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Tytuł:
Current Injection Attack against the KLJN Secure Key Exchange
Autorzy:
Chen, H.-P.
Mohammad, M.
Kish, L. B.
Powiązania:
https://bibliotekanauki.pl/articles/220991.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
KLJN
current injection attack
secure key exchange
unconditional security
privacy amplification
Opis:
The Kirchhoff-law-Johnson-noise (KLJN) scheme is a statistical/physical secure key exchange system based on the laws of classical statistical physics to provide unconditional security. We used the LTSPICE industrial cable and circuit simulator to emulate one of the major active (invasive) attacks, the current injection attack, against the ideal and a practical KLJN system, respectively. We show that two security enhancement techniques, namely, the instantaneous voltage/current comparison method, and a simple privacy amplification scheme, independently and effectively eliminate the information leak and successfully preserve the system’s unconditional security.
Źródło:
Metrology and Measurement Systems; 2016, 23, 2; 173-181
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of substrate temperature on the optical and structural properties of CdS nano particles
Wpływ temperatury podłoża na właściwości optyczne i strukturalne nanocząstek CdS
Autorzy:
Qassim, Barzan Kh.
Uonis, Mohammad M.
Khaleel, Erada A.
Powiązania:
https://bibliotekanauki.pl/articles/41152375.pdf
Data publikacji:
2023
Wydawca:
Wydawnictwo SIGMA-NOT
Tematy:
CdS thin films
optical properties of CdS
chemical spray pyrolysis
CdS nanoparticles
cienkie warstwy CdS
właściwości optyczne CdS
chemiczna piroliza natryskowa
nanocząstki CdS
Opis:
Thin films of CdS have been deposited on glass substrates using the chemical spray pyrolysis method at different substrate temperatures of 100°C, 150°C, 200°C, and 250°C to investigate the optimum temperature to prepare CdS particles with nano dimensions. The CdS thin film was examined using SEM, X-ray spectrum analysis, and UV-visible spectrophotometry. The SEM images and X-ray spectra were used to estimate the structural features and grain size of the films. The optical properties and optical constants also varied clearly with temperature. In addition, the energy gap changed with temperature from 2.1 eV to 2.55 eV.
Wpływ temperatury podłoża na właściwości optyczne i strukturalne nanocząstek CdS Cienkie warstwy CdS zostały osadzone na szklanych podłożach metodą chemicznej pirolizy natryskowej w temperaturach podłoża wynoszących 100°C, 150°C, 200°C i 250°C w celu określenia optymalnej temperatury do przygotowania cząstek CdS o wymiarach nano. Tak przygotowane próbki zostały zbadane za pomocą SEM i spektrofotometrii UV-VIS, przeprowadzono także analizę widma rentgenowskiego. Obrazy SEM i widma rentgenowskie zostały wykorzystane do oszacowania cech strukturalnych i wielkości ziarna warstw. Właściwości optyczne i stałe optyczne zmieniały się wyraźnie wraz ze zmianą temperatury. Przerwa energetyczna wynosiła w zależności od temperatury od 2,1 eV do 2,55 eV.
Źródło:
Ochrona przed Korozją; 2023, 11; 354-357
0473-7733
2449-9501
Pojawia się w:
Ochrona przed Korozją
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation on the Acoustic Characteristics of Multi-Layer Nonwoven Structures. Part 1 - Multi-Layer Nonwoven Structures with the Simple Configuration
Badania charakterystyki akustycznej wielowarstwowych struktur włókninowych. Część 1 - Wielowarstwowe struktury włókninowe o prostej konfiguracji
Autorzy:
Mirjalili, S. A.
Mohammad-Shahi, M.
Powiązania:
https://bibliotekanauki.pl/articles/231885.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
akustyka
warstwy włókninowe
współczynnik pochłaniania dźwięku
struktura wielowarstwowa
absorpcja dźwięku
acoustics
nonwoven
coefficient of sound absorption
tube impedance
Opis:
In this research work the amount of sound absorption in different multi-layer structures made from nonwoven layers and placed in various configurations were measured and analysed. After producing nonwovens with specified geometric characteristics, multi-layer structures with different configurations were made. We investigated the multi-layer structures and found out that when the number of layers in a structure increases, its sound absorption would rise. It was also observed that the increase in sound absorption at lower frequencies only occurs when the thickness of nonwovens is increased. However, at high frequencies the thickness of the nonwoven layers has a slight influence on the sound absorption of the multi-layer structure. It was also seen in the multi-layer structures that, with a less distance between layers, increasing the number of layers in the structures would positively improve the sound absorption. Hence, this property can be improved either by increasing the distance between the layers or simultaneously decreasing the number of layers in the multi-layer structures, although this trend would be true for panels having less than four nonwoven layers and at frequencies up to 1000 Hz.
