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INDONESIA
Jurnal ILMU DASAR
Published by Universitas Jember
ISSN : 14115735     EISSN : 24425613     DOI : -
Core Subject : Science, Education,
Jurnal ILMU DASAR (JID) adalah jurnal ilmiah yang melingkupi bidang matematika, fisika, kimia dan biologi. Naskah yang diusulkan untuk diterbitkan Jurnal Ilmu Dasar adalah naskah yang belum pernah diterbitkan dan atau tidak sedang dipertimbangkan penerbitannya di majalah lain. Jurnal Ilmu Dasar menerima tulisan hasil penelitian dasar (bukan aplikasi) untuk bidang matematika, kimia, fisika, dan biologi. Naskah ilmiah ditulis dalam bahasa Indonesia atau dalam bahasa Inggris yang baik. Secara lebih detail dapat dilihat dari pedoman penulisan.
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Articles 14 Documents
Search results for , issue "Vol 9 No 2 (2008)" : 14 Documents clear
Computer Simulation of Pouring Grains Using Stick-Slip Model Hasan, Muhammad
Jurnal ILMU DASAR Vol 9 No 2 (2008)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

We applied the Stick-Slip model to simulate pouring grains processes via Granular Dynamics Simulation. The dynamics mechanism and the structure formation of the 2D and 3D systems are investigated. The results show that the shape of the generated piles in the 2D and 3D systems are similar when observed superficially, but the detailed structure and the dynamic behaviour leading to that structure are very different.
The S Robust Estimator in Seemingly unrelated Regression Model Suliyanto, Suliyanto
Jurnal ILMU DASAR Vol 9 No 2 (2008)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

Regression parameter estimation is mainly used to describe the effect of dependent variable to the response variable. On development of it, parameter estimation is also used to case of multivariate regression. Seemingly Unrelated Regression model is one of regression multivariate cases which has especially assumption, i.e., correlation between errors on the multivariate regression. Robust S is one of robust estimation methods. This estimation can be resistant in presence of outlier in the data. In this research, we studied about parameter estimation for Seemingly Unrelated Regression model using robust S. We applied the model obtained to General Electric and Westinghouse data from 1935 to 1954
Characterisation of Arsenic Distribution in the Contaminated Sediments Using Principal Component Analysis based on The Four-Step Extraction Protocol Muhammad, Damris
Jurnal ILMU DASAR Vol 9 No 2 (2008)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

The goal of this work was to characterize the distribution of arsenic in the contaminated sediments using principal component analysis to interpret data generated by a four-step extraction protocol, an operationally defined fractionation procedure used to study the availability and mobility of trace metals available in environmental solid samples. Sediment cores collected from contaminated site of Port Kembla Harbour, Australia were sliced into 2-cm thin layers. Each layer was sieved into three different grain sizes (<63μm, >63 μm and >250 μm) under inert N2 atmosphere. Redox potential, pH, dissolved As in the interstitial water, exchangeable As, AVS-As, reducible As, and residual As data provided some reliable information concerning the characteristics of As distribution in the contaminated sediments. Principal component analysis indicated As in the fine grain fraction and redox potential developed in the sediment contributed more significantly in controlling the concentration of dissolved As in the sediment interstitial water. It appeared that precipitation-dissolution reaction of As taken place in the sediment involved the fine grain solid phase and occurred actively at redox transition zone at which it changed significantly and the concentrations of dissolved As were high.
The Synthesis Study of Sulfanilamide Analogue from Natural Substances Papaverine Alkaloid Sudarma, I Made; Mulyanto, Mulyanto
Jurnal ILMU DASAR Vol 9 No 2 (2008)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

The aim of this research was to synthesize sulfanilamide analogue from natural products papaverine alkaloid. Sulfanilamide is known as an antibiotic which has been used for treatment of infection. Theoretically papaverine could be converted to be sulfanilamide analogue by two steps reactions, first sulfonation of papaverine by sulfonic acid to produce sulfonyl chloride and second reaction of with ammoniac to produce. The formation of this product was analyzed by analytical thin layer chromatography and FT-IR. This analysis showed the formation of product quite difficult since the compound was easily reacted with water to form compound. Infrared spectra supported the formation of which showed vibrations at 1153.4 and 1265.2 Cm-1 due to absorption of sulfonyl group and at 3433.1 Cm-1 due to absorption of –OH group.
Embedding Cycle Graphs Complements Susilowati, Liliek; Hendy, Hendy; Wayuni, Yayuk
Jurnal ILMU DASAR Vol 9 No 2 (2008)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

A graph is embeddable on a surface if it can be drawn on that surface without any edges intersect. The cycle graphs can always be embedded on the plane and the torus, but this is not occurred for their complements. We prove that the maximum order of cycle graphs such that their complements still can be embedded on the plane is 6. But, the maximum order of cycle graphs such that their complements still can be embedded on the torus is 9. Also, the crossing number of complements of cycle graphs which can’t be embedded on the plane with minimum order will be presented.
Nyale Sea Worm As Antibacterial Substances Dyah Jekti, Dwi Soelistya; Purwoko, Agus Abhi; Muttaqin, Zainul
Jurnal ILMU DASAR Vol 9 No 2 (2008)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

