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Jurnal Matematika & Sains
Published by Institut Teknologi Bandung
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
Arjuna Subject : -
Articles 5 Documents
 1 
Search results for , issue " Vol 14, No 2 (2009)" : 5 Documents clear
Efektivitas Teknik Kultur menggunakan Sistem Kultur Statis, Semi-kontinyu, dan Kontinyu terhadap Produktivitas dan Kualitas Kultur Spirulina sp. Gede Suantika; Deri Hendrawandi
Jurnal Matematika & Sains Vol 14, No 2 (2009)
Publisher : Institut Teknologi Bandung

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Abstract

Cyanobacteria, Spirulina sp., is used in many industries such as aquaculture, medical, and food industry due to its high nutrient level such as protein, fatty acid, vitamin, and antioxidant. In this experiment, three different culture techniques of batch culture, semi-continuous culture, and continuous culture were tested and developed in order to evaluate their effects on Arthrospiras culture production. During 24 days of culture period, batch culture biomass produced was 6.53±0.16 g, semi-continuous culture was 7.51±0.22 g, and continuous culture was 5.42±0.02 g. The highest contaminant presence was obtained in continuous culture, the highest pH level was found in semi-continuous culture. The highest concentration of nitrate, nitrite, ammonium, and orthophosphate was measured in continuous culture. Based on the result, it can be concluded that semi-continuous culture can produce highest biomass for 24 days culture period with a total production of biomass was 7.51±0.22 g and can maintain the stability of water quality.
Extracellular Products of Streptococcus pyogenes and Their Involvement in Pathogenesis Debbie Soefie Retnoningrum
Jurnal Matematika & Sains Vol 14, No 2 (2009)
Publisher : Institut Teknologi Bandung

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Abstract

Streptococcus pyogenes or group A streptococcus (GAS) is an exclusive human pathogen. To be a successful pathogen, this pathogen is equipped with various surface-exposed and secreted virulence factors. The functions of secreted virulence factors are particularly important since they interact with host components to establish infections and cause diseases in human. They include a number of proteases, DNase, superantigens, and plasminogen activator. How these secreted factors interact with host protein(s) define this pathogens ability to bring out various diseases. Several proteases act independently to target immunoglobulin molecules in order to evade host defense system and modulate host proteins to induce host-mediated damages. Besides producing proteases, many pathogenic strains of GAS also produce DNase; however, its involvement in host pathogenesis remains elusive. Superantigen, another secreted protein is responsive for serious host-destruction by bypassing antigen presentation to induce massive production of cytokines. GAS also secretes a plaminogen activator, streptokinase that is crucial for invasiveness. All together, secreted products of this pathogen work in concert to pinpoint different targets in order to destroy and or to disable human defense system and cause host damages.
Mengembangkan Kemampuan Mahasiswa dalam Memvalidasi Bukti pada Aljabar Abstrak melalui Pembelajaran Berdasarkan Teori APOS I Made Arnawa
Jurnal Matematika & Sains Vol 14, No 2 (2009)
Publisher : Institut Teknologi Bandung

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Abstract

This is an experimental study using control group pretest posttest design. The experiment group is treated using APOS theory instructional. The control group is treated using conventional/traditional mathematics instruction (TRAD). The main purpose of the study is to analyze the contribution of APOS in developing student ability to validate proof in Abstract Algebra. This experiment involves 180 students as research subjects from two different universities that is department of mathematics UNAND and department of mathematics educations UNP. The data was gathered by proof validated test. Based on the result of data analysis, the main result of this study is: ability in proof validated of students in APOS group is significantly better than the students in TRAD group.     
Micelle Formation and Surface Adsorption of Sodium 4-Octyl Benzene Sulfonate (S4OBS) in Water Solvent Muhammad Rusdi
Jurnal Matematika & Sains Vol 14, No 2 (2009)
Publisher : Institut Teknologi Bandung

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Abstract

The surface tension was measured against the concentration of S4OBS at temperatures of 300.2, 308.2, and 318.2 K, from which the critical micelle concentration (CMC) was determined. The CMC decreased with increasing temperatures. The thermodynamic parameters (DGo, DHo and DSo) of the micelle formation were calculated from the temperature dependence of CMC and the micellization was found to be entropy-driven. The surface excess concentration (G) was also determined from the change in the surface tension with the concentration from which the molecular surface area (A) below the CMC was evaluated. The molecular surface area suggests that thermal agitation at higher temperature more dominant than at lower temperature. The positive entropy change (DSo) for the surface adsorption decreased and stayed almost constant with increasing concentration of S4OBS.
Theoretical Prediction of Mixing Efficiency in Stratified Shear Exchange Flows Tjipto Prastowo
Jurnal Matematika & Sains Vol 14, No 2 (2009)
Publisher : Institut Teknologi Bandung

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Abstract

Mixing efficiency in stratified shear exchange flows between two reservoirs of water of differing densities is analytically investigated in detail in the light of a two-layer flow. The theoretical prediction of mixing efficiency is presented here in terms of a scaling analysis developed for such flows. The prediction is compared with that derived from measurements of normalised density profiles. The predicted mixing efficiency is found to be 0.125, independent of flow conditions and external parameters used. This value is approximately the same as 0.12, obtained from the averaged density profiles, and is close to a half of 0.2, the widely proposed value for the average efficiency in the oceans that is frequently assumed in general ocean circulation modeling.

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