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National Repository of Grey Literature

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Semiconductor microstructures for cellular photostimulation Tvrdoňová, Anna ; Weiter, Martin (referee) ; Glowacki, Eric Daniel (advisor) Peroxid vodíku (H2O2) je metastabilní reaktivní forma kyslíku, která reguluje mnoho biologických drah. Úloha H2O2 v biologických procesech závisí na jeho lokální koncentraci, v malém množství (nM) může působit jako signální molekula, zatímco vyšší koncentrace mohou mít cytotoxické účinky. Cílem této práce bylo vytvoření fotosenzitivních mikročástic, které by produkovaly fyziologické množství peroxidu vodíku pro regulaci signálních drah v kultivovaných buňkách. Navrhované mikročástice jsou organické fotovoltaické struktury bez substrátu, které produkují H2O2 fotofaradickou redukcí molekulárního kyslíku. Produkce peroxidu probíhá za současné oxidace donoru elektronů přítomného v elektrolytu. Částice mají rozměry v řádu mikrometrů, zatímco jejich tloušťka nepřekračuje 100 nm. Fotofaradické reakce jsou poháněny červeným světlem (660 nm), které může pronikat tkáněmi, což umožňuje potenciální aplikace mikročástic in vivo. Práce se bude zabývat optimalizací výroby mikročástic a charakterizací produkce H2O2. Detailed record

Optimalization of photostimulation technology for delay sexual maturity of brook trout (Salvenilus fontinalis) JUNG, Jakub The aim of the present work, based on two experiments, was to evaluate the impact of photostimulation as a prevention for delaying the sexual maturation of brook trout (Salvenilus fontinalis). Another additional experiment was to describe which effect has photostimulation on the consequences of aggressive behaviour of males. Two experimental groups were established and differed in illumination sources: the metal halide lamps (HAL) and the light emitting diodes (LED). The photostimulation timing (photoperiod) was tested in following experiment. In both tested groups (HAL and LED) the photoperiod was prolonged to 18L:6D in comparison to the control group with natural photoperiod. The results shows that before spawning females and males in both tested groups (HAL and LED) reached significantly higher body weight up to 100 g (=0.05) due to desirable delayed sexual maturation (up to one month). By obtaining the same results in both groups, clearly profitable source of illumination was LED and the time for sufficient application before spawning was 67 days. Moreover photostimulation had also positively reflected in the elimination of aggressive behaviour of males. The results of the present study suggest that photostimulation may be applicable in the intensive culture systems of salmonids in the Czech Republic. Detailed record

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