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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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GOOGLE MAPS AND MAPBOX API PERFORMANCE ANALYSIS ON ANDROID-BASED LECTURE ATTENDANCE APPLICATION Kurnia Saputra; Muhammad Furqan; Taufik Fuadi Abidin; Dalila Husna Yunadi
Jurnal Natural Volume 19 Number 3, October 2019
Publisher : Universitas Syiah Kuala

Attendance is an inseparable component from lectures. The current manual attendance process still has its weaknesses, such as the loss or broken attendance sheets, the easiness to conduct fraud on the attendance sheets, and other cases. The attendance system using fingerprint devices are also not available in other locations yet, such as lectures that are done on the field or outdoor, where fingerprint devices are not available. Because of that, an online lecture attendance system that makes use of Android-based smartphones is developed in order to tackle the problem. This online lecture attendance system has the main feature of recording students’ attendances in a radius of 300 metres from the lecturer. This application is named Lecture Attendance System is developed using Rapid Application Development (RAD) model, because it is an effective method to minimise errors in the application. There are two testing performed to the application. The first testing was functional testing of the application. This testing was carried out in order to make sure that all functionalities and features are performing well. The second testing carried out is the distance accuracy testing, to compare between the Google Maps and MapBox API distances. From this testing, it was found that the error percentage using Google Maps is 9.250% and 12.128% for MapBox. From these results, they show that in calculating the distance, using Google Maps API has higher accuracy compared to the MapBox API.

CHARACTERISTIC SYMPTOMS OF Phytophthora palmivora ON COCOA LEAVES Rina Sriwati; Rizky Muarif
Jurnal Natural Volume 12, Number 2, September 2012
Publisher : Universitas Syiah Kuala

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The research was aimed to determine the characteristics symptoms of Phytophthora palmivora on cocoa leaves, and was conducted in Plant Diseases Laboratory, the Faculty of Agriculture Syiah Kuala University. Mature cacao leaves with almost the same size in the quotation were used at Lab. Plant disease. Suspensions of P. palmivora were inoculated on leaves by spraying techniques with several concentrations of treatment, 1x102, 1x104, 1x106. The results showed that cocoa leaves’ symptoms were getting yellow colour around the veins and the whole leaves eventually showed lesion on the third day after spraying. The higher spores’ population of P. palmivora could impact higher invasive infections. Characteristic symptoms will be very helpful in the process of observation of early disease in the nursery.

Optimizing the gonadal performance of broodstock Helostoma temminckii with addition of enrichment ingredients in feed INDIRA FITRILIYANI; SISWANTO SISWANTO; LUCHAS LUCHAS
Jurnal Natural Volume 22 Number 1, February 2022
Publisher : Universitas Syiah Kuala

The problem in the development of Kissing gourami fish culture was quality seeds that cannot be available continuously. Purpose of this research was to examine the need for additional enrichment materials in feed that can optimize the process of gonad maturation of Kissing gourami fish. Treatment A=Commercial feed added with Vegetable Oil, Glutathione, and Egg White; B=Commercial feed added with Vegetable Oil, Vitamin E 300 mg/Kg, Glutathione, and Egg White; C=Commercial feed added with Vegetable Oil, Vitamin E 500 mg/Kg, Glutathione, and Egg White. and D=Commercial feed added with Vegetable Oil, Vitamin E 700 mg/Kg, Glutathione, and Egg White. The results showed that all treatments with the addition of glutathione and vitamin E fortifications with levels of 300 mg-700 mg gave the effect of increasing IGS, IHS, higher fecundity and larger egg diameter than treatment A. The amount of initial IGS increase in treatment A was 33.49%, treatment B was 172.52%, treatment C was 208.60% and treatment D was 691.20%. While the IHS value at the end of the study decreased in treatment A by 35.30% and treatment C which also experienced a decrease in IHS by 26.23%. While in treatments B and D there was a not too large increase, in the range of 42.56% (B) and 5.66% (D).

