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INDONESIA
Jurnal Matematika & Sains
Published by Institut Teknologi Bandung
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
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Articles 339 Documents
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Senyawa-senyawa Oligomer Resveratrol dari Kulit Batang Shorea brunnescens (Dipterocarpaceae) Haryoto Haryoto; Yana Maolana Syah; Lia Dewi Juliawaty; Sjamsul Arifin Achmad; Jalifah Latip; Euis Holisotan Hakim
Jurnal Matematika & Sains Vol 11, No 3 (2006)
Publisher : Institut Teknologi Bandung

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Six resveratrol oligomers, namely (-)- ε-viniferin (1), (-)-laevifonol (2), (-)-vaticanol B (3), (-)-hemsleyanol D (4), (+)-isohopeaphenol (5), and (-)-hopeaphenol (6) have been isolated from the acetone extract of the stem bark of Shorea brunnescens. The structure determination of these compounds were based on spectroscopic data (UV, IR, 1H NMR), and compared with literature data. The cytotoxicity of isolated compounds against murine leukemia P-388 cells showed the IC50 values as 18.1, 23.2, 41.9, 12.3, 39.7, and 5.5 µM, respectively.
Synthesis and Magnetic Properties of a Fe-Mn-Cr Multinuclear Complex with 4-Amino-1,2,4-triazole and Oxalate Ligands Iis Siti Jahro; Djulia Onggo; Ismunandar Ismunandar; Susanto Imam Rahayu; Esther Jacoba Martha Vertelman; Petra van Koningsbruggen
Jurnal Matematika & Sains Vol 11, No 3 (2006)
Publisher : Institut Teknologi Bandung

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Abstract

A multinuclear Fe-Mn-Cr complex with 4-amino-1,2,4-triazole (NH2trz) and oxalate (ox) ligands has been synthesized successfully. The formula of the [Fe(NH2trz)3][ClO4][MnCr(ox)3].4H2O complex has been obtained based on the metal and C, H, N contents. The presence of water molecules, metal-ligand bonding and bridge ligand in the multinuclear complex has been confirmed by its infrared spectrum. The compound crystallizes in the hexagonal system with cell parameters of a = b = 18.695 Å and c = 57.351 Å. The compound shows a gradual spin crossover for iron(II) in the [Fe(NH2trz)3]2+ with transition temperature (T1/2) of 205 K. The antiferromagnetic interaction between Cr(III) and Mn(II) ions in the [MnCr(ox)3]n n- network is observed from the Weiss constant (θ) of -2.3 K.
Dua Flavonoid Tergeranilasi dari Daun Sukun (Artocarpus altilis) Yana Maolana Syah; Sjamsul Arifin Achmad; Eri Bakhtiar; Euis Holisotan Hakim; Lia Dewi Juliawaty; Jalifah Latip
Jurnal Matematika & Sains Vol 11, No 3 (2006)
Publisher : Institut Teknologi Bandung

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Abstract

Two geranylated flavonoid derivatives, namely 2-geranyl-2,4,3,4-tetrahydroxydihydrochalcone (1) and 8-geranyl-4,5,7-trihydroxy-flavanone (2), had been isolated from methanol extract of the leaves of sukun (Artocarpus altilis). The structures of the two compounds were determined based on UV, IR, 1H NMR and 13C NMR spectra, and by comparing with the previously reported data. The presence of these two compounds in A. altilis indicated that the leaves of Artocarpus plants tend to produce more simple flavonoids.  
Pengaruh Inokulasi Cacing Tanah (Pontoscolex corethrurus Fr Mull) Terhadap Sifat Fisika Kimia Tanah dan Pertumbuhan Tanaman Kacang Hijau (Vigna radiata L.Wilczek) Varietas Walet Adianto Adianto; Diah Utami Safitri; Nuryati Yuli
Jurnal Matematika & Sains Vol 9, No 1 (2004)
Publisher : Institut Teknologi Bandung

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The effect of earthworm inoculation on soil physical and chemical properties and the growth of mung bean inexperimental pot had been studied. Earthworms were inoculated at four different densities i.e. 0 (Co), 4 (C4), 8 (C8)and 12 (C12)individuals in pots containing clay : humus : sand (5 :3 : 2) dry weight and kept for 120 days. Cowdung were applied ad libitum. The control (without earthworms inoculation) consisted of two groups ; with andwithout dung ( Co- and Co+). The results of this experiment indicated that the rate of microorganism respirationwas highest in C12 treatment and significantly different (p < 0,05) from Co- and Co+. Cellulose decompositionlevel was also highest in C12 treatment compared to Co-. Soil physical analysis indicated that total porosityincreased significantly in C8 and C12 treatment compared to Co- and Co+ . Water permeability increasedsignificantly in C4 treatment compared to Co-. Soild chemical analysis indicated that soil pH increased due toearthworm inoculation. Organic Carbon decrease in accordance with the increasing number of earthworm, thehighest decreaseng in C12 treatment and the lowest in Co-. The N,P,K,Ca and Mg level increased in all treatmentscompared to Co-.. The plant height increased significantly in C8 and C12 treatment compared to Co- and Co+.Furthermore plant biomass increased significantly in treatment C12 compared to Co- and Co+. It can beconcluded that inoculation with earthworms could change the soil physical and chemical properties and improvedconditions for the growth of mung bean.
Structural Study of Bis(2,6-bis(pyrazol-3-yl)pyridine)nickel(II) by Calorimetry and EXAFS Spectrometry Kristian H. Sugiyarto
Jurnal Matematika & Sains Vol 9, No 1 (2004)
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Abstract

The stepwise complex formation of 2,6-bis(pyrazol-3-yl)pyridine, bpp, with nickel(II) perchlorate in DMF has beendetermined by calorimetric method and then followed by EXAFS spectrometry. It was found that the complexformation follows two stepwise pathways namely the formation of mono pyrazolyl-pyridine, [Ni(DMF)3 bpp]2+, andbis pyrazolyl-pyridine, [Ni(bpp)2]2+; the formation constants being log β1 = 6.57, and log β2 = 5.02, respectively,with the total value of log β = 11.58. The final formation of six-coordinated compound was confirmed by EXAFSanalysis with coordination number of 5.87(2) and the average of Ni–Nbpp bond length of 2.065(1) Å.
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)
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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)
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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)
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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.

Page 12 of 34 | Total Record : 339

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