaves to inhibit the growth of clinical Streptococcus pneumoniae growth. Inhibition tests was done with casting cup method. The results showed that the methanol extract of saga leaves at a concentration of 37,5; 50; 62,5; 75 and 87,5 mg/mL formed growth inhibition zone of clinical S. pneumoniae with consecutive average of 0,5; 1,75; 2,82; 4,00; and 4,82 mm. Based on the results of the research can be concluded that the methanol extract of saga leaves had activity in inhibiting the growth of clinical S. pneumoniae isolates with low category.  Key words: Abrus precatorius L., Clinical Streptococcus pneumoniae, Methanol extract*Judul ini telah dipresentasikan pada Seminar Nasional: Indonesian Students Conference on Science and Mathematics(ISCSM) 11-12 November 2015, Banda Aceh Indonesia

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