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Relative humidity in droplet and airborne transmission of disease J. Biol. Phys. (IF 1.135) Pub Date : 2021-02-10 Anže Božič, Matej Kanduč
A large number of infectious diseases are transmitted by respiratory droplets. How long these droplets persist in the air, how far they can travel, and how long the pathogens they might carry survive are all decisive factors for the spread of droplet-borne diseases. The subject is extremely multifaceted and its aspects range across different disciplines, yet most of them have only seldom been considered
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Toxicity mechanism of Cu 2+ ion individually and in combination with Zn 2+ ion in characterizing the molecular changes of Staphylococcus aureus studied using FTIR coupled with chemometric analysis J. Biol. Phys. (IF 1.135) Pub Date : 2020-11-25 Annika Durve Gupta, Esakimuthu Kavitha, Shikha Singh, Sivakumaran Karthikeyan
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Physical models of infant mortality: implications for defects in biological systems J. Biol. Phys. (IF 1.135) Pub Date : 2020-11-25 Alex Bois, Eduardo M. García-Roger, Elim Hong, Stefan Hutzler, Ali Irannezhad, Abdelkrim Mannioui, Peter Richmond, Bertrand M. Roehner, Stéphane Tronche
Reliability engineering concerned with failure of technical inanimate systems usually uses the vocabulary and notions of human mortality, e.g., infant mortality vs. senescence mortality. Yet, few data are available to support such a parallel description. Here, we focus on early-stage (infant) mortality for two inanimate systems, incandescent light bulbs and soap films, and show the parallel description
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Kinetic factors may reshape the dependence of crystal nucleation rate on temperature in protein bulk solution J. Biol. Phys. (IF 1.135) Pub Date : 2020-10-16 Ivaylo L. Dimitrov
Here we provide an analysis of primary results obtained from a study of apoferritin crystal nucleation in compositionally invariant bulk solution at constant supersaturation ratio of the protein. The temperature dependence of the stationary crystal nucleation rate in the protein bulk solution is obtained with the help of experimentally determined probability for detection of at least one crystal per
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How is information transmitted in a nerve? J. Biol. Phys. (IF 1.135) Pub Date : 2020-10-10 Michel Peyrard
In the last 15 years, a debate has emerged about the validity of the famous Hodgkin-Huxley model for nerve impulse. Mechanical models have been proposed. This note reviews the experimental properties of the nerve impulse and discusses the proposed alternatives. The experimental data, which rule out some of the alternative suggestions, show that while the Hodgkin-Huxley model may not be complete, it
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The effects of coating culture dishes with collagen on fibroblast cell shape and swirling pattern formation. J. Biol. Phys. (IF 1.135) Pub Date : 2020-08-29 Kei Hashimoto,Kimiko Yamashita,Kanako Enoyoshi,Xavier Dahan,Tatsu Takeuchi,Hiroshi Kori,Mari Gotoh
Motile human-skin fibroblasts form macroscopic swirling patterns when grown to confluence on a culture dish. In this paper, we investigate the effect of coating the culture-dish surface with collagen on the resulting pattern, using human-skin fibroblast NB1RGB cells as the model system. The presence of the collagen coating is expected to enhance the adherence of the fibroblasts to the dish surface
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Exposure of Deinococcus radiodurans to both static magnetic fields and gamma radiation: observation of cell recuperation effects. J. Biol. Phys. (IF 1.135) Pub Date : 2020-08-18 Henriette Righi,João D T Arruda-Neto,José G C Gomez,Luiziana F da Silva,Elizabeth S R Somessari,Aline C C Lemos
The extremophilic bacterium Deinococcus radiodurans displays an extraordinary ability to withstand lethal radiation effects, due to its complex mechanisms for both proteome radiation protection and DNA repair. Published results obtained recently at this laboratory show that D. radiodurans submitted to ionizing radiation results in its DNA being shattered into small fragments which, when exposed to
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Magnitude and significance of the peak of early embryonic mortality. J. Biol. Phys. (IF 1.135) Pub Date : 2020-08-17 Qinghua Chen,Zengru Di,Eduardo M García Roger,Hui Li,Peter Richmond,Bertrand M Roehner
Embryonic development is of great importance because it determines congenital anomalies and influences their severity. However, little is known about the actual probabilities of success or failure and about the nature of early embryonic defects. Here, we propose that the analysis of embryonic mortality as a function of post-fertilization time provides a simple way to identify major defects. By reviewing
