scholarly journals Influence of some new aminophosphonates on electrical properties and stability of plasma membranes of plant cells

2014 ◽  
Vol 71 (3) ◽  
pp. 223-226
Author(s):  
Janusz Sarapuk ◽  
Krzysztof Bielecki ◽  
Zenon Trela
Keyword(s):  
Plasma Membranes ◽  
Structural Changes ◽  
Electrical Conductance ◽  
Direct Interaction ◽  
Resting Potential ◽  
Lipid Phase ◽  
Nitellopsis Obtusa ◽  
Organophosphorous Compounds ◽  
Membrane Resting Potential ◽  
The One

The effect of new aminophosphonates, synthesized for potential agricultural application, on membrane potential and electrical conductance of internodal cells of <em>Nitellopsis obtusa</em> and their efficiency in modifying the properties of cucumber (<em>Cucumis sativus</em> cv "Wisconsin") cotyledon membranes was studied. They differed in substituents at the carbon and phosphorus atoms. It was found that the organophosphorous compounds caused depolarization of the membrane resting potential and increased electrical conductance of alga membranes. They also influenced chlorophyll content and efflux of electrolytes from cucumber cotyledons. The most significant effects were observed for the compound with iso-propyl substituents at the P atom. In contrast, the weakest modifier of the studied compounds was the one having phenolic substituents at that atom. The observed changes are most probably the result of direct interaction of aminophosphonates with the lipid phase of the plasma membrane and the induced structural changes in it.

Physiological and Hemolytic Toxicity of Some Aminophosphonates

2001 ◽  
Vol 56 (9-10) ◽  
pp. 838-842 ◽  
Author(s):  
Zenon Trela ◽  
Halina Kleszczyńska ◽  
Janusz Sarapuk
Keyword(s):  
Structural Changes ◽  
Electrical Conductance ◽  
Direct Interaction ◽  
Structural Features ◽  
Erythrocyte Membranes ◽  
Lipid Phase ◽  
Nitellopsis Obtusa ◽  
Organophosphorous Compounds ◽  
Modes Of Interaction ◽  
Hemolytic Toxicity

AbstractThe effect of novel synthesized aminophosphonates on membrane potential and electrical conductance of internodal cells of Nitellopsis obtusa and hemolysis of erythrocytes (RBC) was studied. It was found that those the organophosphorous compounds, when present at 10-100 μm concentrations, caused depolarization and increased electrical conductance of alga membranes. They also influenced fluidity of erythrocyte membranes. When used at higher concentrations aminophosphonates caused hemolysis of RBC. The changes observed depended on structural features of the aminophosphonates, i.e., substituents at the carbon, phosphorus and nitrogen atoms, and, most probably, may be the result of direct interaction of the am inophosphonates with the lipid phase of the plasma membrane and the induced structural changes. Two modes of interaction are proposed.

scholarly journals Ion-Induced Volume Transition in Gels and Its Role in Biology

Gels ◽  
2021 ◽  
Vol 7 (1) ◽  
pp. 20
Author(s):  
Matan Mussel ◽  
Peter J. Basser ◽  
Ferenc Horkay
Keyword(s):  
Nonlinear Response ◽  
Structural Changes ◽  
Ionic Composition ◽  
Biological Systems ◽  
Experimental Results ◽  
Resting Potential ◽  
Cell Secretion ◽  
Solvent Quality ◽  
Volume Transition ◽  
Biological Milieu

Incremental changes in ionic composition, solvent quality, and temperature can lead to reversible and abrupt structural changes in many synthetic and biopolymer systems. In the biological milieu, this nonlinear response is believed to play an important functional role in various biological systems, including DNA condensation, cell secretion, water flow in xylem of plants, cell resting potential, and formation of membraneless organelles. While these systems are markedly different from one another, a physicochemical framework that treats them as polyelectrolytes, provides a means to interpret experimental results and make in silico predictions. This article summarizes experimental results made on ion-induced volume phase transition in a polyelectrolyte model gel (sodium polyacrylate) and observations on the above-mentioned biological systems indicating the existence of a steep response.

scholarly journals Entangling Lattice-Trapped Bosons with a Free Impurity: Impact on Stationary and Dynamical Properties

Entropy ◽  
2021 ◽  
Vol 23 (3) ◽  
pp. 290
Author(s):  
Maxim Pyzh ◽  
Kevin Keiler ◽  
Simeon I. Mistakidis ◽  
Peter Schmelcher
Keyword(s):  
Structural Changes ◽  
Many Body ◽  
Wide Range ◽  
Entropy Measures ◽  
Particle Level ◽  
The Many ◽  
The One ◽  
Tunneling Dynamics ◽  
The Individual ◽  
Trapped Bosons

