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Tytuł:
Mathematical model for tissue stresses in growing plant cells and organs
Autorzy:
Lewicka, S
Pietruszka, M.
Tematy:
growing plant
plant cell
mathematical model
tissue stress
equilibrium equation
plant organ
Pokaż więcej
Wydawca:
Polskie Towarzystwo Botaniczne
Powiązania:
https://bibliotekanauki.pl/articles/57317.pdf  Link otwiera się w nowym oknie
Opis:
In this study we propose a simple mathematical model based on the equilibrium equation for the materials deformed elastically. Owing to the turgor pressure of the cells, the peripheral walls of the outer tissue are under tension, while the extensible inner tissue is under compression. This well known properties of growing multicellular plant organs can be derived from the equation for equilibrium. The analytic solutions may serve as a good starting point for modeling the growth of a single plant cell or an organ.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tibial stress injuries : location, severity, and classification in magnetic resonance imaging examination
Autorzy:
Pacho, Ryszard
Pacho, Szymon
Gmachowska, Agata Maria
Majek, Aleksandra
Feldman, Beata
Żabicka, Magdalena
Opis:
Purpose: To describe and illustrate the spectrum of magnetic resonance imaging (MRI) findings of tibial stress injuries (TSI) and propose a simplified classification system. Material and methods: Retrospective analysis of MRI exams of 44 patients with clinical suspicion of unilateral or bilateral TSI, using a modified classification system to evaluate the intensity and location of soft-tissue changes and bone changes. Results: Most of the patients were young athletic men diagnosed in late stage of TSI. Changes were predominantly found in the middle and distal parts of tibias along medial and posterior borders. Conclusions: TSI may be suspected in young, healthy patients with exertional lower leg pain. MRI is the only diagnostic method to visualise early oedematic signs of TSI. Knowledge of typical locations of TSI can be helpful in proper diagnosis before its evolution to stress fracture.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Stress coping mechanisms in patients with chronic dermatoses
Autorzy:
Klejna, Andrzej
Dudek, Dominika
Gierowski, Józef
Wojas-Pelc, Anna
Grabski, Bartosz
Korabel, Hanna
Jaworek, Andrzej
Opis:
Objective. The results of numerous studies of today confirm that persons suffering from psychosomatic disorders are not able to effectively cope with stress. The experience of stress is also frequently combined with the occurrence or aggravation of various skin diseases. The goal of our study was to identify the predominant ways of coping with stress in the group of patients with chronic dermatoses. Methods. The group under study included patients receiving treatment in the Dermatology Clinic of Collegium Medicum, Jagiellonian University. They were either hospitalized patients or those who came for control examinations at the Outpatient Clinic. Evaluation of the forms of coping with stress was conducted with the help of the Endler and Parker Questionnaire - CISS. Results. They significantly more often apply the style of coping focused on avoiding (p-value= 0.0056). It also turned out that the patients in the dermatological groups manifested a constant tendency to get involved in vicarious activities (p-value=0.0247). Discussion. The results of the presented study indicate that there is a statistically significant difference between the patients with dermatological disorders and those in the control group as regards their ways of coping with stress. Conclusion. The results obtained in the discussed study may be a starting point for designing a complex support for the patients with skin diseases. The therapeutic technique that may prove helpful for this group of patients is the cognitive-behavioral therapy (CTB).
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
A study of oxidative stress and pulmonary damage after silica instillation in rats and the effect of curcumin administration
Autorzy:
Barsan, Maria
Rajnoveanu, Armand G.
Cocarla, Aristotel
Bolfa, Pompei
Login, Cezar C.
Socaciu, Andreea I.
