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Ways of signal transmission and physiological role of electrical potentials in plants

100%
Dziubinska H.
Acta Societatis Botanicorum Poloniae
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2003
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tom 72
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nr 4
Plants are subject to stimuli from the environment on which they strongly depend and in contrast to animals, they are unable to escape harmful influences. Therefore, being able to receive stimuli they have developed adequate responses to them. Such a reaction can occur in the area of a stimulus action or cover the whole plant or its parts. In the latter case, it is a systemic reaction. The plant reaction is expressed by various intensity, rate and kind of response. It is interesting to know the character of the signal informing about a stimulus, the routes of its propagation and the transmission mechanism. Three conceptions of excitation are distinguished: 1) propagation of chemical agents formed at the site of a stimulus action with the flow of the phloem sap or through the atmosphere (in the case of volatile substances) to other plant parts, 2) a very fast transmission by the xylem in the wave of hydraulic pressure formed after a plant damage. From combining the "hydraulic" and "chemical" hypothesis a conception of hydraulic dispersion has been formulated which assumes that chemical substances synthetized after an injury can be transferred very fast with the wave of hydraulic pressure changes in the whole plant, 3) a stimulus evokes the action potential (AP), and its transmission along the whole plant, plant organ or specialized tissue, by local circuits from cell to cell. Strong, damaging stimuli can evoke variation potentials (VPs), the character of which differs from APs. It is postulated that transmission of VP occurs by a hydraulic dispersion and electrical changes seem to be secondary phenomena.
2
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Simulation of the power unit of the automatic electrohydraulic drive with volume regulation

84%
Sokolov V., Azarenko N., Sokolova Y.
Teka Komisji Motoryzacji i Energetyki Rolnictwa
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2012
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tom 12
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nr 4
3
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Effect of farnesol and its synthetic derivatives on the settling behaviour of the peach potato aphid Myzus persicae (Sulz.)

67%
Dancewicz K., Gliszczynska A., Halarewicz A., Wawrzenczyk C., Gabrys B.
Pestycydy
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2010
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nr 1-4
The behavioural effect of trans,trans-farnesol and its structural derivatives on M. persicae was evaluated. The incorporation of carboxy group into the molecule did not alter the strong deterrent activity of farnesol. The lactonization and the epoxidation of farnesol caused the delay in expression and the loss of deterrent activity, respectively. The ester, product of Claissen rearrangement of farnesol and iodolactone did not exhibit significant biological effect.
4

Signal transmission via G protein-coupled receptors in the light of rhodopsin structure determination

67%
Ciarkowski J., Drabik P., Gieldon A., Kazmierkiewicz R., Slusarz R.
Acta Biochimica Polonica
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2001
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tom 48
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nr 4
G protein-coupled receptors (GPCRs) transducing diverse external signals to cells via activation of heterotrimeric GTP-binding (G) proteins, estimated to mediate ac­tions of 60% of drugs, had been resistant to structure determination until summer 2000. The first atomic-resolution experimental structure of a GPCR, that of dark (in­active) rhodopsin, thus provides a trustworthy 3D prototype for antagonist-bound forms of this huge family of proteins. In this work, our former theoretical GPCR mod­els are evaluated against the new experimental template. Subsequently, a working hy­pothesis regarding the signal transduction mechanism by GPCRs is presented.
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