SYNTHESIS AND CHARACTERIZATION OF TiO2/α-Fe2O3 COMPOSITE USING HEMATITE FROM IRON SAND FOR PHOTODEGRADATION REMOVAL OF DYE Surya Lubis; Ilham Maulana; Masyithah .
Jurnal Natural Volume 18, Number 1, February 2018
Publisher : Universitas Syiah Kuala

In this paper, TiO2/α-Fe2O3 composite with high photocatalytic activity was prepared by a mechanical milling using iron sand from Lampanah in Aceh Besar regency as hematite (α-Fe2O3) source. Hematite was extracted from iron sand by using hydrochloric acid followed by co-precipitating using ammonium hydroxide as co-precipitation agent. Hematite and TiO2 powder were mixed and milled on a planetary ball mill without incorporating any solvent. The materials were characterized by using X-ray difraction (XRD) and scanning electron microscopy energy dispersive x-ray spectroscopy (SEM-EDX). The XRD results showed that the iron (III) oxide synthesized was hematite (α-Fe2O3) phase with the average crystallite size 27.967 nm. SEM analysis showed that iron sand was on irregular form, while the hematite (α-Fe2O3) and TiO2/α-Fe2O3 composite was on regular sphere. The TiO2/α-Fe2O3 composite was evaluated on photodegradation of indigo carmine (IC) dye using UV light irradiation. The highest degradation efficiency of IC (100%) was obtained by initial pH of dye solution equal to 1, photocatalyst dosage of 0.2 g, initial dye consentration of 5 mg/L for 120 min irradiation time. The photocatalytic activity of TiO2/α-Fe2O3 composites using UV light was almost the same as that of by solar light. Keywords: Iron sand, α-Fe2O3/TiO2 composite, mechanical milling, photocatalyst, indigo carmine

Study of white frangipani flower and bitter grape stem ethanol extract combination on antibacterial and antioxidant activities KRISHNA PURNAWAN CANDRA; WIJAYANTI KUSUMA WARDHANI; ANTON RAHMADI; MIFTAKHUR ROHMAH; YULIANI YULIANI
Jurnal Natural Volume 20 Number 3, October 2020
Publisher : Universitas Syiah Kuala

Frangipani flower (Plumeria acuminata) and bitter grape (Tinospora crispa L. Miers) stem extract alone shows antimicrobial and antioxidant activities. However, there is a limited report about the actions from the combination of both extracts. Combinations of ethanol extract of white frangipani flower (EFF) and ethanol extract of the bitter grape stem (EBS), each of 0, 1, 2, and 3% were tested for inhibition against Staphylococcus aureus growth and DPPH (1,1-diphenyl,2-picrylhydrazyl) free radicals. A yield of 3.17 and 2.62 g of EFF and EBS, respectively, were resulted from 100 g of dried powdered of the white frangipani flower and bitter grape stem using 200 mL of absolute ethanol. The antimicrobial test was assayed using a 10% stock solution of extract diluted in water. The combination of EFF and EBS showed a synergistic effect on antimicrobial activity, but it proved an antagonistic effect on antioxidant activity. The combination of EFF 3% and EBS 3% showed the highest inhibition index on the S. aureus growth , i.e. 2.02±0.06, which is higher than the inhibition index of Amoxycillin 2%, i.e. 1.85±0.09. The highest antioxidant activity showed by 1% EFF alone (57.5 ± 0.60%), while the lowest was from the combination of EFF 1% and EBS 3% (23.4±0.30%).

WOUND HEALING ACTIVITY OF UNGUENTUM DOSAGE FORM OF ETHANOLIC EXTRACTS OF Areca catechu L. NUT IN Mus musculus albinus Azizah Vonna; Rizky Nurismi; Misrahanum .
Jurnal Natural Volume 15, Number 2, September 2015
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (198.937 KB)

The activity test of ethanol extract of betel nut ointment (Areca catechu L.) in wound healing on mice (Mus musculus albinus) has been carried out to determine the ability of the ethanol extract of betel nut ointment in wound healing and determine the concentration which was accelerate the wound healing on mice between 2 concentrations. This experimental research method used completely randomized design (CRD) using 20 mices divided into 4 treatment groups ; ointment base, povidone iodine ointment, ethanol extract of betel nut ointment (SEEBP) 2% and SEEBP 4%. Each treatment groups was tested in the incision which was made along the 15 mm parallel to the spine (Os. Vetebre) with the depth until subcutaneous skin layers. The ointment was applied twice a day for about 21 days and observed changes every day for during the period of observation. The results showed that the average length of time of the scab formation, the scab exfoliation, and the wound healing successively are for the ointment base was 6.6; 10.2 and 18.2 days, povidone iodine ointment was 7; 11.2 and 14.8 days, SEEBP 2% was 5.75; 7.75 and 13.25 days, SEEBP 4% was 4.2; 8.8 and 12.8 days. ANOVA and LSD results of scab formation time showed a significant difference between SEEBP 4% with base ointment and povidone iodine ointment (p 0.05). Results of the exfoliation scab showed a significance difference between SEEBP 2% with base ointment and povidone iodine ointment (p 0.05). The duration of wound healing showed that there was significance difference between SEEBP 2%, SEBP 4% and povidone iodine ointment with ointment base (p0.05).Thus, betel nut ointment as an effect on healing process. The concentration which can accelerate wound healing in mice is SEEBP 4%.