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Modified Asano-Ohya-Khrennikov quantum-like model for decision-making process in a two-player game with nonlinear self- and cross-interaction terms of brain's amygdala and prefrontal-cortex. J. Biol. Phys. (IF 1.135) Pub Date : 2020-07-25 Luluk Muthoharoh,Hendradi Hardhienata,Husin Alatas
In this report, we propose a modification on the Asano-Ohya-Khrennikov quantum-like decision-making process model of a two-player game by adding additional nonlinear terms to the related comparison step dynamical equation. The additions are in the form of a self-interaction and cross-interaction of the brain’s amygdala and prefrontal cortex. We show that the cross-interaction significantly determines
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Magnetic circular dichroism in Archean atmosphere and asymmetric photolysis of biomolecules: enantiomeric excess of prebiotic sugar. J. Biol. Phys. (IF 1.135) Pub Date : 2020-07-02 A Sharma
In the terrestrial dipolar magnetic field, magnetic circular dichroism (MCD) of UV sunlight by paramagnetic O2 in an Archean atmosphere (mostly CO2 and N2) results in circular polarization anisotropy (~ 10−10). This is used to calculate enantiomeric excess (EE~10−13) of glyceraldehyde (3-carbon sugar) with a model that includes racemic production and asymmetric photolysis of its enantiomers. The sign
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Macromolecule crowding effects on the phase separation of semi-flexible polymer in spherical confined space. J. Biol. Phys. (IF 1.135) Pub Date : 2020-07-01 Hongchang Wang,Lingyun Gu,Rongri Tan,Xiaotian Ma,Xun Zhou,Yanhui Liu
Current works focus on detecting macromolecule crowding effects on the phase separation of the mixture between semi-flexible polymer and crowders (hydrophilic polymers) in confined space by Monte Carlo simulations. With the increasing addition of crowders into the spherical confined space, the semi-flexible polymer was first compressed into a condensed state from the initial coil state, and then the
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Effect of delay in transportation of extracellular glucose into cardiomyocytes under diabetic condition: a study through mathematical model. J. Biol. Phys. (IF 1.135) Pub Date : 2020-06-25 Phonindra Nath Das,Ajay Kumar,Nandadulal Bairagi,Samrat Chatterjee
A four-dimensional model was built to mimic the cross-talk among plasma glucose, plasma insulin, intracellular glucose and cytoplasmic calcium of a cardiomyocyte. A time delay was considered to represent the time required for performing various cellular mechanisms between activation of insulin receptor and subsequent glucose entry from extracellular region into intracellular region of a cardiac cell
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Application of the nonlinear methods in pneumocardiogram signals. J. Biol. Phys. (IF 1.135) Pub Date : 2020-06-11 Nazmi Yılmaz,Mahmut Akıllı,Mustafa Özbek,Tamer Zeren,K Gediz Akdeniz
In this work, the pneumocardiogram signals of nine rats were analysed by scale index, Boltzmann Gibbs entropy and maximum Lyapunov exponents. The scale index method, based on wavelet transform, was proposed for determining the degree of aperiodicity and chaos. It means that the scale index parameter is close to zero when the signal is periodic and has a value between zero and one when the signal is
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Simultaneous measurement of electrodermal activity components correlated with age-related differences. J. Biol. Phys. (IF 1.135) Pub Date : 2020-05-22 Dindar S Bari,Haval Y Yacoob Aldosky,Ørjan G Martinsen
Electrodermal activity (EDA) measurements are influenced by various factors. Age-related psychological and physiological changes may be considered as one of the possible factors which may influence EDA measurements. In order to properly investigate the effects of such factors on EDA, techniques of precisely and simultaneously recording more than one EDA parameter are recommended. This study aims to
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ModiBodies: A computational method for modifying nanobodies in nanobody-antigen complexes to improve binding affinity and specificity. J. Biol. Phys. (IF 1.135) Pub Date : 2020-05-16 Aysima Hacisuleyman,Burak Erman
Nanobodies are special derivatives of antibodies, which consist of single domain fragments. They have become of considerable interest as next-generation biotechnological tools for antigen recognition. They can be easily engineered due to their high stability and compact size. Nanobodies have three complementarity-determining regions, CDRs, which are enlarged to provide a similar binding surface to
