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Wyszukujesz frazę "pig model" wg kryterium: Temat


Wyświetlanie 1-4 z 4
Tytuł:
Model development of hydroxyproline induced hyperoxaluria in young growing pigs
Autorzy:
Goncharova, Kateryna
Filip, Rafał
Świeboda, Paulina
Prykhodko, Olena
Fedkiv, Olexandr
Szwiec, Katarzyna
Piedra, Jose Luis Valverde
Majda, Blanka
Pierzynowski, Stefan Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/454832.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
pig model
hyperoxaluria
kidney stones
hydroxyproline
Opis:
Aim of the study. In this study, we sought to create a model of reversible hyperoxaluria in pigs by feeding with hydroxyproline (HP). Materials and methods. The experiment included 12 pigs divided into 2 groups (n = 6). The pigs were fed twice a day. At the beginning of the experiment, in the adaptation period, all pigs were given standard feed. In the next 7 days, an increasing amount of hydroxyproline (1–3% HP), was added to the feed. In next 14 days, 4% HP was administered in each pig meal. After 14 days of 4% HP diet, the pigs were randomly divided into 2 groups. For 6 pigs, 4% HP treatment had been continued for the next 14 days while the second group of pigs for the next 14 days received a standard HP free diet. 24h urine samples, blood and fecal samples were collected on particular days. Results. The addition of HP to the diet increased urinary oxalate excretion. A characteristic increase was noted after 12 days of treatment with 4% HP. During the removal period, oxalate excretion decreased in the group without HP in diet, while in the group which continued with a 4% HP diet, oxalate excretion significantly increased. Gross examination of kidneys showed that in the group which had 4% HP diet for 4 weeks, kidneys were fibrotic with enlarged cavities, and had small visible urinary stones. In second group, kidneys were relatively normal looking with no visible stones. Conclusion. Hyperoxaluria is reversible, if HP is removed 14 days after the start of 4% HP diet. Prolonged exposure up to 4 weeks causes pathologic changes in kidneys including crystals, sand and small stone formation.
Źródło:
European Journal of Clinical and Experimental Medicine; 2017, 1; 6-11
2544-2406
2544-1361
Pojawia się w:
European Journal of Clinical and Experimental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of oxalate decarboxylase on the urinary oxalate excretion in swine model of nephrocalcinosis induced by hydroxyproline
Autorzy:
Pierzynowska, Katerina
Pierzynowski, Stefan G.
Lozinska, Liudamyla
Jarmakiewicz, Sara
Świeboda, Paulina
Fedkiv, Olexandr
Szwiec, Katarzyna
Piedra, Jose Louis Valverde
Filip, Rafal
Powiązania:
https://bibliotekanauki.pl/articles/454959.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
Nephrocalcinosis
Oxalate decarboxylase
Hydroxyproline
Pig model
Opis:
Introduction. Kidney stone formation may be a result of increased urinary oxalate supersaturation. Material and Methods. Eighteen pigs were randomly divided into: Control group, where standard cereal-based feed was supplemented with 4% HP only, Prevention group, where treatment with OxDc slurry started at the end of the adaptation period when pigs were switched to 4% HP diet, Reduction group, where the treatment with OxDc lyo powder started after pigs were already on a 4% HP diet for 6 days. Results. OxDc slurry prevented oxalate excretion in urine. The reduction effect of OxDc lyo feed addition was generally visible during the first two days of the therapy (p<0.05). Both dietary intake of 4% HP and OxDc preparations did not influence weight gain, water or feed intake, urine excretion and creatinine clearance. Conclusions. The capacity of OxDc in preventing induced hyperoxaluria was moderate. Most probably, this is due to the incoherent response of animals to the HP enriched diet dependent on their gut pH, since optimum pH for OxDc is around 5-6. A higher pH essentially reduces the activity of OxDc. The capacity of OxDc in reversing the hyperoxaluria induced by a HP enriched diet was significant during the first 2 days after introducing OxDc to the diet.
Źródło:
European Journal of Clinical and Experimental Medicine; 2017, 3; 206-2016
2544-2406
2544-1361
Pojawia się w:
European Journal of Clinical and Experimental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novel potential of pancreatic-like enzymes of microbial origin in exocrine pancreatic insufficiency - study on a pig model
Autorzy:
Szwiec, K.
Goncharova, K.
Velverde-Piedra, J.L.
