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Wyświetlanie 1-7 z 7
Tytuł:
Cyber Security of Electrical Grids – A Contribution to Research
Autorzy:
Włodyka, Ewa Maria
Kaczmarek, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/31342016.pdf
Data publikacji:
2024-05-20
Wydawca:
Akademia Sztuki Wojennej
Tematy:
electrical grids
public administration
cyber security
critical infrastructure
Opis:
The state’s critical infrastructure involves those elements that function independently yet are interconnected. It is also affected by ICT networks that exist in other states. These interdependencies make critical infrastructure particularly vulnerable to cyber attacks. At the same time, it is electrical grids that constitute the most crucial element of critical infrastructure. The research hypothesis assumes an urgent need to comprehensively address the cyber security policy of electrical grids in a broader perspective, not only the technical one but also taking into account public policies and the human factor. Quantitative and qualitative methods, literature survey and the desk research method were employed in order to verify this hypothesis. The analyses carried out by the Authors indicated unequivocally that electrical grids constitute an element of the critical infrastructure that is the most vulnerable to cyber threats.
Źródło:
Cybersecurity and Law; 2024, 12, 2; 260-272
2658-1493
Pojawia się w:
Cybersecurity and Law
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mediating role of coping styles in the relationship between anxiety and health behaviors of obese adolescents
Autorzy:
Ziarko, Michał
Kaczmarek, Łukasz D.
Mojs, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/430670.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
coping
obesity
anxiety
health behaviors
Opis:
Obesity is one of the major health problems in adolescents. Health-detrimental lifestyle (i.e. lack of physical activity, inappropriate nutrition) as well as maladaptive styles of coping with stress are regarded as belonging among determinants of obesity. The aim of the study was to establish factors mediating between anxiety and diet-related health behaviors. Participants in the study were 113 adolescents with obesity whose body weight was over 97th centile. They were examined using a set of self-report questionnaires to measure anxiety, coping styles and health behaviors. Emotion-focused coping and seeking social contacts (social diversion) were found to act as mediators between adolescents’ trait anxiety and their health behaviors. The findings suggest that to enhance obese adolescents’ health-promoting behaviors appropriate conditions should be ensured that would not only enable them to express their emotions, but also promote their socializing with peers.
Źródło:
Polish Psychological Bulletin; 2012, 43, 2; 145-150
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics and biological properties of ferulic acid
Autorzy:
Dędek, Kamil
Rosicka-Kaczmarek, Justyna
Nebesny, Ewa
Kowalska, Gabriela
Powiązania:
https://bibliotekanauki.pl/articles/410448.pdf
Data publikacji:
2019
Wydawca:
Politechnika Łódzka. Wydawnictwo Politechniki Łódzkiej
Tematy:
ferulic acid
FA
health-promoting properties of FA
synthesis of FA in plants
metabolism of FA
kwas ferulowy
własciwości prozdrowotne kwasu ferulowego
synteza kwasu ferulowego u roślin
metabolizm kwasu ferulowego
Opis:
The interest in the properties of hydroxycinnamic acids with health-promoting properties is constantly increasing. That is why more and more research is being conducted to better understand these properties. Ferulic acid, FA (4-hydroxy-3-methoxycinnamic acid) is a derivative of hydroxycinnamic acid found in the plant tissue. It is possible to find him among others in bran cereal, popcorn bamboo shoots, and coffee. According to available literature data ferulic acid has a lot of biological properties, particularly appreciated in medicine. Its bioactive properties effectively contribute to the fight against diseases described as a civilization, including neurodegenerative diseases that increase the incidence. As reported the World Alzheimer Report, the number of people with dementia progression in 2016 exceeded 47.5 million, of which 33.5 million were diagnosed with Alzheimer's disease. According to the WHO estimates, this number will triple by 2050. The manuscript presents health-promoting properties of FA on the example of its antioxidant, antidiabetic, hepatoprotective, anti-atherosclerotic, neuroprotective, antineoplastic and antibacterial properties. In addition, the reaction of its synthesis in plants and in-vivo metabolization have been explained. The collected data suggest that bioactive FA molecules can effectively reduce the risk of civilization diseases and significantly reduce the level of oxidative stress contributing to the formation of neurodegenerative diseases.
Źródło:
Biotechnology and Food Science; 2019, 83, 1; 71-85
2084-0136
2299-6818
Pojawia się w:
Biotechnology and Food Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bacterially expressed truncated F2 domain of Plasmodium falciparum EBA-140 antigen can bind to human erythrocytes
Autorzy:
Rydzak, Joanna
Kryńska, Katarzyna
Suchanowska, Anna
Kaczmarek, Radosław
Łukasiewicz, Jolanta
Czerwiński, Marcin
Jaśkiewicz, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/1039687.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
truncated F2 domain purification
human erythrocyte binding
EBA-140 antigen
Plasmodium falciparum
recombinant F2 domain expression
Opis:
The recently identified erythrocyte binding antigen-140 (EBA-140) is a member of the Plasmodium falciparum DBL family of erythrocyte binding proteins, which are considered as prospective candidates for malaria vaccine development. The EBA-140 ligand is a paralogue of the well-characterized P. falciparum EBA-175 antigen. They share homology of domain structure, including Region II, which consists of two homologous F1 and F2 domains and is responsible for ligand-erythrocyte interaction during invasion. It was shown that the F2 domain of EBA-175 antigen seems to be more important for erythrocyte binding. In order to study activity and immunogenicity of EBA-140 antigen F2 domain, it is necessary to obtain recombinant protein of high purity and in a sufficient amount, which used to pose a challenge due to the high content of disulphide bridges. Here, we present a new method for expression and purification of Plasmodium falciparum EBA-140 antigen F2 domain in E. coli Rosetta-gami strain in fusion with the maltose binding protein (MBP). The truncated F2 domain formed by spontaneous proteolytic degradation of the fusion protein was purified by affinity chromatography on Ni-NTA resin followed by size exclusion chromatography. Molecular mass of this protein was confirmed by mass spectrometry. Its N-terminal amino acid sequencing revealed a proteolytic cleavage site within the F2 domain. The proper folding of the recombinant, truncated F2 domain of EBA-140 antigen was confirmed by circular dichroism analysis. The truncated F2 domain can specifically bind to human erythrocytes but its binding is not as efficient as that of full Region II. This confirms that both the F1 and F2 domains of EBA-140 antigen are required for effective erythrocyte binding.
