Publications by authors named "Pawel Dąbrowski"

34 Publications

Seabed Topography Changes in the Sopot Pier Zone in 2010-2018 Influenced by Tombolo Phenomenon.

Sensors (Basel) 2020 Oct 24;20(21). Epub 2020 Oct 24.

Department of Geodesy and Oceanography, Gdynia Maritime University, Morska 81-87, 81-225 Gdynia, Poland.

Bathymetric surveys of the same body of water, performed at regular intervals, apart from updating the geospatial information used to create paper and electronic maps, allow for several additional analyses, including an evaluation of geomorphological changes occurring in the coastal zone. This research is particularly important in places where the shape of the coastal zone has been violently disturbed, including by human activity. Tombolo is such a phenomenon and it dynamically shapes the new hydrological conditions of the coastal zone. Apart from natural factors, it may be caused by the construction of hydrotechnical facilities in the littoral zone. It causes a significant disturbance in the balance of the marine environment, resulting in the bottom accretion and dynamic changes in the coastline. This has been the case since 2010 in Sopot, where the rapidly advancing tombolo is not only changing environmental relations but also threatening the health-spa character of the town by stopping the transport of sand along the coast. This paper analyses changes in seabed shape in the pier area in Sopot between 2010 and 2018. In the analysis, both archival maps and bathymetric surveys over a period of 8 years were used; based on these, numerical bottom models were developed and their geospatial changes were analyzed. The results showed that changes in the seabed in this area are progressing very quickly, despite periodic dredging actions organized by administrative bodies.
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http://dx.doi.org/10.3390/s20216061DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7663187PMC
October 2020

Digital Filtering of Railway Track Coordinates in Mobile Multi-Receiver GNSS Measurements.

Sensors (Basel) 2020 Sep 4;20(18). Epub 2020 Sep 4.

Faculty of Civil and Environmental Engineering, Gdańsk University of Technology, 80-233 Gdańsk, Poland.

The article discusses an important issue in connection with the technique of mobile Global Navigation Satellite System (GNSS) measurements of railway track coordinates, which is digital filtering performed to precisely determine railway track axes. For this purpose, a measuring technique is proposed which bases on the use of a measuring platform with a number of appropriately distributed GNSS receivers, where two of them determine the directional base vector of the platform. The receivers used in the research had high measuring frequency in the Real Time Kinematic (RTK) operating mode and enabled correction of the obtained results in post-processing. A key problem discussed in the article is the method for assessing the quality of the measurement results obtained from GNSS receivers, and their preparation for further processing making use of geometrically constrained parameters of the base vector and specialized digital filtering, among other elements, to precisely determining the track axis. The obtained results confirm the applicability of the used method of GNSS signal processing.
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http://dx.doi.org/10.3390/s20185018DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7570957PMC
September 2020

Application of Least Squares with Conditional Equations Method for Railway Track Inventory Using GNSS Observations.

Sensors (Basel) 2020 Sep 1;20(17). Epub 2020 Sep 1.

Department of Rail Transportation and Bridges, Faculty of Civil and Environmental Engineering, Gdansk University of Technology, 80-233 Gdansk, Poland.

Satellite geodetic networks are commonly used in surveying tasks, but they can also be used in mobile surveys. Mobile satellite surveys can be used for trackage inventory, diagnostics and design. The combination of modern technological solutions with the adaptation of research methods known in other fields of science offers an opportunity to acquire highly accurate solutions for railway track inventory. This article presents the effects of work carried out using a mobile surveying platform on which Global Navigation Satellite System (GNSS) receivers were mounted. The satellite observations (surveys) obtained were aligned using one of the methods known from classical land surveying. The records obtained during the surveying campaign on a 246th km railway track section were subjected to alignment. This article provides a description of the surveying campaign necessary to obtain measurement data and a theoretical description of the method employed to align observation results as well as their visualisation.
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http://dx.doi.org/10.3390/s20174948DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7506772PMC
September 2020

Evaluation of the Possibility of Identifying a Complex Polygonal Tram Track Layout Using Multiple Satellite Measurements.

Sensors (Basel) 2020 Aug 7;20(16). Epub 2020 Aug 7.

Department of Rail Transportation and Bridges, Gdańsk University of Technology, Gabriela Narutowicza 11-12, 80-233 Gdańsk, Poland.

We present the main assumptions about the algorithmization of the analysis of measurement data recorded in mobile satellite measurements. The research team from the Gdańsk University of Technology and the Maritime University in Gdynia, as part of a research project conducted in cooperation with PKP PLK (Polish Railway Infrastructure Manager), developed algorithms supporting the identification and assessment of track axis layout. This article presents selected issues concerning the identification of a tramway line's axis system. For this purpose, the supporting algorithm was developed and measurement data recorded using Global Navigation Satellite System (GNSS) techniques was evaluated and analyzed. The discussed algorithm identifies main track directions from multi-device data and repeated position recordings. In order to observe the influence of crucial factors, the investigated route was carefully selected. The chosen tramway track was characterized by its location in various field conditions and a diversified and complex geometric layout. The analysis of the obtained results was focused on the assessment of the signal's dispersion and repeatability using residuals in relation to the estimated track's direction. The presented methodology is intended to support railway infrastructure management processes, mainly in planning and maintenance through an efficient inventory of the infrastructure in service.
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http://dx.doi.org/10.3390/s20164408DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7472056PMC
August 2020

Using UAV Photogrammetry to Analyse Changes in the Coastal Zone Based on the Sopot Tombolo (Salient) Measurement Project.

