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Davor Kubalek, Gregor Serša, Marko Štrok, Ljudmila Benedik, Zvonka Jeran
Tobacco and tobacco smoke are very complex mixtures. In addition to various chemical and organic compounds they also contain natural radioactive elements (radionuclides). In this work, the natural radionuclide activity concentrations ((234)U, (238)U, (228)Th, (230)Th, (232)Th, (226)Ra, (210)Pb and (210)Po) of nine different cigarette samples available on the Slovenian market are reported. In addition to (210)Po, the transfer of thorium isotopes from a cigarette to a smoker's body and lungs have been determined for the first time...
May 2016: Journal of Environmental Radioactivity
Marko Štrok, Borut Smodiš, Darja Mazej
A novel method for determination of (210)Pb activity concentration using a liquid scintillation counter (LSC) in environmental samples is presented. After radiochemical separation of (210)Pb on Eichrom Sr Resin column, the decay product (210)Bi starts to in-grow and interfere with the (210)Pb during measurement with LSC. Instead of eliminating this interference, a novel method utilises (210)Bi in-growth to improve the detection efficiency and subsequently to lower the minimum detectable activity (MDA). This allows for substantial reduction of the MDA compared to conventional methods...
March 2016: Applied Radiation and Isotopes
Yaru Yang, Ming Yang, Huijun Li, Ting Chen, Yuting Liu, Bin Liu
OBJECTIVE: To evaluate the relationship between structural integrity of descending motor tracts and motor status in patients with chronic ischemic stroke using diffusion tensor imaging (DTI). METHODS: From April 2012 to December 2013, 47 patients with chronic ischemic strok were recruited along with 20 matched normal controls. The DTI data was acquired and preprocessed. Bilateral descending motor tracts includingcorticospinal tract (CST) and alternate motor fibers (aMF) were constructed...
June 16, 2015: Zhonghua Yi Xue za Zhi [Chinese medical journal]
Maged Abdelnaseer, Nervana Elfayomi, Eman H Esmail, Manal M Kamal, Ahmed Hamdy, Rasha M Abdel Samie, Enji Elsawy
Atherosclerosis causes significant morbidity and mortality. Carotid intima media thickness (IMT) predicts future ischaemic strok e incidence. Matrix metalloproteinases (MMPs) play a considerable role in atherosclerosis and hold therapeutic promise as well. To investigate the relationship between serum level of matrix metalloproteinase-9 (MMP-9) and common carotid artery intima media thickness (CCA-IMT) in patients with ischaemic stroke and asymptomatic subjects. Thirty patients with a previous ischaemic stroke and 30 asymptomatic volunteers were recruited...
January 2016: Neurological Sciences
Marko Štrok, Holger Hintelmann, Brian Dimock
Hg concentrations in seawater are usually too low to allow direct (without pre-concentration and removal of salt matrix) measurement of its isotope ratios with multicollector-inductively coupled plasma mass spectrometry (MC-ICP-MS). Therefore, a new method for the pre-concentration of Hg from large volumes of seawater was developed. The final method allows for relatively fast (about 2.5Lh(-1)) and quantitative pre-concentration of Hg from seawater samples with an average Hg recovery of 98±6%. Using this newly developed method we determined Hg isotope ratios in seawater...
December 3, 2014: Analytica Chimica Acta
Ivana Vranjković, Nevenka Strok, Zeljka Topolovec, Dubravko Huljev
Venous insufficiency is one of the most common causes of chronic wounds. Venous ulcers account for about 75% of all leg ulcers, and 50% of venous leg ulcers require long-term treatment lasting for more than 1 year. The most common location of venous ulcers is the lower third of the leg, as it is the site of strongest venous pressure; less often there are multiple venous ulcers that tend to be localized on both lower legs. In addition to the negative impact on the quality of life, such as immobility, pain and social isolation, which significantly affect the course and length of treatment, we cannot ignore the high costs of long-term and often uncertain treatment, which poses a major health, social and economic problem in the world and in our country...
October 2013: Acta Medica Croatica: C̆asopis Hravatske Akademije Medicinskih Znanosti
Nevenka Strok, Dubravko Huljev
Chronic wound toilet, with appropriate care of the surrounding skin, is one of the basic steps that must be performed in the treatment of patients with chronic wound. On wound cleaning and bandaging, it is of utmost importance to choose an appropriate technique of cleansing, select an appropriate solution for leaching and choose an appropriate wound dressing. In this way, the wound is protected from dirt from the environment and microorganisms, while protecting the surrounding tissue from the wound exudate, providing optimal conditions for better and faster wound healing and contributing to improved patient quality of life...
