National Repository of Grey Literature 422 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Hosts and transmission of the crayfish plague pathogen Aphanomyces astaci
Svoboda, Jiří
The crayfish plague pathogen, the oomycete Aphanomyces astaci, has been decimating populations of European crayfish species for more than 150 years, and is therefore considered one of the 100 worst world's invasive species. A. astaci is highly specialised for a parasitic life, but it can be isolated from moribund crayfish and grown on synthetic media, as it is the case also for several other oomycetes (chapter 7). The life of A. astaci includes three basic forms: mycelium in host's tissues, and the infective units occurring in water, zoospores and cysts. All North American crayfish species tested so far have shown some resistance to A. astaci, i.e., they could carry the infection for long, serving as vectors of the pathogen. Massive sporulation from infected North American crayfish starts when the host is moulting, stressed, or dying (chapter 4). However, I could show in my experiments that some sporulation occurs even from apparently healthy and non-moulting American crayfish hosting A. astaci, so infected North American crayfish must be considered a permanent source of the infection (chapter 4). Five genotype groups of A. astaci have already been distinguished. Strains from a particular genotype group probably share the same original host crayfish species of North American origin. Nevertheless, they can...
Problems of lower palaeolithic small sized industries in Central Europe
Levínský, Ondřej ; Svoboda, Jiří (referee) ; Kaminská, Lubomíra (referee)
Recent research of Lower Palaeolitic has brought new knowledge that changes in many way previously held views of this period. The development of human culture followed complex paths that reflect the adptation of Man to the natural conditions of the Middle Pleistocene. The existence of complexes of small sized tools, which appeared and existed alongside the Acheulian culture, can be regarded as one such adaptation. From the point of view of the raw materials and mode appearing not a case of a predominantely pebble industry. Various raw material modes were used in production which were deliberately chosen in direct association with the type of artefact which is required. From the point of view of size this type industries are small sized. Subject of this paper is detail typological and morphological evaluation of this type industries in Central Europe with analogical newly discovered and investigated localities in Bohemia (Slaný II, Tmaň, Velké Přítočno, Kročehlavy, Karlštejn-Altán, Horky II).
Men and caves in the Neolithic Period
Peša, Vladimír ; Popelka, Miroslav (advisor) ; Svoboda, Jiří (referee) ; Pavlů, Ivan (referee)
Men and Caves in the Neolithic Period Vladimír Peša ABSTRACT From the beginning of archaeological excavations in the 19th century up to the present day, caves as archaeological sites have most often been interpreted as longer- or shorter-term settlements, hideaways or shelters for herdsmen; other interpretations that are considered for caves are cult functions and shelters for social outcasts. I see the beginnings of these notions of universal functions for caves in two contexts. Up until the second half of the 20th century there was a predominant interest throughout most of Europe in Palaeolithic history, and an interpretive model of Palaeolithic cave settlement was subsequently applied to frequently less distinct or even different find situations dating to post-Mesolithic periods. Secondly, at the close of the 19th century caves in the general consciousness of society (i.e. including archaeological) were mainly thought of as warfare shelters or as cover from inclement weather during agricultural activities away from the settlement. Speculation on the greater importance of cult activities and the symbolism of caves doesn't appear with greater regularity in literature until the 1980s; and yet, the settlement impression of caves persists. Using the Neolithic period as an example, the submitted work attempts...
Selection of Constitutional Justices in Czechia and Slovakia
Svoboda, Jiří ; Hřebejk, Jiří (referee)
Thesis focuses on institutional aspect of selection of constitutional judges in Czechia and in Slovakia, personal aspect of selection, i.e. identification of the groups of recruitment and requirements and qualities of the judges. Thesis also focuses on the process, i.e. procedural aspects within which the key authorities (presidents and parliaments) compare and choose individual candidates. Based on this analysis the student will identify strengths and weaknesses of both systems, which could lead to paralysis of court in question.
