280 results on '"Gozdek A"'
Search Results
252. Transformation of an older women under the influence of education at the university of the third age - a case study
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Joanna Wnęk-Gozdek and Jolanta Mackowicz
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Sociology
253. Genomics of staphylococcal Twort-like phages--potential therapeutics of the post-antibiotic era
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Kamil Dąbrowski, Magdalena Witkowska, Sylwia Parasion, Aleksandra Głowacka, Malgorzata Lobocka, Agnieszka Gozdek, Jarosław Kosakowski, Jan Gawor, Helena Kosowska, Monika Hejnowicz, Magdalena Ulatowska, Magdalena Kwiatek, and Beata Weber-Dąbrowska
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Biological Products ,Staphylococcus aureus ,Genes, Viral ,Genome, Viral ,Polymorphism, Single Nucleotide ,Synteny ,Biological Therapy ,Evolution, Molecular ,Mutagenesis, Insertional ,Gene Order ,Staphylococcus epidermidis ,Staphylococcus Phages ,Conserved Sequence ,Sequence Deletion - Abstract
Polyvalent bacteriophages of the genus Twort-like that infect clinically relevant Staphylococcus strains may be among the most promising phages with potential therapeutic applications. They are obligatorily lytic, infect the majority of Staphylococcus strains in clinical strain collections, propagate efficiently and do not transfer foreign DNA by transduction. Comparative genomic analysis of 11 S. aureus/S. epidermidis Twort-like phages, as presented in this chapter, emphasizes their strikingly high similarity and clear divergence from phage Twort of the same genus, which might have evolved in hosts of a different species group. Genetically, these phages form a relatively isolated group, which minimizes the risk of acquiring potentially harmful genes. The order of genes in core parts of their 127 to 140-kb genomes is conserved and resembles that found in related representatives of the Spounavirinae subfamily of myoviruses. Functions of certain conserved genes can be predicted based on their homology to prototypical genes of model spounavirus SPO1. Deletions in the genomes of certain phages mark genes that are dispensable for phage development. Nearly half of the genes of these phages have no known homologues. Unique genes are mostly located near termini of the virion DNA molecule and are expressed early in phage development as implied by analysis of their potential transcriptional signals. Thus, many of them are likely to play a role in host takeover. Single genes encode homologues of bacterial virulence-associated proteins. They were apparently acquired by a common ancestor of these phages by horizontal gene transfer but presumably evolved towards gaining functions that increase phage infectivity for bacteria or facilitate mature phage release. Major differences between the genomes of S. aureus/S. epidermidis Twort-like phages consist of single nucleotide polymorphisms and insertions/deletions of short stretches of nucleotides, single genes, or introns of group I. Although the number and location of introns may vary between particular phages, intron shuffling is unlikely to be a major factor responsible for specificity differences.
254. Macular hole formation and spontaneous closure after vitrectomy for vitreomacular traction documented in spectral-domain optical coherence tomography
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Michael Amon, Dominik Odrobina, Piotr Gozdek, Iwona Laudańska-Olszewska, and Mariusz Maroszyński
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medicine.medical_specialty ,genetic structures ,medicine.medical_treatment ,Remission, Spontaneous ,Retinal perforation ,Vitreomacular traction ,Vitrectomy ,Spontaneous remission ,Case Report ,Vitreous Detachment ,Postoperative Complications ,Optical coherence tomography ,Full-thickness macular hole ,Medicine ,Humans ,Spectral-domain optical coherence tomography ,Macular hole ,Aged ,medicine.diagnostic_test ,business.industry ,Retinal Detachment ,Retinal detachment ,General Medicine ,medicine.disease ,Retinal Perforations ,eye diseases ,Surgery ,Ophthalmology ,surgical procedures, operative ,Female ,sense organs ,business ,Tomography, Optical Coherence - Abstract
Background We present a case of a macular hole formation and its spontaneous closure after vitrectomy for vitreomacular traction. To our knowledge, it is the first description of spontaneous closure of the macular hole after vitrectomy for vitreomacular traction. Case presentation A 78-year-old woman presented decreased visual acuity and metamorphopsia in the right eye due to vitreomacular traction. A vitrectomy with internal limiting membrane peeling and an air tamponade was performed in the right eye. Spectral-domain optical coherence tomography was obtained during all visits. Seven days after the vitrectomy, the spectral-domain optical coherence tomography showed a resolved vitreomacular traction and a full-thickness macular hole. Examination after a further three weeks showed that the full-thickness macular hole had spontaneously closed. 5 months later spectral-domain optical coherence tomography showed a normal foveal contour without intraretinal microcystic spaces and a resolution of the photoreceptor and external limiting membrane elevation. Conclusions While performing a vitrectomy for vitreomacular traction posterior hyaloid membrane creates anterior-posterior traction on the fovea, and, during detachment, retinal layer damage occurs in the macular area and a full-thickness macular hole may develop. Removal of the anterio-posterior vitreous traction may play the main role and may help the spontaneous closure of the macular hole after vitrectomy for vitreomacular traction.
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255. Change of filtration properties of coal flotoconcentrate subjected to the centrifugal filtration after flocculant sonication,Zmiana właściwości filtracyjnych flotokoncentratu węglowego poddanego filtracji wirowej po sonifikacji flokulantu
- Author
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Palica, M., Drzazga, M., Andrzej Gierczycki, Gozdek, A., and Thullie, J.
256. INFORMAL LEARNING IN THE EXPERIENCE OF A POLISH CENTENARIAN - CASE STUDY
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Jolanta Mackowicz and J. Wnek Gozdek
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Mathematics education ,Sociology ,Centenarian ,Informal learning
257. New elastomeric ceramizable composites based on butadiene-acrylonitrile rubber filled with talc.
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Smulski, Kamil, Imiela, Mateusz, Gozdek, Tomasz, and Bieliński, Dariusz M.