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How the partial-slip boundary condition can influence the interpretation of the DLS and NTA data. J. Biol. Phys. (IF 1.135) Pub Date : 2020-04-25 Vladimir P Zhdanov
Dynamic light scattering (DLS) and nanoparticle tracking analysis (NTA) are widely used to determine the size of biological nanoparticles in liquid. In both cases, one first measures the nanoparticle diffusion coefficient and then converts it to the nanoparticle radius via the Stokes-Einstein relation. This relation is based on the no-slip boundary condition. Now, there is evidence that this condition
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Fate decisions mediated by crosstalk of autophagy and apoptosis in mammalian cells. J. Biol. Phys. (IF 1.135) Pub Date : 2020-04-06 Zhen Ge,Ruiqi Wang
Autophagy is an important cell activity which is the process of formation of autophagosomes, docking with lysosomes and degradation. The intrinsic pathway of apoptosis involves mitochondrial outer membrane permeabilization (MOMP) and cytochrome c release followed by caspase activation. Many molecules, e.g., Ca2+ and mTOR, and different stresses such as endoplasmic reticulum (ER) stress and nutritional
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Time-dependent enhancement of fluorescence from Rhodobacter capsulatus SB1003 and its critical dependence on concentration temperature and static magnetic field. J. Biol. Phys. (IF 1.135) Pub Date : 2020-03-19 Anirban Bose,Rajdeep Chowdhury,Somen Nandi,Sufi O Raja,Sanhita Ray,Kankan Bhattacharyya,Anjan Kr Dasgupta
Continuous exposure of 395 nm light increases the fluorescence emission intensity of photosynthetic purple non-sulphur bacteria, Rhodobacter capsulatus (SB1003). We show that such an increase in fluorescence emission of extracellular pigment complexes (PC) from these photosynthetic bacteria depends on the concentration of the pigment and temperature and can also be modulated by the static magnetic
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Avascular tumour growth models based on anomalous diffusion. J. Biol. Phys. (IF 1.135) Pub Date : 2020-03-17 Sounak Sadhukhan,S K Basu
In this study, we model avascular tumour growth in epithelial tissue. This can help us to understand that how an avascular tumour interacts with its microenvironment and what type of physical changes can be observed within the tumour spheroid before angiogenesis. This understanding is likely to assist in the development of better diagnostics, improved therapies, and prognostics. In biological systems
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Modeling the avoidance behavior of zooplankton on phytoplankton infected by free viruses. J. Biol. Phys. (IF 1.135) Pub Date : 2020-03-16 Saswati Biswas,Pankaj Kumar Tiwari,Francesca Bona,Samares Pal,Ezio Venturino
In any ecosystem, chaotic situations may arise from equilibrium state for different reasons. To overcome these chaotic situations, sometimes the system itself exhibits some mechanisms of self-adaptability. In this paper, we explore an eco-epidemiological model consisting of three aquatic groups: phytoplankton, zooplankton, and marine free viruses. We assume that the phytoplankton population is infected
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New planar light source for the induction and monitoring of photodynamic processes in vitro. J. Biol. Phys. (IF 1.135) Pub Date : 2020-03-13 R Bajgar,M Pola,J Hosik,P Turjanica,J Cengery,H Kolarova
We recently developed a new light source that allows for the continuous monitoring of light-induced changes using common spectrophotometric devices adapted for microplate analyses. This source was designed primarily to induce photodynamic processes in cell models. Modern light components, such as LED chips, were used to improve the irradiance homogeneity. In addition, this source forms a small hermetic
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On the emergence of cognition: from catalytic closure to neuroglial closure. J. Biol. Phys. (IF 1.135) Pub Date : 2020-03-04 Jose Luis Perez Velazquez
In an analogous manner as occurred during the development of a connected metabolism that at some point reached characteristics associated with what is called “life”―due mainly to a catalytic closure phenomenon when chemicals started to autocatalyze themselves forming a closed web of chemical reactions―it is here proposed that cognition and consciousness (or features associated with them) arose as a
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Electrothermal transport of third-order fluids regulated by peristaltic pumping. J. Biol. Phys. (IF 1.135) Pub Date : 2020-02-12 S Waheed,S Noreen,D Tripathi,D C Lu
