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Crystal field and magnetism with Wannier functions: rare-earth doped aluminum garnets

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Journal of Rare Earths 2015年第12期33卷 1316-1323页

作者： Eva Mihóková pavel Novák Valentin V.Laguta Institute of Physics Czech Academy of Sciences

Using the recently developed method we calculated the crystal field parameters m yttrium anct lutetium aluminum garnets doped with seven trivalent Krarners rare-earth ions. We then inserted calculated parameters into the atomic-like Hamiltonian taking into account the electron-electron, spin-orbit and Zeeman interactions and determined the multiplet splitting by the crystal field as well as magnetic tensors. We compared calculated results with available experimental data. Very good agreement with the spectroscopic data and qualitative agreement with experimental tensors was found.

关键词： crystal field ab initio calculations gamets rare earths

Zinc phosphate-based nanoparticles as alternatives to zinc oxide in diet of weaned piglets

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Journal of Animal Science and Biotechnology 2020年第4期11卷 1147-1162页

作者： Silvia Kociova Kristyna Dolezelikova pavel Horky Sylvie Skalickova Daria Baholet Lucie Bozdechova Eva Vaclavkova Jaroslava Belkova pavel Nevrkla Jiri Skladanka Tomas Do Ondrej Zitka Yazan Haddad pavel Kopel Ludek Zurek Vojtech Adam Kristyna Smerkova Department of Chemistry and Biochemistry Mendel University in BrnoZemedelska 1CZ-61300 BrnoCzech Republic Central European Institute of Technology Brno University of TechnologyPurkynova 123CZ-61200 BrnoCzech Republic Department of Animal Nutrition and Forage Production Mendel University in BrnoZemedelska 1CZ-61300 BrnoCzech Republic Institute of Animal Science Pratelstvi 815CZ-10400 Praha UhrinevesCzech Republic Department of Animal Breeding Mendel University in BrnoZemedelska 1CZ-61300 BrnoCzech Republic Department of Inorganic Chemistry Faculty of SciencePalacky University17.listopadu 12CZ-77146 OlomoucCzech Republic Central European Institute of Technology Center for ZoonosesUniversity of Veterinary and Pharmaceutical SciencesBrnoPalackeho 1946/1CZ-61242 BrnoCzech Republic.

Background: The high doses of zinc oxide(Zn O) administered orally to piglets for the prevention of diarrhea and increase of growth rate can contaminate pig farms and the surrounding environment. Therefore, there is a need to find a replacement of high doses of dietary Zn O with an equally effective alternative. In the present study, the effect of two formulations of zinc phosphate-based nanoparticles(Zn A and Zn C NPs) on growth performance,intestinal microbiota, antioxidant status, and intestinal and liver morphology was evaluated. A total of 100 weaned piglets were randomly divided into 10 equal groups with the base diet(control) or the base diet supplemented with Zn A, Zn C, or Zn O at concentrations 500, 1000, and 2000 mg Zn per kilogram of diet. Supplements were given to animals for 10 days. Fecal samples were collected on day 0, 5, 10 and 20. At the end of the treatment(day 10),three piglets from each group were sacrificed and ***: Comparing to that of control, the significantly higher piglet weight gain was observed in all piglet groups fed with Zn A(P < 0.05). Differences in the total aerobic bacteria and coliform counts in piglet feces after NPs supplementation compared to that of control and Zn O groups were also found(P < 0.05). The majority of aerobic culturable bacteria from the feces represented Escherichia(28.57–47.62%), Enterococcus(3.85–35.71%), and Streptococcus(3.70–42.31%) spp. A total of 542 Escherichia coli isolates were screened for the virulence genes STa,STb, Stx2, F4, and F18. The substantial occurrence of E. coli virulence factors was found on day 5, mainly in fimbrillary antigen and thermostable toxins, except for piglets fed by Zn C. Zn treatment decreased Zn blood levels in piglets fed with Zn O and Zn A(500 mg/kg) and increased in Zn C(2000 mg/kg) compared to that of control(P < 0.05). The antioxidant status of piglets was affected only by Zn A. While some changes in the liver and the intestinal morphology of piglets with