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TALC , *ACRYLONITRILE butadiene styrene resins , *RUBBER , *CONSTRUCTION materials , *FIREPROOFING agents , *FIRE prevention - Abstract
One of the most serious drawbacks of polymeric materials is their flammability. This poses problems for their use as building materials. The production of elastomeric composites capable of ceramization is one way of making such materials flame-retardant and thus improving their fire safety. Here, we propose the production of ceramizable, highly filled composites based on NBR rubber containing talc and fluxing agent in the composition. The research showed low flammability (88 % reduction in FIGRA), good rheological properties, high mechanical strength of the vulcanizates (tensile strength at break exceeding 7 MPa) and the ability to produce a strong ceramic phase (up to 77 % increase in required destructive force on ceramizable samples). This confirmed the high flame resistance of the composites tested. In the future, similar composites could be considered for the design of cables that supply fire protection systems, escape route lighting or elevators. • New flame retardant methods for elastomeric composites. • Nitrile-butadiene rubber-based composites capable of ceramization. • Reducing the flammability of polymeric materials. • Talc as a filler for ceramizable composites. [ABSTRACT FROM AUTHOR]
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- 2024
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258. THE SECRET LIFE OF NEW POLYVALENT STAPHYLOCOCCAL PODOVIRUS PMAGO1.3.
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GŁOWACKA-RUTKOWSKA, A., GOZDEK, A., and ŁOBOCKA, M. B.
- Published
- 2018
259. Systematic review and meta-analysis of randomized controlled trials assessing safety and efficacy of posterior pericardial drainage in patients undergoing heart surgery.
- Author
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Gozdek, Mirosław, Pawliszak, Wojciech, Hagner, Wojciech, Zalewski, Paweł, Kowalewski, Janusz, Paparella, Domenico, Carrel, Thierry, Anisimowicz, Lech, and Kowalewski, Mariusz
- Abstract
Objectives To investigate the potential beneficial effects of posterior pericardial drainage in patients undergoing heart surgery. Methods Multiple online databases and relevant congress proceedings were screened for randomized controlled trials assessing the efficacy and safety of posterior pericardial drainage, defined as posterior pericardiotomy incision, chest tube to posterior pericardium, or both. Primary endpoint was in-hospital/30 days' cardiac tamponade. Secondary endpoints comprised death or cardiac arrest, early and late pericardial effusion, postoperative atrial fibrillation (POAF), acute kidney injury, pulmonary complications, and length of hospital stay. Results Nineteen randomized controlled trials that enrolled 3425 patients were included. Posterior pericardial drainage was associated with a significant 90% reduction of the odds of cardiac tamponade compared with the control group: odds ratio (95% confidence interval) 0.13 (0.07-0.25); P < .001. The corresponding event rates were 0.42% versus 4.95%. The odds of early and late pericardial effusion were reduced significantly in the intervention arm: 0.20 (0.11-0.36); P < .001 and 0.05 (0.02-0.10); P < .001, respectively. Posterior pericardial drainage significantly reduced the odds of POAF by 58% ( P < .001) and was associated with significantly shortened (by nearly 1 day) overall length of hospital stay ( P < .001). Reductions in postoperative complications translated into significantly reduced odds of death or cardiac arrest ( P = .03) and numerically lower odds of acute kidney injury ( P = .08). Conclusions Posterior pericardial drainage is safe and simple technique that significantly reduces not only the prevalence of early pericardial effusion and POAF but also late pericardial effusion and cardiac tamponade. These benefits, in turn, translate into improved survival after heart surgery. [ABSTRACT FROM AUTHOR]
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- 2017
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260. Plasma-modified graphene nanoplatelets and multiwalled carbon nanotubes as fillers for advanced rubber composites.
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M Sicinski, T Gozdek, D M Bielinski, H Szymanowski, J Kleczewska, and A Piatkowska
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- 2015
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261. Evaluation of the Selected Mechanical and Aesthetic Properties of Experimental Resin Dental Composites Containing 1-phenyl-1,2 Propanedione or Phenylbis(2,4,6-trimethylbenzoyl)-phosphine Oxide as a Photoinitiator.
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Kowalska-Kuczyńska, Andrea, Sokołowski, Jerzy, Szynkowska-Jóźwik, Małgorzata Iwona, Gozdek, Tomasz, Klajn, Katarzyna, Kopacz, Karolina, and Bociong, Kinga
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DENTAL resins , *DENTAL materials , *VICKERS hardness , *TENSILE strength , *COLORIMETRIC analysis - Abstract
The goal of this study was to compare the mechanical properties of experimental resin dental composites containing a conventional photoinitiating system (camphorquinone CQ and 2-(dimethylami-no)ethyl methacrylate (DMAEMA)) to a photoinitiator system containing 1-phenyl-1,2 propanedione (PPD) with 2-(dimethylami-no)ethyl methacrylate) or acting alone phenylbis(2,4,6-trimethylbenzoyl)-phosphine oxide (BAPO). The manually produced composites consisted of an organic matrix: bis-GMA (60 wt. %), TEGDMA (40 wt. %), and silanized silica filler (45 wt. %). The composites contained 0.4/0.8 wt. %, 0.8/1.6 wt. %, and 1/2 wt. % of PPD/DMAEMA and another group included 0.25, 0.5, or 1 wt. % of BAPO. Vickers hardness, microhardness (in the nanoindentation test), diametral tensile strength, and flexural strength were assessed, and CIE L* a* b* colorimetric analysis was conducted for each composite produced. The highest average Vickers hardness values were obtained for the composite containing 1 wt. % BAPO (43.73 ± 3.52 HV). There was no statistical difference in the results of diametral tensile strength for the experimental composites tested. The results of 3-point bending tests were the highest for composites containing CQ (77.3 ± 8.84 MPa). Despite the higher hardness of experimental composites including PPD or BAPO, compared with composites with CQ, the overall results indicate that the composite with CQ still represents a better solution when used as a photoinitiator system. Moreover, the composites containing PPD and DMAEMA are not promising in terms of color or mechanical properties, especially as they require significantly longer irradiation times. [ABSTRACT FROM AUTHOR]
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- 2023
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262. Improving adhesion between acrylonitrile-butadiene rubber and glass fiber cord by covalent bonding and secondary polar interactions.
