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Jurnal Ilmu Dasar
Published by Universitas Jember
ISSN : 24425613     EISSN : -     DOI : https://doi.org/10.19184/jid.v24i2.36657
Core Subject : Education, Engineering,
Control & Systems Engineering Mathematics
Jurnal ILMU DASAR (JID) is a national peer-reviewed and open access journal that publishes research papers encompasses all aspects of natural sciences including Mathematics, Physics, Chemistry and Biology. JID publishes 2 issues in 1 volume per year. First published, volume 1 issue 1, in January 2000 and avalaible in electronically since 2012 with ISSN 1411-5735 (Print) and avalaible in electronically since 2012 with ISSN 2442-5613 (online). Jurnal ILMU DASAR is accredited SINTA 3 by the Ministry of Education, Culture, Research, and Technology of the Republic of Indonesia (Kemendibukristek) No. 152/E/KPT/2023 (September 25, 2023), Ministry of Research, Technology and Higher Education of the Republic of Indonesia (RISTEKDIKTI), No. 200/M/KPT/2020 (December. 23, 2020). All accepted manuscripts will be published worldwide JID has been indexed in DOAJ, Dimension, OCLC WorldCat, PKP Index, Crossref, Google Scholar, Base, Garuda, and OneSearch. JID have been collaborated in KOBI-ID (Konsorsium Biologi Indonesia) and HKI (Himpunan Kimia Indonesia) since 2017.
Arjuna Subject : Matematika - Kontrol dan Optimasi
Articles 13 Documents
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Search results for , issue "Vol 9 No 1 (2008)" : 13 Documents clear
Effect of Reaction Temperature and the CPO/Metanol Ratio on the Product Characteristics in the Biodiesel Production Using Diethyl Eter as Co-Solvent Puguh Setyopratomo; Edy Purwanto; Rudy Hartanto; J Kristianto
Jurnal ILMU DASAR Vol 9 No 1 (2008)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

In this research Crude Palm Oil (CPO) and methanol were reacted by applying 5 % basic catalyst (KOH) and adding diethyl ether as co-solvent to produce methyl ester (biodiesel). Co-solvent was added in order to form one-phase reaction mixture, and then higher reaction rate was expected compare with two-phase system. Reaction was carried out batch wise in 1 litre glass reactor stirred continuously at 300 rpm. The objective of this research is to obtain the characteristic of biodiesel product. The advantage using this methode was showed by several characteristics of the biodiesel product. The density and viscosity had achieved the commercial biodiesel standard, this biodiesel product has higher flash point of the product compared with solar, which means lower risk factor during storage. The very low sulfur content and the pour point of product that was layed below the maximum allowable limit, are environmentally favorable. 
Preliminary Investigation: StearidoStudi Pengaruh Pengadukan dan Tanpa Pengadukan Larutan Elektrolit Terhadap Struktur Kristal, Morfologi dan Rasio Magnetoresistansi Lapisan Tipis Paduan NiFe Hasil Elektrodeposisinic Acid Production by Genetically Modifie Fahru Nurosyid; Nuryani Nuryani; Budi Purnama; Luthfiana Asry Ayuni
Jurnal ILMU DASAR Vol 9 No 1 (2008)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

Ni-Fe alloy thin film on Cu substrate by electro-deposition method has been made without as well as with agitation of 300 rpm for a 3 minutes deposition time and potential of 3 Volt. The characterizations consist of crystal structure test by X-Ray Diffraction method, morphology and composition test by SEM/EDX and magnetoresistance measurement with two-point probes equipment. Result of the XRD test showed that the growth of crystal structure was in the same orientation on 111, 200, 220, 311with structure of fcc. Morphology test showed that the structural images of Ni-Fe surface thin film on agitation became flat and had less grain size. The composition test results showed that composition with agitation closely Ni80Fe20 (permalloy) was 87.51% for Ni and 12.49% for Fe. The magnetoresistance measurement was less with the agitation treatment i.e. without agitation was 9.1 % and with agitation was 1.9 %.
Are Bacteria The Main Producers of Hydrolytic Enzymes in Aquatic Environment Kartika Senjarini; Ulf Karsten; Rhena Schumann
Jurnal ILMU DASAR Vol 9 No 1 (2008)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

