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Wyświetlanie 1-15 z 149
Tytuł:
Stability of selenium diet supplement
Autorzy:
Grzechulska-Damszel, J.
Markowska-Szczupak, A.
Morawski, A. W.
Powiązania:
https://bibliotekanauki.pl/articles/777921.pdf
Data publikacji:
2018
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
selenium supplementation
chemical analysis
microbial analysis
stability
Opis:
Selenium is one of the trace elements playing a crucial role in a proper function of living organisms. Selenium intake varies, largely based on the selenium content of food. The daily Se intake recommended for adults amounts to 55 μg per day. The mean level of selenium in the population varies considerably between countries. Recent studies on the selenium dietary intakes in Poland showed that it is not sufficient to meet the daily requirement for this microelement so it is strongly recommended to employ selenium supplementation. The commercial product SEL-BRCA1®  being a selenium diet supplement was subjected to chemical and microbial analysis to determine its stability in storage time and conditions. Basing on the obtained results it can be stated that the stability of studied supplement, stored in the closed bottles, can be confirmed for the period of time up to 45 months after the production date and it is not recommended to store opened bottles for the period of time longer than 12 months. The studied supplement showed a very high microbial stability what underscores its usefulness as human medicines.
Źródło:
Polish Journal of Chemical Technology; 2018, 20, 4; 84-87
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary PM2.5 and PM10 fractions source apportionment complemented by statistical accuracy determination
Autorzy:
Samek, L.
Stegowski, Z.
Furman, L.
Powiązania:
https://bibliotekanauki.pl/articles/971538.pdf
Data publikacji:
2016
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
chemical analysis
particulate matter
source identification
Opis:
Samples of PM10 and PM2.5 fractions were collected between the years 2010 and 2013 at the urban area of Krakow, Poland. Numerous types of air pollution sources are present at the site; these include steel and cement industries, traffic, municipal emission sources and biomass burning. Energy dispersive X-ray fluorescence was used to determine the concentrations of the following elements: Cl, K, Ca, Ti, Mn, Fe, Ni, Cu, Zn, Br, Rb, Sr, As and Pb within the collected samples. Defi ning the elements as indicators, airborne particulate matter (APM) source profiles were prepared by applying principal component analysis (PCA), factor analysis (FA) and multiple linear regression (MLR). Four different factors identifying possible air pollution sources for both PM10 and PM2.5 fractions were attributed to municipal emissions, biomass burning, steel industry, traffic, cement and metal industry, Zn and Pb industry and secondary aerosols. The uncertainty associated with each loading was determined by a statistical simulation method that took into account the individual elemental concentrations and their corresponding uncertainties. It will be possible to identify two or more sources of air particulate matter pollution for a single factor in case it is extremely difficult to separate the sources.
Źródło:
Nukleonika; 2016, 61, 1; 75-83
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization and Beneficiation of Clays from Ewekoro for use as Drilling Mud
Autorzy:
Olatunde, Abayomi O.
Olafadehan, Olaosebikan A.
Usman, Mohammed A.
Adeosun, Tunde A.
Powiązania:
https://bibliotekanauki.pl/articles/1193491.pdf
Data publikacji:
2021
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Beneficiation
Bentonite
Chemical analysis
Mineralogical analysis
Montmorillonite
Opis:
The proven bentonite reserve in Nigeria has been modestly estimated at more than 700 million tonnes, however her bentonite does not meet the API regulation standard. Hence this work was done with the aim of characterizing and beneficiating Nigeria bentonite clay to meet the required standard. Bentonite clay was gotten from Ewekoro in Ogun state of Nigeria, it was characterized using X-Ray Diffraction (XRD) to identify the structural layers which indicates the arrangement of the atoms in clay samples and X-Ray Fluorescence Spectrophotometer (XRF) which was used in the quantitative analysis of the elements in the sample. The XRD confirmed the presence of montmorillonite meaning the sample contained bentonite, while the XRF confirmed that the sample is Ca-based rather than the standard Na-based, hence the need for beneficiation. Beneficiation of the bentonite was done by ion exchange with Na2CO3 followed by addition with different compositions of viscosifiers namely: carboxymethyl cellulose (CMC), drispac and guar gum. The rheological properties together with the swelling ratio and filter loss of the clay were determined. Although some of the bentonite compositions met the required standard, but the bentonite formulation with the combination of 20.125 g bentonite + 2.875 g guar gum + 0.6 g drispac gave the best result.