The study of heat and electroosmotic characteristics in the flow of a third-order fluid regulated by peristaltic pumping is examined by using governing equations, i.e., the continuity equation, momentum equation, energy equation, and concentration equation. The wavelength is considered long compared to its height and a low Reynolds number is assumed. The velocity slip condition is employed. Analytical
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Using optical fibers to measure absorption in intact conifer leaves, relative numbers of chloroplasts, and pigment content. J. Biol. Phys. (IF 1.135) Pub Date : 2020-01-16 Ksenija Radotić,Thor B Melø
For investigations of ongoing processes in plants, such as photosynthesis in conifer leaves, nondestructive and noninvasive measuring techniques are needed. In this paper, a novel approach has been developed for the measurement of chloroplasts’ numbers and pigment contents in conifer leaves based on the measurements of leaf absorption spectra using optical fibers and an array spectrophotometer. To
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Gibbs free energy of protein-protein interactions correlates with ATP production in cancer cells. J. Biol. Phys. (IF 1.135) Pub Date : 2019-12-16 Stefan M Golas,Amber N Nguyen,Edward A Rietman,Jack A Tuszynski
In this paper, we analyze several cancer cell types from two seemingly independent angles: (a) the over-expression of various proteins participating in protein-protein interaction networks and (b) a metabolic shift from oxidative phosphorylation to glycolysis. We use large data sets to obtain a thermodynamic measure of the protein-protein interaction network, namely the associated Gibbs free energy
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A mechanical toy model linking cell-substrate adhesion to multiple cellular migratory responses. J. Biol. Phys. (IF 1.135) Pub Date : 2019-12-13 Masatomo Iwasa
During cell migration, forces applied to a cell from its environment influence the motion. When the cell is placed on a substrate, such a force is provided by the cell-substrate adhesion. Modulation of adhesivity, often performed by the modulation of the substrate stiffness, tends to cause common responses for cell spreading, cell speed, persistence, and random motility coefficient. Although the reasons
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The Fåhræus-Lindqvist effect in small blood vessels: how does it help the heart? J. Biol. Phys. (IF 1.135) Pub Date : 2019-12-02 Michela Ascolese,Angiolo Farina,Antonio Fasano
The Fåhræus-Lindqvist effect is usually explained from a physical point of view with the so-called Haynes’ marginal zone theory, i.e., migration of red blood cells (RBCs) to a core layer surrounded by an annular RBCs-free plasma layer. In this paper we show that the marginal layer, though causing a substantial reduction in flow resistance and increasing discharge, does not reduce the rate of energy
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Spatio-temporal aspects of the interplay of cancer and the immune system. J. Biol. Phys. (IF 1.135) Pub Date : 2019-11-26 Vladimir P Zhdanov
The conventional mean-field kinetic models describing the interplay of cancer and the immune system are temporal and predict exponential growth or elimination of the population of tumour cells provided their number is small and their effect on the immune system is negligible. More complex kinetics are associated with non-linear features of the response of the immune system. The generic model presented
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Heat damage of cytoskeleton in erythrocytes increases membrane roughness and cell rigidity. J. Biol. Phys. (IF 1.135) Pub Date : 2019-11-22 E Yu Parshina,A I Yusipovich,A R Brazhe,M A Silicheva,G V Maksimov
The intensity of erythrocyte membrane fluctuations was studied by laser interference microscopy (LIM), which provide information about mechanical properties of the erythrocyte membrane. Atomic force microscopy (AFM) was used to study erythrocyte surface relief; it is related to the cytoskeleton structure of erythrocyte membrane. Intact human erythrocytes and erythrocytes with a destroyed cytoskeleton
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Foreword. J. Biol. Phys. (IF 1.135) Pub Date : 2018-04-20 Roya Zandi,Cristian Micheletti,Rudolf Podgornik
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Correction to: Statistical crossover and nonextensive behavior of neuronal short-term depression. J. Biol. Phys. (IF 1.135) Pub Date : 2017-11-29 A J da Silva,S Floquet,D O C Santos
The authors apologize for the following errors published in the article. However, these errors do not modify the main assumptions in our work nor affects the discussion (interpretation) of the results.
