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Search Results: 1 - 10 of 304194 matches for " V. N. Tsaneva "
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Growth of Strongly Biaxially Aligned MgB2 Thin Films on Sapphire by Post-annealing of Amorphous Precursors
A. Berenov,Z. Lockman,X. Qi,Y. Bugoslavsky,L. F. Cohen,M. -H. Jo,N. A. Stelmashenko,V. N. Tsaneva,M. Kambara,N. Hari Babu,D. A. Cardwell,M. G. Blamire,J. L. MacManus-Driscoll
Physics , 2001, DOI: 10.1063/1.1424070
Abstract: MgB2 thin films were cold-grown on sapphire substrates by pulsed laser deposition (PLD), followed by post-annealing in mixed, reducing gas, Mg-rich, Zr gettered, environments. The films had Tcs in the range 29 K to 34 K, Jcs (20K, H=0) in the range 30 kA/cm2 to 300 kA/cm2, and irreversibility fields at 20 K of 4 T to 6.2 T. An inverse correlation was found between Tc and irreversibility field. The films had grain sizes of 0.1-1 micron and a strong biaxial alignment was observed in the 950C annealed film.
ruvA Mutants That Resolve Holliday Junctions but Do Not Reverse Replication Forks
Zeynep Baharoglu,Alison Sylvia Bradley,Marie Le Masson,Irina Tsaneva,nédicte Michel
PLOS Genetics , 2008, DOI: 10.1371/journal.pgen.1000012
Abstract: RuvAB and RuvABC complexes catalyze branch migration and resolution of Holliday junctions (HJs) respectively. In addition to their action in the last steps of homologous recombination, they process HJs made by replication fork reversal, a reaction which occurs at inactivated replication forks by the annealing of blocked leading and lagging strand ends. RuvAB was recently proposed to bind replication forks and directly catalyze their conversion into HJs. We report here the isolation and characterization of two separation-of-function ruvA mutants that resolve HJs, based on their capacity to promote conjugational recombination and recombinational repair of UV and mitomycin C lesions, but have lost the capacity to reverse forks. In vivo and in vitro evidence indicate that the ruvA mutations affect DNA binding and the stimulation of RuvB helicase activity. This work shows that RuvA's actions at forks and at HJs can be genetically separated, and that RuvA mutants compromised for fork reversal remain fully capable of homologous recombination.
Bacterial Secretion and the Role of Diffusive and Subdiffusive First Passage Processes
Frank Marten, Krasimira Tsaneva-Atanasova, Luca Giuggioli
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0041421
Abstract: By funneling protein effectors through needle complexes located on the cellular membrane, bacteria are able to infect host cells during type III secretion events. The spatio-temporal mechanisms through which these events occur are however not fully understood, due in part to the inherent challenges in tracking single molecules moving within an intracellular medium. As a result, theoretical predictions of secretion times are still lacking. Here we provide a model that quantifies, depending on the transport characteristics within bacterial cytoplasm, the amount of time for a protein effector to reach either of the available needle complexes. Using parameters from Shigella flexneri we are able to test the role that translocators might have to activate the needle complexes and offer semi-quantitative explanations of recent experimental observations.
Dynamical systems analysis of spike-adding mechanisms in transient bursts
Jakub Nowacki, Hinke M Osinga, Krasimira Tsaneva-Atanasova
The Journal of Mathematical Neuroscience , 2012, DOI: 10.1186/2190-8567-2-7
Abstract:
Toward a synergetic model of postural coordination dynamics
Rooke Ed,Bardy Benoit,Tsaneva-Atanasova Krasimira
BIO Web of Conferences , 2011, DOI: 10.1051/bioconf/20110100077
Abstract: In the present study the authors develop a double inverted-pendulum intrapersonal model for posture in the Sagittal plane. A novel synergetic approach is taken to successfully reproduce qualitative features of experimental data. The HKB model is investigated and modi ed into a more general type of ”excitator” to create suitable dynamics for this application. Bifurcation analysis of HKB couplings revealed regimes where appropriate asymmetries exist in the xed points. The ndings suggest that this approach produces an innovative and viable solution for postural coordination dynamics.
Effects of time-delay in a model of intra- and inter-personal motor coordination
Piotr S?owiński,Krasimira Tsaneva-Atanasova,Bernd Krauskopf
Physics , 2015,
Abstract: Motor coordination is an important feature of intra- and inter-personal interactions, and several scenarios --- from finger tapping to human-computer interfaces --- have been investigated experimentally. In the 1980, Haken, Kelso and Bunz formulated a coupled nonlinear two-oscillator model, which has been shown to describe many observed aspects of coordination tasks. We present here a bifurcation study of this model, where we consider a delay in the coupling. The delay is shown to have a significant effect on the observed dynamics. In particular, we find a much larger degree of bistablility between in-phase and anti-phase oscillations in the presence of a frequency detuning.
