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INDONESIA
Jurnal Matematika & Sains
Published by Institut Teknologi Bandung
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
Arjuna Subject : -
Articles 339 Documents
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Peningkatan Produksi Azadirahtin dalam Kultur Suspensi Sel Azadirachta indica A.Juss melalui Penambahan Skualen Zulfa Zakiah; Erly Marwani; Arbayah H. Siregar
Jurnal Matematika & Sains Vol 8, No 4 (2003)
Publisher : Institut Teknologi Bandung

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Abstract

One of the methods to enhance the secondary metabolite content in plant tissue culture is precursor feeding. The study on azadirachtin enhancement in cell suspension culture of Azadirachta indica A.Juss was conducted by supplying squalene as precursor. Callus were induced on Murashige-Skoog solid medium with addition of 0,5μM 2,4-dichlorophenoxy acetic acid (2,4-D) and 1,0μM 6-benzylaminopurine (BAP). Callus were subcultured to Murashige-Skoog liquid medium with addition of 0,1μM 2,4-D and 1,0μM BAP. The cell suspension cultures were subcultured three times, and then treated each with 10, 100, and 1000μM of squalene. Azadirachtin content was measured at 0, 2, 4, 6, 8, 10 and 12 days after feeding using HPLC (High Pressure Liquid Chromatography) with methanol:water (6:4) as mobile phase. The results showed that the highest azadirachtin content in cell suspension culture before supplying squalene was 0,041 g/g cell dry-weight (dw) at the age of 8 days culture. The increment of azadirachtin content in cell and medium was significantly influenced by squalene concentration and age of culture. The highest azadirachtin content after feeding in the cell mass (0,076 ± 0,006 g/g dw) and in the medium (0,229 ± 0,003 mg/L)was achieved on supplying 100μM squalene to 10 and 12 days culture.
Efek Antihipertensi dan Hipotensi beberapa Fraksi dari Ekstrak Etanol Umbi Lapis Kucai (Allium schoenoprasum L., Lliliaceae) Irda Fidrianny; Kosasih Padmawinata; Soediro Soetarno; Elin Yulinah
Jurnal Matematika & Sains Vol 8, No 4 (2003)
Publisher : Institut Teknologi Bandung

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Hypotensive and antihypertensive effect of fractions of ethanolic extract of “kucai” (Allium schoenoprasum L., Liliaceae) bulb had been tested on male Wistar rats. The ethyl acetate, n-buthanol and aqueous fractions of both fresh and dry bulb had hypotensive and antihypertensive effects. The aqueous fraction of fresh bulb at a dose of 25 mg/kg body weight showed the highest hypotensive and antihypertensive activities. The n-buthanol fraction of dry bulb at a dose of 50 mg/kg body weight showed the highest hypotensive activity. The ethyl acetate fraction of dry bulb at a dose of 50 mg/kg body weight showed the highest antihypertensive activity.
Pengaruh Pelarut dan Temperatur terhadap Tranport Europium (III) melalui Membran Cair Berpendukung Buchari Buchari; Eti Testiati; Aminudin Sulaeman
Jurnal Matematika & Sains Vol 8, No 4 (2003)
Publisher : Institut Teknologi Bandung

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Study of the influence of solvents and temperature on the transport of Eu(III) through supported liquide membrane (SLM) has been undertaken. The first step of this work was to determine the best conditions for the extraction. Polytetrafluoroethylene (PTFE) membrane has been used in this research. The thickness of the film is 47 μm and the average pore size is 0.45 μm.The membrane was impregnated in the carrier solutions for 2 hours. The carrier used were di 2-ethylhexyl phosphoric acid (D2EHPA) and tributylphosphate (TBP). Feed compartment contained 100 ppm Eu(III) in a buffer solution. Receiver compartment contained 0.1 M nitric acid. The optimum result has been achieved at feed pH of 3 and a mixture of 0.8 M D2EHPA and 0.2 M TBP in kerosene. At this conditions, 71.74 % of Eu( III) was transported through SLM. The transport percentase ncreased in the solvent order of kerosene>toluena>chloroform>n-hexane>1,2-dichloroethane. The mixture of 75% of kerosene and 25% of chloroform increased the Eu(III)’s transport from 71.74 % to 79.1% compared with the kerosen as a solvent. The elevation of temperature from 25oC to 60oC increased the transport of Eu(III) from 71.74 to 92.26 %. The profile of membrane surface was characterized by scanning electron microscope (SEM).
Pengaruh Variasi Komposisi Amilosa terhadap Kemudahan Biodegradasi Poliuretan Eli Rohaeti; N. M. Surdia; Cynthia L. Radiman; E. Ratnaningsih
Jurnal Matematika & Sains Vol 8, No 4 (2003)
Publisher : Institut Teknologi Bandung