关键词： Antioxidant status Diet E.coli STa STb Stx2 F4 F18 Fecal coliforms Microbiota

Comparative morphological study of female internal reproductive system among nine species in the genus Tipula(Diptera: Tipulidae)

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Zoological Systematics 2020年第2期45卷 135-145页

作者： Qiulei Men pavel Starkevich Sigitas Podenas School of Life Sciences Provincial Key Laboratory of the Biodiversity Study and Ecology Conservation in Southwest AnhuiAnqing Normal UniversityAnqingAnhui 246011P.R.China Nature Research Centre Akademijos str.2LT-08412 VilniusLithuania

Female internal reproductive systems of nine species in the genus Tipula are described and illustrated,namely T.(Beringotipula)amurensis Alexander,1925,T.(Lunatipula)lunata Linnaeus,1758,T.(Lunatipula)submanca Savchenko,1964,T.(Pterelachisus)biaciculifera Alexander,1937,T.(Sivatipula)parvauricula Alexander,1941,T.(Vestiplex)longitudinalis Nielsen,1929,T.(Vestiplex)sternotuberculata Alexander,1935,T.(Yamatotipula)couckei Tonnoir,1921 and T.(Yamatotipula)marginella Theowald,*** morphological differences of internal reproductive organs for these species are ***,taxonomic potential of some internal reproductive structures are analyzed and discussed.

关键词： Tipula bursa copulatrix spermatheca accessory gland anatomical study

Dopaminergic mediation in the brain aging and neurodegenerative diseases:a role of senescent cells

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Neural Regeneration Research 2018年第4期13卷 649-650页

作者： pavel V.Nekrasov Vasily V.Vorobyov Institute of Cell Biophysics Russian Academy of Sciences

Aging is well known to be the main risk factor for the neurodegenerative pathologies,in particular,Parkinson’s disease（PD）and Alzheimer’s disease（AD）.In aging and in the diseases,similar changes in various hallmarks of neurodegeneration（lipofuscin accumulation,autophagia weakening,and disturbances in functions of mitochondriaand lysosomes） were shown （Tan et al., 2014）. Furthermore, dopami- nergic system （DAS） involvement in mechanisms of aging, PD, and AD were revealed （Martorana and Koch, 2014）.

关键词： Dopaminergic mediation in the brain aging and neurodegenerative diseases:a role of senescent cells

Staggered Lagrangian Discretization Based on Cell-Centered Riemann Solver and Associated Hydrodynamics Scheme

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Communications in Computational Physics 2011年第9期10卷 940-978页

作者： Pierre-Henri Maire Raphael Loubere pavel Vachal CEA-CESTA BP 233114Le BarpFrance Institut de Mathematiques de Toulouse(IMT)Universite Paul-Sabatier and CNRS ToulouseFrance FNSPE Czech Technical University(CTU)in PragueCzech Republic

The aim of the present work is to develop a general formalism to derive staggered discretizations for Lagrangian hydrodynamics on two-dimensional unstructured *** this end,we make use of the compatible discretization that has been initially introduced by *** et al.,in ***.,146(1998).Namely,momentum equation is discretized by means of subcell forces and specific internal energy equation is obtained using total energy *** main contribution of this work lies in the fact that the subcell force is derived invoking Galilean invariance and thermodynamic *** is,we deduce a general form of the sub-cell force so that a cell entropy inequality is *** subcell force writes as a pressure contribution plus a tensorial viscous contribution which is proportional to the difference between the nodal velocity and the cell-centered *** cell-centered velocity is a supplementary degree of freedom that is solved by means of a cell-centered approximate Riemann *** satisfy the second law of thermodynamics,the local subcell tensor involved in the viscous part of the subcell force must be symmetric positive *** subcell tensor is the cornerstone of the *** particular expression of this tensor is given.A high-order extension of this discretization is *** tests are presented in order to assess the efficiency of this *** results obtained for various representative configurations of one and two-dimensional compressible fluid flows show the robustness and the accuracy of this scheme.

