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kPERHIMPUNAN MIKROBIOLOGI INDONESIA (SeKretariat PERMI), Gedung 10.2 Indonesian Life Sciences Center (ILSC), Zona Bisnis Teknologi Puspiptek, Jalan Raya Serpong - Bogor Gunung Sindur, Jawa Barat 16340, Indonesia. Email: microbiology.indonesia@gmail.com
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Microbiology Indonesia
Published by Perhimpunan Mikrobiologi Indonesia
ISSN : 19783477     EISSN : 20878575     DOI : -
Core Subject : Health, Science,
Biochemistry, Genetics & Molecular Biology Immunology & microbiology Medicine & Pharmacology
Microbiology Indonesia provides a unique venue for publishing original researches in microbiology (espesially from Indonesian reseachers), and ensures that authors could reach the widest possible audience. Microbiology Indonesia publishes a wide range of research disciplines on bacteria, archaea, fungi, protozoa, and virus as well as biotechnology related to microbiology. Topics include (but are not limited to): -methods in microbiology, -bioprocess, -environmental microbiology, -food microbiology, -plant-microbe interaction, -animal-microbe interactions, -microbial community, -microbial genetics, -virology, -comparative and functional microbial genomics, -and gene expression in microbes.
Arjuna Subject : Imunologi dan Mikrobiologi (semua kategori) - Mikrobiologi dan Bioteknologi Terapan
Articles 398 Documents
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The Production of Tannin Acyl Hydrolase from Aspergillus niger YUNITA ARIAN SANI ANWAR; . HASIM; I MADE ARTIKA
Microbiology Indonesia Vol. 1 No. 2 (2007): August 2007
Publisher : Indonesian Society for microbiology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (56.212 KB) | DOI: 10.5454/mi.1.2.9

Abstract

The aim of this research was to produce tannin acylhydrolase (tannase) from Aspergillus niger isolated from cacao pod. The first step of the study included determination of optimal pH, temperature, and incubation period to produce tannase. Optimal conditions obtained for tannase production were pH 5.5, a temperature of 28 oC and an incubation period of 3 days. Optimization of production medium was conducted. The media tested were solid and liquid wheat flour media with a concentration of tannic acid as inducer at 0, 3, 5, and 7% (wt/vol). The best production medium was solid medium with tannic acid concentration of 5% (wt/vol).
The Effects of Xanthorrhizol on the Morphology of Candida Cells Examined by Scanning Electron Microscopy YAYA RUKAYADI; JAE-KWAN HWANG
Microbiology Indonesia Vol. 1 No. 2 (2007): August 2007
Publisher : Indonesian Society for microbiology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1504.15 KB) | DOI: 10.5454/mi.1.2.11

Abstract

The effects of xanthorrhizol, a natural anticandidal agent isolated from the rhizome of temulawak or java turmeric (Curcuma xanthorrhiza Roxb.) on the morphology of four human pathogenic Candida species, i.e., C. albicans, C. glabrata, C. guilliermondii, and C. parapsilosis was examined by scanning electron microscopy (SEM). The SEM analysis showed that, unlike control cells representing normal oval to spherical with smooth surface, treatment of Candida strains with xanthorrhizol at 1 x MICs (minimum inhibitory concentration) significantly affected the external morphology, exhibiting deformation, and protrusions on the cell surface. The potent anticandidal activity of xanthorrhizol may support the use of medicinal plants for the treatment of candidal infections.
Recent Developments in the Bioconversion of Lignocelluloses into Ethanol . KOESNANDAR; IS HELIANTI; NIKNIK NURHAYATI
Microbiology Indonesia Vol. 2 No. 3 (2008): December 2008
Publisher : Indonesian Society for microbiology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5454/mi.2.3.1