October 2013: Acta Medica Croatica: C̆asopis Hravatske Akademije Medicinskih Znanosti
S Kervancioglu, A Sirikci, R Yigiter, Y Cakir, M Metin Bayram
Isolated spontaneous common carotid artery (CCA) dissection is rare. So far, surgical or medical treatment have only been reported in a few cases in the literature. We report a 39-year-old man, diagnosed as isolated spontaneous CCA dissection one year ago, who experienced a new minor stroke despite medical treatment. Because of the presence of new ischemic lesions on new magnetic resonance imaging despite medical treatment, and critical narrowing of internal carotid artery (ICA) orifice with jet and turbulence flow pattern at the bulbar portion of the ICA, endovascular management was performed with carotid stent deployment...
June 30, 2006: Neuroradiology Journal
Martina Rožmarić, Matea Rogić, Ljudmila Benedik, Marko Štrok, Delko Barišić
Results of 2 years monitoring of (210)Po and (210)Pb activity concentrations in soft tissue of the species Mytilus galloprovincialis from Croatian part of the Adriatic coast are presented. The samples were collected at thirteen coastal stations (some of which are also a part of the Mediterranean Mussel Watch Project) in spring and autumn of 2010 and 2011. The collected mussels were ranging between 4 cm and 6 cm in shell length. After sample pre-treatment lead and polonium were radiochemically separated on Sr resin...
November 2013: Chemosphere
Ivana Vranjković, Nevenka Strok, Dijana Sedmak, Brankica Grgurić, Dubravko Huljev
Despite the knowledge and the development of sophisticated procedures in the treatment of wounds, many clinicians are faced with the wounds that heal very slowly or they do not heal at all. In spite of repeated reconsideration of the treatment strategies and focusing on the biological factors, we still pay little attention to the psychosocial factors that are listed as one of the causes of atypical wounds. One factor is self-mutilation caused by psychological disorder called hospital addiction syndrome or Munchausen syndrome, which belongs to a group of the states called imaginary disorder where someone with great need for attention turns to disease or injury...
October 2012: Acta Medica Croatica: C̆asopis Hravatske Akademije Medicinskih Znanosti
Branko Petrinec, Marko Strok, Zdenko Franic, Borut Smodis, Dijana Pavicic-Hamer
Artificial and natural radionuclides were determined in the Adriatic Sea in the seawater and sediment samples in the period from 2007 to 2011. The sampling areas were coastal waters of Slovenia, Croatia and Albania, together with the deepest part of the Adriatic in South Adriatic Pit and Otranto strait. Sampling locations were chosen to take into account all major geological and geographical features of this part of the Adriatic Sea and possible coastal influences. After initial sample preparation steps, samples were measured by gamma-ray spectrometry...
2013: Radiation Protection Dosimetry
Martina Rožmarić, Matea Rogić, Ljudmila Benedik, Marko Strok
Activity concentrations of (234)U, (238)U, (226)Ra, (228)Ra, (210)Po and (210)Pb in all Croatian bottled drinking natural spring and natural mineral water products, commercially available on the market, were determined. The samples originated from various geological regions of Croatia. Activity concentrations of measured radionuclides are in general decreasing in this order: (234)U>(238)U>(226)Ra>(228)Ra>(210)Pb>(210)Po and (226)Ra>(228)Ra>(234)U>(238)U>(210)Pb>(210)Po for natural spring and mineral waters, respectively...
October 15, 2012: Science of the Total Environment
Anita Menon, Nicol Korner-Bitensky, Mark Chignell, Sharon Straus
RATIONALE AND OBJECTIVES: Rigorous usability testing of e-learn-ing resources is an important prerequisite to their wide-spread use among clinicians. This study demonstrates the application of an evidence-based approach to usability testing of two stroke-related e-learning resources (StrokEngine). METHODS: 14 stroke rehabilitation clinicians (occupational therapists and physiotherapists) from Ontario, Canada participated in a 1.5 h in-person testing session. Clinicians navigated StrokEngine in search of information to answer questions on stroke assessment/intervention...
