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JURNAL SAINS
Published by Universitas Halu Oleo
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Articles 3 Documents
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Search results for , issue "Vol 1, No 1 (2012)" : 3 Documents clear
Sonai isolate as potential bacteria for fiber sago hydrolysis to monosaccharide Prima Endang Susilowati; Sarni Marwanti
SAINS : Jurnal Kimia & Pendidikan Kimia Vol 1, No 1 (2012)
Publisher : PKimia FKIP Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (298.038 KB)

Abstract

Cellulolytic and xylanolytic enzymes play an important role in natural biodegradation processes in which plant lignocellulosic materials are efficiently degraded by microorganisms. Large amount of fiber sago wastes from renewable sago residues are rich sources of cellulose, hemicellulose and lignin. Hemicelluloses wastes bioavailability conversion presupposes the changing of the macromolecular structure by using enzymes and to result free simple compounds (mono-disaccharide). The purposes of this study are isolation bacteria from water collected in the Sonai hot-springs and use bacteria for bioconversion of fiber sago. Bacteria were isolated on cellulose dan xylan agar medium and screened by the cellulolysis dan xylan method. Determining the reducing sugars liberated from cellulose and xylan using dinitrosalicylic acid (DNS) reagent.  The results are identification of bacteria from Sonai hot springs showed 13 isolates potential xylanolitic and cellulose.  Isolate IIIB-3 showed maximum xylanase and cellulose production. The isolate can hydrolysis fiber sago at condition optimum fermentation 500C, pH 6, shaker rate 175 rpm, 5% substrate, and 18 hours incubation.
learning subject and supporting through direct instruction model to increase students’ achievement in Physical Chemistry I classL Aceng Haetami
SAINS : Jurnal Kimia & Pendidikan Kimia Vol 1, No 1 (2012)
Publisher : PKimia FKIP Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (401.708 KB)

Abstract

The aim of this research is to know how materials coherent learning subject and supporting throughDirect Intruction Model (DIM) can increase students achievement in learning Physical Chemistry I.The metode used in this research is classroom action research using Direct Intruction Model (DIM).The results show that materials coherent learning subject and supporting through DIM can increase: (a)achievement in learning Physical Chemistry I increasing for every cycle: cycle I (average = 56,36) ,cycle II (average = 56,72), and cycle III (average = 61,36) ; (b) number of students complete learned(getted score ≥ 66) : cycle I (44,44 %) , cycle II (52,78 %), and cycle III (63,89 %) even complete classis not reached.
Analysis of essential mathematics concepts for fluently to study of chemistry Fahyuddin Fahyuddin
SAINS : Jurnal Kimia & Pendidikan Kimia Vol 1, No 1 (2012)
Publisher : PKimia FKIP Universitas Halu Oleo

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Abstract

This study aimed to identification and analysis of basic mathematical concepts that are widely used in studing chemistry, and so as a main required for the good understanding of quantitative chemistry. Chemistry concepts that can be represented in mathematical models, graphs, and tables of numerics were explored from several chemistry textbooks, that it is as the reference classes in college in the first and second years. The structures and properties of mathematical concepts that its have the same with to mathematical models that became the representation of chemistry concepts defined as the mathematical concepts needed to study chemistry. The results of the analysis of structural similarity between mathematics and chemistry concepts suggested that a number of essential mathematics concepts that support the understanding of chemistry, including: numbers, arithmetic operations (arithmetic), approximation, ratios, proportions, scientific notation, computation notation, logarithmic, exponential, laws of algebra, functions, graphs, system of equations, differential, and integral. The concept of algebra is the most widely used in learning or problem solving in quantitative chemistry. Chemistry students who have lack of undesrstanding of such theses mathematics concept will have difficulty to solving quantitative chemistry problems or studing chemistry. So that, those of essential mathematics concepts should became literacy of mathematics for students of chemistry. Each of concept of essential mathematics can be used in studying several quantitative chemical concepts. Conversely, some quantitative chemical concepts, such as a buffer solution, kinetics, and thermodynamics requires an understanding of a number of essential mathematical concepts.

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