We address the interplay of few lattice trapped bosons interacting with an impurity atom in a box potential. For the ground state, a classification is performed based on the fidelity allowing to quantify the susceptibility of the composite system to structural changes due to the intercomponent coupling. We analyze the overall response at the many-body level and contrast it to the single-particle level. By inspecting different entropy measures we capture the degree of entanglement and intraspecies correlations for a wide range of intra- and intercomponent interactions and lattice depths. We also spatially resolve the imprint of the entanglement on the one- and two-body density distributions showcasing that it accelerates the phase separation process or acts against spatial localization for repulsive and attractive intercomponent interactions, respectively. The many-body effects on the tunneling dynamics of the individual components, resulting from their counterflow, are also discussed. The tunneling period of the impurity is very sensitive to the value of the impurity-medium coupling due to its effective dressing by the few-body medium. Our work provides implications for engineering localized structures in correlated impurity settings using species selective optical potentials.

scholarly journals Structural and Technological Approach to Reveal the Role of the Lipid Phase in the Formation of Soy Emulsion Gels with Chia Oil

Gels ◽  
2021 ◽  
Vol 7 (2) ◽  
pp. 48
Author(s):  
Ana M. Herrero ◽  
Claudia Ruiz-Capillas
Keyword(s):  
Raman Spectroscopy ◽  
Structural Properties ◽  
Structural Changes ◽  
Protein Secondary Structure ◽  
Lipid Phase ◽  
Α Helix ◽  
Β Sheet ◽  
Shed Light ◽  
Chia Oil

Considerable attention has been paid to emulsion gels (EGs) in recent years due to their interesting applications in food. The aim of this work is to shed light on the role played by chia oil in the technological and structural properties of EGs made from soy protein isolates (SPI) and alginate. Two systems were studied: oil-free SPI gels (SPI/G) and the corresponding SPI EGs (SPI/EG) that contain chia oil. The proximate composition, technological properties (syneresis, pH, color and texture) and structural properties using Raman spectroscopy were determined for SPI/G and SPI/EG. No noticeable (p > 0.05) syneresis was observed in either sample. The pH values were similar (p > 0.05) for SPI/G and SPI/EG, but their texture and color differed significantly depending on the presence of chia oil. SPI/EG featured significantly lower redness and more lightness and yellowness and exhibited greater puncture and gel strengths than SPI/G. Raman spectroscopy revealed significant changes in the protein secondary structure, i.e., higher (p < 0.05) α-helix and lower (p < 0.05) β-sheet, turn and unordered structures, after the incorporation of chia oil to form the corresponding SPI/EG. Apparently, there is a correlation between these structural changes and the textural modifications observed.

scholarly journals Oxidative damage to DNA: Inhibition of guanine damage

2006 ◽  
Vol 78 (12) ◽  
pp. 2297-2304 ◽  
Author(s):  
Sriram Kanvah ◽  
Gary B. Schuster
Keyword(s):  
Oxidative Damage ◽  
Structural Changes ◽  
Global Structure ◽  
Chemical Damage ◽  
Oxidation Of Dna ◽  
Anthraquinone Derivatives ◽  
Covalently Linked ◽  
The One ◽  
Oxidative Damage To Dna ◽  
Dna Inhibition

One-electron oxidation of DNA results in chemical damage to nucleobases, particularly guanine in multiple G sequences. Oxidation may be triggered by numerous events, including photosensitization. We describe studies of photoinduced oxidations of DNA triggered by irradiation of covalently linked anthraquinone derivatives under various conditions that affect the global structure of the DNA. These structural changes have subtle effects on the result of the one-electron oxidation.

scholarly journals Structural changes and economic growth in the world economy and Russia

2019 ◽  
Vol 5 (1) ◽  
pp. 1-26 ◽  
Author(s):  
Valeriy V. Mironov ◽  
Liudmila D. Konovalova
Keyword(s):  
Economic Growth ◽  
Growth Rate ◽  
Global Economy ◽  
World Economy ◽  
Structural Changes ◽  
Russian Economy ◽  
The World ◽  
Preliminary Version ◽  
The One ◽  
Relationship Of

The article considers the problem of the relationship of structural changes and economic growth in the global economy and Russia in the framework of different methodological approaches. At the same time, the paper provides the analysis of complementarity of economic policy types, which, on the one hand, are aimed at developing the fundamentals of GDP growth (institutions, human capital and macroeconomic stabilization), and on the other hand, at initiating growth (with stable fundamentals) with the help of structural policy measures. In the study of structural changes in the global economy, new forms of policies of this kind have been revealed, in particular aimed at identifying sectors — drivers of economic growth based on a portfolio approach. In a given paper a preliminary version of the model of the Russian economy is provided, using a multisector version of the Thirlwall’s Law. Besides, the authors highlight a number of target parameters of indicators of competitiveness of the sectors of the Russian economy that allow us to expect its growth rate to accelerate above the exogenously given growth rate of the world economy.

scholarly journals Monitoring the degradation of partly decomposable plastic foils

