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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
 1 
Search results for , issue " Vol 11, No 4 (2006)" : 6 Documents clear
Pengaruh Triptofan pada Pertumbuhan dan Kandungan Katarantin dari Kalus Catharanthus roseus Dingse Pandiangan; Dennie Heroike Rompas; Henry Fonda Aritonang; Rizkita Rachmi Esyanti; Erly Marwan
Jurnal Matematika & Sains Vol 11, No 4 (2006)
Publisher : Institut Teknologi Bandung

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Abstract

Research on the growth and catharanthine content of Catharanthus roseus callus which were treated with tryptophan had been done. Wet and dry weight of Catharanthus roseus callus decreased when treated with 100, 125 and 225 mg/L tryptophan, but callus treated with 150, 175 and 200 mg/L tryptophan grew better. Catharanthine contents of the kontrol callus was 423,22 µg/g dw. The treatment calli contains 485,00, 588,32, 875,10, 905,26, 784,10 and 950,54 µg/g dw of catharanthine respectively. The optimal tryptophan treatment for callus growth and catharanthine production was 175 mg/L tryptophan with a 113,90 %. increase of catharanthine content.
Pengembangan Program Aplikasi Komputer untuk Mengolah Data Uji Bioekivalensi Sukmadjaja Asyarie; Lucy Dewi Nurhayati Sasongko; Yusrani Salman
Jurnal Matematika & Sains Vol 11, No 4 (2006)
Publisher : Institut Teknologi Bandung

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Abstract

A computer application program for processing plasma/serum drug concentration data for bioequivalence test according to the Bioequivalence Study Guideline of The National Agency of Drug and Food Control of The Republic of Indonesia 2004, had been developed using Microsoft® Visual Basic 6.0. The program developed was used to process bioequivalent parameters using eight sets of plasma drug concentration data, and the results were compared to that of manual calculation using Microsoft® Excel 2003 program. Result showed that bioequivalence parameters calculated by this program were similar to those calculated by Microsoft®  Excel 2003.
Immobilizing Chitosan-Stabilized Palladium Nanoclusters on Titanium Dioxide and Their Catalytic Hydrogenation Properties Adlim Adlim
Jurnal Matematika & Sains Vol 11, No 4 (2006)
Publisher : Institut Teknologi Bandung

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Abstract

Four methods of immobilization of palladium nanoparticles stabilized by chitosan on the surface of titanium have been conducted. The immobilization techniques were denoted with catalysts symbols of [Pd0-chi-TiO2], [Pd0-chi]-TiO2, [Pd0-chi]-TiO2 - cross and Pd0-[chi-TiO2]. Pd0[chi-TiO2] that was prepared by wet impregnation of palladium ions on the surface of titanium-coated chitosan and palladium ions were reduced by refluxing in methanol, produced palladium nano particles catalyst with high catalytic activities compared with those prepared with other methods. The catalytic activity for conversion of nitrobenzene to aniline at 30 oC and 1 atm followed the trend of Pd0-[chi-TiO2] > [Pd0-chi-TiO2] > [Pd0-chi]-TiO2 > [Pd0-chi]-TiO2 - cross. Most of the palladium metal particles in Pd0-[chi-TiO2] were exposed and dispersed with average size of 7.3 nm, while without chitosan, the particles were larger, aggregated and had of low catalytic activity.
Synthesis and Characterization of Poly(methyl methacrylate)/SiO2 Hybrid Membranes: Effect of Silica Contents on Membrane Structure Muhammad Ali Zulfikar; Abdul Wahab Mohammad
Jurnal Matematika & Sains Vol 11, No 4 (2006)
Publisher : Institut Teknologi Bandung

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Abstract

Hybrid organic-inorganic based on poly(methyl methacrylate)/SiO2 (PMMA/silica) membranes were prepared using sol-gel technique under acidic conditions with different tetraethoxy orthosilane (TEOS) concentration. The thin membrane films were characterized using water permeability, water uptake, size porosity, Fourier Transform Infra Red (FTIR) and SEM analysis. Dispersion of particles in the nano scale was only possible with addition of TEOS above 10%. Organic-inorganic solutions with compositions varying from 100 PMMA/ TEOS 0 to 75 PMMA/25 TEOS were used to cast the asymmetric membranes. Water permeability, water up take and porosity size increase as TEOS content increases. SEM analysis showed that the membrane morphology changed from co-continuous phase to nodule structure if 10% TEOS was added, then return to co-continuous phase again when above 15% of TEOS was added.
Ex Situ Investigation of Surface Topography of Borax Crystals by AFM: Relation Between Growth Hillocks and Supersaturation Interpreted by Spiral Growth Theory Suharso Suharso
Jurnal Matematika & Sains Vol 11, No 4 (2006)
Publisher : Institut Teknologi Bandung

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Abstract

The relationship between growth hillocks and supersaturation on the surface of borax crystals has been investigated using ex situ atomic force microscopy (AFM). The results showed that as the supersaturation increases, the mean step separation (yo) decreases. The mean step separation for the (010), (111), and (001) faces, at relative supersaturation (s-1) of 0.025 were 17.34 ± 0.56, 16.05 ± 0.24, and 17.4 ± 0.37 µm, and at relative supersaturation (s-1) of 0.21 were 11.43 ± 0.11, 8.23 ± 0.22, and 8.22 ± 0.31 µm, respectively. The average step height (h) of the (100) face for relative supersaturation of 0.025 and 0.21, was 109 and 76 nm, respectively. The edge free energy of the (010), (001), and (111) faces calculated at relative supersaturation (s-1) of 0.02 were 0.25, 0.23, and 0.25 J/m2 and calculated at relative supersaturation of 0.21 were 1.36, 0.98, and 0.98 J/m2 respectively.
Reactions of The First Cisplatin Hydrolytes cis-[PtCl(15NH3)2(H2O)]+ with N-Acetylcysteine Sutopo Hadi
Jurnal Matematika & Sains Vol 11, No 4 (2006)
Publisher : Institut Teknologi Bandung

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Abstract

The interactions between cis-[PtCl(15NH3)2(H2O)]+ and N-acetylcysteine (H3accys) in aqueous solution was investigated. In this reaction, polymeric solid was not formed and the amine liberation was slower than that of cis-[Pt(15NH3)2(H2O)2]2+. Initially, the only product observed in the reaction of cis-[PtCl(15NH3)2(H2O)]+ with a variety of thiols was a platinum(II) species with chloride and the thiolate ligand bound monodentate through sulphur, although different final product was obtained in each reaction. In this reaction, after the formation of a species with thiolate bound monodentate cis-[PtCl(15NH3)2(H2accys-S), two new platinum products were observed, namely a four-membered ring dinuclear platinum(II) complex, cis-[{Pt(15NH3)2)2}2( µ-Cl) ( µ-H2accys-S)]2+ and a six-membered -S,O- chelate ring complex, cis-[Pt(15NH3)2(Haccys-S,O), while dinuclear sulphur-bridged complex cis-[{Pt(NH3)2}2(H2accys- µ-S)2)]2+, giving a broad peak in 15N NMR, was only present in very tiny amounts in this reaction.

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