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Roni Ridwan
Research Center for Biotechnology, Indonesian Institute of Sciences (LIPI)

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In Vitro Ruminal Fermentation and Degradability of Rice Husk on Rice Bran Substitution Rusli Fidriyanto; Roni Ridwan; Wulansih Dwi Astuti; Rohmatussolihat Rohmatussolihat; Nurul Fitri Sar; Muh Watman; Yantyati Widyastuti
Annales Bogorienses Vol. 24 No. 1 (2020): Annales Bogorienses
Publisher : National Research and Innovation Agency (BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/ann.bogor.2020.v24.n1.50-58

Abstract

Rice bran is a by-product of the rice milling process and has been well used as livestock feed. Rice bran is often adulterated with rice husk. The objective of this study was to evaluate the in vitro ruminal fermentation characteristics of rice bran with various compositions of rice husk and assess the relationship between rice husk addition and rice bran quality. The experiment was arranged in a completely randomized design with rice husk addition as a factor and three replications. Data of proximate value, gas production, ruminal degradability, and volatile fatty acid production were analyzed by analysis of variance. Moreover, significant effects of each treatment in the in vitro fermentation were further analyzed by Duncan's multiple range test (P<0.05). It was shown that the addition of rice husk to rice bran could increase acetic acid level, but it reduced potential gas production, gas production rate, organic matter and dry matter digestibility, and propionic acid level. Interestingly, the linear regression of dry matter digestibility, organic matter digestibility, and potential gas production showed the high adjusted R2 values. Moreover, this study also revealed that 10% of rice husk substitution on rice bran could significantly reduce the dry matter digestibility.
Ecological Study of Rare-Actinomycetes in Soils and Leaf-Litters Puspita Lisdiyanti; Shanti Ratnakomala; Roni Ridwan; Yantyati Widyastuti; Misa Otoguro; Katsuhiko Ando
Annales Bogorienses Vol. 15 No. 2 (2011): Annales Bogorienses
Publisher : National Research and Innovation Agency (BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/ann.bogor.2011.v15.n2.31-36

Abstract

A total of 268 strains of Actinomycetes were isolated from soil and leaf-litter samples collected in Jambi (Sumatera) and Cibinong (West Java) using three selective isolation methods. All the isolates were identified by morphological characteristic and by analysis of 16S rDNA sequence. On the basis of their morphology and 16S rDNA sequence, 164 isolates were belonged to the Streptomyces Group and 104 isolates were belonged to the Rare-Actinomycetes (Non-Streptomyces) Group. Furthermore, 40% of isolates in Streptomyces Group and 62% of isolates in Non-Streptomyces Group are supposed to be new taxa. It is indicated the richness of Actinomycetes in these two area. The genus Streptomyces is the most abundant in soil samples, occupying 60-75% of all isolates; while the genus Actinoplanes is mainly found in leaf-litter samples (70%). The use of selective isolation media is important to elucidate the microbial diversity.
Diversity of Actinomycetes from Soil Samples Collected from Lombok Island, Indonesia Puspita Lisdiyanti; Tomohiko Tamura; Shanti Ratnakomala; Roni Ridwan; Gina Kartina; Yulin Lestari; Katsuhiko Ando; Yantyati Widyastuti
Annales Bogorienses Vol. 16 No. 1 (2012): Annales Bogorienses
Publisher : National Research and Innovation Agency (BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/ann.bogor.2012.v16.n1.35-40

Abstract

A total of 137 strains of Actinomycetes were isolated from 14 soil samples collected in 3 part of Lombok Island, Indonesia using SDS-YE (SY) and Rehydration and Centrifugation (RC) isolation methods and Humic Acid Vitamin (HV) agar as isolation media. All the isolates were identified by morphological characteristic and by analysis of 16S rRNA gene sequence. On the basis of their morphology and 16S rRNA gene sequence, 67% of isolates were belonged to the Streptomyces Group and 33% of isolates were belonged to the Rare-Actinomycetes (Non-Streptomyces) Group. Nine families and 15 genera were found from the samples. It is indicated the richness of actinomycetes in these area. The genus Streptomyces is the most abundant in all soil samples, occupying 67% of all isolates by using SY method; while the genus Actinoplanes is mainly found by using RC as isolation method. Two strains belong to the genus Virgisporangium and Catenulispora that showed taxonomic interest need further study for describing as ne species.
Co-Authors Gina Kartina Katsuhiko Ando Misa Otoguro Muh Watman Nurul Fitri Sar Puspita Lisdiyanti Rohmatussolihat Rohmatussolihat Rusli Fidriyanto Shanti Ratnakomala Tomohiko Tamura Wulansih Dwi Astuti Yantyati Widyastuti Yulin Lestari