Sensors (Basel) 2020 Jul 18;20(14). Epub 2020 Jul 18.

Department of Navigation and Hydrography, Polish Naval Academy, Smidowicza 69, 81-127 Gdynia, Poland.

The main factors influencing the shape of the beach, shoreline and seabed include undulation, wind and coastal currents. These phenomena cause continuous and multidimensional changes in the shape of the seabed and the Earth's surface, and when they occur in an area of intense human activity, they should be constantly monitored. In 2018 and 2019, several measurement campaigns took place in the littoral zone in Sopot, related to the intensive uplift of the seabed and beach caused by the tombolo phenomenon. In this research, a unique combination of bathymetric data obtained from an unmanned surface vessel, photogrammetric data obtained from unmanned aerial vehicles and ground laser scanning were used, along with geodetic data from precision measurements with receivers of global satellite navigation systems. This paper comprehensively presents photogrammetric measurements made from unmanned aerial vehicles during these campaigns. It describes in detail the problems in reconstruction within the water areas, analyses the accuracy of various photogrammetric measurement techniques, proposes a statistical method of data filtration and presents the changes that occurred within the studies area. The work ends with an interpretation of the causes of changes in the land part of the littoral zone and a summary of the obtained results.
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http://dx.doi.org/10.3390/s20144000DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7411703PMC
July 2020

Surface-Bound and Volatile Mo Oxides Produced During Oxidation of Single MoS Crystals in Air and High Relative Humidity.

Materials (Basel) 2020 Jul 9;13(14). Epub 2020 Jul 9.

Department of Solid State Physics, Faculty of Physics and Applied Informatics, University of Lodz, Pomorska 149/153, 90-236 Lodz, Poland.

We report on the MoO oxides and their derivatives on microscopic 2H MoS flakes oxidized in air and high relative humidity at a moderate temperature range below 410 °C. We combine XPS and AFM measurements such as topography, friction, creation of nanoscale ripples and scratches on the MoS flakes deposited on Si substrates. We detect MoO oxides mostly by measuring selected nanomechanical properties of the MoO layer, such as its compressive mechanical stress at the plastic yield. We discuss basal surface coverage of the single MoS flakes by the MoO oxides. We discuss conditions for appearance of all possible MoO oxide derivatives, such as molybdenum(VI) hydroxyoxides and MoO hydrates. Our findings agree with an expected mechanistic switch in thermal oxidation in water vapors vs. air.
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http://dx.doi.org/10.3390/ma13143067DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7412186PMC
July 2020

Assessing weaning stress - Relations between enamel hypoplasia, δO and δC values in human teeth obtained from early modern cemeteries in Wroclaw, Poland.

Ann Anat 2020 Nov 20;232:151546. Epub 2020 Jun 20.

Institute of Geological Sciences, Polish Academy of Sciences, Research Centre in Warszawa, Wroclaw, Poland.

Objectives: The aim of this paper is to assess linear enamel hypoplasia (LEH) on canines of adults from early modern Wroclaw cemeteries to compare δC and δO values in enamel formed before, during and after LEH formation, and to attempt to find a link between the selected indicators of the weaning process.

Material And Methods: 15 permanent canines with visible LEH were selected for analysis. Age at LEH formation was estimated using the Reid and Dean method. The perikymata count was used to estimate the duration of LEH formation. Incremental stable oxygen and carbon isotopes analysis was performed on tooth enamel to infer stress related to weaning and dietary patterns. Kruskal-Wallis ANOVA, Mann-Whitney U test and Spearman correlation were used in statistical inference.

Results: The average age of LEH formation was 3.14 years, with an average duration of 111 days. Stable carbon isotope values consistently increase in 73% of the individuals sampled. The values of δO do not show a dominant pattern. The average value of δC increases over the time of enamel formation. The δC values collected below LEH were negatively correlated with δO values and the duration of LEH termination.

Conclusions: Marking of carbon and oxygen isotopes indicates different stages of weaning. Advancements in diet change (determined by higher δC) corresponds with faster recovery after physiological stress episode. There is no evidence for different breastfeeding models between distinct parishes in early modern Wroclaw.
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http://dx.doi.org/10.1016/j.aanat.2020.151546DOI Listing
November 2020

Accuracy Analysis of Measuring X-Y-Z Coordinates with Regard to the Investigation of the Tombolo Effect.

Sensors (Basel) 2020 Feb 20;20(4). Epub 2020 Feb 20.

Faculty of Navigation, Gdynia Maritime University. Morska 81-87, 81-225 Gdynia, Poland.

