• Title/Summary/Keyword: biological

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Biological Hydrogen Production Processes (생물학적 수소생산 공정)

  • Shin, Jong-Hwan;Park, Tai Hyun
    • Korean Chemical Engineering Research
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    • v.44 no.1
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    • pp.16-22
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    • 2006

  • Biological hydrogen production processes are more environment-friendly and less energy intensive than thermochemical and electrochemical processes. The biological process can be divided into two categories: photosynthetic hydrogen production and hydrogen production by dark fermentation. Photosynthetic process produces hydrogen mainly from water and reduces $CO_2$ simultaneously. Dark fermentation is a dark and anaerobic process that produces hydrogen by fermentative bacteria from organic carbon. The article presents a survey of biological hydrogen production processes.

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A Study on the Quantitative Regularity Measures That Are Suitable for Biological Signal Analysis - Standard Data and 24 Hour R-R interval Analysis

  • Nam, Y.H.;Lee, J.M.;Han, J.M.;Park, K.S.
    • Proceedings of the KOSOMBE Conference
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    • v.1998 no.11
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    • pp.197-198
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    • 1998

  • We tested the capability of Pointwise Correlation Dimension(PD2), Approximate Entropy (ApEn) and LZ complexity, as alternative measures of a biological signal. For this purpose, we analyzed standard data and a healthy child's 24-hour heart rate variability. Our conclusion is as follows. First, PD2, ApEn and LZ complexity can be used for discerning chaotic attractor, white noise, and periodic signal. Second, these measures show different characteristics on day and night. Third, these measures can be used for detecting time-varying characteristics of biological signals.

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Detection of cry-type Genes of Bacillus thuringiensis Isolates from Korea (한국에서 분리한 Bacillus thuringiensis 균주의 cry형 유전자의 동정)

  • Park Sooil;Lee Kwang Yong;Kang Eun Young;Kim Eui Na;Kwon Hyuk Han;Ahn Seong Kyu;Lee Hyung Hoan
    • Microbiology and Biotechnology Letters
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    • v.33 no.2
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    • pp.154-158
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    • 2005

  • Twenty-three Bacillus thuringiensis strains isolated from Korea were screened to detect the cry-type genes using PCR with 21 specific oligonucleotide primers. Eight strains contained distinct multiple crystal genes; cry1Aa2, cry1Ab1, cry1Ac1 and cry2Aa1. These results indicate that the strains coincided with the B. thuringiensis subsp. kurstaki strain. The other 15 strains were not recognised to the 21 specific primers.

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