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Anyszka, Rafał, Bieliński, Dariusz M., Siciński, Mariusz, Gozdek, Tomasz, Okraska, Michał, Chudzik, Joanna, Imiela, Mateusz, Wręczycki, Jakub, Pietrzak, Dominik, Gralewski, Jacek, and Maciejewska, Magdalena
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NITRILE rubber , *GLASS fibers , *RUBBER , *COVALENT bonds , *ACRYLONITRILE butadiene styrene resins , *SURFACE energy , *METHENAMINE - Abstract
Adhesion promoting systems based on 3-aminopropyltriethoxysilane, 3-mercaptopropyltrimethoxysilane, N-2-aminoethyl-3-aminopropyltrimethoxysilane, hexamethylenetetramine, m-aminophenol, and silica were added into acrylonitrile-butadiene rubber (NBR) compounds to facilitate improved adhesion to a glass fiber cord. The kinetics of sulfur vulcanization, static and dynamic mechanical properties, surface energy, and adhesion to a glass fiber cord of the rubber compounds were studied. The addition of the adhesion promoters significantly influenced compounds' vulcanization, which resulted in significantly changed mechanical properties of the vulcanizates, while the dynamic properties were impacted only slightly. The surface energy measurement results were not in line with the final adhesion test results, which were most likely caused by the effect of acrylonitrile monomer units of NBR orientation toward the bulk of the compound. In consequence, the results indicated a lowering of the surface energy of the samples containing the adhesion promoters, whereas the pull-out test of the glass cord showed a significant improvement of the compounds' adhesion. The most effective adhesion-promoting system consisted of hexamethylenetetramine, m-aminophenol, and silica resulting in an over 300% increase of the adhesion force in comparison to unmodified NBR. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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263. Can TPO as Photoinitiator Replace "Golden Mean" Camphorquinone and Tertiary Amines in Dental Composites? Testing Experimental Composites Containing Different Concentration of Diphenyl(2,4,6-trimethylbenzoyl)phosphine Oxide.
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Kowalska, Andrea, Sokołowski, Jerzy, Szynkowska-Jóźwik, Małgorzata Iwona, Gozdek, Tomasz, Kopacz, Karolina, and Bociong, Kinga
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DENTAL materials , *MODERATION , *PHOSPHINE oxides , *TERTIARY amines , *TENSILE strength , *DENTAL glass ionomer cements - Abstract
The aim of this research was to compare the biomechanical properties of experimental composites containing a classic photoinitiating system (camphorquinone and 2-(dimethylami-no)ethyl methacrylate) or diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide (TPO) as a photoinitiator. The produced light-cured composites consisted of an organic matrix-Bis-GMA (60 wt.%), TEGDMA (40 wt.%) and silanized silica filler (45 wt.%). Composites contained 0.27; 0.5; 0.75 or 1 wt.% TPO. Vickers hardness, microhardness (in the nanoindentation test), diametral tensile strength, resistance to three-point bending and the CIE L* a* b* colorimetric analysis was performed with each composite produced. The highest average Vickers hardness values were obtained for the composite containing 1 wt.% TPO (43.18 ± 1.7HV). The diametral tensile strength remains on regardless of the type and amount of photoinitiator statistically the same level, except for the composite containing 0.5 wt.% TPO for which DTS = 22.70 ± 4.7 MPa and is the lowest recorded value. The highest average diametral tensile strength was obtained for the composite containing 0.75 wt.% TPO (29.73 ± 4.8 MPa). The highest modulus of elasticity characterized the composite containing 0.75 wt.% TPO (5383.33 ± 1067.1 MPa). Composite containing 0.75 wt.% TPO has optimal results in terms of Vickers hardness, diametral tensile strength, flexural strength and modulus of elasticity. Moreover, these results are better than the parameters characterizing the composite containing the CQ/DMAEMA system. In terms of an aesthetic composite containing 0.75 wt.%. TPO is less yellow in color than the composite containing CQ/DMAEMA. This conclusion was objectively confirmed by test CIE L* a* b*. [ABSTRACT FROM AUTHOR]
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- 2022
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264. Response of body size and developmental time of Tribolium castaneum to constant versus fluctuating thermal conditions.
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Małek, D., Drobniak, S., Gozdek, A., Pawlik, K., and Kramarz, P.
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BODY size , *RED flour beetle , *COLD-blooded animals , *EFFECT of temperature on insects , *LIFE history theory , *BODY mass index - Abstract
Temperature has profound effects on biological functions at all levels of organization. In ectotherms, body size is usually negatively correlated with ambient temperature during development, a phenomenon known as The Temperature-Size Rule (TSR). However, a growing number of studies have indicated that temperature fluctuations have a large influence on life history traits and the implications of such fluctuations for the TSR are unknown. Our study investigated the effect of different constant and fluctuating temperatures on the body mass and development time of red flour beetles ( Tribolium castaneum Herbst, 1797); we also examined whether the sexes differed in their responses to thermal conditions. We exposed the progeny of half-sib families of a T. castaneum laboratory strain to one of four temperature regimes: constant 30 °C, constant 25 °C, fluctuating with a daily mean of 30 °C, or fluctuating with a daily mean of 25 °C. Sex-specific development time and body mass at emergence were determined. Beetles developed the fastest and had the greatest body mass upon emergence when they were exposed to a constant temperature of 30 °C. This pattern was reversed when beetles experienced a constant temperature of 25 °C: slowest development and lowest body mass upon emergence were observed. Fluctuations changed those effects significantly – impact of temperature on development time was smaller, while differences in body mass disappeared completely. Our results do not fit TSR predictions. Furthermore, regardless of the temperature regime, females acquired more mass, while there were no differences between sexes in development time to eclosion. This finding fails to support one of the explanations for smaller male size: that selection favors the early emergence of males. We found no evidence of genotype × environment interactions for selected set of traits. [ABSTRACT FROM AUTHOR]
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- 2015
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265. Fly Ash from Lignite Combustion as a Filler for Rubber Mixes—Part II: Chemical Valorisation of Fly Ash.