Źródło:
World Scientific News; 2021, 159; 45-58
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of physico-chemical parameters and phytoplankton diversity of Ousteri lake in Puducherry
Autorzy:
Dhanam, S.
Sathya, A.
Elayaraj, B.
Powiązania:
https://bibliotekanauki.pl/articles/1191240.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Ousteri lake
Physico-chemical analysis
Phytoplankton
Opis:
The present study was carried out in the Ousteri lake (Puducherry State) from October 2013 to September 2014. The samples were collected during morning hours and were analysed monthly for physical, chemical and biological parameters. The various physico-chemical parameters like Water temperature, pH, Free CO2, Dissolved Oxygen, Turbidity, Electrical conductivity, Total dissolved solids, Total alkalinity, Chloride, Phosphate, Nitrate, Biological oxygen demand and Chemical oxygen demand were analyzed. Results have shown an increased concentration in physico-chemical parameters is more in summer compared to other seasons. The plankton studies were noticed that a total of 34 species belonging to 26 genus under the 4 classes. Among these, Cyanophyceae comprised of 15 species (belonging to 11 genera) followed by Chlorophyceae 9 species (belonging to 7 genera), Bacillariophyceae 7 species (belonging to 6 genera) and Euglenophyceae 3 species (belonging to 2 genera) were recorded. During the study it was found that Cyanophyceae algal growth is dominated over Chlorophyceae, Bacillariophyceae and Euglenophyceae.
Źródło:
World Scientific News; 2016, 54; 153-164
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ceramic technology used in the production of easily abradable pottery (Pakoszówka-Bessów type) from Bessów site 3 in the light of archaeometric analysis
Autorzy:
Okońska, Magdalena
Daszkiewicz, Małgorzata
Bobryk, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/52089825.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
archaeometric analysis
chemical analysis
MGR-analysis
Przeworsk culture
wheelmade pottery
Opis:
The term Pakoszówka-Bessów type pottery is used to describe a specific kind of wheelmade pottery with easily abradable surfaces mostly dated to the 3rd century AD. Site 3 in Bessów, Bochnia Commune, Lesser Poland, is located in the dense Przeworsk culture settlement micro-region occupying the right bank of the lower reaches of the Raba River. The most characteristic feature of locally produced artefacts from Bessów, and to a lesser extent from other sites in the region, is the presence of enormous amounts of this pottery. The aim of laboratory analyses carried out on Pakoszówka-Bessów type pottery from Bessów was to verify the hypothesis that abradability of sherd surfaces is attributable to the alteration effect.
Źródło:
Acta Archaeologica Carpathica; 2018, LIII; 97-128
0001-5229
2719-4841
Pojawia się w:
Acta Archaeologica Carpathica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of Detonation Performance and Characteristics of 2,4,6-Trinitrotoluene Based Melt Cast Explosives Containing Aluminum by Laser Induced Breakdown Spectroscopy
Autorzy:
Rezaei, Amir Hossein
Keshavarz, Mohammad Hossein
Tehrani, Masoud Kavosh
Darbani, Mohammad Reza
Powiązania:
https://bibliotekanauki.pl/articles/358347.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
laser induced breakdown
spectroscopy
molecular structure
chemical analysis
Opis:
Aluminized melt cast formulations based on 2,4,6-trinitrotoluene (TNT) deliver an enhanced blast effect because the secondary combustion process of aluminum (Al) occurs beyond the detonation zone. A new method is introduced to assess the detonation performance and characteristics of aluminized TNT explosives on the basis of the laser-induced breakdown spectroscopy (LIBS) technique, in both air and argon (Ar) atmospheres. The plasma emissions of the prepared samples were recorded, where the atomic lines of Al, C, O and H as well as the molecular bands of AlO, CN and C2 were identified. A good discrimination and separation between the samples was possible using LIBS and principle component analysis (PCA), although they had similar atomic compositions. The quantitative calibration curve obtained using the relative intensity of Al/O was used to determine the detonation velocity/pressure and aluminum content of the TNT/Al samples. Comparisons between experimental and theoretical spectra were made using a Nelder–Mead temperature program for CN bands, which provided good agreement with the fitted spectra. Finally, CN vibrational temperatures were calculated from these spectral fittings. These temperatures have higher values in an Ar atmosphere than in an air atmosphere. Thus, increasing the oxygen concentration can decrease these temperatures in TNT/Al standard samples.
