keyword
MENU ▼
Read by QxMD icon Read
search

Mechanical force

keyword
https://www.readbyqxmd.com/read/28107706/beneficial-effect-of-cu-on-ti-nb-ta-zr-sputtered-uniform-adhesive-gum-films-accelerating-bacterial-inactivation-under-indoor-visible-light
#1
Akram Alhussein, Sofiane Achache, Regis Deturche, Frederic Sanchette, Cesar Pulgarin, John Kiwi, Sami Rtimi
This article presents the evidence for the significant effect of copper accelerating the bacterial inactivation on Ti-Nb-Ta-Zr (TNTZ) sputtered films on glass up to a Cu content of 8.3 at.%. These films were deposited by dc magnetron co-sputtering of an alloy target Ti-23Nb-0.7Ta-2Zr (at.%) and a Cu target. The fastest bacterial inactivation of E. coli on this later TNTZ-Cu surface proceeded within ∼75min. The films deposited by magnetron sputtering are chemically homogenous. The film roughness evaluated by atomic force spectroscopy (AFM) on the TNTZ-Cu 8...
January 15, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28107626/polymeric-nanofibers-with-ultrahigh-piezoelectricity-via-self-orientation-of-nanocrystals
#2
Xia Liu, Jing Ma, Xiaoming Wu, Liwei Lin, Xiaohong Wang
Piezoelectricity in macromolecule polymers has been gaining immense attention, particularly for applications in biocompatible, implantable, and flexible electronic devices. This paper introduces core-shell-structured piezoelectric polyvinylidene fluoride (PVDF) nanofibers chemically wrapped by graphene oxide (GO) lamellae (PVDF/GO nanofibers), in which the polar β-phase nanocrystals are formed and uniaxially self-oriented by the synergistic effect of mechanical stretching, high-voltage alignment, and chemical interactions...
January 20, 2017: ACS Nano
https://www.readbyqxmd.com/read/28107113/the-relationship-between-pitching-mechanics-and-injury
#3
Peter N Chalmers, Markus A Wimmer, Nikhil N Verma, Brian J Cole, Anthony A Romeo, Gregory L Cvetanovich, Michael L Pearl
CONTEXT: The overhand pitch is one of the fastest known human motions and places enormous forces and torques on the upper extremity. Shoulder and elbow pain and injury are common in high-level pitchers. A large body of research has been conducted to understand the pitching motion. EVIDENCE ACQUISITION: A comprehensive review of the literature was performed to gain a full understanding of all currently available biomechanical and clinical evidence surrounding pitching motion analysis...
January 1, 2017: Sports Health
https://www.readbyqxmd.com/read/28107059/age-dependent-modulation-of-songbird-summer-feather-molt-by-temporal-and-functional-constraints
#4
Yosef Kiat, Nir Sapir
Time constraints influence various ecological, life-history, and demographic properties of individuals and populations of many species throughout the annual cycle. Feather molt is a timely undertaking that is considered among the three most energy-demanding processes in the life cycle of birds. To deal with time pressure, passerines may shorten their molt duration, using three non-mutually exclusive mechanisms: (1) replacing only part of the plumage, (2) increasing the speed of molt, and (3) postponing the renewal of some or all the plumage to a later season (i...
February 2017: American Naturalist
https://www.readbyqxmd.com/read/28106505/pulp-vascularization-during-tooth-development-regeneration-and-therapy
#5
C Rombouts, T Giraud, C Jeanneau, I About
The pulp is a highly vascularized tissue situated in an inextensible environment surrounded by rigid dentin walls, with the apical foramina being the only access. The pulp vascular system is not only responsible for nutrient supply and waste removal but also contributes actively to the pulp inflammatory response and subsequent regeneration. This review discusses the underlying mechanisms of pulp vascularization during tooth development, regeneration, and therapeutic procedures, such as tissue engineering and tooth transplantation...
