For molecular systems exhibiting free energy

barriers exceeding a few k(B)T, inadequate sampling of the barrier regions between stable or metastable basins can lead to a poor global characterization of the free energy landscape. We present an adaptation of a nonlinear dimensionality reduction technique known as the diffusion map that extends its applicability to biased umbrella sampling simulation trajectories in which restraining EVP4593 potentials are employed to drive the system into high free energy regions and improve sampling of phase space. We then propose a bootstrapped approach to iteratively discover good low-dimensional parametrizations by interleaving successive rounds of umbrella sampling and diffusion mapping, and we illustrate the technique through a study of alanine dipeptide in explicit solvent. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3574394]“
“Objective: Functional outcomes are important in children with cochlear implants (Cl) and additional disabilities as studies on auditory skill and speech/language development may not identify functional

benefits from implantation. This study sought to measure functional performance skills of young children with developmental disabilities post-Cl.\n\nMethods: Eight children with cognitive disabilities undergoing cochlear implantation were enrolled in a prospective study of language and functional abilities; 6 with 1 year follow-up were included in the Fer-1 analysis. Functional performance was measured using Pediatric Evaluation learn more of Disability Inventory (PEDI), providing standardized (mean: 50) and scaled scores (range: 0-100) of functional domains: Self-Care, Mobility and Social Function. The PEDI was administered pre-implant, 6 and 12 months post-implantation along with language testing at the

same intervals.\n\nResults: All children had cognitive disability; 5 also had motor delay. The ages at Cl ranged from 13.8 to 134 months. For functional abilities, children did not make significant changes in domain-specific standard scores over 1 year. Children made progress in scaled scores by 1-year post-implant. The largest increase for all domains occurred in the first 6 months (7-11.5 point increase). For language abilities, children made a median 5.5-month increase in receptive language age (p = 0.06) and 5-month increase in expressive language age (p = 0.03) in the first year post-CI with no change in language quotients. Receptive language level was significantly (p < 0.05) associated with increasing scores in the domains of Self-Care and Social Function.\n\nConclusions: This is the first study to measure daily functional abilities in children with implants and disabilities using a standardized tool.