Read by QxMD icon Read


Roman M Lazarenko, Claire E DelBove, Qi Zhang
Release and recycling of synaptic vesicles are essential for neurotransmission and synaptic plasticity. To gain mechanistic understanding of these processes, direct measurements of vesicle release and retrieval is indispensable. Styryl dyes like FM1-43 and FM4-64 have been widely used for this purpose and their loading and unloading are reliable measurements for synaptic vesicle release and retrieval in cultured neurons. This protocol describes in detail the procedure of using styryl dyes to label and measure synaptic vesicle uptake and release in cultured rat hippocampal neurons...
January 20, 2018: Bio-protocol
Simone Frea, Paolo Centofanti, Stefano Pidello, Francesca Giordana, Virginia Bovolo, Andrea Baronetto, Beatrice Franco, Marco Matteo Cingolani, Matteo Attisani, Mara Morello, Serena Bergerone, Mauro Rinaldi, Fiorenzo Gaita
OBJECTIVES: The aim of this prospective study was to validate an echocardiographic protocol derived from 5 HeartWare left ventricular assist device (HVAD) patients for the noninvasive evaluation of right atrial pressure (RAP) and left atrial pressure (LAP) in HVAD patients. BACKGROUND: Echocardiography is an invaluable tool to optimize medical treatment and pump settings and also for troubleshooting residual heart failure. Little is known about the echocardiographic evaluation of hemodynamic status in HVAD patients...
March 9, 2018: JACC. Cardiovascular Imaging
Yuta Ogata, Masaya Anan, Makoto Takahashi, Takuya Takeda, Kenji Tanimoto, Tomonori Sawada, Koichi Shinkoda
OBJECTIVES: The purpose of this study was to investigate between movement patterns of trunk extension from full unloaded flexion and lifting techniques, which could provide valuable information to physical therapists, doctors of chiropractic, and other manual therapists. METHODS: A within-participant study design was used. Whole-body kinematic and kinetic data during lifting and full trunk flexion were collected from 16 healthy male participants using a 3-dimensional motion analysis system (Vicon Motion Systems)...
March 2018: Journal of Manipulative and Physiological Therapeutics
Josefine E Naili, Eva W Broström, Elena M Gutierrez-Farewik, Michael H Schwartz
This study aimed to evaluate whether the trajectory of the body's Centre of Mass (CoM) is a sensitive and responsive measure of functional compensations in individuals with knee osteoarthritis (OA) performing the Five Times Sit-to-Stand test (5STS). This prospective study included 21 individuals with OA and 21 age- and gender-matched controls. Motion analysis data was collected while participants performed the 5STS, one month prior and one year after total knee arthroplasty (TKA). Pain was evaluated using a visual analogue scale...
March 6, 2018: Gait & Posture
Julia Karmann, Benedikt Müller, Ulrich Z Hammes
Pathways for assimilates. During their life cycle, plants alternate between a haploid stage, the gametophyte, and a diploid stage, the sporophyte. In higher plants, meiosis generates the gametophyte deeply embedded in the maternal tissue of the flower. The megaspore mother cell undergoes meiosis, and then, the surviving megaspore of the four megaspores produced undergoes mitotic divisions and finally gives rise to the female gametophyte, consisting of the egg cell, two synergids, the central cell, which due to the fusion of two nuclei is diploid (double haploid) in Arabidopsis and most angiosperms and the antipods, whose number is not fixed and varies significantly between species (Yadegari and Drews in Plant Cell 16(Suppl):S133-S141, 2004)...
March 16, 2018: Plant Reproduction
Nicolas Algarra, Panagiotis G Karagiannopoulos, Arnaud Lazarus, Damien Vandembroucq, Evelyne Kolb
We study the quasistatic penetration of a flexible beam into a two-dimensional dense granular medium lying on a horizontal plate. Rather than a buckling-like behavior we observe a transition between a regime of crack-like penetration in which the fiber only shows small fluctuations around a stable straight geometry and a bending regime in which the fiber fully bends and advances through series of loading and unloading steps. We show that the shape reconfiguration of the fiber is controlled by a single nondimensional parameter L/L_{c}, which is the ratio of the length of the flexible beam L to L_{c}, a bending elastogranular length scale that depends on the rigidity of the fiber and on the departure from the jamming packing fraction of the granular medium...
