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1

Cadmium influence on membrane permeability in Acer pseudoplatanus L. callus cultures

100%
Filek M., Niewiadomska E., Pilipowicz M., Miszalski Z.
Biological Bulletin of Poznań. Supplement
|
1996
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tom 33
2

A study of membrane permeability changes during nerve action potential by means of computer simulation

100%
Gorzelanczyk E. J., Wrzeciono B., Markiewicz-Wrzeciono M.
Current Topics in Biophysics
|
1992
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tom 16
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nr 1
3

Flower development and senescence in Ranunculus asiaticus L.

72%
Shahri W., Tahir I.
Journal of Fruit and Ornamental Plant Research
|
2011
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tom 19
|
nr 2
Flower development of Ranunculus asiaticus L. growing in the University Bo­tanic Garden was divided into six stages (I - VI): tight bud stage (I), loose bud stage (II), half open stage (III), open flower stage (IV), partially senescent stage (V) and senescent stage (VI). The average life span of an individual flower after it is fully open is about 5 days. Membrane permeability of sepal tissues estimated as electrical conductivity of ion leachates (^S), increased as the development proceeded through various stages. The content of sugars in the petal tissues increased during the flower opening period and then declined during senescence. The soluble proteins registered a consistent decrease with the simultaneous increase in specific protease activity and a-amino acid content during different stages of flower development and senescence. The content of total phenols registered an initial increase as the flowers opened, and then declined during senescence.
4

Changes in erythrocyte membrane permeability induced by verapamil, chlorpromazine, and their combinations with amphotericin B

72%
Knopik-Skrocka A., Bielawski J., Chowanski S., Walkowiak P.
Biological Letters
|
2011
|
tom 48
|
nr 2
5
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Content available

Ameliorative effect of CaCl2 on growth, membrane permeability and nutrient uptake in Oryza sativa grown at high NaCl salinity

72%
Anbu D., Sivasankaramoorthy S.
International Letters of Natural Sciences
|
2014
|
tom 03
A pot culture was carried out with Oryza sativa L. vari-Co-39, to investigate the effects of supplementary calcium chloride on plants grown at NaCl (50mM) concentration. Treatments were: (1) Control: nutrient solution alone (C); (2) nutrient solution plus 50mM sodium chloride (NaCl); (3) nutrient solution plus 10mM calcium chloride (CaCl2); (4) nutrient solution plus 15mM calcium chloride (CaCl2); (5) nutrient solution and 50 mM NaCl plus supplementary 10 mM CaCl2 (NaCl + CaCl2); and (6) 50 mM NaCl plus additional mixture of 15 mM CaCl2 in nutrient solution (NaCl + CaCl2). The plants grown under salt stress produced low dry weight and relative water content than those grown in standard nutrient solution and in CaCl2 alone. Supplemental calcium chloride added to nutrient solution containing salt significantly improved growth and relative water content. Membrane permeability increased with high NaCl application and these increases in root membrane permeability were decreased with supplementary Ca. The concentration of chloride (Cl) increases highly for all treatments. Sodium (Na) concentration in plant tissues increased in both shoots and roots at high NaCl treatment. Application of supplementary Ca lowered Na concentration. Concentrations of Ca. K and N were at deficient ranges in the plants grown at high NaCl levels and these deficiencies were corrected by supplementary Ca. The ameliorating effect of Ca on growth and physiological variables could reduce the negative effect of salinity of Oryza sativa L., plants.
6

The influence of selenium on the accumulation of K and Ca ions in rape seedlings subjected to cadmium stress

72%
Ploskonka J., Rudolphi-Skorska E., Sieprawska A.
Zeszyty Problemowe Postępów Nauk Rolniczych
|
2010
|
tom 545
The aim of the experiment was to study the effects of selenium ions on the changes in membrane permeability for K and Ca in the leaves of rape during cadmium stress. The of stress level was determined by changes in the mass increment and lipid peroxidation (MDA concentration) in 3-week-old seedlings cultured in vitro on Murashige and Skoog [1962] medium (control) and on medium containing 600 µМ CdCl2. Selenium was added at the concentration of 2 µМ (Na2SeO4) to the control and medium containing cadmium ions. The level of K and Ca was determined with ionoselective electrodes after one hour of shaking leaf discs (membrane permeability) and heating to 100°C (total ion content). Cadmium present in the nutrient medium inhibited the mass increment and increased MDA concentration, and significantly decreased membrane permeability for K and Ca. In the mixtures of cadmium and selenium, selenium ions partially reduced the effects of the stress-inducing cadmium action on the studied physiological parameters and membrane permeability to the studied ions. The observed protective effect of selenium can be the result of the effect of this substance on both the activity of ion channels and peroxidation of membrane lipids.
7
Content available remote

Effect of cyclic adenosine monophosphate on the G protein-dependent inward rectifier Kplus-like channel current in medial prefrontal cortex pyramidal neurons

72%
Witkowski G., Rola R., Szulczyk P.
Journal of Physiology and Pharmacology
|
2012
|
tom 63
|
nr 5
8

The influence of Bipolaris sorokiniana and Drechslera dictyoides metabolites on cell membrane permeability of Festuca pratensis callus

