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https://www.readbyqxmd.com/read/28237494/multiple-lhcii-antennae-can-transfer-energy-efficiently-to-a-single-photosystem-i
#1
Inge Bos, Kaitlyn M Bland, Lijin Tian, Roberta Croce, Laurie K Frankel, Herbert van Amerongen, Terry M Bricker, Emilie Wientjes
Photosystems I and II (PSI and PsiI) work in series to drive oxygenic photosynthesis. The two photosystems have different absorption spectra, therefore changes in light quality can lead to imbalanced excitation of the photosystems and a loss in photosynthetic efficiency. In a short-term adaptation response termed state-transitions, excitation energy is directed to the light-limited photosystem. In higher plants a special pool of LHCII antennae, which can be associated with either PSI or PsiI, participate in these state transitions...
February 22, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28230438/the-influence-of-placements-on-adult-nursing-graduates-choice-of-first-post
#2
Mark Wareing, Renate Taylor, Aileen Wilson, Adrienne Sharples
BACKGROUND: This article presents findings from a study that sought to explore the extent to which clinical placements have an impact on nursing students' decisions regarding their first staff nurse post. Within the UK, nursing is facing a recruitment crisis with particular difficulty recruiting to areas such as primary care and care of older people. Transitioning into a new role is challenging in any occupation, but it is a particular problem in nursing where the realities of professional practice often differ from students' perception of the staff nurse role as shaped by their clinical placements...
February 23, 2017: British Journal of Nursing: BJN
https://www.readbyqxmd.com/read/28225034/simulating-future-value-in-intertemporal-choice
#3
Alec Solway, Terry Lohrenz, P Read Montague
The laboratory study of how humans and other animals trade-off value and time has a long and storied history, and is the subject of a vast literature. However, despite a long history of study, there is no agreed upon mechanistic explanation of how intertemporal choice preferences arise. Several theorists have recently proposed model-based reinforcement learning as a candidate framework. This framework describes a suite of algorithms by which a model of the environment, in the form of a state transition function and reward function, can be converted on-line into a decision...
February 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28214103/tracking-the-evolution-and-differences-between-guest-induced-phases-of-ga-mil-53-via-ultra-wideline-69-71-ga-solid-state-nmr-spectroscopy
#4
Yue Zhang, Bryan E G Lucier, Victor V Terskikh, Renlong Zheng, Yining Huang
Ga-MIL-53 is a metal-organic framework (MOF) that exhibits a "breathing effect," in which the pore size and overall MOF topology can be influenced by temperature, pressure, and host-guest interactions. The phase control afforded by this flexible framework renders Ga-MIL-53 a promising material for guest storage and sensing applications. In this work, the structure and behavior of four Ga-MIL-53 phases (as, ht, enp and lt), along with CO2 adsorbed within Ga-MIL-53 at various loading levels, has been investigated using (69/71)Ga solid-state NMR (SSNMR) experiments at 21...
January 31, 2017: Solid State Nuclear Magnetic Resonance
https://www.readbyqxmd.com/read/28210958/does-global-astrocytic-calcium-signaling-participate-in-awake-brain-state-transitions-and-neuronal-circuit-function
#5
Celia Kjaerby, Rune Rasmussen, Mie Andersen, Maiken Nedergaard
We continuously need to adapt to changing conditions within our surrounding environment, and our brain needs to quickly shift between resting and working activity states in order to allow appropriate behaviors. These global state shifts are intimately linked to the brain-wide release of the neuromodulators, noradrenaline and acetylcholine. Astrocytes have emerged as a new player participating in the regulation of brain activity, and have recently been implicated in brain state shifts. Astrocytes display global Ca(2+) signaling in response to activation of the noradrenergic system, but whether astrocytic Ca(2+) signaling is causative or correlative for shifts in brain state and neural activity patterns is not known...