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Erratum to: Computer model of unstirred layer and intracellular pH changes. Determinants of unstirred layer pH. J. Biol. Phys. (IF 1.135) Pub Date : 2017-03-23 Roger Marrannes
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Erratum to: Mutant SOD1 protein increases Nav1.3 channel excitability. J. Biol. Phys. (IF 1.135) Pub Date : 2016-06-09 Elif Kubat Öktem,Karen Mruk,Joshua Chang,Ata Akin,William R Kobertz,Robert H Brown
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Quantum-like behavior without quantum physics III : Logic and memory. J. Biol. Phys. (IF 1.135) Pub Date : 2019-10-15 Stephen Selesnick,Gualtiero Piccinini
We employ some of the machinery developed in previous work to investigate the inferential and memory functions of quantum-like neural networks. We set up a logical apparatus to implement this in the form of a Gentzen sequent calculus which codifies some of the combinatory rules for the state spaces of the neuronal networks introduced earlier. We discuss memory storage in this context and along the
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Influence of electromagnetic waves, with maxima in the green or red range, on the morphofunctional properties of multipotent stem cells. J. Biol. Phys. (IF 1.135) Pub Date : 2019-10-08 A S Chernov,D A Reshetnikov,G K Ristsov,Yu A Kovalitskaya,A M Ermakov,A A Manokhin,A V Simakin,R G Vasilov,S V Gudkov
This paper examines the effect of electromagnetic waves, with maxima in the green or red regions of the spectrum, on the morphofunctional state of multipotent mesenchymal stromal cells. The illumination regimes used in our experiments did not lead to any substantial heating of the samples; the physical parameters of the lighting were carefully monitored. When the samples were illuminated with a green
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Nanoparticles without and with protein corona: van der Waals and hydration interaction. J. Biol. Phys. (IF 1.135) Pub Date : 2019-08-20 Vladimir P Zhdanov
The van der Waals (vdW) interaction between nanoparticles (NPs) in general, and especially between metal NPs, may be appreciable, and may result in nanoparticle aggregation. In biofluids, NPs become rapidly surrounded by a protein corona (PC). Here, the vdW and hydration interaction of NPs with and without PC are compared in detail. The focus is on two widely used types of NPs fabricated of SiO2 and
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Ellipsometric-based novel DNA biosensor for label-free, real-time detection of Bordetella parapertussis. J. Biol. Phys. (IF 1.135) Pub Date : 2019-08-02 S Rafique,M Idrees,H Bokhari,A S Bhatti
Pertussis (or whooping cough) is a contagious disease mainly affecting infants and children and predominantly caused by Bordetella pertussis followed by Bordetella parapertussis. B. parapertussis causes a milder cough but usually symptomatically appears like B. pertussis infection. Thus the epidemiology of illness caused by B. parapertussis is not well understood. In this study, a sensitive and specific
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Elastic modulus of Dictyostelium is affected by mechanotransduction. J. Biol. Phys. (IF 1.135) Pub Date : 2019-07-30 Yan Wu,Kate M Cooper
The stiffness of adherent mammalian cells is regulated by the elasticity of substrates due to mechanotransduction via integrin-based focal adhesions. Dictyostelium discoideum is an ameboid protozoan model organism that does not carry genes for classical integrin and can adhere to substrates without forming focal adhesions. It also has a life cycle that naturally includes both single-cellular and multicellular
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Chemotactic effects in reaction-diffusion equations for inflammation. J. Biol. Phys. (IF 1.135) Pub Date : 2019-07-15 Cordula Reisch,Dirk Langemann
Predator–prey systems are used to model time-dependent virus and lymphocyte population during a liver infection and to discuss the influence of chemotactic behavior on the chronification tendency of such infections. Therefore, a model family of reaction-diffusion equations is presented, and the long-term behavior of the solutions is estimated by a critical value containing the reaction strength, the
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Boolean gene regulatory network model of centromere function in Saccharomyces cerevisiae. J. Biol. Phys. (IF 1.135) Pub Date : 2019-06-07 Emir Haliki,Nursen Alpagut Keskin,Ozgur Masalci