Abstract

Ethanol has been commercially produced using sugars derived from sugarcane and corn. Recently, research has been focused on the development of thermotolerant and ethanol-tolerant yeast or bacteria that are able to produce ethanol efficiently, as well as the development of lignocellulosic materials as the carbon sources of fermentation. Utilization of lignocellulosic materials as fermentation substrate is promising since they are available in large amounts, renewable and relatively cheap. A lignocellulose biomass is a complex mixture of carbohydrate polymers. In order to develop an efficient process, there have been many attempts to obtain more efficient ways in the conversion of lignocelluloses to ethanol, including pretreatment, enzymatic hydrolysis of lignocelluloses and direct co-culture fermentation. This paper describes the production process of ethanol from starch-containing material, recent developments on the enzymatic bioconversion of lignocelluloses into sugars and their subsequent fermentation into ethanol and the possible recombination of microbes for the direct conversion of lignocelluloses into ethanol.
Prospective Use of 1-Aminocyclopropane-1-Carboxylate Deaminase-Producing Bacteria for Plant Growth Promotion and Defense against Biotic and Abiotic Stresses in Peat-Soil-Agriculture EDI HUSEN; ARIS TRI WAHYUDI; ANTONIUS SUWANTO; RASTI SARASWATI
Microbiology Indonesia Vol. 2 No. 3 (2008): December 2008
Publisher : Indonesian Society for microbiology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (77.904 KB) | DOI: 10.5454/mi.2.3.2

Abstract

The 1-aminocyclopropane-1-carboxylate (ACC) deaminase (EC4.1.99.4) is an enzyme produced by some soil bacteria to degrade ACC (the immediate precursor of ethylene) to reduce ethylene biosynthesis in higher plants. Increased concentrations of ethylene in plant tissues, which are triggered by various biotic and abiotic stresses, inhibits plant growth and weakens the plant defense against the stressors. Various findings on the successful use of ACC deaminase producing bacteria for plant growth under unfavorable soil conditions are inspiring their use in tropical peat-soil-agriculture, which possesses bio-physical constraints. It has been proven that inoculation of plants with ACC deaminase producing bacteria decreased ethylene inhibition generated by unfavorable environmental conditions, such as nutrient shortage, flooding, drought, high salts, and the presence of heavy metals and organic pollutants. Understanding the mechanisms by which ACC deaminase-producing bacteria act to reduce plant stress and the fitness of bacterial traits with the properties and constraints of peat-soils becomes a key to utilize these bacteria in improving crop productivity. The bacteria may ameliorate plant stress as well as promote plant growth under seasonal bio-physical changes of peat-soils that are usually encountered in the field.
Analysis of Pink Pigmented Facultative Methylotroph Bacteria from Human Environments DIANA ELIZABETH WATURANGI; ANDREAS KUSUMA
Microbiology Indonesia Vol. 2 No. 3 (2008): December 2008
Publisher : Indonesian Society for microbiology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (91.205 KB) | DOI: 10.5454/mi.2.3.3

Abstract

The formation of pink biofilm in wet places are usually correlated with chlorine-resistant pink pigmented facultative methylotrophs (PPFM). In this study we investigated the presence of PPFM bacteria through bacterial isolation and detection of mxaF gene from wet places of human-made environments. A total of eighteen PPFM bacterial isolates were recovered from the formation of biofilm bacterial of four test places such as washstands, bathrooms, and potable water supplies. Confirmation of the isolates through biochemical analysis were done using catalase, oxidase and urease tests. Chlorine-resistance-activity was assayed for all of the isolates. Antibiotic resistance were examined for ampicillin (25 μg), tetracycline (30 μg), kanamycin (30 μg), trimethoprim (1.25 μg), and streptomycin (10 μg) using the agar diffusion method. Genomic DNA was subjected to PCR analysis with primers corresponding to the 5’- and 3’- end conserved segments of the mxaF gene. PCR amplification followed by DNA sequencing of 16S rRNA gene were done for some isolates. We recovered 18 isolates of PPFM bacteria. Biochemical analysis indicated that the isolates were positive for catalase, oxidase, and urease activities. Chlorine-resistance-analysis showed the majority of the isolates were resistant to chlorine. Antibiotic resistance assays showed all of the isolates exhibited resistance to trimethoprim but were sensitive to streptomycin, kanamycin, and tetracycline but were variably resistant to ampicilin. PCR detection using specific primers for the mxaF gene gave a positive result for all of the isolates. DNA sequencing of the 16S rRNA gene of two isolates showed that isolate WD10 had a 98% similarity with the mxaF gene from Methylobacterium lusitanum strain MP2 and isolate WK2 had a 98% similarity to the mxaF gene from Afipia felis strain RD1. The formation of pink biofilm of four wet areas in this study were correlated with the presence of chlorine-resistant PPFM bacteria and we confirmed with the presence of the mxaF gene in all of the isolates. This finding needs to be widely publicized since some PPFM bacteria were known as opportunistic pathogens.
Characteristics of Phosphate-Solubilizing Bacteria Isolated from Acid Soil of Cikopomayak, West Java, Indonesia HAPPY WIDIASTUTI
Microbiology Indonesia Vol. 2 No. 3 (2008): December 2008
Publisher : Indonesian Society for microbiology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (80.704 KB) | DOI: 10.5454/mi.2.3.4

