1,965 research outputs found
Thermodynamic competition between membrane protein oligomeric states
Self-assembly of protein monomers into distinct membrane protein oligomers
provides a general mechanism for diversity in the molecular architectures, and
resulting biological functions, of membrane proteins. We develop a general
physical framework describing the thermodynamic competition between different
oligomeric states of membrane proteins. Using the mechanosensitive channel of
large conductance as a model system, we show how the dominant oligomeric states
of membrane proteins emerge from the interplay of protein concentration in the
cell membrane, protein-induced lipid bilayer deformations, and direct
monomer-monomer interactions. Our results suggest general physical mechanisms
and principles underlying regulation of protein function via control of
membrane protein oligomeric state.Comment: 7 pages, 5 figure
Stochastic single-molecule dynamics of synaptic membrane protein domains
Motivated by single-molecule experiments on synaptic membrane protein
domains, we use a stochastic lattice model to study protein reaction and
diffusion processes in crowded membranes. We find that the stochastic
reaction-diffusion dynamics of synaptic proteins provide a simple physical
mechanism for collective fluctuations in synaptic domains, the molecular
turnover observed at synaptic domains, key features of the single-molecule
trajectories observed for synaptic proteins, and spatially inhomogeneous
protein lifetimes at the cell membrane. Our results suggest that central
aspects of the single-molecule and collective dynamics observed for membrane
protein domains can be understood in terms of stochastic reaction-diffusion
processes at the cell membrane.Comment: Main text (7 pages, 4 figures, 1 table) and supplementary material (3
pages, 3 figures
Controlling the shape of membrane protein polyhedra
Membrane proteins and lipids can self-assemble into membrane protein
polyhedral nanoparticles (MPPNs). MPPNs have a closed spherical surface and a
polyhedral protein arrangement, and may offer a new route for structure
determination of membrane proteins and targeted drug delivery. We develop here
a general analytic model of how MPPN self-assembly depends on bilayer-protein
interactions and lipid bilayer mechanical properties. We find that the
bilayer-protein hydrophobic thickness mismatch is a key molecular control
parameter for MPPN shape that can be used to bias MPPN self-assembly towards
highly symmetric and uniform MPPN shapes. Our results suggest strategies for
optimizing MPPN shape for structural studies of membrane proteins and targeted
drug delivery
Dipoles in thin sheets
A flat elastic sheet may contain pointlike conical singularities that carry a
metrical "charge" of Gaussian curvature. Adding such elementary defects to a
sheet allows one to make many shapes, in a manner broadly analogous to the
familiar multipole construction in electrostatics. However, here the underlying
field theory is non-linear, and superposition of intrinsic defects is
non-trivial as it must respect the immersion of the resulting surface in three
dimensions. We consider a "charge-neutral" dipole composed of two conical
singularities of opposite sign. Unlike the relatively simple electrostatic
case, here there are two distinct stable minima and an infinity of unstable
equilibria. We determine the shapes of the minima and evaluate their energies
in the thin-sheet regime where bending dominates over stretching. Our
predictions are in surprisingly good agreement with experiments on paper
sheets.Comment: 20 pages, 5 figures, 2 table
Steady state forced response of a mechanical oscillator with combined parametric excitation and clearance type non-linearity
International audienceA mechanical system exhibiting combined parametric excitation and clearance type non-linearity is examined analytically and experimentally in an effort to explain complex behavior that is commonly observed in the steady state forced response of rotating machines. The specific case of a preloaded mechanical oscillator having a periodically time-varying stiffness function and subject to a symmetric backlash condition is considered. A generalized solution methodology is proposed based on the harmonic balance method. The resulting non-linear algebraic equations are solved by using a direct Newton-Raphson technique, in which a closed form Jacobian matrix is computed using frequency domain methods. Analytical solutions are validated by comparison with numerical integration results and experimental measurements obtained from a gear dynamics test rig
Human Resources Management using Interval Valued Intuitionistic Fuzzy Analytic Hierarchy Process
Primjena metode odzivnih površina i neuronskih mreža za modeliranje i procjenu otpornosti na abrazijsko trošenje Poly oxy metilena
In this study, abrasive wear behaviour of poly oxy methylenes (POM) under various testing conditions was investigated. A central composite design (CCD) was used to describe response and to estimate the parameters in the model. Response surface methodology (RSM) was adopted to obtain an empirical model of wear loss as a function of applied load and sliding distance. Also, a neural network (NN) model was developed for the prediction and testing of the results. Finally, a comparison was made between the results obtained from RSM and NN.U radu je istraživano abrazijsko trošenje poly oxy metilena (POM), za različite uvjete ispitivanja. Za procjenu parametara modela i odziva, primijenjen je centralno kompozitni plan pokusa. Primjenom metode odzivnih površina dobiven je matematički model ovisnosti gubitka mase o primijenjenom opterećenju i putu klizanja. Također, primjenom neuronskih mreža, razvijen je model za procjenu i testiranje rezultata. Na kraju su uspoređeni rezultati modela, dobiveni metodom odzivnih površina i primjenom neuronskih mreža
ELECTRE I Method Using Hesitant Linguistic Term Sets: An Application to Supplier Selection
Decision making is a common process in human activities. Every person or organization needs to make decisions besides dealing with uncertainty and vagueness associated with human cognition. The theory of fuzzy logic provides a mathematical base to model the uncertainities. Hesitant fuzzy linguistic term set (HFLTS) creates an appropriate method to deal with uncertainty in decision making. Managerial decision making generally implies that decision making process conducts multiple and conflicting criteria. Multi criteria decision analysis (MCDA) is a widely applied decision making method. Outranking methods are one type of MCDA methods which facilitate the decision making process through comparing binary relations in order to rank the alternatives. Elimination et Choix Traduisant la Réalité (ELECTRE), means elimination and choice that translates reality, is an outranking method. In this paper, an extended version of ELECTRE I method using HFLTS is proposed. Finally, a real case problem is provided to illustrate the HFLTS-ELECTRE I method
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