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https://www.readbyqxmd.com/read/28640740/differential-effects-of-isc-operon-mutations-on-the-biosynthesis-and-activity-of-key-anaerobic-metalloenzymes-in-escherichia-coli
#1
Monique Jaroschinsky, Constanze Pinske, R Gary Sawers
Escherichia coli has two machineries for the synthesis of FeS clusters, namely Isc (iron-sulfur cluster) and Suf (sulfur formation). The Isc machinery, encoded by the iscRSUA-hscBA-fdx-iscXoperon, plays a crucial role in the biogenesis of FeS clusters for the oxidoreductases of aerobic metabolism. Less is known, however, about the role of ISC in the maturation of key multi-subunit metalloenzymes of anaerobic metabolism. Here, we determined the contribution of each iscoperon gene product towards the functionality of the major anaerobic oxidoreductases in E...
June 22, 2017: Microbiology
https://www.readbyqxmd.com/read/28640310/spectroscopic-evidence-for-cofactor-substrate-interaction-in-the-radical-sam-enzyme-tyw1
#2
Velavan Kathirvelu, Phanélie Perche-Letuvée, Jean-Marc Latour, Mohamed Atta, Farhad Forouhar, Serge Gambarelli, Ricardo Garcia-Serres
TYW1 is a metalloenzyme involved in the modifications of guanosine 37 of Phe-tRNA of Eukaryota and Archaea. It catalyzes the second step of Wybutosine biosynthesis, which consists of the formation of the tricyclic compound imG-14 from m(1)G using pyruvate and SAM (S-adenosyl-methionine) as co-substrates. Two [4Fe-4S] clusters are needed in the catalytic process. One effects the reductive binding of SAM, which initiates the radical reaction that inserts a C-C moiety into m(1)G. The other [4Fe-4S] cluster binds the pyruvate molecule that provides the C-C motif...
June 22, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28640119/relationships-between-dorsolateral-prefrontal-cortex-metabolic-change-and-cognitive-impairment-in-first-episode-neuroleptic-naive-schizophrenia-patients
#3
Man-Li Huang, Thong-Teck Khoh, Shao-Jia Lu, Fen Pan, Jin-Kai Chen, Jian-Bo Hu, Shao-Hua Hu, Wei-Juan Xu, Wei-Hua Zhou, Ning Wei, Hong-Li Qi, De-Sheng Shang, Yi Xu
The present study aimed to explore the possible associations between the dorsolateral prefrontal cortex (DLPFC) metabolites and the cognitive function in first-episode schizophrenia (FES).This study included 58 patients with FES (29 males and 29 females; mean age, 22.66 ± 7.64 years) recruited from the First Affiliated Hospital, College of Medicine, Zhejiang University, and 43 locally recruited healthy controls (16 males and 27 females; mean age, 23.07 ± 7.49 years). The single-voxel proton magnetic resonance spectroscopy was used to measure the levels of N-acetylaspartate (NAA); complex of glutamate, glutamine, and γ-aminobutyric acid (Glx); choline-containing compounds; and myo-inositol in the DLPFC...
June 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28639045/passing-the-fundamentals-of-endoscopic-surgery-fes-exam-linking-specialty-choice-and-attitudes-about-endoscopic-surgery-to-success
#4
Aimee K Gardner, Michael B Ujiki, Brian J Dunkin
INTRODUCTION: Previous work has shown that up to 30% of graduating surgery residents fail the fundamentals of endoscopic surgery (FES) exam. This study investigated the extent to which FES pass rates differ in a specific sample of individuals who have chosen a career in GI surgery and to examine the relationships between FES performance and confidence in performing flexible endoscopy. METHODS: Fellows attending the 2016 SAGES Flexible Endoscopy Course were invited to complete the FES manual skills examination...
