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https://www.readbyqxmd.com/read/29314901/secondary-electrons-as-an-energy-source-for-life
#1
Kamil B Stelmach, Marc Neveu, Trista J Vick-Majors, Rebecca L Mickol, Luoth Chou, Kevin D Webster, Matt Tilley, Federica Zacchei, Cristina Escudero, Claudio L Flores Martinez, Amanda Labrado, Enrique J G Fernández
Life on Earth is found in a wide range of environments as long as the basic requirements of a liquid solvent, a nutrient source, and free energy are met. Previous hypotheses have speculated how extraterrestrial microbial life may function, among them that particle radiation might power living cells indirectly through radiolytic products. On Earth, so-called electrophilic organisms can harness electron flow from an extracellular cathode to build biomolecules. Here, we describe two hypothetical mechanisms, termed "direct electrophy" and "indirect electrophy" or "fluorosynthesis," by which organisms could harness extracellular free electrons to synthesize organic matter, thus expanding the ensemble of potential habitats in which extraterrestrial organisms might be found in the Solar System and beyond...
January 9, 2018: Astrobiology
https://www.readbyqxmd.com/read/29313270/ultrasound-elastography-based-assessment-of-the-elasticity-of-the-supraspinatus-muscle-in-impingement-syndrome-does-elastography-has-any-diagnostic-value
#2
Adnan Demirel, Murat Baykara, Tuba Tülay Koca, Ejder Berk
Ultrasound elastography (UE) is a new ultrasound-based imaging technique that provides information about elasticity and stiffness of tissues. This cross-sectional study aimed to identify the diagnostic importance of UE in supraspinatus impingement syndrome. Forty-one subjects, aged 38-70 years, were included in the study. UE was used to determine the elasticity of the supraspinatus muscle. The strain ratio was calculated as the evaluation criteria to measure the elasticity of the muscle. High strain ratio indicated low elasticity...
January 8, 2018: Clinical Rheumatology
https://www.readbyqxmd.com/read/29304957/editorial-commentary-it-s-the-fracture-not-the-fragment-that-causes-the-pain-posteromedial-elbow-impingement-in-baseball-players
#3
EDITORIAL
Shawn W O'Driscoll
Posterior impingement pain in baseball players is typically due to a fractured olecranon osteophyte. Computed tomographic (CT) scanning is the imaging of choice when evaluating posterior or posteromedial elbow pain in athletes who have subjected the elbow to excessive stresses such as occur in overhead throwing and weightlifting. Sometimes the fracture fragment can be so small that it might not be detected on plain radiographs, magnetic resonance imaging, or even at the time of arthroscopy. Symptomatic fractured olecranon osteophytes can be diagnosed clinically with the extension impingement test or arm bar test...
January 2018: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/29297724/effect-of-a-novel-mobilization-with-movement-procedure-on-anterolateral-ankle-impingement-a-case-report
#4
Sudarshan Anandkumar
This case report describes a 50-year-old male who presented with right anterolateral ankle pain managed unsuccessfully with rest, medications, bracing, injection, physical therapy, and massage therapy. Clinical diagnosis of anterolateral ankle impingement was based on concordant symptom reproduction with palpatory tenderness and a positive lateral synovial impingement test. This case report is a potential first time description of the successful management of anterolateral ankle impingement utilizing a novel Mulligan's mobilization with movement procedure (consisting of internal rotation of the distal tibia) and taping with immediate improvements noted in pain, range of motion, and function...