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Orczykowski, Wojciech, Bieliński, Dariusz M., Anyszka, Rafał, Gozdek, Tomasz, Klajn, Katarzyna, Celichowski, Grzegorz, Pędzich, Zbigniew, and Wojteczko, Agnieszka
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FLY ash , *LIGNITE combustion , *RUBBER , *STYRENE-butadiene rubber , *SILANE , *VINYLSILANES , *POLYSULFIDES , *THIOLS - Abstract
Fly ash (FA) fractions with a particle size of 63 µm < FA < 250 µm obtained by sieve fractionation were used as a partial carbon black (CB) replacement in a rubber mixture based on styrene-butadiene rubber (SBR). In order to improve the interactions at the interface between rubber and fractionated ash, at the stage of preparing the rubber mixtures, two different vinyl silanes were added to the system: Vinyltrimethoxysilane (U-611) or Vinyl-tris (2-methoxy-ethoxy) silane (LUVOMAXX VTMOEO DL50), silane with epoxy groups: 3-(glycidoxypropyl)trimethoxysilane (U-50) or sulfur functionalized silanes: containing sulfide bridges: Bis(triethoxysilylpropyl)polysulfide silane (Si-266) or mercapto groups: Mercaptopropyltrimethoxysilane (Dynaslan MTMO). The conducted research confirmed the effectiveness of silanization with selected functional silanes, from the point of view of improving the processing and operational properties of vulcanizates, in which CB is partially replaced with the finest fractions of fly ash. The silanization generally increased the interaction at the rubber–ash interface, while improving the degree of filler dispersion in the rubber mixture. The results of TGA and FTIR analyses confirmed the presence of silanes chemically bonded to the surface of fly ash particles. SEM tests and determination of the bound rubber (BdR) content show that the introduction of the silanes to the mixture increases the degree of ash dispersion (DI) and the Payne effect, which is the greatest when mercaptosilane was used for modification. The highest increase in torque, which was recorded in the case of rubber mixtures containing sulfur silanes and silane with epoxy groups, may be due to their participation in the vulcanization process, which is confirmed by the results of vulcametric studies. The lowest values of mechanical strength, elongation at break, and the highest hardness of vulcanizates obtained in this case may be the result of the over-crosslinking of the rubber. The addition of sulfur-containing silanes significantly slowed down the vulcanization process, which is particularly visible (up to three times extension of the t90 parameter, compared to mixtures without silane) in the case of Si-266. The addition of silanes, except for Si-266 (with a polysulfide fragment), generally improved the abrasion resistance of vulcanizates. The Dynaslan MTMO silane (with mercapto groups) performs best in this respect. Proper selection of silane for the finest fraction of fly ash in the rubber mixtures tested allows for an increase in the mechanical strength of their vulcanizates from 9.1 to 17 MPa, elongation at break from 290 to 500%, hardness from 68 to 74 °ShA, and reduction in abrasion from 171 to 147 mm3. [ABSTRACT FROM AUTHOR]
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- 2022
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266. Control strategy of the hybrid drive for vehicle mounted aerial work platform
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Krasucki, Janusz, Rostkowski, Andrzej, Gozdek, Łukasz, and Bartyś, Michał
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CONTROL theory (Engineering) , *AUTOMATIC control systems , *CONSTRUCTION equipment , *FUZZY logic , *STORAGE batteries , *SIMULATION methods & models , *CONSTRUCTION industry automation - Abstract
Abstract: The development process i.e. assumptions, construction, simulations and analysis of a control strategy for the hybrid drive of the vehicle mounted aerial work platform is presented in the paper. Particular attention is paid to the development of the control system strategy ensuring appropriate energy recuperation by making use of energy stored in the electrochemical form. The control strategy is built up around the concept of bi-level hierarchic control system. The elevation control of the aerial work platform is assumed as the primary goal of the control system. The secondary goal of the control system is formulated in terms of tracking and keeping the charging level of the rechargeable electrochemical accumulator in predefined limits. A control system simulation model is developed in Matlab-Simulink environment. Exemplary results of control system simulations are shown on the example of a hydraulic power unit driving aerial work platform mounted on special vehicle MONTRAKS. [Copyright &y& Elsevier]
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- 2009
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267. Digital inclusion from the perspective of teachers of older adults - expectations, experiences, challenges and supporting measures.
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Tomczyk, Łukasz, Mróz, Anna, Potyrała, Katarzyna, and Wnęk-Gozdek, Joanna
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OCCUPATIONAL roles , *DIGITAL divide , *SOCIAL support , *NONPROFIT organizations , *ACADEMIC medical centers , *DIGITAL technology , *LIFE expectancy , *RESEARCH methodology , *COLLEGE teacher attitudes , *INTERVIEWING , *QUALITATIVE research , *NURSING care facilities , *HUMAN services programs , *EDUCATORS , *COMMUNITY-based social services , *NEEDS assessment , *SOCIAL integration , *PUBLIC libraries , *COMPUTER literacy , *INFORMATION technology , *OLD age ,RESEARCH evaluation - Abstract
The goal of the study was to diagnose the needs of instructors working in the area of the digital inclusion of persons who are excluded, at risk of exclusion, marginalized, and discriminated against in terms of using new technologies. The research focused on the phenomenon of the digital divide as seen from the perspective of digital literacy educators of older adults. The study was conducted in 2019 in Poland, using a qualitative research methodology (a structured in-depth interview) and interpretative paradigm. The respondents were 8 specialists, educators of older adults, representing different types of institutions dealing with the digital divide: a activity center, a public library, a nursing home, an NGO, and a University of the Third Age. Triangulation of the results led to several important conclusions regarding to the expectations, experiences, challenges and postulated supporting actions related to digital inclusion. Based on the results gathered, we have noticed that educators readily share their didactic and organizational experience. The respondents were open to the development of their own teaching competences, and recognized the role of lifelong learning. They often highlighted that the digital education of older adults is only one of many additional activities. The activities to improve the digital literacy of older adults are implemented as part of their non-formal education (i.e. it is carried out by educators holding no formal qualifications). For this reason, the teachers expect content-related and methodological support most of all, as well as the promotion of the idea of lifelong education (including digital literacy development) in society. [ABSTRACT FROM AUTHOR]
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- 2022
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268. The Influence of Various Photoinitiators on the Properties of Commercial Dental Composites.
