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Wyświetlanie 1-15 z 77
Tytuł:
The Effect of Detonator Shell Materials on Detonation Calorimetry Results
Autorzy:
Němec, Ondřej
Musil, Tomáš
Künzel, Martin
Powiązania:
https://bibliotekanauki.pl/articles/1062738.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
detonation calorimetry
detonator
PETN
heat of detonation
bomb calorimetry
Opis:
Detonation calorimetry is a method for the determination of the heat released by the detonation of an explosive charge. Compared to classical combustion calorimetry, detonation calorimetry requires an inert atmosphere, a large sample mass and a detonator for its initiation. This detonator releases some energy for which the results must be corrected. Four types of detonator have been tested in the calorimeter alone and also in combination with explosive charges of PETN. It was found that the aluminium shell of the detonator considerably increases the apparent heat of detonation of the PETN samples in a vacuum, while the presence of combustible (polymeric) components has the opposite effect. Pressurization of the calorimetric vessel with nitrogen gas only partially suppresses these effects. The preferred technique is to use copper or glass confinement in a high pressure inert atmosphere.
Źródło:
Central European Journal of Energetic Materials; 2020, 17, 4; 552-565
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inhibition study of adenosine deaminase by caffeine using spectroscopy and isothermal titration calorimetry.
Autorzy:
Saboury, A
Divsalar, A
Ataie, G
Amanlou, M
Moosavi-Movahedi, A
Hakimelahi, G
Powiązania:
https://bibliotekanauki.pl/articles/1043464.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
calorimetry
inhibition
caffeine
adenosine deaminase
Opis:
Kinetic and thermodynamic studies were made on the effect of caffeine on the activity of adenosine deaminase in 50 mM sodium phosphate buffer, pH 7.5, using UV spectrophotometry and isothermal titration calorimetry (ITC). An uncompetitive inhibition was observed for caffeine. A graphical fitting method was used for determination of binding constant and enthalpy of inhibitor binding by using isothermal titration microcalorimetry data. The dissociation-binding constant is equal to 350 μM by the microcalorimetry method, which agrees well with the value of 342 μM for the inhibition constant that was obtained from the spectroscopy method. Positive dependence of caffeine binding on temperature indicates a hydrophobic interaction.
Źródło:
Acta Biochimica Polonica; 2003, 50, 3; 849-855
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterisation of Selected Emulsion Phase Parameters in Milk, Cream and Buttermilk
Autorzy:
Brożek, Oskar
Kiełczewska, Katarzyna
Bohdziewicz, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2016033.pdf
Data publikacji:
2022-03-01
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
milk products
size of fat globules
fatty acid profile
differential scanning calorimetry curves
differential scanning calorimetry parameters
Opis:
Milk fat undergoes modification during butter production, which can alter its parameters and suitability for processing. The aim of this study was to compare selected milk fat parameters, including the size of milk fat globules, fatty acid profile and thermal properties, based on the thermal history of milk, cream and sweet buttermilk obtained during continuous churning in butter production. The size of milk fat globules was measured by the laser diffraction method; the fatty acid profile of milk fat was determined by gas chromatography; and the thermal properties of freeze-dried samples were determined by differential scanning calorimetry. The analysed products were arranged in the following descending order based on the size of milk fat globules, expressed by the Sauter mean diameter: cream > raw milk > buttermilk. Buttermilk was characterised by the greatest variations in the size of milk fat globules. A microscopic analysis revealed that an increase in fat content intensified the agglomeration of milk fat globules in cream rela tive to milk. Chains of milk fat globules were observed in buttermilk. Buttermilk was more abundant in monoenoic and polyenoic fatty acids than raw milk and cream. A thermal analysis demonstrated significant ( p≤0.05) differences in the parameters of fat crystallisation and melting peaks between raw milk, buttermilk and cream. The thermal history of the samples influenced the results. Cream was characterised by significantly greater changes in the melting and crystallisation enthalpy of milk fat and significantly higher peak s than milk and buttermilk.
Źródło:
Polish Journal of Food and Nutrition Sciences; 2022, 72, 1; 5-15
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Characterization of the Energetic Compounds Aminoguanidinium-, Triaminoguanidiniumand Azidoformamidinium Perchlorate
Autorzy:
Klapötke, T. M.
Stierstorfer, J.
