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Disturbance history of the primary mountain mixed forests in Temperate Zone (Europe)
Komín, Stanislav ; Janda, Pavel (advisor) ; Bače, Radek (referee)
This paper is about structure and disturbance regime of mountain mixed forests in location Šrámkova dolina, which is in Tatras national park. Except this, thesis also informs about problems which are in mountain mixed forests. Forest dynamic were monitored od 14 permanent plots, which were in the line polygon, every plot takes 1000 m2. Study is based on the structural data of the type, thicknes and age structure and this data were put into dendroecological analys, which shows releases during the growth. Based on results, we can say that most trees strarts their growth in forests gap, and most of trees did not detect release. Šrámkova dolina were formed by gew several wind disturbances, biggest impact had few disturbances between year 1834 and 1845, this event strongly affected regenerations between decades 1845 and 1885. In the Europe temperate zone are mountain forests mostly affected by wind adn bark beatle, but in mixed forests are damage caused by bark beatle smaller. Small canopy destruction caused by small disturbance salso play very important role in forests dynmic here.
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Disturbance history of the primary mountain spruce forests in Temperate Zone (Europe)
Hanousek, Jan ; Janda, Pavel (advisor) ; Čada, Vojtěch (referee)
This thesis is about the development and structure of mountain Norway spruce forest in location Koprová dolina, which is part of Tatras national park. Forest dynamic were monitored on 13 permanent research plots, every plot takes 1000 m2. Study was based on the analyses of the thicknes and age structure and the dendrochronologal analysis, which detects releases during growth. Based on results we confirmed that locations have character of natural forests, these locations are formed by strong and big-scale disturbances, but also by disturbances of medium and small strenght and scale. Results are similar with other papers and historical texts, which describes disturbances events in Koprová dolina.
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Species requirements on the structure of European mountain Norway spruce forest
Suderová, Natálie ; Čada, Vojtěch (advisor) ; Janda, Pavel (referee)
The aim of this bachelor thesis is to summarize conteporary studies about the biological and ecological characteristics and demands of the plant, animal and fungi species inhabiting montane Norway spruce forests, especially those of the red-list species.
An extensive systematic review was conducted as a part of this study, with a systematic research of Web of Science database, finding science studies containing key words referencing to high montane spruce forest and biotope demands of organisms. Out of a total 475 studies found in a Web of Science database, 57 studies were chosen with objectiv criteria, and 44 were cited in the bachelor thesis.
Bachelor thesis chapters were dedicated to functional groups of organisms, as often found in studied literature, i.e. vascular plants, fungi, lichenes and epiphytes, arthropods and nematodes, birds, mammals and amphibians.
Several structural key elements were found to be significant for the abundance, biodiversity and species composition of organisms inhabiting high montane spruce forest. These key elements are forest structure, deadwood, admixture tree species and environment pollution.
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Poly(Methylene Blue) Modified Carbon-based Electrodes for Electrochemical Detection of Hydrogen Sulfide
Zlámalová, Magda ; Janda, Pavel ; Nesměrák, K.
A comparative electrochemical study has been carried out of the electropolymerization of phenothiazine derivative, methylene blue (MB). Electrochemical properties of resulting electrocatalytically active methylene blue polymer (pMB) have been studied on three various carbon-based substrates: basal plane of highly oriented pyrolytic graphite (HOPG), pencil-graphite electrode (PGE) and carbon fibre micro electrode (CFE). Electrodes modified with the polymer (HOPG/pMB, PGE/pMB and CFE/pMB) have been prepared by potential cycling in aqueous electrolyte solution containing dissolved monomeric methylene blue. Electrocatalytic activity of three developed electrode systems towards hydrogen sulphide has been compared. Developed electrodes have been further investigated as potential sensors for sulfhydryl-containing compounds.
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Electrochemical Characterization of Poly(methylene Blue) Modified Graphite Electrodes
Zlámalová, Magda ; Janda, Pavel ; Nesměrák, K.