Źródło:
Acta Biochimica Polonica; 2012, 59, 4; 685-691
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hint2, the mitochondrial nucleoside 5-phosphoramidate hydrolase; properties of the homogeneous protein from sheep (Ovis aries) liver
Autorzy:
Bretes, Ewa
Wojdyła-Mamoń, Anna
Kowalska, Joanna
Jemielity, Jacek
Kaczmarek, Renata
Baraniak, Janina
Guranowski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1039587.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
Hint1
Hint2
histidine triad nucleotide binding proteins
purification to homogeneity
nucleoside 5'-phosphoramidase
Opis:
Adenosine 5'-phosphoramidate (NH2-pA) is a rare natural nucleotide and its biochemistry and biological functions are poorly recognized. All organisms have proteins that may be involved in the catabolism of NH2-pA. They are members of the HIT protein family and catalyze hydrolytic splitting of NH2-pA to 5'-AMP and ammonia. At least five HIT proteins have been identified in mammals; however, the enzymatic and molecular properties of only Fhit and Hint1 have been comprehensively studied. Our study focuses on the Hint2 protein purified by a simple procedure to homogeneity from sheep liver mitochondrial fraction (OaHint2). Hint1 protein was also prepared from sheep liver (OaHint1) and the molecular and kinetic properties of the two proteins compared. Both function as homodimers and behave as nucleoside 5'-phosphoramidate hydrolases. The molecular mass of the OaHint2 monomer is 16 kDa and that of the OaHint1 monomer 14.9 kDa. Among potential substrates studied, NH2-pA appeared to be the best; the Km and kcat values estimated for this compound are 6.6 μM and 68.3 s-1, and 1.5 μM and 11.0 s-1 per natively functioning dimer of OaHint2 and OaHint1, respectively. Studies of the rates of hydrolysis of different NH2-pA derivatives show that Hint2 is more specific towards compounds with a P-N bond than Hint1. The thermostability of these two proteins is also compared.
Źródło:
Acta Biochimica Polonica; 2013, 60, 2; 249-254
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The characterization of scaffolds based on dialdehyde chitosan/ hyaluronic acid
Autorzy:
Grabska-Zielińska, Sylwia
Sosik, Adrianna
Małkowska, Anna
Olewnik-Kruszkowska, Ewa
Stein-Brink, Kerstin
Kleszczyński, Konrad
Kaczmarek-Szczepańska, Beata
Powiązania:
https://bibliotekanauki.pl/articles/1844772.pdf
Data publikacji:
2021
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Źródło:
Engineering of Biomaterials; 2021, 24, 163; 76
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tris(8-hydroxyquinoline)aluminium in a polymer matrix as an active layer for green OLED applications
Autorzy:
Sypniewska, Małgorzata
Pokladko-Kowar, Monika
Kaczmarek-Kedziera, Anna
Brumboiu, Iulia E.
Figà, Viviana
Apostoluk, Aleksandra
Song, Peng
Liu, Junyan
Szczesny, Robert
Gondek, Ewa
Derkowska-Zielinska, Beata
Powiązania:
https://bibliotekanauki.pl/articles/2204187.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:
Tris(8-hydroxyquinoline)aluminium
OLED
photo-and electro-luminescence
spectroscopic ellipsometry
DFT calculation
Opis:
Tris(8-hydroxyquinoline)aluminium with poly(N-vinylcarbazole) (Alq₃:PVK) or polystyrene sulfonate (Alq₃:PSS) were deposited by spin-coating on glass and silicon substrates. SEM measurements show that relatively smooth thin films were obtained. Fourier transform infrared measurements were performed to confirm the composition of the samples. The optical properties of thin films containing Alq₃:PVK and Alq₃:PSS were characterised using absorption spectroscopy and spectroscopic ellipsometry. It was found that the absorption spectrum of Alq₃:PVK is characterised by four bands, while for Alq₃:PSS only three bands are visible. The photoluminescence of the studied thin layers shows a peak with a maximum at about 500 nm. Additionally, cyclic voltammetry of Alq₃ is also presented. Theoretical density functional theory calculations provide the insight into the interaction and nature of Alq₃:PVK and Alq₃:PSS excited states. Finally, the organic light-emitting diode (OLED) structure based on Alq₃:PVK was fabricated and showed strong electroluminescence with a green emission at 520 nm. The results of the device show that the ITO/PEDOT:PSS/Alq₃:PVK/Ca/Al system can be useful for the production of low-cost OLEDs with Alq₃:PVK as an active layer for future lighting applications.
Źródło:
Opto-Electronics Review; 2023, 31, 2; art. no. e146105
1230-3402
Pojawia się w:
Opto-Electronics Review
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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