Decea, Nicoleta
Leucuta, Daniel-Corneliu
Tematy:
curcumin
silicosis
experimental study
silica
oxidative stress
lung tissue
Pokaż więcej
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Powiązania:
https://bibliotekanauki.pl/articles/2081923.pdf  Link otwiera się w nowym oknie
Opis:
BackgroundThe authors’ aim was to study the dynamics of oxidative stress in experimental exposure to silica dust, to evaluate the histopathological findings in the phase preceding the formation of fibrous/fibrohyaline pulmonary nodules, and to assess the effects of curcumin administration.Material and MethodsThe research was performed on 48 male Wistar rats with an average weight of 320 g. Overall, 38 rats were instilled with a single dose of 0.3 ml suspension containing 30 mg of a SiO2/ml saline solution, and were sacrificed 30, 90 and 120 days after instillation; 14 of those sacrificed on days 90 and 120 also received curcumin. The control group included 10 animals which were instilled with a saline solution. Malondialdehyde (MDA), carbonyl proteins (CPs), total thiolic proteins (TPs) and reduced glutathione (GSH) were determined in blood and the lung tissue. The standard technique for pulmonary toxicology developed by Porter was applied to semi-quantitatively assess the histopathological findings.ResultsIt was found that MDA had increased significantly early on in both biological environments and remained elevated, and adding curcumin proved beneficial, while CPs only increased moderately in the lung tissue without a curcumin impact. Moreover, TPs dropped abruptly, significantly and persistently in the lung tissue and blood, and were not influenced by curcumin. Finally, GSH decreased significantly and intensely in the lung tissue and blood, with curcumin lowering the levels towards those found within the control group. The histopathological examination identified nodules of a cellular type, without any fibrosis, but with spots of associated lipoproteinosis. The early lesions in the airways and vessels were suggestive of a remodeling process. Curcumin diminished the occurrence of alveolitis but not the remodeling process.ConclusionsThe study confirms the early onset of oxidative stress in experimental silicosis. It also simultaneously and dynamically researches markers of oxidative stress in blood and the lung tissue. Curcumin proved beneficial on oxidative stress and lesions in the alveolar epithelia, but ineffective in preventing vascular and airway remodeling. Med Pr. 2021;72(3):239–47
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of anti- and prooxidants on rhizogenesis from hypocotyls of Mesembryanthemum crystallinum L. cultured in vitro
Autorzy:
Konieczny, Robert
Michalec-Warzecha, Ż.
Kozieradzka-Kiszkurno, M.
Miszalski, Z.
Libik-Konieczny, M.
Bizan, Jakub
Opis:
The enrichment with antioxidants (glutathione or ascorbate) or prooxidants (alloxan, methylviologen, hydrogen peroxide) of root inducing medium significantly decreased rhizogenesis frequency (alloxan, hydrogen peroxide) or inhibited roots regeneration (ascorbate, methylviologen) during the in vitro culture of Mesembryanthemum crystallinum L. hypocotyls. The adventitious roots morphology, root hairs length and density, was also influenced. Changes in the rhizogenesis course were related to the differences in hydrogen peroxide concentration during following days of culture between explants exhibiting morphogenic potential and those without the ability to form adventitious roots. In explants with morphogenic potential, rhizogenesis induction was always accompanied by a high level of hydrogen peroxide followed by the decrease in H_{2}O_{2} content in following days. In contrast, in the explants without regeneration potential, the level of hydrogen peroxide was increasing during the culture period. Activity patterns of superoxide dismutase (SOD) and guaiacol peroxidase (POX) in the following days of culture were similar in the explants exhibiting regeneration potential cultured on different media. Total activity of SOD decreased during initial days of culture and then increased due to the activation of additional SOD isoform described as MnSODII. The activity of POX was low during the rhizogenesis induction, and then increased during following days of culture; the increase was correlated with the decrease in hydrogen peroxide content. In the explants without the ability to regenerate roots, the total activity of SOD was low throughout the whole culture period, whereas the POX activity was significantly higher than in hypocotyls with regeneration potential. It might be concluded that the increase in hydrogen peroxide during initial stages of rhizogenesis and the induction of MnSODII are prerequisites for adventitious roots formation from hypocotyls of M. crystallinum, independently in the presence of anti- or prooxidant in the culture medium.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
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