Badano wartość absorpcji dźwięku w wielowarstwowych strukturach wytworzonych z warstw włókninowych umieszczonych w różnych konfiguracjach. Po wyprodukowaniu włóknin uformowano różnego rodzaju konfiguracje. Stwierdzono, że przy wzroście ilości warstw w danej strukturze wzrasta również absorpcja dźwięku. Zaobserwowano, że wzrost absorpcji dźwięku przy niższych częstotliwościach wzrasta tylko przy wzroście grubości włóknin. Jednakże przy wyższych częstotliwościach grubość warstwy włókniny ma tylko niewielki wpływ na absorpcje dźwięku w strukturach wielowarstwowych. Zaobserwowano również ze w strukturach wielowarstwowych przy mniejszych odległościach pomiędzy warstwami i wzroście ilości warstw w strukturze wielowarstwowej wzrasta absorpcja dźwięku. Wynika z tego, że absorpcja dźwięku może być polepszona albo poprzez wzrost odległości pomiędzy warstwami lub równoczesne zmniejszenie liczby warstw w strukturze wielowarstwowej.
Źródło:
Fibres & Textiles in Eastern Europe; 2012, 3 (92); 73-77
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Study of Copper Alloy with Graphene Additive via x-Ray Diffraction
Autorzy:
Masri, Mohamad Najmi
Mohammad, M.
Yusoff, Mahani
Mamat, Sarizam
Teo, Pao Ter
Othman, R.
Irfan, Abd Rahim
Singh, Pramod K.
Powiązania:
https://bibliotekanauki.pl/articles/2134097.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
copper alloy
graphene
powder metallurgy
copper
zinc
Opis:
This study evaluated the effect of milling speed and compaction pressure on the densification and morphology of the CuZn-Gr composite. The composite was prepared by using the powder metallurgy technique. The effect on the microstructural and compaction was determined based on different milling speeds. The different milling speeds involved were 175, 200, 225, and 250 rpm. Meanwhile, the different compaction pressures used in this study were 127, 250, 374, and 500 MPa. The properties of the milled powder gave the result to green density and densification parameters. The XRD pattern of Cu and Zn broadened as milling time increased.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 3; 1051--1053
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessing Water Quality of Kufranja Dam (Jordan) for Drinking and Irrigation: Application of the Water Quality Index
Autorzy:
Abualhaija, Mahmoud M.
Mohammad, Alsharifa-Hind
Powiązania:
https://bibliotekanauki.pl/articles/1955562.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
Kufranja Dam
Jordan
physicochemical parameter
water quality index
drinking
irrigation
Opis:
The current study was undertaken to assess the physicochemical quality of the Kufranja dam (KD) surface water in northern Jordan during the summer and winter seasons [2019]. The samples were analyzed for temperature, pH, dissolved oxygen, conductivity, major cations, major anions, and heavy metals. Most of the physicochemical parameters exhibited a similar spatial distribution, where the maximum concentrations were observed at the dam’s entrance, while the minimum concentrations were recorded at the dam’s end. This indicates that the factors affecting their occurrence and distribution are the same, including natural discharges from the surrounding catchment areas, weathering products, agricultural activities, and wastewater effluents that enter the dam via Wadi Kufranja. All the physicochemical parameters and heavy metals in KD water lie below the maximum permissible levels of the Jordanian and international standards for drinking and irrigation, except for EC values that are above WHO standards for drinking. The application of the water quality index (WQI) depicts that the KD water is chemically unsuitable for use in drinking and needs proper treatment before use. The irrigation indices (SAR, Na%, and MH) indicate that the KD water is chemically suitable for irrigation, whereas EC results and USSL diagram showed that the dam’s water is suitable for irrigation and belongs to the categories of good to permissible for irrigation. Therefore, KD water is suitable for irrigation of most soils (except soils with low salt tolerance). Crops with good salt tolerance are recommended and a special treatment of salinity might be required.
