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INDONESIA
Indonesian Journal of Biotechnology
Published by Universitas Gadjah Mada
ISSN : 08538654     EISSN : 20892241     DOI : -
Core Subject : Science,
Biochemistry, Genetics & Molecular Biology Immunology & microbiology Materials Science & Nanotechnology
The Indonesian Journal of Biotechnology (IJBiotech) is an open access, peer-reviewed, multidisciplinary journal dedicated to the publication of novel research in all aspects of biotechnology, with particular attention paid to the exploration and development of natural products derived from tropical—and especially Indonesian—biodiversity. IJBiotech is published biannually and accepts original research articles featuring well-designed studies with clearly analyzed and logically interpreted results. A strong preference is given to research that has the potential to make significant contributions to both the field of biotechnology and society in general.
Arjuna Subject : -
Articles 6 Documents
 1 
Search results for , issue " Vol 14, No 1 (2009)" : 6 Documents clear
Production of Poly--hydroxybutyrate (PHB) from Sago Starch by The Native Isolate Bacillus megaterium PSA10 Yanti, Nur Arfa; Sembiring, Langkah; Margino, Sebastian
Indonesian Journal of Biotechnology Vol 14, No 1 (2009)
Publisher : Universitas Gadjah Mada

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Abstract

A new bacterial strain that produces amylase and poly-a-hidroxybutyrate (PHB) using sago starch as carbon source was characterized and identified to be member of the Bacillus megaterium group based on phenotypic characteristics  and 16S rDNA gene sequences. Amylase activity was determined spectrophotometrically on the basis of substrate concentration reduction. PHB production was quantified with UV spectrophotometer. The polymer produced by B. megaterium PSA10 was identified by  Fourier Transform Infrared spectroscopy (FTIR). The result of the study showed that the amylase specific activity B. megaterium PSA10 was 593,61 DUN/mg protein and PHB production from sago starch was 52,28 % of cell dry weight (CDW). FTIR analysis of the polymer indicated that the strain B.megaterium PSA10 was a potent PHB producer.
Ethanolic Extract of Hedyotis corymbosa L. Increases Cytotoxic Activity of Doxorubicin on MCF-7 Breast Cancer Cell Haryanti, Sari; Junedi, Sendy; Meiyanto, Edy
Indonesian Journal of Biotechnology Vol 14, No 1 (2009)
Publisher : Universitas Gadjah Mada

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Abstract

Hedyotis corymbosa L. with ursolic acid as the main compound is one of the plants that has been used for traditional medicine including to cure breast cancer disease. The aim of this research is to examine the cytotoxic activity of rumput mutiara herb ethanolic extract (ERM) and its effect in combination with doxorubicin against MCF-7 breast cancer cell line as cell model of doxorubicin resistance. Hedyotis corymbosa L. herb powder extraction was done by maceration using ethanol 96% then the extract is detected for ursolic acid content. Cell viability assay of ERM, doxorubicin and  the combination of ERM and doxorubicin treatments were carried out by MTT assay to determine IC50 and CI (Combination Index). Cell cycle distribution was determined by flowcytometry. Apoptosis assay was performed by ethidum bromide-acridine orange DNA staining method. Investigation on Bcl-2 expression was determined by immunocytochemistry method. Thin Layer Chromatography of ERM had similar Rf with ursolic acid standard: 0,6. ERM and doxorubicin inhibited cell growth against MCF-7 with IC50  of 77 µg/mL and 349 nM (0,19 µg/mL) respectively. Combination of ERM and doxorubicin showed synergistic effect (CI 0.66-0.99). Combination of 25 ìg/mL ERM- 200 nM doxorubicin induced apoptosis and decreased Bcl-2 expression but showed no cell accumulation on cell cycle. Doxorubicin induced high cell accumulation in G2/M phase, but ERM at the concentration of 25 ìg/mL had a low effect in G1 phase, and ERM IC50 did not induce cell accumulation otherwise apoptosis. These results concluded that the apoptosis mechanism of combination doxorubicin-ERM is mediated by cell cycle arrest and non cell cycle arrest. Therefore ERM has a potential activity to be developed as co-chemotherapeutic agent.  
Cloning and Sequence Analysis of Capsid Protein Gene of Iridovirus Indonesian Isolates ., Murwantoko; Handayani, Christina Retna; Pratiwi, Rarastoeti
Indonesian Journal of Biotechnology Vol 14, No 1 (2009)
Publisher : Universitas Gadjah Mada