Centromeres, a highly conserved locus of eukaryotic chromosomes, have critical function for genome stability and integrity. Because their centromeric DNA sequences are necessary and sufficient for kinetochore recruitment and DNA segregation, point centromeres of Saccharomyces cerevisiae chromosomes provide an attractive system for the study of the regulation of centromere function. Using the mathematical
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Can diatom girdle band pores act as a hydrodynamic viral defense mechanism? J. Biol. Phys. (IF 1.135) Pub Date : 2019-05-28 J W Herringer,D Lester,G E Dorrington,G Rosengarten
Diatoms are microalgae encased in highly structured and regular frustules of porous silica. A long-standing biological question has been the function of these frustules, with hypotheses ranging from them acting as photonic light absorbers to being particle filters. While it has been observed that the girdle band pores of the frustule of Coscinodiscus sp. resemble those of a hydrodynamic drift ratchet
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Active fluid with Acidithiobacillus ferrooxidans: correlations between swimming and the oxidation route. J. Biol. Phys. (IF 1.135) Pub Date : 2019-05-09 Juan D Torrenegra,Liliam C Agudelo-Morimitsu,Marco A Márquez-Godoy,Juan P Hernández-Ortiz
To explore engineering platforms towards ‘active bacterial baths’, we grow and characterize native and commercial strains of Acidithiobacillus ferrooxidans to promote swimming locomotion. Three different energy sources were used, namely elemental sulfur, ferrous sulfate, and pyrite. The characteristics of the culture, such as pH, Eh, and the concentration of cells and ions, are monitored to seek correlations
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A hemodynamic model with a seepage condition and fluid-structure interactions for blood flow in arteries with symmetric stenosis. J. Biol. Phys. (IF 1.135) Pub Date : 2019-05-06 Fan He,Lu Hua,Li-Jian Gao
To strengthen the detailed understanding of arterial stenosis, we construct a novel hemodynamic model. Frequently used symmetric stenosis is employed in this work. Being different from a traditional model, this numerical model adopts microcirculation resistance as an outlet boundary condition, which is called a seepage condition. Meanwhile, fluid–structure interactions are used in the numerical simulation
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Monitoring of lysozyme thermal denaturation by volumetric measurements and nanoDSF technique in the presence of N-butylurea. J. Biol. Phys. (IF 1.135) Pub Date : 2019-03-22 Joanna Krakowiak,Magdalena Krajewska,Jarosław Wawer
The results of thermal studies of denaturation of hen egg white lysozyme (HEWL) in water and an aqueous solution of N-butylurea (BU) are presented. High-precision densimetric measurements were used to characterize and analyze the changes of the specific volume, v, during temperature elevation. The temperature of the midpoint of protein denaturation was also determined by nanoDSF technique (differential
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Global diffusion limitations during the initial phase of the formation of a protein corona around nanoparticles. J. Biol. Phys. (IF 1.135) Pub Date : 2019-03-20 Vladimir P Zhdanov
Herein, I illustrate analytically how the global diffusion limitations can influence the first phase of the protein-corona formation at nanoparticles under conditions of intravascular injection. In particular, the concentrations of proteins near the boundaries of the injection region are shown to be comparable with those far from the region. In contrast, the concentrations of proteins inside the injection
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Echo dephasing and heat capacity from constrained and unconstrained dynamics of triiodothyronine nuclear receptor protein. J. Biol. Phys. (IF 1.135) Pub Date : 2019-02-27 Tika Ram Lamichhane,Sharma Paudel,Binod Kumar Yadav,Hari Prasad Lamichhane
The objective of this study is to observe the echo feature curves, vibrational dephasing, and heat capacity of a protein–hormone system taking thyroid hormone receptor-beta (THR-β) as an example. Constrained and unconstrained molecular dynamics simulations are performed by implementing the theory of velocity reassignments to probe the phase coherent state in terms of echo pulses. The constrained vibrations