Źródło:
Journal of Ecological Engineering; 2021, 22, 9; 159-175
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corrosion Behavior of Amorphous-Nanocrystalline Ni50Ti50 Shape Memory Alloy
Autorzy:
Aghabeygzadeh, H.
Mohammad Sharifi, E.
Tavoosi, M.
Powiązania:
https://bibliotekanauki.pl/articles/2049440.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
NiTi
shape memory alloy
amorphous
nanocrystalline
corrosion
Opis:
In the present study, the corrosion behaviors of amorphous-nanocrystalline Ni50Ti50 shape memory alloy with different crystallite sizes were investigated. The Ni50Ti50 homogenized specimens were hot rolled and annealed at 950°C. Thereafter, the nanocrystalline Ni50Ti50 specimens with different crystalline sizes in the range of 40-350 nm were prepared by cold rolling and annealing at temperature range of 400 to 900°C. The corrosion resistance of Ni50Ti50 specimen with coarse grain size has significantly increased after cold rolling as a result of the formation of amorphous-nanocrystalline structure. The amorphous and nanocrystalline (with the crystallite size of about 40 nm) Ni50Ti50 samples exhibited the best corrosion resistance in the 5% HCl electrolyte with the corrosion potential and corrosion current density of about –197 mV and 2.34×10-6 A/cm2, respectively. This effect can be attributed to the higher density of crystalline defects in amorphous and nanocrystalline structures to quickly form protective films on the surface.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 1; 267-272
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development a new classification for assessing the coal mine mechanization
Opracowanie nowej klasyfikacji dla oceny mechanizacji w kopalniach węgla
Autorzy:
Mehdi, H. S.
Reza, M.
Mohammad, A.
Khalokakaei, R.
Akhyani, M.
Powiązania:
https://bibliotekanauki.pl/articles/219726.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mechanizacja wydobycia
złoże węglowe
system klasyfikacji
wskaźnik mechanizacji dla danego złoża
mechanization
coal seams
classification system
CSMi
Opis:
The coal mine mechanization is important to achieve optimum quality and maximum efficiency of coal production. Mechanization is an objective that can result in significant cost reductions and higher levels of profitability for underground mines. The potential of coal mine mechanization depends on some important factors Such as seam inclination and thickness, geological disturbances, seam floor conditions and roof conditions. These factors should be considered in coal mine mechanization analysis. In this study, the new classification was developed with the respect to the mentioned factors. Using this system the coal seam mechanization index (CSMi) of several types of coal seams was evaluated and classified into five categories; very good, good, medium, low and very low. As a case study, the mechanization of the Takht coal seams in Golestan area of Iran was investigated using this new classification system. The results show a low potential for mechanization in most of the Takht coal seams.
Mechanizacja prac w kopalniach węgla jest konieczna dla osiągnięcia maksymalnej wydajności produkcji i uzyskania węgla najwyższej jakości. Mechanizacja jest celem, który skutkować będzie znacznym obniżeniem kosztów oraz zwiększeniem poziomu rentowności produkcji w kopalniach podziemnych. Możliwości mechanizacji w kopalniach uzależnione są od szeregu ważnych czynników, takich jak nachylenie i miąższość złoża, obecność zaburzeń struktury geologicznej a także warunki stropowe i spągowe. Czynniki te koniecznie uwzględnić należy w analizach możliwości mechanizacji pracy kopalni. W pracy tej przedstawiono nową klasyfikację opartą o wyżej wymienione czynniki. W oparciu o przyjęte podejście, obliczony został wskaźnik mechanizacji dla złoża węgla i następnie zastosowany został do analiz. Na jego podstawie wyodrębniono pięć kategorii złóż węglowych w kontekście możliwości mechanicznego urabiania: bardzo dobre, dobre, średnie, niskie i bardzo niskie. Jako studium przypadku przedstawiono analizę złoża węglowego Takht w regionie Golestan w Iranie, w oparciu o zaproponowany nowy system klasyfikacji. Wyniki analizy wskazują, że większość złóż w regionie Takht stwarza niewielkie możliwości dla zastosowania mechanizacji.
