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Jurnal Natural

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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 457 Documents

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Resistance status and physiological responses of Dactyloctenium aegyptium to diuron herbicide in pineapple plantation RESTI PUSPA KARTIKA SARI; NANIK SRIYANI; YUSNITA YUSNITA; HIDAYAT PUJISISWANTO
Jurnal Natural Volume 22 Number 3, October 2022
Publisher : Universitas Syiah Kuala

Diuron herbicide has been used in the pineapple plantation in Lampung, Indonesia, for more than 35 years. It has been realized that the use of herbicides with the same mode of action intensively can speed up the evolution of resistant weeds over a long period of time. This study aimed to determine whether Dactyloctenium aegyptium from pineapple plantation has evolved resistance to diuron and to examine whether the resistance correlates with the weed physiological activities. The study was conducted at the University of Lampung, from September 2018 to March 2019. The study consisted of two stages, i.e. Stage 1: Weed resistance test and Stage 2: Physiological activity test on resistant weed. The study used a split-plot design. The main plot was the origins of weeds (exposed and unexposed to diuron) and thhe supplots was the diuron dose. The result showed that D. aegyptium exposed has high-level resistance to diuron. The physiological activities of D. aegyptium which has a high level of diuron resistance exhibited higher carbon assimilation, stomatal conductance, and transpiration rates than the sensitive D. aegyptium.

POPULATION STRUCTURE OF DIPTEROCARPACEAE SPECIES IN KETAMBE RESEARCH STATION, GUNUNG LEUSER NATIONAL PARK, ACEH TENGGARA Rizki Amelia; Saida Rasnovi; Essy Harnelly
Jurnal Natural Volume 19, Number 1, February 2019
Publisher : Universitas Syiah Kuala

Ketambe Research Station is one of the oldest and most complete stations in the world which has abundant biodiversity. The Dipterocarpaceae is one of the family identified as growing in the forest area of Ketambe Research Station. Ecologically, Dipterocarpaceae has several limiting factors for its growth and distribution and the most determining factors are soil factors and climate. Dipterocarpaceae is also known as nest and source of food for orangutans, namely Shorea spp. Therefore, it is necessary to conduct research that aims to determine the population structure of Dipterocarpaceae species in Ketambe Research Station. The method used Quadrat Sampling Technique. Theplacement of the sampling plot was randomly carried out in 25 plots with an area of 1 ha. The result showed that there were three species of Dipterocarapaceae found in this station i.e., Parashorea lucida, Shorea johorensis and Hopea dryobalanoides. Based on the population structure pyramid, P. lucida will survive and develop in the future S. johorensis and H. dryobalanoides, on the other hand, are estimated to decrease or hardly survived in the future.

MIXED MATRIX MEMBRANE ADSORBERS FOR GLYCEROL REMOVAL IN BIODIESEL Saiful Saiful; Febrina Pratiwi; Ilham Maulana; Muliadi Ramli
Jurnal Natural Volume 12, Number 1, March 2012
Publisher : Universitas Syiah Kuala

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Mixed matrixmembrane (MMM) adsorbers systems function as short and wide chromatographic columns in which the adsorptive packing consists of one or more micro-porous membranes. This study reports the use of membrane adsorbers for glycerol capturing and removing in crude biodiesel. The MMM are prepared by a wet phase inversion method. Magnesol were incorporated as active sites in the membrane. Matrix support of the membrane was prepared from chitosan.The optimum compositions of the adsorptive membranes were 3 % chitosan, 15% DMF and 60% loading adsorbent. The porosity of these membranes was 34 % and swelling degree was 52 %. The membrane clean water flux was 225 Lm-2h-1 at a trans-membrane pressure of 2.5 bar. The adsorptive membrane has been demonstrated to reduce the concentration of total glycerol in crude biodiesel. The amount of glycerol in biodiesel can be reduced 69.93 % in 60 minute which is agreed to value of SNI quality standards. The membrane adsorber can be regenerated and reused for biodiesel purification. The regenerated membrane can be reused with maintaining the high adsorption capacity. The methanol was better than ethanol to regenerate the magnesol membrane. The Magnesol membrane will be a new alternative method for biodiesel purification.Mixed matrixmembrane (MMM) adsorbers systems function as short and wide chromatographic columns in which the adsorptive packing consists of one or more micro-porous membranes. This study reports the use of membrane adsorbers for glycerol capturing and removing in crude biodiesel. The MMM are prepared by a wet phase inversion method. Magnesol were incorporated as active sites in the membrane. Matrix support of the membrane was prepared from chitosan.The optimum compositions of the adsorptive membranes were 3 % chitosan, 15% DMF and 60% loading adsorbent. The porosity of these membranes was 34 % and swelling degree was 52 %. The membrane clean water flux was 225 Lm-2h-1 at a trans-membrane pressure of 2.5 bar. The adsorptive membrane has been demonstrated to reduce the concentration of total glycerol in crude biodiesel. The amount of glycerol in biodiesel can be reduced 69.93 % in 60 minute which is agreed to value of SNI quality standards. The membrane adsorber can be regenerated and reused for biodiesel purification. The regenerated membrane can be reused with maintaining the high adsorption capacity. The methanol was better than ethanol to regenerate the magnesol membrane. The Magnesol membrane will be a new alternative method for biodiesel purification.