2014 ◽  
Vol 6 (1) ◽  
pp. 39-44
Author(s):  
Gabriella Rétháti ◽  
Krisztina Pogácsás ◽  
Tamás Heffner ◽  
Barbara Simon ◽  
Imre Czinkota ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Molecular Mass ◽  
Structural Changes ◽  
Thermoplastic Starch ◽  
Medium Density ◽  
Insulating Layer ◽  
Elongation At Break ◽  
One Year ◽  
The One

Abstract We have monitored the behaviour of different polyethylene foils including virgin medium density polyethylene (MDPE), MDPE containing pro-oxydative additives (238, 242) and MDPE with pro-oxydative additives and thermoplastic starch (297) in the soil for a period of one year. A foil based on a blend of polyester and polylactic acid (BASF Ecovio) served as degradable control. The experiment was carried out by weekly measurements of conductivity and capacity of the soil, since the setup was analogous to a condenser, of which the insulating layer was the foil itself. The twelve replications allowed monthly sampling; the specimen taken out from the soil each month were tested visually for thickness, mechanical properties, morphological and structural changes, and molecular mass. Based on the obtained capacity values, we found that among the polyethylene foils, the one that contained thermoplastic starch extenuated the most. This foil had the greatest decrease in tensile strength and elongation at break due to the presence of thermoplastic starch. The starch can completely degrade in the soil; thus, the foil had cracks and pores. The polyethylene foils that contained pro-oxydant additives showed smaller external change compared to the virgin foil, since there was no available UV radiation and oxygen for their degradation. The smallest change occurred in the virgin polyethylene foil. Among the five examined samples, the commercially available BASF foil showed the largest extenuation and external change, and it deteriorated the most in the soil.

scholarly journals Optimization of Trade Structure Between Russia and China Under the Initiative «One Belt and One Way»

2019 ◽  
Vol 3 (3) ◽  
pp. 17-24
Author(s):  
Bo Lyu
Keyword(s):  
Development Strategy ◽  
Structural Changes ◽  
Political Climate ◽  
National Interests ◽  
Trade Relations ◽  
Bilateral Relations ◽  
Strategic Trade ◽  
The World ◽  
Chinese Trade ◽  
The One

Russia is a very important partner in the Chinese development strategy «One Belt and One Way». Deepening of Russian-Chinese trade and economic cooperation meets the national interests and aspirations of Russia and China, playing a catalytic role in the development of bilateral relations and stabilizing the political and economic situation on the Eurasian continent and in the world. The development of Russian-Chinese trade relations have undergone many cooperative processes, and trade itself overtime has revealed its own pecularities, related to the time and political climate. Russia and China are the two largest economic powers in the world, and they have significant prospects and potential for cooperation. After China put forward the «One Belt and One Way» strategic development plan, the prospect of cooperation between the two countries has attracted an increasing attention. The article analyzes the history and current state of bileteral strategic trade relations. Some research opinions are put forward considering structural changes in the development process.

scholarly journals Mixed Ca/Sr salt forms of salicylic acid: tuning structure and aqueous solubility

2018 ◽  
Vol 74 (2) ◽  
pp. 131-138 ◽  
Author(s):  
Pamela Allan ◽  
Jean-Baptiste Arlin ◽  
Alan R. Kennedy ◽  
Aiden Walls
Keyword(s):  
Salicylic Acid ◽  
Coordination Polymer ◽  
Single Crystal ◽  
Structural Feature ◽  
Structural Changes ◽  
Aqueous Solubility ◽  
Single Crystal Diffraction ◽  
One Dimensional ◽  
The One ◽  
Salt Forms

Ten isostructural single-crystal diffraction studies of mixed cation Ca/Sr salt forms of the salicylate anion are presented, namely catena-poly[[diaquacalcium(II)/strontium(II)]-bis(μ2-2-hydroxybenzoato)], [Ca1–x Sr x (C7H5O3)2(H2O)2] n , where x = 0, 0.041, 0.083, 0.165, 0.306, 0.529, 0.632, 0.789, 0.835 and 1. The structure of an isostructural Sr/Ba species, namely catena-poly[[diaquastrontium(II)/barium(II)]-bis(μ2-2-hydroxybenzoato)], [Sr0.729Ba0.271(C7H5O3)2(H2O)2], is also described. The Ca/Sr structures form a series where, with increasing Sr content, the unit cell expands in both the crystallographic a and c directions (by 1.80 and 3.18%, respectively), but contracts slightly in the b direction (−0.31%). The largest percentage structural expansion lies parallel to the direction of propagation of the one-dimensional coordination polymer that is the primary structural feature. This structural expansion is thus associated with increased M—O distances. Aqueous solubility measurements show that solubility generally increases with increasing Sr content. Thus, tuning the composition of these mixed counter-ion salt forms leads to systematic structural changes and allows solubility to be tuned to values between those for the pure Ca and Sr species.

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