February 2018: Physical Review. E
Fabien Cignetti, Marianne Vaugoyeau, Aurelie Fontan, Marianne Jover, Marie-Odile Livet, Catherine Hugonenq, Frédérique Audic, Brigitte Chabrol, Christine Assaiante
BACKGROUND AND AIM: Feedforward and online controls are two facets of predictive motor control from internal models, which is suspected to be impaired in learning disorders. We examined whether the feedforward component is affected in children (8-12 years) with developmental dyslexia (DD) and/or with developmental coordination disorder (DCD) compared to typically developing (TD) children. METHODS: Children underwent a bimanual unloading paradigm during which a load supported to one arm, the postural arm, was either unexpectedly unloaded by a computer or voluntary unloaded by the subject with the other arm...
March 13, 2018: Research in Developmental Disabilities
P Alex Smith, Yaxin Wang, Ralph W Metcalfe, Luiz C Sampaio, Daniel L Timms, William E Cohn, O H Frazier
PURPOSE: A minimally invasive, partial-assist, intra-atrial blood pump has been proposed, which would unload the left ventricle with a flow path from the left atrium to the arterial system. Flow modulation is a common strategy for ensuring washout in the pump, but it can increase power consumption because it is typically achieved through motor-speed variation. However, if a pump's performance curve had the proper gradient, flow modulation could be realized passively. To achieve this goal, we propose a pump performance operating curve as an alternative to the more standard operating point...
March 2018: International Journal of Artificial Organs
Eloisa Basile, Giulio Russo, Antonio M Leone
It is essential to understand the pathophysiology of cardiogenic shock and the possible deterioration of contractile function during high-risk PCI in order to select those patients who could benefit from mechanical support thus choosing the most suitable device in every situation. Percutaneous Ventricular Assist Devices (pVAD) provide hemodynamic support by improving cardiac output and mean arterial pressure, but their specific features result in different hemodynamic effects and degrees of myocardial ischemic protection and LV unloading...
March 15, 2018: Minerva Cardioangiologica
Sven Persoon, Michael Paulus, Stephan Hirt, Carsten Jungbauer, Alexander Dietl, Andreas Luchner, Christof Schmid, Lars S Maier, Christoph Birner
Implantation of left ventricular assist devices (LVADs) as bridge to transplant in end-stage heart failure allows for analyzing reverse remodeling processes of the supported heart. Whether this therapy influences the cGMP-PKG signaling pathway, which is currently under thorough investigation for developing new heart failure therapeutics, is unknown. In fourteen end-stage heart failure patients (8 with dilated cardiomyopathy, DCM; 6 with ischemic cardiomyopathy, ICM) tissue specimens of left ventricles were collected at LVAD implantation and afterwards at receiver heart explantation, respectively...
March 15, 2018: Heart and Vessels
Julio Sandoval
Despite advances in drug therapy, pulmonary hypertension-particularly arterial hypertension (PAH)-remains a fatal disease. Untreatable right heart failure (RHF) from PAH eventually ensues and remains a significant cause of death in these patients. Lowering pulmonary input impedance with different PAH-specific drugs is the obvious therapeutic target in RHF due to chronically increased afterload. However, potential clinical gain can also be expected from attempts to unload the right heart and increase systemic output...
March 12, 2018: Revista Española de Cardiología
Christopher J Lambert, Briana C Freshner, Arlen Chung, Tamara J Stevenson, D Miranda Bowles, Raheel Samuel, Bruce K Gale, Joshua L Bonkowsky
Zebrafish are a valuable model organism in biomedical research. Their rapid development, ability to model human diseases, utility for testing genetic variants identified from next-generation sequencing, amenity to CRISPR mutagenesis, and potential for therapeutic compound screening, has led to their wide-spread adoption in diverse fields of study. However, their power for large-scale screens is limited by the absence of automated genotyping tools for live animals. This constrains potential drug screen options, limits analysis of embryonic and larval phenotypes, and requires raising additional animals to adulthood to ensure obtaining an animal of the desired genotype...
2018: PloS One
Christopher McCrum, Pamela Leow, Gaspar Epro, Matthias König, Kenneth Meijer, Kiros Karamanidis
Tendons transfer forces produced by muscle to the skeletal system and can therefore have a large influence on movement effectiveness and safety. Tendons are mechanosensitive, meaning that they adapt their material, morphological and hence their mechanical properties in response to mechanical loading. Therefore, unloading due to immobilization or inactivity could lead to changes in tendon mechanical properties. Additionally, ageing may influence tendon biomechanical properties directly, as a result of biological changes in the tendon, and indirectly, due to reduced muscle strength and physical activity...
