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INDONESIA
Jurnal Matematika & Sains
Published by Institut Teknologi Bandung
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
Arjuna Subject : -
Articles 6 Documents
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Search results for , issue " Vol 9, No 2 (2004)" : 6 Documents clear
Efek Teratogenik Ekstrak Etanol Kulit Batang Pule (Alstonia scholaris R.Br) pada Tikus Wistar Endang Kumolosasi; Andreanus A. Soemardji; Komar Ruslan W.; Hasti Yuliani
Jurnal Matematika & Sains Vol 9, No 2 (2004)
Publisher : Institut Teknologi Bandung

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Abstract

The teratogenic effect of ethanolic extract of “pule” (Alstonia scholaris R.Br., Apocynaceae) bark at repeated doses of 490 and 980 mg/kg body weight administered orally to pregnant Wistar rats for 19 days had been studied. Each dose caused miscarriage in 9.1% of the rats and mild hydrocephalus in 23.1% of the fetuses (dose 490 mg/kg body weight) and in 12.0% of the fetuses (dose 980 mg/kg body weight).
Phototransistor Based Position Sensitive Detector for Signal Detection in Photothermal Spectroscopy Kusminarto Kusminarto; Susilo Susilo
Jurnal Matematika & Sains Vol 9, No 2 (2004)
Publisher : Institut Teknologi Bandung

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Abstract

In a photothermal spectroscopy the signal change is indicated by the displacement of the probe laser beam, therefore a position sensitive detector (PSD) is required to record this displacement that is proportional to the intensity of the signal.A phototransistor (BPY62D) based PSD has been designed and constructed. A Darlington circuit has been employed to increase the sensitivity of the PSD. Sensitivity of 100.6 mV/mm has been achieved which covered a linear area of 0,5 mm.
Isolasi dan Karakterisasi Mutan sup45 Saccharomyces cerevisiae Sensitif Temperatur Akhmaloka Akhmaloka; R. Hertadi; Senam Senam; P. E. Susilowati; M. Sindumarta; H. Sutedjo
Jurnal Matematika & Sains Vol 9, No 2 (2004)
Publisher : Institut Teknologi Bandung

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Abstract

One of the approachs to understand the structure-function of the gene is by studying its mutants. A few of sup45 ts mutants was isolated from Saccharomyces cerevisiae strain BSC483/1a induced by EMS. The concentration EMS of 1.5% (v/v) was found to be the most effective concentration on this study. Eight of sup45 ts mutants were selected from 515 allosupressor mutants. All of the mutants showed lower growth rate and maximum growth compared to that of the wild type. In addition of allosuppression phenotype, six of the mutant showed temperature sensitive and the other two exhibited temperature and paromomycine sensitive. Quantitation of an allosuppression phenotype using plasmid-borned gene fusion, PGK-termination codon-LACZ, showed that the mutants have a variation level of allosuppression. Temperature sensitivity analysis of the mutants showed that one, three, and one mutants were unviable at 32, 34, and 37OC, respectively. Further analysis on two of the mutants showed that the allosuppression level increased by increasing temperature growth. All the data suggested that the mutants were allelic specific mutants.
Kajian tentang Efek Garam terhadap Kinetika Transfer Co(II) dalam Sistem Dwi-Fasa Air/Asam di-(2-etilheksil)fosfat Hendrawan Hendrawan; Yaya Sonjaya; Hernani Hernani
Jurnal Matematika & Sains Vol 9, No 2 (2004)
Publisher : Institut Teknologi Bandung

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Abstract

The study of salt effect on kinetic of Co(II) transfer in aqueous/di-(2-ethylhexyl)phosphoric acid (D2EHPA) system has been performed using the technique of rotating membrane cell (RMC). Co(II) solutions in various conditions of aqueous phase were transferred into solution of di-(2-ethylhexyl)phosphoric acid in n-dodecane, as an organic phase, at various speeds of rotation. The result shows that the transfer of cobalt from aqueous into organic phase (D2EHPA) follows the transfer model of mass transfer with chemical reaction (MTWCR). The diffusion rate of complexed cobalt in the aqueous phase is the rate determining step. Higher ionic strenggt in bulk aqueous, lower affinity of aqueous solution to cobalt. The affinity of aqueous solution to cobalt becomes smaller as the ionic strength in the bulk aqueous increase.
Pengaruh Variasi Konsentrasi Asam Sulfat pada Proses Hidroksilasi Minyak Jarak (Castor Oil) Marlina Marlina; N. M. Surdia; Cythia Linaya Radiman; S. Achmad
Jurnal Matematika & Sains Vol 9, No 2 (2004)
Publisher : Institut Teknologi Bandung

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Abstract

Castor oil is derived from the bean of castor plant Ricinus communis L., belonging to Euphorbiaceae family from Nangroe Aceh Darussalam. Oil rendement per gram of castor bean is 45 – 52% with high purity and better than the standard oil given by AOAC. Acetylation and methylation protective process occurs on hydroxyl group of castor oil, indicated by decreasing of hydroxyl number, and also changing the structure of oil. Hydration process is more efective on acetylation-protective oil than that on non-protective and methylation-protective oil. Optimum condition reached when acid (H2SO4) concentration was 5% for non protective, 20% for acetylation protective and 15% for methylation protective oil. At those conditions, iodine and hidroxy values for non-protective, acetylation-protective, and methylation protective oil were 56.0 and 730.3; 23.3 and 664.5; and 38.5 and 649.8 mg/g, respectively.
On the Behavior of the Solution of the Wave Equation Hendra Gunawan; Wono Setya Budhi
Jurnal Matematika & Sains Vol 9, No 2 (2004)
Publisher : Institut Teknologi Bandung

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Abstract

We shall here study some properties of the Laplace operator through its imaginary powers, and apply the results to understand the behavior of the solution of the wave equation.

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