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https://www.readbyqxmd.com/read/28936275/a-bio-inspired-method-for-direct-measurement-of-local-wall-shear-rates-with-micrometer-localization-using-the-multimeric-protein-von-willebrand-factor-as-sensor-molecule
#1
Klaus Bonazza, Bernhard Scheichl, Johannes Frank, Hanspeter Rottensteiner, Gerald Schrenk, Gernot Friedbacher, Peter L Turecek, Friedrich Scheiflinger, Günter Allmaier
Wall shear rates are critical for a broad variety of fluidic phenomena and are taken into account in nearly every experimental or simulation study. Generally, shear rates are not observable directly but rather derived from other parameters such as pressure and flow, often assuming somehow idealized systems. However, there is a biological system which is able to constantly measure the wall shear as a part of a regulatory circuit: The blood circulation system takes advantage of shear rate sensor (protein)molecules (multimeric forms of von Willebrand Factor, VWF), which are dissolved in the blood plasma and dramatically change their conformation under shear conditions...
July 2017: Biomicrofluidics
https://www.readbyqxmd.com/read/28924353/respiratory-muscle-strength-in-idiopathic-scoliosis-after-training-program
#2
Vera Lúcia Dos Santos Alves, Osmar Avanzi
OBJECTIVE: To analyze the impact of a physiotherapy protocol in maximum inspiratory and expiratory pressure in patients with adolescent idiopathic scoliosis (AIS) by manovacuometry. AIS may change the respiratory dynamics and the performance of inspiratory and expiratory muscles, affecting ventilatory capacity. METHODS: Patients with AIS aged 10 to 20 years old were randomly assigned to receive an aerobic exercise-training program or no treatment. They were evaluated for respiratory muscle strength before and after the treatment period by means of manovacuometry, thorax and spine radiographs...
November 2016: Acta Ortopedica Brasileira
https://www.readbyqxmd.com/read/28923578/coastal-dynamics-vs-beach-users-attitudes-and-perceptions-to-enhance-environmental-conservation-and-management-effectiveness
#3
Roberta Aretano, Luca Parlagreco, Teodoro Semeraro, Giovanni Zurlini, Irene Petrosillo
This work carries out a landscape analysis for the last 60years to compare the degree of preservation of two areas on the same Italian coastline characterized by different environmental protection levels: a National designated protected areas and a highly tourist coastal destination. The conversion of natural land-covers into human land uses were detected for protected and unprotected coastal stretches highlighting that the only establishment of a protected area is not enough to stem undesirable land-use outcomes...
September 15, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28922919/efficient-vibrational-energy-transfer-through-covalent-bond-in-indigo-carmine-revealed-by-nonlinear-ir-spectroscopy
#4
Xuemei He, Pengyun Yu, Juan Zhao, Jianping Wang
Ultrafast vibrational relaxation and structural dynamics of indigo carmine in dimethylsulfoxide were examined using femtosecond pump-probe infrared and two-dimensional infrared (2D IR) spectroscopies. Using the intramolecularly hydrogen-bonded C=O and delocalized C=C stretching modes as infrared probes, local structural and dynamical variations of this blue dye molecule were observed. Energy relaxation of vibrationally excited C=O stretching mode was found to occur through covalent bond to the delocalized aromatic vibrational modes on the time scale of a few picoseconds or less...
September 18, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28921975/intricacies-of-van-der-waals-interactions-in-systems-with-elongated-bonds-revealed-by-electron-groups-embedding-and-high-level-coupled-cluster-approaches
#5
Ewa Pastorczak, Jun Shen, Michal Hapka, Piotr Piecuch, Katarzyna Pernal
Non-covalent interactions between molecules with stretched intramonomer covalent bonds are a fascinating, yet little studied area. This shortage of information stems largely from the inability of most of the commonly used computational quantum chemistry methods to accurately describe weak long-range and strong non-dynamic correlations at the same time. In this work, we propose a geminal-based approach, abbreviated as EERPA-GVB, capable of describing such systems in a robust manner using relatively inexpensive computational steps...
