Utilization of potatoes in the tropics

Meeting: International Society for Tropical Root Crops Symposium, 4th, 1-7 Aug. 1976, Cali, COIn IDL-133

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Not AvailableThis paper explores the extraction and detection processes of quorum sensing molecules such as N aceyl homoserine lactone compounds (AHL) from marine Vibrio harveyi. The spent culture of V. harveyi was solvent partitioned for AHL, rotary evaporated and re-suspended in 50% acetonitrile then detected with reporter strain using Luminometer. Furanone was tested for antagonism against V. harveyi and an inhibitory zone of 9.0 ± 0.25 mm was observed. When, V. harveyi grew in Lysogeny broth (LB) with furanone, the growth was decreased from 0.2 to 0.03 optical density (OD) in 16 h. In control, V. harveyi growth was increased from 1.33 to 2.3 OD. When furanone was challenged against V. harveyi among shrimp post larvae, the cumulative percentage mortality was increased in the control from 0.85 to and 80% for the period of 5th to 30th days. But in the treatment tank the mortality varied from 0.53 to 1.26, 5.51, 8.17, 10.72 and 13.37% till the 30th day. The differences in the cumulative percentage mortalities in the treatment tank were 0.32, 2.34, 28.63, 51.50, 59.20 and 66.71% respectively as compared to the control. The results suggest that furanone can be used as non-antibiotic agent to control shrimp disease caused by V. harveyiNot Availabl

Quantum Biological Switch Based on Superradiance Transitions

A linear chain of connected sites with two asymmetric sinks, one attached to each end, is used as a simple model of quantum (excitonic and/or electron) transport in photosynthetic bio-c omplexes. For a symmetric initial population in the middle of the chain, it is expected that transport is mainly directed towards the strongly coupled sink. However, we show that quantum effects radically change this intuitive ``classical'' mechanism, so that transport can occur through the weakly coupled sink with maximal efficiency. Using this capability, we show how to design a quantum switch that can transfer energy or charge to the strongly or weakly coupled branch of the chain, by changing the coupling to the sinks. The operational principles of this quantum device can be understood in terms of superradiance tra nsitions and subradiant states. This switching, being a pure quantum effect, can be used as a witness of wave--like behaviour in molecular chains. When realistic data are used for the photosystem II reaction center, this quantum biological switch is shown to retain its reliability, even at room temperature.A linear chain of connected sites with two asymmetric sinks, one attached to each end, is used as a simple model of quantum (excitonic and/or electron) transport in photosynthetic biocomplexes. For a symmetric initial population in the middle of the chain, it is expected that transport is mainly directed toward the strongly coupled sink. However, we show that quantum effects radically change this intuitive "classical" mechanism so that transport can occur through the weakly coupled sink with maximal efficiency. Using this capability, we show how to design a quantum switch that can transfer energy or charge to the strongly or weakly coupled branch of the chain, by changing the coupling to the sinks. The operational principles of this quantum device can be understood in terms of superradiance transitions and subradiant states. This switching, being a pure quantum effect, can be used as a witness of wavelike behavior in molecular chains. When realistic data are used for the photosystem II reaction center, this quantum biological switch is shown to retain its reliability, even at room temperature