Abstract

Phosphate-solubilizing bacteria were isolated from acid soil from Cikopomayak. Microbiological assay showed that the bacteria were Gram negative, rod-shaped, and lacked red pigment on Pikovskaya medium. Isolate A synthesized red pigment on nutrient agar medium, while isolate B formed slightly red pigment on nutrient agar medium as well as on Voges Proskauer medium. The ratio of clearing zone to colony for isolate A and B were approximately 2.1 and 1.9, respectively. Biochemical assays showed that both isolates A and B utilized glucose, lactose, sucrose, mannitol, glycerol, mannose, urea, indole, and produced catalase, but neither produced amylase and oxidase. The bacteria are identified as Serratia marcescens. The ability to solubilize phosphate decreased or was even lost when subcultured on nutrient agar medium. However, the ability to solubilize phosphate was recovered gradually with the addition of phosphate. The results presented here suggest that the ability to solubilize phosphate and to synthesize the red pigment may be inversely correlated.
Biosynthesis of Polyamide 4, a Biobased and Biodegradable Polymer IWAN SASKIAWAN
Microbiology Indonesia Vol. 2 No. 3 (2008): December 2008
Publisher : Indonesian Society for microbiology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (208.291 KB) | DOI: 10.5454/mi.2.3.5

Abstract

Polyamide 4, which is composed of repeating unit of g-aminobutyric acid (GABA), is a biobased and biodegradable polymer since it can be synthesized from renewable material instead of fossil-based material. GABA is produced by decarboxylation of glutamate (Glu) using glutamate decarboxylase (GAD: EC 4.1.1.15), which is produced by some microorganisms. In this study, enzymatic conversion of GABA from glutamate by Lactococcus lactis and Escherichia coli cell and chemical polymerization of GABA to polyamide 4 were revealed. The results show that GAD activity of E. coli was higher than that of L. lactis. The treatment of E. coli cell by heating and sonication increased the GAD activity and conversion rate of glutamate to GABA was up to 70.5%. The optimum temperature for this conversion is 37ºC. On the other hand, chemical synthesis of polyamide 4 was catalyzed by heating GABA at 215ºC for 2 minutes
Stability of Two Probiotics Bacteria of Goat Milk Yoghurt in Rat Digestive Tract RARAH RATIH ADJIE MAHESWARI; I KOMANG GEDE WIRYAWAN; GINA LESMANA MADUNINGSIH
Microbiology Indonesia Vol. 2 No. 3 (2008): December 2008
Publisher : Indonesian Society for microbiology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (96.271 KB) | DOI: 10.5454/mi.2.3.6

