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WHITE OYSTER MUSHROOM (p leurotus F lorida ) MUTANT WITH ALTERED ANTIOXIDANT CONTENTS
IRA DJAJANEGARA,HARSOYO
BIOTROPIA : the Southeast Asian Journal of Tropical Biology , 2008,
Abstract: Radiation using gamma ray (60Co) at 0.75 KGray with dose velocity of 1.149 KGray/hour on white oyster mushroom ( Pleurotus florida) mycelia yielded several mutants. Based on isozyme analysis using two enzyme markers such as esterase (EST) and acid phosphatase (ACP) showed that 3 putative mutants (PO-3, PO-4 and PO-5) among 5 mutants are positive. Even though the isozyme patterns indicated that those 3 putative mutants are positively mutated, only PO-5 showed higher productivity compared to control (PO-K) which is reflected by significantly higher number of fruit bodies, higher fresh weight and dry weight yield of three successive flush periods. It was assumed that the mutation which occurred in PO-3 and PO-4 may affect other trait(s) of the white oyster mushroom. Antioxidant analysis of those mutants indicate that mutant PO-4 has significantly higher antioxidant content compared to control (PO-K) and the two other mutants (PO-3 & PO-5). This finding leads to the possible applica -tion of white oyster mushroom as a natural antioxidant source.
Internet Congestion Control System
Pranoto Hidaya Rusmin,Hendrawan,Agung Harsoyo,Carmadi Machbub
Makara Seri Teknologi , 2008,
Abstract: Internet Congestion Control System. Internet congestion occurs when resource demands exceeds the network capacity. But, it is not the only reason. Congestion can happen on some users because some others user has higher sending rate. Then some users with lower sending rate will experience congestion. This partial congestion is caused by inexactly feedback. At this moment congestion are solved by the involvement of two controlling mechanisms. These mechanisms are flow/congestion control in the TCP source and Active Queue Management (AQM) in the router. AQM will provide feedback to the source a kind of indication for the occurrence of the congestion in the router, whereas the source will adapt the sending rate appropriate with the feedback. These mechanisms are not enough to solve internet congestion problem completely. Therefore, this paper will explain internet congestion causes, weakness, and congestion control technique that researchers have been developed. To describe congestion system mechanisms and responses, the system will be simulated by Matlab.
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