Search results for " metal"

showing 9 items of 2159 documents

The impact of Mt. Etna volcanic emissions on the atmospheric deposition: developments and improvements during three decades of studies

2022

Volcanic emissions are an important source of gases and particles to the atmosphere. Mount Etna discharges a permanent volcanic plume consisting of water vapor and gaseous species (CO2, SO2, HCl and HF, mainly), metals, acid droplets, and solid particles. This plume interacts with meteoric water during precipitations events, so the chemical signature of the plume is impressed on the rainwater. Over the past 32 years, the impact of Etna's emissions on atmospheric deposition has been investigated in many research projects by our team. Sampling methodologies and analytical procedures have been improved over the years. The first study of the concentration of water-soluble inorganic ions in week…

volcanic emissions atmospheric deposition trace metals isotopes Mt. EtnaSettore GEO/08 - Geochimica E Vulcanologia
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The impact of various cations on the sorption of manganese in the thallus of freshwater algae Spirogyra sp. and sea algae Palmaria palmata

2014

Glony ze względu na występowanie w bardzo zróżnicowanych warunkach i dużą odporność na czynniki fizykochemiczne należą do pionierów zasiedlających nowe środowiska, a ich właściwości sorpcyjne są wykorzystywane w biomonitoringu i remediacji wód. Wydajność procesu sorpcji metali ciężkich na glonach wykorzystywanych do badań in situ uzależniona jest od czynników abiotycznych, m.in. od składu chemicznego wody. Do badań wykorzystano słodkowodne glony Spirogyra sp., które w warunkach laboratoryjnych eksponowano w roztworach chlorku manganu o różnym udziale innych kationów, m.in. metali ciężkich i makroelementów. Wykazano, że niektóre metale ciężkie mogą desorbować mangan związany powierzchniowo n…

wymiana jonowametale ciężkiecompetitiveness of sorptionSpirogyra sp.Palmaria palmatakonkurencyjność sorpcjiion exchangeheavy metalsEcological Chemistry and Engineering. S = Chemia i Inżynieria Ekologiczna. S
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Kompleksy metali z czterodonorowymi zasadami Schiffa

2008

zasada Schiffakompleksy metali przejściowychkoordynacja
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Zastosowanie badań biomonitoringowych do oceny zanieczyszczenia metalami ciężkimi wybranych ekosystemów

2016

Celem przeprowadzonych badań był biomonitoring zanieczyszczenia wybranymi metalami ciężkimi: Mn, Fe, Cu, Zn, Cd, Ni i Pb terenu w pobliżu zbiornika Janów (woj. świętokrzyskie) oraz wody w niecce zbiornika. Metale ciężkie w matrycach środowiskowych, takich jak glony Palmaria palmata, mchy Pleurozium schreberi i gleba, oznaczano metodą absorpcyjnej spektrometrii atomowej. Na podstawie przeprowadzonych badań i wyznaczonych współczynników akumulacji względnej (RAF) dla eksponowanych próbek glonów wykazano niejednorodne zanieczyszczenie wód zbiornika, szczególnie miedzią i kadmem. Wartości RAF dla tych metali wynosiły odpowiednio od 0,08 do 0,51 i od 0,17 do 0,91. W nielicznych miejscach pomiaro…

zbiornik JanówJanow water reservoirmetale ciężkiePleurozium schreberi mossesbiomonitoringwspółczynnik akumulacji względnej RAFmchy Pleurozium schreberirelative accumulation factor RAFglebamarine algae Palmaria palmataglony morskie Palmaria palmataheavy metalssoilProceedings of ECOpole
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Biodegradable Metal-Organic Framework-Based Microrobots (MOFBOTs).

2020

Microrobots and metal–organic frameworks (MOFs) have been identified as promising carriers for drug delivery applications. While clinical applications of microrobots are limited by their low drug loading efficiencies and the poor degradability of the materials used for their fabrication, MOFs lack motility and targeted drug delivery capabilities. The combination of these two fields marks the beginning of a new era; MOF‐based small‐scale robots (MOFBOTs) for biomedical applications. Yet, biodegradability is a major hurdle in the field of micro‐ and nanoswimmers including small‐scale robots. Here, a highly integrated MOFBOT that is able to realize magnetic locomotion, drug delivery, and selec…

zeolitic imidazolate frameworksMaterials scienceBiomedical EngineeringPharmaceutical ScienceNanotechnology02 engineering and technology010402 general chemistrybiodegradation01 natural sciencesBiomaterialsmetal–organic frameworksDrug Delivery SystemsNeoplasmsHumansMetal-Organic FrameworksBiodegradable metal021001 nanoscience & nanotechnologyControlled release0104 chemical sciencesMagnetic FieldsTargeted drug deliverySelective degradationDoxorubicindrug deliveryDrug deliverybiodegradation; drug delivery; metal–organic frameworks; microrobots; zeolitic imidazolate frameworksChemotherapeutic drugs0210 nano-technologymicrorobotsAdvanced healthcare materials
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Zanieczyszczenie metalami ciężkimi Matricaria chamomilla L. i Plantago lanceolata L