72%
Plazek A., Filek M.
Acta Physiologiae Plantarum
|
1998
|
tom 20
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nr 3
The aim of this study was the evaluation of membrane permeability of callus cells of several Polish meadow fescue cultivars, which were treated with toxins of two leaf spot pathogens Bipolaris sorokiniana and Drechslera dictyoides. Fungus metabolites were obtained by the method described by Lepoivre et al. (1986). Calli of cultivars ‘Skrzeszowicka’, ‘Skawa’, ‘Westa’, POB 282, POB 383, KOA 186 have been selected on medium with metabolites for two weeks. Next the conductivity test of electrolyte leakage and of total ion contents in the examined tissue was done. On the base of this data the membrane permeability coefficients for each cultivar were calculated. Toxins of B. sorokiniana damaged the cell membranes more strongly than metabolites of D. dictyoides. The significant differences of several objects sensitivity to the influence of B. sorokiniana metabolites were stated. These differences were not observed in the case of the influence of D. dictyoides metabolites on the examined tissue.
9

Effect of carotenoides on oxygen transport within and across model membranes

72%
Subczynski W. K., Markowska E.
Current Topics in Biophysics
|
1992
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tom 16
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nr 2
10

Effects of hydrogen fluoride fumigation on plasma membrane composition and ATPase activity in Pinus strobus L. seedlings-it possible consequences in changes of membrane permeability and water relations

72%
Rakowski K. J., Zwiazek J. J.
Biophysics of Membrane Transport
|
1994
|
tom 12
|
nr 2
11
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Ocena przepuszczalności błon komórkowych siewek jęczmienia w warunkach niedoboru wody

58%
Acta Agrophysica
|
2017
|
tom 24
|
nr 3
Badania dotyczące wpływu niedoboru wody na przepuszczalność błon komórkowych liści i korzeni siewek jęczmienia jarego odmian Ella i Kucyk przeprowadzono w kontrolowanych warunkach. Oceny przepuszczalności błon komórkowych dokonano zmodyfikowaną metodą konduktometryczną. Obliczono względny wyciek elektrolitów (EL) na podstawie wartości przewodnictwa elektrycznego. Za pomocą metody spektrofotometrycznej wyznaczono względny współczynnik wycieku (RLR). Stwierdzono, że wartości zarówno EL, jak i RLR wzrastają wraz ze wzrostem niedoboru wody. Może to świadczyć o zmianach w błonach komórkowych i utracie przez nie właściwości półprzepuszczalnych pod wpływem niedoboru wody. Zaobserwowano wyższe wartości współczynnika RLR w porównaniu do wartości wskaźnika EL podczas oceny uszkodzeń błon komórkowych liści i korzeni siewek obu odmian jęczmienia.
12

Effects of amphiphiles on cell membranes and membrane-connected events

58%
Isomaa B., Hagerstrand H., Makela J. H.
Biophysics of Membrane Transport
|
1992
|
tom 11
|
nr 1
13

Exogenous spermidine alters in different way membrane permeability and lipid peroxidation in water stressed barley leaves

58%
Kubis J.
Acta Physiologiae Plantarum
|
2006
|
tom 28
|
nr 1
In order to see whether polyamines will modify membrane functioning in the water stressed plants, barley (Hordeum vulgare) seedlings were treated with spermidine (Spd) prior to dehydration and then the stress-evoked changes in membrane permeability (i.e. in electrolyte leak age from leaves) and lipid peroxidation (indicated by modifications of the malondi -aldehyde (MDA) level, and of the lipoxygenase (LOX) activity) were fol lowed. The Spd treatement lowered in jury index in plants subjected to water deficit, al though it slightly in creased the stress-promoted LOX activity and in creased the MDA level in the studied leaves. Presented results confirm that spermidine stabi lizes plant membranes under water stress conditions. However, this effect does not seem to be asso ciated with the Spd-induced modifications in the lipid peroxidation activities.
14

Decrease in beech [Fagus sylvatica] seed viability caused by temperature and humidity conditions as related to membrane damage and lipid composition

58%
Ratajczak E., Pukacka S.
Acta Physiologiae Plantarum
|
2005
|
tom 27
|
nr 1
The aim of this study was to determine if the loss of germinability and viability of beech (Fagus sylvatica L.) seeds stored at different variants of temperature (4, 20, and 30 °C) and relative humidity (RH: 45 and 75 %) is associated with a loss of membrane integrity and changes in lipid composition. Beech seeds stored for 9 weeks gradually lost viability at a rate dependent on temperature and humidity. The harmful effect of temperature increased with growing humidity. The loss of seed viability was strongly correlated with an increase in membrane permeability and with production of lipid hydroxyperoxides (LHPO), which was regarded as an indicator of peroxidation of unsaturated fatty acids. The condition of membranes was assessed on the basis of their permeability and the state of lipid components: phospholipids and fatty acids. During seed storage we obterved a decline in concentration of individual phospholipids and fatty acids, proportional to the loss of seeds viability. We also detected a decrease in concentrations of α-tocopherol and sterols, which play an important role in protection of membranes against the harmful influence of the environment. Our results show that the germinability of beech seeds declines rapidly at temperature above 0 °C and growing humidity. This is due mainly to the loss ofmembrane integrity, caused by peroxidation of unsaturated fatty acids.
15
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Content available

Effects of heat shock and teprenone on ethanol-induced damage to cultured rabbit gastric mucosal cells

58%
Takahashi S., Yamazaki T., Okabe S.
Journal of Physiology and Pharmacology
|
1996
|
tom 47
|
nr 3
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