June 21, 2017: Surgical Endoscopy
https://www.readbyqxmd.com/read/28638392/evaluation-of-borage-extracts-as-potential-biostimulant-using-a-phenomic-agronomic-physiological-and-biochemical-approach
#5
Roberta Bulgari, Silvia Morgutti, Giacomo Cocetta, Noemi Negrini, Stefano Farris, Aldo Calcante, Anna Spinardi, Enrico Ferrari, Ilaria Mignani, Roberto Oberti, Antonio Ferrante
Biostimulants are substances able to improve water and nutrient use efficiency and counteract stress factors by enhancing primary and secondary metabolism. Premise of the work was to exploit raw extracts from leaves (LE) or flowers (FE) of Borago officinalis L., to enhance yield and quality of Lactuca sativa 'Longifolia,' and to set up a protocol to assess their effects. To this aim, an integrated study on agronomic, physiological and biochemical aspects, including also a phenomic approach, has been adopted...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28635269/the-reduction-potentials-of-fefe-hydrogenase-accessory-iron-sulfur-clusters-provide-insights-into-the-energetics-of-proton-reduction-catalysis
#6
Jacob H Artz, David W Mulder, Michael W Ratzloff, Carolyn E Lubner, Oleg A Zadvornyy, Axl X LeVan, S Garrett Williams, Michael W W Adams, Anne K Jones, Paul W King, John W Peters
An [FeFe]-hydrogenase from Clostridium pasteurianum, CpI, is a model system for biological H2 activation. In addition to the catalytic H-cluster, CpI contains four accessory iron-sulfur [FeS] clusters in a branched series that transfer electrons to and from the active site. In this work, potentiometric titrations have been employed in combination with electron paramagnetic resonance (EPR) spectroscopy at defined electrochemical potentials to gain insights into the role of the accessory clusters in catalysis...
June 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28635199/a-case-of-obstructive-sleep-apnea-syndrome-associated-with-floppy-eyelid-syndrome-positive-effect-of-cpap-therapy
#7
Roberto Porta, Laura Comini, Luca Barbano, Luca Bianchi, Michele Vitacca
The obstructive sleep apnoea syndrome (OSAS) may be associated with several eyes disorders, among which the most common is the floppy eyelid syndrome (FES). We intended to highlight the association between OSAS and FES and evaluate the effect of FES treatment with Continuous Positive Airway Pressure (CPAP). A 50-year patient with a 10-year history of snoring, sleep fragmentation and daytime sleepiness associated with several comorbidities has been studied. For six months, several ocular symptoms were present, particularly on waking up in the morning...
May 18, 2017: Monaldi Archives for Chest Disease, Archivio Monaldi Per le Malattie del Torace
https://www.readbyqxmd.com/read/28634293/intrinsic-map-dynamics-exploration-for-uncharted-effective-free-energy-landscapes
#8
Eliodoro Chiavazzo, Roberto Covino, Ronald R Coifman, C William Gear, Anastasia S Georgiou, Gerhard Hummer, Ioannis G Kevrekidis
We describe and implement a computer-assisted approach for accelerating the exploration of uncharted effective free-energy surfaces (FESs). More generally, the aim is the extraction of coarse-grained, macroscopic information from stochastic or atomistic simulations, such as molecular dynamics (MD). The approach functionally links the MD simulator with nonlinear manifold learning techniques. The added value comes from biasing the simulator toward unexplored phase-space regions by exploiting the smoothness of the gradually revealed intrinsic low-dimensional geometry of the FES...
June 20, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28624138/serum-ncam-levels-and-cognitive-deficits-in-first-episode-schizophrenia-patients-versus-health-controls
#9
HuiMei An, LuPing Zhou, Yinghua Yu, Hongzhen Fan, FengMei Fan, Shuping Tan, ZhiRen Wang, Boz Z, Jing Shi, FuDe Yang, Xiangyang Zhang, Yunlong Tan, Xu-Feng Huang
BACKGROUND: Neural cell adhesion molecule (NCAM) is a glycoprotein and plays an important role in cell-cell adhesion, neural migration, neurite outgrowth, synaptic plasticity and brain development. We investigated the relationship between the serum NCAM concentration and cognitive deficit in first episode drug naïve schizophrenia (FES) patients. METHODS: Thirty FES patients and thirty healthy controls were recruited for this study. Psychiatric symptoms were assessed by the positive and negative syndrome scale (PANSS)...
