Search results for "Vivo"
showing 10 items of 1905 documents
Ex-Vivo model for the evaluation of drugs and micellar systems permeation across cornea
Synthesis and Antiproliferative Activity of 2,5-bis(3′-Indolyl)pyrroles, Analogues of the Marine Alkaloid Nortopsentin
2013
2,5-bis(3′-Indolyl)pyrroles, analogues of the marine alkaloid nortopsentin, were conveniently prepared through a three step procedure in good overall yields. Derivatives 1a and 1b exhibited concentration-dependent antitumor activity towards a panel of 42 human tumor cell lines with mean IC50 values of 1.54 μM and 0.67 μM, respectively. Investigating human tumor xenografts in an ex-vivo clonogenic assay revealed selective antitumor activity, whereas sensitive tumor models were scattered among various tumor histotypes.
Is clinical experience important for obtaining the primary stability of dental implants with aggressive threads? An ex vivo study
2018
GECKILI, ONUR/0000-0002-7852-3915; dayan, suleyman cagatay/0000-0003-3081-9618; Bilhan, Hakan/0000-0003-1787-3003 WOS:000460131200015 PubMed ID: 30818319 Background: The aim of this study was to investigate the clinicians' experience on maintaining the primary stability of implants with aggressive threads belonging to a novel dental implant system. Material and Methods: Three hundred implants with aggressive threads were inserted in fresh bovine ribs mimicking Type IV bone by five clinicians which were classified according to their previous experience of total number of implant insertion. An independent examiner measured the primary stability of all implants after insertion by using resonan…
Chronic neural probe for simultaneous recording of single-unit, multi-unit, and local field potential activity from multiple brain sites
2017
Drug resistant focal epilepsy can be treated by resecting the epileptic focus requiring a precise focus localisation using stereoelectroencephalography (SEEG) probes. As commercial SEEG probes offer only a limited spatial resolution, probes of higher channel count and design freedom enabling the incorporation of macro and microelectrodes would help increasing spatial resolution and thus open new perspectives for investigating mechanisms underlying focal epilepsy and its treatment. This work describes a new fabrication process for SEEG probes with materials and dimensions similar to clinical probes enabling recording single neuron activity at high spatial resolution.Polyimide is used as a bi…
Determination of the Subcellular Origin of [14C] Acetylcholine (ACh) and [3H] Acetylpyrrolidinecholine (Apych) Released from Guinea-Pig Cerebral Cort…
1978
After in vivo application of radiolabelled choline, radioactive ACh is formed and can be released from the brain by electrical stimulation. However, its origin is still obscure because, due to the metabolical heterogeneity of synaptic vesicles, no subcellular compartment has been found with a specific activity (SA) corresponding to that of released transmitter. To bypass this heterogeneity problem, two different labelled precursors can be used.
Biomaterial-Assisted Anastomotic Healing: Serosal Adhesion of Pectin Films
2021
Anastomotic leakage is a frequent complication of intestinal surgery and a major source of surgical morbidity. The timing of anastomotic failures suggests that leaks are the result of inadequate mechanical support during the vulnerable phase of wound healing. To identify a biomaterial with physical and mechanical properties appropriate for assisted anastomotic healing, we studied the adhesive properties of the plant-derived structural heteropolysaccharide called pectin. Specifically, we examined high methoxyl citrus pectin films at water contents between 17–24% for their adhesivity to ex vivo porcine small bowel serosa. In assays of tensile adhesion strength, pectin demonstrated significant…
Effect of cytochrome P450 inhibitors (diethyl dithiocarbamate, ketoconazole and grapefruit juice) on the pharmacokinetics of all-trans-retinoic acid.
2004
Diethyl dithiocarbamate (DEDTC) has been reported to be a more powerful inhibitor of all-trans-retinoic acid (ATRA) in vitro metabolism than the well-established cytochrome P450 (CYP) inhibitor ketoconazole (KC). In recent years grapefruit juice (GJ) has been shown to be able to increase the oral bioavailability of several drugs by inhibiting intestinal CYP. This study investigated the in vivo effect of these CYP inhibitors on the pharmacokinetics of ATRA. The latter was administered to rats as a constant-rate intravenous (i.v.) infusion (0.48 mg h(-1) kg(-1)) during 10 h and orally (1.6 mg kg(-1)). DEDTC (320 mg kg(-1) x 2 i.v., 6.4 and 32 mg kg(-1) per os (p.o.)) did not change the ATRA c…
Using exomarkers to assess mitochondrial reactive species in vivo
2014
Background:\ud The ability to measure the concentrations of small damaging and signalling molecules such as reactive oxygen species (ROS) in vivo is essential to understanding their biological roles. While a range of methods can be applied to in vitro systems, measuring the levels and relative changes in reactive species in vivo is challenging.\ud \ud Scope of review:\ud One approach towards achieving this goal is the use of exomarkers. In this, exogenous probe compounds are administered to the intact organism and are then transformed by the reactive molecules in vivo to produce a diagnostic exomarker. The exomarker and the precursor probe can be analysed ex vivo to infer the identity and a…
Uz hialuronskābes bāzes veidotu funkcionalizētu biomateriālu efektivitātes un drošības izvērtējums in vivo diabēta brūču modelī
2016
Hronisko brūču dzīšana ir viena no aktuālākajām tēmām medicīnas nozarē, un tādēļ ir nepieciešams izstrādāt jaunus materiālus un aktīvās vielas, kuri būtu efektīvāki un ātrāki hronisko brūču aprūpes risinājumos. Maģistra darbā tika izvērtēti jaunizveidotie biomateriāli, kas ietver glikoproteīnu, efektivitāte brūču dzīšanas procesos Wistar žurku tēviņiem un veikti akūtas toksicitātes noteikšanas pētījumi ICR peļu tēviņiem. Iegūtie rezultāti diabētisko brūču dzīšanas procesā parāda, ka jau sākot ar pētījuma otro dienu, salīdzinot ar kontroles grupu, diviem jaunizveidotiem biomateriāliem ir progresīva un efektīva diabētisko brūču dzīšana. Dabīgais immunomodulators uzrādīja drošus rezultātus aku…
Uz hialuronskābes bāzes veidotu funkcionalizētu biomateriālu efektivitātes un drošības izvērtējums in vivo brūču modelī
2015
Joprojām ir aktuāla dzīšanu stimulējošu, jaunu funkcionālu biomateriālu izveide, lai nodrošinātu ātrāku un efektīvāku brūču dzīšanas procesu klīnikā. Maģistra darbā tika izvērtēti jaunizveidotie biomateriāli, kas ietver glikoproteīnu, efektivitāte brūču dzīšanas procesos Wistar žurku tēviņiem un veikti akūtas toksicitātes noteikšanas pētījumi C57BL/6 līnijas peļu tēviņiem. Iegūtie rezultāti uz brūču dzīšanas procesu apstiprina jaunizveidoto biomateriālu (1 un 2) efektivitāti un progresīvu dinamiku brūču dzīšanas procesos, jau sākot ar pētījuma ceturto dienu, salīdzinot ar kontroles grupas rezultātiem. Pēc lielu devu intraperitoneālas ievadīšanas dabīgais imunomodulators uzrāda drošību akūta…