Pigments absorbing 350-1,050 nm radiation have had an important role on the Earth for at least 3.5 billion years. The ion pumping rhodopsins absorb blue and green photons using retinal and pump ions across cell membranes. Bacteriochlorophylls (BChl), absorbing in the violet/blue and near infra red (NIR), power anoxygenic photosynthesis, with one photoreaction centre; and chlorophylls (Chl), absorbing in the violet/blue and red (occasionally NIR) power oxygenic photosynthesis, with two photoreaction centres. The accessory (bacterio)chlorophylls add to the spectral range (bandwidth) of photon absorption, e.g., in algae living at depth in clear oceanic water and in algae and photosynthetic (PS) bacteria in microbial mats. Organism size, via the package effect, determines the photon absorption benefit of the costs of synthesis of the pigment-protein complexes. There are unresolved issues as to the evolution of Chls vs. BChls and the role of violet/blue and NIR radiation in PS bacteria., A. W. D. Larkum, R. J. Ritchie, J. A. Raven., and Obsahuje bibliografické odkazy
When in vitro growth of Vittaforma comeae was tested using MDCK, MRC-5, XEN, L-929 and FHM cell lines, propagation occurred only in MDCK, MRC-5 and XEN cells. The intervals required for the various stages of the life cycle to develop were the same in all the cell lines tested. The MDCK cell line was selected to support the growth of V. comeae in vitro and provide the system for in vitro testing of drugs. The weekly output of V. comeae spores from the MDCK cell monolayer was monitored over a 61-week period during which there were fluctuations but no definite increase or decrease in output. Albendazole at 2.1 or 4.2 pg/ml in MEM was tested against V. comeae in MDCK cell monolayers and showed antimicrosporidial activity. The percentage of infected cells was reduced in the presence of the drug and there were ultrastmctural abnormalities in all stages of the life cycle. The drug prevents parasite division.
Tato studie se zaměřuje na výzkumné otázky vztahující se k regionálnímu rozměru komunikace vědy v Praze, jejím dopadům a vhodným nástrojům. Pro vypracování studie byly použity analýza dokumentů a dotazník distribuovaný vybraným expertům. Výsledky naznačují, že regionální rozměr komunikační politiky a iniciativ pro vědu (SCIP) je v Praze relevatní. Avšak pozornost věnovaná této otázce národními a regionálními úřady je nedostatečná a vede k nedostatečné koordinaci mezi zainteresovanými aktéry. Dopady SCIP spočívají v povzbuzovaní zájmu mladých lidí o vědu, zvyšování obeznámenosti široké veřejnosti s otázkami vztahujícími se ke vědě a ve vysvětlování role vědy ve společnosti a problémů, jimž jako sektor čelí. Aby byly dopady komunikace vědy maximalizovány, národní a regionální ofciální místa by měla sehrát integrační roli. Vzhledem ke koncentraci aktérů SCIP by město Praha mělo aspirovat na rozvinutí vlastní politiky komunikace vědy., Regional aspects of science communication represent a potential asset and as such are quite suitable topic for further examination with respect to future social and economic development in Prague based on the city's main development strategies. Closer analysis of SCIP aspects at re-gional level can present a suitable complement for development of suitable measures and projects of the regional innovation and education policies. This study focuses on research questions related to regional dimension of science communication, its impacts and suitable tools. Document analysis and questionnaire distributed among selected experts were chosen as tools for elaboration of the study. Results suggest that regional dimension of science communication policy and initiatives (SCIP) is a relevant one in case of Prague. However, the attention given to this topic by national and regional authorities is unsatisfactory resulting in lack of co-ordination of activities of the respective stakeholders. Impacts of SCIP, as far as causality can be identified, lie in encouraging young people in their interest in science, increasing awareness of general public in science-related issues and explaining role of science in society and problems that science (as a sector) is facing. To maximise effects of science communication there is a space for national and regional authorities to play an integrating role. Given the concentration of SCIP actors, the City of Prague could aspire to develop its science communication policy in order to promote itself as a Central European centre of science., and Adolf Filáček, Jakub Pechlát.
This paper shows how the local effects can change the value of maximum accelerations from mining-induced tremors. The analysis was carried out basing on data collected from acceleration stations installed in Bytom Syncline region (Upper Silesia). The estimation of the local effects was obtained on the basis of deviations from the attenuation relation. The accelerograms were recorded from the mining tremors in low seismic energy range and in epicentral distances in the range from 500m to 5000m. The obtained re sults were correlated with results from Horiz ontal to Vertical Spectral Ratio (HVSR) technique. This method is based on simple theoretical founda tion and is commonly used in natural seismicity studies. Our results show that the H/V ratio technique gives a reasonable estimate of the surface amplification for frequency range between about 2 and 8 Hz. In case of simple geology and when the signal to noise is adequately high the results are the best. All the results show that there occur local effects., Adam Fref and Wacław Marian Zuberek., and Obsahuje bibliografické odkazy
The aim of the study is to identify the recent local geodynamic processes on the territory of the Dniester PSPP (Ukraine), which arose as a result of the additional man-caused load during the construction of hydro-technical structures. The research is based on the results of 17 cycles of periodic static GNSS campaigns conducted during 2004-2017. In this work the vectors of horizontal displacement of the reference GNSS network points of Dniester PSPP are determined and their scheme is constructed. On the basis of average vectors of horizontal movement velocities during 2004-2017, the value of the velocities of dilatation - the parameter of Earth surface deformation which characterises the relative area expansion or compression, is calculated. As a result of the analysis of velocity distribution of the dilatation of Dniester PSPP territory, the areas of extreme values of compression and stretching are revealed, which testify to the increased geodynamic activity of the pivot part, as well as the main structures of the construction. and Savchyn Ihor, Vaskovets Serhii.
This paper presents examples of application of the method of local quasigeoid modelling based on the geophysical technique of gravity data inversion, using non-reduced surface gravity data and GNSS/levelling height anomalies. Its capacity is demonstrated with three examples consisting in computing detailed local quasigeoid models for three areas situated in Poland. The test areas are different in size (3,900, 23,000, 117,000 sq. kilometres), in geographic location as well as in density of the gravity data coverage. For each of the test regions, calculations were done in three variants, viz. without using any global geopotential model and with application of EGM96 and EGM08 models. The obtained results indicate that the applied method is suitable for creating high accuracy local quasigeoid models (the accuracies obtained were at the level of accuracy of GNSS/levelling test data)., Marek Trojanowicz., and Obsahuje bibliografii
The paper presents analysis relating to the method of local quasigeoid modelling based on the geophysical technique of gravity data inversion, using non-reduced surface gravity data and GNSS/levelling height anomalies. One of the main problems occurring in the application of the method is to determine the model weighting matrix, the purpose of which is to control the inversion process. This paper presents the analyses concerning the determination of certain constant coefficients signed as, and, appearing in the definition of the model weighting matrix. The calculations performed indicate that because of the accuracy of the density model, the coefficient should be in the range of 01. 0 001. 0, and the range 005.00025.0 should be adopted as the optimal. As the optimal values of the coefficients and, values 1.0 and 01.0, for the zones of constant density with area less than about 130 km2 were determined., Marek Trojanowicz., and Obsahuje bibliografické odkazy