Study of Medicinal Plants in the Geothermal Area of Mount Seulawah Agam, Aceh Besar District, Indonesia MUHAMMAD DOUDI; SAIDA RASNOVI; DAHLAN DAHLAN; HENDRIX INDRA KUSUMA; MUSLICH HIDAYAT
Jurnal Natural Volume 21 Number 3, October 2021
Publisher : Universitas Syiah Kuala

The area of mount Seulawah Agam is an area of active volcano paths that impact the appearance of volcanic symptoms, that will affect the species of plants that grow in the area. This study aims to determine the potential of medicinal plant species and their diversity in the geothermal area of Seulawah Agam, Aceh Besar district. The data collection was carried out using multiple square plots placed using stratified sampling based on the soil temperature zone at a predetermined. Each area is set on four impartial actions in systematic random. The name of the species and its individual quantity of each potential plant was documented and analyzed accordingly. Then, they were analyzed based on scientific journals and identification books for medicinal plants. Data analysis was performed using importance value index and Diversity Index. The study found there were 32 species of 21 families of medicinal plants were identified started from the growth rates of seedlings, saplings, poles, and trees. The medicinal plants' diversity index analysis at each growth rate is classified into the medium category. Based on literature studies, plants' parts are commonly used as medicines such as leaves roots, sap, bark, and flowers. Utilization can be used to treat a variety of diseases and illnesses, as well as a parasitic infection. The result shows that the geothermal area of Seulawah Agam in Aceh Besar district has excellent resources and potential for medicinal plants that become used for the benefit of the surrounding community: they need to be maintained so that they still be beneficial for future generations.

SHALLOW WATER EQUATION SOLUTION IN 2D USING FINITE DIFFERENCE METHOD WITH EXPLICIT SCHEME Nuraini Nuraini; Syamsul Rizal; Marwan Ramli
Jurnal Natural Volume 17, Number 2, September 2017
Publisher : Universitas Syiah Kuala

Abstract. Modeling the dynamics of seawater typically uses a shallow water model. The shallow water model is derived from the mass conservation equation and the momentum set into shallow water equations. A two-dimensional shallow water equation alongside the model that is integrated with depth is described in numerical form. This equation can be solved by finite different methods either explicitly or implicitly. In this modeling, the two dimensional shallow water equations are described in discrete form using explicit schemes.Keyword: shallow water equation, finite difference and schema explisit.REFERENSI 1. Bunya, S., Westerink, J. J. dan Yoshimura. 2005. Discontinuous Boundary Implementation for the Shallow Water Equations. Int. J. Numer. Meth. Fluids. 47: 1451-1468.2. Kampf Jochen. 2009. Ocean Modelling For Beginners. Springer Heidelberg Dordrecht. London New York.3. Rezolla, L 2011. Numerical Methods for the Solution of Partial Diferential Equations. Trieste. International Schoolfor Advanced Studies.4. Natakussumah, K. D., Kusuma, S. B. M., Darmawan, H., Adityawan, B. M. Dan Farid, M. 2007. Pemodelan Hubungan Hujan dan Aliran Permukaan pada Suatu DAS dengan Metode Beda Hingga. ITB Sain dan Tek. 39: 97-123.5. Casulli, V. dan Walters, A. R. 2000. An unstructured grid, three-dimensional model based on the shallow water equations. Int. J. Numer. Meth. Fluids. 32: 331-348.6. Triatmodjo, B. 2002. Metode Numerik Beta Offset. Yogyakarta.

IDENTIFICATION OF SUBSURFACE STRUCTURE USING SEISMIC REFRACTION METHOD AT JANTHO ACEH BESAR Muhammad Zikrilah; Didik Sugiyanto; Ibnu Rusydy
Jurnal Natural Volume 16, Number 2, September 2016
Publisher : Universitas Syiah Kuala

An identification of subsurface structure in the surrounding area of Aceh Besar regent’s office was conducted by using seismic refraction method. The aims of this study are to determine the velocity value between layers in order to describe thesubsurface layer model, to identify the types of rocks on each layer, and to analyze the depth of bedrock layer located in the subsurface. There are 4 tracks with spaces in between each geophone, and on each track, with the width of 3 m. The total spread on the track is 72 m and the farthest shoot point is 36 m from the farthest geophone point.