Nyale is a sea worm that belongs to class of polychaete. It appears on a huge crowd, usually five days after the monsoon in February, at the surface of the sea for breeding. The colors of the female and male worms are green and brown, respectively. The worms are collected in nyale season, freezed-dryer, and extracted with ethyl acetate. Antimicrobial activity properties of the male worm extract are carried out toward benthos bacteria and clinical isolate bacteria using ciprofloxacin as comparing agent. The results show that, after colom chromatography, fraction number 1 and 4 have the best antibacterial activities (broadest spectrum) toward clinical isolate bacteria. All eleven fractions show also antibacterial activities toward nine benthos bacteria. The minimum inhibitory concentration (MIC) of fractions 1 and 4 toward six clinical isolate bacteria is 100 μg/ml. Meanwhile, fraction 4 exhibits two peaks in its HPLC chromatrogram.
Cloning, Sequencing and Characterization of The Xylan Degrading Enzymes from Geobacillus thermoleovorans IT-08 Puspaningsih, Ni Nyoman Tri; Suwanto, Antonius; Suhartono, Maggy T
Jurnal ILMU DASAR Vol 9 No 2 (2008)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

Geobacillus thermoleovorans IT-08 is a Gram positive, thermophilic bacterium that can utilize xylan as a sole source of carbon. This strain was isolated from Gunung Pancar hot spring, Bogor, West Java, Indonesia. A plasmid genomic library in Escherichia coli DH5α was constructed and screened for xylanase activity. One positive clone, namely DH5α (pTP510) has been isolated, sequenced and showed putative exo-xylanase (exo-xyl), β-xylosidase (xyl), and α-L-arabinofuranosidase (abfa) genes (Genebank Accession No.DQ387047, DQ345777 and DQ387046 respectively). Each gene encoded 604, 511 and 502 amino acids, respectively. The BLAST search for protein database revealed that Abfa was high similar with GH51 family Abfa of Geobacillus stearothermophilus T6, but Xyl and Exo-Xyl were slight similar with GH43 family (25-34%) respectively. The deduced protein had a molecular weight of about 70 kDa (Exo-Xyl), and 60 kDa (Xyl and Abfa). These showed good accordance with the calculated molecular weight of each protein (68.64 kDa for Exo-xyl, 57.99 kDa for Xyl and 57.03 kDa for Abfa) from deduced amino acid sequence.
New Procedures for Model Selection in Feedforward Neural Networks for Time Series Forecasting Suhartono, Suhartono
Jurnal ILMU DASAR Vol 9 No 2 (2008)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

The aim of this paper is to propose two new procedures for model selection in Neural Networks (NN) for time series forecasting. Firstly, we focused on the derivation of the asymptotic properties and asymptotic normality of NN parameters estimator. Then, we developed the model building strategies based on statistical concepts particularly statistics test based on the Wald test and the inference of R2 incremental. In this paper, we employ these new procedures in two main approaches for model building in NN, i.e. fully bottom-up or forward scheme by using the inference of R2 incremental, and the combination between forward (by using the inference of R2 incremental) and top-down or backward (by implementing Wald test). Bottom-up approach starts with an empty model, whereas top-down approach begins with a large NN model. We used simulation data as a case study. The results showed that a combination between statistical inference of R2 incremental and Wald test was an effective procedure for model selection in NN for time series forecasting.
Alternative Model of Cellular Immune Reactions in Insect Sarjan, Muhammad
Jurnal ILMU DASAR Vol 9 No 2 (2008)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

The cellular immune reactions involve mainly the insect blood cells or hemocytes and consist of adhesive reactions of hemocytes against microbes or parasites. Among these various hemocytes, the granulocytes and plasmatocytes are thought to be the most important hemocytes involved in insect cellular defense. According to the number and size of the foreign invaders in the insect hemocoel, three major cellular defense reactions can be classified: Phagocytosis, encapsulation and nodule formation. Many of the initial interactions leading to coagulation and phagocytosis reactions in insects are sugar-lectin binding reactions, involving homeostasis- and defense-related receptors, such as scavenger receptors and mucin-like immune receptors. However, the mechanism that cause the formation of endocytotic vesicles are not known. The major aims of this study are 1) To test the induction of cell-spreading and macropinocytosis, 2) To investigate the role of lectins in coagulation reaction. The observations suggest that in the presence of lectins hemocytes can either form coagulation products, such as globules, or perform cellular functions, such as adhesion and macropinocytosis. Since coagulation and cell activities are quite disparate processes, the balance between the two types of reactions is quite relevant for the overall outcome. In cell-free hemolymph (plasma) only coagulation reactions occur in the presence of externally added GalNAc-specific lectins.
Comparison of Yeast Resazurin Versus MTT Assay in vitro Methods For Determining Acute Toxicity of Halogenated Alkanes Zuas, Oman
Jurnal ILMU DASAR Vol 9 No 2 (2008)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

Halogenated alkanes may have potentially human health effect as a result of their persistence, bioaccumulation and toxicity after their release from environment into the food chain and water products. It is leading to increase attention for legislation aimed at prevention and great pressure to reduce the production and emission rate of halogenated alkanes. Besides many research efforts to understand the fate and (eco)toxicological effects of the halogenated alkanes. Several investigators have used animal in vivo in conventional toxicity studies of halogenated alkanes. Nevertheless, experimental by using animal testing is always time and resource demanding. Thus, it is not deemed suitable for screening of large number of potential toxicants. The main objective of this work was to investigate the comparability of yeast resazurin assay versus MTT assay for determining in vitro acute toxicity (EC50) of halogenated alkanes. The MTT assay was conducted using Chinese Hamster Ovary (CHO cell), whilst yeast strains were used in yeast resazurin assay. The study demonstrates a comparability result to which halogenated alkanes is more toxic to CHO cell than to yeast cell.

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