Tombolo is a narrow belt connecting the mainland with an island lying near the shore. It is formed as a result of sand and gravel being deposited by sea currents. In consequence, the seabed constantly rises and the shoreline moves towards the sea. This paper deals with accuracy analysis of the undertaken tombolo effect investigation, namely estimation of uncertainty of the measurement results. The aforementioned analysis concerns two methods used for creating a 3D beach model: Firstly, based on geodetic laser scanning (TLS-terrestrial laser scanning) and secondly, using images from unmanned aerial vehicles (UAV). The presented exemplary estimation of uncertainty of the measurement of coordinates X-Y-Z is based on the Polish case study.
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http://dx.doi.org/10.3390/s20041167DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7070393PMC
February 2020

Post-traumatic bilateral scapular and thoracic vertebral body fractures - a case report.

Pol Merkur Lekarski 2019 Dec;47(282):229-231

Medical Faculty of Łazarski University, Warsaw, Poland.

The simultaneous fracture of both scapulae with coexisting fracture of the thoracic vertebral body is observed extremely rarely and is fully dependent on the mechanism that caused them.

A Case Report: The 59-year-old patient was admitted to the trauma and orthopedic department because of back pain and the inability to move independently. A few hours earlier he suffered bludgeoning trauma from a thick branch falling from a tree. During the physical examination significant limitation the range of motion in shoulder joints with was found. <15 ° flexion and <30 ° abduction, with limited external rotation in the right shoulder joint, and <15 ° flexion and <15 ° abduction, with significant external rotation deficiency. Normal range of motion in both hands was preserved. No sensory deficits or paresis were observed. Radiographic examination revealed the presence of a multifragmentary fracture of both scapulae and a fracture of the Th9 vertebral body, which was confirmed by computed tomography of the chest. The patient was qualified for conservative treatment of scapular fractures and was fitted with an abduction splint for the left shoulder. The Th9 vertebral body required surgical approach. The patient underwent transpedicular stabilization of the Th7,8,9,10 vertebrae with precontoured rods for the kyphotic deformation of the spine. After the procedure, the patient was provided with Javette's brace strengthening the spine correction and discharged for further outpatient observation.

Conclusions: Fracture of the scapula is one of the most demanding fractures to diagnose in the classic radiological examination. CT scans with 3D reconstruction can be considered to be the "gold standard". Surgical procedures is indicated for patients with severe comminution of fracture fragments and neurological symptoms. Minor fracture displacements can be conservatively treated. Coexisting Th9 vertebra fracture in this case required surgery by posterior transpedicular stabilization.
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December 2019

Comparative analysis of positioning accuracy of Samsung Galaxy smartphones in stationary measurements.

PLoS One 2019 18;14(4):e0215562. Epub 2019 Apr 18.

Department of Geodesy and Oceanography, Gdynia Maritime University, Gdynia, Poland.

Achieving single meter positioning accuracy by portable mobile devices still poses a major challenge to the satellite signal receivers constructors, despite gradual constellation completing process and the progress achieved in last decades. Nowadays popular smartphones are multifunctional devices that serve also as a personal navigation tool in navigation and sport activities using the global navigation satellite systems (GNSS) receivers installed. It would seem that introducing newer models to the global market would cause constant progress in the accuracies obtained, however, the study results do not confirm that. This study focused on Galaxy series smartphones of Samsung, one of the leading manufacturers worldwide, to examine its technological progress. The aim was to verify the thesis using statistical models and analyses to compare succeeding generations of smartphones on six devices from the series. The authors conducted two synchronous stationary measurement campaigns of 24 and 12 hours with one-second interval in obstacle-free environment which provided 70000+ and 30000+ statistical samples of position measurements. The reference values of true smartphones coordinates were determined by means of state-of-the-art precise surveying instruments and geodetic calculations. The results indicate that two newest generations of the Galaxy series included in the research, namely S6 and S7, obtained lower accuracies than their predecessors. Against the backdrop of lack of public availability of smartphones technical parameters, the conducted research results are relevant especially to smartphones positioning service users community.
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http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0215562PLOS
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6472772PMC
January 2020

Diagnodent and VistaCam may be unsuitable for the evaluation of dental caries in archeological teeth.

Am J Phys Anthropol 2019 04 29;168(4):797-808. Epub 2019 Jan 29.

Department of Conservative Dentistry and Pedodontics, Wroclaw Medical University, Wroclaw, Poland.

Objectives: The aim of the study was to compare the usefulness of fluorescence-based caries detection systems (Diagnodent and VistaCam) for the assessment of carious lesions on archeological molars.

Materials And Methods: The study material consisted of teeth from the Cemetery of St. Mary Magdalene (Cmentarz św. Marii Magdaleny) in Wrocław, Poland. A sample of 178 permanent molars from 38 skulls were examined. Five surfaces of teeth (occlusal, mesial, distal, buccal, and lingual) were assessed on either basically cleaned or sandblasted teeth. Six diagnostic methods were used to detect carious lesions: the visual classification of the International Caries Detection and Assessment System (ICDAS II), fluorescent methods (Diagnodent and VistaCam), X-ray, cone beam computed tomography and histological sections. The sensitivity and specificity of the methods were determined using receiver operating characteristic (ROC) curves and the correlation between the severity of dental caries and the readouts obtained with each method.

