Autor: Pietraszek, B. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Production of heterogeneous surfaces by ESD and LBM
Autorzy:: Radek, N.
Pliszka, I.
Antoszewski, B.
Świderski, B.
Pietraszek, J.
Powiązania:: https://bibliotekanauki.pl/articles/111850.pdf
Data publikacji:: 2016
Wydawca:: Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:: heterogeneous surfaces
electro-spark deposition
ESD
laser beam machining
LBM
texturing
properties
powierzchnia heterogeniczna
obróbka wiązką laserową
teksturowanie
Opis:: The paper is concerned with testing Cu-Mo coatings deposited over carbon steel C45 which were then eroded with a laser beam. The properties were assessed by analyzing the effects of laser eroded, texturing methodology and wear tests. The tests were conducted for Mo and Cu coatings (the anode) which were electro-spark deposited over the C45 steel substrate (the cathode) and melted with a laser beam. The coatings were deposited by means of an ELFA-541. The laser processing was performed with an Nd:YAG laser. The coatings after laser processing are still distinguished by very good performance properties which make them suitable for use in sliding friction pairs.
Źródło:: Production Engineering Archives; 2016, 13, 4; 44-48
2353-5156
2353-7779
Pojawia się w:: Production Engineering Archives
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Prolonged exposure to transdermal nicotine improves memory in male mice, but impairs biochemical parameters in male and female mice
Autorzy:: Nieradko-Iwanicka, B.
Pietraszek, D.
Pośnik, K.
Borzecki, A.
Powiązania:: https://bibliotekanauki.pl/articles/2082061.pdf
Data publikacji:: 2018
Wydawca:: Instytut Medycyny Wsi
Tematy:: memory
biochemical parameters
nicotine
Opis:: Introduction. Nicotine is an alkaloid that affects the functioning of the central nervous system and produces dependence. In low doses, it acts as a stimulant and relaxant. Nicotine was reported to have pro-cognitive effects in humans and animals. However, high doses of nicotine are harmful for many organs.The aim of the study was to check whether a 30-day exposure to transdermal nicotine affects memory and biochemical parameters in mice. Materials and method. A total of 32 mice (16 males and 16 females) were used in the experiment. Mice were divided into 4 groups of 8 animals each: I control-females receiving placebo patches for 30 days, II females receiving nicotine patches for 30 days, III control-males receiving placebo patches, IV males receiving nicotine patches. Spontaneous alternation and locomotor activity were examined weekly in a Y-maze. Body mass was recorded daily. On day 30, venous blood samples were obtained and the animals were anaesthetized with CO2. Their blood was used to measure alanine transaminase (ALT), asparagine transaminase (AST), cholesterol, creatinine and glycosylated haemoglobin (HbA1C). Results. Nicotine significantly improved memory in male mice on day 8. It increased ALT and AST activities in males and females, as well as the concentration of cholesterol in their blood sera. Conclusions. In conclusion, transdermal nicotine may produce transient improvement in fresh spatial memory in male mice, but it is not a long-term effect and therefore nicotine does not seem to be appropriate for use in the treatment of neurodegenerative disorders. It elevates blood cholesterol level and thus may increase the risk of atherosclerosis and cardiovascular events; moreover, it negatively affects liver enzymes. Nicotine use is therefore not recommended.
Źródło:: Annals of Agricultural and Environmental Medicine; 2019, 26, 1; 62-66
1232-1966
Pojawia się w:: Annals of Agricultural and Environmental Medicine
Dostawca treści:: Biblioteka Nauki

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