January 3, 2018: Physiotherapy Theory and Practice
https://www.readbyqxmd.com/read/29289617/the-anterior-ventrolateral-temporal-lobe-contributes-to-boosting-visual-working-memory-capacity-for-items-carrying-semantic-information
#5
Rocco Chiou, Matthew A Lambon Ralph
Working memory (WM) is a buffer that temporarily maintains information, be it visual or auditory, in an active state, caching its contents for online rehearsal or manipulation. How the brain enables long-term semantic knowledge to affect the WM buffer is a theoretically significant issue awaiting further investigation. In the present study, we capitalise on the knowledge about famous individuals as a 'test-case' to study how it impinges upon WM capacity for human faces and its neural substrate. Using continuous theta-burst transcranial stimulation combined with a psychophysical task probing WM storage for varying contents, we provide compelling evidence that (1) faces (regardless of familiarity) continued to accrue in the WM buffer with longer encoding time, whereas for meaningless stimuli (colour shades) there was little increment; (2) the rate of WM accrual was significantly more efficient for famous faces, compared to unknown faces; (3) the right anterior-ventrolateral temporal lobe (ATL) causally mediated this superior WM storage for famous faces...
December 28, 2017: NeuroImage
https://www.readbyqxmd.com/read/29282792/the-effect-of-working-in-an-infection-isolation-room-on-hospital-nurses-job-satisfaction
#6
Ilya Kagan, Shoshana Fridman, Esther Shalom, Semyon Melnikov
AIMS: To examine how the nature of working in a carbapenemase-producing Klebsiella pneumoniae infection isolation room affects nurses' job performance and job satisfaction. BACKGROUND: Job satisfaction is under intensive research as a factor in the retention of nursing staff. METHODS: In a cross-sectional design study, a convenience sample of 87 registered nurses who had worked in carbapenemase-producing Klebsiella pneumoniae isolation rooms in a tertiary medical centre in Israel answered a self-administered questionnaire...
December 28, 2017: Journal of Nursing Management
https://www.readbyqxmd.com/read/29276534/the-effect-of-humeral-polyethylene-insert-constraint-on-reverse-shoulder-arthroplasty-biomechanics
#7
Irfan Abdulla, Daniel G Langohr, Joshua W Giles, James A Johnson, George S Athwal
Background: There is little information on the effects of altering reverse shoulder arthroplasty (RSA) polyethylene constraint on joint load, load angle and deltoid force. The present biomechanical study aimed to investigate the effects of changing RSA polyethylene constraint on joint load, load angle, deltoid force and range of motion. Methods: A custom RSA implant capable of measuring forces across the joint with varying polyethylene constraint was tested in six cadaveric shoulders...
January 2018: Shoulder & Elbow
https://www.readbyqxmd.com/read/29245114/subacromial-impingement-syndrome-an-electromyographic-study-of-shoulder-girdle-muscle-fatigue
#8
Omid Alizadehkhaiyat, Margaret M Roebuck, Ahmed T Makki, Simon P Frostick
Muscle fatigue affecting glenohumeral and/or scapular muscles is suggested as one of the contributing factors to the development of subacromial impingement syndrome (SAIS). Nonetheless, the fatigability of shoulder girdle muscles in association with the pathomechanics of SAIS has not been reported. This study aimed to measure and compare fatigue progression within the shoulder girdle musculature of patients and healthy controls. 75 participants including 39 patients (20 females; 19 males) and 36 healthy controls (15 females; 21 males) participated in the study...
December 7, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/29234563/postural-alterations-in-patients-with-subacromial-impingement-syndrome
#9
Omid Alizadehkhaiyat, Margaret M Roebuck, Ahmed T Makki, Simon P Frostick
Background: An aberrant upper body posture has been proposed as one of the etiological factors contributing to the development of subacromial impingement syndrome (SAIS). Clinicians have translated this supposition into assessment and rehabilitation programs despite insufficient and conflicting evidence to support this approach. Purpose: The purpose of this study was to compare several postural variables between the SAIS patients and asymptomatic healthy controls...
December 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/29221991/on-the-production-of-chitosan-coated-pcl-nanoparticles-in-a-confined-impinging-jets-reactor
#10
Tereza Zelenková, Maria Julia Mora, Antonello A Barresi, Gladys Ester Granero, Davide Fissore
This work is focused on the synthesis of polycaprolactone nanoparticles, coated with chitosan, in a confined impinging jets reactor using the solvent displacement method. The role of the various reacting species was investigated, evidencing that a biocompatible polymer, e.g. polycaprolactone, is required to support chitosan to obtain a mono-modal particle size distribution, with low particle diameters. A surfactant is required to reduce nanoparticles size (down to a mean diameter of about 260 nm) and obtain a positive Zeta potential (about +31 mV), perfectly suitable for pharmaceutical applications...
