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Concentric double hollow grid cathode discharges. Spectral investigations and phenomenological approach
Get PDFA discharge plasma is created by simultaneously biasing two concentric spherical grids with
axisymmetric orifices. In this geometry, space charge structures in the form of multiple
quasi-spherical luminous plasma bodies appear simultaneously inside and around the
cathodes. The plasma formations are highly interdependent supplying each other with the
particle flow and current closure necessary for the maintenance of the discharge. To diagnose
these structures, space-resolved cold Langmuir probe measurements and optical emission
spectroscopy investigations were performed in the axial direction allowing for the mapping of
the axial profiles of plasma potential, electron temperature and density, ion density and optical
emission. The existence of an accelerating double layer in the vicinity of the holes has been
confirmed here, and in previous research (Teodorescu-Soare C T et al 2016 Phys. Scr. 91
034002; Schrittwieser R W et al 2017 Phys. Scr. 92 044001; Teodorescu-Soare C T et al 2019
Int. J. Mass Spectrom. 436 83). Besides the assessment of the relationship between discharge
conditions and plasma parameters in the novel cathode system, the importance of a multiple
concentric cathode discharge configuration is revealed for deposition applications
Development of histamine reinforced poly(vinyl alcohol)/chitosan blended films for potential biomedical applications
No full textPoly(vinyl alcohol) (PVA)/chitosan (CS) blends represent one of the most studied bicomponent systems constituted between a natural biomacromolecule and an easily biodegradable synthetic polymer. Yet, in order to control and improve the physical, hydrolytic, and mechanical stability of these systems, by adding safe linkers to bind the free hydrophilic groups, there is much work to be done. In the present work, histamine (H) reinforced PVA/CS tri-components blended films have been developed via casting from solution technique. Before casting, rheology measurements were conducted on the studied solutions, then, all the PVA/CS/H matrices were subjected to FTIR studies, scanning electron microscopy, contact angle, water absorption capacity, surface roughness measurements, antimicrobial, and in-vitro biocompatibility studies. Results of the morphological studies showed that pores were uniformly dispersed on the matrix while the surface roughness increased in the films when a higher ratio of histamine was used. The studies revealed significant enhancement in the water absorption capacity of the histamine reinforced blends compared with the pristine PVA/CS film. Cellular behavior studies performed on epithelial (MCF line 7) cells revealed comparable proliferative and adhesion activity of tri-component PVA/CS/H films compared to that of pristine PVA/CS films.European Regional Development Fun
Predictive value of comorbid conditions for COVID-19 mortality
Get PDFIn this paper, we aim at understanding the broad spectrum of factors influencing the survival of infected patients and the correlations between these factors to create a predictive probabilistic score for surviving the COVID-19 disease. Initially, 510 hospital admissions were counted in the study, out of which 310 patients did not survive. A prediction model was developed based on this data by using a Bayesian approach. Following the data collection process for the development study, the second cohort of patients totaling 541 was built to validate the risk matrix previously created. The final model has an area under the curve of 0.773 and predicts the mortality risk of SARS-CoV-2 infection based on nine disease groups while considering the gender and age of the patient as distinct risk groups. To ease medical workers’ assessment of patients, we created a visual risk matrix based on a probabilistic model, ranging from a score of 1 (very low mortality risk) to 5 (very high mortality risk). Each score comprises a correlation between existing comorbid conditions, the number of comorbid conditions, gender, and age group category. This clinical model can be generalized in a hospital context and can be used to identify patients at high risk for whom immediate intervention might be required
Long Term Evaluation of Biodegradation and Biocompatibility In-Vivo the Mg-0.5Ca-xZr Alloys in Rats
No full textBiodegradable alloys in Mg have the advantages of traditional metallic materials and those of biodegradable polymers with superior strength, lower density and ideal rigidity for fixing bone fractures. The biocompatibility and biodegradability of the five concentrations of Mg-0.5Ca-xZr alloys used were assessed using clinical and laboratory examinations that followed over time: tissue reaction, histological and imaging (RX, CT and SEM) evolution at 1, 2, 4 and 8 weeks after implant. The main purpose of this study was to investigate in vivo the long-term effect of Mg-0.5Ca-xZr alloys in rats. The results confirmed that Mg-0.5Ca-xZr alloys are biocompatible and biodegradable and are recommended to be used as possible materials for new orthopedics devices
Phylogenetic relationships and genetic diversity of endangered romanian cattle breeds, Grey Steppe and Pinzgau
No full textInvestigații micologice privind flora dominantă din substraturile vegetale recoltate din N-E României
Get PDFThe research aimed to evaluate the fungal potential of plant substrates that frequently enter the food of animals and humans through a mycological screening of collected samples that characterize N-E Romania. Samples such as alfalfa semi-hay, corn silo, mixed feed ration, concentrates, corn grains were randomly collected from agricultural or zootechnical farms and a series of 30 determinations/sample were performed, in in order to establish the fungal load during the experimental period. The double agar serial dilution technique and bacterial inhibitors were used to establish the number of colony-forming units, with an emphasis on the isolation, identification and characterization of micromycete species, in view of their taxonomic classification. Following the study, it was shown that the dominant fungal flora that characterizes the plant substrates in N-E Romania belongs to the genera Penicillium (99.9%), Fusarium (89.6%) and Aspergillus (73%), the most contaminated samples being represented by the corn silo and the corn grains. The climatic conditions in this geographical area are favorable for these species of micromycetes, they develop a vigorous vegetative apparatus with a phenotypic expression difficult to confuse and easy to frame taxonomically
Polyel – compound with antioxidant properties
No full textA new complex compound,
Polyel, which contains thiourea, macroand
microelements in the form of salts and
coordination complexes, as well as
vitamins, was obtained and tested.
Biological tests were performed in
laboratory experiments and in the
vegetation complex of the Institute of
Genetics, Physiology and Plant Protection.
As subjects of investigations served the
plants Glycine max (Merr) cultivars L.
‘Deia’, ‘Moldovița’, and ‘Enigma’
varieties, grown in the Mitcherlih
vegetation pots with a volume of 40 kg
soil and exposed to the drought stress at
the phase "flowering - pods formation”.
The beneficial effect of Polyel on
antioxidant protection systems by reducing
the accumulation of malondialdehyde
(MDA) and intensifying the activity of
antioxidant protection enzymes has been
established. Polyel has been shown to be
one of the new biologically active
chemicals that can be used in agriculture
to reduce the negative impact of oxidative
stress caused by reactive oxygen species
(ROS). The use of Polyel as a
physiologically active substance (PAS)
with antioxidant proprieties for pretreatment
of seeds and foliar apparatus is
much more effective under moderate
drought conditions