关键词： Lagrangian scheme Riemann solver artificial viscosity hydrodynamics compressible flow

FOLFOX/FOLFIRI pharmacogenetics:The call for a personalized approach in colorectal cancer therapy

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World Journal of Gastroenterology 2014年第30期20卷 10316-10330页

作者： Beatrice Mohelnikova-Duchonova Bohuslav Melichar pavel Soucek Department of Toxicogenomics National Institute of Public Health10042 PragueCzech Republic Department of Oncology Palacky University Medical School and Teaching Hospital77525 OlomoucCzech Republic

While 5-fluorouracil used as single agent in patients with metastatic colorectal cancer has an objective response rate around 20%,the administration of combinations of irinotecan with 5-fluorouracil/folinic acid or oxaliplatin with 5-fluorouracil/folinic acid results in significantly increased response rates and improved ***,the side effects of systemic therapy such as myelotoxicity,neurotoxicity or gastrointestinal toxicity may lead to life-threatening complications and have a major impact on the quality of life of the ***,biomarkers that would be instrumental in the choice of optimal type,combination and dose of drugs for an individual patient are urgently *** efficacy and toxicity of anticancer drugs in tumor cells is determined by the effective concentration in tumor cells,healthy tissues and by the presence and quantity of the drug *** active in drug metabolism and transport represent important determinants of the therapeutic *** aim of this review was to summarize published data on associations of gene and protein expression,and genetic variability of putative biomarkers with response to therapy of colorectal cancer to 5-fluorouracil/leucovorin/oxaliplatin and 5-fluorouracil/leukovorin/irinotecan *** in the knowledge identified by this review may aid the design of future research and clinical trials.

关键词： Colorectal cancer Chemotherapy 5-Fluorouracil Oxaliplatin Irinotecan

Fluoride solid electrolytes containing rare earth elements

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Journal of Rare Earths 2008年第2期26卷 225-232页

作者： Viera Trnovcová pavel P. Fedorov Ivan Furár1 Department of Physics Faculty of Materials Science and Technology Slovak University of Technology SK-91724 Trnava Slovakia Institute of General Physics Russian Academy of Sciences Moscow Russia

Relations between the structure, ionic conductivity and dielectric properties of fluoride systems of different structures containing rare earth elements were presented. Superionic conductivities, by fluoride ions, of fluorite-structured （MF2-REF3, M=Ba, Pb, RE=La-Lu, Sc, Y）, orthorhombic （REF3, RE=Tb-Er, Y）, tysonite-structured （REF3-MF2, RE=La-Nd, M=Sr）, monoclinic （BaRE2Fs, RE=Ho-Yb, Y） fluoride single crystals and eutectic composites （LiF-REF3, RE=La-Gd, Y） were compared. Anisotropy of electrical properties of crystals with a lower symmetry was explained by modeling optimum ionic paths. For explanation of concentration dependences of fast ionic conductivity, models of aggregation of defects into clusters were proposed. In fluorite-structured crystals, the highest ionic conductivity was found for PbF2：7 mol% ScF3 （at 500 K, σ500=0.13 S/cm）. In tysonite-structured crystals, the highest ionic conductivity was found for LaF3：3 mol% SrF2 （σ500=2.4×10^-2 S/cm）. Different types of coordination polyhedrons and their different linking in orthorhombic and tysonite structure explained large differences between conductivities in both structures. Eutectic systems, prepared as directionally solidified composites, enabled to study some orthorhombic fluoride phases （GdF3, SmF3）, which cannot be prepared as single crystals. An influence of the orthorhombic-tysonite phase transition on the ionic conductivity was shown.