February 16, 2017: Neurochemical Research
https://www.readbyqxmd.com/read/28208419/einstein-podolsky-rosen-paradox-implies-a-minimum-achievable-temperature
#6
David M Rogers
This work examines the thermodynamic consequences of the repeated partial projection model for coupling a quantum system to an arbitrary series of environments under feedback control. This paper provides observational definitions of heat and work that can be realized in current laboratory setups. In contrast to other definitions, it uses only properties of the environment and the measurement outcomes, avoiding references to the "measurement" of the central system's state in any basis. These definitions are consistent with the usual laws of thermodynamics at all temperatures, while never requiring complete projective measurement of the entire system...
January 2017: Physical Review. E
https://www.readbyqxmd.com/read/28196337/are-seaward-pneumatophore-fringes-transitional-between-mangrove-and-lower-shore-system-compartments
#7
R S K Barnes
Work in temperate New Zealand has concluded that seaward fringes of Avicennia pneumatophores (P) form an 'important ecological transitional environment' between seagrass (Z) and mangrove (M), supporting intermediate macrofaunal numbers and biodiversity (Alfaro, 2006). This study re-examined that hypothesis in subtropical Moreton Bay, Queensland, and investigated its dependence on the nature of the lower-shore habitat; i.e. whether seagrass or sandflat (S). Adjacent macrobenthic assemblages across 45 m deep Z:P:M and S:P:M interfaces were compared uni- and multivariately and via various assemblage metrics...
April 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28186825/balancing-safety-and-harm-for-older-adults-with-dementia-in-rural-emergency-departments-healthcare-professionals-perspectives
#8
Kathleen F Hunter, Belinda Parke, Maureen Babb, Dorothy Forbes, Laurel Strain
INTRODUCTION: The emergency department (ED) is a potentially harmful environment for older adults with dementia, and rural EDs face unique challenges in providing care to this population. The purpose of this study was to understand safety and harm in rural ED transitional care for community dwelling older adults with dementia from the perspective of healthcare professionals (HCPs). METHODS: An interpretive, descriptive exploratory design from a social ecological perspective was used...
January 2017: Rural and Remote Health
https://www.readbyqxmd.com/read/28176990/large-change-in-thermopower-with-temperature-driven-p-n-type-conduction-switching-in-environment-friendly-baxsr2-xti0-8fe0-8nb0-4o6-double-perovskites
#9
Pinku Roy, Vikram Waghmare, Khagesh Tanwar, Tanmoy Maiti
Oxide based thermoelectric materials have gained some interest in recent times due to their low thermal conductivity, environment friendly nature and high temperature durability. In the present work, the effect of Nb(5+) doping on the thermoelectric properties of BaxSr2-xTiFeO6 based double perovskites was investigated. BaxSr2-xTi0.8Fe0.8Nb0.4O6 (BSTFN) double perovskites with stoichiometric compositions of 0.0 ≤ x ≤ 0.25 were synthesized by the solid-state reaction method. Rietveld refinement powder XRD data confirmed single-phase solid solutions with cubic crystal symmetry for all the BSTFN compositions...
February 8, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28168745/the-adaptive-nature-of-protein-residue-networks
#10
Wael I Karain, Nael I Qaraeen
Protein residue networks PRNs are used to describe proteins. These networks are usually based on an average structure for the protein. However, proteins are dynamic entities that are affected by their surroundings. In this work, we study the effect of temperatures above and below the protein dynamical transition temperature(≈200K), on three important network parameters gleaned from weighted PRNs for the solvated β-Lactamase Inhibitory Protein BLIP: the betweenness centrality B, the closeness centrality C, and the clustering coefficient CC...
