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INDONESIA
Jurnal Matematika & Sains
Published by Institut Teknologi Bandung
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
Arjuna Subject : -
Articles 4 Documents
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Search results for , issue " Vol 6, No 2 (2001)" : 4 Documents clear
Penentuan Parameter Fisik dan Geometrik Selubung Bintang Be di Gugus NGC 663 Berdasarkan Polarisasi Intrinsiknya D. N. Dawanas; R. Hirata; C. Kunjaya; H. L. Malasan
Jurnal Matematika & Sains Vol 6, No 2 (2001)
Publisher : Institut Teknologi Bandung

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Abstract

Enam bintang kelas B dan limabelas bintang kelas Be yang berada dalam gugus NGC 663 telah diamati polarisasi liniernya. Dari hasil fitting dengan kurva Serkowski diperoleh bahwa empat bintang kelas B berada dalam fase bintang Be dan dua bintang Be berada dalam fase bintang B. Sehingga bintang kelas B yang digunakan untuk menentukan polarisasi yang berasal dari materi antar bintang berjumlah empat buah dan bintang Be yang dianalisis berjumlah 16 buah dan satu bintang Be tidak dapat dianalisis karena datanya yang sangat jelek. Dari perbandingan sudut polarisasi yang diamati pada bintang-bintang Be dengan sudut polarisasi yang diamati pada bintang-bintang kelas B diperoleh bahwa sudut polarisasi bintang Be lebih tersebar. Keadaan ini menunjukkan bahwa polarisasi yang diamati pada bintang-bintang Be bukan hanya disebabkan oleh materi antar bintang saja, tetapi juga oleh polarisasi intrinsik bintang Be sendiri. Adanya sudut polarisasi yang besar dan yang kecil pada bintang-bintang Be dibandingkan dengan sudut polarisasi bintang B normal merefleksikan tersebarnya orientasi sumbu rotasi bintang-bintang Be dalam gugus tersebut. Keempat bintang kelas B selanjutnya digunakan untuk menentukan polarisasi yang berasal dari materi antar bintang dan hasilnya digunakan untuk menentukan polarisasi intrinsik keenambelas bintang Be dengan cara mengurangkan polarisasi yang diamati dengan polarisasi yang berasal dari materi antar bintang. Dari keenambelas bintang Be yang dianalisis, tiga belas bintang diantaranya dapat ditentukan parameter fisik dan geometrik selubungnya dengan cara membandingkannya dengan model silinder yang homogen dari Hirata (1983).
Use of landscape ecological analysis to determine ecotone locations: an evaluation based on field data Devi N. Choesin
Jurnal Matematika & Sains Vol 6, No 2 (2001)
Publisher : Institut Teknologi Bandung

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Abstract

The moving split-window (MSW) technique, a landscape ecological method to detect ecotone or landscape boundary location, is described as an alternative to the use of conventional vegetation analysis. The effectiveness of MSW was tested by applying it to vegetation transect data collected from the field. While MSW analysis is practical and easily interpretable, results indicate that this method tended to overestimate minor shifts in species composition at the community level. For more accurate results, MSW must still be supported by information at the community level (e.g., by ordination), and an alternative method must be developed which makes use of the strengths of available methods.
Clonal Propagation of Broccoli, Brassica oleracea L.var. italica through In Vitro Shoot Multiplication Sri Nanan Widiyanto; Dwi Erytrina
Jurnal Matematika & Sains Vol 6, No 2 (2001)
Publisher : Institut Teknologi Bandung

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Abstract

Shoot-tips of broccoli, Brassica oleracea var. italica cv. Green Valiant, were used as explant source in in vitro clonal propagation. The objective of this research is to examine the influence of growth regulators on axillary shoot induction and root formation. Shoot-tips were excised from sterile germinated seedlings and placed on shoot induction medium containing basal salts of Murashige and Skoog. Benzyl adenine (BA) and kinetin (KIN) at 0.10-10.0 μM were used either singly or in combination with naphthalene acetic acid (NAA) at 0.01-10.0 μM to induce shoot multiplication. For inducing root formation, NAA, indole acetic acid (IAA) or indole butyric acid (IBA) at 0.10-10.0 μM were applied. Experimental results showed that the addition of BA at 10.0 μM induced axillary shoot proliferation respectively. The addition of KIN induced less shoot multiplication than that of BA. During a four-week period of subculture, a single shoot-tip of broccoli produced 16-20 shoots on medium with the addition of 10.0 μM BA. Elongated shoots were mostly rooted on medium containing 1.0 μM NAA. Plantlets were successfully transferred to a soil-sand mixture medium (1:1) and grown naturally in the green house.
Molecular Genetic Analysis of sup45 Paromomycin Hypersensitive Mutants In Saccharomyces cerevisiae Rukman Hertadi; Hadi Sutedjo; Akhmaloka Akhmaloka
Jurnal Matematika & Sains Vol 6, No 2 (2001)
Publisher : Institut Teknologi Bandung

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Abstract

Translation termination in Saccharomyces cerevisiae is mediated by eRF-1 and eRF-3 protein encoded by SUP45 and SUP35 gene respectively. To probe more detail concerning the mechanism of translation termination in this organisms, the structure-function of the eRF-1 protein was studied by analyzing of sup45 mutants. In this study, we used three paramomycin hyper sensitive mutants, namely sup45-23, sup45-24 and sup45-38. Phenotypic characterization and quantitation of allosuppresor level showed that the mutants were allele specific mutants. Cloning and sequencing of the sup45 genes from these mutants showed that the sup45-23 exhibited Met48ATG → Ile48Ala and Gly431GGT → Gly431GGA mutation. While sup45-24 and sup45-38 exhibited single silent mutation, Gly431GGT → Gly431GGA . The structure-function analysis of sup45 gene of these mutant suggested that phenotypic mutants were not only due to the alteration of amino acid of eRF-1 protein in the cells.

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