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Abstract

The thermoluminescence characteristics of functionally intact thylakoids and TRIS-washed BBY particles werestudied under Cu(II) poisoned conditions. In thylakoids, both the A and B thermoluminescence bands correspondingto S3QA− and S2S3QB− charge recombinations, respectively showed specific responses to Cu(II) treatment. The amplitude of the B band was gradually decreased, which corresponds to the Cu(II) induced inactivation ofTyrZ. The simultaneous stepwise shift in the peak position of the B band indicated, however, that S3QB− chargere combination is more resistant to Cu(II) poisoned conditions. The shifted peak position of the A band toward thehigher temperature in Cu(II) treated thylakoids also showed a change in the redox span between the recombination partners generating the A band of the glow curve. The AT band due to the HisCQA− recombination in TRISwashedBBY particles was insensitive to Cu(II) addition indicating that Cu(II) did not affect either HisC or QA−. The unaffected intensity of the A and AT bands when Cu(II) inhibits TyrZ function favours the assumption of an alternative pathway in which functional TyrZ is not required. In addition, Cu-induced changes of the TL bands were compared to those produced by the Tyr and His modifiers NBD and DEPC, respectively.We obtained very similar results regarding TL bands by either adding NBD or Cu-poisoning in functional thylakoids. Regarding DEPC, the A and AT bands were abolished by increasing concentrations of the His modifier. This effect was associated with the decrease of the B band and its replacement by the Q band at around 0 ºC. Comparing our data obtained by Cu, NBD and DEPC treatments, we have found a strong interrelation between HisC and S3 state. We assume that in some inhibitory conditions in the S3 state His is oxidized in place of Mn and this alternative pathway does not require functional TyrZ.Abbreviations: DCMU-3-(3,4-dichlorophenyl)-1,1-dimethylurea; DEPC-diethyl pirocarbonate; NBD-7-chloro-4-nitrobenz-2-oxa-1,3-diazole; PS II -Photosytem II; QA and QB -the primary and secondary quinine acceptors of PS II; TL -thermoluminescence; TyrZ -tyrosine species acting as a donor to P680.

A „Sárga zongoraszoba”. Rippl-Rónai zenei festészete

“…101 Anella emlékei szerint Novák gyakran és több éven át a Róma-villa vendége volt, kinek zongorajátékát délutánonként, sőt sokszor még vacsora után is örömmel hallgatták a villa lakói. 102 Rippl-Rónai örömmel újságolta Ödönnek, hogy Novákra milyen nagy hatást tett Fenella zongorajátéka, a lány művészi érzékére vonatkozó elismerés nyilván jól esett az őt felfedező és támogató mesternek. 103 Fenella, akit orvosa gyenge fizikuma miatt eltanácsolt a zongorázástól, otthon gyakran csillogtatta meg zongoratudását legkedveltebb komponistái, Schumann, Chopin és Liszt művein keresztül.…”