Search results for "TRACE"

The effects of heart rate variability and cardiac cycle time on learning in trace eye-blink conditioning

2017

Ärsykkeen sydämen sykkeeseen ajastamisella on huomattu olevan yhteyttä sensoriseen havainnointiin ja korkeampaan kognitiiviseen prosessointiin, kun sykevälivaihtelu (HRV)puolestaan on yhdistetty tarkkaavaisuuteen. Tässä tutkimuksessa tarkasteltiin sykevälivaihtelun sekä ärsykkeen sydämen sykkeeseen ajastamisen yhteyksiä oppimiseen. Koehenkilöt osallistuivat silmäniskuehdollistumiskokeeseen, missä ärsykkeet oli ajastettu joko sydämen sykkeen systoliseen tai diastoliseen vaiheeseen. HRV:n ja EEG:n mittaaminen aloitettiin viisi minuuttia ennen kokeen alkua ja sitä jatkettiin viisi minuuttia kokeen loppumisen jälkeen. Tutkimuksessa tarkasteltiin kuutta HRV-muuttujaa: sykevälin keskiarvo (MRR), …

The cycle of major and trace elements in a volcanic environment

2010

Atmospheric Deposition Of Volcanogenic Major And Trace Elements On Mt. Etna (Italy)

2009

There are a variety of natural and anthropogenic sources of trace elements into the environment, and human activity has drastically changed the biogeochemical cycles and balance of several elements. In the last twenty years many efforts have been spent by the scientific community to better outline the levels of pollutants in the environment on a long-term basis, and to evaluate global large-scale changes. It is generally accepted that volcanic emissions are an important source of gases and particles to the atmosphere, contributing significantly to the natural geochemical cycles of all elements (Nriagu, 1989; Hinkley et al., 1999; Oppenheimer, 2003). Many studies have been carried out on the…

Trace elements in thermomineral waters in Greece

2020

Trace elements have a fundamental role in natural and anthropogenic systems. In waters, they present a great variability of concentrations that mostly depends on the degree of gas-water-rock interactions and geochemical conditions such as pH, temperature, redox and/or exchange reactions, etc. Even though, they are present in very low contents in host-rocks, elevated concentrations in ground or surface waters may have a hazardous impact on human health and thus, it is important to both quantify and understand their behavior in natural systems. Here we present the results of about 300 cold and thermal mineral waters collected along the entire Hellenic territory. Physicochemical parameters (te…

A literature review and new data of trace metals fluxes from worldwide active volcanoes

2012

Sand clams of Ganzirri marine coastal lagoon in Messina (Italy). Extraction and ICP-MS analysis

2008

This paper studies the possible forms or phases of heavy metals in sediments of a marine coastal lagoon, called Ganzirri, located in the Sicilian coast of the Messina’s strait by using sequential extraction. To reduce the extraction time of the Tessier method, the last step of speciation was carried out by mineralization in a microwave oven. Here we report the results of the distribution of As, Be, Cd, Co, Cr, Cu, Mo, Ni, Pb, Sb, Se, Tl, V and Zn, in four fractions of sediments samples and the concentration of the same metals in clams. This study looked at three bivalve mollusc species, Tapes decussates, Chamelea gallina and Cardium edule, raised in the sediment considered and discussed the…

The effect of hypothalamic stimulation during trace conditioning in rabbits

2001

Extracellular Vesicle microRNAs Contribute to the Osteogenic Inhibition of Mesenchymal Stem Cells in Multiple Myeloma

2020

Osteolytic bone disease is the major complication associated with the progression of multiple myeloma (MM). Recently, extracellular vesicles (EVs) have emerged as mediators of MM-associated bone disease by inhibiting the osteogenic differentiation of human mesenchymal stem cells (hMSCs). Here, we investigated a correlation between the EV-mediated osteogenic inhibition and MM vesicle content, focusing on miRNAs. By the use of a MicroRNA Card, we identified a pool of miRNAs, highly expressed in EVs, from MM cell line (MM1.S EVs), expression of which was confirmed in EVs from bone marrow (BM) plasma of patients affected by smoldering myeloma (SMM) and MM. Notably,we found that miR-129-5p, whic…

Tumor-derived exosomes as factors that promote metastatic niche formation: evaluation of the effects induced by colon cancer derived exosomes on func…

2023

Monitoring Volcanic Eruptions Using Trace Metals In Tree-Rings: Preliminary Results From Mt. Etna

2010

8. Active volcanoes can influence surrounding vegetation both through passive degassing during quiescent periods and through eruptive degassing, by introducing into the atmosphere several metals as gases and particles. The chemical composition of tree-rings has been generally used to investigate the effects of anthropogenic gas emissions and dendrochemical methods have successfully recorded variations in the pollution levels. The use of tree-rings analysis in active volcanic areas has shown that vascular plants could be used as archives of volcanogenic metals deposition. Tree cores of Pinus Nigra and Populus tremula were collected in sites located both on the downwind (Citelli and Mt. Fonta…