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Amylose had been used to synthesize polyurethanes. A mixture of polyethylene glycol (PEG) with a molecular weight 400 with amylose was reacted with diphenylmethane-4,4’-diisocyanate (MDI) at room temperature to produce polyurethanes. The precured polyurethanes were heat-pressed and PU sheets were obtained. Characterization of functional groups was determined by FTIR spectrophotometry and crystallinity was analyzed by using XRD. The hydrogen bonding index (HBI) of polyurethane samples increased with an increasing of amylose content. The addition of 15% (w/w) amylose decreased the degree of crystallinity of polyurethane. The films of polyurethanes were biodegraded by Pseudomonas aeruginosa in an liquid of Luria Bertani (LB) media at 37oC for 5, 10, 15, 20, 25, and 30 days, with the changing of media every 5 days. The result of weight loss percentace showed that all polymers may be biodegraded, with different biodegradation rate. The biodegradability (rate of weight loss) of polyurethanes by Pseudomonas aeruginosa increased when the amylose content in the polyurethane increased. The polyurethane product with 15% amylose – PEG400 – MDI had the highest biodegradability.
Struktur Lapis TitanoNiobat terpilarkan Polimer-{Ti(IV) Okso Hidroksida} Hari Sutrisno
Jurnal Matematika & Sains Vol 8, No 4 (2003)
Publisher : Institut Teknologi Bandung

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The purpose of this research was to incorporate the cation of [Ti8O12(H2O)24]8+ in the interlayer of HTiNbO5 by so-called “Chimie Douce” method. The cation of [Ti8O12(H2O)24]8+ has been tranformed to polymer-{Ti(IV) Oxo Hydroxide} and pillared in the interlayer HTiNbO5. The incorporation of polymer-[Ti(IV) Oxo Hydroxide] in the interlayer HTiNbO5 has been confirmed by powder X-ray diffraction, Scanning Electron Microscopy (SEM) and High Resolution Transmission Electron Microscopy (HRTEM). The exchange of the polymer of {Ti(IV) Oxo Hydroxide} was facilitated by opened layers of butylamine-intercalated complexes.
Synthesis of Catalytically Active High Surface Area Sulfated Zirconia Totok E. Suharto
Jurnal Matematika & Sains Vol 8, No 4 (2003)
Publisher : Institut Teknologi Bandung

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A new synthesis method to produce active sulfated zirconia catalyst has been developed. Sulfated zirconium oxide has been prepared by one-step synthesis, where the sulfatation was directly introduced during the gelating step of zirconium hydroxide. The gelating conditions and other synthesis parameters, such as drying and calcination procedures have important influence on the product properties. The obtained sulfated zirconia has high specific surface area, up to 180 m2g-1. The surface area of sulfated zirconia was influenced by increasing of pH-value of the zirconium hydroxide gel in a range of 5 to 9. Active sulfated zirconia catalyst could be prepared by optimalization of synthesis conditions and resulfatation. The catalytic activity of this catalyst in the isomerization of n-butane was higher than the activity of commercial sulfated zirconia and zeolite of mordenite type. The active sulfated zirconia showed a very high selectivity for iso-butane of 85 – 95%, whereas mordenite showed low selectivity of only 40 – 60%. The deactivated catalyst can be simply regenerated by calcination.
Efek Gosipol terhadap Kontraksi Usus Halus Mencit (Mus musculus) Swiss Webster Jantan secara in vitro Darmadi Goenarso; Suripto Suripto; Zulfiani Zulfiani
Jurnal Matematika & Sains Vol 9, No 1 (2004)
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The in vitro effect of gossypol on the small intestinal contractility of Swiss Webster mice have been examined. Thirty six sexually mature male mice with body weights of 30,5-36,5 g. were used and the tested concentrations of gossypol were 5, 7.5, and 10 ppm. Segments of the small intestine such as: duodenum, jejunum and ileum were isolated and immersed in Tyrode solution at 37 oC. The contractions of these organs were measured and recorded using a myograph and physiograph. As control, the contractions of these organs were recorded in Tyrode solution for 360 seconds. The solution was then replaced by gossypol-Tyrode solution and the contractions were recorded again for the next 360 seconds. The results showed that gossypol increased shortly and followed by gradual decreases of tension in all small intestinal segments. Gossypol also lowered the frequency of the intestinal contractions when compared with control. The strongest action of gossypol was found when the intestines were treated in 10 ppm, compared to the action of those treated with 7.5 ppm and 5 ppm. It is assumed that gossypol impaired peristaltic movements of the intestines and thus decreased digestibility of mice.
Size Dependent Phase Transition in BaTiO3 and PbTiO3: a General Theory Based on a Simple Ising Model Mikrajuddin Abdullah
Jurnal Matematika & Sains Vol 9, No 1 (2004)
Publisher : Institut Teknologi Bandung

