Search results for "Ultra"
showing 10 items of 4451 documents
Photoinduced lethal and sublethal toxicity of retene, a polycyclic aromatic hydrocarbon derived from resin acid, to coregonid larvae
2004
A comparative investigation on the acute phototoxicity of retene to vendace (Coregonus albula) and whitefish (C. lavaretus), both having pelagial larvae in spring, was conducted. To test the concept of early warning of sublethal biomarkers in relation to lethality to posthatch stages, we examined the effects of ultraviolet-B (UV-B) and retene on the levels of cytochrome P4501A (CYP1A) and heat shock protein 70 (HSP70) by exposing the animals to elevated levels of these factors for 48 and 72 h, respectively. Whereas UV-B and retene on their own were not lethal, simultaneous retene and UV-B exposure caused very high mortality to both species. The median lethal concentration (LC50; i.e., the c…
Choroidal thickness in glaucoma patients and glaucoma suspects measured by spectral domain coherence optical tomography
2012
Purpose: The aim of our study was to evaluate and compare retro-foveolar choroidal thickness (RFCT) of healthy subjects, individuals with intraocular hypertension, patients with primary open-angle glaucoma (POAG), patients with normal tension glaucoma (NTG) and patients with primary angle-closure glaucoma (PACG) by spectral domain optical coherence tomography (SD-OCT).Methods: Sixty-five healthy eyes, 30 eyes with intraocular hypertension, 90 eyes with POAG, 30 eyes with NTG and 20 eyes with PACG were included in this cross-sectional study. RFCT, foveolar retinal thickness and average retinal nerve fiber layer thickness (RNFL) were measured by SD-OCT (Spectralis HRA-OCT, Heidelberg Engineer…
Foot and Lower Limb Clinical and Structural Changes in Overuse Injured Recreational Runners Using Floating Heel Shoes: Preliminary Results of a Rando…
2021
Foot-strike and the associated load rate are factors related to overuse injuries in runners. The purpose of this study was to analyse structural and functional changes in runners using floating heel running shoes, compared with runners using conventional footwear. A randomised control trial was conducted. Twenty runners with overuse injuries were followed over a 12-week gait retraining programme using floating heel running shoes or their conventional footwear. Pain was measured with pressure pain thresholds (PPTs), structural changes were measured with ultrasonography, and severity and impact of injury was scored on the Oslo Sports Trauma Research Centre Overuse Injury Questionnaire (OSTRC-…
FORMATION OF MOLECULES IN ULTRACOLD ATOMIC GASES VIA QUASI-RESONANT FIELDS
2010
we study the nonlinear mean-field dynamics of diatomic molecule formation at coherent photo- and magneto-association of ultracold atoms focusing on the case when the system is initially in the all-atomic state. We show that in the limit of strongly nonlinear interaction between an ultra-cold atomic-molecular system and a quasi-resonant electromagnetic field, the molecule formation process, depending on the characteristics of the associating field, may evolve according two different scenarios, namely, weak- and strong-oscillatory regimes. In the first case the number of molecules increases without pronounced oscillations of atom-molecule populations, while in the second case high-amplitude R…
Ultrasound bioeffects in rats: quantification of cellular damage in the fetal liver after pulsed Doppler imaging
2011
Objective To determine whether pulsed Doppler examination of the ductus venosus in rat fetuses could damage exposed tissue. Methods On gestational day 18, the livers of a mean of approximately five fetuses per mother (n = 5.14, SD = 1.6), in a cohort of 35 pregnant female rats, were exposed individually to pulsed Doppler and these were considered the 'exposed group'. The remaining fetuses in each pregnant rat (n = 5.16, SD = 2.1) formed the 'control group'. We tested for 600, 300, 60, 20, 15, 10 and 3 s of exposure of the fetal ductus venosus and the damage was evaluated measuring a cell death index of apoptotic activity at 7 h post-exposure (n = 16). In addition, subgroups of mothers were …
Ultrametrisku galīgu automātu iespējas
2015
Maģistra darbā tiek pētīti ultrametriski galīgi automāti un to iespējas. Ultrametriski automāti ir līdzīgi varbūtiskiem automātiem, tikai varbūtību vietā tiek izmantotas amplitūdas, kas ir p-adiski skaitļi. Pēdējos divos gados tika veikti dažādi pētījumi, kuros piedalījās arī darba autors, par ultrametrisku algoritmu izmantošanas iespējām, ieskaitot to izmantošanu galīgajos automātos. Darbā tiek izpētītas dažādu ultrametrisku galīgu automātu tipu iespējas, salīdzinot tos ar citiem automātu tipiem. Maģistra darbā tiek salīdzinātas dažādi definētu ultrametrisku galīgu automātu valodu atpazīšanas iespējas. Ultrametriski galīgi automāti darbā tiek salīdzināti arī ar dažādu sarežģītību determinē…
Functional outcomes of peripheral nerve repair and regeneration: clinical and experimental study
This study investigated pre- and post-operative evaluation of peripheral nerve injuries and functional outcomes of peripheral nerve regeneration after different type of injuries and different type of treatments. Neuromas/scar neuritis and brachial plexus injuries are specifically addressed; literature and experimental evidence on the outcomes of vascularized nerve grafts are presented.
Sieviešu līdzdalība ādas vēža profilakses īstenošanā
2016
Saslimstība ar dažādām ādas vēža formām ar katru gadu pieaug. Slimība ir ārstējama un prognoze, lai atveseļoties ir laba, jo ādas vēzis ir viens no visvieglāk atklājamajiem vēža veidiem, dēļ tā, ka tas ir pamanāms, kā arī, ievērojot dažādus piesardzības pasākumus no tā ir viegli sevi pasargāt. Darba mērķis bija noskaidrot kāda ir sieviešu līdzdalība ādas vēža profilakses īstenošanā. Pētniecības uzdevumi bija: apkopot un analizēt literatūras avotus par ādas ļaundabīgiem audzējiem, to diagnostiku, ārstēšanu un profilaksi. Izmantot pētniecības darba pamatojumam Kalistas Rojas piemērošanās teoriju. Izveidot anketas jautājumus, balstoties uz pētījuma teorētisko daļu, veikt anketēšanu, apkopot ie…
Multi-Chip RFID Antenna Integrating Shape-Memory Alloys for Detection of Thermal Thresholds
2011
Low-cost wireless measurement of objects' temperature is one of the greatest expectation of radiofrequency identification technology for the so many applications in cold supply-chain control and safety assessment in general. In this context, the paper proposes a dual-chip UHF tag embedding shape memory alloys (SMA) able to transform the variation of the tagged item's temperature into a permanent change of antenna radiation features. This event-driven antenna is hence able to selectively activate the embedded microchips according to the temperature above or below a given threshold. A general design methodology for the resulting two-ports tag antenna is here introduced and then applied to pro…
A Shape-based Statistical Method to Retrieve 2D TRUS-MR Slice Correspondence for Prostate Biopsy
2012
International audience; This paper presents a method based on shape-context and statistical measures to match interventional 2D Trans Rectal Ultrasound (TRUS) slice during prostate biopsy to a 2D Magnetic Resonance (MR) slice of a pre-acquired prostate volume. Accurate biopsy tissue sampling requires translation of the MR slice information on the TRUS guided biopsy slice. However, this translation or fusion requires the knowledge of the spatial position of the TRUS slice and this is only possible with the use of an electro-magnetic (EM) tracker attached to the TRUS probe. Since, the use of EM tracker is not common in clinical practice and 3D TRUS is not used during biopsy, we propose to per…