Źródło:
Archives of Mining Sciences; 2013, 58, 1; 217-226
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, computational, anticancerous and antiproliferative effects of some copper, manganese and zinc complexes with ligands derived from symmetrical 2,2’-diamino-4,4’-dimethyl-1,1’-biphenyl-salicylaldehyde
Autorzy:
Ababneh, Taher S.
El-Khateeb, Mohammad
Tanash, Aissar K.
AL-Shboul, Tareq M.A.
Shammout, Mohammad Jamal A.
Jazzazi, Taghreed M.A.
Alomari, Mohammad
Daoud, Safa
Talib, Wamidh H.
Powiązania:
https://bibliotekanauki.pl/articles/1849324.pdf
Data publikacji:
2021
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
tetradentate schiff base
symmetrical metal complexes
DFT calculation
spectroscopy
anticancerous
antiproliferative
Opis:
Four new symmetrical Schiff bases derived from 2,2’-diamino-4,4’-dimethyl-1,1’-biphenyl-salicylaldehyde have been synthesized and characterized by elemental analysis and different spectroscopic techniques. The reaction of 2,2’-diamino-4,4’-dimethyl-1,1’-biphenyl with two equivalents of 5-tert-butyl-, 3,5-dinitro-, 3,5-dibromo- and 3-tert-butyl-salicylaldehyde yielded 2,2’-bis(5-tert-butyl-salicylideneamino)-4,4’-dimethyl-1,1’-biphenyl (A1) as well as the 3,5-dinitro- (A2), 3,5-dibromo- (A3) and 3-tert-butyl- (A4) substituted derivatives. The tetradentate ligands were then reacted with copper-, manganese- and zinc-acetate producing the tetra-coordinate metal complexes which were characterized by FTIR, UV-Visible spectroscopy, magnetic susceptibility and elemental analysis. Zinc complexes were characterized by 1H-NMR spectroscopy. Density functional theory (DFT) calculations at the B3LYP/6-31G(d) level of theory were carried out to fully optimize and examine the molecular geometries of complexes. Subsequently, IR vibrational and UV-Vis absorption spectra were computed and correlated with the observed values and the results are in good agreement with the experimental data. The anticancerous and antiproliferative activity of the A3 ligand and its metal complexes were determined.
Źródło:
Polish Journal of Chemical Technology; 2021, 23, 1; 7-15
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ZnO Nanopowders as Chemical Sensor to Malathion Vapor
Autorzy:
Al-Mohammad, A.
Darwich, R.
Rukiah, M.
Abo Shaker, S.
Kakhia, M.
Powiązania:
https://bibliotekanauki.pl/articles/1195948.pdf
Data publikacji:
2014-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.16.Be
84.37.+q
81.20.Ev
81.20.Wk
07.07.Df
Opis:
Thick films of zinc oxide (ZnO) nanopowders have been prepared by high energy ball-milling for various spans of mill time (3-18 h). The morphology and crystal structure of the prepared ZnO powder were characterized by scanning electron microscope and X-ray diffraction. The ZnO thick films were then used to construct a gas sensor for O,O-dimethyl dithiophosphate of diethyl mercaptosuccinate (malathion) at different operating temperatures. The sensor response at 100 ppm of malathion was found to reach a maximum as large as 80 at 6 h of high energy ball-milling, four times larger than that found for ethanol. Scanning electron microscope observation of the granular state and pore size distribution analyses indicated that increasing high energy ball-milling time gave rise especially to an increase in the volume of pores in the pore size range of 6-35 nm. It is suggested that such a change in nanostructure is responsible for the marked promotion of the response to malathion.
Źródło:
Acta Physica Polonica A; 2014, 125, 1; 131-134
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Record data from Kies distribution and related statistical inferences
Autorzy:
Al-Olaimat, Nesreen M.
Bayoud, Husam A.
Raqab, Mohammad Z.