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Kowalska, Andrea, Sokolowski, Jerzy, Gozdek, Tomasz, Krasowski, Michał, Kopacz, Karolina, and Bociong, Kinga
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COMMERCIAL real estate , *STRAINS & stresses (Mechanics) , *DENTAL materials , *FLEXURAL strength , *MICROHARDNESS , *TENSILE strength - Abstract
The aim of this article was to compare the biomechanical properties of commercial composites containing different photoinitiators: Filtek Ultimate (3M ESPE) containing camphorquinone (CQ); Estelite Σ Quick (Tokuyama Dental) with CQ in RAP Technology®; Tetric EvoCeram Bleach BLXL (Ivoclar Vivadent AG) with CQ and Lucirin TPO; and Tetric Evoceram Powerfill IVB (Ivoclar Vivadent AG) with CQ and Ivocerin TPO. All samples were cured with a polywave Valo Lamp (Ultradent Products Inc.) with 1450 mW/cm2. The microhardness, hardness by Vicker's method, diametral tensile strength, flexural strength and contraction stress with photoelastic analysis were tested. The highest hardness and microhardness were observed for Filtek Ultimate (93.82 ± 17.44 HV), but other composites also displayed sufficient values (from 52 ± 3.92 to 58,82 ± 7.33 HV). Filtek Ultimate not only demonstrated the highest DTS (48.03 ± 5.97 MPa) and FS (87.32 ± 19.03 MPa) but also the highest contraction stress (13.7 ± 0.4 MPa) during polymerization. The TetricEvoCeram Powerfill has optimal microhardness (54.27 ± 4.1 HV), DTS (32.5 ± 5.29 MPa) and FS (79.3 ± 14.37 MPa) and the lowest contraction stress (7.4 ± 1 MPa) during photopolymerization. To summarize, Filtek Ultimate demonstrated the highest microhardness, FS and DTS values; however, composites with additional photoinitiators such as Lucirin TPO and Ivocerin have the lowest polymerization shrinkage. These composites also have higher FS and DTS and microhardness than material containing CQ in Rap Technology. [ABSTRACT FROM AUTHOR]
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- 2021
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269. Linkages between Energy Delivery and Economic Growth from the Point of View of Sustainable Development and Seaports.
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Szaruga, Elżbieta, Kłos-Adamkiewicz, Zuzanna, Gozdek, Agnieszka, and Załoga, Elżbieta
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ECONOMIC expansion , *BUSINESS cycles , *SUSTAINABLE development , *HARBORS , *PETROLEUM , *AIR filters - Abstract
This paper presents the synchronisation of economic cycles of GDP and crude oil and oil products cargo volumes in major Polish seaports. On the one hand, this issue fits into the concept of sustainable development including decoupling; on the other hand, the synchronisation may be an early warning tool. Crude oil and oil products cargo volumes are a specific barometer that predicts the next economic cycle, especially as they are primary sources of energy production. The research study applies a number of TRAMO/SEATS methods, the Hodrick–Prescott filter, spectral analysis, correlation and cross-correlation function. Noteworthy is the modern approach of using synchronisation of economic cycles as a tool, which was described in the paper. According to the study results, the cyclical components of the cargo traffic and GDP were affected by the leakage of other short-term cycles. However, based on the cross-correlation, it was proved that changes in crude oil and oil products cargo volumes preceded changes in GDP by 1–3 quarters, which may be valuable information for decision-makers and economic development planners. [ABSTRACT FROM AUTHOR]
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- 2021
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270. Influence of n-ZnO Morphology on Sulfur Crosslinking and Properties of Styrene-Butadiene Rubber Vulcanizates.
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Bieliński, Dariusz M., Klajn, Katarzyna, Gozdek, Tomasz, Kruszyński, Rafał, and Świątkowski, Marcin
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STYRENE-butadiene rubber , *PARTICLE size distribution , *VULCANIZATION , *ACTIVATION energy , *ZINC oxide , *SULFUR - Abstract
This paper examines the influence of the morphology of zinc oxide nanoparticles (n-ZnO) on the activation energy, vulcanization parameters, crosslink density, crosslink structure, and mechanical properties in the extension of the sulfur vulcanizates of styrene-butadiene rubber (SBR). Scanning electron microscopy was used to determine the particle size distribution and morphology, whereas the specific surface area (SSA) and squalene wettability of the n-ZnO nanoparticles were adequately evaluated using the Brunauer–Emmet–Teller (BET) equation and tensiometry. The n-ZnO were then added to the SBR in conventional (CV) or efficient (EV) vulcanization systems. The vulcametric curves were plotted, from which the cure rate index (CRI) rate of the vulcanization and the activation energy were calculated. The influence on the mechanical properties of the SBR vulcanizates was stronger in the case of the EV curing system than when the CV curing system was used. Of the vulcanizates produced in the EV curing system, the best performance was detected for n-ZnO particles with a hybrid morphology (flat-ended rod-like particles on a "cauliflower" base) and high SSA. Vulcanizates produced using the CV curing system showed slightly better mechanical properties after the addition of nanoparticles with a "cauliflower" morphology than when the rod-like type were used, irrespective of their SSA. In general, nanoparticles with a rod-like structure reduced the activation energy and increased the speed of vulcanization, whereas the cauliflower type slowed the rate of the process and the vulcanizates required a higher activation energy, especially when using the EV system. The crosslink structures were also more clearly modified, as manifested by a reduction in the polysulfidic crosslink content, especially when n-ZnO activators with a rod-like morphology were applied. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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271. Low-temperature plasma modification of carbon nanofillers for improved performance of advanced rubber composites.