February 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28106405/self-force-corrections-to-the-periapsis-advance-around-a-spinning-black-hole
#6
Maarten van de Meent
The linear in mass ratio correction to the periapsis advance of equatorial nearly circular orbits around a spinning black hole is calculated for the first time and to a very high precision, providing a key benchmark for different approaches modeling spinning binaries. The high precision of the calculation is leveraged to discriminate between two recent incompatible derivations of the 4 post-Newtonian equations of motion. Finally, the limit of the periapsis advance near the innermost stable orbit (ISCO) allows the determination of the ISCO shift, validating previous calculations using the first law of binary mechanics...
January 6, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28106367/alignment-of-carbon-nanotubes-in-carbon-nanotube-fibers-through-nanoparticles-a-route-for-controlling-mechanical-and-electrical-properties
#7
Muhammad Mohsin Hossain, Md Akherul Islam, Hossain Shima, Mudassir Hasan, Moonyong Lee
This is the first study that describes how semiconducting ZnO can act as an alignment agent in carbon nanotubes (CNTs) fibers. Due to the alignment of CNTs through the ZnO nanoparticles linking groups, the CNTs inside the fibers were equally distributed by the attraction of bonding forces into sheet-like bunches, such that any applied mechanical breaking load was equally distributed to each CNT inside the fiber, making them mechanically robust against breaking loads. Although semiconductive ZnO nanoparticles were used here, the electrical conductivity of the aligned CNT fiber was comparable to bare CNT fibers, suggesting that the total electron movement through the CNTs inside the aligned CNT fiber is not disrupted by the insulating behavior of ZnO nanoparticles...
January 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28106222/digestibility-and-supramolecular-structural-changes-of-maize-starch-by-non-covalent-interactions-with-gallic-acid
#8
Chengdeng Chi, Xiaoxi Li, Yiping Zhang, Ling Chen, Lin Li, Zhijiang Wang
The effects of non-covalent interactions between gallic acid (GA) and starch on starch digestibility and supramolecular structural changes (short-range ordered molecular structure, crystalline structure, lamellar structure and fractal structure) were investigated. The results indicated that the digestibility of both starches was substantially reduced in the rapidly digestible starch (RDS) content, but resistant starch (RS) was increased after interacting with GA. The RS content of starch-GA complexes ranged from 17...
January 20, 2017: Food & Function
https://www.readbyqxmd.com/read/28106209/sub-100-nm-wrinkling-of-polydimethylsiloxane-by-double-frontal-oxidation
#9
Manuela Nania, Fabrizia Foglia, Omar K Matar, João T Cabral
We demonstrate nanoscale wrinkling on polydimethylsiloxane (PDMS) at sub-100 nm length scales via a (double) frontal surface oxidation coupled with a mechanical compression. The kinetics of the glassy skin propagation is resolved by neutron and X-ray reflectivity, and atomic force microscopy, combined with mechanical wrinkling experiments to evaluate the resulting pattern formation. In conventional PDMS surface oxidation, the smallest wrinkling patterns attainable have an intrinsic lower wavelength limit due to the coupling of skin formation and front propagation at fixed strain εprestrain, whose maximum is, in turn, set by material failure...
January 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28105954/the-amp-foot-3-new-generation-propulsive-prosthetic-feet-with-explosive-motion-characteristics-design-and-validation
#10
Pierre Cherelle, Victor Grosu, Manuel Cestari, Bram Vanderborght, Dirk Lefeber
The last decades, rehabilitation has become a challenging context for mechatronical engineering. From the state-of-the-art it is seen that the field of prosthetics offers very promising perspectives to roboticist. Today's prosthetic feet tend to improve amputee walking experience by delivering the necessary push-off forces while walking. Therefore, several new types of (compliant) actuators are developed in order to fulfill the torque and power requirements of a sound ankle-foot complex with minimized power consumption...