Źródło:
Central European Journal of Energetic Materials; 2019, 16, 1; 3-20
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wyniki badań biomineralogicznych prostaty
Results of biomineralogical investigation of prostate
Autorzy:
Broszkiewicz, A.
Pawlikowski, M.
Kwinta, A.
Chyła, K.
Powiązania:
https://bibliotekanauki.pl/articles/344024.pdf
Data publikacji:
2015
Wydawca:
nakł. Maciej Pawlikowski
Tematy:
prostata
mineralizacja
analiza chemiczna
prostate
mineralization
chemical analysis
Opis:
Wykonano badania mineralogiczne i chemiczne fragmentów prostaty usuniętej podczas zabiegów operacyjnych. Stwierdzono w zmienionych i powiększonych gruczołach prostaty występowanie podwyższonych ilości niektórych pierwiastków co związane jest z tzw. ukrytą mineralizacją tkanek. Mineralizacja ta wydaje się być związana z chemizmem moczu przepływającego przez prostatę i prawdopodobnie może sprzyjać powstawania zmian chorobowych prostaty.
Mineralogical and chemical investigation of prostate glands removed after surgical operation were performed. Higher concentration of some elements were determined at changed larger prostate glands. This phenomenon is result of substitution of elements into biological structures of glans because mineral grains or crystals were not observed. Mentioned mineralization is probably the result of higher mineralization of urine flow through prostate.
Źródło:
Auxiliary Sciences in Archaeology, Preservation of Relics and Environmental Engineering; 2015, 19; 1-22
1689-6742
Pojawia się w:
Auxiliary Sciences in Archaeology, Preservation of Relics and Environmental Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Construction of Basic Scholar Device For Education Proces and For Electro-Chemical Analysis of Solutions
Autorzy:
ADÁMEK, PETR
Powiązania:
https://bibliotekanauki.pl/articles/458050.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Rzeszowski
Tematy:
technology education
operational amplifier
potentiostat
electro – chemical analysis
Opis:
The article deals with construction of electronics device usable in teaching process of tech-nology education. The device is applicable in teaching of programming. Produced activated and tested scholar device is capable make the electro – chemical analysis of liquid solutions. This kind of observation is required in ecology.
Źródło:
Edukacja-Technika-Informatyka; 2018, 9, 3; 359-362
2080-9069
Pojawia się w:
Edukacja-Technika-Informatyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructural and chemical analysis of selected poultry bedding materials — potential substrates in agricultural biogas production technologies
Autorzy:
Sakiewicz, P.
Cebula, J.
Piotrowski, K.
Bohdziewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/1190126.pdf
Data publikacji:
2019
Wydawca:
Gdańska Szkoła Wyższa
Tematy:
agricultural biogas
poultry breeding
bedding biomaterials
chemical analysis
microstructural analysis
Opis:
The research results concerning microstructure and chemical composition of selected post-processed poultry beddings derived from industrial-scale poultry breeding are presented. It was found, that the proper trend is providing the optimal conditions in respect to bred-animals comfort. The highest concentration of biogenic elements — especially nitrogen and potassium — was observed for the samples of poultry manure premixed with the straw. High quality of bedding biomass influences the inhibition of poultry-manure decomposition processes advantageously. In effect, biogas yield increases (due to C/N adjustment), in spite of the fact that increase in ammonium nitrogen concentration simultaneously inhibits the methane fermentation process.
Źródło:
Eco-Energetics: technologies, environment, law and economy; 2019, 2; 113--122
2657-5922
2657-7674
Pojawia się w:
Eco-Energetics: technologies, environment, law and economy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the characteristic and stability of iron diet supplements
Autorzy:
Grzechulska–Damszel, Joanna
Markowska–Szczupak, Agata
Żołnierkiewicz, Grzegorz
Typek, Janusz
Guskos, Nikos
Morawski, Antoni W.
