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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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Effect of Cytokinins and Carbenicillin on In vitro Axillary-Shoot Growth of Albizia [Albizia falcataria (L.) Fosberg] Sri Nanan Widiyanto; Mirah Dila Sari; Rina Ratnasih Irwanto
Jurnal Matematika & Sains Vol 13, No 2 (2008)
Publisher : Institut Teknologi Bandung

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Abstract

Effect of N6-benzylaminopurine (BA), 6-furfurylaminopurine (kinetin) and carbenicillin on axillary-shoot growth ofalbizia [Albizia falcataria (L.) Fosberg] from cotyledonary node-segments were evaluated in vitro. Shoot inductionmedium was composed of Murashige and Skoog (MS) basal medium with or without the addition of BA or kinetin. Thesensitivity to carbenicillin was tested using shoot induction medium with the addition of carbenicillin at 10-50 mg/L.The results showed that the optimal axillary-shoot growth was observed on medium containing 2.2 μM BA and 2.3 μMkinetin, which reached the average of 36.0±2,2 mm shoot-length and 2.9±1,1 nodes/shoot in four weeks. The addition ofcarbenicillin inhibited the axillary-shoot growth, shown by 6.1-11.5 mm of shoot length of and 1.0-11.1 of nodes/shoot.A total of 60 shoots were elongated and rooted in in vitro condition on MS medium without growth regulator. Allplantlets were successfully transferred to a soil-sand medium (1:1) and grew well in the green-house.
Fotokonduktor Al-GaN-Al untuk Aplikasi Detektor Ultraviolet Dadi Rusdiana
Jurnal Matematika & Sains Vol 13, No 2 (2008)
Publisher : Institut Teknologi Bandung

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Abstract

An ultraviolet detector has been fabricated from a GaN thin film with Al-GaN-Al photoconductor structure. The I-Vcharacterization on the photoconductor samples under irradiation condition indicates an increase in the electronconcentration to 4.6 × 1018 cm-3 with photoconductivity of 59.9 Ω-1cm-1, whereas under dark condition thephotoconductivity is 45.7 Ω -1cm-1. There is an increase in the conductivity by about 14.2 Ω-1cm-1 as a result fromirradiation by photons with energy 3.4 eV. The I-V curve also yields a contact resistance of around 0.26 Ωcm3 withbarrier height between aluminum and GaN of 0.44 eV in dark condition, whereas with irradiation the barrier reduces to0.43 eV. The low contact resistance indicates that aluminum contact has an ohmic contact characteristic with type-nGaN semiconductor. The measurements on spectral responses of the photoconductor samples show that the samples arequite sensitive to light with wavelength between 345 nm and 365 nm which is in ultraviolet range. For wavelengthlonger than 365 nm the current response drops significantly. This suggests that the samples have a cutoff wavelength λcof about 365 nm.
Uncertainty Assessment of Alpha-Spectrometry Analysis of 210Po in Marine Sediment Sample from Jakarta Bay Ali Arman Lubis
Jurnal Matematika & Sains Vol 13, No 2 (2008)
Publisher : Institut Teknologi Bandung