- Author
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Siciński, Mariusz, Bieliński, Dariusz M., Szymanowski, Hieronim, Gozdek, Tomasz, and Piątkowska, Anna
- Subjects
- *
STYRENE-butadiene rubber , *SILANE , *SECONDARY ion mass spectrometry , *MULTIWALLED carbon nanotubes , *MECHANICAL behavior of materials , *X-ray photoelectron spectroscopy , *ELECTRON spectroscopy - Abstract
In modern polymer industry, there still is a room for new generations of fillers capable of enhancing the performance of composite materials. Currently, much effort is being put into a process of improving mechanical properties of elastomer materials. In this work, multiwalled carbon nanotubes (MWCNTs) and graphene nanoplatelets (GnPs) were modified with silane, titanate, or zirconate using plasma treatment, in order to apply them as fillers for styrene/butadiene rubber. Following its modification, filler surface was analyzed: Surface free energy (SFE) was measured with tensiometry, and micromorphology and chemical composition were studied with scanning electron microscopy–energy-dispersive spectroscopy (SEM–EDS), while elemental composition and bonding were assessed with X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS). Low-temperature oxygen plasma activation of MWCNT fillers leads to a significant increase in the SFE polar component, with the same effect being much weaker for GnP fillers. Grafting silanes, zirconates, and titanates on activated filler surface results in a decrease in SFE polar component—surface oxygen-containing active groups react with silane/zirconate/titanate molecules. Fillers modified in this way exhibit different micromorphology and surface chemical composition what is revealed with the SEM–EDS, ToF-SIMS, and XPS techniques. As the ultimate step, either MWCNT or GnP rubber nanocomposites were manufactured using the modified fillers with their mechanical properties and cross-link density being studied. Filler modification resulted in substantial changes both in composite performance, and in its cross-linking density. In the case of modified filler containing composites, improved tensile strength and elongation at break were observed. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
272. Effect of mineral filler additives on flammability, processing and use of silicone-based ceramifiable composites.
- Author
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Anyszka, Rafał, Bieliński, Dariusz M., Pędzich, Zbigniew, Parys, Grzegorz, Rybiński, Przemysław, Zarzecka-Napierała, Magdalena, Imiela, Mateusz, Gozdek, Tomasz, Siciński, Mariusz, Okraska, Michał, Ziąbka, Magdalena, and Szumera, Magdalena
- Subjects
- *
MINERALS , *FLAMMABILITY , *SILICON , *CALCIUM silicates , *WOLLASTONITE - Abstract
The aim of this work is to describe the changes in the properties of ceramifiable silicone rubber-based composites caused by the incorporation of novel alternative minerals in comparison to other popular, widely utilized fillers. TiO2, calcined kaolin and calcium-based minerals mix (CbMix) consisting of CaO (6.26 wt%), CaCO3 (26.18 wt%) and Ca(OH)2 (67.56 wt%) have not been considered as a dispersed phase of ceramifiable silicone composites destined for wire covers yet. Mineral fillers: TiO2 (anatase), mica (phlogopite), CbMix, CaCO3, Al(OH)3, kaolin and calcined kaolin affect the processing and the various properties of silicone rubber-based composites destined for wire covers differently. The properties—flammability, smoke intensity, micromorphology and mechanical durability after ceramification—are assessed by measuring: the kinetics of vulcanization, stress at different levels of elongation, tensile strength and the elongation at break of the materials. Although the curing process of the composites is disturbed by the addition of CbMix, it benefits from an increase in oxygen index value, which reaches 31.4%. What is more, also its flammability parameters measured by cone calorimetry improve, such as the total heat released (THR) reaching 9.3 MJ/m2. Samples containing kaolin and calcined kaolin exhibit the best mechanical properties before ceramification, whereas composites filled with calcium-based powders (CbMix, CaCO3) mechanically display the strongest mineral char after heat treatment, possibly due to a more homogenous micromorphology and the creation of calcium silicates at elevated temperature. Significant amounts of wollastonite, parawollastonite and pseudowollastonite are visible in their structure after ceramification. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
273. Effect of modified graphene and carbon nanotubes on the thermal properties and flammability of elastomeric materials.
- Author
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Rybiński, Przemysław, Anyszka, Rafał, Imiela, Mateusz, Siciński, Mariusz, and Gozdek, Tomasz
- Subjects
- *
GRAPHENE , *FLAMMABILITY , *ELASTOMERS , *THERMOPHYSICAL properties , *MULTIWALLED carbon nanotubes , *STYRENE-butadiene rubber - Abstract
The paper presents the test results of the effect of modified graphene and multi-wall carbon nanotubes on the thermal and mechanical properties and flammability of acrylic rubber and styrene-butadiene rubber. The rubbers were cross-linked with the use of organic peroxide. Based on the test results obtained by optic and AFM methods, a relationship between the surface morphology of the nanocomposites obtained was presented. By means of thermal analysis methods (TG, DTG, DTA) and a micro-calorimeter, it has been found that the nanofillers used considerably increase the thermal stability and decrease flammability of the nanocomposites. The mechanical properties of the elastomeric materials obtained depend on the type and content of nanofiller. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
