National Repository of Grey Literature 31 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Preparation of 64Cu and its prospective carriers for nuclear medicine.
Kozempel, Ján ; Lešetický, Ladislav (advisor) ; Kotek, Jan (referee) ; John, Jan (referee) ; Příhoda, Jiří (referee)
5 Summary The preparation of 64Cu including it's radiochemical separation and the preparation of its novel radiolabelled tracers intended for the use in nuclear medicine is described in this work. A novel method for the preparation of no carrier added 64Cu, based on the 64Zn(d,2p)64Cu reaction and consecutive dual ion exchange chromatography was developed. The radiochemical product was of high specific activity and with only 61Cu radionuiclidic impurity, which allows it's use for in vitro laboratory experiments or in vivo preclinical tests of labelled tracers. We have focused on the preparation of several 64Cu labelled tracers. Two different types - water soluble polymer carriers and hypoxia selective biacetyl bis- (N4-alkylthiosemicarbazone) complexes of 64Cu were prepared. The water soluble polymer carriers based on the copolymers of NIPAM, GM and HPMA bearing various chelating groups were prepared. The polymeric chain was modified by copolymerization of a monomer with chelating functional group or modified after polymerization. Two standard polyacidic chelators (DOTA, DTPA) as well as three non-common copper chelators (dipicolylamine, thiosemicarbazide, Ag ionophore II) were used. Their potential use in nuclear medicine for local radio- or combined ...
Study of thiol addition to biliverdine, the synthesis of labelled bilirubine
Felklová, Veronika ; Lešetický, Ladislav (advisor) ; Smrček, Stanislav (referee)
Biliverdin and bilirubin are bile pigments which are degradation products of heme. Biliverdin (BV) is greenish-blue pigment and is reduction product of tetrapyrrolic core of heme by influence of the hemoxygenase (HO). The final product of this degradation is yellowish-brown pigment bilirubin (BR) which forms from BV thanks to the biliverdinreduktase (BVR). Normal and slightly raised level of bilirubin in plasma has cytoprotective effects whereas high levels are cytotoxic often. In severe unconjugated hyperbilirubinemia cases (newborn children) unconjugated bilirubin (UCB) accumulates in central nervous system (CNS) and causes bilirubin-induced neurologic dysfunction (BIND). Unfortunately there is a limitation for finding UCB pathophysiology caused by difficult determination of UCB content and distribution in tissues and biological fluids. So the main purpose of this thesis is to find and integrate isolated methods which will serve as the basis of finding bilirubin distribution. This progress would have a significant effect on studies of bilirubin neurotoxicity on newborn children. This method is based on radioactive labeling of UCB. Preferentially atom C 10 used for binding suitable functional group (thiols) because conformation of indicated bilirubin shouldn't change in this position. And then the...
"Drug Delivery" systems for nuclear medicine
Kučka, Jan ; Lešetický, Ladislav (advisor) ; Smrček, Stanislav (referee) ; Hampl, František (referee) ; Hampl, Richard (referee)
5. SummarY in Czech (Souhrn) Podařilo se stabilně vilzat skvantitativním ýěŽkem '''At na potenciálně ořímopouŽitelnýnosič,kteýdobřeodolávásilnéradio|ysevyvolanécr- ;;il; zllAt. íIavícse poáařilo částečněozřejmit chování ,''At vůči redukčněoxidačnímp.o""'ů. a stabilizovat jej v chemické formě astatidu vhodné pro značenízvoleného systému. Byly připraveny a charalÍerizovány modelové rozpustné systémy nuuizě.,e^ pio cílenímakromo1ekul do kostní tkáně a za|oŽené na statisticlcýc.h kopolymerech N-l2-(hydroxypropyl)].methakrylamidu , Ínono,n"."* obsahujítímhydroxybisfosfonátové skupiny. Byla prokázána rychlá a účinnáadsorpce cílěnýchpolymerů na in vitro model kostní tkáně hydroxyapatit (většiná polymeru je nasorbována během 1 minuty inkubace; u ruao- piípadůbylo nasorbováno za tuto dobu přes 80 % polymeru). MnoŽstvípolymeruadsorbovanéhonahydroxyapatitjesilnězávislé |r"á"usirn na.obsahu hydroxybisfosfonáj9Úch skupin v polymeru. Byly irip.uu"ny systémy ousátru.ji modelová léčívavázaná na polyrner stabilní .u,nioi"tou, nya.oíyti"ty sicpitelnou hydrazonovou vazbou. Na pol1mer uvi" """a'*ó "n".i"té kancerostatikum (doxorubicin), radiodiagnostikum |úin)u model radioterapeutika ('25|. Byl připraven, charakterizován,.. omačen a in vivo otestován termoresponsivní systémnesoucí 1311 u 90y. Byla pozorována dobrá...
Antimycobacterial isosters of salicylanilides
Matyk, Josef ; Waisser, Karel (advisor) ; Čižmárik, Jozef (referee) ; Lešetický, Ladislav (referee)
V PhD disertaci byla popsána skupina 79 látek (4-alkylfenyl)salicylamidů, N-heteroarylsalicylamidů, 3-(4-alkylfenyl)-2H-1,3-benzoxazin-2,4(3H)-dionů, 3- (4-alkylfenyl)-2H-1,3-bemzoxazin-4(3H)thioxo-2-onů, 3-(4-alkylfenyl)-2H-1,3- benzoxazin-2,4(3H)-dithionů a 3-heteroaryl-2H-1,3-benzoxazin-2,4(3H)-dionů. Látky byly hodnoceny na antimykobakteriální, antifungální a antibakteriální aktivitu. Vybrané látky byly hodnoceny na cytotoxicitu. Deriváty (4-alkylfenyl)salicylamidů byly analyzovány přístupem QSAR (Kvantitativní vztahy mezi strukturou a aktivitou) a to metodou podle Freeho a Wilsona. Struktura připravených látek byla ověřena 1 H-NMR a IČ-spektroskopií a jejich čistota elementární analýzou. Deriváty (4-alkylfenyl)salicylamidů, N-heteroarylsalicylamidů, 3-(4- alkylfenyl)-2H-1,3-benzoxazin-2,4(3H)-dionů, 3-(4-alkylfenyl)-2H-1,3- bemzoxazin-4(3H)thioxo-2-onů, 3-(4-alkylfenyl)-2H-1,3-benzoxazin-2,4(3H)- dithionů a 3-heteroaryl-2H-1,3-benzoxazin-2,4(3H)-dionů vykazovaly vysokou aktivitu vůči Mycobacsterium tuberculosis a atypickým kmenům mykobaktérií (M. avium a M. kansdasii).

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