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Abstract

The expression of measurement uncertainties in a standardized form is a requirement for result reliability as it imposesimplications to the interpretation of analytical results. In this work, the analytical procedure involves samplepreparation steps for drying, dissolution and further radiochemical separation, self deposition and counting of 210Po ofmarine sediment sample are discussed. An isotopic tracer (209Po) is used to determine the overall chemical yield and toensure traceability to a national standard. The uncertainty assessment of 210Po is discussed using marine sedimentsample from Jakarta Bay with quality assurance based on Standard Reference Material, International Atomic EnergyAgency, No. 300 (SRM IAEA-300) and SRM IAEA-368 for marine sediments. 210Po is measured by a PIPS detectorcoupled to a multichannel spectrometer. The contribution of the sources to the expanded standard uncertainty in theconcentration of 210Po in marine sediment is assessed and the sample activity which contributed 71.10% of total isidentified as the major contribution.
Sintesis dan Karakterisasi Struktur Kristal Ion [Cr3O(OOCC6H5)6(H2O)3]4[α-SiW12O40]⋅10H2O⋅8CH3COCH3 Aldes Lesbani
Jurnal Matematika & Sains Vol 13, No 2 (2008)
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The complexation of polyoxometalate K4[α-SiW12O40] and organometallic complex of [Cr3O(OOCC6H5)6(H2O)3](NO3)forms ionic crystal of [Cr3O(OOCC6H5)6(H2O)3]4[α-SiW12O40]⋅10H2O⋅8CH3COCH3 (1a). Single crystal XRD analysisshowed that benzoic groups of organometallic complex were stacked to form eight-membered ring. The π-π interactionmay stabilize the crystal structure of 1a. FT-IR spectrum of ionic crystal showed that characteristic vibration ofpolyoxometalate and organometallic compound existed in the crystal. The amount of water molecules in 1a wasdetermined by using TG-DTA analysis. Ten water molecules were found in the ionic crystal of 1a. The GC analysisshowed that eight acetone molecules existed in the ionic crystal of 1a.
Pengaruh Pengasaman terhadap Fotodegradasi Klorofil a Aji Wahyu Budiyanto; Soenarto Notosudarmo; Leenawaty Limantara
Jurnal Matematika & Sains Vol 13, No 3 (2008)
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Chlorophyll is tetrapyrole pigment, which is potential to be developed as photosensitizer agent on cancer photodynamictherapy. Its environments and properties during interaction are an important parameter to know the next fate of thesensitizer. Acidic environment is one of the key factors on cancerous patients. The research was carried out to determinethe acidification effect against photostability of chlorophyll a that was observed by its spectral pattern. Result showedthat titration of less than 250 μL acetic acid 3 M caused degradation of chlorophyll a more rapidly. Volume and type ofacid properties did not only influenced pheophytinization reaction, but also caused pheophytin a to deaggregate, thatwas characterized by hypsochromic shift of Qy band.
Synthesis of Wax Esters From Palm Kernel Oil Catalyzed by Lipase Erin Ryantin Gunawan; Dedy Suhendra
Jurnal Matematika & Sains Vol 13, No 3 (2008)
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The lipase catalyzed reaction of wax esters synthesis using palm kernel oil and long chain alcohol (oleyl alcohol) assubstrates and lipase lipozim as catalist was carried out. The effects of various reaction parameters such as reactiontime, temperature, amount of enzyme, molar ratio of substrates and various organic solvents were investigated. Theoptimum reaction condition for wax ester synthesis is a mixture of palm kernel oil and oleyl alcohol with molar ratio of(3:1), with 1.5% (w/v) lipozyme, at 40 oC for 7-10h, and with hexane as the best solvent. Percentage yields of wax estersobtained at these optimum reaction conditions was 84.4 ± 2.85 %.
Pengembangan Metode Prakonsentrasi dengan Teknik Injeksi Alir untuk Analisis Cu2+ dan Pb2+ dalam Air Aliran Sungai Citarum dan Waduk Saguling Saepudin Suwarsa; Buchari Buchari; Aman Sentosa Panggabean
Jurnal Matematika & Sains Vol 13, No 3 (2008)
Publisher : Institut Teknologi Bandung

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A research aiming at developing preconcentration method using ion exchange resin column for Cu2+ and Pb2+ ionsanalysis in the stream of Citarum river and the Saguling lake has been carried out. The preconcentration method wasperformed using a mini column filled with Dowex 50W-X8. The preconcentration method was developed to beincorporated with the flow injection analysis (FIA), for which water samples were passed through the mini column andby eluting with 3 M HCl, and the eluate was detected by an atomic absorption spectrophotometer detector. The optimalconditions for the best analytical performance with FIA-AAS method were 5 mL injection volume of waters samples, theeluent HCl concentration was 3 M and the volume was 1 mL. The limit of detection achieved by this method for Cu andPb ions were 5.26 dan 24.57 ppb, respectively. The reproducibility level shown by the coefficient of variance for thismethod was 2.11%. The method was applied to natural water samples with a recovery percentage of > 95%. The spikemethod develoved in this research, for matrices of water sample from Citarum river and the Saguling lake, has itsadvantage that the matrices did not affect the results of measurements.
Pengaruh Temperatur terhadap Mekanisme Inhibisi oleh Sistein pada Korosi Baja Karbon dalam Larutan NaCl Jenuh CO2 Yayan Sunarya; Cynthia Linaya Radiman; Sadijah Achmad; Bunbun Bundjali
Jurnal Matematika & Sains Vol 13, No 3 (2008)
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The inhibition mechanism of cysteine on API 5L X65 carbon steel corrosion in CO2-saturated NaCl solution at 300K –360K was studied. The investigations involved potentiodynamic polarization, electrochemical impedance spectroscopy(EIS) methods and computer simulation of Zview program. The results showed that the inhibition mechanism takes placethrough formation of passive layers that covers carbon steel surface with inhibition efficiency up to 85%. Functionalgroup dominantly involved in the formation process of the passive layers is –SH at low temperature, and –NH3+ athigh temperature. The increasing temperature alters the carbon steel corrosion/inhibition process from kinetics ofcharge transfer to diffusion process.
Spectral Decomposition of Transition Matrix Sutawanir Darwis; Kuslan Kuslan
Jurnal Matematika & Sains Vol 13, No 3 (2008)
Publisher : Institut Teknologi Bandung

