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INDONESIA
BERITA BIOLOGI
Published by Lembaga Ilmu Pengetahuan Indonesia
ISSN : -     EISSN : -     DOI : -
Core Subject : Science, Agriculture,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology
Arjuna Subject : -
Articles 32 Documents
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Search results for , issue "Vol 10, No 3 (2010)" : 32 Documents clear
OPTIMASI DAN KARAKTERISASI a-AMILASE DARI ISOLAT AKTINOMISETES YANG BERASAL DARI KALIMANTAN TIMUR Yati Sudaryati Soeka
BERITA BIOLOGI Vol 10, No 3 (2010)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/beritabiologi.v10i3.751

Abstract

Forty-one actinomycetes isolates from East Kalimantan held in Microbiology Division Collection-UPI, and their ability to produce a-amylase has been assessed. Those 41 number of actinomycetes isolates performed amylolytic activity as shown by clear zone areal after being poured with iodium solution. The bacteria produced high a-amylase when was grown in media containing starch soluble 2% the a-amylase activity in media containing 8.24 U/ml. The isolate (number 7) was the most active compared to another (number 100) and it was identified as Nocardia; the activity of this enzyme obtained was 12.93 U/ml (one unit activity is defined as mol of glucose produced per ml per minute). The maximum temperature for enzyme reaction was 40°C, optimum pH was pH 7.5 the a-amylase activity were 15.76 U/ml and 31.11 U/ml, respectively. From kinetic characterization study, it was found that enzyme showed Km and Vmax value of 7.62 % (b/v) and 71.10- umol/ml/minute respectively at condition of temperature 40°C, pH 7.5 and incubation time 10 minute.
PENENTUAN STATUS MUTU AIR DENGAN METODE STORET DIDANAU SENTANI JAYAPURA PROPINSI PAPUA Auldry F Walukow
BERITA BIOLOGI Vol 10, No 3 (2010)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/beritabiologi.v10i3.742

Abstract

The problem in Lake Sentani area are degradation of watershead and land forest convertion, which cause decreasing water quality in Sentani Lake. For this reason, it is very important to analyze of water quality status in L. Sentani periodically in order to retain its sustainability. The analyzed result by using STORET method showed the quality statue of L.Sentani are ranged from moderate to heavy pollution in category since 2006.

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