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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 6 Documents
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Search results for , issue "Volume 11, Number 2, September 2011" : 6 Documents clear
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

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Abstract

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.
ANTIDIABETIC ACTIVITY FROM ETHANOL EXTRACT OF KLUWIH’S LEAF (Artocarpus camansi) Marianne Marianne; Yuandani Yuandani; Rosnani Rosnani
Jurnal Natural Volume 11, Number 2, September 2011
Publisher : Universitas Syiah Kuala

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Abstract

Research on antidiabetic activity of ethanol leaf extracts Kluwih (Artocarpus camansi) has been carried out to determine the antidiabetic activity of ethanol extract of leaves kluwih (EELK) of mice using glucose tolerance test. The study began by dividing the mice into 6 groups. Group 1 was given 1% CMC, group 2 to group 4, given EELK 50, 100, 200, 400 mg / kg bw, respectively, and group 6  administered with glibenclamide 0.45 mg/kg bw. Thirty minutes later each group was given glucose 30 mg/kg bw. After 30 min of glucose loading, blood glucose levels of mice were measured, and measured again at minute 60, 90, 120 and 150 minutes. The results showed that the glucose tolerance test EELK a significant effect in lowering blood glucose levels compared to controls at 30 and 60 minutes after administration of glucose. At minute 90 to 150, the effect of blood glucose levels EELK restore back to normal. EELK demonstrated ability to reduce blood glucose levels, and EELK doses of 50 and 100 mg/kg bw showed antidiabetic effects better than a dose of 200 and 400 mg/kg bw. Increasing doses showed antagonistic effects: the ability to increase blood glucose levels.
BIODEGRADABLE PLASTICS FROM A MIXTURE OF LOW DENSITY POLYETHYLENE (LDPE) AND CASSAVA STARCH WITH THE ADDITION OF ACRYLIC ACID Susilawati Susilawati; Irfan Mustafa; Desy Maulina
Jurnal Natural Volume 11, Number 2, September 2011
Publisher : Universitas Syiah Kuala

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Abstract

A research of preparation biodegradable plastics, from LDPE and cassava starch mixture with the addition of acrylic acid, had been conducted. This research purpose to  studied compatibility properties of the material and percent weight loss during the biodegradation test. Optimum weight loss (59,26% ) was showed after 60 days witches LDPE and starch composition ratio 6 : 4 (w/w)  while tensile strength  equal to 0,38 Kgf/mm2.  SEM characterization showed that biodegradation has occurred by  formation of hole in the biodegradable plastic surface. DTA test gave Tg = 130 °C, Tm = 230 °C and Td = 370-450 °C while FT-IR analysis showed that the biodegradable plastics have a chemistry interaction.
THE EFFECT OF STORAGE TIME ON TOTAL OF FUNGI IN KANJI PEDAH Resmila Dewi; Risa Nursanty; Cut Yulvizar
Jurnal Natural Volume 11, Number 2, September 2011
Publisher : Universitas Syiah Kuala

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Abstract

The research was conducted to determine the quality of the kanji pedah by counting total number and percentage of Aspergillus flavus and Aspergillus niger. It had been done since March from to October 2010 in Microbiology Laboratory of Biology Departement FMIPA Unsyiah. Kanji pedah as the sample was taken from Meunasah Mesjid Syamtalira village, Aron Subs-district of North Aceh. This research used sample from variety storage time groups range 3-7 days; 5-7 months; 9-12 months; and 15-18 months. Data were analyzed in descriptive and compared with the quality standard from Directorate General of National Agency of Drug and Food Control (Dirjen BPOM RI). The result showed the entire sample had fungi with ranged 1.45-63.7x102. The amount of fungi exceeds the quality standard already established by the National Agency of Drug and Food Control No. 05018/KBPOM/2001: 50 colony/g. Also Aspergillus flavus was found with range from 3%-27% meanwhile Aspergillus niger was found with range from 21,1%-40,9%.
GAS CROMATOGRAPHIC ANALYSIS OF ORGANOPHOSPATE AND PYRETROID COMPOUNDS IN MOSQUITO COILS Sadli Sadli; Misrahanum Misrahanum
Jurnal Natural Volume 11, Number 2, September 2011
Publisher : Universitas Syiah Kuala

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Abstract

Mosquito coils contain active compounds such as chlorpyriphos, dichlorphos, and d-alletrhrin which may be hazardous to the health. As majority of pesticides are stable heat, they can be changed into stable vapor state by column.  a gas chromatographic method of analysis was developed. Gas chromatography for organophosphate compounds, namely chlorpyriphos and dichlorphos, with a OV-17 packed column, and a flame photometry detector equipped by filter for phosphor, which detecs phosphor containing compounds exclusively, avoiding any interference of other non phosphor compounds present in the sample matrix. Gas chromatography for a pyrethoid compound, d-allethrin, utilizes a HP-1 capilarry column with a flame ionization detector, and detect, any ionizable compound. The research was initiated by adjustment of the condition of gas chromatography system to obtain an appropiate separation of compounds a good shape of chromatogram and a tolerable retention time.  With a flow rate of nitrogen 55 ml/min, column temperatures of 210oC, a detector and injector temperature of 230oC, the method gave a retention times chlorpyriphos of 6,47 minute and that of dichlorphos of 0,73 minute . The difference in retention time of chlorpyriphos and that of dichlorphos was caused by the difference in molecular weight of both compounds, thin dichlorphos with a smaller molecular weight (220, 98) was eluted faster than chlorpyriphos (350,6). For  d-allethrin whit a flow rate of nitrogen gas of 40 ml/min, a column temperature  of 180oC, a detector and injector temperature of 210oC, a retention time of d-allethrin of 3,28 minutes was obtained. The mosquito coils tested did not contain any chlorpyriphos nor dichlorphos, and some contained d-allethrin. The d-allethrin content obtained in one of the sample was beyond the tolerated limit.
USING A USER MODEL FOR ENHANCING ASSESSMENT AND FEEDBACK IN E-LEARNING Rajibussalim Rajibussalim
Jurnal Natural Volume 11, Number 2, September 2011
Publisher : Universitas Syiah Kuala

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Abstract

The study is about a method for enhancing the assessment in e-learning. We study summative assessment that enables teachers or examiners to know if their students have reached an appropriate level of knowledge and formative assessment that enables a student to check how well they are performing in learning. This type of assessment takes the form of a more detailed feedback such as in what aspects a student posses strengths as well as where they have weaknesses. We implement a new approach for enhancing assessment in e-learning by building a system that utilizing a user model to capture user’s knowledge of a concept and to keep updating it in their user models. We implement the system by using the Multiple Choice Questions (MCQs) that were combined with a standard of test called the Question Test of Interoperability (QTI). As the result, more positive and negative feedback can be offered to e-learning users.

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