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Comparative studies on the interaction between biogenic polyamines and bovine intestinal alkaline phosphatases: spectroscopic and theoretical approaches. J. Biol. Phys. (IF 1.135) Pub Date : 2019-02-07 Pegah Salehian,Behzad Shareghi,Mansoore Hosseini-Koupaei
In this work, the effect of two organic polyamines (spermine and spermidine) on the fluorescence intensity and activity of bovine intestinal alkaline phosphatase (BIALP) are investigated. The interaction of BIALP with spermine and spermidine was studied in a diethanolamine buffer with 0.5 mM magnesium chloride (pH 9.8) and at two temperatures by using the fluorescence quenching method. Furthermore
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Size-dependent inhibition of bacterial growth by chemically engineered spherical ZnO nanoparticles. J. Biol. Phys. (IF 1.135) Pub Date : 2019-02-05 Qurat-Ul-Ain Naqvi,Amber Kanwal,S Qaseem,M Naeem,S Rizwan Ali,M Shaffique,M Maqbool
The antibacterial effect of ZnO nanoparticles is tested against Staphylococcus aureus, (a Gram-positive pathogenic bacterium) from a particle-size, concentration, and surface-defects point of view. Activation of antibacterial activity was achieved by standard well diffusion agar and minimum inhibitory concentration procedures. Our results show that smaller-sized particles are more effective inhibitors
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Modeling the interplay between DNA-PK, Artemis, and ATM in non-homologous end-joining repair in G1 phase of the cell cycle. J. Biol. Phys. (IF 1.135) Pub Date : 2019-02-01 Maryam Rouhani
Modeling a biological process equips us with more comprehensive insight into the process and a more advantageous experimental design. Non-homologous end joining (NHEJ) is a major double-strand break (DSB) repair pathway that occurs throughout the cell cycle. The objective of the current work is to model the fast and slow phases of NHEJ in G1 phase of the cell cycle following exposure to ionizing radiation
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Dynamics and binding interactions of peptide inhibitors of dengue virus entry. J. Biol. Phys. (IF 1.135) Pub Date : 2019-01-24 Diyana Mohd Isa,Sek Peng Chin,Wei Lim Chong,Sharifuddin M Zain,Noorsaadah Abd Rahman,Vannajan Sanghiran Lee
In this study, we investigate the binding interactions of two synthetic antiviral peptides (DET2 and DET4) on type II dengue virus (DENV2) envelope protein domain III. These two antiviral peptides are designed based on the domain III of the DENV2 envelope protein, which has shown significant inhibition activity in previous studies and can be potentially modified further to be active against all dengue
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Anisotropic aspects of solubility behavior in the demineralization of cortical bone revealed by XRD analysis. J. Biol. Phys. (IF 1.135) Pub Date : 2019-01-05 Sergei Danilchenko,Aleksei Kalinkevich,Mykhailo Zhovner,Vladimir Kuznetsov,He Li,Jufang Wang
Dissolution of cortical bone mineral under demineralization in 0.1 M HCl and 0.1 M EDTA solutions is studied by X-ray diffraction (XRD). The bone specimens (in the form of planar oriented pieces) were cut from a diaphysial fragment of a mature mammal bone so that a cross-section surface and a longitudinal section surface could be analyzed individually. This permitted to compare the dissolution behavior
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Mathematical expression of membrane potential based on Ling's adsorption theory is approximately the same as the Goldman-Hodgkin-Katz equation. J. Biol. Phys. (IF 1.135) Pub Date : 2018-11-03 Hirohisa Tamagawa
The Goldman–Hodgkin–Katz equation (GHK equation), one of the most successful achievements of membrane theory in electrophysiology, can precisely predict the membrane potential. Its conceptual foundation lies in the idea that the transmembrane ion transport across the plasma membrane is responsible for the membrane potential generation. However, the potential virtually equivalent to the membrane potential
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Impulsive control of a nonlinear dynamical network and its application to biological networks. J. Biol. Phys. (IF 1.135) Pub Date : 2018-10-31 Min Luo,Jianfeng Jiao,Ruiqi Wang
The control of nonlinear dynamical systems is always a notable problem in science. According to control theory, suitable inputs for a controllable dynamical system are critical. Previous studies have shown some principles to determine control nodes and design control function. In this work, we propose a new control strategy of nonlinear systems by constructing impulsive control functions, i.e., we