Results: In most cases, Diagnodent and VistaCam yielded unsatisfactory specificity and sensitivity values. The area under curve (AUC) values in ROC curves for Diagnodent and Vistacam were lower than the AUC values obtained for the ICDAS II visual classification.

Conclusions: According to our results, in the case of archeological teeth, neither Diagnodent nor VistaCam can be regarded as a better diagnostic method than the ICDAS II visual classification of caries.
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http://dx.doi.org/10.1002/ajpa.23785DOI Listing
April 2019

Influence of physiological stress on the presence of hypoplasia and fluctuating asymmetry in a medieval population from the village of Sypniewo.

Int J Paleopathol 2017 12 14;19:43-52. Epub 2017 Oct 14.

Department of Conservative Dentistry and Pedodontics, Wroclaw Medical University, ul. Krakowska 26, 50-425 Wroclaw, Poland.

This study aims to estimate the levels of physiological stress in the medieval rural population of Sypniewo by evaluating patterns of fluctuating asymmetry (FA) and enamel hypoplasia (EH), and provide information on the influence of physiological stress during the prenatal and perinatal period on early childhood development. Stress is defined as any external or internal condition that challenges homeostasis of an organism. FA is associated with physiological stress occurring mainly during prenatal development and early childhood. The level of FA is thought to reflect the intensity of the stressor(s). EH is caused by physiological stress such as nutritional instability during the first years of life. The studied material consisted of 126 skulls from the village of Sypniewo (Poland). Cranial radiographs were taken in postero-anterior (P-A) and basal views. The images were scanned and calibrated. Measurements of the cranium were used to estimate FA. The presence of EH was assessed using standard anthropological methods The highest levels of FA were observed in the region of the cranial base. EH was observed in 29% of individuals from the rural skeletal series. There was no statistically significant correlation between FA and EH occurrence or between sex and the studied stress indicators.
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http://dx.doi.org/10.1016/j.ijpp.2017.10.002DOI Listing
December 2017

The sequence of lanugo pattern development on the trunk wall in human fetuses.

Adv Clin Exp Med 2017 Sep;26(6):967-972

Department of Anatomy, Wroclaw Medical University, Poland.

Background: Due to a growing interest in developmental disorders, and in the long-term skin appendage diseases, both in the cosmetic industry and among specialists in dermatology (broadly defined), there is an increasing number of papers on hair development. The publications by the present team of authors are part of this trend.

Objectives: The aim of the study was to describe the topography and typology of skin pilosity patterns in human fetuses.

Material And Methods: A total of 278 fetuses (141 male and 137 female) were qualified for the study. The gestational age ranged from 69 to 226 days after conception. All fetuses were taken from a local collection.

Results: The study revealed that the first single hairs occur on the posterior wall of the trunk in the 17th week of fetal life, and on the anterior wall between the 18th and 19th week. It was found that in human fetuses lanugo appears statistically significantly later on the skin of the anterior of the trunk than on its posterior. The difference in absolute time is almost 2 weeks of fetal life. No other differences were found in the development cycle of lanugo on the anterior and posterior walls of the trunk. A full pattern was first observed on the posterior wall of the trunk in a fetus in the 19th week, and on the anterior wall in the 21st week. It was found that the process of lanugo development was completed on the posterior wall in the 23rd week, and on the surface of the abdomen in the 26th week.

Conclusions: The lanugo developmental cycle, consisting in the appearance of the first single hairs, then partial hair and subsequently the formation of final patterns, is the same on both walls of the trunk.
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http://dx.doi.org/10.17219/acem/61440DOI Listing
September 2017

Wrist ultrasound examination - scanning technique and ultrasound anatomy. Part 2: Ventral wrist.

J Ultrason 2017 Jun 30;17(69):123-128. Epub 2017 Jun 30.

Department of General and Pediatric Radiology, Wroclaw Medical University, Wroclaw, Poland.

Ultrasound imaging of the musculoskeletal system is an important element of the diagnostic and therapeutic protocol. Clinical decisions, including those regarding surgical procedures, are often based solely on ultrasound imaging. However, detailed knowledge on the anatomy and a correct scanning technique are crucial for an accurate diagnosis. Modern ultrasonographic equipment allows obtaining detailed anatomical images of muscle tendons, ligaments, nerves and vessels of the carpal area. Ventral wrist ultrasound is one of the most common diagnostic procedures in patients with suspected carpal tunnel syndrome. Ventral wrist evaluation is also often performed in patients with wrist pain of unclear etiology, rheumatic diseases, wrist injuries or symptoms of ulnar neuropathy. The aim of this paper is to present ultrasound images with corresponding anatomical schemes. The technique of ultrasound examination of the ventral wrist along with practical guidance to help obtain highly diagnostic images is also discussed. The present paper is the second part of an article devoted to ultrasound anatomy and wrist ultrasound technique - the part discussing the dorsal side of the wrist was published in the Journal of Ultrasonography, Vol. 15, No 61. The following anatomical structures should be visualized during an ultrasound examination of the ventral wrist, both in the carpal tunnel as well as proximally and distally to it: four flexor digitorum superficialis tendons, four flexor digitorum profundus tendons, flexor pollicis longus, flexor carpi radialis tendon, median nerve and flexor retinaculum; in the carpal tunnel as well as proximally and distally to it: the ulnar nerve, ulnar artery and veins; the tendon of the flexor carpi ulnaris muscle; carpal joints.
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http://dx.doi.org/10.15557/JoU.2017.0018DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5516083PMC
June 2017

