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1.
Dovgan Barbara Miklavčič Damijan Knežević Miomir Zupan Janja Barlič Ariana 《Cytotechnology》2021,73(3):391-411
Cytotechnology - Trehalose is a nontoxic disaccharide and a promising cryoprotection agent for medically applicable cells. In this study, the efficiency of combining trehalose with reversible... 相似文献
2.
Andreja Radović Vassiliki Kati Melita Perčec Tadić Damijan Denac Dražen Kotrošan 《Bird Study》2013,60(1):106-114
Capsule Spatial environmental modelling well predicted nesting distribution of the White stork in Southeast Europe and can be used in conservation planning with respect to climate change.Aims To create spatial models for predicting White Stork presence and densities in the Southeast Europe to identify areas of suitable habitat for White Storks.Methods We quantified the habitat used by nesting White storks in Southeast Europe. Using spatial modelling, we defined a set of free and available online environmental variables that predict the breeding localities of the species. We employed pseudo-absences and the kriging of the residuals in order to create predictive models of nest presence and density.Results The presence–absence model was found to be precise in predicting the presence of nests. Both density and presence of breeding pairs were best explained negatively by elevation, slope, minimum temperature during May, and distance to the nearest human settlement and positively by topographic wetness index, total area of human settlement and spring precipitation.Conclusion Our robust and easily repeatable models offer a conservation tool to reveal suitable but unoccupied localities for breeding White Storks pairs which may inform our understanding of how climate change might affect the species' distribution in the future. For example, protecting White Storks on the Dalmatian coast may become even more significant in the future, because the Dalmatian coast is predicted as the only suitable breeding area in Croatia later this century. 相似文献
3.
Electroporation-based treatments rely on increasing the permeability of the cell membrane by high voltage electric pulses applied to tissue via electrodes. To ensure that the whole tumor is covered with sufficiently high electric field, accurate numerical models are built based on individual patient anatomy. Extraction of patient''s anatomy through segmentation of medical images inevitably produces some errors. In order to ensure the robustness of treatment planning, it is necessary to evaluate the potential effect of such errors on the electric field distribution. In this work we focus on determining the effect of errors in automatic segmentation of hepatic vessels on the electric field distribution in electroporation-based treatments in the liver. First, a numerical analysis was performed on a simple ''sphere and cylinder'' model for tumors and vessels of different sizes and relative positions. Second, an analysis of two models extracted from medical images of real patients in which we introduced variations of an error of the automatic vessel segmentation method was performed. The results obtained from a simple model indicate that ignoring the vessels when calculating the electric field distribution can cause insufficient coverage of the tumor with electric fields. Results of this study indicate that this effect happens for small (10 mm) and medium-sized (30 mm) tumors, especially in the absence of a central electrode inserted in the tumor. The results obtained from the real-case models also show higher negative impact of automatic vessel segmentation errors on the electric field distribution when the central electrode is absent. However, the average error of the automatic vessel segmentation did not have an impact on the electric field distribution if the central electrode was present. This suggests the algorithm is robust enough to be used in creating a model for treatment parameter optimization, but with a central electrode. 相似文献
4.
In many electroporation applications mass transport in biological tissue is of primary concern. This paper presents a theoretical advancement in the field and gives some examples of model use in electroporation applications. The study focuses on post-treatment solute diffusion. 相似文献
5.
Matej Reberšek Cécile Faurie Maša Kandušer Selma Čorović Justin Teissié Marie-Pierre Rols Damijan Miklavčič 《Biomedical engineering online》2007,6(1):25
Background
Gene electrotransfer is a non-viral method used to transfer genes into living cells by means of high-voltage electric pulses. An exposure of a cell to an adequate amplitude and duration of electric pulses leads to a temporary increase of cell membrane permeability. This phenomenon, termed electroporation or electropermeabilization, allows various otherwise non-permeant molecules, including DNA, to cross the membrane and enter the cell. The aim of our research was to develop and test a new system and protocol that would improve gene electrotransfer by automatic change of electric field direction between electrical pulses. 相似文献6.
Igor Marjanovič Saša Haberl Damijan Miklavčič Maša Kandušer Mojca Pavlin 《The Journal of membrane biology》2010,236(1):97-105
Knowledge of the parameters which influence the efficiency of gene electrotransfer has importance for practical implementation
of electrotransfection for gene therapy as well as for better understanding of the underlying mechanism. The focus of this
study was to analyze the differences in gene electrotransfer and membrane electropermeabilization between plated cells and
cells in a suspension in two different cell lines (CHO and B16F1). Furthermore, we determined the viability and critical induced
transmembrane voltage (ITVc) for both cell lines. In plated cells we obtained relatively little difference in electropermeabilization and gene electrotransfection
between CHO and B16F1 cells. However, significant differences between the two cell lines were observed in a suspension. CHO
cells exhibited a much higher gene electrotransfection rate compared to B16F1 cells, whereas B16F1 cells reached maximum electropermeabilization
at lower electric fields than CHO cells. Both in a suspension and on plated cells, CHO cells had a slightly better survival
rate at higher electric fields than B16F1 cells. Calculation of ITVc in a suspension showed that, for both electropermeabilization and gene electrotransfection, CHO cells have lower ITVc than B16F1 cells. In all cases, ITVc for electropermeabilization was lower than ITVc for gene electrotransfer, which is in agreement with other studies. Our results show that there is a marked difference in
the efficiency of gene electrotransfer between suspended and plated cells. 相似文献
7.
The preference for foraging in groups and the effect of physiognomic factors of a habitat on its use by foraging Whinchats
(Saxicola rubetra) was studied during spring migration stopover in a mosaic cultural landscape at the SE Adriatic coast. Every record of spatially
distinct Whinchats, either a solitary individual or a group, was referred to as a Whinchat unit. The units were classified
as intensively foraging, less intensively foraging or non-foraging and divided into four size classes. The effect of physiognomic
habitat factors on use of habitat by foraging Whinchat units was modelled. All possible additive models using logit link function
were constructed from five independent physiognomic variables: (1) natural perches (NP), (2) artificial perches (AP), (3)
high herbal vegetation (HHV), (4) open bushes (OB) and (5) heterogeneity of vegetation types (HVT). Variables HHV and OB were
included simultaneously in the models. Models that were substantially supported by the data were selected according to second
order Akaike’s information criterion AICc. Two such models contained variable(s) (1) NP and (2) NP + AP. The relative importance weights of physiognomic variables
NP, AP, HVT, HHV and OB were 1, 0.38, 0.24, 0.13 and 0.13, respectively. Perches were thus the most important physiognomic
habitat factor affecting habitat use by Whinchats in a mosaic cultural landscape. The great majority of Whinchats foraged
in groups and the proportion of intensively foraging Whinchat units increased with unit size, leading to the conclusion that
Whinchats preferred social to solitary foraging on the spring stopover at the SE Adriatic coast. 相似文献
8.
In this paper, we report the results of a systematic attempt to relate the intrinsic plasma membrane fluidity of three different
cell lines to their electroporation behaviour, which consists of reversible and irreversible electroporation. Apart from electroporation
behaviour of given cell lines the time course required for membrane resealing was determined in order to distinguish the effect
of resealing time from the cell’s ability to survive given electric pulse parameters. Reversible, irreversible electroporation
and membrane resealing were then related to cell membrane fluidity as determined by electron paramagnetic resonance spectroscopy
and computer characterization of membrane domains. We found that cell membrane fluidity does not have significant effect on
reversible electroporation although there is a tendency for the voltage required for reversible electroporation to increase
with increased membrane fluidity. Cell membrane fluidity, however, may affect irreversible electroporation. Nevertheless,
this effect, if present, is masked with different time courses of membrane resealing found for the different cell lines studied.
The time course of cell membrane resealing itself could be related to the cell’s ability to survive. 相似文献
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10.
Placement of a cell into an external electric field causes a local charge redistribution inside and outside of the cell in the vicinity of the cell membrane, resulting in a voltage across the membrane. This voltage, termed the induced membrane voltage (also induced transmembrane voltage, or induced transmembrane potential difference) and denoted by ΔΦ, exists only as long as the external field is present. If the resting voltage is present on the membrane, the induced voltage superimposes (adds) onto it. By using one of the potentiometric fluorescent dyes, such as di-8-ANEPPS, it is possible to observe the variations of ΔΦ on the cell membrane and to measure its value noninvasively. di-8-ANEPPS becomes strongly fluorescent when bound to the lipid bilayer of the cell membrane, with the change of the fluorescence intensity proportional to the change of ΔΦ. This video shows the protocol for measuring ΔΦ using di-8-ANEPPS and also demonstrates the influence of cell shape on the amplitude and spatial distribution of ΔΦ. 相似文献