关键词： rare earth containing fluorides superionic conductivity defects conduction mechanisms clustering single crystals composites

Toxicological effects of nanoselenium in animals

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Journal of Animal Science and Biotechnology 2022年第6期13卷 1610-1622页

作者： Iqra Bano Sylvie Skalickova Safia Arbab Lenka Urbankova pavel Horky Department of Physiology and Biochemistry Faculty of BioscienceShaheed Benazir Bhutto University of Veterinary&Animal SciencesSakrand 67210Pakistan Department of Animal Nutrition and Forage Production Mendel University in BrnoZemedelska 1CZ-61300 BrnoCzech Republic Key Laboratory of Veterinary Pharmaceutical Development Ministry of AgricultureLanzhou Institute of Husbandry and Pharmaceutical SciencesChinese Academy of Agricultural SciencesLanzhou 730050China.

The productivity and sustainability of livestock production systems are heavily influenced by animal *** maintain homeostatic balance in the body of the animal at different phases of life,the percentage of organically active minerals in livestock feed must be ***(Se)is a crucial trace mineral that is required for the maintenance of many functions of the *** nanoparticles(SeNPs)attracted considerable interest from researchers for a variety of applications a decade ago,owing to their extraordinary *** offer significant advantages over larger-sized materials,by having a comparatively wider surface area,increased surface energy,and high *** its benefits,SeNP also has toxic effects,therefore safety concerns must be taken for a successful *** toxicological effects of SeNPs in animals are characterized by weight loss,and increased mortality rate.A safe-by-strategy to certify animal,human and environmental safety will contribute to an early diagnosis of all risks associated with *** review is aimed at describing the beneficial uses and potential toxicity of SeNPs in various *** will also serve as a summary of different levels of SeNPs which should be added in the feed of animals for better performance.

关键词： Nanoparticles Organism Selenium Toxicity Trace minerals

Scalable nanocomposite parylene-based memristors:Multifilamentary resistive switching and neuromorphic applications

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Nano Research 2023年第2期16卷 3207-3214页

作者： Anna N.Matsukatova Artem Yu.Vdovichenko Timofey D.Patsaev pavel A.Forsh pavel K.Kashkarov Vyacheslav A.Demin Andrey V.Emelyanov National Research Centre“Kurchatov Institute” Moscow 123182Russia Physics Department Lomonosov Moscow State UniversityMoscow 119991Russia Moscow Institute of Physics and Technology DolgoprudnyjMoscow oblast 141701Russia Enikolopov Institute of Synthetic Polymeric Materials Russian Academy of SciencesMoscow 117993Russia Physics Department Saint Petersburg State UniversitySt.Petersburg 199034Russia

Memristors are promising candidates for synapse emulation in brain-inspired neuromorphic computing *** main obstacle to their usage in such systems is high variability of memristive characteristics and its severe negative effect on the neural network *** paper addresses the issue from two points of view on the example of the parylene-based memristors:(i)the methods of the memristor internal stochasticity decrease and(ii)the methods of the memristive neural network architecture *** introduction of an optimal Ag nanoparticle concentration(3 vol.%–6 vol.%)to the memristive structure leads to a statistically significant decrease in the switching voltage variation and endurance ***,it is shown that post-fabrication annealing improves memristive characteristics,e.g.,resistive switching window increases by an order of magnitude and exceeds 106,the switching voltage variation decreases by a factor of 2(down to 7%for the set and 17%for the reset voltage),and thermostability is *** transmission electron microscopy and impedance spectroscopy analysis allowed establishing a multifilamentary resistive switching mechanism for nanocomposite parylene-based *** simulation of the formal neural network based on these memristors demonstrates high classification accuracy with low variation for an important biomedical task,heart disease prediction,after careful feature selection and network architecture *** prospects of the controlled incorporation of the nanocomposite parylene-based memristors in neural networks are brightened by their scaling possibility in crossbar geometry.

关键词： memristor resistive switching neuromorphic computing parylene nanocomposite