September 18, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28921972/what-can-be-learned-from-nuclear-resonance-vibrational-spectroscopy-vibrational-dynamics-and-hemes
#6
W Robert Scheidt, Jianfeng Li, J Timothy Sage
Nuclear resonance vibrational spectroscopy (NRVS; also known as nuclear inelastic scattering, NIS) is a synchrotron-based method that reveals the full spectrum of vibrational dynamics for Mössbauer nuclei. Another major advantage, in addition to its completeness (no arbitrary optical selection rules), is the unique selectivity of NRVS. The basics of this recently developed technique are first introduced with descriptions of the experimental requirements and data analysis including the details of mode assignments...
September 18, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28919741/extracellular-biosynthesis-of-silver-nanoparticles-using-the-cell-free-filtrate-of-nematophagous-fungus-duddingtonia-flagrans
#7
Laryssa Pinheiro Costa Silva, Jairo Pinto Oliveira, Wanderson Juvencio Keijok, André Romero da Silva, Anderson Rocha Aguiar, Marco Cesar Cunegundes Guimarães, Carolina Magri Ferraz, Jackson Victor Araújo, Fernando Luiz Tobias, Fábio Ribeiro Braga
The biosynthesis of metallic nanoparticles (NPs) using biological systems such as fungi has evolved to become an important area of nanobiotechnology. Herein, we report for the first time the extracellular synthesis of highly stable silver NPs (AgNPs) using the nematophagous fungus Duddingtonia flagrans (AC001). The fungal cell-free filtrate was analyzed by the Bradford method and 3,5-dinitrosalicylic acid assay and used to synthesize the AgNPs in the presence of a 1 mM AgNO3 solution. They have been characterized by UV-Vis spectroscopy, X-ray diffraction, transmission electron microscopy, dynamic light scattering, Zeta potential measurements, Fourier-transform infrared, and Raman spectroscopes...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28919511/viscoelastic-properties-of-%C3%AE-keratin-fibers-in-hair
#8
Yang Yu, Wen Yang, Marc André Meyers
Considerable viscoelasticity and strain-rate sensitivity are a characteristic in α-keratin fibers, which can be considered a biopolymer. The understanding of viscoelasticity is an important part to the knowledge of the overall mechanical properties of these biological materials. Here, horse and human hairs are examined to analyze the sources of this response. The dynamic mechanical response of α-keratin fibers over a range of frequencies and temperatures is analyzed using a dynamic mechanical analyzer. The α-keratin fibers behave more elastically at higher frequencies while they become more viscous at higher temperatures...
September 14, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28917361/immediate-effects-of-pilates-based-therapeutic-exercise-on-postural-control-of-young-individuals-with-non-specific-low-back-pain-a-randomized-controlled-trial
#9
Susana Lopes, Christophe Correia, Gonçalo Félix, Mário Lopes, Ana Cruz, Fernando Ribeiro
OBJECTIVES: Low back pain affects the person's ability to keep balance, especially in challenging conditions. The purpose of this study was to determine the immediate effects of Pilates exercises on postural sway and dynamic balance of young individuals with non-specific low back pain. DESIGN: Controlled laboratory design. SETTINGS AND MAIN OUTCOME MEASURES: Forty-six participants with non-specific low back pain were randomized to a Pilates (n=23, 10 males; age: 21...
October 2017: Complementary Therapies in Medicine
https://www.readbyqxmd.com/read/28916583/a-balance-and-proprioception-intervention-programme-to-enhance-combat-performance-in-military-personnel
#10
Shany Funk, T Jacob, D Ben-Dov, E Yanovich, O Tirosh, N Steinberg
BACKGROUND: Optimal functioning of the lower extremities under repeated movements on unstable surfaces is essential for military effectiveness. Intervention training to promote proprioceptive ability should be considered in order to limit the risk for musculoskeletal injuries. The aim of this study was to assess the effect of a proprioceptive intervention programme on static and dynamic postural balance among Israel Defense Forces combat soldiers. METHODS: Twenty-seven male soldiers, aged 18-20 years, from a physical fitness instructor's course, were randomly divided into two groups matched by age and army unit...