The face of conflict: Significant sharp force trauma to the mid-facial skeleton in an individual of probable 16th-17th century date excavated from Byczyna, Poland.

Int J Paleopathol 2017 06 28;17:75-78. Epub 2017 Feb 28.

Department of Archaeology, Institute of History, University of Opole, Opole, Poland.

A variety of injuries have always been associated with violence, consequences of which people had to deal with. In this paper we present a complex of craniofacial and dental injuries resulted from sharp force trauma. The basis of our study was historical skeletal material excavated from archeological site in Byczyna (11th-17th century), Poland. An individual whose skeleton was exhumed from the grave No. 610 exhibited healed, oblique trauma of the left maxilla, damage to the crowns of right central and lateral incisors and concomitant luxation of the right maxillary central incisor. We describe the mechanism of this trauma and complications that resulted from damage to the masticatory apparatus.
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http://dx.doi.org/10.1016/j.ijpp.2017.02.003DOI Listing
June 2017

Bis(Cyclic Alkyl Amino Carbene) Ruthenium Complexes: A Versatile, Highly Efficient Tool for Olefin Metathesis.

Angew Chem Int Ed Engl 2017 01 12;56(4):981-986. Epub 2016 Dec 12.

Apeiron Synthesis SA, Duńska 9, 54-427, Wrocław, Poland.

The state-of-the-art in olefin metathesis is application of N-heterocyclic carbene (NHC)-containing ruthenium alkylidenes for the formation of internal C=C bonds and of cyclic alkyl amino carbene (CAAC)-containing ruthenium benzylidenes in the production of terminal olefins. A straightforward synthesis of bis(CAAC)Ru indenylidene complexes, which are highly effective in the formation of both terminal and internal C=C bonds at loadings as low as 1 ppm, is now reported.
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http://dx.doi.org/10.1002/anie.201609009DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5299612PMC
January 2017

Cardiovascular Risk Factors Among Lower Silesian Students of the Faculty of Medicine: Knowledge and Distribution.

Adv Clin Exp Med 2016 Mar-Apr;25(2):341-7

Department of Pathophysiology, Wroclaw Medical University, Poland.

Background: Cardiovascular disease is a major contributor to the global burden of disease. Further reduction of cardiovascular mortality will require multidirectional prevention. Popularizing prevention measures requires the involvement of qualified and well-educated personnel. Before any modifications of educational programs it is necessary to assess the level of knowledge of future physicians.

Objectives: The aim of the study was to evaluate medical students' knowledge of cardiovascular (CV) risk factors. The paper presents the outcomes of a study investigating the knowledge of CV risk factors and the prevalence of those risk factors in the study population.

Material And Methods: The study was conducted between 2007 and 2012 and the study population was comprised of 1406 students (497 men and 909 women) from South and South Western Poland. A survey designed by the authors, based on the Framingham survey, was used for the interviews.

Results: The students correctly identified 4.38 ± 0.91 CV risk factors. The most frequently listed risk factors for cardiovascular diseases were a lack of physical activity and a fat-rich diet. The study participants who identified CV risk factors more or less accurately do not follow the recommendations aimed at prevention. Awareness, even relatively high awareness, does not correlate with a healthy lifestyle. Extreme examples of this are people who are aware of the negative effects of cigarette smoking but continue to smoke.

Conclusions: The study revealed an insufficient level of awareness of CV risk factors among medical students.
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http://dx.doi.org/10.17219/acem/33466DOI Listing
December 2016

Graphene growth on Ge(100)/Si(100) substrates by CVD method.

Sci Rep 2016 Feb 22;6:21773. Epub 2016 Feb 22.

Institute of Electronic Materials Technology, Wolczynska 133, 01-919 Warsaw, Poland.

The successful integration of graphene into microelectronic devices is strongly dependent on the availability of direct deposition processes, which can provide uniform, large area and high quality graphene on nonmetallic substrates. As of today the dominant technology is based on Si and obtaining graphene with Si is treated as the most advantageous solution. However, the formation of carbide during the growth process makes manufacturing graphene on Si wafers extremely challenging. To overcome these difficulties and reach the set goals, we proposed growth of high quality graphene layers by the CVD method on Ge(100)/Si(100) wafers. In addition, a stochastic model was applied in order to describe the graphene growth process on the Ge(100)/Si(100) substrate and to determine the direction of further processes. As a result, high quality graphene was grown, which was proved by Raman spectroscopy results, showing uniform monolayer films with FWHM of the 2D band of 32 cm(-1).
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http://dx.doi.org/10.1038/srep21773DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4761869PMC
February 2016

A migrating vascular haemostatic clip induced myocardial infarction 8 years after pulmonary lobectomy: successful percutaneous treatment with a distal protection basket.

