Effect of three Zn2+ concentrations, i.e. 0.075 (cl), 7.50 (c2) and 37.5 (c3) jiM, on rice seedlings was studied at three stages, i.e. 1, 14 and 21 d after transplantation. Typical deficiency symptoms were observed in both solution and sand cultures of cl and c2, but the effects were more pronounced in the solution culture. The c3 concentration was toxic. There was marked reduction in growth, chlorophyll (Chl) contents (particularly Chl b), Hill reaction activity, photophosphorylation rate (particularly non-cyclic photophosphorylation), thylakoid phosphorylation, and i'‘C02-fixation at the cl concentration. However, a similar reduction was also observed in thylakoid phosphorylation at the c3 concentration. Hence the optimum zinc concentration in the nutrient medium lied between c2 and c3 Zn2+. By regression the theoretical optimum Zn concentration was calculated as 19.20 pM (1.28 mg kg'i) Zn2+. Partitioning of ^'^C-photosynthates indicated reduced allocation to sugar and starch fractions and increased fřee amino acids concentration at the cl concentration and vice-versa at c2 and c3.
The paper argues in favour of the Searlean internalist way of construing the content of thoughts and communicative acts. As interpreted by the author, it reflects the participation of external factors in the determination of content (stressed by externalists like Burge, Putnam, Kripke and Davidson) but it does so in a way which enables to approach the thinking and communicating individual as a real subject of his acts. The crucial move is to incorporate the individual’s reliance on the relevant parameters of his physical or social environment into the construal of the content itself. Then the external factors can be treated as exploited by the individual himself in the articulation of his acts, rather than as intervening into the content through the gaps marked by indexicals, proper names, natural kind terms or concepts borrowed from the communal repertoire. In particular with respect to the last factor the author proposes a maxim of interpretation which he labels as The principle of maximization of subjectivity and regards as a pendant of the well-known Principle of charity., Příspěvek argumentuje ve prospěch Searleanova internacionalistického způsobu interpretace obsahu myšlenek a komunikačních aktů. Jak interpretuje autor, odráží účast externích faktorů na určování obsahu (zdůrazněno externisty jako Burge, Putnam, Kripke a Davidson), ale dělá to způsobem, který umožňuje přistupovat k myšlení a komunikovat jednotlivce jako skutečný jeho aktů. Rozhodujícím krokem je začlenit závislost jednotlivce na relevantních parametrech jeho fyzického nebo sociálního prostředí do konstrukčního obsahu samotného. Externí faktory pak mohou být považovány za vykořisťované jednotlivcem samotným v artikulaci jeho činů, spíše než jako zasahování do obsahu skrze mezery označené rejstříky, vlastními jmény, termíny přirozené povahy nebo koncepty vypůjčené ze společného repertoáru. Zejména s ohledem na poslední faktor autor navrhuje zásadu interpretace, kterou označuje jako zásadu maximalizace subjektivity a vnímá jako přívěsek známého principu lásky., and Petr Koťátko