National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Deriving predictive pathophysiological markers from ICP analysis
Mládek, Arnošt ; Bradáč, Ondřej (advisor) ; Haninec, Pavel (referee) ; Mraček, Jan (referee)
Deriving predictive pathophysiological markers from ICP analysis RNDr. Arnošt Mládek, Ph.D. December 13, 2021 Abstract Intracranial pressure (ICP) is an irreplaceable neurointensive care parameter and is an area under intensive research. The great diagnostic importance of ICP is underlied by two factors: (1) the central nervous system (CNS) is placed in a rigid cranial vault and even small local expansive processes (e.g. tumors, abscesses, bleeding) may lead to intracranial hypertension; (2) a specific property of the CNS is a rather uniform response to various pathological events since many etiologically heterogeneous diffuse injuries of neural tissue lead to oedema elevating ICP. The complexity of ICP monitoring stems from the neurosurgical insertion of the pressure sensor into the intracranial space and the associated risks of bleeding, neuroinfection and brain tissue damage. Intracranial pressure is more than just a number on a bedside monitor, even though in clinical practice this simplification is rather common. Similarly to electrocardiogram (ECG) signals whose information content goes well beyond heart rate calculation, understanding of ICP dynamics can provide us with insight into the current clinical status as well as prediction of further evolution. The mainstay of the dissertation thesis are...
Computational Study of the TiO2-Catalyzed Synthesis of Acyclonucleosides from Formamide: Implications for the Origin of Life
Mládek, Arnošt ; Burda, Jaroslav (advisor) ; Futera, Zdeněk (referee)
The TiO2-catalyzed synthesis of nucleosides in non-aqueous formamide environ- ment via so-called acyclonucleoside intermediates represents an alternative way for the emergence of nucleic acids monomeric units, which could address the the fundamental problem associated with the formation of a --glycosidic bond between a nucleobase and a sugar moiety. In this computational contribution we present a plausible reaction route for the prebiotic TiO2-catalyzed synthesis of purine C2- and C3-acyclonucleosides in formamide, which does not require photocatalytic or radical chain mechanisms. The maximum computed activation energy along the proposed reaction channel is ≥ 32 kcal·mol≠1 , which is clearly feasible under the experimental conditions of the Saladino synthesis. We show that the rate determining step of the entire reaction path is the deprotonation of the formaldehyde hydrate methylene carbon occurring likely on defective binding sites of an anatase surface. Our calculations thus support the view of Saladino et al. about the catalytic role of the TiO2 surface in the one-pot synthesis of purine acyclonucleosides in heat formamide solution.

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