February 7, 2017: Proteins
https://www.readbyqxmd.com/read/28141523/the-plausibility-of-a-string-quartet-performance-in-virtual-reality
#11
Ilias Bergstrom, Sergio Azevedo, Panos Papiotis, Nuno Saldanha, Mel Slater
We describe an experiment that explores the contribution of auditory and other features to the illusion of plausibility in a virtual environment that depicts the performance of a string quartet. 'Plausibility' refers to the component of presence that is the illusion that the perceived events in the virtual environment are really happening. The features studied were: Gaze (the musicians ignored the participant, the musicians sometimes looked towards and followed the participant's movements), Sound Spatialization (Mono, Stereo, Spatial), Auralization (no sound reflections, reflections corresponding to a room larger than the one perceived, reflections that exactly matched the virtual room), and Environment (no sound from outside of the room, birdsong and wind corresponding to the outside scene)...
January 27, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28140707/preparing-for-practice-nursing-intern-and-faculty-perceptions-on-clinical-experiences
#12
Hanan AlThiga, Sharifah Mohidin, Yoon Soo Park, Ara Tekian
PURPOSE: Clinical experience and exposure to real patients are required elements of nursing education. Trainees in nursing are expected to be prepared adequately for the hard-working environment, increasing patient complexity, and higher-level competencies. This study investigates differences between nursing interns and clinical faculty on actual and perceived importance of educational preparation and development of clinical competencies, focusing on the nursing curriculum and transition to practice...
January 31, 2017: Medical Teacher
https://www.readbyqxmd.com/read/28139924/trends-in-homolytic-bond-dissociation-energies-of-five-and-six-coordinate-hydrides-of-group-9-transition-metals-co-rh-ir
#13
Vassiliki-Alexandra Glezakou, Roger Rousseau, Stephen T Elbert, James A Franz
The homolytic bond dissociation energies of a series of five- and six-coordinate mono- and dihydride complexes of the type HM(diphosphine)2 and [H2M(diphosphine)2](+) (where M = Co, Rh, and Ir) are calculated and compared with experimental values. This work probes the relationship between the homolytic bond dissociation energies (HMBDEs) of these complexes in these two different coordination environments and formal oxidation states. The results of these calculations and previous experimental observations suggest that for M = Rh the HMBDE of the five-coordinate HM(diphosphine)2 species are 0-2 kcal/mol larger than the HMBDE of the corresponding six-coordinate [H2M(diphosphine)2](+) species...
February 22, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28121762/transition-to-a-new-neonatal-intensive-care-unit-positive-effects-on-staff-working-environment-and-how-the-physical-environment-facilitates-family-centered-care
#14
Johannes van den Berg, Frida Bäck, Zara Hed, David Edvardsson
To optimize family-centered care and the staff working environment, the physical care environment should be designed to meet the needs of the infants, their families, and staff. It is important to evaluate the effects of a purpose-built neonatal ward on staff perceptions of job strain, the psychosocial climate, and the appropriateness of the physical environment. This study collected information from staff at a neonatal intensive care unit (NICU), before and after the ward was relocated to a new NICU. Effects were measured using the following variables: job strain, person-centered climate and appropriateness-of-the-physical-environment questionnaires...
January 2017: Journal of Perinatal & Neonatal Nursing
https://www.readbyqxmd.com/read/28120274/advanced-gi-surgery-training-a-roadmap-for-the-future-the-white-paper-from-the-ssat-task-force-on-advanced-gi-surgery-training
#15
Matthew M Hutter, Kevin E Behrns, Nathaniel J Soper, Fabrizio Michelassi
There is the need for well-trained advanced GI surgeons. The super specialization seen in academic and large community centers may not be applicable for surgeons practicing in other settings. The pendulum that has been swinging toward narrow specialization is swinging the other way, as many trained subspecialists are having a harder time finding positions after fellowship, and if they do find a position, the majority of their practice can actually be advanced GI surgery and not exclusively their area of focused expertise...