Powiązania:
https://bibliotekanauki.pl/articles/358855.pdf
Data publikacji:
2008
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
perchlorates
energetic salts
calorimetry
X-ray
DSC
Opis:
Aminoguanidinium perchlorate (2, AGClO4) was formed by the reaction of aminoguanidinium bicarbonate (1) with aqueous perchloric acid solution. Triaminoguanidinium perchlorate (3, TAGClO4) was synthesized by nucleophilic attack of aqueous hydrazine solution on aminoguanidinium perchlorate under release of ammonia. The new and highly explosive azidoformamidinium perchlorate (4, AFClO4) was formed by the reaction of aminoguanidinium perchlorate with potassium nitrite under acidic conditions. The structures of the perchlorate salts in the crystalline state were determined using low temperature single crystal X-ray diffraction yielding monoclinic as well as orthorhombic structures. The compounds were characterized comprehensively using vibrational spectroscopy (IR and Raman), multinuclear (1H, 13C and 15N) NMR spectroscopy, elemental analysis and mass spectrometry. The thermal behavior as well as the decompositions were investigated using DSC (differential scanning calorimetry) and the heats of formation were calculated using heats of combustion determined by bomb calorimetric measurements. In addition, the sensitivities were evaluated using BAM methods (drophammer and friction tester), whereby the perchlorate salts are all sensitive towards impact as well as friction.
Źródło:
Central European Journal of Energetic Materials; 2008, 5, 1; 13-30
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of sample preparation and the presence of other active pharmaceutical ingredients (api) and excipients on the use of dsc method in quantification of paracetamol in commercially available tablets
Autorzy:
TALIK, Przemysław
TALIK, Piotr
HUBICKA, Urszula
Powiązania:
https://bibliotekanauki.pl/articles/1033708.pdf
Data publikacji:
2016
Wydawca:
Zakład Opieki Zdrowotnej Ośrodek Umea Shinoda-Kuracejo
Tematy:
"DSC"
"Differential Scanning Calorimetry"
"acetaminophen"
"ibuprofen"
"paracetamol"
Opis:
The direct Differential Scanning Calorimetry method of the determination of paracetamol in commercially available drugs was developed. The method was based on calibration curves obtained from melting enthalpies ΔH of binary mixtures of paracetamol and commonly used excipients such as starch or microcrystalline cellulose in increasing weight ratios. In order to demonstrate how the technological processes of formulating the tablets affects the quantitative studies, the micronized and nonmicronized mixtures were used. The idea of using micronized mixtures was to simulate these technological processes. The appropriate paracetamol contents of the selected pharmaceutical preparations were calculated and compared. The final results demonstrated, that the contents of paracetamol obtained from micronized samples were much closer to those declared by the manufacturer than the nonmicronized. Excluding two drugs, the influence of starch or cellulose on quantification in the micronized group was not observed whereas in the nonmicronized group it was distinctly visible.
Źródło:
Medicina Internacia Revuo; 2016, 27, 107; 100-106
0465-5435
Pojawia się w:
Medicina Internacia Revuo
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calorimetric Measurements of Ga-Li System by Direct Reaction Method
Autorzy:
Dębski, A.
Powiązania:
https://bibliotekanauki.pl/articles/350810.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
gallium-lithium system
Ga-Li
calorimetry
thermochemistry
Opis:
The direct reaction calorimetric method was used for the determination of the formation enthalpy of alloys which concentrations correspond to the: Ga7Li2, Ga9Li5, GaLi, Ga4Li5, Ga2Li3, and GaLi2 intermetallic phases. The obtained experimental values of the formation enthalpy were: –18.1 ±0.8 kJ/mol at., –26.5 ±0.3 kJ/mol at., –34.7 ±0.3 kJ/mol at., –33.5 ±0.5 kJ/mol at., –32.8 ±0.3 kJ/mol at. and –24.6 ±1.4 kJ/mol at., respectively. After the calorimetric measurements, all the samples were checked by way of X-ray diffraction investigations to confirm the structure of the measured alloys. All the measured values of the formation enthalpy of the Ga-Li alloys were compared with literature data and the data calculated with use of the Miedema model.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 919-926
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermochemical characterization of Ca4La6(SiO4)6(OH)2 a synthetic La- and OH-analogous of britholite: implication for monazite and LREE apatites stability
Autorzy:
Janots, Emilie
Brunet, Fabrice
Goffe, Bruno
Poinssot, Christophe
Burchard, Michael
Cemic, Lado
Powiązania:
https://bibliotekanauki.pl/articles/2086520.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Mineralogiczne
Tematy:
monazite
britholite
apatite
calorimetry
nuclear waste form
Opis:
In this contribution, monazite (LREEPO4) solubility is addressed in a chemical system involving REE-bearing hydroxylapatite, (Ca,LREE)10(PO4,SiO4)6(OH)2. For this purpose, a synthetic (La)- and (OH)-analogous of britholite, Ca4La6(SiO4)6(OH)2, was synthesised and its thermodynamic properties were measured. Formation enthalpy of –14,618.4 ± 31.0 kJ·mol–1 was obtained by high-temperature drop-solution calorimetry using a Tian-calvet twin calorimeter (Bochum, Germany) at 975 K using lead borate as solvent. Heat capacities (Cp) were measured in the 143–323 K and 341–623 K ranges with an automated Perkin-Elmer DSC 7. For calculations of solubility diagrams at 298 K, the GEMS program was used because it takes into account solid solutions. In conditions representative of those expected in nuclear waste disposal, calculations show that La-monazite is stable from pH = 4 to 9 with a minimum of solubility at pH = 7. La-bearing hydroxylapatite precipitates at pH > 7 with a nearly constant composition of 99% hydroxylapatite and 1% La-britholite. Each mineral buffers solution at extremely low lanthanum concentrations (log{La} = 10–10–10–15 mol·kg–1 for pH = 4 to 13). In terms of chemical durability, both La-monazite and La-rich apatite present low solubility, a requisite property for nuclear-waste forms.
Źródło:
Mineralogia; 2008, 39, 1/2; 41--52
1899-8291
1899-8526
Pojawia się w:
Mineralogia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermochemical characterization of Ca4La6(SiO4)6(OH)2 a synthetic La- and OH-analogous of britholite: implication for monazite and LREE apatites stability
Autorzy:
Janots, E.
Brunet, F.
Goffe, B.
Poinssot, C.
Burchard, M.
Cemic, L.
Powiązania:
https://bibliotekanauki.pl/articles/2086546.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Mineralogiczne
Tematy:
monazite
britholite
apatite
calorimetry
nuclear waste form
Opis:
In this contribution, monazite (LREEPO4) solubility is addressed in a chemical system involving REE-bearing hydroxylapatite, (Ca,LREE)10(PO4,SiO4)6(OH)2. For this purpose, a synthetic (La)- and (OH)-analogous of britholite, Ca4La6(SiO4)6(OH)2, was synthesised and its thermodynamic properties were measured. Formation enthalpy of –14,618.4 ± 31.0 kJ·mol–1 was obtained by high-temperature drop-solution calorimetry using a Tian-calvet twin calorimeter (Bochum, Germany) at 975 K using lead borate as solvent. Heat capacities (Cp) were measured in the 143–323 K and 341–623 K ranges with an automated Perkin-Elmer DSC 7. For calculations of solubility diagrams at 298 K, the GEMS program was used because it takes into account solid solutions. In conditions representative of those expected in nuclear waste disposal, calculations show that La-monazite is stable from pH = 4 to 9 with a minimum of solubility at pH = 7. La-bearing hydroxylapatite precipitates at pH > 7 with a nearly constant composition of 99% hydroxylapatite and 1% La-britholite. Each mineral buffers solution at extremely low lanthanum concentrations (log{La} = 10–10–10–15 mol·kg–1 for pH = 4 to 13). In terms of chemical durability, both La-monazite and La-rich apatite present low solubility, a requisite property for nuclear-waste forms.
Źródło:
Mineralogia; 2008, 39, 1/2; 41--52
1899-8291
1899-8526
Pojawia się w:
Mineralogia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of thermal analysis and calorimetry for assessment of safety and quality of nitrogen fertilizers
Autorzy:
Poplawski, D.
Kaniewski, M.
Hoffmann, J.
Hoffmann, K.
Powiązania:
https://bibliotekanauki.pl/articles/30147054.pdf
Data publikacji:
2018
Wydawca:
Akademia Wojsk Lądowych imienia generała Tadeusza Kościuszki
Tematy:
ammonium nitrate
fertilizers
safety
quality
calorimetry
thermal analysis
Opis:
The paper presents the results of studies carried out using differential thermal analysis (DTA) and differential scanning calorimetry (DSC), conjugated with thermogravimetry (TG). Measurements were made for samples with differentiated compositions, mainly consisting of ammonium nitrate with fertilizer purity and compounds that may be present in nitrogen fertilizers as potential additives or contaminants. The possibilities of applied techniques and recommendations concerning proper selection of measurement conditions are described. Furthermore, the method of interpretation of the obtained results is presented, which allows evaluating the thermal stability of the tested mixtures for the safety and quality of nitrogen fertilizers.
Źródło:
Scientific Journal of the Military University of Land Forces; 2018, 50, 3(189); 206-217
2544-7122
2545-0719
Pojawia się w:
Scientific Journal of the Military University of Land Forces
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and thermal decomposition study of some dihydropyridine derivatives
Autorzy:
Baluja, Shipra
Talaviya, Rahul
Powiązania:
https://bibliotekanauki.pl/articles/1192993.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
differential scanning calorimetry
dihydropyridine derivatives
thermo gravimetric analysis
Opis:
Some new dihydropyridine derivatives have been synthesized and their characterization was done by FT-IR, 1H NMR and Mass spectral data. Thermal analysis of these dihydropyridine derivatives have been carried out by thermao gravimetric (TG), differential thermal analysis (DTA) and differential scanning calorimetry (DSC) techniques. Further, from thermograms of these compounds, various kinetic parameters such as order of reaction (n), energy of activation (E), frequency factor (A) and entropy change (∆S) have been evaluated. The obtained results indicates that thermal stability of dihydropyridine derivatives have been depend on the type of substituent present in the compounds.
Źródło:
World Scientific News; 2016, 39; 1-16
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Purification of Hexabenzylhexaazaisowurtzitane
Autorzy:
Gołofit, T.
Maksimowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/358605.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
HBIW
CL-20
purification
differential scanning calorimetry
cryometric method
Opis:
Hexabenzylhexaazaisowurtzitane (HBIW) is produced by a condensation reaction of benzylamine with glyoxal in suitable organic solvents in the presence of protonic acid catalysts. Impurities have to be removed prior to the subsequent stages of the synthesis of CL-20. The effectiveness of HBIW purification by recrystallization from a variety of solvents has been studied here. This method was compared with a novel approach suggested for HBIW purification that consists of prolonged heating of the crude product in boiling methanol. This new purification method allows the product to be prepared in satisfactory purity, it is simple and easily performed on a large-scale.
Źródło:
Central European Journal of Energetic Materials; 2016, 13, 4; 1038-1050
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermogravimetric biomass-to-liquid processes
Autorzy:
Rostek, E.
Biernat, K.
Powiązania:
https://bibliotekanauki.pl/articles/242234.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
biomass
gasification
Thermogravimetric Analysiss
differential scanning calorimetry (DSC)
enthalpy
Opis:
The article presented forecasts for European biofuel production in processes BtL and WtL on the basis of thermochemical technological path. The paper presents the processes of pyrolysis and gasification of biomass leading to the preparation of liquid hydrocarbon fractions in the synthesis of Fischer-Tropsch and processes HTU. Based on the model Koufopanosa, made the right choice of methods to investigate the thermogravimetric kinetics of biomass gasification with a change of enthalpy and identification of degradation products in real time. Presents the results of preliminary tests conducted on the Simultaneous Thermal Analyzer STA 449 F3 Jupiter's Nietzsche. These studies were carried out for samples of cereal straw, crushed to a state of dry dust. Gasification process by subjecting the sample, the test set, recorded curves TG and DSC, and observing the changes in mass, temperature and enthalpy. These studies have been done to pre-determine the conditions under which it may begin the process of liquidation. The study was conducted in an atmosphere of argon / nitrogen and argon / carbon dioxide. The temperature regime provided that the samples were heated to the temperature of500 °C at the heating rate of 3 K/min. Argon was used as protective gas, and N2 and CO2 - as purge gas with flow rates of 30 ml/min. The results, along with discussion, are presented in graphs -derivatograms and charts showing the cumulative weight changes and changes in enthalpy of individual samples.
Źródło:
Journal of KONES; 2011, 18, 2; 377-383
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermodynamics of specific protein-RNA interactions.
