Search results for "PERT"

Past, Present and Future Perspectives on Halloysite Clay Minerals

2020

Halloysite nanotubes (HNTs), clay minerals belonging to the kaolin groups, are emerging nanomaterials which have attracted the attention of the scientific community due to their interesting features, such as low-cost, availability and biocompatibility. In addition, their large surface area and tubular structure have led to HNTs’ application in different industrial purposes. This review reports a comprehensive overview of the historical background of HNT utilization in the last 20 years. In particular it will focus on the functionalization of the surfaces, both supramolecular and covalent, following applications in several fields, including biomedicine, environmental science and catalysis.

In Reply – Association of Renin Angiotensin System Blockers with Outcomes in Patients With COVID-19

2020

Why reg. (eu) no. 1103/2016 and 1104/2016 impact on the european citizens daily life?

2021

Why families do need the tools and instruments implemented by PSEFS Project? Why this is not an issue for lawyers, judges and University professors only. The answer to this question is that Reg. (EU) no. 1103/2016 and no. 1104/2016 impact on the European citizens daily life. We follow the problems of a young couple in order to have a better understanding and an evidence of this statement.

Double Flow Bioreactor for In Vitro Test of Drug Delivery.

2015

In this work, double-structured polymeric scaffolds were produced, and a double flow bioreactor was designed and set up in order to create a novel system to carry out advanced in vitro drug delivery tests. The scaffolds, consisting of a cylindrical porous matrix, are able to host cells, thus mimicking a three-dimensional tumor mass: moreover, a “pseudo-vascular” structure was embedded into the matrix, with the aim of allowing a flow circulation. The structure that emulates a blood vessel is a porous tubular-shaped scaffold prepared by Diffusion Induced Phase Separation (DIPS), with an internal lumen of 2 mm and a wall thickness of 200 micrometers. The as-prepared vessel was incorporated…

“Twin” phosphorous atoms of tetraethyl 2-methyl-piperyd-1-ylmethylenebisphosphonates

2007

Recently, bisaminophosphonates found applications as therapeutic agents for curing bone disorders. When trying to relate the structures of substituted piperid-1-ylmethylenebisphosphonic with their biological properties, non-typical findings that in 31P NMR spectra of 2-methyl-piperid-1-ylmethylenebisphosphonic and 2-ethyl-piperid-1-ylmethylenebisphosphonic acids, two separate singlets from each of the phosphonic groups were observed, while their analogues bearing substituent in position 3 exhibit only one signal. Their presence was explained by freezing of the molecular motions by strong hydrogen bonding between NH and P = O atoms. In this work, synthesis as well as spectroscopic and theore…

Prueba de Perthes

2010

Prueba de Perthes como prueba funcional en la valoración del sistema venoso.

3D printeru apkalpojošā personāla ķīmiskie un fizikālie darba vides riski

2018

“3D drukāšanas iekārtu apkalpojošā personāla ķīmiskie un fizikālie darba vides riski”. Darba autore: Anete Bušmane. Zinātniskā vadītāja: Dr.chem. Elīna Pajuste. Darba apjoms ir 64 lpp., tajās ietvertas 9 tabulas, 26 attēli, 1 pielikums un 42 literatūras avoti. 3D drukas nozarē no digitāla formāta tiek izdrukāts reāls un aptaustāms objekts, šī nozare līdz šim maz izpētīta ne tikai Latvijā, bet visā pasaulē. Galvenie faktori uz kuriem tiek vērsta uzmanība zinātniskajos rakstos un pētījumos, ir par nozarē sastopamajiem ķīmiskajiem un fizikālajiem riska faktoriem. Zinātnisko pētījumu šajā jomā nav daudz, un tie kas šobrīd ir pieejami nav ar viennozīmīgu informāciju, Latvijā šī nozare līdz šim n…

Green Composites Based on PLA and Agricultural or Marine Waste Prepared by FDM

2021

Three dimensional-printability of green composites is recently growing in importance and interest, especially in the view of feasibility to valorize agricultural and marine waste to attain green fillers capable of reducing bioplastic costs, without compromising their processability and performance from an environmental and mechanical standpoint. In this work, two lignocellulosic fillers, obtained from Opuntia ficus indica and Posidonia oceanica, were added to PLA and processed by FDM. Among the 3D printed biocomposites investigated, slight differences could be found in terms of PLA molecular weight and filler aspect ratio. It was shown that it is possible to replace up to 20% of bioplastic …

Non-symmetrized Hyperspherical Harmonics Method for Non-equal Mass Three-Body Systems

2018

The non-symmetrized hyperspherical harmonics method for a three-body system, composed by two particles having equal masses, but different from the mass of the third particle, is reviewed and applied to the $^3$H, $^3$He nuclei and $^3_{\Lambda}$H hyper-nucleus, seen respectively as $nnp$, $ppn$ and $NN\Lambda$ three-body systems. The convergence of the method is first tested in order to estimate its accuracy. Then, the difference of binding energy between $^3$H and $^3$He due to the difference of the proton and the neutron masses is studied using several central spin-independent and spin-dependent potentials. Finally, the $^3_{\Lambda}$H hypernucleus binding energy is calculated using diffe…

Characterization of the Solid State Properties of Anodic Oxides on Magnetron Sputtered Ta, Nb and Ta-Nb Alloys

2012

Tantalum oxide, niobium oxide and Ta-Nb containing mixed oxides were grown by anodizing sputter-deposited Ta, Nb and Ta-Nb alloys of different compositions. A photoelectrochemical investigation was performed in order to estimate the band gap and the flat band potential of the oxides as a function of their composition. The band gap of the investigated Ta-Nb containing mixed oxides changed monotonically between those estimated for Ta2O5 (4.1 eV) and Nb2O5 (3.4 eV) and in agreement with a proposed correlation between the Band gap of an oxide and the difference of electronegativity of the oxide constituents. From the differential capacitance curves recorded in a wide range of electrode potentia…