Powiązania:
https://bibliotekanauki.pl/articles/779070.pdf
Data publikacji:
2019
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
iron diet supplements
magnetic analysis
chemical analysis
microbial analysis
supplements stability
Opis:
The iron diet supplements: AproFER 1000 and AproTHEM were subjected to various chemical, microbial and magnetic analysis. The microbial analysis revealed no presence of pathogenic bacteria in the studied products. No signifi cant changes in iron content or forms (bivalent/trivalent) were observed in EPR analysis of supplements stored at different conditions for a long period of time. The chemical and magnetic analysis showed that both AproFER 1000 and AproTHEM contain a high concentration of bivalent iron so they can be used as an iron diet supplements.
Źródło:
Polish Journal of Chemical Technology; 2019, 21, 3; 60-67
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wyniki badań składu chemicznego zabytków ze stopu miedzi, Okonek, pow. złotowski, woj. wielkopolskie
Results of the research on chemical composition of artefacts made from copper alloys from Okonek, Złotów District, Wielkopolskie Voivodeship
Autorzy:
Biborski, Marcin
Biborski, Mateusz
Powiązania:
https://bibliotekanauki.pl/articles/896901.pdf
Data publikacji:
2017
Wydawca:
Narodowy Instytut Dziedzictwa
Tematy:
Bronze Age hoard
chemical analysis of artefacts
XRF
Okonek
Opis:
An assemblage of 12 artefacts from a Bronze Age hoard was found in the Forest District of Okonek, Złotów Dstrict, Wielkopolskie Voivodeship and was subject to non-destructive testing of chemical composition. The conducted analyses show that the content of particular elements in the examined artefacts, especially copper and tin, as well as the content of additional ingredients of alloys that have an effect on their quality (lead, antimony and arsenic), is strongly varied. Based on the observed differences in the composition of bronze alloys from which particular artefacts are made, one can conclude that not all of them were produced in the same artisan workshop.
Źródło:
Raport; 2017, 12; 83-87
2300-0511
Pojawia się w:
Raport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the elemental contents of date palm (Phoenix dactylifera L.) from Kharj Saudi Arabia
Autorzy:
Taha, Kamal K.
Al Ghtani, Fahad M.
Powiązania:
https://bibliotekanauki.pl/articles/1194043.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Palm dates
Phoenix dactyllifera
chemical analysis
estimated daily intake
Opis:
Date palm (Phoenix dactylifera) fruit are an important source of nutritional elements to people in Saudi Arabia. In this study dates fruit samples from the type Segae were collected . Washed and unwashed samples were analyzed for macro and micro-elements using flame photometry inductivity coupled plasma and atomic absorption. The study revealed that the dates have considerable contents of Fe and Mn which are important to human health . The content of trace elements that can be toxic like As, Cd, Ni and Bi was found to be less in washed samples compared to unwashed samples. The study recommends the incorporation of date fruits in the food menu.
Źródło:
World Scientific News; 2015, 12; 66-76
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Meteoryt Morasko – nowe badania mineralogiczne
The Morasko Meteorite – a new mineralogical investigations
Autorzy:
Kołodziej, Mieszko
Muszyński, Andrzej
Idzikowski, Bogdan
Powiązania:
https://bibliotekanauki.pl/articles/1033126.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Meteorytowe
Tematy:
chemical analysis
hard-magnetic phases
iron meteorite
nodules
tetrataenite
Opis:
The Morasko Meteorite nature reserve is located in Morasko, on the northern edge of the city of Poznań, Poland. In this area the biggest known in Central Europe iron meteorite fall occurred. New mineral phases Moraskoite Na2Mg(PO4)F and Czochralskiite Na4Ca3Mg(PO4)4 have been discovered in the Morasko Meteorite. Both are phosphates, which exist as a parts of nodules – oval inclusions which occur in some iron meteorites, including the Morasko Meteorite. This paper describes the results of our investigation on nodules separated from the Morasko meteorite. Among others, the silicates in form of pyroxene from clinoenstatite group and olivines from forsterite group were found. The presence of phosphates in the form of merrillites was confirmed by electron microprobe analyser. In the metallic parts, on contact between kamacite and taenite crystals, rims (lammelas) composed of tetrataenite were detected. This phase is known to have hard-magnetic properties and could be used as cheaper equivalent for commonly used compounds based on rare earth elements for permanent magnets production.