June 15, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28612678/orthotic-and-therapeutic-effect-of-functional-electrical-stimulation-on-fatigue-induced-gait-patterns-in-people-with-multiple-sclerosis
#10
Christopher J Barr, Benjamin L Patritti, Rebecca Bowes, Maria Crotty, James V McLoughlin
PURPOSE: To assess the orthotic and therapeutic effects of prolonged use of functional electrical stimulation (FES) on fatigue induced gait patterns in people with Multiple Sclerosis (MS). METHOD: Thirteen people with MS completed 3D gait analysis with FES off and on, before and after a fatiguing 6-minute walk, at baseline and after 8 weeks of use of FES. RESULTS: Eleven participants completed all testing. An orthotic effect on gait was not evident on first use of FES...
August 2017: Disability and Rehabilitation. Assistive Technology
https://www.readbyqxmd.com/read/28611457/strong-3d-and-1d-magnetism-in-hexagonal-fe-chalcogenides-fes-and-fese-vs-weak-magnetism-in-hexagonal-fete
#11
David S Parker
We present a comparative theoretical study of the hexagonal forms of the Fe-chalcogenides FeS, FeSe and FeTe with their better known tetragonal forms. While the tetragonal forms exhibit only an incipient antiferromagnetism and experimentally show superconductivity when doped, the hexagonal forms of FeS and FeSe display a robust magnetism. We show that this strong magnetism arises from a van Hove singularity associated with the direct Fe-Fe c-axis chains in the generally more three-dimensional NiAs structure...
June 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28603459/outcomes-after-functional-electrical-stimulation-cycle-training-in-individuals-with-multiple-sclerosis-who-are-nonambulatory
#12
Deborah Backus, Blake Burdett, Laura Hawkins, Christine Manella, Kevin K McCully, Mark Sweatman
BACKGROUND: Exercise is safe and beneficial for people with multiple sclerosis (MS). Functional electrical stimulation (FES) cycling offers people with significant weakness and mobility challenges an option for exercise. We sought to evaluate the safety of FES cycling and its potential to improve fatigue, pain, spasticity, and quality of life in people with moderate-to-severe MS. METHODS: Sixteen participants with MS who were nonambulatory cycled for 30 minutes two to three times a week for 1 month...
May 2017: International Journal of MS Care
https://www.readbyqxmd.com/read/28595744/functional-electrical-stimulation-improves-quality-of-life-by-reducing-intermittent-claudication
#13
David G Embrey, Gad Alon, Brenna A Brandsma, Felix Vladimir, Angela Silva, Bethann M Pflugeisen, Paul J Amoroso
OBJECTIVE: To determine if Functional Electrical Stimulation (FES) would improve ischemic pain, walking distance, and quality of life of patients with intermittent claudication. DESIGN: Single blind, randomized block, two factorial design. PATIENTS: Patients diagnosed with Peripheral Artery Disease (PAD) and intermittent claudication (IC). Ankle Brachial Index ranged 0.4-0.9 on at least one leg. Patients were randomly assigned to experimental (FES+Walk, N=13) or control (WALK, N=14) groups...
June 2, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28589301/investigating-the-role-s-of-suft-and-the-domain-of-unknown-function-59-duf59-in-the-maturation-of-iron-sulfur-proteins
#14
REVIEW
Ameya A Mashruwala, Jeffrey M Boyd
Comprehending biology at the molecular and systems levels is predicated upon understanding the functions of proteins. