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1

Quasi-quantum effects in biological systems

100%
Molski M.
Current Topics in Biophysics. Supplement
|
2011
|
tom 34
|
nr A: Plenary lectures
2

From mitogenetic to necrotic radiations – toward the photon cycling in biological systems and electromagnetic existence

100%
Slawinski J.
Current Topics in Biophysics. Supplement
|
2011
|
tom 34
|
nr A: Plenary lectures
3

Influence of starburst PAMAM dendrimers on human red blood cell potential

100%
Domanski D. M., Faber M. A., Bryszewska M., Leyko W.
Cellular and Molecular Biology Letters
|
1999
|
tom 04
|
nr 2
4

Modeling the meta-dynamics of lymphocyte repertoires

100%
Mehr R.
Archivum Immunologiae et Therapiae Experimentalis
|
2001
|
tom 49
|
nr 2
5

Electrophysiological study of the mechanism of modulation of gabaergic synaptic currents by hydrogen ions

100%
Mandat M., Zarnowska E. D., Mercik K., Mozrzymas J. W.
Cellular and Molecular Biology Letters
|
2002
|
tom 07
|
nr 3
6

Modelling of energetical balance of honey bee wintering generation

100%
Stalidzans E., Krauze A., Berzonis A.
Pszczelnicze Zeszyty Naukowe
|
2000
|
tom 44
|
nr 2
7

Deterministic and noise-induced signal amplification and signal transfer in coupled nonlinear systems

100%
Kaiser F.
Cellular and Molecular Biology Letters
|
1999
|
tom 04
|
nr 1
Nonlinear oscillatory processes are discussed under the influence of external signals to improve the understanding of signal interaction with and within biological systems. The biological endogeneous rhythms are modelled by self-sustained oscillations (limit cycles). Main emphasis is on the combined influence of very slow and very fast stimuli compared to the relevant internal frequencies and on additional effects caused by external and internal noise sources. The models represent arrays of coupled passive and active nonlinear oscillators, an external harmonic signal stimulates the input oscillator (initial stage of signal chain). Signal transfer through the pathway is studied under the influence of noise. Different noise contributions are considered, including spatially-coherent and spatially-incoherent sources. Results reveal a stochastic resonance kind of behaviour at different stages of the signal transfer, the harmonic signal is transduced through the whole system of coupled oscillators. The combined action of different noise exhibits constructive as well as destructive influences on signal amplification. In addition, the influence of noise on the synchronous behaviour of coupled active systems is investigated. Noise-induced synchronization as well as desynchronization of the output signal to the external drive result. Besides signal amplification the systems exhibit the property to decode the frequency encoded information.
8
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Selected aspects of endothelial dysfunction and their influence on the atherosclerosis process modeled and analyzed by Petri net based approach

84%
Formanowicz D., Kozak A., Formanowicz P.
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
|
2011
|
tom 92
|
nr 4
9

Dexamethasone effects on Bax expression in the mouse testicular germ cells

84%
Mahmoud H., Mahmoud O., Layasadat K., Naeim A.
Folia Histochemica et Cytobiologica
|
2009
|
tom 47
|
nr 2
237-241
10

Green fluorescent protein as a molecular marker in microbiology

84%
Rosochacki S. J., Matejczyk M.
Acta Microbiologica Polonica
|
2002
|
tom 51
|
nr 3
11

Planar, cylindrical and spherical electrical double layers in biological systems. The effect of counterion size

84%
Bohinc K., Iglic A., Slivnik T., Kralj-Iglic V.
Cellular and Molecular Biology Letters
|
2002
|
tom 07
|
nr 3
The effect of counterion size on the electrical properties of an electrolyte solution in contact with charged planar, cylindrical and spherical surfaces is considered. Electrostatic interaction is considered by means of the mean electrostatic field, while the finite size of particles constituting the electrolyte solution is considered via the excluded volume effect within the lattice statistics. Different sizes of counterion are described by different values of the lattice constant. It is shown that the excluded volume effect considerably decreases the calculated number density of counterions near the charged surface. This effect is more pronounced in cylindrical geometry than in spherical geometry, and less pronounced than in planar geometry.
12

Photoreceptor guanylate cyclase variants: cGMP production under control

84%
Sokal I., Alekseev A., Palczewski K.
Acta Biochimica Polonica
|
2003
|
tom 50
|
nr 4
Changes in the Ca2+ concentration are thought to affect many processes, including signal transduction in a vast number of biological systems. However, only in few cases the molecular mechanisms by which Ca2+ mediates its action are as well understood as in phototransduction. In dark-adapted photoreceptor cells, the equilibrium level of cGMP is maintained by two opposing activities, such as phosphodiesterase (PDE) and guanylate cyclase (GC). Upon absorption of photons, rhodopsin-G-protein- mediated activation of PDE leads to a transient decrease in [cGMP] and subsequently to lowering of [Ca2+]. In turn, lower [Ca2+] increases net production of cGMP by stimulation of GC until dark conditions are re-established. This activation of GC is mediated by Ca2+-free forms of Ca2+-binding proteins termed GC-activating proteins (GCAPs). The last decade brought the molecular identification of GCs and GCAPs in the visual system. Recent efforts have been directed toward understanding the properties of GC at the physiological and structural levels. Here, we summarize the recent progress and present a list of topics of ongoing research.
13
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Content available

Phytoplankton assemblage of a solar saltern in Port Fouad, Egypt

67%
Madkour F. F., Gaballah M. M.
Oceanologia
|
2012
|
tom 54
|
nr 4
14

Swimming velocity of Paramecium under the conditions of weightlessness

67%
Hemmersbach-Krause R., Briegleb W., Vogel K., Hader D. P.
Acta Protozoologica
|
1993
|
tom 32
|
nr 4
15

Activity of selected aromatic amino acids in biological systems

59%
Krzysciak W.
Acta Biochimica Polonica
|
2011
|
tom 58
|
nr 4
 Besides the structural function in proteins, aromatic amino acids are precursors of many important biological compounds essential for normal functioning of the human organism. Many of these compounds may be used as markers for identification of specific pathological states. Comprehensive knowledge about the metabolism of aromatic amino acids and mechanisms of action of their metabolites made it possible to develop effective treatments for many disorders. However, it should not be forgotten that in some pathological conditions, these compounds could not only be involved in the pathogenesis of many disease entities but could also be used as an important tool in prediction of many diseases. This paper contains a review of published literature on aromatic amino acids in the context of physiological processes of the human body and chosen social disorders, such as cancers; psychiatric disorders: depression, anxiety states, schizophrenia, bipolar affective disorders; neurodegenerative, and cardiovascular diseases; chronic kidney insufficiency or diabetes.
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