Źródło:
Acta Societatis Metheoriticae Polonorum; 2019, 10; 62-73
2080-5497
Pojawia się w:
Acta Societatis Metheoriticae Polonorum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Review of the studies on nutrition in Polish preschool children. Part 2. Meals prepared at preschool
Autorzy:
Merkiel-Pawlowska, S.
Chalcarz, W.
Powiązania:
https://bibliotekanauki.pl/articles/874846.pdf
Data publikacji:
2017
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Tematy:
human nutrition
Polska
child
meal
chemical analysis
nutrient
energetic index
Opis:
This article is the second part of the review of the studies on nutrition in Polish preschool children. In the first part, studies on preschool menus assessment were presented and summarised, whereas this article reviews the studies on the assessment of foods and meals prepared at preschool. The aim of this review was to present and summarise the results of the studies on the assessment of meals prepared for children at preschool based on the reports from the preschool food storeroom, the studies on chemical analysis of sample meals served at preschools and the studies on comparison of the results of chemical analysis to the results obtained by calculations obtained from computer programmes. The results of the studies on the assessment of meals prepared for children at preschool using various methods confirm most of the findings from the studies on the assessment of preschool menus. It is necessary to carry out more studies on energy and nutrient content assessment of preschool meals determined by chemical analysis of sample meals in order to provide more accurate information about the real nutritional value of meals served to children at preschool. It is essential to update the Polish food composition tables to enable more precise calculations of nutritional value of the meals planned for children at preschools which will improve the possibility of adjusting preschool meals to the real needs of both 3-year-old and 4-6-year-old children during their stay at preschool.
Niniejsza praca jest drugą częścią przeglądu badań dotyczących żywienia polskich dzieci w wieku przedszkolnym. W pierwszej części przedstawiono i podsumowano wyniki prac poświęconych ocenie jadłospisów przedszkolnych. Niniejsza część dotyczy oceny posiłków przygotowanych w przedszkolu. Celem pracy było przedstawienie i podsumowanie wyników badań dotyczących oceny posiłków przygotowywanych dla dzieci w przedszkolach na podstawie raportów magazynowych, analizy chemicznej posiłków serwowanych w przedszkolach oraz badań, w których porównano wartość odżywczą posiłków ocenioną metodą analizy chemicznej i metodą obliczeniową przy użyciu programów komputerowych. Wyniki badań dotyczących oceny posiłków przygotowanych dla dzieci w przedszkolach przy zastosowaniu różnych metod oceny potwierdzają większość wniosków wynikających z prac dotyczących oceny jadłospisów przedszkolnych. Należy prowadzić więcej badań dotyczących oceny zawartości energii i składników pokarmowych w przedszkolnych posiłkach na podstawie analizy chemicznej, aby uzyskać bardziej dokładne informacje odnośnie rzeczywistej wartości odżywczej posiłków serwowanych dzieciom w przedszkolach. Konieczne jest uaktualnienie polskich tabel wartości odżywczej żywności, aby zapewnić większą dokładność obliczeń wartości odżywczej posiłków planowanych dla dzieci w przedszkolach, co przyczyni się do zwiększenia możliwości dostosowania przedszkolnych posiłków do rzeczywistych potrzeb zarówno dzieci trzyletnich, jak i 4-6-letnich podczas ich pobytu w przedszkolu.
Źródło:
Roczniki Państwowego Zakładu Higieny; 2017, 68, 1
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Northern elements in the Lusatian culture in Slovakia on the example of bronze artefacts from Orava
Autorzy:
Danielová, Barbora
Powiązania:
https://bibliotekanauki.pl/articles/52089824.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Orava
Lusatian culture
chemical analysis
cultural contacts
bronze artefacts
Carpathians
Opis:
The paper presents Lusatian culture bronze artefacts recovered in the Orava region in northern Slovakia, which allows for tracing connections with the territory of present-day Poland in the Late Bronze Age and the Early Iron Age. The object is to discuss the provenance of the Lusatian bronze artefacts and analyse possible intercultural contacts with the north, across the Carpathians.
Źródło:
Acta Archaeologica Carpathica; 2018, LIII; 77-95
0001-5229
2719-4841
Pojawia się w:
Acta Archaeologica Carpathica
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 149

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