Bacteria play an important role in the decomposition of organic matter, which is a key process in aquatic microbial food webs as well as its application in water bioremediation processes. DOM (Dissolved Organic Matter) is the major fraction of organic matter in most aquatic environments. Most of DOM is present as high molecular weight compounds that cannot be taken up by bacteria directly. Therefore, they must be hydrolysed enzymatically to be transported across microbial cell membranes. Molecular fluorosensors have been used as artificial substrates to study hydrolytic enzymes in situ. The present study wants to investigate the following hypothesis i.e. bacteria are the main producers of hydrolytic enzyme in aquatic systems. There were not any significant correlations between bacteria and the investigated hydrolases (esterase, peptidase, and β-glucosidase) in the meso- to eutrophic aquatic systems near Rostock city – North East Germany, although a wide range of bacterial abundances were covered. Enzyme saturations were not detected in all samples which may be explained by a high KM indicating a low affinity of enzymes (1) and or the contribution of many enzymes with different kinetics to the respective substrate degradation (2). There is also increasing evidence that bacteria may not be the sole or dominant source of esterases, peptidases and β-glucosidases in aquatic ecosystems. Invertebrate, fungi and other eukaryotes (diatoms, protozoa etc.) must be considered as possible and even important producers of hydrolytic enzymes. Several other factors may influence the correlations of bacteria to hydrolytic enzyme activities, i.e. variations in the species composition (1), a wide ranged variability of hydrolytic activities influenced directly by other substrates (low enzyme affinity), element availability (N and P), temperature and other abiotic factors (2), the existence and persistence of enzymes caused by other (passive) processes (e.g. cell lysis) (3).
Status Analysis of Flora from ”Cagar Alam – Pulau Sempu”, Malang Hari Sulistyowati
Jurnal ILMU DASAR Vol 9 No 1 (2008)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

The Natural reserve of Sempu Island is one of protected areas in East Java. There are many endemic flora and fauna of Tropical Rain Forest. However, there is a rumor that the government will use this protected area as a County Jail. Based on this condition, it is important to investigate specifically the flora status of Sempu Island. The result can be used to give a lot of information about the endemic, existence, list of endangered, uniqueness, and also qualification values of the flora of Sempu Island as Biodiversity Species Richness of East Java and Indonesia. The plotting method of 1×1m2 , 5×5m2, and 10×10m2 were used to get the sample data of herbs, shrubs, and trees. The plots were placed systematically along transects. The result shows that 54.54% qualification values among the fifty five flora of Sempu Island were unique, 32.73% were very unique, and the rest were enough. Meaning, most of the flora was species that have high endangered and endemicness levels. Based on the IUCN (International Union for Conservation of Nature and Natural Resources) procedure conservation, therefore entire flora must be protected and conserved. Furthermore, the reserved island could not be converted as a County Jail. 
Chemicals Identification Related To The Chemical Weapons Convention During The 15th Interlabory Proficiency Test Sri Sumartini; Harry Budiman; Nuryatini Nuryatini; Puspa Dewi
Jurnal ILMU DASAR Vol 9 No 1 (2008)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

Identification of some chemical weapons in the water and organic sample has been carried out during 15th proficiency testing hold by OPCW (Organisation Prohibition of Chemical Weapon). Sample preparation method was adopted from Recommended Operational Procedure (ROP) from OPCW and Helsinki University, Finlandia. Prepared sample was identified by gas chromatography (FID and FPD), gas chromatography mass spectrometry (EI and CI mode) and Liquid chromatography mass spectrometry method.. From 7 spiking chemical weapons introduced to water and organic sample, 3 spiking chemicals could be identified (propylphosphonic acid, isoprophylphosphonic acid and 1,4 Bis 2-chloroethyl (thio) butane). One chemical was reported as Butyl S-2-diisopropylaminoethyl propylphosphonothiolate but obviously this is not a spiking chemical (category false positive identification).
Statistical Inference for Modeling Neural Network in Multivariate Time Series Dhoriva Urwatul Wutsqa; Subanar Subanar; Suryo Guritno; Zanzawi Soejoeti
Jurnal ILMU DASAR Vol 9 No 1 (2008)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

We present a statistical procedure based on hypothesis test to build neural networks model in multivariate time series case. The method involved strategies for specifying the number of hidden units and the input variables in the model using inference of R2 increment. We draw on forward approach starting from empty model to gain the optimal neural networks model. The empirical study was employed relied on simulation data to examine the effectiveness of inference procedure. The result showed that the statistical inference could be applied successfully for modeling neural networks in multivariate time series analysis.
An Isoflovonoid, Warangalone from the Stem Bark of Dadap Ayam (Erythrina variegata) Tati Herlina; Nasrudin Nasrudin; Unang Supratman; Anas Subarnas; Supriyatna Sutardjo; Hideo Hayashi
Jurnal ILMU DASAR Vol 9 No 1 (2008)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