274. Bitumen Binders Modified with Sulfur/Organic Copolymers.
- Author
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Wręczycki, Jakub, Demchuk, Yuriy, Bieliński, Dariusz M., Bratychak, Michael, Gunka, Volodymyr, Anyszka, Rafał, and Gozdek, Tomasz
- Subjects
- *
BITUMEN , *POLYSULFIDES , *SULFUR , *COPOLYMERS , *FOURIER transform infrared spectroscopy , *PETROLEUM production - Abstract
With the continuing growth of waste sulfur production from the petroleum industry processes, its utilization for the production of useful, low-cost, and environmentally beneficial materials is of primary interest. Elemental sulfur has a significant and established history in the modification of bitumen binders, while the sulfur-containing high-molecular compounds are limited in this field. Herein, we report a novel possibility to utilize the sulfur/organic copolymers obtained via the inverse vulcanization process as modifiers for bitumen binders. Synthesis and thermal characterization (TGA-DSC) of polysulfides derived from elemental sulfur (S8) and unsaturated organic species (dicyclopentadiene, styrene, and limonene) have been carried out. The performance of modified bitumen binders has been studied by several mechanical measurements (softening point, ductility, penetration at 25 °C, frass breaking point, adhesion to glass and gravel) and compared to the unmodified bitumen from the perspective of normalized requirements concerning polymer-modified bitumen. The interaction of bitumen binder with sulfur/organic modifier has been studied by means of FTIR spectroscopy and DSC measurements. The impact of the modification on the performance properties of bitumen has been demonstrated. The bitumen binders modified with sulfur/organic copolymers are in general less sensitive to higher temperatures (higher softening point up to 7 °C), more resistant to permanent deformations (lower penetration depth), and more resistant to aging processes without intrusive deterioration of parameters at lower temperatures. What is more, the modification resulted in significantly higher adhesion of bitumen binders to both glass (from 25% up to 87%) and gravel surfaces in combination with a lower tendency to form permanent deformations (more elastic behavior of the modified materials). [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
275. ICT for Learning and Inclusion in Latin America and Europe. Case Study From Countries: Bolivia, Brazil, Cuba, Dominican Republic, Ecuador, Finland, Poland, Turkey, Uruguay
- Author
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Tomczyk, Łukasz, Sunday Oyelere, Solomon, Costas Jáuregui, Vladimir, Amato, Cibelle Albuquerque de La Higuera, Silveira, Ismar Frango, Eliseo, Maria Amelia, Martins, Valéria Farinazzo, Santana Botana, Lourdes Miriam, Andreu Gómez, Nancy, Bilbao Consuegra, Maida Librada, Martínez Consuegra, Juan Gustavo, Palacios Morales, Carlos Javier, González Peña, Raúl, Llópiz Guerra, Karel, Muñoz, Darwin, Puentes, Ángel, Sánchez-Castillo, Gloria, Rosa Feliz, Cinthia de la, Barros, Maria-Jose, Barros-Gavilanes, Gabriel, Bouali, Nacir, Agbo, Friday Joseph, Suhonen, Jarkko, Wnęk-Gozdek, Joanna, Mróz, Anna, Wojewodzic, Krzysztof, Yaşar Akyar, Özgür, Yüksel, Yılmaz, Bilgin, Emre, Şimşek, Burcu, Demirhan, Gıyasettin, Motz, Regina, Porta Galván, Mariana, Díaz Charquero, Patricia, and Da Cunha, Heber
- Subjects
América Latina ,Inclusión digital ,aprendizaje ,Nuevas tecnologías ,Europa - Abstract
We are presenting a unique research report dedicated to the use of digital media in education and digital inclusion. It is unique because of the countries which contributed to this monograph showing the common challenges and differences present in the selected regions of Latin America and Europe. The monograph is the result of a systemic document analysis in: Bolivia, Brazil, Cuba, the Dominican Republic, Ecuador, Finland, Poland, Turkey and Uruguay. It is the effect of participation of representatives of selected universities in the project “Smart Ecosystem for Learning and Inclusion” - ERANet17/ICT-0076 SELI, the aim of which is to: identify the challenges in the use of ICT as a tool for learning and inclusion; initiate broad stakeholder dialogue and consultation to screen potential educational, technical and business solutions for the challenges; implement knowledge transfer of tested and effective solutions rooted within the media pedagogy paradigm of opportunities and create an education platform with tools to support work with disadvantaged individuals and groups such as migrants, the elderly, the physically challenged, and the deaf and dumb. This book is a milestone for the analyses of the existing documentation, conducted by the representatives of nine academic centres. The results presented herein refer to the results of investigations into the key areas of digitally supported education and activities facilitating social inclusion and its subcategory – digital inclusion. Every chapter presents the general contexts of using the ICTs in education in the perspective of the development of the society saturated with the Internet and digital devices – the new media. Authors of the individual texts try to emphasise the meaning of digital literacy and data reflecting the level of digital gap, as well as the challenges faced by the selected European, Latin American and Caribbean (the Dominican Republic) countries. They also refer to the local, regional and governmental social policies, presenting the contexts – and good practices – in which preparation of teachers to use ICT, the process of reducing the digital divide and improving digital literacy take place. An important element of the work was to outline the issues relating to the educational innovation like: blockchain, digital storytelling, flipped learning, personalised learning or sharing pedagogy. The publication is an overview, however, the texts are the attempts to diagnose and determine the role of the certain actors responsible for the process of successful digital inclusion and implementation of innovative ICT-based solutions into the formal and informal education. The selected chapters also form a catalogue of good practices implemented in the certain countries. Such point of view may prove particularly useful for further research in the field of comparative pedagogy, media in education, adult education or social policies. We hope that this theoretical compilation will provide a valuable perspective for exchanging learning experiences through the transfer of the best solutions and presentation of the challenges faced by the countries participating in the SELI project. Bolivia: Ministerio de Educación – Vice Ministerio de Ciencia y Tecnología, MINEDU Brazil: Fundação de Amparo à Pesquisa do Estado de São Paulo, FAPESP Dominican Republic: Ministerio de Educación Superior, Ciencia y Tecnología, MESCyT Ecuador: Secretaría de Educación Superior, Ciencia, Tecnología e Innovación, SENESCYT Finland: Academy of Finland, AKA, Research Council for Culture and Society Poland: Narodowe Centrum Badań i Rozwoju, NCBiR Turkey: Turkiye Bilimsel vê Teknolojik Arastirma Kurumu, TUBITAK Uruguay: Agencia Nacional de Investigación e Innovación, ANII Introduction Vladimir Costas Jáuregui ICT in Education: The situation of Bolivia Cibelle Albuquerque de La Higuera Amato Ismar Frango Silveira Maria Amelia Eliseo Valéria Farinazzo Martins ICT in Education fostering Inclusion – The Brazilian context Lourdes Miriam Santana Botana Nancy Andreu Gómez Maida Librada Bilbao Consuegra Juan Gustavo Martínez Consuegra Carlos Javier Palacios Morales Raúl González Peña Karel Llópiz Guerra Digital inclusion in Cuba. Challenges and experiences Darwin Muñoz Ángel Puentes Gloria Sánchez-Castillo Cinthia de la Rosa Feliz ICT in Education: The situation of Dominican Republic Maria-Jose Barros Gabriel Barros-Gavilanes Digital literacy and ICT in learning and inclusion - Ecuador Solomon Sunday Oyelere Nacir Bouali Friday Joseph Agbo Jarkko Suhonen ICT for learning and inclusion in Finland Łukasz Tomczyk Joanna Wnęk-Gozdek Anna Mróz Krzysztof Wojewodzic ICT, digital literacy, digital inclusion and media education in Poland Özgür Yaşar Akyar Yılmaz Yüksel Emre Bilgin Burcu Şimşek Gıyasettin Demirhan ICT in learning and inclusion – Turkey Regina Motz Mariana Porta Galván Patricia Díaz Charquero Heber Da Cunha Digital inclusion, ICT in education in Uruguay