April 2012: Journal of Rehabilitation Medicine
Marko Strok, Borut Smodiš
After the closure of the former Žirovski Vrh uranium mine in Slovenia, mining and milling wastes were deposited on two waste piles, which are located close to the mine. These wastes contain elevated levels of natural radionuclides from the uranium decay chain. Due to different migration processes (erosion, aerial deposition, through groundwater), these radionuclides can be transported via fodder into cow's milk, which is an important foodstuff for Slovenian people. Therefore, natural radionuclides were analysed in the transfer food chain from soil to cow's fodder and cow's milk...
August 2012: Journal of Environmental Radioactivity
Martina Rožmarić, Matea Rogić, Ljudmila Benedik, Marko Štrok, Delko Barišić, Astrid Gojmerac Ivšić
Activity concentrations of (210)Po and (210)Pb in the species Mytilus galloprovincialis from Croatian Adriatic coast were determined. The samples were collected in thirteen sampling places which are also a part of Croatian Mediterranean mussel watch project. The results of (210)Po and (210)Pb activity concentrations were found to vary between (22.1±2.5)-(207±21) Bq kg(-1) fresh weight and (2.8±1.4)-(9.3±0.7) Bq kg(-1) fresh weight, respectively. (210)Po/(210)Pb ratio ranged between 6.2 and 30.7. The highest measured activities were found in the enclosed basins of the Neretva channel, where the majority of Croatian mussel cultivation is taking place...
June 2012: Chemosphere
Branko Petrinec, Zdenko Franic, Nikolina Ilijanic, Slobodan Miko, Marko Strok, Borut Smodis
(137)Cs activity concentrations were studied in the sediment profiles collected at five locations in the Middle and South Adriatic. In the sediment profiles collected from the South Adriatic Pit, the deepest part of the Adriatic Sea, two (137)Cs peaks were identified. The peak in the deeper layer was attributed to the period of intensive atmospheric nuclear weapon tests (early 1960s), and the other to the Chernobyl nuclear accident (1986). Those peaks could be used to estimate sedimentation rates by relating them to the respective time periods...
August 2012: Radiation Protection Dosimetry
Marko Strok, Borut Smodiš, Klemen Eler
OBJECTIVE: The purpose of the study was to investigate natural radionuclide uptake and allocation by trees. MATERIALS AND METHODS: Samples from six Scots pines (P. sylvestris), six Norway spruces (Picea abies) and one sycamore maple (Acer pseudoplatanus) tree, growing on the Boršt uranium mill tailings waste pile in Slovenia were collected. (238)U, (230)Th, (226)Ra and (210)Pb activity concentrations in wood, shoots and 1-year-old needles or leaves were determined...
June 2011: Environmental Science and Pollution Research International
L D Gulay, M Daszkiewicz, O M Strok, A Pietraszko
The crystal structure of copper(I) lanthanum selenide, La(3)Cu(4.88)Se(7), obtained from the La(2)Se(3)-Cu(2)Se quasi-binary system, has been investigated using X-ray single-crystal diffraction. The positions of the La and Se atoms are ordered and lie on mirror planes, whereas all positions for the Cu atoms are partially occupied. The crystal is built from edge-sharing [LaSe(6)] and [LaSe(7)] polyhedra. The five positions for the Cu atoms determine an ionic diffusion pathway in the structure.
March 2011: Acta Crystallographica. Section C, Crystal Structure Communications
Marko Strok, Borut Smodiš
²¹⁰Po and ²¹⁰Pb activity concentrations in fish from the Slovenian part of Adriatic Sea, in the vicinity of a former uranium mine at Žirovski vrh and from the Slovenian market were determined. In addition, ²¹⁰Po and ²¹⁰Pb activity concentrations in squid from the Slovenian market and in mussels from the Slovenian part of the Adriatic Sea were also determined. Fish, squid and mussel consumption in Slovenia was assessed from the data available from Eurostat and Food and Agriculture Organisation (FAO) and the data used for the corresponding dose calculation...
February 2011: Chemosphere
L Benedik, U Repinc, M Strok
Radium-226 is one of the best known long-lived alpha-emitters abundantly present in the environment. The determination of radium isotopes in environmental samples usually requires a demanding chemical separation before measurement and quantification. Each step in the chemical separation process can involve losses of the analyte, therefore it is of vital importance that the recovery of the whole radiochemical procedure is evaluated. The emphasis of the work presented was determination of the chemical recovery using the different yield tracers Ra-223, Ra-225 and Ba-133...
July 2010: Applied Radiation and Isotopes
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