Potential of Historical Water Management Objects in Tourism
Havlíček, M. ; Svoboda, J. ; Skokanová, H. ; Dzuráková, M. ; Pavelková, R. ; Vyskočil, Aleš
Historic water management facilities may have various uses in the field of tourism. Some water management facilities can be adapted for purposes of board and/or lodging of visitors, which is a common alternative use of former water mills, sawmills or hammermills (workshops for processing of iron by mechanical hammer). A smaller part of water management facilities serves within tourism as attractive goals for visitors, e.g. expositions in old water mills, hammermills, paper mills, sawmills, stamping mills, hydroelectric power plants, waterworks facilities. In addition to the above examples, the preserved water management structures can also become attractive if they become part of hiking and biking trails. These include aqueducts, remains of navigation canals, old wells, preserved and extinct old weirs and dikes. Some water management objects have cultural and historical significance and are protected as cultural monuments. An evaluation of the potential of historic water management facilities in all aspects of tourism was performed in selected river basins in the Czech Republic.
Study of structural features of single stranded DNA by biophysical techniques and crystallography
Svoboda, Jakub ; Schneider, Bohdan (advisor) ; Pavlíček, Jiří (referee)
DNA is the fundamental molecule in all domains of life, its role in heredity is well established. Although the famous double helical complementary form is indispensable for replication mechanism DNA can occupy wide range of conformations. In the past studies performed in the laboratory, DNA oligomers related to single stranded bacterial Repetitive Extragenic Palindromic (REP) showed spectral behavior suggesting complex equilibria including double helical, hairpin, and tetraplex conformations. The studies presented in this thesis extended the scope of analyzed sequences and employed circular dichroism spectroscopy and X-ray crystallography. We report spectral data and X-ray structures of three successfully crystalized oligonucleotides. All three structures acquire double helical architecture with two consecutive T- T mismatches in the center. To improve the convergence of the refinement process of the crystal structures we used novel dinucleotide conformational classes, NtC classes. The NtC class classification was also used to analyze geometries of selected non-canonical base pairs in all DNA crystal structures in the Protein Data Bank. We measured the fit between geometries of the dinucleotides involved in the non-canonical base pairing and the NtC classes and correlated this fit to the electron...
The observations of gamma ray sources and calibration of the Cherenkov Telescope Array Observatory
Juryšek, Jakub ; Prouza, Michael (advisor) ; Moderski, Rafal (referee) ; Svoboda, Jiří (referee)
In this thesis, we present the Monte Carlo study of two prototypes of tele- scopes for the Cherenkov Telescope Array (CTA) observatory, followed by the first data analysis partially using our reconstruction pipeline based on Random Forests. The Monte Carlo model of the SST-1M prototype is created and val- idated by comparison with data. Using the precise Monte Carlo models, we evaluate the performance of the SST-1M and LST-1 prototypes, working so-far in mono-regime as standalone telescopes, resulting in their energy and angular resolution, and the differential sensitivity. We also present an analysis of the data from the first two Crab Nebula observation campaigns conducted with the LST-1 telescope. In the last part of the thesis, we present a study of aerosol optical depth of the atmosphere above both future sites of the CTA observa- tory, retrieved from photometric measurements of Sun/Moon photometers. We focus on the photometer in-situ calibration for nocturnal measurements and introduce corrections to minimize systematic shifts between diurnal and noc- turnal measurements. Using the developed methods, we present the aerosol characterization of both CTA sites based on the photometric data. 1

National Repository of Grey Literature : 422 records found   1 - 10nextend  jump to record:
See also: similar author names
30 SVOBODA, Jakub
58 SVOBODA, Jiří
30 Svoboda, Jakub
75 Svoboda, Jan
2 Svoboda, Jan,
38 Svoboda, Jaroslav
1 Svoboda, Jindřich
58 Svoboda, Jiří
2 Svoboda, Jonáš
12 Svoboda, Josef
1 Svoboda, Jáchym
Interested in being notified about new results for this query?
Subscribe to the RSS feed.