January 24, 2017: Journal of Gastrointestinal Surgery: Official Journal of the Society for Surgery of the Alimentary Tract
https://www.readbyqxmd.com/read/28119221/computer-simulations-on-the-ph-sensitive-tri-block-copolymer-containing-zwitterionic-sulfobetaine-as-a-novel-anti-cancer-drug-carrier
#16
Wenfeng Min, Daohui Zhao, Xuebo Quan, Delin Sun, Libo Li, Jian Zhou
In this work, dissipative particle dynamics (DPD) simulations were performed to study the self-assembled microstructures and doxorubicin (DOX) loading/release properties of pH-sensitive amphiphilic triblock copolymer: poly(ε-caprolactone)-b-poly(diethylaminoethyl methacrylate)-b-poly(sulfobetaine methacrylate) or poly (ethylene glycol methacrylate) (PCL-PDEA-PSBMA/PEGMA). Our results show that both copolymers can self-assemble into core-shell-corona micelles in aqueous environment. However, the corona structures are quite different for the two copolymer micelles...
January 19, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28114376/professional-s-perspectives-on-care-management-of-young-people-with-perinatally-acquired-hiv-during-transition-a-qualitative-study-in-adult-care-setting
#17
Enora Le Roux, Serge Gottot, Camille Aupiais, Thomas Girard, Maria Teixeira, Corinne Alberti
BACKGROUND: Increasing numbers of young people with perinatally acquired HIV are surviving to adulthood. When they come of age, they leave pediatric services in which they were followed and have to be transferred to the adult health care system. Difficulties in adaptation to adult care and the numbers of young people lost to follow up after transfer to adult care have been reported. This transition phase and their retention in adult care are crucial in maintaining the clinical status of these young with HIV in adulthood...
2017: PloS One
https://www.readbyqxmd.com/read/28106056/investigation-of-changes-in-structure-and-thermodynamic-of-spruce-budworm-antifreeze-protein-under-subfreezing-temperature
#18
Hung Nguyen, Ly Le
The aim of this theoretical work is to investigate of the changes in structure and thermodynamics of spruce budworm antifreeze protein (sbAFP) at low temperatures by using molecular dynamics simulation. The aqueous solution will form ice crystal network under the vaguely hexagonal shape at low temperature and fully represented the characteristics of hydrophobic interaction. Like ice crystal network, the cyclohexane region (including cyclohexane molecules) have enough of the characteristics of hydrophobic interaction...
January 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28103906/thermodynamic-and-kinetic-stability-of-the-josephin-domain-closed-arrangement-evidences-from-replica-exchange-molecular-dynamics
#19
Gianvito Grasso, Jack A Tuszynski, Umberto Morbiducci, Ginevra Licandro, Andrea Danani, Marco A Deriu
BACKGROUND: Molecular phenomena driving pathological aggregation in neurodegenerative diseases are not completely understood yet. Peculiar is the case of Spinocerebellar Ataxia 3 (SCA3) where the conformational properties of the AT-3 N-terminal region, also called Josephin Domain (JD), play a key role in the first step of aggregation, having the JD an amyloidogenic propensity itself. For this reason, unraveling the intimate relationship between JD structural features and aggregation tendency may lead to a step forward in understanding the pathology and rationally design a cure...
January 19, 2017: Biology Direct
https://www.readbyqxmd.com/read/28095400/computational-analysis-of-residue-interaction-networks-and-coevolutionary-relationships-in-the-hsp70-chaperones-a-community-hopping-model-of-allosteric-regulation-and-communication
#20
Gabrielle Stetz, Gennady M Verkhivker
Allosteric interactions in the Hsp70 proteins are linked with their regulatory mechanisms and cellular functions. Despite significant progress in structural and functional characterization of the Hsp70 proteins fundamental questions concerning modularity of the allosteric interaction networks and hierarchy of signaling pathways in the Hsp70 chaperones remained largely unexplored and poorly understood. In this work, we proposed an integrated computational strategy that combined atomistic and coarse-grained simulations with coevolutionary analysis and network modeling of the residue interactions...
January 2017: PLoS Computational Biology
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