Abstract

Increased age will affect the bacterial population of the human digestive tract, in which many bacteria will adapt and colonize different sites. Combining probiotics and prebiotics in what has been called a synbiotic could beneficially affect the host by improving survival and implantation/adhesion of live microbial dietary supplements in the gastrointestinal flora. Probiotic bacteria are expected to survive in the digestive tract to give health effects to the host by balancing the intestinal microflora. The addition of fructo-oligosaccharides is expected to increase viability and growth of probiotics in the digestive tract. The objective of the current research is to investigate the effect of probiotic yoghurt and synbiotic yoghurt of Etawa Breed Cross Saanen (PESA) goats together with fructo-oligosaccharides, on female rats and to study the stability of probiotic bacteria in the digestive tracts. The results showed that synbiotic yoghurt intake had no significant influence (p>0.05) on ration consumption, body weight gain, feed conversion, final body weight and mortality. The synbiotic intake significantly increased the population of Bifidobacterium longum (p
Free-Living Ice-Nucleating Active Bacteria from High Mountain Lake Habitats MUNTI YUHANA; KURT HANSELMANN
Microbiology Indonesia Vol. 2 No. 3 (2008): December 2008
Publisher : Indonesian Society for microbiology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (130.444 KB) | DOI: 10.5454/mi.2.3.7

Abstract

We collected the culturable heterotrophic bacteria from oligotrophic high mountain lake habitats and tested their capability to induce ice formation. Direct plating was carried out using low-nutrient medium at a temperature of between 3 and 4°C. As many as 84 isolates were recovered from glacial ice and natural biofilm growing on granite rocks surface. Six out of 84 isolates were capable of expressing the ice-nucleation phenotype. After autoclaving the cell suspension at 121°C for 15 min, isolate J78 was still able to retain the ability for ice formation. Heat-stable ice nuclei produced by ice-nucleating active bacteria have potential applications in biotechnology. Characterization of INA bacteria was performed employing live-dead Gram staining and molecular methods. Universal primers for Bacteria (S-D-Bact-0008-b-S-20 and S-D-Bact-1524-a-A-18) were used for PCR to amplify almost the full length of the 16S rRNA genes of selected INA isolates. Restriction fragment length polymorphism analysis resulted in 2 unique patterns, as represented by J43 and J83, respectively. Based on DNA sequencing of 16S rRNA gene, isolate J43 (GeneBank accession no. AJ864852) was closely related to Pseudomonas mephitica (99.2% sequence similarity) and Janthinobacterium lividum (99% similarity), whereas isolate J83 (GeneBank accession no. AJ864859) showed 100% sequence identity to Pseudomonas fluorescens.
Phylogenetic Evidence that Two Submerged-Habitat Fungal Species, Speiropsis pedatospora and Xylomyces chlamydosporus, Belong to the Order Jahnulales Insertae Sedis Dothideomycetes RIRY PRIHATINI; NATTAWUT BOONYUEN; SOMSAK SIVICHAI
Microbiology Indonesia Vol. 2 No. 3 (2008): December 2008
Publisher : Indonesian Society for microbiology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (646.45 KB) | DOI: 10.5454/mi.2.3.8

Abstract

The genera Speiropsis and Xylomyces are anomorph fungi. The taxonomic address for the fungi has been unclear. In this study, observation of morphological traits indicates that they have a unique pattern of mycelia with dark-brown to black colour and thick-walled hyphae. The same culture patterns of certain fungi isolated from freshwater habitats in Thailand were selected from BIOTEC Culture Collection (BCC, Thailand), while more species were added from Centraalbureau voor Schimmelcultures (CBS, Netherlands). These fungi were composed of Jahnula spp. (2-celled ascospores), Brachiosphaera tropicalis (hyaline and 4-5 armed conidia), S. pedatospora (hyaline and branches conidia) and Xylomyces sp. (dematiaceous and fusiform chlamydospores). This study was undertaken to confirm the taxonomic address for S. pedatospora and Xylomyces based on phylogenetics relationships as inferred from their ITS rDNA sequence data by using MP (unweighted and successive weighted MP), NJ, ML and Bayesian analysis. Phylogenic analysis revealed that isolates of S. pedatospora (2 strains) was a member of the Order Jahnulales and clustered with Jahnula spp. (5 strains) and B. tropicalis (4 strains) with >82% bootstrap support and 100% posterior probabilities. Four isolates of X. chlamydosporus, X. elegans and X. aquaticus were shown to be polyphyletic within the Jahnulales and Pleoporales. The MP and NJ showed the same topology as in the Jahnulales clade obtained by ML analysis.

Page 26 of 40 | Total Record : 398

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