Search results for "Spect"
showing 10 items of 28650 documents
Assessment of microalgae species, biomass, and distribution from spectral images using a convolution neural network
2022
AbstractEffective monitoring of microalgae growth is crucial for environmental observation, while the applications of this monitoring could also be expanded to commercial and research-focused microalgae cultivation. Currently, the distinctive optical properties of different microalgae groups are targeted for monitoring. Since different microalgae can grow together, their spectral signals are mixed with ambient properties, making estimations of species biomasses a challenging task. In this study, we cultured five different microalgae and monitored their growth with a mobile spectral imager in three separate experiments. We trained and validated a one-dimensional convolution neural network by…
International Society for Extracellular Vesicles: first annual meeting, April 17-21, 2012: ISEV-2012
2012
Extracellular micro- and nano-scale membrane vesicles produced by different cells are recognized as an essential entity of physiological fluids in a variety of organisms and function as mediators of intercellular communication employed for the regulation of multiple systemic and local processes. In the last decade, an exponential amount of experimental work was dedicated to exploring the biogenesis and secretion mechanisms, physiological and pathological functions and potential applications of the extracellular vesicles (EVs). Noteworthy is the large heterogeneity of in vitro and in vivo models applied, technical approaches developed in these studies and the diversity of designations assign…
Determination of metal concentrations in certified plastic reference materials after small-size autoclave and microwave-assisted digestion followed w…
2017
Abstract The digestion methods for the determination of As, Cd, Cr, Pb, Sb, Sn and Zn concentrations in plastic samples using microwave-assisted digestion (MW-AD) and small-size autoclave digestion was developed. The certified polyethylene, polypropylene, polyvinyl chloride and acrylonitrile butadiene styrene certified reference materials were used in order to find digestion method working properly for several sample matrices. Efficiency of the digestion methods was evaluated by analyzing the residual carbon in digests by TOC analyzer. MW-AD using a mixture of 7 mL of HNO 3 and 3 mL of H 2 O 2 as a digestion solution resulted in excellent recoveries for As, Cd, Pb, Sb and Zn, and were in th…
Desarrollo de nuevas estrategias analíticas basadas en la espectrometría de masas para la determinación de contaminantes procedentes de la migración …
2019
Esta Tesis Doctoral tiene como objetivo principal el desarrollo de nuevas metodologías analíticas adecuadas para el análisis de contaminantes orgánicos procedentes de los materiales destinados a entrar en contacto con los alimentos, mediante la utilización de la cromatografía líquida acoplada a la espectrometría de masas. Además, se ha utilizado la biomonitorización humana para evaluar la exposición y el riesgo de una población de mujeres lactantes a distintos contaminantes procedentes de envases plásticos.En la introducción de la tesis se ha realizado una revisión crítica del estado actual de las metodologías analíticas para la determinación de contaminantes derivados de los materiales. Lo…
Learning, teaching and integration of adult migrants in Finland
2017
Learning a new vocation or re-learning one that was previously mastered is considered one of the essential pathways for migrant integration into the Finnish labour market. Thus, vocational educators should have competencies that support teaching adults with diverse educational, vocational, cultural, and linguistic backgrounds, and enhance their participation in the learning community. This research examines learning, teaching, and integration of adult migrants in Finland. The study analyses what educators and adult migrant students focus on when talking about learning and teaching. First, the aim was to gain an understanding of the core aspects that trainers and migrant students refer to wh…
The determination of trace element concentrations in fly ash samples using ultrasound-assisted digestion followed with inductively coupled plasma opt…
2009
A method of ultrasound-assisted digestion followed by inductively coupled plasma optical emission spectrometry (ICP-OES) used for the determination of trace element (chromium, copper, lead, nickel, vanadium and zinc) concentrations in fly ash samples was developed. All the measurements were performed in robust plasma conditions. Ultrasound-assisted digestion procedures using digestion solutions of aqua regia and hydrofluoric acid (HF) resulted in recovery rates of over 80% for all the analyte elements. Ultrasound-assisted two-step digestion with digestion solutions of 6 mL of HNO₃(Step 1) and 3 mL of HNO₃+ 3 mL of HF (Step 2) resulted in recovery rates of over 92% for all the analyte elemen…
An ultrasound-assisted digestion method for the determination of toxic element concentrations in ash samples by inductively coupled plasma optical em…
2007
method of ultrasound-assisted digestion followed by inductively coupled plasma optical emission spectrometry (ICP-OES) used for the determination of toxic element concentrations (arsenic, barium, cobalt, copper, lead, nickel, strontium, vanadium and zinc) in ash samples was developed. All the measurements were performed in robust plasma conditions which were tested by measuring the Mg(II) 280.270 nm/Mg(I) 285.213 nm line intensity ratios. The highest line intensity ratios were observed when a nebulizer gas flow of 0.6 L minˉ¹, auxiliary gas flow of 0.2 L minˉ¹ and plasma power of 1400 W were used for radially viewed plasma. The analysis of SRM 1633b showed that the ultrasound-assisted metho…
Breast-Feeding from an Evolutionary Perspective.
2021
Lactation is the most critical period of mammal feeding given the compulsory dependence on milk of the offspring during a more or less extensive period following birth. This has also been the case for the human species until relatively recent times when heterologous milk processing has allowed the alternative of artificial lactation. The advantages and disadvantages of natural and artificial lactation (formula) have been widely discussed from the biological, psychological and cultural perspectives, without reaching a general agreement among the breastfeeding women themselves or among the health professionals concerned. On the subject of breastfeeding, the information available is enormous b…
Differentiation among dairy products by combination of fast field cycling NMR relaxometry data and chemometrics
2021
A set of commercial milk and Sicilian cheeses was analysed by a combination of fast field cycling (FFC) nuclear magnetic resonance (NMR) relaxometry and chemometrics. The NMR dispersion (NMRD) curves were successfully analysed with a mathematical model applied on Parmigiano-Reggiano (PR) cheese. Regression parameters were led back to the molecular components of cheeses (water trapped in casein micelles, proteins and fats) and milk samples (water belonging to hydration shells around dispersed colloidal particles of different sizes and bulk water). The application of chemometric analysis on relaxometric data enabled differentiating milk from cheeses and revealing differences within the two sa…
Programa de Intervención temprana en la relación parental en niños/as con TEA
2022
Resumen tesis doctoral La presente tesis es resultado de un compendio de artículos científicos, artículos que fueron aceptados y publicados en revistas de impacto. Esta tesis está dividida en 4 capítulos, los cuales hacen alusión a tres artículos científicos y un capítulo de un libro. El objetivo de esta tesis doctoral fue determinar la importancia de las metodologías de intervención temprana en el tratamiento de niños y niñas autistas y la participación activa de los padres dentro del proceso terapéutico, como consecuencia a este objetivo inicial surgió la importancia de investigar e incorporar modelos de intervención para el tratamiento de la ansiedad parental causada por la crianza de ni…