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Expanding the flexibility of dynamics simulation on different size particle-particle interactions by dielectrophoresis. J. Biol. Phys. (IF 1.135) Pub Date : 2018-10-26 Sheng Hu,Rongrong Fu
In this paper, we perform flexible and reliable dynamics simulations on different sizes of two or more particles’ interactive motions, where they encounter positive or negative dielectrophoresis (DEP) forces. The particles with identical or non-identical size are in close proximity suspended freely in a solution under a homogeneous electric field. According to the description of classic dipole moment
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Physiological and biochemical responses of Makhana (Euryale ferox) to gamma irradiation. J. Biol. Phys. (IF 1.135) Pub Date : 2018-10-25 Nitish Kumar,Shweta Rani,Gaurav Kuamr,Swati Kumari,Indu Shekhar Singh,S Gautam,Binod Kumar Choudhary
The impact of gamma irradiation on growth and physiology of Euryale ferox was described in the present investigation. E. ferox is an underutilized aquatic food crop that grows in shallow-water bodies in lower Assam regions and north Bihar of India. The seeds of E. ferox were irradiated with different doses of gamma irradiation ranging from 0 to 500 Gy. It was observed that the germination and survival
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Limit to steady-state aerobic power of skeletal muscles. J. Biol. Phys. (IF 1.135) Pub Date : 2018-10-02 A Paglietti
Like any other kind of cell, muscle cells produce energy by oxidizing the fuel substrate that they absorb together with the needed oxygen from the surroundings. Oxidation occurs entirely within the cell. It means that the reactants and products of reaction must at some time be dissolved in the cell’s cytosol. If a cell operates at steady state, its cytosol composition remains constant. Therefore, the
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Dynamics of blood flow: modeling of Fåhraeus and Fåhraeus-Lindqvist effects using a shear-induced red blood cell migration model. J. Biol. Phys. (IF 1.135) Pub Date : 2018-09-15 Rachid Chebbi
Blood flow in micro capillaries of diameter approximately 15–500 μm is accompanied with a lower tube hematocrit level and lower apparent viscosity as the diameter decreases. These effects are termed the Fåhraeus and Fåhraeus–Lindqvist effects, respectively. Both effects are linked to axial accumulation of red blood cells. In the present investigation, we extend previous works using a shear-induced
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Modeling of a single nanoparticle interaction with the human blood plasma proteins. J. Biol. Phys. (IF 1.135) Pub Date : 2018-09-12 Vladas Skakauskas,Pranas Katauskis
When nanoparticles are introduced into a physiological environment, proteins and lipids immediately cover their surface, forming a protein “corona”. It is well recognized that the corona structure influences the biological response of the body. Two deterministic models for corona formation of the human blood serum proteins around a single nanoparticle are presented and studied numerically in this paper
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Aqueous solution interactions with sex hormone-binding globulin and estradiol: a theoretical investigation. J. Biol. Phys. (IF 1.135) Pub Date : 2018-07-05 A J da Silva,E S Dos Santos
Sex hormone-binding globulin (SHBG) is a binding protein that regulates the availability of steroid hormones in the plasma. Although best known as a steroid carrier, recent studies have associated SHBG in modulating behavioral aspects related to sexual receptivity. Among steroids, estradiol (17β-estradiol, oestradiol or E2), documented as the most active endogenous female hormone, exerts important
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Charge transport in a DNA model with solvent interaction. J. Biol. Phys. (IF 1.135) Pub Date : 2018-07-03 H Ngoubi,G H Ben-Bolie,T C Kofané
The charge transport in the modified DNA model is studied by taking into account the factor of solvent and the effect of coupling motions of nucleotides. We report on the presence of the modulational instability (MI) of a plane wave for charge migration in DNA and the generation of soliton-like excitations in DNA nucleotides. By applying the continuum approximation, we show that the original differential-difference
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