- Published
- 2019
276. Arabidopsis thaliana NudiXes have RNA-decapping activity.
- Author
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Mititelu MB, Hudeček O, Gozdek A, Benoni R, Nešuta O, Krasnodębski S, Kufel J, and Cahová H
- Abstract
Recent discoveries of various noncanonical RNA caps, such as dinucleoside polyphosphates (Np
n N), coenzyme A (CoA), and nicotinamide adenine dinucleotide (NAD) in all domains of life have led to a revision of views on RNA cap function and metabolism. Enzymes from the NudiX family capable of hydrolyzing a polyphosphate backbone attached to a nucleoside are the strongest candidates for degradation of noncanonically capped RNA. The model plant organism Arabidopsis thaliana encodes as many as 28 NudiX enzymes. For most of them, only in vitro substrates in the form of small molecules are known. In our study, we focused on four A. thaliana NudiX enzymes (AtNUDT6, AtNUDT7, AtNUDT19 and AtNUDT27), and we studied whether these enzymes can cleave RNA capped with Npn Ns (Ap2-5 A, Gp3-4 G, Ap3-5 G, m7 Gp3 G, m7 Gp3 A), CoA, ADP-ribose, or NAD(H). While AtNUDT19 preferred NADH-RNA over other types of capped RNA, AtNUDT6 and AtNUDT7 preferentially cleaved Ap4 A-RNA. The most powerful decapping enzyme was AtNUDT27, which cleaved almost all types of capped RNA at a tenfold lower concentration than the other enzymes. We also compared cleavage efficiency of each enzyme on free small molecules with RNA capped with corresponding molecules. We found that AtNUDT6 prefers free Ap4 A, while AtNUDT7 preferentially cleaved Ap4 A-RNA. These findings show that NudiX enzymes may act as RNA-decapping enzymes in A. thaliana and that other noncanonical RNA caps such as Ap4 A and NADH should be searched for in plant RNA., Competing Interests: Authors declare no conflicts of interests., (This journal is © The Royal Society of Chemistry.)- Published
- 2023
- Full Text
- View/download PDF
277. Correction to 'A novel 5'-hydroxyl dinucleotide hydrolase activity for the DXO/Rai1 family of enzymes'.
- Author
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Doamekpor SK, Gozdek A, Kwasnik A, Kufel J, and Tong L
- Published
- 2021
- Full Text
- View/download PDF
278. Genomics of staphylococcal Twort-like phages--potential therapeutics of the post-antibiotic era.
- Author
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Łobocka M, Hejnowicz MS, Dąbrowski K, Gozdek A, Kosakowski J, Witkowska M, Ulatowska MI, Weber-Dąbrowska B, Kwiatek M, Parasion S, Gawor J, Kosowska H, and Głowacka A
- Subjects
- Biological Products pharmacology, Conserved Sequence, Evolution, Molecular, Gene Order, Genes, Viral, Genome, Viral, Mutagenesis, Insertional, Polymorphism, Single Nucleotide, Sequence Deletion, Staphylococcus Phages growth & development, Staphylococcus aureus virology, Staphylococcus epidermidis virology, Synteny, Biological Therapy methods, Staphylococcus Phages genetics
- Abstract
Polyvalent bacteriophages of the genus Twort-like that infect clinically relevant Staphylococcus strains may be among the most promising phages with potential therapeutic applications. They are obligatorily lytic, infect the majority of Staphylococcus strains in clinical strain collections, propagate efficiently and do not transfer foreign DNA by transduction. Comparative genomic analysis of 11 S. aureus/S. epidermidis Twort-like phages, as presented in this chapter, emphasizes their strikingly high similarity and clear divergence from phage Twort of the same genus, which might have evolved in hosts of a different species group. Genetically, these phages form a relatively isolated group, which minimizes the risk of acquiring potentially harmful genes. The order of genes in core parts of their 127 to 140-kb genomes is conserved and resembles that found in related representatives of the Spounavirinae subfamily of myoviruses. Functions of certain conserved genes can be predicted based on their homology to prototypical genes of model spounavirus SPO1. Deletions in the genomes of certain phages mark genes that are dispensable for phage development. Nearly half of the genes of these phages have no known homologues. Unique genes are mostly located near termini of the virion DNA molecule and are expressed early in phage development as implied by analysis of their potential transcriptional signals. Thus, many of them are likely to play a role in host takeover. Single genes encode homologues of bacterial virulence-associated proteins. They were apparently acquired by a common ancestor of these phages by horizontal gene transfer but presumably evolved towards gaining functions that increase phage infectivity for bacteria or facilitate mature phage release. Major differences between the genomes of S. aureus/S. epidermidis Twort-like phages consist of single nucleotide polymorphisms and insertions/deletions of short stretches of nucleotides, single genes, or introns of group I. Although the number and location of introns may vary between particular phages, intron shuffling is unlikely to be a major factor responsible for specificity differences., (Copyright © 2012 Elsevier Inc. All rights reserved.)
- Published
- 2012
- Full Text
- View/download PDF
279. [Enteropathic acrodermatitis in light of personal observations].
- Author
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Rosińska-Borkowska D and Chrupek-Gozdek A
- Subjects
- Acrodermatitis blood, Child, Child, Preschool, Female, Humans, Infant, Male, Zinc blood, Zinc Sulfate, Acrodermatitis drug therapy, Sulfates therapeutic use, Zinc therapeutic use
- Abstract
Observations are reported carried out on the course and treatment of enteropathic acrodermatitis in 14 children. In the children the characteristic clinical picture before treatment was associated with low serum zinc level. Determination of serum zinc level during the treatment with zinc sulphate is without decisive importance for the selection of maintenance doses and the drug must be taken often during many years. In the choice of the therapeutic dose the clinical effects should be taken into account, and the dose may not be so high that it would normalized serum zinc level.
- Published
- 1990
280. [Case of Weber, Thieberge and Weissenbach syndrome].
- Author
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Wysocka K, Daniel B, Gozdek A, and Kiczak J
- Subjects
- Female, Humans, Middle Aged, Skin Diseases diagnosis, Syndrome, Calcinosis diagnosis, Scleroderma, Systemic diagnosis
- Published
- 1979
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