Search results

1

Alteration in pattern of rapid eye movements activity during REM sleep in depression

100%

Wichniak A., Antczak J., Wierzbicka A., Jernajczyk W.

Acta Neurobiologiae Experimentalis

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2002

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vol. 62

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issue 4

243-250

EN

The aim of the study was to evaluate REM sleep parameters, especially the temporal characteristics of rapid eye movement activity, in depressed patients, and to compare three different methods for scoring of REM density. The sleep of 15 nonmedicated depressed patients and 13 healthy controls was recorded during two consecutive nights. Sleep recordings were scored by raters blinded to the diagnosis. In comparison to healthy controls depressed patients showed an increased REM density and increased REM activity. Both groups differed also regarding the pattern of REM density changes between REM sleep periods (REMPs). Whereas in healthy controls REM density in the first REMP was significantly lower than in the successive REMPs, no such difference was found in depressed patients. On visual inspection we failed to find any significant differences in the time course of REM activity within the first REMP in depressed patients. All applied methods for scoring of REM density distinguished depressed patients from healthy controls with comparable accuracy.

2

Rocking Curve Imaging Studies of Laterally Overgrown GaAs and GaSb Epitaxial Layers

100%

Wierzbicka A., Lübbert D., Domagała J., Zytkiewicz Z.

Acta Physica Polonica A

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2009

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vol. 116

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issue 5

976-978

EN

X-ray rocking curve imaging technique was used to study crystallographic perfection of laterally overgrown epitaxial structures. We focus on rocking curve imaging studies of Si-doped GaAs and GaSb laterally overgrown layers grown by liquid phase epitaxy on SiO_{2} masked GaAs and GaSb/GaAs substrates, respectively. High spatial resolution offered by rocking curve imaging technique allows studying the effect of laterally overgrown epitaxial wing tilt towards the mask. Distribution of tilt magnitude over the area of laterally overgrown epitaxial stripes is easily determined. In heteroepitaxial GaSb/GaAs laterally overgrown epitaxial structures local mosaicity in the wing area was detected. Since individual grains are clearly visible on rocking curve imaging maps, their size and relative misorientation can be determined.

3

Influence of Substrate on Crystallographic Quality of AlGaN/GaN HEMT Structures Grown by Plasma-Assisted MBE

88%

Wierzbicka A., Żytkiewicz Z., Sobańska M., Kłosek K., Łusakowska E.

Acta Physica Polonica A

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2012

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vol. 121

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issue 4

899-902

EN

Results of characterization of AlGaN/GaN high electron mobility transistor (HEMT) structures grown by plasma-assisted molecular beam epitaxy (PAMBE) are reported. High resolution X-ray diffraction (HRXRD) and X-ray reflectivity (XRR) were applied to show that structural properties of the AlGaN/GaN layers strongly depend on the substrate used for growth. It has been found that an additional 10 μm thick HVPE GaN layer grown on a commercial GaN/sapphire substrate significantly improves structural quality of AlGaN layer. However, the best structural parameters have been obtained for the HEMT sample grown on free-standing HVPE bulk GaN substrate.

4

Carbon Nanomaterials Application as a Counter Electrode for Dye-Sensitized Solar Cells

76%

Dobrzański L. A., M P. v. P., Drygała A., Wierzbicka A., Lukaszkowicz K., Szindler M.

Archives of Metallurgy and Materials

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2017

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vol. 62

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issue 1

5

Clinical course of homozygous familial hypercholesterolemia during childhood: report on 4 unrelated patients with homozygous or compound heterozygous mutationsin the LDLR gene

64%

Kubalska J., Chmara M., Limon J., Wierzbicka A., Prokurat S., Szaplyko J., Kowalik A., Mierzewska H., efesche J. C., Pronicka E.

Journal of Applied Genetics

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2008

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vol. 49

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issue 1

109-113

EN

Natural history of the disease in 4 unrelated Polish children with homozygous familial hypercholesterolemia (FH) is described. Their phenotypic homozygosity was established by identification of known LDLR gene mutations on both alleles, respectively: p.G592E & p.G592E in Patient 1; p.G592E & p.C667Y in Patient 2; p.S177L & p.R350X in Patient 3; and p.G592E & deletion in the promoter region, exons 1 and 2 in Patient 4. Heterozygosity of the mutations was revealed in all patients' mothers and fathers (obligatory heterozygotes) and in 1 out of 4 siblings studied. FH was diagnosed at the age of 4 months to 9 years by cholesterol screening among family members of patients with early cardiovascular disease episodes. At the time of FH detection, the children were asymptomatic. Only in 2, some skin eruptions were found. Antihyperlipidemic therapy was started, including a lipid-lowering diet, cholestyramine, and HMG-CoA inhibitors if necessary. No cardiovascular symptoms appeared during the observation up to the age of 18, 20, 19, and 17 years, respectively. An increase in external carotid artery diameter was found in a patient at the age of 9 years, and LDL-apheresis was introduced in his therapy. We conclude that the analysis of LDLR gene mutations in the studied FH children made it possible to identify 4 presymptomatic FH homozygotes and to introduce early appropriate treatment. Multicenter analysis of such persons would finally determine if the early lipid-lowering procedures can significantly reduce the risk of premature cardiovascular disease in homozygous FH.

6

Epitaxial ZnO Films Grown at Low Temperature for Novel Electronic Application

52%

Wachnicki Ł., Dużyńska A., Domagala J., Witkowski B., Krajewski T., Przeździecka E., Guziewicz M., Wierzbicka A., Kopalko K., Figge S., Hommel D., Godlewski M., Guziewicz E.

Acta Physica Polonica A

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2011

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vol. 120

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issue 6A

A-7-A-10

EN

Monocrystalline films of zinc oxide were grown at 300C by atomic layer deposition. ZnO layers were grown on various substrates like ZnO bulk crystal, GaN, SiC and Al_2O_3. Electrical properties of the films depend on structural quality. Structural quality, surface morphology and optical properties of ZnO films were characterized using X-ray diffraction, scanning electron microscopy, and photoluminescence, respectively. High resolution X-ray diffraction spectra show that the rocking curve FWHM of the symmetrical 00.2 reflection equals to 0.058° and 0.009° for ZnO deposited on a gallium nitride template and a zinc oxide substrate, respectively. In low temperature photoluminescence sharp excitonic lines in the band-edge region with a FWHM equal to 4 meV, 5 meV and 6 meV, for zinc oxide deposited on gallium nitride, zinc oxide and sapphire substrate, respectively.

Refine search results

Alteration in pattern of rapid eye movements activity during REM sleep in depression

Rocking Curve Imaging Studies of Laterally Overgrown GaAs and GaSb Epitaxial Layers

Influence of Substrate on Crystallographic Quality of AlGaN/GaN HEMT Structures Grown by Plasma-Assisted MBE

Carbon Nanomaterials Application as a Counter Electrode for Dye-Sensitized Solar Cells

Clinical course of homozygous familial hypercholesterolemia during childhood: report on 4 unrelated patients with homozygous or compound heterozygous mutationsin the LDLR gene

Epitaxial ZnO Films Grown at Low Temperature for Novel Electronic Application