December 19, 2016: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28105948/active-lower-limb-prosthetics-a-systematic-review-of-design-issues-and-solutions
#11
REVIEW
Michael Windrich, Martin Grimmer, Oliver Christ, Stephan Rinderknecht, Philipp Beckerle
This paper presents a review on design issues and solutions found in active lower limb prostheses. This review is based on a systematic literature search with a methodical search strategy. The search was carried out across four major technical databases and the retrieved records were screened for their relevance. A total of 21 different active prostheses, including 8 above-knee, 9 below-knee and 4 combined knee-ankle prostheses were identified. While an active prosthesis may help to restore the functional performance of an amputee, the requirements regarding the actuation unit as well as for the control system are high and the development becomes a challenging task...
December 19, 2016: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28105891/friction-of-sodium-alginate-hydrogel-scaffold-fabricated-by-3-d-printing
#12
Qian Yang, Jian Li, Heng Xu, Shijun Long, Xuefeng Li
A rapid prototyping technology, formed by three-dimensional (3-D) printing and then crosslinked by spraying Ca(2+) solution, is developed to fabricate a sodium alginate (SA) hydrogel scaffold. The porosity, swelling ratio, and compression modulus of the scaffold are investigated. A friction mechanism is developed by studying the reproducible friction behavior. Our results show that the scaffold can have 3-D structure with a porosity of 52%. The degree of swelling of the SA hydrogel scaffold is 8.5, which is nearly the same as bulk SA hydrogel...
January 20, 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/28105702/hydrodynamic-effects-in-soft-matter-self-assembly-the-case-of-j-aggregates-of-amphiphilic-porphyrins
#13
REVIEW
Josep M Ribo, Zoubir El-Hachemi, Oriol Arteaga, Adolf Canillas, Joaquim Crusats
Chiral J-aggregates of achiral amphiphilic porphyrins (4-sulfonatophenyl and aryl meso-substituted porphyrins) show several effects under the hydrodynamic forces of common stirring. These effects can be classified as pure mechanic (e. g. elasticity, plasticity and breaking of the self-assembly non-covalent bonding) and chemically selective as detected in the formation/growth of the nanoparticles. Diastereoselective, enantioselective and, depending on the sign of chiral shear forces, even enantiospecific selections have been described...
January 20, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28104924/the-adaptive-nature-of-culture-a-cross-cultural-analysis-of-the-returns-of-local-environmental-knowledge-in-three-indigenous-societies
#14
Victoria Reyes-García, Maximilien Guèze, Isabel Díaz-Reviriego, Romain Duda, Álvaro Fernández-Llamazares, Sandrine Gallois, Lucentezza Napitupulu, Martí Orta-Martínez, Aili Pyhälä
Researchers have argued that the behavioral adaptations that explain the success of our species are partially cultural, i.e., cumulative and socially transmitted. Thus, understanding the adaptive nature of culture is crucial to understand human evolution. We use a cross-cultural framework and empirical data purposely collected to test whether culturally transmitted and individually appropriated knowledge provides individual returns in terms of hunting yields and health and, by extension, to nutritional status, a proxy for individual adaptive success...
December 2016: Current Anthropology
https://www.readbyqxmd.com/read/28104788/myo18b-is-essential-for-sarcomere-assembly-in-fast-skeletal-muscle
#15
Joachim Berger, Silke Berger, Mei Li, Peter D Currie
Congenital myopathies are muscle degenerative disorders with a broad clinical spectrum. A number of myopathies have been associated with molecular defects within sarcomeres, the force-generating component of the muscle cell. Whereas the highly regular organization of the myofibril has been studied in detail, in vivo assembly of sarcomeres remains a poorly understood process. Therefore, a more detailed knowledge of sarcomere assembly is crucial to better understand the pathogenic mechanisms within myopathies...