September 14, 2017: Journal of the Royal Army Medical Corps
https://www.readbyqxmd.com/read/28915039/a-first-principles-molecular-dynamics-study-of-the-solvation-shell-structure-vibrational-spectra-polarity-and-dynamics-around-a-nitrate-ion-in-aqueous-solution
#11
Sushma Yadav, Ashu Choudhary, Amalendu Chandra
A first-principles molecular dynamics study is presented for the structural, dynamical, vibrational, and dipolar properties of the solvation shell of a nitrate ion in deuterated water. A detailed description of the anisotropic structure of the solvation shell is presented through calculations of various structural distributions in different conical shells around the perpendicular axis of the ion. The nitrate ion-water dimer potential energies are also calculated for many different orientations of water. The average vibrational stretch frequency of OD modes in the solvation shell is found to be higher than that of other OD modes in the bulk, which signifies a weakening of hydrogen bonds in the hydration shell...
September 15, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28913706/novel-pericatheter-retrograde-urethrogram-technique-is-a-viable-method-for-postoperative-urethroplasty-imaging
#12
Rachael D Sussman, F Cameron Hill, George E Koch, Versha Patel, Krishnan Venkatesan
PURPOSE: The purpose of this study is to describe our technique for pericatheter retrograde urethrogram (pcRUG) and to evaluate the utility of a pcRUG to detect a clinically significant leak after urethral reconstruction. METHODS: We retrospectively reviewed our prospective IRB-approved database of patients undergoing urethral reconstruction. pcRUG was performed at 3-4 weeks after surgery, in standardized fashion. Patients were placed in oblique position, and with the penis stretched, diluted contrast was instilled via an angiocatheter alongside the indwelling urethral catheter under dynamic fluoroscopy...
September 14, 2017: International Urology and Nephrology
https://www.readbyqxmd.com/read/28904945/effectiveness-of-the-thermal-treatments-used-for-curd-stretching-in-the-inactivation-of-shiga-toxin-producing-o157-and-o26-escherichia-coli
#13
M Trevisani, A Valero, R Mancusi
The kneading treatment of the fresh curd in hot water is a critical control point in the manufacturing of mozzarella. Factors such as the ratio between hot water and curd mass, the rheological properties, and the mixing and kneading activity affect the processing time and the internal temperature of the curd. The aim of this study was to investigate the effect of thermal treatments on the fate of Shiga toxin-producing Escherichia coli (STEC). Nine curd samples (weight 160-270 g) were artificially contaminated with O157 or O26 STEC and stretched in hot water (90-95°C) for 5-10 min...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28903010/effect-of-loading-on-in-vivo-tibiofemoral-and-patellofemoral-kinematics-of-healthy-and-acl-reconstructed-knees
#14
Jarred M Kaiser, Michael F Vignos, Richard Kijowski, Geoffrey Baer, Darryl G Thelen
BACKGROUND: Although knees that have undergone anterior cruciate ligament reconstruction (ACLR) often exhibit normal laxity on clinical examination, abnormal kinematic patterns have been observed when the joint is dynamically loaded during whole body activity. This study investigated whether abnormal knee kinematics arise with loading under isolated dynamic movements. HYPOTHESIS: Tibiofemoral and patellofemoral kinematics of ACLR knees will be similar to those of the contralateral uninjured control knee during passive flexion-extension, with bilateral differences emerging when an inertial load is applied...
September 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28902975/optical-and-optoelectronic-property-analysis-of-nanomaterials-inside-transmission-electron-microscope
#15
REVIEW
Joseph F S Fernando, Chao Zhang, Konstantin L Firestein, Dmitri Golberg
In situ transmission electron microscopy (TEM) allows one to investigate nanostructures at high spatial resolution in response to external stimuli, such as heat, electrical current, mechanical force and light. This review exclusively focuses on the optical, optoelectronic and photocatalytic studies inside TEM. With the development of TEMs and specialized TEM holders that include in situ illumination and light collection optics, it is possible to perform optical spectroscopies and diverse optoelectronic experiments inside TEM with simultaneous high resolution imaging of nanostructures...
