Wyniki wyszukiwania - Biblioteka Nauki

1

Ocena stanu technicznego chłodni kominowych w aspekcie prowadzonego reżimu chemicznego – doświadczenia z prowadzonych badań

100%

Malucha P. , Matyja A.

Energetyka

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2018

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tom nr 5

279--284

PL

Od 2004 roku Zakłady Pomiarowo-Badawcze Energetyki „ENERGOPOMIAR” Sp. z o.o. uczestniczą w procesie przeglądów technicznych i technologicznych chłodni kominowych eksploatowanych na terenie Elektrowni Rybnik wykonując wymagane i uzgodnione badania wód oraz osadów. W artykule omówiono wyniki badań, których głównym celem była okresowa ocena stanu technicznego chłodni kominowych, ze szczególnym uwzględnieniem ilości i jakości osadów obecnych na zraszalnikach, a także kontrola parametrów fizykochemicznych obiegowej wody chłodzącej i wody dodatkowej uzupełniającej obieg chłodzący. Dane uzyskiwane z takich badań pozwalają na opracowanie założeń do optymalizacji procesu przygotowania wody dodatkowej do obiegu chłodzącego oraz sposobu eksploatacji instalacji i urządzeń wchodzących w skład tego obiegu. Stwierdzono, że zawartości poszczególnych składników osadu z pakietów chłodni kształtują się na podobnym poziomie na przestrzeni ostatnich lat, a zmiany w składzie jakościowym nie wykazują znacznych wahań. Wyniki przeprowadzanych badań jednoznacznie wskazują na poprawność prowadzonego reżimu chemicznego.

EN

Starting from 2004, Zakłady Pomiarowo-Badawcze Energetyki „ENERGOPOMIAR” Sp. z o.o. have taken part in the process of technical and technological inspections conducted on cooling towers operated on the Elektrownia Rybnik site, carrying on the required and agreed tests of water and sediments. Discussed are investigation results which main aim was the assessment of cooling towers technical condition with special attention paid to quantity and quality of sediments present on wet decks as well as the control of physical and chemical parameters of the system cooling and make-up water. Data obtained from such investigations allow to elaborate assumptions of make-up water preparation process optimization and the method to operate installations and devices that the cooling system is comprised of. Noted is that the content of individual sediment components coming from cooling tower packages maintains similar level over the past years and the changes in qualitative composition do not show significant fluctuations. Results of the conducted tests explicitly indicate the correctness of the carried on chemical regime.

2

Interstitial cells of Cajal - systematic review

80%

Pasternak A. , Szura M. , Gil K. , Matyja A.

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tom 75

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nr 3

EN

This paper reviews the distribution of interstitial cells of Cajal (ICC) in the human gastrointestinal (GI) tract, based on ultrastructural and immunohistochemical evidence. The distribution and morphology of ICC at each level of the normal GI tracts is addressed from the perspective of their functional significance. Alterations of ICC reported in as well as in GI stromal tumours are reviewed, with emphasis on the place of ICC in the pathophysiology of disease. (Folia Morphol 2016, 75, 3: 281–286)

3

Wplyw dlugosci dnia na zmiany sekrecji melatoniny i prolaktyny u owiec

80%

Molik E. , Kalisz B. , Matyja A.

Wiadomości Zootechniczne

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2009

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tom 47

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nr 2

13-17

4

Wplyw dlugosci dnia na profil wydzielania hormonu wzrostu u owiec

80%

Molik E. , Matyja A. , Kalisz B.

Przegląd Hodowlany

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2009

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tom 77

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nr 04

13-14

5

Influence of vagal nerve stimulation on food intake and body weight - results of experimental studies

70%

Sobocki J. , Krolczyk G. , Herman R. M. , Matyja A. , Thor P. J.

Journal of Physiology and Pharmacology. Supplement

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2005

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tom 56

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nr 6

27-33

EN

The paper reviews recent advances in vagal nerve stimulation for the control of food intake and body weight. The vagal nerves are the predominant pathway in the "brain-gut axis" responsible for short term regulation of food intake. Stimulation of afferent vagal traffic attenuates food intake by vagal projections to nucleus tractus solitarius, arcuate nucleus and its convergence’s to thalamic center of satiety. A few studies have been published in this field so far. All of them are consistent and show significant decrease in body mass during vagal stimulation. Due to promising results of experimental studies, clinical trials are expected in the near future.

6

Effects of vagal neuromodulation and vagotomy on control of food intake and body weight in rats

61%

Laskiewicz J. , Krolczyk G. , Zurowski D. , Sobocki J. , Matyja A. , Thor P. J.

