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All Journal Jurnal Ilmu dan Teknologi Kelautan Tropis Jurnal Akuatika BIOEDUSCIENCE Tropical Animal Science Journal Jurnal Kebijakan Perikanan Indonesia Pharmacoscript Makara Journal of Science Menawan : Jurnal Riset dan Publikasi Ilmu Ekonomi International Journal of Educational Evaluation and Policy Analysis
Yasman Yasman
Department Of Biology, Faculty Of Mathematics And Natural Sciences, Universitas Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Library & Information Science Mathematics Medicine & Pharmacology Public Health Social Sciences

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Journal : Makara Journal of Science

 1 
OBSERVATION ON THE FEEDING OF NUDIBRANCH Phyllidia varicosa LAMARCK, 1801 ON THE SPONGE Axinyssa cf. aculeata WILSON, 1925 IN CORAL REEFS OF PRAMUKA ISLAND, THOUSAND ISLANDS NATIONAL PARK, INDONESIA Yasman, Yasman
Makara Journal of Science Vol. 7, No. 1
Publisher : UI Scholars Hub

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Abstract

During three months period observations (November 16 to January 13, 2001) in coral reefs of Pramuka Island Indonesia, the nudibranch Phyllidia varicosa was observed while feeding on the sponge Axinyssa cf. aculeata. During feeding, P. varicosa extended externally the pharyngeal bulb onto the sponge causing visible somatic damage. The behaviors of contracting the body and retracting the rhinopores inside the rhinotube were also observed while feeding. Observations on the feeding of Phyllidia varicosa on the sponge Axinyssa cf. aculeata and the presence of a visible somatic damage on the prey due to predation are reported for the first time.
Effectiveness of Powder and Solid Ragi Starter on Production of Bioethanol from Rice Straw Hydrolyzate Ediviani, Wanda; Octavia, Silvi; Yasman, Yasman
Makara Journal of Science Vol. 8, No. 1
Publisher : UI Scholars Hub

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Rice straw is one of the most abundant forms of agricultural wastes in Indonesia. Rice straw contains polysaccharide in the form of cellulose and hemicellulose, which can be used as raw materials in the production of bioethanol. This study aims to examine the effectiveness of bioethanol production from rice straw’s hydrolyzate. Research was carried out by fermenting the sample using two types of starters (Baker's yeast, known as powder starter (F); and Tapai’s starter, known as solid starter (S) with a control of pure yeast, Saccharomyces cerevisiae. Glucose levels were measured using a glucometer, and bioethanol levels were analyzed using high-performance liquid chromatography (HPLC). In this study, split plot design was used as a data analyzer with two treatment factors: starter’s inoculum (R) and time of fermentation (T). This study shows that there is no significant difference between the starters’ levels of bioethanol production. However, S’s treatment produced higher levels (5,1 g/L) of bioethanol compared to F’s (4,8 g/L); the rate of bioethanol production in S’s treatment is also higher (1,3 g/L.h) than that in F’s (1,2 g/L.h). This study concludes that Tapai’s starter is more effective in producing bioethanol from rice straw’s hydrolyzate.
Effectiveness of Powder and Solid Ragi Starter on Production of Bioethanol from Rice Straw Hydrolyzate Ediviani, Wanda; Octavia, Silvi; Yasman, Yasman
Makara Journal of Science Vol. 18, No. 1
Publisher : UI Scholars Hub

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Abstract

Rice straw is one of the most abundant forms of agricultural wastes in Indonesia. Rice straw contains polysaccharide in the form of cellulose and hemicellulose, which can be used as raw materials in the production of bioethanol. This study aims to examine the effectiveness of bioethanol production from rice straw’s hydrolyzate. Research was carried out by fermenting the sample using two types of starters (Baker's yeast, known as powder starter (F); and Tapai’s starter, known as solid starter (S) with a control of pure yeast, Saccharomyces cerevisiae. Glucose levels were measured using a glucometer, and bioethanol levels were analyzed using high-performance liquid chromatography (HPLC). In this study, split plot design was used as a data analyzer with two treatment factors: starter’s inoculum (R) and time of fermentation (T). This study shows that there is no significant difference between the starters’ levels of bioethanol production. However, S’s treatment produced higher levels (5,1 g/L) of bioethanol compared to F’s (4,8 g/L); the rate of bioethanol production in S’s treatment is also higher (1,3 g/L.h) than that in F’s (1,2 g/L.h). This study concludes that Tapai’s starter is more effective in producing bioethanol from rice straw’s hydrolyzate.
Co-Authors A. Sofyan A. Sofyan Abinawanto Abinawanto Aini, Fadita Nurul Arum Albuntana Cham, Mbara Ediviani, Wanda Fachrul Razi H. Julendra Handayani, Windri Hernuryadin, Yayan L. Istiqomah Laksmana, Bayu Arif Pasa Limgiani Limgiani M. F. Karimy M. F. Karimy Maryenti, Tety Munawarohthus, Sholikha Nisa, Upi Chairun Nissa, Maftucha Octavia, Silvi Riani Widiarti Rika, Amelia Syafriana, Vilya Windri, Handayani Wisnu Wardhana