Paper deals with the problem of detection of weak time-resolved cathodoluminescence (CL). The time-correlated single-photon counting method (TCSPC) is here presented. In comparison to usually used method of measuring of time-dependent analogue signal, TCSPC method excels in detection of weak CL, primarily fast scintillators. Comparative measurement of time-resolved CL intensity with use of both methods is also included in this paper. and Článek se zabývá detekcí slabé časově rozlišené katodoluminiscence (CL). Je zde představena metoda časově korelovaného čítání jednotlivých fotonů (TCSPC), která, na rozdíl od běžně používané metody měření časové závislosti analogového signálu, vyniká v detekci slabé CL především rychlých scintilátorů. V článku je rovněž obsaženo srovnávací měření časově rozlišené intenzity CL s využitím obou metod.
Metoda fázově modulační časově rozlišené konfokální mikrospektrofluorimetrie byla využita v kombinaci s fluorescenčním zobrazováním k monitorování transportu fluorescenčně značeného terapeutického oligonukleotidu do buněk za pomoci kationického porfyrinu. Bylo možné sledovat stabilitu vytvořeného transportního komplexu ve vnitrobuněčném prostředí a interakci transportovaného oligonukleotidu s cílovými molekulárními strukturami v buněčném jádře., Time-resolved phase modulation microspectrofluorimetry in combination with fluorescence microscopy imaging have been applied to monitor the cellular uptake fluorescent-labeled therapeutic oligonucleotide delivered by a cationic porphyrin. Transport complex stability inside the cell and the oligonucleotide interaction with the target molecular structures in the cell nucleus has been monitored., Petr Praus, Eva Kočišová, Josef Štěpánek, Peter Mojzeš., and Obsahuje bibliografii
Jeden z hlavních výzkumných směrů Ústavu technické a experimentální fyziky ČVUT v Praze je zaměřen na částicovou fyziku. Předmětem činnosti pracovníků ÚTEF je fyzika top kvarku studovaná v rámci experimentu ATLAS na nově budovaném urychlovači LHC v CERN, fenomenologie srážek hadronů a atomových jader, vlastnosti málonukleových systémů a výpočty jaderných maticových elementů dvojitého rozpadu beta., Karel Smolek., and Obsahuje seznam literatury
The latest research reveals that nitric oxide as a gas messenger may diffuse into the surrounding extracellular fluid and act locally upon neighboring target cells. However, several observations raise the possibility that nitric oxide may also be released at a greater distance from the neuronal cell body. The catalytic nitric oxide synthase (cNOS) activity was therefore studied in the cervicothoracic and lumbosacral segments of the spinal cord of rabbits, including the white matter of dorsal columns (DC), lateral columns (LC) and ventral columns (VC), as well as the gray matter of dorsal horns (DH), intermediate zone (IZ) and ventral horns (VH). Lower cNOS activity was found in the white matter of both cervicothoracic (47 %) and lumbosacral (30 %) regions, whereas that detected in the gray matter of the lumbosacral part of the spinal cord was considerably higher (70 %). Enzyme activity varied from 43.4 to 77.2 dpm/µg protein in the cervicothoracic segments of the gray matter in the descending order: DH>VH>IZ. Similar cNOS activity was found in the white matter of the cervicothoracic segments (42.1-62.8 dpm/µg protein). When the activity of cNOS was compared in the lumbosacral segments, the highest enzyme activity was found in DH of the gray matter (198.7 dpm/µg protein) and the lowest cNOS in DC (45.8 dpm/µg protein) of the white matter. It was concluded that the white matter of the spinal cord contains similar cNOS activity in comparison to the gray matter., N. Lukáčová, J. Pavel., and Obsahuje bibliografii
Non-surgical management of aortic valve disease has been given considerable attention. Several recent publications have already reported its use in clinical practice. The main issue is to get an understanding of the pathophysiological processes and, most importantly, extensive experimental activity. In addition to testing various animal models, technical and material aspects are also being intensively investigated. It is not clear yet whether the durability and applicability of this promising development will be comparable with the standard of current cardiac surgery. Nonetheless, even the use of some models as a temporary approach helping to improve the circulatory status, not allowing safe surgery, is certainly justified. At any rate, a new stage of research and clinical application has been set off. However, experimental background continues to be simply indispensable. The paper is a short review of the issue., J. Šochman, J. H. Peregrin., and Obsahuje bibliografii a bibliografické odkazy
The development of the cauda equina syndrome in the dog and the involvement of spinal nitric oxide synthase immunoreactivity (NOS-IR) and catalytic nitric oxide synthase (cNOS) activity were studied in a pain model caused by multiple cauda equina constrictions. Increased NOS-IR was found two days post-constriction in neurons of the deep dorsal horn and in large, mostly bipolar neurons located in the internal basal nucleus of Cajal seen along the medial border of the dorsal horn. Concomitantly, NOS-IR was detected in small neurons close to the medioventral border of the ventral horn. High NOS-IR appeared in a dense sacral vascular body close to the Lissauer tract in S1-S3 segments. Somatic and fiber-like NOS-IR appeared at five days post-constriction in the Lissauer tract and in the lateral and medial collateral pathways arising from the Lissauer tract. Both pathways were accompanied by a dense punctate NOS immunopositive staining. Simultaneously, the internal basal nucleus of Cajal and neuropil of this nucleus exhibited high NOS-IR. A significant decrease in the number of small NOS immunoreactive somata was noted in laminae I-II of L6-S2 segments at five days post-constriction while, at the same time, the number of NOS immunoreactive neurons located in laminae VIII and IX was significantly increased. Moreover, high immunopositivity in the sacral vascular body persisted along with a highly expressed NOS-IR staining of vessels supplying the dorsal sacral gray commissure and dorsal horn in S1-S3 segments. cNOS activity, based on a radioassay of compartmentalized gray and white matter regions of lower lumbar segments and non-compartmentalized gray and white matter of S1-S3 segments, proved to be highly variable for both post-constriction periods., J. Maršala, J. Kafka, N. Lukáčová, D. Čížková, M. Maršala, N. Katsube., and Obsahuje bibliografii
Alena Bičáková, Guido Matias Cortes, Jacopo Mazza., Částečně tištěno napříč, Obsahuje bibliografii a bibliografické odkazy, and České a anglické resumé