In the course of our continuing search for novel paralytic compound from Indonesian plants, the methanol extract of the stem bark of Erythrina variegata (Leguminosae) showed significant paralytic activity against the third instar larvae of silkworm (Bombyx mori). The purposes of this research were isolation and structural elucidation of paralytic compound from the stem bark of E. variegata. Using the paralytic activity following the separation, the methanol extract was separated by combination of column chromatography to yield prenylisoflavone, warangalone. The chemical structure of warangalone was identified based on spectroscopic evidence and comparison with the previous reported. The paralytic activity of warangalone showed weak activity against the third instar larvae of silkworm (B. mori).
Determination of Subsurface Structure of Landslide Area According to Interpretation of Resistivity Data Supeno Supeno; Nurul Priyantari; Gusfan Halik
Jurnal ILMU DASAR Vol 9 No 1 (2008)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

Resistivity method is a useful geophysical tool for investigating landslides. It can be used to estimate the subsurface structure of a landslide mass, the depth of the failure surface, and the lateral extent of a landslide. High resolution of resistivity data were obtained by applying Schlumberger configuration, while penetrating deepness was obtained by applying Vertical Electrical Sounding (VES) configuration. Interpretation of subsurface condition showed there was soil layer in survey area which was indicated as slip surface triggering the landslide.
Synthesis of a Sunscreen Compound n-Octyl Para-Menthoxy Cinnamat using Ethyl Para-Methoxy Cinnamat Isolated from Kencur Tuber (Kaemferia galanga L.) as Raw Material Nurul Hidajati; Suyatno Suyatno
Jurnal ILMU DASAR Vol 9 No 1 (2008)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

A sunscreen compound namely n-octyl para-methoxy cinnamat (OPMC) had been synthesized from the ethyl para-methoxy cinnamat (EPMC) isolated from the kencur tuber (Kaemferia galanga L.) as the raw material. The convertion of EPMC to OPMC was conducted by hydrolysis reaction of EPMC using the alcoholic KOH solution catalyst to yield para-methoxy cinnamat acid (PMCA). Futhermore, the esterification reaction of PMCA and n-octanol, using the concentrated sulfuric acid catalyst produced OPMC as a colorless needle crystal with rendemen 53.98%. The molecular structure of OPMC was identified by spectroscopic methods including UV, IR, 1H-NMR, and EIMS.
Preliminary Investigation: Stearidonic Acid Production by Genetically Modified Saccharomyces cerreviseae Using Linseed Oil as A Fatty Acid Source Kahar Muzakhar
Jurnal ILMU DASAR Vol 9 No 1 (2008)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

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Abstract

Stearidonic acid (SDA); 18:4(n-3), an ω-3 Polyunsaturated Fatty Acid (PUFA), could be produced by Genetically Modified Saccharomyces cerreviseae (GMY) using Linseed Oil (LO) as fatty acid source. In nature, S. cerrevisae accumulates only very small amount lipid and contains until mono unsaturated fatty acids. But this GMY strain beside has capability to accumulate lipid, it also contains Δ6 desaturase gene which leads to convert α-Linolenic Acid (ALA); 18:3(n-3) to be SDA. Gas Chromatograph analysis of transmethylated LO sample showed that main component of fatty acid was ALA (about 57%), therefore LO can be used as a cheap source for other PUFA production. In order to provide ALA as a source for the yeast, enzymatic hydrolysis of LO using lipase was done. The lipase from Rhizomucor miehei (L4277-SIGMA) showed the highest activity among 5 lipases when 1 g/L LO in the medium for yeast (containing 6.7g/L yeast nitrogen base, 20 g/L glucose and 2.5g/L tergitol NP-40) was hydrolyzed. For SDA production, 1g/L LO in medium was aseptically hydrolyzed by lipase in 50 unit/mL for 18 hours at 30 oC and 140 rpm. The pre-culture of GMY (1% V/V) was then inoculated into the treated medium and 2.59 g/L dried cells were obtained after 5 days cultivation. ALA was accumulated in the cells at 0.06g/L (11% of total ALA in LO), and only 25% (0.015g/L) of accumulated ALA were converted to SDA. These results suggested that LO can be used as a source for PUFA production. In order to improve the productivity of SDA using GMY, hydrolysis of LO as well as cultivation condition and genetically improvement of the yeast must be highly considerated.

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