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Abstract

Iridovirus was known as agents that caused serious systemic disease in freshwater and marine fishes. The mortality up to 100% of orange-spotted grouper (Epinephelus coioides) due to iridovirus infection has been reported in Indonesia. The gene encoding capsid protein of iridovirus is supposed to be conserved and has the potency for the development of control methods. The objectives of this study are to clone the gene encoding capsid protein iridovirus and to analyze their sequences. The   spleen tissues of orange-spotted grouper were collected and extracted their DNA. The DNA fragment of capsid protein of iridovirus genes were amplified by PCR using designed primers with the extraction DNA as templates. The amplified DNA fragments were cloned in pBSKSII and sequenced.  The genes encoding capsid protein of iridovirus from Jepara and Bali were successfully amplified and cloned. The Jepara clone (IJP03) contained complete open reading frame (ORF) of the gene composed by 1362 bp nucleotides which encoded 453 amino acids. Those Jepara and Bali (IGD01) clones shared 99.8% similarity in nucleotide level and 99.4% at amino acid level. Based on those sequences, Indonesian iridovirus was belonged to genus Megalocystivirus and shared 99,6-99,9% similarity on nucleotide level with DGIV, ISKNV, MCIV, and ALIV
Analysis of Toxoplasma gondii Repeat Region 529 bp (NCBI Acc. No. AF146527) as a Probe Candidate for Molecular Diagnosis of Toxoplasmosis Pratama, Dyah Ayu Oktavianie A; ., Sumartono; Artama, Wayan T.
Indonesian Journal of Biotechnology Vol 14, No 1 (2009)
Publisher : Universitas Gadjah Mada

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Abstract

            Toxoplasmosis is a disease caused by protozoan parasite Toxoplasma gondii. The infection is commonly asymptomatic. The availability of confirmative and accurate detection system is really needed. This research was aimed to develop a molecular diagnosis based on the conserved and high copy number repeat region of Toxoplasma gondii with hibridization method. Nucleic acid was isolated from tachyzoites. The repeat region of T. gondii was amplified using PuRe Taq Ready To Go-PCR Beads (Amersham Bioscience),  forward primer 5’- GAC TCG GGC CCA GCT GCG  -3’ and reverse primer 5’- CCT CTC CTA CCC CTC CTC -3’. The amplicon was sequenced using ABI Prism 3100-Avant Genetic Analyzer (PT. Charoen Pokphand, Jakarta). Probe was labeled using digoxigenin-11-dUTP. Application of probe to detect it’s complementary nucloeic acid was done by hibridization method. The research concluded that probe toxo-103 bp was highly homolog with several strain of T. gondii and it has no homology either with host’s genome or other parasites which have close genetic relationship with T. gondii.   Hybridization analysis showed that probe could detect the complementary nucleic acid up to 10 ng/ul concentration.      
Isolation and Screening of Antimicrobial Producing-Actinomycetes Symbionts in Nudibranch ., Riyanti; Widada, Jaka; Rajasa, Ocky Karna
Indonesian Journal of Biotechnology Vol 14, No 1 (2009)
Publisher : Universitas Gadjah Mada

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Abstract

         The aims of  this study were to isolate and to screen actinomycetes associated with sea slug which have the ability to produce antimicrobial compound, especially against MDR strains. Actinomycetes were isolated from nudibranchs collected from Bandengan coastal waters and the Panjang island, Jepara, Central Java. Actinomycete isolates were assayed for their antimicrobial activity against MDR strains (MDR 6 E. coli, MDR 7 Enterobacter sp., MDR 13 Proteus sp., MDR 14 Staphylococcus sp.). The genetic diversity of the active isolates was analyzed by using repetitive DNA fingerprinting.  Antimicrobial activity was also performed on the  ethyl acetate bacterial extract.  The amplification of Polyketide Synthase-I (PKS-I) and Non-Ribosomal Peptide Synthetase (NRPS) genes was carried out to estimate the genetic potency of actinomycetes. The most active actinomycete isolate was sequenced based on 16S rDNA approach. General profile of antimicrobial substances was analyzed by using Thin Layer Chromatography (TLC). A total 27 isolates were obtained from nudibranchs Jorunna sp. and 12 isolates from Chromodoris sp.  Ten isolates exhibited antimicrobial activity. Five representative isolates were selected based on rep-PCR analysis.  Three ethyl acetate extracts exhibited antimicrobial activity against MDR 7, MDR 13, and MDR 14, except MDR 6. NPC 8 isolates significantly inhibited the growth of the tested strain   and amplified NRPS gene fragment. Molecular identification revealed that isolate NPC 8 closely related to Streptomyces sp with a high homology of 96%.
Effects of Dissolved Oxygen Tension and Ammonium Concentration on Polyhydroxybutyrate Synthesis from Cassava Starch by Bacillus cereus IFO 13690 ., Margono; ., Rochmadi; Syamsiah, Siti; Cahyanto, Muhammad Nur
Indonesian Journal of Biotechnology Vol 14, No 1 (2009)
Publisher : Universitas Gadjah Mada

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Abstract

Attempting to get low price of raw material for producing polyhydroxybutyrate is always studied. Tapioca starch is one of the raw material with low price. The objective of this research was to study the effects of initial ammonium concentration and dissolved oxygen tension (doT) on producing PHB by Bacillus cereus IFO 13690 with tapioca starch as the carbon source. This fermentation was carried out in 5 L fementors with a 2 L working volume, temperature of 30 oC, and agitation of 500 rpm. The pH medium was controlled at 5.6 after it came down from the initial pH of 6.8. Meanwhile, the initial doT was 100 % air saturation and also came down to and maintained at doT of experiment, i.e. 1 , 5 , or 10 % air saturation. The best result was obtained when the initial ammonium concentration was 5 g/L and the doT value maintained at 5 % air saturation. By this conditions, the cell growth reached 5,457 g cell dry weight/L containing PHB of 2.42 % cell dry weigh after 29 hours fermentation.

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