The Conservation of Energy Space-Time Metric for Space Outside Matter  [PDF]
V. N. E. Robinson
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.48149
Abstract:

By using experimentally determined measurements of potential energy together with the principle of conservation of energy and solving directly, the space-time geometry equation for space outside matter is obtained. That equation fits all the experimental observations that support the accepted Schwarzschild metric, yet predicts there isn’t a singularity at the Schwarzschild radius. The accepted Schwarzschild metric is the first approximation of the conservation of energy space-time metric. No observation yet made can distinguish between the predictions of the two metrics.

Connecting Productivity with Social Capital via Daily Mobile Phone Logs  [PDF]
B. Padmaja, V. V. Rama Prasad, K. V. N. Sunitha
Social Networking (SN) , 2016, DOI: 10.4236/sn.2016.52007
Abstract: Human behavior and their social interactions can be quantified and modeled with the use of smart phones and any wearable badges which senses and captures real-life interactions. In traditional social sciences, such information was gathered by conducting surveys. However in digital era, smart phones are regarded as a popular tool which automatically senses much human information to quantify our lives. Reality mining gives a clear picture of a human being and its social relations. Social Network Analysis (SNA) is a powerful research tool which provides a comprehensive analysis on ego-alters communications with their individual productivity within a community. In this paper, various popular measures of social network analysis have used to study a closed community through their mobile call logs for a period of time. We experimented various social network measures both on daily basis and also over a period of time. The pattern shows that the relationships and interaction between ego-alter ties have more productive benefits. Using Pearsoncorrelation analysis, we observed that significant (positive) correlation exists between various network properties and their productivity. Results showed that degree (size) has the strongest positive correlation with average productivity, followed by effective size, efficiency, constraint, hierarchy, and k-core of an individual. Density and betweenness centrality have a weak, negative correlation with productivity. Hence social capital has a significant influence on human productivity.
Qualitative analysis of re mineralized carious lesions subjected to fluoride supplement through confocal laser scanning microscope  [PDF]
K. Shashikala, N. V. Sheela
Open Journal of Stomatology (OJST) , 2011, DOI: 10.4236/ojst.2011.13010
Abstract: Aim: 1] Comparative evaluation of the linear depth of induced remineralized lesions after subjecting to fluoride supplements and 2] To assess the average fluorescence at both the demineralized and the remi-neralized zones in all the three study groups under confocal laser scanning microscope. Method: Forty five sound human premolars extracted for orthodon-tic reasons were decoronated 1 mm below the ce-mento-enamel junction and coated with nail varnish except for a 3 × 3 mm window on the buccal surface. The samples were placed in 50 ml of de mineralizing solution at pH 4.6 for 96 hours. Following deminera-lization, the lower half of the 3 × 3 mm window in all the samples were covered with nail varnish to serve as control. The samples were randomly divided into three groups of fifteen teeth each (n = 15) and speci-mens in group A[Nfd] were remineralized using non-fluoridated dentifrice [control], those in groups B [Fd5] and group C [Fd10] using 500 ppm and 1000 ppm of fluoride containing dentifrice, respectively. The specimens were subjected to a 20 day reminera-lization treatment regimen and were sectioned into 100 µm thick sections and two images were captured on the buccal surface from either side of the midpoint of occluso-cervical length using confocal laser scan-ning microscope [CLSM]. Results: were tabulated and statistically analyzed by Anova. Study concluded that 1000 ppm fluoridated dentifrice showed a greater degree of remineralization than other groups and confocal laser scanning microscopes gives promising results in the diagnosis of early enamel lesions over the conventional methods.
Critical Parameters and Magnetocaloric Effect of the La5/8Ca3/8Mn0.9750Pd0.025O3 Compound  [PDF]
L. V. Bau, N. M. An
Materials Sciences and Applications (MSA) , 2014, DOI: 10.4236/msa.2014.512086
Abstract: The La5/8Ca3/8Mn0.9750Pd0.025O3 compound was studied using DC magnetization measurements. The data were analyzed in the paramagnetic-ferromagnetic phase transition region by the Arrott plot method. The results show the Curie temperature TC ~ 247.8 K and the critical exponents of b = 0.48633, g = 1.18623 and d = 3.431682. The values of the critical exponents are between the mean- field theory and 3D Ising model. The magnetocaloric value is ~5 J/kgK, extracted from the M(H) curves.
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