2018: Frontiers in Physiology
Mohammad Nauzef Mahmood, Laura H C Peeters, Micha Paalman, Gijsbertus J Verkerke, Idsart Kingma, Jaap H van Dieën
BACKGROUND: Patients with Duchenne muscular dystrophy gradually lose the ability to use different muscles of their body. Consequently, they lose the ability to stabilize their trunk against gravity. This hinders them to effectively perform different daily activities. In this paper, we describe the design, realization and evaluation of a trunk orthosis for these patients that should allow them to move their trunk and maintain stability. METHOD: This study aimed to primarily assess the effectiveness of the trunk support system in terms of unloading of trunk muscles, so only healthy participants were recruited for this phase of the study...
March 14, 2018: Journal of Neuroengineering and Rehabilitation
Mayron F Oliveira, Rita C Santos, Suellen A Artz, Vanessa M F Mendez, Denise M L Lobo, Edileide B Correia, Almir S Ferraz, Iracema I K Umeda, Priscila A Sperandio
BACKGROUND: Exercise training (ET) improves functional capacity in chronic heart failure (HF). However, ET effects in acute HF are unknown. OBJECTIVE: To investigate the effects of ET alone or combined with noninvasive ventilation (NIV) compared with standard medical treatment during hospitalization in acute HF patients. METHODS: Twenty-nine patients (systolic HF) were randomized into three groups: control (Control - only standard medical treatment); ET with placebo NIV (ET+Sham) and ET+NIV (NIV with 14 and 8 cmH2O of inspiratory and expiratory pressure, respectively)...
March 12, 2018: Arquivos Brasileiros de Cardiologia
David M Tehrani, Daniel Rodgers, Sirtaz Adatya, Nitasha Sarswat, Jayant Raikhelkar, Gene H Kim, Gabriel Sayer, Nir Uriel
We aim to evaluate the echocardiographic/hemodynamic effects of left ventricular assist devices in African American (AA) versus non-AA patients undergoing ramp speed optimization and its subsequent effect on readmissions. In 65 patients (26 AA), no differences in baseline echocardiographic/hemodynamic parameters were noted. During ramp testing, there was a significantly greater increase in cardiac output (slope: 0.29 ± 0.24 vs. 0.15 ± 0.12, p < 0.01) with more rapid decrease in left ventricular end-diastolic diameter (slope: -0...
March 13, 2018: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
Mohammad Kia, Timothy M Wright, Michael B Cross, David J Mayman, Andrew D Pearle, Peter K Sculco, Geoffrey H Westrich, Carl W Imhauser
BACKGROUND: The correct amount of external rotation of the femoral component during TKA is controversial because the resulting changes in biomechanical knee function associated with varying degrees of femoral component rotation are not well understood. We addressed this question using a computational model, which allowed us to isolate the biomechanical impact of geometric factors including bony shapes, location of ligament insertions, and implant size across three different knees after posterior-stabilized (PS) TKA...
January 2018: Clinical Orthopaedics and related Research
Krishnendu Haldar, Chinmoy Pal
This study aims constitutive modeling of rate dependent anisotropic viscoelastic brain tissue that experiences large deformation during accidental impact. Many experimental studies confirm that brain parenchyma mechanisms are strongly influenced by anisotropy, nonlinear viscoelasticity, rate dependent loading/unloading and tension-compression asymmetry of the soft brain tissues. We present a rigorous thermodynamically consistent phenomenological approach to capture these mechanisms in a single model. Model parameters are calibrated from the experiments, and mechanical responses are predicted for different loading conditions...
December 24, 2017: Journal of the Mechanical Behavior of Biomedical Materials
Victoria Flores, James Becker, Eric Burkhardt, Joshua Cotter
The back squat exercise is typically practiced with varying squat depths and barbell loads. However, depth has been inconsistently defined, resulting in unclear safety precautions when squatting with loads. Additionally, females exhibit anatomical and kinematic differences to males which may predispose them to knee joint injuries. The purpose of this study was to characterize peak knee extensor moments (pKEMs) at three commonly practiced squat depths of above parallel, parallel, and full depth, and with three loads of 0% (unloaded), 50%, and 85% depth-specific one repetition maximum (1RM) in recreationally active females...
March 6, 2018: Journal of Strength and Conditioning Research
Irina Kramerova, Jorge A Torres, Ascia Eskin, Stanley F Nelson, Melissa J Spencer
Mutations in CAPN3 cause autosomal recessive limb girdle muscular dystrophy 2A. Calpain 3 (CAPN3) is a calcium dependent protease residing in the myofibrillar, cytosolic and triad fractions of skeletal muscle. At the triad, it colocalizes with calcium calmodulin kinase IIβ (CaMKIIβ). CAPN3 knock out mice (C3KO) show reduced triad integrity and blunted CaMKIIβ signaling, which correlates with impaired transcriptional activation of myofibrillar and oxidative metabolism genes in response to running exercise...
March 8, 2018: Human Molecular Genetics
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"