December 5, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29218683/comparison-of-mri-ct-dunn-45%C3%A2-and-dunn-90%C3%A2-alpha-angle-measurements-in-femoroacetabular-impingement
#11
Kevin M Smith, Brayden J Gerrie, Patrick C McCulloch, David M Lintner, Joshua D Harris
PURPOSE: To determine if a significant difference existed among alpha angle measurements between 4 imaging techniques, axial oblique CT and MRI, Dunn 45° and Dunn 90° plain radiographs, in patients with symptomatic cam femoroacetabular impingement (FAI) and labral tear. METHODS: A single-surgeon prospective radiographic analysis of consecutive non-arthritic and non-dysplastic patients with symptomatic FAI and labral tears who underwent surgery was performed. Alpha angle was measured using standard techniques as described by Nötzli...
December 4, 2017: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/29216699/-diagnostic-value-of-a-predictive-model-for-complete-ruptures-of-the-rotator-cuff-associated-to-subacromial-impingement
#12
I R Águila-Ledesma, J L Córdova-Fonseca, O Medina-Pontaza, D A Núñez-Gómez, C Calvache-García, J M Pérez-Atanasio, R Torres-González
Pathology related to the rotator cuff remains among the most prevalent musculoskeletal diseases. There is an increasing need for imaging studies (MRI, US, arthroscopy) to test the diagnostic performance of the medical history and physical examination. OBJECTIVE: To prove the diagnostic value of a clinical-radiographic predictive model to find complete ruptures of the rotator cuff. MATERIAL AND METHODS: Descriptive, observational, prospective, transversal and analytical study...
May 2017: Acta Ortopédica Mexicana
https://www.readbyqxmd.com/read/29206465/testing-the-equivalence-between-spatial-averaging-and-temporal-averaging-in-highly-dilute-solutions
#13
Keith M Carroll, Colin Rawlings, Yadong Zhang, Armin W Knoll, Seth R Marder, Heiko Wolf, Urs Duerig
Diffusion relates the flux of particles to the local gradient of the particle density in a deterministic way. The question arises what happens when the particle density is so low that the local gradient becomes an ill-defined concept. The dilemma was resolved early last century by analyzing the average motion of particles subject to random forces whose magnitude is such that the particles are always in thermal equilibrium with their environment. The diffusion dynamics are now described in terms of a probability density of finding a particle at some position and time and a probabilistic flux density which is proportional to the gradient of the probability density...
December 5, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29206447/a-collection-method-for-isotopic-analysis-of-gaseous-nitrous-acid-hono
#14
Jiajue Chai, Meredith G Hastings
The sources and chemistry of gaseous nitrous acid (HONO) in the environment are of great interest. HONO is a major source of atmospheric hydroxyl radical (OH), which greatly impacts air quality and climate. HONO is also a major indoor pollutant that threatens human health. However, the large uncertainty of HONO sources and chemistry hinders an accurate prediction of the OH budget. Isotopic analysis of HONO may provide a tool for tracking the sources and chemistry of HONO. In this study, a modified annular denuder system (ADS) was developed to quantitatively capture HONO for offline nitrogen and oxygen isotopic analysis (δ15N and δ18O) using the denitrifier method...
December 5, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29200484/treatment-of-femoroacetabular-impingement-with-a-mini-open-direct-anterior-approach
#15
Paweł Skowronek, Marek Synder, Michał Polguj, Dariusz Marczak, Marcin Sibiński
Background: The opinion about best methods of femoroacetabular impingement (FAI) treatment are not consistent. Operative treatment of this condition may be arthroscopic, but open procedures with osteotomy of the greater trochanter and hip dislocation has been used. The present study evaluates the benefits of the mini-open direct anterior approach (DAA) in treating patients with FAI, with is a procedure available for most orthopedic surgeons. Materials and Methods: 39 patients treated for FAI (25 men and 14 women) at an average age of 29...
