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Physiological responses of plants to arficial light
Holečková, Barbora ; Münzbergová, Zuzana (advisor) ; Konrádová, Hana (referee)
The topic of this bachelor`s thesis is the physiological response od plants to artificial lighting, meaning artificial lighting from street lamps, which is one of the important anthropogenic influences. Artificial lighting at night is referred to by the acronym ALAN (from the english phrase Artificial light at night) and can have a significant effect on plant behaviour. In this thesis, the current knowledge on the influence of streetlights on not only plant behaviour but also on entire ecosystems is summarised in the theoretical part. In the practical part, the chlorophyll content of plants is measured, which is an important parameter informing about their physiological state, i.e. whether nighttime artificial lighting has an influence on it. Subsequently, the detected chlorophyll content of plants under street lighting is compared with that of paired control plants in their surroundings that are not under any artificial lighting. The measurements are carried out using a specially designed instrument for the detection of chlorophyll content in plant leaves called CCM300. The result of the work is the understanding of the possible effect of street lighting Key words Physiological reaction, artificial light at night, plants, chlorophyll
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Influence of temperature on the diving reflex
Soustružník, Ondřej ; Vondrášek, David (advisor) ; Bažant, Filip (referee)
Title: Influence of temperature on the diving reflex Background: It is likely that the sum of the defense systems of the organism to changes in temperature known as the diving reflex occurs in each individual differently depending on the physical preparedness. Objectives: Check the effect of temperature on performance-diving reflex two different groups - experienced and novice divers. On the basis of experimental testing in hot and cold water, check the reaction of the body to different environmental conditions. Based on the physiological changes in an organism to assess whether it was demonstrated physiological ability of the body, known as the diving reflex. Methods: Experimental testing beginner diver (n = 5) experienced divers (n = 5) in hot water of temperature 20 - 25 ř C and cold water at a temperature of 4-6 ř C in the static apnea. Based on the measured values, changes in the body, heart rate, oxygen saturation, the overriding influence of sympathetic and parasympathetic, concentration and relaxation index to assess the extent of reaction of the organism and the subsequent involvement of the defense systems of the organism, as called diving reflex. To assess the difference between groups were used statistical methods - Cohen da Kolmogorov-Smirnův test. Results: The results of experiments...
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