The effect of organic fertilizers on the leaf morphology and stomatal density of Pogostemon cablin Benth MEUTIA ZAHARA; SUWARNIATI SUWARNIATI; QURRATU AINI; MUSLIM MUSLIM
Jurnal Natural Volume 21 Number 2, June 2021
Publisher : Universitas Syiah Kuala

Pogostemon cablin Benth is one of the most important crops grown in Indonesia, especially in Aceh province. It is well known as Patchouli belongs to Lamiaceae family and shows a great demand for perfume, luxury products, food and beverage industry. This study conducted to determine the effect of organic fertilizers application on the leaf morphology and stomatal density on the Pogostemon cablin Benth. The seedlings were transplanted for three months on the soil mixed either with manure or compost. The results obtained that was no significant different in affecting the leaf morphology of Pogostemon cablin Benth. The treatment with manure application showed the highest leaf length (15.23 cm) and the highest leaf width (10.5 cm), the leaf color is green. While the stomatal density obtained the significant difference among the treatments, the highest stomatal density in both side of the leaf surface showed in the application of manure, 663.5 mm-2 for adaxial part and 486.38 mm-2 for abaxial part. Stomatal type is anisocytic and on the leaf surface was found glandular and non-glandular trichomes.

ISOLATION OF ANTIOXIDANT COMPOUNDS OF METHANOL EXTRACT OF NUTMEG LEAVES (Myristica fragrans Houtt) Nurmilasari Nurmilasari; Binawati Ginting; Hira Helwati
Jurnal Natural Volume 17, Number 1, March 2017
Publisher : Universitas Syiah Kuala

Abstract.The antioxidant activity from methanol extract of nutmeg leaves (Myristica fragrans Houtt) was performed using 2,2-diphenyl-1-picrylhydrazil (DPPH). Antioxidant assay using DPPH of the methanol extract at a concentration of 25 ppm, 50 ppm and 100 ppm, showed high antioxidant activity with IC50 = 36.31 ppm and Vitamin C showed antioxidant activity with IC50 = 3.657 ppm. The methanol extract of nutmeg leaves were partitioned with chloroform to obtain chloroform extract of the leaves with IC50 = 28.30 ppm. isolation of the active compounds from the chloroform extract of the nutmeg leaf using column chromatography yielded 6 mix fractions MFMD 1, MFMD 2, MFMD 3, MFMD 4, MFMD 5 and MFMD 6. The test results of antioxidant activity in very strong category is fractions MFMD 4, MFMD 3, MFMD 2, MFMD 6 and MFMD 5 with IC50 of each are 26.590 ppm, 27.239 ppm, 29.639 ppm, 39.766 ppm and 55.436 ppm, while antioxidant activity in a weak catagory is fraction MFMD 1 with IC50 is 126.270 ppm. This shows that the fraction of the leaf has a better inhibitory activity, because some of the active compound contained in the fraction can synergize in inhibiting free radicals, so that the IC50 value of the fraction is stronger than the extract. Keywords: Antioxidant, chromathography, Nutmeg (Myristica fragransHoutt), methanol extract, leaves

DIVERSITY OF FEED PLANTS OF SUMATRAN ELEPHANT HABITATS (ELEPHAS MAXIMUS SUMATRANUS) IN JANTHO PINUS NATURE RESERVE, ACEH BESAR DISTRICT Ma’rifatin Zahrah
Jurnal Natural Volume 16, Number 1, March 2016
Publisher : Universitas Syiah Kuala

This research conducted to identify the kinds of feed plants sumatran elephant which is the main component of elephant habitats .The purpose of this research was to obtain data about kinds of feed plants sumatran elephant and analyzes the species diversity. The study conducted with analysis vegetation use of systematic sampling methods at any community different vegetation .The research results recorded there are 75 species of feed plants from 269 species of plants found , which means 28% plants in the study locations is a source of feed for sumatran elephants. The data was obtained show that the number of species to spread of feed plants of elephant more on a community of I , a number of 36 species of all level vegetation began to the seedling, sapling, pole and tree; while community II and III each 30 and 23 species . Community IV and V had the same number of feed plants species, a number of 31 species . Based on the analysis of the diversity of species to feed plants of elephant, shows that community III have index the diversity of species ( H = 4,53; Hmax = 5,17 ) higher than other locations.

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

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.

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

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Kab. aceh besar,

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