Evaluation of Vegetables Shelf Life Using Multispectral Scattering Method Faisal Abdullah
Jurnal Natural Volume 14, Number 1, March 2014
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (214.633 KB)

This study was aimed to develop an algorithm based on the optical properties of some selected vegetables which can be used to evaluate shelf- life of some selected vegetables using multispectral scattering method. Multispectral algorithm will be developed to correlate light backscattering radiation of a vegetable with the level of shelf life conditions. The partial least square (PLS) regression models using three wavelengths were used to estimate the shelf life changes of the vegetable samples. The results showed that the developed multispectral scattering algorithms can be used to evaluate the shelf life changes of Chinese cabbage, carrot, chili, and cucumber using wavelengths at 880, 890, and 950 nm as the light sources respectively. The calibration and validation processes of the algorithm produced good accuracy measurements as represented by high R2 values and low Root Mean Square Error (RMSE). For the Chinese cabbage and the carrot samples, the algorithm was not effective to predict the changes of the shelf life because the responses was kept increasing even after the samples were dried and deteriorated. Also, the algorithms cannot be used to evaluate the shelf life changes of the onion because the calibration and validation processes produced low accuracy of measurements.

Mammals’ abundance in Lingga Isaq Hunting Park Landscape, Aceh CUT MAILA HANUM; MA’RIFATIN ZAHRAH; MALAHAYATI DAUD; ROZZA TRI KWATRINA
Jurnal Natural Volume 22 Number 3, October 2022
Publisher : Universitas Syiah Kuala

Hunting-park is a conservation area with the unique attraction of periodically hunting in terms of wildlife management. Lingga Isaq Hunting-Park (LIHP) is one of 13 hunting parks in Indonesia. However, the utilization of LIHP as a hunting park is still facing obstacles; two of which are conflicts of interest among authorities and no data of the animals, especially mammals – the most hunted creatures in the park. Therefore, a study was conducted to identify the mammalian abundance and distribution. This data would be usefull as essential decision-making for hunting-tourist attractions in LIHP. This study used the transect method, with 12 transect strips evenly distributed in those four function areas; three per each. We found 11 species of mammalian that belonging to 8 families. The protected forest had the highest biodiversity value (H’=1.50), while other use areas had the lowest biodiversity value (H’=1.16). Macaca fascicularis had the highest abundance (23 individu), while Sus scrofa was the most evenly distributed mammal in the whole landscape. Protected forests and other utilization areas have the highest habitat similarity, identified as having intense anthropogenic activities. The protected forest also has habitat similarity with hunting-park as both areas are legally protected. Nevertheless, there are only Cervus unicolor, Muntiacus muntjak, and Sus scrofa that are highly recommended for hunting tourism attractions.

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

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.

THE SUBSURFACE RESISTIVITY STUDIES IN GAMPONG JAWA WASTE DISPOSAL BANDA ACEH Fadhli Syamsuddin; Marwan Abu Bakar; Nur Mala
Jurnal Natural Volume 12, Number 1, March 2012
Publisher : Universitas Syiah Kuala

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The research has been carried out about determining the subsurface resistivity values by using the VLF method in waste disposal (TPA) Gampong Jawa Banda Aceh. Measurement target is for investigate allegations of contaminant substances are disposed by the public at these locations based on the response of the magnetic and electric fields. The tools used are the T-VLF device with two electrodes and using three stations, namely the transmitter JJF4 Japan, NWC Australia and UMS Moscow. Broad expanse of measurements on L1 and L2 is 200 m, L3 and L4 is 150 m. There are 74 measuring points with spacing of 10 m. The result of this experiment showed that the four layers can be divided into two layers with different resistivity values. The first layer at a depth of 0-15 m with apparent resistivity of 2-25 Ωm, allegedly at this layer contained the contaminant substances. The second layer at a depth of 15 m with apparent resistivity of 25-101 Ωm, in this layer are water-resistant coating that can withstand water into and out of the landfill.

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Suhartono

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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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