Powiązania:
https://bibliotekanauki.pl/articles/1917056.pdf
Data publikacji:
2021-12-08
Wydawca:
Główny Urząd Statystyczny
Tematy:
Bayesian estimates
Kies distribution
maximum likelihood estimation
records
Opis:
The Kies probability model was proposed as an alternative to the extendedWeibull models as it provides a more efficient fit to some real-life data sets in comparison to the aforementioned models. The paper proposes classical and Bayesian inferences for the Kies distribution based on records. Maximum likelihood estimates are studied jointly with asymptotic and bootstrap confidence intervals. Moreover, Bayes estimates, along with credible intervals are discussed assuming squared and LINEX loss functions. The proposed estimation methods have been investigated and compared via simulation studies. A real data set has been analysed for illustrative purposes.
Źródło:
Statistics in Transition new series; 2021, 22, 4; 153-170
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solid-State Mechanochemical Synthesis of Kaolinite-Urea Complexes for Application as Slow Release Fertilizer
Autorzy:
AlShamaileh, Ehab M.
Al-Rawajfeh, Aiman E.
Alrbaihat, Mohammad R.
Powiązania:
https://bibliotekanauki.pl/articles/123521.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
mechano-chemical
ball milling
slow release
kaolinite
urea
Opis:
This study investigated a mechanochemical (MC) process for synthesizing a slow-release urea fertilizer by cogrinding the starting materials of (NH2)2CO and amorphous kaolinite in a planetary ball mill. The tests with kaolinite contents ranging from 25 to 75 wt. %, milling time ranging from 1 (h) to 3 (h) and mill rotational speeds from 200 to 700 rpm were performed to evaluate the incorporation of (NH2)2CO and release of nitrogen into the solution. The analyses conducted using XRD, TGA, FT-IR and KNDU (Kjeldahl Nitrogen Determination Unit) indicated that the MC process was successfully applied to incorporate (NH2)2CO into the amorphous kaolinite structure. The release of nitrogen from the system (kaolinite-(NH2)2CO) when dispersed in water for 24 h reached up to 20% at 25% wt of kaolinite. Moreover, under the milling speed conditions for the system (kaolinite–(NH2)2CO), release of nitrogen reached between 25 and 40%. These results indicated that the MC process can be developed to allow amorphous kaolinite to act as a carrier of nitrogen nutrients to be released slowly for use as fertilizer.
Źródło:
Journal of Ecological Engineering; 2019, 20, 9; 267-276
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
In - house preparation and evaluation of Tc-99m-HIG kit for detection of infection in AIDS patients
Autorzy:
Bakir, M. A.
Mansour, R.
Mohammad, A.
Habil, K.
Yassine, T.
Powiązania:
https://bibliotekanauki.pl/articles/147896.pdf
Data publikacji:
2012
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
99mTc-HIG
HYNIC
infection imaging
Opis:
99mTc-HIG can be used for early detection of inflammation and infection foci especially in immunodeficiency patients. The present study involves in-house preparation and evaluation of human immunoglobulin-hydrazinonicotinic acid (HIG-HYNIC) kit to be labeled with 99mTc. In this indirect labeling method, the structure and biological activity of the protein can be maintained. The kit consists of two vials A and B, the vial A contains 2 mg of HIG-HYNIC, and the vial B contains 10 mg of tricine and 1 mg of stannous chloride dihydrate (SnCl2.2H2O). The results revealed that the lyophilized kits were stable for at least 10 months, and showed a high quality from the points of physical, chemical, radiochemical and biological purities, and its validity for human injection. The labeling yield of HIG-HYNIC compound exceeded 98%. The application of the prepared kit was experimentally illustrated in animal models with artificially induced inflammatory lesions after E. coli injection into rat leg muscle. The biodistribution and imaging studies in rats have shown good localization in infected muscle (T) in comparison to the normal muscle (M) 4 and 24 h after injection. Ratios of 17 and 18 were achieved 4 and 24 h post injection, respectively. The results of biodistribution of 99mTc-HIG in human and initial clinical evaluation show that this agent is a good radiopharmaceutical for infection imaging.
Źródło:
Nukleonika; 2012, 57, 1; 117-124
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trace elements in scalp hair of leukaemia patients
Autorzy:
Khuder, A.
Bakir, M. A.
Hasan, R.
Mohammad, A.
Habil, K.