September 13, 2017: Small
https://www.readbyqxmd.com/read/28900094/-protein-protein-interactions-of-huntingtin-in-the-hippocampus
#16
A L Proskura, S O Vechkapova, T A Zapara, A S Ratushniak
Huntingtin (HTT) occurs in the neuronal cytoplasm and can interact with structural elements of synapses. Huntington's disease (HD) results from pathological expansion of a polyglutamine stretch in the HTT molecule, being probably associated with aberrant protein-protein interactions. The pathogenetic mechanism is still incompletely understood. Alterations of the synaptic structure and plasticity in the hippocampus are observed in early HD. The objective of the study was to theoretically evaluate the HTT contribution to changes in synaptic plasticity by integrating the available experimental data...
July 2017: Molekuliarnaia Biologiia
https://www.readbyqxmd.com/read/28893285/estimates-of-individual-muscle-power-production-in-normal-adult-walking
#17
Ross A Bogey, Lee A Barnes
BACKGROUND: The purpose of this study was to determine the contribution of individual hip muscles to the net hip power in normal adult self-selected speed walking. A further goal was to examine each muscle's role in propulsion or support of the body during that task. METHODS: An EMG-to-force processing (EFP) model was developed which scaled muscle-tendon unit (MTU) force output to gait EMG. Active muscle power was defined as the product of MTU forces (derived from EFP) and that muscle's contraction velocity...
September 11, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/28892385/infrared-vacuum-ultraviolet-spectroscopic-and-theoretical-study-of-neutral-methylamine-dimer
#18
Bingbing Zhang, Xiangtao Kong, Shukang Jiang, Zhi Zhao, Dong Yang, Hua Xie, Ce Hao, Dongxu Dai, Xueming Yang, Zhifeng Liu, Ling Jiang
The methylamine dimer, (CH3NH2)2, is a model system to study the CH3 and NH2 spectral patterns in the neutral microsolvated systems relevant to chemical biology, atmospheric chemistry, and catalysis. We report infrared-vacuum ultraviolet (IR-VUV) spectroscopic measurements to probe the neutral (CH3NH2)2. Quantum chemical calculations and ab initio molecular dynamics simulations were carried out to understand the observed spectral features. Experimental and theoretical results indicate the likely coexistence of both cis and trans structures...
September 11, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28886650/a-general-variational-approach-for-computing-rovibrational-resonances-of-polyatomic-molecules-application-to-the-weakly-bound-h2he-and-h2%C3%A2-co-systems
#19
Dóra Papp, Tamás Szidarovszky, Attila G Császár
The quasi-variational quantum chemical protocol and code GENIUSH [E. Mátyus et al., J. Chem. Phys. 130, 134112 (2009) and C. Fábri et al., J. Chem. Phys. 134, 074105 (2011)] has been augmented with the complex absorbing potential (CAP) technique, yielding a method for the determination of rovibrational resonance states. Due to the effective implementation of the CAP technique within GENIUSH, the GENIUSH-CAP code is a powerful tool for the study of important dynamical features of arbitrary-sized molecular systems with arbitrary composition above their first dissociation limit...
September 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28886639/internal-energy-dependence-of-the-photodissociation-dynamics-of-o3-using-cryogenic-photoelectron-photofragment-coincidence-spectroscopy
#20
Ben B Shen, Yanice Benitez, Katharine G Lunny, Robert E Continetti
Photoelectron-photofragment coincidence (PPC) spectra of ozonide, O3(-), were measured at 388 nm (Ehν = 3.20 eV) using a newly constructed cryogenic octopole accumulation trap coupled to a PPC spectrometer. The photoelectron spectra reveal three processes consisting of a stable photodetachment channel, and two distinct photodissociation pathways yielding (1) O2 + O(-) or (2) O + O2(-). The first photodissociation pathway is observed in the PPC spectra by photodetachment of the O(-) product by a second photon, and produces electronically excited O2((1)Δg)...
September 7, 2017: Journal of Chemical Physics
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