November 2017: Indian Journal of Orthopaedics
https://www.readbyqxmd.com/read/29195753/ultrasound-determination-of-the-femoral-head-neck-alpha-angle
#16
D J Robinson, S Lee, P Marks, M E Schneider
The femoral head-neck alpha angle is used to quantify the degree of femoral head asphericity in patients suspected of cam-type femoroacetabular impingement. The measurement was first performed using magnetic resonance imaging and, more recently, three-dimensional computed tomography (CT). We set out to determine whether the alpha angle could be reliably measured using ultrasound. Patients were recruited from a cohort presenting for CT of the hip. Alpha angles were calculated following the departmental protocol by institutionally accredited radiographers...
November 29, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29181261/functional-outcomes-of-hip-arthroscopy-in-an-active-duty-military-population-utilizing-a-criterion-based-early-weight-bearing-progression
#17
K Aaron Shaw, Jeremy M Jacobs, J Richard Evanson, Josh Pniewski, Michelle L Dickston, Terry Mueller, John A Bojescul
Introduction: Hip arthroscopy allows surgeons to address intra-articular pathology of the hip while avoiding more invasive open surgical dislocation. However the post-operative rehabilitation protocols have varied greatly in the literature, with many having prolonged periods of limited motion and weight bearing. Purpose: The purpose of this study was to describe a criterion-based early weight bearing protocol following hip arthroscopy and investigate functional outcomes in the subjects who were active duty military...
October 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/29171058/ultrasound-in-total-hip-replacement-value-of-anterior-acetabular-cup-visibility-and-contact-with-the-iliopsoas-tendon
#18
Raphaël Guillin, Valérie Bertaud, Marc Garetier, Olivier Fantino, Jean-Louis Polard, Jean-Christophe Lambotte
OBJECTIVES: To assess visibility of the acetabular cup in total hip replacement and to determine the value of direct and indirect signs of iliopsoas impingement syndrome with ultrasound. METHODS: Ultrasound examinations were performed by a single operator in 17 patients with iliopsoas impingement syndrome and 48 control patients. Cup visibility, contact between the cup and psoas tendon, and the presence of indirect signs of iliopsoas impingement syndrome were investigated in all patients...
November 24, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/29165587/identification-of-diverse-target-rnas-that-are-functionally-regulated-by-human-pumilio-proteins
#19
Jennifer A Bohn, Jamie L Van Etten, Trista L Schagat, Brittany M Bowman, Richard C McEachin, Peter L Freddolino, Aaron C Goldstrohm
Human Pumilio proteins, PUM1 and PUM2, are sequence specific RNA-binding proteins that regulate protein expression. We used RNA-seq, rigorous statistical testing and an experimentally derived fold change cut-off to identify nearly 1000 target RNAs-including mRNAs and non-coding RNAs-that are functionally regulated by PUMs. Bioinformatic analysis defined a PUM Response Element (PRE) that was significantly enriched in transcripts that increased in abundance and matches the PUM RNA-binding consensus. We created a computational model that incorporates PRE position and frequency within an RNA relative to the magnitude of regulation...
November 20, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/29158960/a-combined-treatment-approach-emphasizing-impairment-based-manual-therapy-and-exercise-for-hip-related-compensatory-injury-in-elite-athletes-a-case-series
#20
Steve Short, Gretchen Short, Donald Strack, Philip Anloague, Brian Brewster
Background/Purpose: Athletes experiencing hip, groin, and low back pain often exhibit similar clinical characteristics. Individuals with hip, groin and low back pain may have the presence of multiple concurrent pathoanatomical diagnoses. Regardless, similar regional characteristics and dysfunction may contribute to the patient's chief complaint, potentially creating a sub-group of individuals that may be defined by lumbopelvic and hip mobility limitations, motor control impairments, and other shared clinical findings...
November 2017: International Journal of Sports Physical Therapy
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