Eur Heart J 2016 Apr 9;37(16):1324. Epub 2015 Nov 9.

Department of Cardiology, The Pope John Paul II Hospital, Al. Jana Pawla II 10, Zamosc 22-400, Poland.

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http://dx.doi.org/10.1093/eurheartj/ehv600DOI Listing
April 2016

Population genomics of Bronze Age Eurasia.

Nature 2015 Jun;522(7555):167-72

Centre for GeoGenetics, Natural History Museum, University of Copenhagen, Øster Voldgade 5-7, 1350 Copenhagen K, Denmark.

The Bronze Age of Eurasia (around 3000-1000 BC) was a period of major cultural changes. However, there is debate about whether these changes resulted from the circulation of ideas or from human migrations, potentially also facilitating the spread of languages and certain phenotypic traits. We investigated this by using new, improved methods to sequence low-coverage genomes from 101 ancient humans from across Eurasia. We show that the Bronze Age was a highly dynamic period involving large-scale population migrations and replacements, responsible for shaping major parts of present-day demographic structure in both Europe and Asia. Our findings are consistent with the hypothesized spread of Indo-European languages during the Early Bronze Age. We also demonstrate that light skin pigmentation in Europeans was already present at high frequency in the Bronze Age, but not lactose tolerance, indicating a more recent onset of positive selection on lactose tolerance than previously thought.
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http://dx.doi.org/10.1038/nature14507DOI Listing
June 2015

Remembrance of professor Tadeusz Marciniak - Lviv tradition in Wrocław.

Adv Clin Exp Med 2015 Jan-Feb;24(1):173-8

Department of Anatomy, Wroclaw Medical University, Poland.

After the seizure of Lviv by the Soviets, in the years 1944-1946, Tadeusz Marciniak worked in the Descriptive Anatomy Department in the State-Medical Institute of Lviv and also performed the function of the dean of the Medical Faculty. On receiving a proposal to assume the Chair of the Anatomy Department in Wrocław, he made the decision to leave Lviv. By July 2nd, 1946, prof. Tadeusz Marciniak had taken over the duties of full professor of the Descriptive Anatomy Department of the Medical Faculty of the University and the Technical College of Wrocław. On taking his job in Wrocław, prof. Marciniak undertook attempts to restore the worn out parts of the Anatomy Department building. Due to the lack of Polish manuals, he also took to the preparation of scripts for medical students. Professor Marciniak was a member of the Wrocław Section of the Polish Anthropological Association and a regular member of the Wroclaw Association of Science. His main scientific interests referred to the morphogenesis of the central nervous system and urinary system. He concentrated on circulatory system and muscular system tetralogies. Professor Marciniak also actively participated in administrative work at the university. In the years 1947-1948, he held the office of associate dean of the Medical Faculty, and till 1950 was a member of the Senate of the University and Technical College of Wrocław. In the years 1959-1962, he was a vice rector of the Medical University of Wrocław.
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http://dx.doi.org/10.17219/acem/38084DOI Listing
June 2015

Dual chamber cardioverter-defibrillator used for His bundle pacing in patient with chronic atrial fibrillation.

Int J Cardiol 2015 Mar 30;182:395-8. Epub 2014 Dec 30.

Department of Cardiology, Klodzko County Hospital, Klodzko, Poland; Department of Cardiology, Wroclaw Medical University, Wroclaw, Poland. Electronic address:

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http://dx.doi.org/10.1016/j.ijcard.2014.12.129DOI Listing
March 2015

Electrocardiogram teletransmission and teleconsultation: essential elements of the organisation of medical care for patients with ST segment elevation myocardial infarction: a single centre experience.

Kardiol Pol 2014 10;72(4):345-54. Epub 2014 Jan 10.

Samodzielny Publiczny Szpital Wojewódzki im. Papieża Jana Pawła II w Zamościu.

Background: Optimal treatment of ST segment elevation myocardial infarction (STEMI) should be initiated immediately. System delay is considered an important indicator of quality of care in STEMI, and at the same time it is an independent predictor of clinical outcomes. It can be modified largely by introducing organisational changes. Although conditions have been created in Poland for common use of electrocardiogram (ECG) teletransmission and direct transfer of all STEMI patients to cardiac catheterisation laboratories, no uniform management algorithms have been introduced.

Aim: To summarize several years of our experience with the use of ECG teletransmission and teleconsultation system in a Polish rural region, present conclusions drawn from practical use of the suggested management algorithm, and compare effectiveness of this system in its early and established phases.

