13 research outputs found
Association of Lipidome Remodeling in the Adipocyte Membrane with Acquired Obesity in Humans
The authors describe a new approach to studying cellular lipid profiles and
propose a compensatory mechanism that may help maintain the normal membrane
function of adipocytes in the context of obesity
Application of The New Shape Crushing Plate in Machine Crushing Processes
The results of studies of the crushing process in a double toggle jaw crusher are presented. This process was carried out on six sets of crushing plates. The first three of them are used in industrial crushers â plates with a flat working surface and a triangular profile (in this work, under consideration were profiles with teeth angle Îł = 90°). The fourth and fifth type refer to plates with a variable pitch t and teeth height with a triangular shape of the teeth. In the sixth solution, plates with variable pitch and width of the wedged teeth are proposed
Application of The New Shape Crushing Plate in Machine Crushing Processes
The results of studies of the crushing process in a double toggle jaw crusher are presented. This process was carried out on six sets of crushing plates. The first three of them are used in industrial crushers â plates with a flat working surface and a triangular profile (in this work, under consideration were profiles with teeth angle Îł = 90°). The fourth and fifth type refer to plates with a variable pitch t and teeth height with a triangular shape of the teeth. In the sixth solution, plates with variable pitch and width of the wedged teeth are proposed. The results of the basic process parameters are shown, that is, average degree of fineness n, technical performance Wt, crushing energy L and crushing force F, sieve analysis of crushing product. The obtained results are the basis for the assessment of the suitability of various types of plates, especially plates with a new profile, which have an altered shape in comparison with the plates used in crushers so far. The crushing tests were carried out with the same dimension of outlet slot er = 24 mm, close to the pitch size for plates with triangular profile. Tests were performed on the "Mucharz" sandstone. Samples from a series of blocks of different size and geometric shape were prepared. This work also presents feed mass influence on crushing process efficiency. The plates with variable pitch and width of teeth are beneficial because of lower crushing force and energy
History and operation of the Polish Fireball Network
The Polish Fireball Network (PFN) is a project to monitor regularly the sky over Poland in order to detect bright fireballs. In 2016 the 72 PFN cameras recorded 100 389 meteor events. Using these data and the UFOOrbit software 19 087 trajectories and orbits were calculated. In the following years we are planning intensive modernization of the PFN network including installation of dozens of new digital cameras.Polish Fireball Network (PFN) to projekt polegajÄ
cy na regularnym monitorowaniu nieba nad PolskÄ
w celu zaobserwowania jasnych meteorĂłw i bolidĂłw. W 2016 roku 72 kamery PFN zarejestrowaĹy 100 389 meteorĂłw. Za pomocÄ
tych danych i oprogramowania UFOOrbit obliczono 19 087 trajektorie i orbity. W kolejnych latach planujemy intensywnÄ
modernizacjÄ sieci PFN, w tym instalacjÄ kilkudziesiÄciu nowych kamer cyfrowych
Refined OPLS All-Atom Force Field for Saturated Phosphatidylcholine Bilayers at Full Hydration
We
report parametrization of dipalmitoyl-phosphatidylcholine (DPPC)
in the framework of the Optimized Parameters for Liquid Simulations
all-atom (OPLS-AA) force field. We chose DPPC as it is one of the
most studied phospholipid species and thus has plenty of experimental
data necessary for model validation, and it is also one of the highly important and abundant
lipid types, e.g., in lung surfactant. Overall, PCs have not been
previously parametrized in the OPLS-AA force field; thus, there is
a need to derive its bonding and nonbonding parameters for both the
polar and nonpolar parts of the molecule. In the present study, we
determined the parameters for torsion angles in the phosphatidylcholine
and glycerol moieties and in the acyl chains, as well the partial
atomic charges. In these calculations, we used three methods: (1)
HartreeâFock (HF), (2) second order MøllerâPlesset
perturbation theory (MP2), and (3) density functional theory (DFT).
We also tested the effect of the polar environment by using the polarizable
continuum model (PCM), and for acyl chains the van der Waals parameters
were also adjusted. In effect, six parameter sets were generated and
tested on a DPPC bilayer. Out of these six sets, only one was found
to be able to satisfactorily reproduce experimental data for the lipid
bilayer. The successful DPPC model was obtained from MP2 calculations
in an implicit polar environment (PCM)
Refined OPLS All-Atom Force Field for Saturated Phosphatidylcholine Bilayers at Full Hydration
We
report parametrization of dipalmitoyl-phosphatidylcholine (DPPC)
in the framework of the Optimized Parameters for Liquid Simulations
all-atom (OPLS-AA) force field. We chose DPPC as it is one of the
most studied phospholipid species and thus has plenty of experimental
data necessary for model validation, and it is also one of the highly important and abundant
lipid types, e.g., in lung surfactant. Overall, PCs have not been
previously parametrized in the OPLS-AA force field; thus, there is
a need to derive its bonding and nonbonding parameters for both the
polar and nonpolar parts of the molecule. In the present study, we
determined the parameters for torsion angles in the phosphatidylcholine
and glycerol moieties and in the acyl chains, as well the partial
atomic charges. In these calculations, we used three methods: (1)
HartreeâFock (HF), (2) second order MøllerâPlesset
perturbation theory (MP2), and (3) density functional theory (DFT).
We also tested the effect of the polar environment by using the polarizable
continuum model (PCM), and for acyl chains the van der Waals parameters
were also adjusted. In effect, six parameter sets were generated and
tested on a DPPC bilayer. Out of these six sets, only one was found
to be able to satisfactorily reproduce experimental data for the lipid
bilayer. The successful DPPC model was obtained from MP2 calculations
in an implicit polar environment (PCM)
Increased Aluminum Content in Certain Brain Structures is Correlated with Higher Silicon Concentration in Alcoholic Use Disorder
Introduction: Alcohol overuse may be related to increased aluminum (Al) exposure, the brain accumulation of which contributes to dementia. However, some reports indicate that silicon (Si) may have a protective role over Al-induced toxicity. Still, no study has ever explored the brain content of Al and Si in alcoholic use disorder (AUD). Materials and methods: To fill this gap, the present study employed inductively coupled plasma optical emission spectrometry to investigate levels of Al and Si in 10 brain regions and in the liver of AUD patients (n = 31) and control (n = 32) post-mortem. Results: Al content was detected only in AUD patients at mean ± SD total brain content of 1.59 ± 1.19 mg/kg, with the highest levels in the thalamus (4.05 ± 12.7 mg/kg, FTH), inferior longitudinal fasciculus (3.48 ± 9.67 mg/kg, ILF), insula (2.41 ± 4.10 mg/kg) and superior longitudinal fasciculus (1.08 ± 2.30 mg/kg). Si content displayed no difference between AUD and control, except for FTH. Positive inter-region correlations between the content of both elements were identified in the cingulate cortex, hippocampus, and ILF. Conclusions: The findings of this study suggest that AUD patients may potentially be prone to Al-induced neurodegeneration in their brain—although this hypothesis requires further exploration