Journal of Physiology and Pharmacology

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2003

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tom 54

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nr 4

EN

Food induced neurohumoral signals are conduced to data processing brain centers mainly as vagal afferent discharge resulting in food intake regulation. The aim of this study was to evaluate effects of vagal nerve neuromodulation in control of food intake with fed-pattern microchip (MC) pacing. Experiments were performed on 60 rats divided on 5 groups: I group 0,05Hz left vagal pacing, II - pacing of both vagal nerves with MC 0,05Hz, III- left vagal MC 0,1Hz pacing, IV - pacing of both vagal nerves with MC 0,1 Hz was performed. In group V left vagal pacing was combined with right side abdominal vagotomy. Body weight and total food intake decreased by 12% and 14% (I), 26% and 30%(II), 8% and 21%(III), 14% and 30%(IV), 38% and 41%(IV), respectively (p<0.05). Effects of both vagal nerves stimulation on final body weight and food intake was significantly more effective than only single nerve MC pacing however most effective was stimulation with 0,1Hz combined with right vagotomy. We conclude that vagal stimulation reduce food intake and body weight by increasing vagal afferent signals. Our results suggest that information in vagal afferents can be modulated resulting in changes of feeding behaviour and body weight.

7

Effects of continuous microchip [MC] vagal neuromodulation on gastrointestinal function in rats

61%

Thor P. J. , Krolczyk G. , Zurowski D. , Laskiewicz J. , Slawiaczek M. , Matyja A.

Journal of Physiology and Pharmacology. Supplement

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2001

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tom 52

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nr 2

8

The effects of baclofen on the feeding behaviour and body weight of vagally stimulated rats

61%

Krolczyk G. , Laskiewicz J. , Sobocki J. , Matyja A. , Kolasinska-Kloch W. , Thor P. J.

Journal of Physiology and Pharmacology

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2005

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tom 56

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nr 1

EN

It is hypothesised that the GABA(B) receptor agonist baclofen increases or has no effect on food intake, and electrical stimulation of vagal nerves decreases food intake. The aim of this study was to evaluate the effects of baclofen in vagally stimulated rats. Material and methods: Thirty two Wistar rats were divided into five groups: group A scheduled for microchip implantation for vagal stimulation, group B for sham operation, group C for microchip implantation and baclofen medication, group D for baclofen medication only and group E for gastric motility evaluation under influence of baclofen. The following parameters were then evaluated: food intake and body mass, gastric motility, leptin, insulin, and glucose serum levels. Results: In the comparison of groups B and A, daily food intake and body weight gain decreased by 17% (p<0.05) and by 22% (p<0.05), respectively. Baclofen alone (group D) did not significantly change either food intake nor diurnal body weight compared to the controls, but when used in conjunction with the microchip (group C) it did significantly reduce effect of vagal neuromodulation (p<0.05). Furthermore, a significant decrease in leptin and glucose levels was detected in group C: 677 to 165 pg/ml (p<0.05) and 5,93 to 4,88 mmol/l (p<0.05), respectively. The administration of baclofen stimulated significantly gastric motility and elicited irregular motor migrating complex (327±200 against control 255±52 cmH2O/s). Conclusions: These results suggest that microchip vagal neuromodulation through increased vagal afferent activity induces an alteration in the feeding behaviour and decreases nocturnal food intake and body weight. These effects were partially attenuated by baclofen. The data suggests that GABA(B) receptors play an important role in the pathomechanism of attenuation of food intake induced by vagal nerve stimulation.

9

Effects of continuous microchip (MC) vagal neuromodulation on gastrointestinal function in rats

51%

Krolczyk G. , Zurowski D. , Sobocki J. , Slowiaczek M. P. , Laskiewicz J. , Matyja A. , Zaraska K. , Zaraska W. , Thor P. J.

