Jan Długosz University

About: Jan Długosz University is a education organization based out in Częstochowa, Poland. It is known for research contribution in the topics: Crystal structure & Luminescence. The organization has 749 authors who have published 2311 publications receiving 19395 citations. The organization is also known as: Higher Teacher Education School.

Postural stability in the cognitively impaired elderly: a systematic review of the literature

Abstract: IntroductionThe aim of this study was to review the literature and critically analyse publications connecting cognitive impairment with postural stability.MethodsFour electronic databases were searched. The inclusion criteria comprised the relation between the process of maintaining balance and cognitive impairment.ResultsOf the 153 selected articles, 15 met the inclusion criteria. In 83% of publications, cognitive status was determined with the use of the Mini-Mental State Examination. In eight publications, postural stability was examined using force plates. Other methods used to test the balance were functional tests, i.e. the Berg Balance Scale or the Balance Evaluation Systems Test.ConclusionAs the choice of methodology varies significantly, it is difficult to attempt an objective comparison between different studies. There is a clear need for the normalisation of methods used to assess the degree of dementia and to assess postural stability among this group of people.

Ytterbium-porphyrins as a new class of the luminescent labels

Abstract: New complexes of ytterbium with asymmetric porphyrins containing substituents in β-positions and hydrophobic meso-(monophenyl-p-oxypropyl)triphenylporphyrin (OPP) were obtained and characterized by elemental analysis, IR, UV-Vis absorption and luminescence spectroscopy. Electronic absorption, luminescence and luminescence excitation spectra of these complexes were studied at 295 K in DMF solutions and in the water-lecithin medium. The 4f-luminescence of ytterbium-porphyrins in the near infrared (IR) spectral region (λmax = 980 nm) is observed under excitation in Soret band (400-430 nm). The effect of substituent in porphyrin macroring on the 4f-luminescent properties was also investigated. The conjugates of these compounds with protein molecules - bovine serum albumin (BSA) were investigated as well. These compounds are interesting at the initial stage of diagnostics of tumor tissues as IR-luminescent probes due to their spectral-luminescent characteristics and some biochemical properties.

Locally defined operators in Hölder's spaces

Abstract: We prove that every local operator acting between two Holder spaces H ϕ and H ψ is a Nemytskij operator and if H ϕ ⊈ H ψ then it is a constant map. Moreover, we show that if K is local and uniformly continuous then it is an affine mapping.

Effect of cationic impurities on solubility and crystal growth processes of ammonium oxalate monohydrate: Role of formation of metal‐oxalate complexes

Abstract: The effect of different bi- and trivalent cationic impurities on the solubility of ammonium oxalate and the composition and distribution of chemical complexes formed in saturated ammonium oxalate aqueous solutions as a function of impurity concentration are investigated. The knowledge of the composition and stability of complexes formed in saturated aqueous solutions is then employed to explain the appearance of dead zones of supersaturation for growth and the difference in the effective segregation coefficient of the impurities. Analysis of the experimental results revealed that: (1) at a constant temperature, the dependence of concentration of complex species formed in saturated solutions on the concentration of different impurities can be described by an equation similar to that of the concentration dependence of density of solutions, (2) the dominant metal-containing species present in saturated solutions are negatively-charged, most stable oxalato complexes like Cu(C2O4)22−, Mn(C2O4)34−, Zn(C2O4)34−, Cr(C2O4)33− and Fe(C2O4)33−, (3) in the investigated range of impurity concentration, the solubility of ammonium oxalates increases linearly with the concentration of all impurities and the increase is associated with the stability of dominant complexes, (4) appearance of dead supersaturation zones in the presence of impurities is associated with instantaneous adsorption of all growth sites by dominant oxalato complexes in relatively short adsorption time, and (5) the segregation coefficient of an impurity cation M of charge z + increases with a decrease in the solubility product constant Ksp for the hydrolysis products of reactions of the type: Mz + M1(z −1)+ + H+ (where the cation M has z + charge, and H+ is hydrogen ion). (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)