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Journal of Mathematical and Fundamental Sciences
Published by Institut Teknologi Bandung
ISSN : 23375760     EISSN : 23385510     DOI : https://doi.org/10.5614/j.math.fund.sci.
Core Subject : Science, Education,
Astronomy Chemistry Earth & Planetary Sciences Mathematics Physics
Journal of Mathematical and Fundamental Sciences welcomes full research articles in the area of Mathematics and Natural Sciences from the following subject areas: Astronomy, Chemistry, Earth Sciences (Geodesy, Geology, Geophysics, Oceanography, Meteorology), Life Sciences (Agriculture, Biochemistry, Biology, Health, Medical, Pharmacy), Mathematics, Physics, and Statistics.
Arjuna Subject : Matematika - Matematika (Lain-Lain)
Articles 3 Documents
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Search results for , issue "Vol. 32 No. 2 (2000)" : 3 Documents clear
A Sequential Isolation and Isolate Identification of Thermophilic Oil Degrading Bacteria from Bangko Reservoir Megga Ratnasari Pikoli; Pingkan Aditiawati; Dea Indriani Astuti
Journal of Mathematical and Fundamental Sciences Vol. 32 No. 2 (2000)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Sari. Telah dilakukan isolari bakteri termofilik pendegradasi minyak bumi dari Sumur Bangko dengan cara bertahap karena prosedur isolasi biasanya belum tentu dapat mengisolasi bakteri pendegradasi secara lengkap. Isolasi tahap I dilakukan langsung dari crude oil di dalam medium basal Stone Mineral Salt Solution ditambah ekstrak ragi (SMSSe) pada 50 °C. Isolasi tahap II dan III dilakukan dari sumber isolat yang sama, medium basal dan kondisi kultur yang sama, tetapi medium pengisolasi diperkaya dengan minyak sisa degradasi (MSD) isolat campuran tahap sebelumnya. Pada tahap I diperoleh 4 isolat, yaitu Bacillus polynyxa, B. licheniformis, Bacilus sp.1, dan Pseudomonas aeruginosa; pada tahap II diperoleh 3 isolat, yaitu Bacillus sp.2, B. stearothermophllus, dan B. brevis; sedangkan pada tahap III hanya diperoleh 1 isolat, yaitu B. coagulans. Semua isolat ini nantinya digunakan untuk mendegradasi crude oil. A Sequential Isolation and Isolate Identification of Thermophilic Oil Degrading Bacteria from Bangko ReservoirAbstract. A study on the isolation of thermophilic oil-degrading bacteria from the crude oil (petroleum) of Banko reservoir has been conducted on a sequential way. The conventional isolation procedure did not isolate the bacteria completely. The first isolation stage was performed directly on the crude oil sample by using Stone Mineral Salt Solution plus yeast extract (SMSSe), as basal medium, at 50°C. The second and third isolation stages used the same source, basal medium, and condition as the first stage, but were enriched with a depleted-oil obtained from the crude oil degraded from the previous stage's mixed culture bacteria. Four bacterial isolates were recovered from the first isolation stage, identified as Bacillus polymyxa, B. Licheniformis, Bacillus sp.1, and Pseudomonas aeruginosa. The second stage gave another three different bacterial isolates, identified as Bacillus sp.2, B. stearothermophillus, and B. brevis; whereas the third stage gave only one isolate namely Bacillus coagulans. These isolates could be applied for the degradation of crude oil.
Study on the Making of Blended Cement by Mixing Granulated Blast Furnace Slag with Portland Cement Clinker Arief Sudarsono; Kris M. Kosasih
Journal of Mathematical and Fundamental Sciences Vol. 32 No. 2 (2000)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract. This paper presents the results of laboratory into the effect of slag fineness and slag composition added to portland cement clinker, to the compressive strength of the paste. The results showed that slag of 4260 cm2/gram fineness can be added up to 3O% to a portland cement clinker to increase compressive strength from 28 MPa to about 40 MPa. Scanning electron micrograph of the pastes showed that the inter granular voids between slag particles and sand particles were densely filled with line CaO-SiO2-H2O gel after 28 days observation, and in case clinker without slag, densification of CaO-SiO2-H2O gel still left pores even after 23 days of observation. The fineness of slag is more important than its composition in the blended cement. Studi Pembuatan Semen Campur (Blended Cement) dari Campuran Terak Tanur Tiup dan Klinker Semen PortlandSari. Paper ini menyajikan hasil percobaan laboratorium yang meneliti pengeruh kehalusan terak dan komposisi terak yang ditambahkan ke dalam klinker semen Portland. Hasil percobaan menunjukkan bahwa terak dengan kehalusan 4260 cm2/gram dapat ditambahkan ke dalam klinker sampai maksimum 30%, untuk meningkatkan kuat tekan dari semula 28 Mpa menjadi 40 Mpa. Foro SEM menunjukkan bahwa kekosongan antarbutir partikel terak dengan partikel pasir terisi dengan baik oleh pasta halus CaO-SiO2-H2O setelah pengamatan selama 28 hari. Untuk klinker tanpa terak, pasta masih mempunyai pori mesipun setelah 28 hari pengamatan. Kehalusan terak lebih penting daripada komposisinya di dalam semen campur.
Artelastokromen Suatu Diprenilpiranoflavon dan B-Resorsilaldehid dari Kayu Batang Artocarpus Lanceifolius Didin Mujahidin; Sjamsul Arifin Achmad; Yana Maolana Syah; Euis Holisotan Hakim; Lukman Makmur; Norio Aimi; Mariko Kitajima; Hiromitsu Takayama; Rusjdi Tamin
Journal of Mathematical and Fundamental Sciences Vol. 32 No. 2 (2000)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstrak. Dua senyawa, yaitu artelactokromen (1), suatu diprenil piranoflavon, dan B-resorsilaldehid (2) telah ditemukan untuk pertama kalinya pada kayu batang tumbuhan Artocarpus lanceifolius Roxb. (Moraceae), suatu tumbuhan langka yang endemic untuk Indonesia dan dikenal dengan nama Keledang. Struktur molekul kedua senyawa tersebut telah ditetapkan berdasarkan data fisika dan spektroskopi (MS, 1H dan 13C NMR). Baik artelastokromen (1) maupun B-resorsilaldehid (2) tidak terlalu toksik terhadap nauplii udang Artemia salina Leach., masing-masing dengan LC50 298,2 dan 79,7 ug/mL. Artelastochromene a Diprenylphyranoflavone and Î’-Resorcylaldehyde from the Wood Trunk of Artocarpus LanceifoliusAbstract. Two phenolic constituent, namely artelastochromene (1), a diprenyl pyranoflavone, and β-resorcylaldehyde (2) had been isolated from the wood trunk of Artocarpus lanceifolius Roxb. (Moraceae), an endemic species of Indonesia, locally known as Keledang. The structures of both compounds were elucidated based on physical and spectroscopic data (MS, 1H and 13C NMR). Both artelastochromene (1) and β-resorcylaldehyde (2) showed very slight toxic effect against shrimp nauplii Artemia salina Leach., LC50 298,2 and 79,7 μg/mL, respectively.

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