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A general theory based on simple Ising model has been developed to explain the effect of size on the phase transition in BaTiO3 and PbTiO3. The model can explain very well the presence of critical temperature for the occurrence of tetragonal ⇔ cubic structure, the presence of critical size where this transition to occur. Size dependent of the transition is induced by the dependence of dipole-dipole interaction in the sample on the size.
Studi Elektrokimia Sistem Fe(III)/Fe(II) dalam Lelehan KOH secara Voltametri Siklis Buchari Buchari; Suprapto Suprapto
Jurnal Matematika & Sains Vol 9, No 1 (2004)
Publisher : Institut Teknologi Bandung

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Electrochemical study of Fe(III)/Fe(II) system in molten KOH by cyclic voltammetry has been investigated using platinum wire, antimony wire and gold wire as working, reference and counter electrodes respectively. The solution of ferric and ferrous salts in molten KOH were maintened at 210 oC. Cyclic voltammogram of FeCl3 and FeCl2 showed electrochemical system of Fe3+/Fe2+ and Fe3+/Fe at the electrode potentials : 1.3 and 0.8 V respectively versus antimony electrode. In molten KOH, Fe(CN)63- decomposed to Fe3+, meanwhile Fe(CN)64- is oxidised to Fe(CN)63- and followed by its decomposition to Fe3+. The electrochemical parameters in aqueous to be tested in this study are applicable in molten KOH.
Optimasi Parameter Tekanan Deposisi untuk Penumbuhan Lapisan Tipis Mikrokristal Silikon dengan Metode HWC PECVD Amiruddin Supu; I Wayan Sukarjita; Fakhruddin Fakhruddin; Fitri Suryani Arsyad; Toto Winata; Sukirno Sukirno
Jurnal Matematika & Sains Vol 13, No 4 (2008)
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The Hot Wire Cell PECVD method has been developed and successfully applied to grow the hydrogenated microcrystalline silicon ( µc-Si:H) thin films. The µc-Si:H thin films were grown on the 7059 corning glass at a filament temperature of 1000 oC. Ten percents silane (SiH4) gas diluted in hydrogen (H2) gas was used as gas source. In the hot wire cell PECVD method, reactant gases are decomposed as a result of reaction with a heated filament. The filament was placed parallelly with inlet gas system and outside of electrodes. The characterization results exhibited that the deposition rate increased from 1,45 Å/s to 1,56 Å/s with increasing the deposition pressure from 700 mTorr to 1100 mTorr. The SEM image and the XRD spectrum exhibited the transition of amorphous to microcrystalline silicon at an deposition pressure of 1000 mTorr. The transition of amorphous to microcrystalline was indicated by the reduction of amorphous parts and the appearance of peak diffraction at preferential crystal orientation. The dark and photo conductivities of the obtained µc-Si:H thin films was 1,2 x10-5 S cm-1 and 2,12 x 10-3 S cm-1, respectively.

Page 20 of 34 | Total Record : 339

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