January 18, 2017: Human Molecular Genetics
https://www.readbyqxmd.com/read/28104604/hiv-infection-model-of-chronic-obstructive-pulmonary-disease-in-mice
#16
Patrick Geraghty, Eran Hadas, Boe-Hyun Kim, Abdoulaye J Dabo, David J Volsky, Robert Foronjy
Cigarette smoke usage is prevalent in HIV+ patients and, despite highly active antiretroviral therapy (HAART), these individuals develop an accelerated form of chronic obstructive pulmonary disease (COPD). Studies investigating the mechanisms of COPD development in HIV have been limited by the lack of suitable mouse models. Here we describe a model of HIV induced COPD in wild type mice using EcoHIV, a chimeric HIV capable of establishing chronic infection in immunocompetent mice. A/J mice were infected with EcoHIV and subjected to whole body cigarette smoke exposure...
January 19, 2017: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/28104532/sphingolipids-and-glycerophospholipids-the-ying-and-yang-of-lipotoxicity-in-metabolic-diseases
#17
REVIEW
S Rodriguez-Cuenca, V Pellegrinelli, M Campbell, M Oresic, A Vidal-Puig
Sphingolipids in general and ceramides in particular, contribute to pathophysiological mechanisms by modifying signalling and metabolic pathways. Here, we present the available evidence for a bidirectional homeostatic crosstalk between sphingolipids and glycerophospholipids, whose dysregulation contributes to lipotoxicity induced metabolic stress. The initial evidence for this crosstalk originates from simulated models designed to investigate the biophysical properties of sphingolipids in plasma membrane representations...
January 16, 2017: Progress in Lipid Research
https://www.readbyqxmd.com/read/28104498/laparoscopic-myomectomy-a-single-centre-retrospective-review-of-514-patients
#18
Elisabeth Mary Ruth Bean, Alfred Cutner, Tom Holland, Arvind Vashisht, Davor Jurkovic, Ertan Saridogan
STUDY OBJECTIVE: To review surgical outcomes and histopathological findings following laparoscopic myomectomy by a team at a university teaching hospital. DESIGN: This was a retrospective review of consecutive cases of laparoscopic myomectomy carried out by members of our minimal access surgery team between January 2004 and December 2015. DESIGN CLASSIFICATION: Canadian Task Force Classification II-3 SETTING: University Teaching Hospital PATIENTS: Women undergoing laparoscopic myomectomy INTERVENTIONS: Laparoscopic myomectomy MEASUREMENTS AND MAIN RESULTS: We collected women's demographic data, clinical histories and surgical outcomes, including complication rates and the incidence of undiagnosed uterine malignancy...
January 16, 2017: Journal of Minimally Invasive Gynecology
https://www.readbyqxmd.com/read/28104368/interaction-of-capsaicin-with-calf-thymus-dna-a-multi-spectroscopic-and-molecular-modelling-study
#19
Faizan Abul Qais, K M Abdullah, Md Maroof Alam, Imrana Naseem, Iqbal Ahmad
Studying the mode of interaction between small molecules and DNA have received much attention in recent years, as many drugs have been reported to directly interact with DNA thereby regulating the expression of many genes. Capsaicin is a capsaiciniods family phytocompound having many therapeutic applications including diabetic neuropathy, rheumatoid arthritis, prevention of DNA strand breaks and chromosomal aberrations. In this study, we have investigated the interaction of capsaicin with calf thymus DNA using a number of biophysical techniques to get an insight and better understanding of the interaction mechanism...
January 16, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28104302/stat5-drives-abnormal-proliferation-in-autosomal-dominant-polycystic-kidney-disease
#20
Maria Fragiadaki, Morgane Lannoy, Madeleine Themanns, Barbara Maurer, Wouter N Leonhard, Dorien J M Peters, Richard Moriggl, Albert C M Ong
Autosomal dominant polycystic kidney disease (ADPKD) leads to renal failure. The hallmark of ADPKD is increased epithelial proliferation, which has been proposed to be due to atypical signaling including abnormal JAK-STAT activity. However, the relative contribution of JAK-STAT family members in promoting proliferation in ADPKD is unknown. Here, we present siRNA JAK-STAT-focused screens discovering a previously unknown proliferative role for multiple JAK-STAT components (including STAT1, STAT2, STAT4, STAT5a, and STAT5b)...
January 16, 2017: Kidney International
keyword
keyword
33364
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"