This work deals with electrochemical study of methylene blue (MB) polymerization as well as characterization of deposited conductive film on basal plane highly oriented pyrolytic graphite (HOPG) and pencil-graphite electrode (PGE). Poly(methylene blue) modified electrodes (HOPG/pMB and PGE/pMB) have been prepared by potential cycling in aqueous electrolyte solution containing methylene blue monomer. It has been found that electrochemical properties and electrocatalytic activity of deposited film are greatly influenced by the type of electrode substrate. Developed electrodes have been further investigated as potential sensors for sulfhydryl-containing compounds.
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Influence of Electrode Preparation on Electrocatalytic Activity of Tetrapyridinoporphyrazinato Cobalt(II) Complex to Propylene
Klusáčková, Monika ; Janda, Pavel ; Tarábková, Hana
The water-soluble complex N ,N' ,N' ',N' "-Tetramethyl-tetra-3,4-pyridinoporphyrazinocobalt (CoTmt-3,4-ppa) has been deposited by different techniques on two substrate. Electrochemical deposition, spontaneous adsorption, and spin coating have been used to the modification of two electrode material: annealed gold as hydrophilic substrate and highly oriented pyrolytic graphite as hydrophobic substrate. The modified electrodes have been characterized using cyclic voltammetry, backscattering VIS spectroscopy and atomic force microscopy. The influence of substrate material and modification techniques on electrocatalytic activity of CoTmt-3,4-ppa modified electrodes for propylene oxidation has been studied.
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Gaseous nanodomains at solid/liquid interface
Janda, Pavel ; Tarábková, Hana ; Klusáčková, Monika
Existence of gaseous nanodomains at solid liquid interface (surface nanobubbles) has been presumed first by Phil Attard and his fellow workers (1) based on discovery of long range attractive forces between two adjacent planar solid surfaces immersed in water. Attard et al. ascribed forces and their discontinuous character to sub-micro bubbles bridging both immersed surfaces.
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Electrocatalytic Oxidation of Unsaturated Hydrocarbons Mediated by Phthalocyanine Derivate
Klusáčková, Monika ; Janda, Pavel
The oxidation of ethylene and propylene respectively, mediated by thin layer -tetramethyltetra-3,4-pyridinoporphyrazinocobalt, simply called CoTmt-3,4-ppa, deposited on basal plane of highly ordered pyrolytic graphite (HOPG) was studied in aqueous phosphate buffer phosphate solution by cyclic voltammetry, backscattering spectroscopy and atomic force microscopy. Our interest has been focused on optimizing conditions of electrocatalytic oxidation unsaturated hydrocarbon on electrode modified by pyridinoporphyrazine.
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Natorp's System of the Syntetic Function of Reason and Theory of Number
Janda, Pavel ; Pavlík, Ján (advisor) ; Bartoň, Petr (referee)
Presented paper is concerned with Paul Natorp's system of the synthetic function of the reason and its influence on the theory of number. I will try to show that present system of the number theory suffers from some significant drawbacks and Natorp's theory may be able to amend them. Natorp elaborates his theory on the basis of Kantian categorical system and Kant's transcendental philosophy. In my paper, I would like to achieve two goals. Firstly, I would like to support Natorp's statement that we need to be concerned with the logical system of our concept's originating. Secondly, I will try to defend Natorp's theory against accusations of psychologism.
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Electroanalysis with phthalocyanine modified HOPG electrodes
Mansfeldová, Věra ; Janda, Pavel
In this papers we presented modification of highly oriented pyrolitic graphite (HOPG) by two different phthalocyanine (Pc) derivatives and two different deposition techniques. We have investigated electrode modified by fullerene-derived phthalocyanine and cobalt tetraneopentoxyphthalocyanine (CoTNPc) to consider how different modification procedure-electrodeposition and drop evaporation and composition of phthalocyanine influences detection of model compound, L-cysteine.
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