Ushakova, G.
Kovalenko, T.
Osadchenko, I.
Kardas, M.
Swieboda, P.
Podgurniak, P.
Winiarczyk, M.
Grochowska-Niedworok, E.
Lozinska, L.
Filip, R.
Pierzynowski, S.G.
Powiązania:
https://bibliotekanauki.pl/articles/3181.pdf
Data publikacji:
2015
Wydawca:
Instytut Medycyny Wsi
Tematy:
pancreatic-like enzyme
microbial enzyme
exocrine pancreatic insufficiency
porcine model
pig
animal model
enzyme activity
Opis:
Introduction. The standard porcine-derived pancreatic enzyme replacement therapy (PERT) is a lifesaving treatment for patients with diseases causing exocrine pancreatic insufficiency (EPI). An attempt to replace PERT with microbial enzymes were undertaken. The aim was to highlight whether the mode of application, mixed with food or applied directly to the stomach, of pancreatic-like enzymes of microbial origin (PLEM) can affect their activity along the gastrointestinal tract. Materials and method. The activity of amylase, lipase and proteinase in the stomach, duodenum and ileum were tested in EPI pigs (n=6) after supplementation of PLEM, either orally – before and during feed consumption – or via the stomach – before and during feed consumption. Healthy pigs not treated with PLEM (n=3) served as controls. Activity of the enzymes measured in the chyme were obtained together with the digesta pH. Activity of the enzymatic residues in the stool samples was also checked. Results. The highest pancreatic enzyme activities were found in the duodenum of the healthy pigs (amylase 162,68 kU/ mL, lipase 507,34 kU/mL and protolitic (trypsin) activity 357,60 kU/mL). Nevertheless, the microbial enzymes remained also active along the entire length of the GIT – including stomach in EPI pigs, regardless of their route of administration. However, activity level was significantly lower. Discussion. Results indicate that the activity pattern of PLEM in the small intestine mimics the activity of the natural endogenous pancreatic enzymes in healthy pigs. The most physiological features of PLEM were observed when enzymes were offered orally. The magnitude of PLEM activity in the stomach of EPI pigs was essential and significantly higher than that measured in healthy pigs, thus being somewhat not physiological, and for health reasons of the patients should be further explored. Interestingly, specific trypsin-like activity was measured in all parts of the GIT after PLEM application. However, proteolytic activity of the experimental proteaze in in vitro studies did not exhibit trypsin-like activity.
Źródło:
Journal of Pre-Clinical and Clinical Research; 2015, 09, 1
1898-2395
Pojawia się w:
Journal of Pre-Clinical and Clinical Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental testing and constitutive modeling of the mechanical properties of the swine skin tissue
Autorzy:
Łagan, S. D.
Liber-Kneć, A.
Powiązania:
https://bibliotekanauki.pl/articles/306666.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
materiał hipersprężysty
tkanka miękka
próba rozciągania
model konstytutywny
hyperelastic material
soft tissue
tensile test
pig’s skin
constitutive model
Opis:
The aim of the study was an estimation of the possibility of using hyperelastic material models to fit experimental data obtained in the tensile test for the swine skin tissue. Methods: The uniaxial tensile tests of samples taken from the abdomen and back of a pig was carried out. The mechanical properties of the skin such as the mean Young’s modulus, the mean maximum stress and the mean maximum elongation were calculated. The experimental data have been used to identify the parameters in specific strain-energy functions given in seven constitutive models of hyperelastic materials: neo-Hookean, Mooney–Rivlin, Ogden, Yeoh, Martins, Humphrey and Veronda–Westmann. An analysis of errors in fitting of theoretical and experimental data was done. Results: Comparison of load –displacement curves for the back and abdomen regions of skin taken showed a different scope of both the mean maximum loading forces and the mean maximum elongation. Samples which have been prepared from the abdominal area had lower values of the mean maximum load compared to samples from the spine area. The reverse trend was observed during the analysis of the values of elongation. An analysis of the accuracy of model fitting to the experimental data showed that, the least accurate were the model of neo- -Hookean, model of Mooney–Rivlin for the abdominal region and model of Veronda–Westmann for the spine region. Conclusions: An analysis of seven hyperelastic material models showed good correlations between the experimental and the theoretical data for five models.
Źródło:
Acta of Bioengineering and Biomechanics; 2017, 19, 2; 93-102
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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