Methods: The reported network consists of a single percutaneous coronary intervention (PCI)-capable hospital, emergency medical services (EMS) system, and several local non-PCI-capable hospitals. We extensively discussed the management algorithm based on prehospital diagnosis with ECG teletransmission and teleconsultation, and direct patient transfer to a PCI-capable hospital. Delays seen immediately after the system was introduced were compared with data obtained after several years of its stable functioning.

Results: In 2005-2013, the average time to STEMI reperfusion therapy (total delay) was 282.3 (median 213) min, patient-related delay was 164.1 (median 74) min, and system delay was 116.8 (median 111) min. Primary PCI was performed in 93% of STEMI patients, with 21.1% of patients treated within 90 min after the first medical contact (FMC) and 61.1% of patients treated within 120 min after FMC. In 2006-2010, no significant change in the total delay was seen (340 min in 2006 vs. 311 min in 2010, p = 0.1429). A significant reduction was seen in the system delay both overall (-8.3%, p = 0.0318) and in hospital (-24.0%, p < 0.0001). Primary PCI was performed within 90 min after FMC in 14.0% of patients in 2006 and in 30.6% of patients in 2010 (+118.6%, p = 0.0049), and within 120 min after FMC in 55% and 62.2% of patients, respectively (p = 0.3008). The delay from FMC to the diagnosis decreased (-32.1%, p = 0.0356) but the overall EMS delay did not change (102.7 vs. 103.7 min, p = 0.6725). Patient transfer time to the cardiac catheterisation laboratory remained unchanged (54.8 vs. 60.1 min, p = 0.0828), as was the patient-related delay (161.9 vs. 150.2 min, p = 0.2801).

Conclusions: An ECG teletransmission and teleconsultation system reduces the system delay. ECG teletransmission systems work well in rural areas with low population density and a single large PCI-capable hospital. With increasing experience, a gradual increase in the effectiveness of management protocols involving ECG teletransmission is seen.
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http://dx.doi.org/10.5603/KP.a2013.0352DOI Listing
December 2016

Long-term follow-up after pacemaker implantation via persistent left superior vena cava.

Cardiol J 2014 21;21(4):413-8. Epub 2013 Oct 21.

Department of Cardiology, John Paul II Hospital, Zamosc, P oland.

Background: The persistent left superior vena cava (PLSVC) is a relatively common con-genital venous return anomaly. It may have serious clinical implications especially in case of pacemaker/cardioverter-defibrillator implantation, venous catheter insertion, radio-frequency ablation and cardiac surgery. There is also some evidence that PLSVC may be accompanied by arrhythmias. The aim of this report is to present the effectiveness and safety of cardiac pacing via PLSVC, clinical outcome and appearance of arrhythmias in a long-term follow-up.

Methods And Results: Four cases of pacing electrodes implanted via PLSVC in patients without any other cardiac congenital heart anomalies were observed for at least 6 years. There was 1 patient with AAI, 2 patients with VVI, and 1 with DDD pacemaker. Atrial electrodes were implanted on the free right atrial wall, 2 ventricular electrodes were implanted in right ventricular outflow tract, 1 in postero-lateral cardiac vein. During the mean 110 months of observation, pacing was efficient. One patient underwent an upgrade from AAI to biatrial pac-ing due to progressive interatrial conduction delay during the follow-up. No other intervention or pacemaker related events were noticed except for battery replacement.

Conclusions: The presence of PSVC may complicate implantation, but it does not influence the long-term follow-up of pacing parameters.
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http://dx.doi.org/10.5603/CJ.a2013.0145DOI Listing
April 2016

The tooth of a Neanderthal child from Stajnia Cave, Poland.

J Hum Evol 2013 Mar 8;64(3):225-31. Epub 2013 Feb 8.

Department of Human Biology, Wrocław University, ul. Kuźnicza 35, 50-138 Wrocław, Poland.

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http://dx.doi.org/10.1016/j.jhevol.2012.12.001DOI Listing
March 2013

Effects of extraction condition on structural features and anticoagulant activity of F. vesca L. conjugates.

Carbohydr Polym 2013 Jan 12;92(1):741-50. Epub 2012 Oct 12.

Regional Specialist Hospital in Wrocław, Research and Development Centre, ul. Kamieńskiego 73a, 51-124 Wrocław, Poland.

From the air-dried Wild strawberry (Fragaria vesca L., family Rosaceae) leaves five water-soluble glycoconjugates Fv I-V by different extraction conditions have been isolated. Effects of extraction steps/agents on chemical composition and anticoagulant activity of Fv I-V were examined. Dark brown F. vesca conjugates Fv I-V were recovered in 4.5-8.4% yields, based on dry herb. Isolates were composed of carbohydrate, phenolic and protein components. Fv I-V displayed on HPLC broad molecule-mass distribution patterns with dominance of low molecule-masses 9-14 kDa. Their carbohydrate parts revealed high hexuronic acids content (35-60%) while the dominant neutral sugars - galactose, arabinose and rhamnose were found in lower amounts and indicated the presence of rhamnogalacturonans associated with arabinogalactans in all F. vesca preparations. In all Fv I-V isolates high polyphenolic contents were determined, whereas proteins were found in low amounts only. In in vitro experiments on human pooled plasma Fv I-V showed at higher concentrations complete inhibition of plasma clot formation and the most active conjugates in aPTT, PT and TT tests were shown to be Fv I and Fv III, containing the highest amounts of phenolics.
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http://dx.doi.org/10.1016/j.carbpol.2012.10.011DOI Listing
January 2013

Morphological adaptation to climate in modern Homo sapiens crania: the importance of basicranial breadth.