2019

Celem badań była ocena zanieczyszczenia metalami ciężkimi (Mn, Fe, Ni, Cu, Zn, Cd i Pb) rumianku lekarskiego (Matricaria chamomilla L.) i babki lancetowatej (Plantago lanceolata L.). W ramach biomonitoringu pasywnego pobrano próbki roślin leczniczych oraz próbki gleby, na której rosły rośliny. Metale ciężkie oznaczono za pomocą absorpcyjnej spektrometrii atomowej (AAS). Na podstawie przeprowadzonych badań można stwierdzić, że zioła wykorzystane do badań różniły się pod względem stężeń metali ciężkich w zależności od miejsca ich pobierania. Wszystkie próbki ziół były zanieczyszczone wysokimi stężeniami manganu, żelaza oraz cynku. Badane próbki gleb z grupy B i C według rozporządzenia ministr…

ziołametale ciężkiefitokumulacjaphytocumulationherbsheavy metalsatomic absorption spectrometryabsorpcyjna spektrometria atomowaProceedings of ECOpole
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Does differential iron supply to algae affect Daphnia life history? : An ionome-wide study

2019

The availability of iron (Fe) varies considerably among diet items, as well as ecosystems. Availability of Fe has also changed due to anthropogenic environmental changes in oceanic as well as inland ecosystems. We know little about its role in the nutrition of ecologically important consumers, particularly in inland ecosystems. Physiological studies in several taxa indicate marked effects of dietary Fe on oogenesis. We predicted that differential Fe supply to algae will impact algal Fe concentration with consequences on the life history of the freshwater grazer, Daphnia magna. We found that algal Fe concentration increased with Fe supply, but did not affect algal growth, indicating that the…

zooplanktonecological stoichiometrynutrient limitationfungiplanktontrace metalsrautalisääntyminenreproductionravintovesikirputionomicsnutrient balance conceptravintoaineet
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Bronze of the Living, Bronze of the Dead

2023

In the area considered here, the funerary goods found in burials dating from the Late MBA to the beginning of the LBA (Bz C2 to Ha A1) are particularly rich, with a variety of bronze objects such as ornaments, clothing accessories, tools and weapons. Contemporary settlements only occasionally provide “lost” metal objects and deposits on land or in rivers remain rare. Is it possible from the objects found in excavated contexts (burials, settlements, hoards) alone to evaluate the bronze that circulated during the Late Bronze Age? How representative are the objects in these contexts of bronze production and do they really indicate the metal held within economic exchange networks? How can we de…

étape ancienne du Bronze final[SHS.ARCHEO] Humanities and Social Sciences/Archaeology and Prehistorybronze object of the livingbronze des vivantscirculation and consummation of metaldotation personnelle et familialeEarly phase of the Late Bronze Agepersonal and family dotationhoardfermedépôt[SHS] Humanities and Social Sciencescirculation et consommation du métalfarm
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Autobiographical texts written by learners of Catalan as an Additional Language: From formative needs to reflection in the teaching of narrative genr…

2022

In this article we analyse autobiographical narrative texts written by university students studying Catalan as an Additional Language at a CEFR (2020) B1 level. The goal is to analyse the formative needs related to the writing of this genre in order to foster metadiscursive reflection in the classroom that will allow students to improve their written output. To this end, we analyzed a corpus of 39 autobiographies at both the macrotextual level (i.e., rhetorical moves) and the microtextual level (i.e., deictic elements which channel the narrative’s organization). Our results show that the problems that these texts present for students are related to awareness of the elements that define the …

“UNESCO:CIENCIAS DE LAS ARTES Y LAS LETRAS”Linguistics and Languageattività metalinguisticaDeixisMetadiscursive reflectionGèneres autoreferencialsscritturaCatalà com a llengua addicionalvalency grammarDiscourse competenceNecessitats formativesarticoliCatalan as Additional Languagegrammatica valenzialemetalinguistic awarenesswritingDixiLanguage and LinguisticspragmaticaReflexió metadiscursivaarticlesFormative needspragmaticsSelf-referential genresCompetència discursivaCaplletra. Revista Internacional de Filologia
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