Powiązania:
https://bibliotekanauki.pl/articles/971518.pdf
Data publikacji:
2014
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
leukaemia
principal component analysis
scalp hair
U-test
X-ray fluorescence
Opis:
The aim of this study was to determine the concentration of Fe, Ni, Cu, Zn and Pb in scalp hair of leukaemia patients and healthy volunteers, using the optimised XRF method. Leukaemia hair samples were classifi ed corresponding to type, growth and age of the participants. The results showed that the studied trace elements (TEs) in both of leukaemia and control groups were positively skewed. In comparison with the control group, lower Fe, Cu, Zn and Pb and higher of Ni medians were found in all studied leukaemia patients. The median rank obtained by Mann–Whitney U-test revealed insignifi cant differences between the leukaemia patients subgroups and the controls. An exact probability (α < 0.05) associated with the U-test showed signifi cant differences between medians in leukaemia patients and controls groups for Pb (lymphatic/control, acute/control), Cu (lymphatic/control, chronic/control), Ni (lymphatic/control, chronic/control) and Fe (chronic/control). Very strong positive and negative correlations (r > 0.70) in the scalp hair of control group were observed between Ni/Fe-Ni, Cu/Fe-Cu, Zn/Fe-Zn, Pb/Fe-Pb, Cu/Ni-Zn/Ni, Cu/Ni-Pb/Ni, Zn/Ni-Pb/Ni, Zn/Fe-Zn/Cu, Pb/Ni-Ni and Ni/Fe-Pb/Ni, whereas only very strong positive ratios in the scalp hair of leukaemia patients group were observed between Ni/Fe-Ni, Cu/Fe-Cu, Zn/Fe-Zn and Pb/Fe-Pb, all correlations were signifi cant at p < 0.05. Other strong and signifi cant correlations were also observed in scalp hair of both groups. Signifi cant differences between grouping of studied TEs in all classifi ed leukaemia groups and controls were found using principal component analysis (PCA). The results of PCA confi rmed that the type and the growth of leukaemia factors were more important in element loading than the age factor.
Źródło:
Nukleonika; 2014, 59, 3; 111-120
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Induction of hemolysis and eryptosis by occupational pollutant nickel chloride is mediated through calcium influx and p38 MAP kinase signaling
Autorzy:
Alfhili, Mohammad A.
Alamri, Hassan S.
Alsughayyir, Jawaher
Basudan, Ahmed M.
Powiązania:
https://bibliotekanauki.pl/articles/2085691.pdf
Data publikacji:
2022-02-15
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
calcium
p38 MAPK
oxidative stress
hemolysis
nickel
eryptosis
Opis:
ObjectivesNickel (Ni) is an abundant environmental hazard and an occupational pollutant. Exposure to Ni compounds is prevalent in electroplating workers and in the printing industry, among others. The toxicity of Ni manifests as dermatological, gastrointestinal, respiratory, allergic, and cardiovascular symptoms. In particular, hyperbilirubinemia and reticulocytosis have been detected in intoxicated subjects; an observation possibly implicating selective red blood cell (RBC) toxicity. Herein, the interaction of nickel chloride (NiCl2) with human RBCs and associated molecular mechanisms are described.Material and MethodsCells from healthy donors were incubated for 24 h at 37°C in the presence or absence of 0.5‒10 mM of NiCl2, and cytotoxicity was determined through hemoglobin leakage by colorimetry under different experimental conditions. Eryptotic markers were also identified by flow cytofluorometry using Annexin-V-FITC tagging for phosphatidylserine (PS) exposure, light scatter properties for cellular dimensions, Fluo4/AM labeling for intracellular calcium, and H2DCFDA staining for reactive oxygen species (ROS). Additionally, small molecule inhibitors were used to probe the signaling pathways involved.ResultsIt was found that NiCl2 at 10 mM caused profound intracellular calcium overload and significant calcium-dependent hemolysis. Also, NiCl2 reduced forward scatter and increased side scatter, Annexin-positive cells, and ROS levels. Importantly, NiCl2-induced hemolysis was significantly attenuated by the exclusion of extracellular calcium, and in the presence of p38 MAP kinase (MAPK) inhibitor SB203580.ConclusionsIt is concluded that NiCl2 induces p38 MAPK-dependent hemolysis, and stimulates the canonical features of premature eryptosis. This report presents the first description of the molecular mechanisms underlying the hemolytic and eryptotic potential of NiCl2 and, thus, may explain changes in hematological parameters observed in poisoning victims.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2022, 35, 1; 1-11
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 21

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