Coll Antropol 2011 Sep;35(3):625-36

University of Wroclaw, Department of Anthropology, Wroclaw, Poland.

The aim of this study is to investigate whether the variation in breadth of the cranial base among modern human populations that inhabit different regions of the world is linked with climatic adaptation. This work provides an examination of two hypotheses. The first hypothesis is that the correlation between basicranial breadth and ambient temperature is stronger than the correlation between temperature and other neurocranial variables, such as maximum cranial breadth, maximum neurocranial length, and the endocranial volume. The second hypothesis is that the correlation between the breadth of the cranial base and the ambient temperature is significant even when other neurocranial features used in this study (including the size of the neurocranium) are constant. For the sake of this research, the necessary neurocranial variables for fourteen human populations living in diverse environments were obtained from Howells' data (except for endocranial volume which was obtained by means of estimation). The ambient temperature (more precisely, the mean yearly temperature) of the environments inhabited by these populations was used as a major climatic factor. Data were analysed using Pearson correlation coefficients, linear regression and partial correlation analyses. The results supported the two hypotheses, thus suggesting that ambient temperature may contribute to the observed differences in the breadth of the cranial base in the studied modern humans.
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September 2011

[Caries of permanent dentition in medieval inhabitants of Wrocław].

Ann Acad Med Stetin 2011 ;57(3):82-7

Katedra i Zakład Stomatologii Zachowawczej i Dzieciecej Akademii Medycznej we Wrocławiu, ul. Krakowska 26, 50-425 Wrocław.

Introduction: The study of dentition plays an important role in the reconstruction of the diet and in assessment of the overall health and living conditions of paleopopulations. The aim of this study was to determine the condition of permanent dentition of medieval inhabitants of Wrocław basing on the prevalence and intensity of caries in permanent dentition.

Material And Methods: The material consisted of 1156 permanent teeth from 118 skulls recovered from two medieval cemeteries in Wrocław: the parish cemetery at the St. Elisabeth Church (13th-14th century) and the cemetery in Ołbin (12th-13th century). Two age classes were formed taking into account anthropologic assessment and group size. The younger class consisted of material up to the age of 35 years; the remaining skulls were assigned to the older class. The prevalence and incidence of caries was determined.

Results: The prevalence and intensity of caries was 56.91% and 15.7%, respectively. Carious lesions predominated in males and in the older age class.

Conclusions: The prevalence and intensity of caries in permanent dentition did not differ from other medieval populations and increased with age. High prevalence of caries reflects a high proportion of carbohydrates in the diet of medieval inhabitants of Wrocław, their high socioeconomic status, and poor oral hygiene.
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March 2013

Physiologic resynchronization therapy: a case of his bundle pacing reversing physiologic conduction in a patient with CHF and LBBB during 2 years of observation.

J Cardiovasc Electrophysiol 2011 Jul 18;22(7):813-7. Epub 2010 Nov 18.

Oddzial Kardiologii, Samodzielny Publiczny Szpital Wojewodzki im Papieza Jana Pawla II w Zamosciu, Al. Jana Pawla 10, Zamosc, Poland.

This is a case of a patient with congestive heart failure and left bundle branch block who was referred for cardiac resynchronization therapy implantation. Instead, a His bundle pacing was achieved with a narrow QRS complex. During 27 months of observation, the patient improved dramatically from NYHA class IV to I. Echo parameters improved significantly the LV diameter from 75/50 to 60/40 mm, EF from 28 to 50%, and mitral regurgitation from 4 to 2°.
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http://dx.doi.org/10.1111/j.1540-8167.2010.01949.xDOI Listing
July 2011

The kinetic and solvent deuterium isotope effects in the 4- and 5-positions of the indole ring on the enzymatic decomposition of L-tryptophan.

Isotopes Environ Health Stud 2010 Jun;46(2):225-32

Department of Chemistry, University of Warsaw, Warsaw, Poland.

The kinetic and solvent deuterium isotope effects in the 4- and 5-positions of the indole ring on the enzymatic decomposition of l-tryptophan catalysed by the enzyme TPase (EC. 4.1.99.1) were determined. The isotope effects were investigated by the non-competitive method using [4'-(2)H]-l-tryptophan, which was enriched in deuterium in 70% in the 4-position. The numerical values of isotope effects for 100% enrichment in deuterated label in that position were calculated by approximation. Those same isotope effects were determined for [5'-(2)H]-l-tryptophan fully deuteriated in the 5' -position.
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http://dx.doi.org/10.1080/10256016.2010.488808DOI Listing
June 2010