Results 21 to 30 of about 6,439 (154)

Electronic Energy Migration in Microtubules [PDF]

arXiv, 2022
The repeating arrangement of tubulin dimers confers great mechanical strength to microtubules, which are used as scaffolds for intracellular macromolecular transport in cells and exploited in biohybrid devices. The crystalline order in a microtubule, with lattice constants short enough to allow energy transfer between amino acid chromophores, is ...
arxiv  

Modeling of the energy transfer process in microtubules [PDF]

arXiv, 2023
In the work the process of the energy transfer in the cell microtubules is simulated. A system of tryptophans connected by Coulomb dipole-dipole interaction is discussed as the energy carriers. The work models the conditions under which the migration of energy along the tryptophan chain in the microtubule is possible.
arxiv  

On the Sensitivity of Protein Data Bank Normal Mode Analysis: An Application to GH10 Xylanases [PDF]

Phys. Biol. 12 (2015) 066013, 2015
Protein data bank entries obtain distinct, reproducible flexibility characteristics determined by normal mode analyses of their three dimensional coordinate files. We study the effectiveness and sensitivity of this technique by analyzing the results on one class of glycosidases: family 10 xylanases.
arxiv   +1 more source

Ion-Induced Dipole Interactions and Fragmentation Times : C$α$ -C$β$ Chromophore Bond Dissociation Channel [PDF]

Journal of Physical Chemistry Letters, 2015, 6, pp.2070, 2015
The fragmentation times corresponding to the loss of the chromophore (C$\alpha$-- C$\beta$ bond dissociation channel) after photoexcitation at 263 nm have been investigated for several small peptides containing tryptophan or tyrosine. For tryptophan-containing peptides, the aromatic chromophore is lost as an ionic fragment (m/z 130), and the ...
arxiv   +1 more source

NMDA receptor activation mediates lipopolysaccharide-induced depressive-like behavior

European Journal of Psychotraumatology, 2012
Background : Inflammation associated with cancer and induced by cancer therapy is associated with clinical signs of sickness behavior that can culminate in the development of symptoms of depression. Intraperitoneal administration of lipopolysaccharide to
Adam Walker, Robin Smith, Bret Beenders, Keith Kelley, Robert Dantzer   +4 more
doaj   +1 more source

Rubisco function, evolution, and engineering [PDF]

arXiv, 2022
Carbon fixation is the process by which CO2 is converted from a gas into biomass. The Calvin Benson Bassham (CBB) cycle is the dominant carbon fixation pathway on earth, driving >99.5% of the ~120 billion tons of carbon that are "fixed" as sugar, by plants, algae and cyanobacteria.
arxiv  

SlTDC modulates photosynthesis of senescent leaves in tomato

Horticulture Advances
Melatonin (MT) is a key regulator in plants’ response to leaf senescence induced by aging or various abiotic stresses. Here, we demonstrated that darkness and leaf aging enhance endogenous MT levels by upregulating key genes involved in MT synthesis ...
Yanan Wang, Tongtong Jing, Xutao Liu, Xizhen Ai, Huangai Bi   +4 more
doaj   +1 more source

Evaluating force field accuracy with long-time simulations of a tryptophan zipper peptide [PDF]

, 2010
We have combined a custom implementation of the fast multiple-time-stepping LN integrator with parallel tempering to explore folding properties of small peptides in implicit solvent on the time scale of microseconds. We applied this algorithm to the synthetic {\beta}-hairpin trpzip2 and one of its sequence variants W2W9.
arxiv   +1 more source

A superconducting NbN detector for neutral nanoparticles [PDF]

Nanotechnology 20, 45501, 2009, 2014
We present a proof-of-principle study of superconducting single photon detectors (SSPD) for the detection of individual neutral molecules/nanoparticles at low energies. The new detector is applied to characterize a laser desorption source for biomolecules and it allows to retrieve the arrival time distribution of a pulsed molecular beam containing the ...
arxiv   +1 more source

Sampling the protonation states: pH-dependent UV absorption spectrum of a polypeptide dyad [PDF]

, 2017
When a chromophore interacts with titrable molecular sites, the modeling of its photophysical properties requires to take into account all their possible protonation states. We have developed a multi-scale protocol, based on constant-pH molecular dynamics simulations coupled to QM/MM excitation energy calculations, aimed at sampling both the phase ...
arxiv   +1 more source