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The transition probabilities of a two-state Markov process can be determined explicitly. The modeling of forcetransition of two state Markov process using double decrement approach is well developed in the literature. However,the approaches are mainly analytic or illustrative and are based on small data set. The study based on large data set arerarely published. For higher number of states, the computation of transition probabilities is laborious, and analternative method is needed. This work aims to propose a spectral approach of forces of transition that attempts toaddress the issues. The method is based on results that are available when a Markov process with constant forces oftransition is assumed. In this case, transition probabilities are obtained regardless of the number of states. A differentialequation is used to express the relationship between forces of decrements and transition probabilities, and by assumingconstant force, the explicit solution is reduced to spectral decomposition of force of decrements. The results are thevisualization of transition probabilities, and a contribution for the development of double decrement table. The maincontributions of this work are a spectral representation of transition probabilities and a multistate approach to doubledecrement modeling.
Effect of 2,4-D on Indirect Somatic Embryogenesis and Surface Structural Changes in Garlic (Allium sativum L.) cv. Lumbu Hijau Totik Sri Mariani; Hiroshi Miyake; Rizkita Rachmi Esyanti; Ida Nurwendah
Jurnal Matematika & Sains Vol 8, No 4 (2003)
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A study concerning the effect of 2,4-D on indirect somatic embryogenesis and surface structural changes in garlic (Allium sativum L.) cv. Lumbu Hijau was conducted. The purposes of this study were to evaluate the effect of 2,4-D on the induction of somatic embryogenesis and to observe the developmental stage of somatic embryo as well as the surface structural changes of somatic embryo in garlic. Root tips explants were cultured on embryogenic callus induction medium (ECIM). Somatic embryos were then transferred to the embryo maturation medium (EMM), desiccated and subsequently transferred to the repetitive somatic embryogenesis medium (RSEM). Observation by dissecting microscope showed that embryogenic callus and somatic embryo was formed at ECIM containing 0.1 μM 2,4-D. At EMM containing 0.01 μM 2,4-D somatic embryo developed into mature somatic embryo. Somatic embryo underwent repetitive somatic embryogenesis that consisted of globular and mature somatic embryo at RSEM, without plant growth regulator. Observation by scanning electron microscopy showed that the development al stages of garlic somatic embryo consisted of proembryo, transition phase from proembryo to globular, globular, mature embryo and single cotyledon stages. Effect of 2,4-D on the cell surface structure could be seen on each somatic embryo developmental stage. In ECIM containing 0,1 μM 2,4-D, proembryo, transition embryo and globular embryo were formed. The surface of proembryo was smooth whereas fibrillar material as cellulose microfibril, was observed during the transition from proembryo to globular stage. The surface of globular stage was entirely covered by a new cell wall. Subsequently, in 0.01 μM 2,4-D, mature embryo and single cotyledon were formed, which their cell wall surface was stable. From this study, it could be concluded that the optimum concentration of 2,4-D for induction of embryogenic callus and initiation of somatic embryo was 0.1 μM. Decreasing of 2,4-D concentration to 0.01 μM resulted in the development of globular embryo to mature and single cotyledon stage. Repetitive somatic embryogenesis occurred in RSEM medium without plant growth regulator. Based on this result it can be concluded that each somatic embryo developmental stage had a typical characteristic of surface structure.

Page 19 of 34 | Total Record : 339

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