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2001

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tom 52

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nr 4,1

EN

Afferent fibers from gastrointestinal tract outnumber efferents ten times in vagal nerves. Modifying the afferent input makes possible to change discharge of vagal efferents affecting gastrointestinal functions in process known as neuromodulation (NM). Lately it has been used in the treatment of pain and hyperactive neurogenic bladder in urology. MC induced NM may therefore provide a concurrent to pharmacology tool, in treatment of gastrointestinal disorders. The aim of this study was to investigate the effects of long term neuromodulation procedure with use of MC on gastric motility, secretion and weight control in conscious rats. Experiments were performed on 30 Wistar male rats (250—350 g) divided in two groups: sham operated and microsurgically implanted with MC on left vagal nerve below diaphragm. Following stimulation parameters were used: frequency of 0.5—30 Hz, amplitude of 0.55 V, impulse duration of 10 ms in monophasic fashion. In both groups food intake and body weight were measured through the period of 2 weeks after recovery period. Then gastric fistula was implanted in gastric antrum and fasted gastric motility recorded with use of PowerLab system (Australia). Gastric emptying and secretion were also tested with use of phenol red and automatic titration methods. On the daily basis glucose level with standard test and leptin after MC implantation were measured. Recording of vagal activity in fasted rats showed burst of action potentials about 5 ± 2,5 in period of 5000 sec, each burst with spike frequency up to 35 Hz. Food (5 ml of Intralipid – intragastrically) almost doubled amount of bursts to 12 ± 5 in period of 5000 sec with increase in frequency at spike up to 50 Hz. MC induced vagal activity showed continuous spike activity similar to fed pattern. MC induced NM decreases daily food intake by 6% (33.6 ± 4.8 vs control 35.5 ± 4.8 g, p < 0.01). Body weight gain in rats before MC implantation decreased by 20% within 2 weeks after recovery (34.8 ± 9.08 vs control 23.56 ± 4.15 g). Fasting control glucose level also decreased of 5.5% (93.15 ± 9.3 vs control 98.5 ± 11.2 mg%, p < 0.05). Frequency of gastric contractions did not change significantly in MC versus control but amplitude of contractions increased of about 66.7% (2.0 ± 0.8 vs 1.17 ± 0.52) at the dominant frequency 0.08 Hz range and about 71.5% (1.17 ± 0.35 vs 0.68 ± 0.47, p < 0.05) at the frequency 0.12 Hz. in FFT analysis PowerLab (chart v = 4.01). BAO decreased by 29.25% without H+ concentration changes (0.2 ± 0.14 vs 0.14 ± 0.12 mmol/30min, p < 0,05) but MAO did not change in MC rats (0.37 ± 0.25 vs 0.42 ± 0.28 mmol/30min, p0.05). Gastric emptying of isotonic solution increased by 10% (90.46 ± 5.34 vs 80.39 ± 9.95) percent of marker passing to duodenum /5min,.p < 0.0001). Our results suggest that MC induced NM affect brain-gut axis via influencing metabolic and gastric function and decreases body weight. 706

10

Loss of interstitial cells of Cajal after pulsating electromagnetic field (PEMF) in gastrointestinal tract of the rats

51%

Kaszuba-Zwoinska J. , Gil K. , Ziomber A. , Zaraska W. , Pawlicki R. , Krolczyk G. , Matyja A. , Thor P. J.

Journal of Physiology and Pharmacology

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2005

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tom 56

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nr 3

EN

Exposure to the magnetic field has remarkably increased lately due to fast urbanization and widely available magnetic field in diagnosis and treatment. However, biological effects of the magnetic field are not well recognized. The myoelectric activity recorded from the gastrointestinal and urinary systems is generated by specialized electrically active cells called interstitial cells of Cajal (ICCs). Thus it seems rational that ICC have significant vulnerability to physical factors like an electromagnetic field. The aim of this study was to evaluate the influence of pulsating electromagnetic field (PEMF) (frequency 10 kHz, 30ms, 300 µT burst, with frequency 1Hz) on ICCs density in the rat gastrointestinal tract. Rats were divided into two groups (n=32). The first group was exposed to PEMF continuously for 1, 2, 3, and 4 weeks (n = 16), and the second group (n=16) served as a control. Tissue samples of the rat stomach, duodenum and proximal colon were fixed and paraffin embedded. The tangential sections of 5µm thickness were stained immunohistochemically with anti-c-Kit (sc-168) antibody and visualized finally by DAB as chromogen (brown end product). C-Kit positive branched ICC-like cells were detected under the light microscope, distinguished from the c-kit-negative non-branched smooth muscle cells and from the c-kit positive but non-branched mast cells and quantitatively analyzed by MultiScan computer program. Apoptosis detection was performed with rabbit anti-Bax polyclonal antibody (Calbiochem, Germany) and LSABTM 2 visualization system. The surface of c-Kit immunopositive cells decreased after exposure to PEMF in each part of the gastrointestinal tract. Reduced density of ICCs was related to exposure time. The most sensitive to PEMF were ICCs in the fundus of the stomach and in the duodenum, less sensitive were ICCs in the colon and pacemaker areas of the stomach. No marked changes in ICC density in the pyloric part of the stomach were observed. We demonstrate that the PEMF induced apoptosis dependent decrease in ICC expression.