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3. Biological Activity of the Endolichenic Trichoderma spp. Isolated from Lichens Cryptothecia spp. and Dirinaria spp.

Author

Phu, N. T., Cam, V. T. M., Minh, N. T. N., Tuoi, V. T. H., Khanh, N. Q., Son, L. T., Giang, T. T., and Lien, N. T.

Subjects
TRICHODERMA, TRICHODERMA harzianum, LICHENS, LACCASE, BIOLOGICAL pest control agents, RALSTONIA solanacearum, COLLETOTRICHUM
Abstract

Endolichenic fungi are considered a promising source of new materials. For further evaluation of some biological activities of the Trichoderma strains isolated from lichens Dirinaria spp. and Cryptothecia spp., their antifungal and antibacterial activities were screened by the methods of dual culture and environmental toxicity. Substrate degradation was evaluated using the qualitative enzyme assays. Fourteen strains of Trichoderma spp. were isolated from 60 lichen samples. All the isolates were able to inhibit the radial growth of tested fungal strains (Bipolaris spp., Colletotrichum spp., Corynespora cassiicola, and Fusarium spp.). Otherwise, only 12/14 isolates were found capable of competing for substrates with Ralstonia solanacearum. The cell-free supernatant obtained from the cultures possessed both antifungal and antibacterial activities. The antagonistic activity of the isolates was selective. Most of the isolates were able to degrade at least one of the investigated substrates, namely cellulose, pectin, and starch. All strains could produce peroxidase; none of the isolates possessed laccase and tyrosinase. A potential antagonistic fungal strain VDT6 has been identified as Trichoderma harzianum. The assessment results indicated that the Trichoderma isolates could be used in agriculture as biological control agents. [ABSTRACT FROM AUTHOR]

Published
2023
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5. Communicating Cooperative Robots with Bluetooth

Author

Henrik Schiøler, Son, L. T., Ole Brun Madsen, and Jens Frederik Dalsgaard Nielsen

Abstract

A generic architecture for system of cooperating communicating mobile robots is presented. An overall structure is defined from a modularity viewpoint, where a number of generic modules are identified; low level communication interface, network layer services such as initial and adaptive network structuring, routing and capacity management, overall behaviour which includes commitment to overall strategies as well as local behaviour like trajectory planning and navigation. Focus is kept on communication aspects and an example application of establishing a reliable wireless real-time communication backbone is presented. Initial and online adaptive network structuring strategies are discussed viewed from efficiency and robustness properties as well as their projection onto the Bluetooth protocol. Ad-hoc routing algorithms are evaluated w.r.t. feasibility in a quasi stationary network structure under varying traffic demands. A novel capacity based on-demand routing algorithm is deviced to achieve general Quality of Service provision in an ad-hoc Bluetooth scatternet. A novel paradigm of coordinated behaviour for providing network connectivity under mobility is presented.

Published
2001

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