Autorzy:
Stolarski, Ryszard
Powiązania:
https://bibliotekanauki.pl/articles/1043600.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
calorimetry
thermodynamics
fluorescence
proteins
specific binding
RNA 5' cap
Opis:
Description of the recognition specificity between proteins and nucleic acids at the level of molecular interactions is one of the most challenging tasks in biophysics. It is key to understanding the course and control of gene expression and to the application of the thus acquired knowledge in chemotherapy. This review presents experimental results of thermodynamic studies and a discussion of the role of thermodynamics in formation and stability of functional protein-RNA complexes, with a special attention to the interactions involving mRNA 5' cap and cap-binding proteins in the initiation of protein biosynthesis in the eukaryotic cell. A theoretical framework for analysis of the thermodynamic parameters of protein-nucleic acid association is also briefly surveyed. Overshadowed by more spectacular achievements in structural studies, the thermodynamic investigations are of equal importance for full comprehension of biopolymers' activity in a quantitative way. In this regard, thermodynamics gives a direct insight into the energetic and entropic characteristics of complex macromolecular systems in their natural environment, aqueous solution, and thus complements the structural view derived from X-ray crystallography and multidimensional NMR. Further development of the thermodynamic approach toward interpretation of recognition and binding specificity in terms of molecular biophysics requires more profound contribution from statistical mechanics.
Źródło:
Acta Biochimica Polonica; 2003, 50, 2; 297-318
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of differential scanning calorimetry to the study of thermodynamic properties of food proteins, particularly of poultry, red meat and egg proteins
Zastosowanie różnicowej kalorymetrii skaningowej do badania termodynamicznych właściwości białek żywności, ze szczególnym uwzględnieniem białek mięsa, drobiu i jaj
Autorzy:
Kijowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1399641.pdf
Data publikacji:
1989
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
differential canning calorimetry
thennodynamic parameters
food proteins
poultry
meat
egg
Opis:
The paper reviews some aspects of differential scanning calorimetry (DSC) and application of this technique in the food protein study, mainly poultry, red meat and egg proteins. Thermodynamic data as the onset, maximum temperature and enthalpy transition of heated protein systems can yield valuable information regarding intrinsic structure stability, protein-protein protein- the other component interaction and denaturation behaviour. DSC can be useful in characterising protein damage in food subjected to a wide range of treatment and proces ing. DSC parameter can indirectly aid in the optimisation and control of different processe such as storage and cooking.
Na przykładzie białek mięsa drobiu i bydła pokazano możliwość wykorzystania RKS do optymalizacji i kontroli procesów obróbki cieplnej. Pokazano również możliwość śledzenia wpływu dodatku NaCl i fosforanów na stabilność cieplną białek mięśniowych. Na przykładzie białek jaja wskazano możliwość śledzenia interakcji białek z białkami (owomukoid-trypsyna), białka z witaminami (awidyna-biotyna), stabilizacji cieplnej konalbuminy w wyniku interakcji z metalami i sacharozą.
Źródło:
Acta Alimentaria Polonica; 1989, 15(39), 4; 299-315
0137-1495
Pojawia się w:
Acta Alimentaria Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Study of the Thermal and Ballistic Properties of SMX
Autorzy:
Sizov, V. A.
Pleshakov, D. V.
Asachenko, A. F.
Topchiy, M. A.
Nechaev, M. S.
Powiązania:
https://bibliotekanauki.pl/articles/358831.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
tetranitrate ester
burning rate
differential scanning calorimetry
decomposition
thermogravimetric analysis
Opis:
The high-density tetranitrate ester 1,4-dinitrato-2,3-dinitro-2,3-bis(nitratomethylene)butane (SMX) was synthesized. The methods of obtaining and isolating the intermediates were optimized. The differences between the syntheses of SMX by a four- and five-step scheme were investigated. Combustion of SMX and its catalysis was studied. The possibility of replacing NG as the main plasticizer in a double-base propellant composition was demonstrated. SMX particles were shown to have pronounced crystal faceting using scanning electron microscopy. The decomposition rate equation was determined. The amount of SMX decomposed under isothermal conditions (90 °C) was 0.8 wt.% after 60 min. Thermogravimetric analysis demonstrated that heating SMX results in two different processes – decomposition and evaporation, with SMX evaporating faster than it decomposes.
Źródło:
Central European Journal of Energetic Materials; 2018, 15, 1; 30-46
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
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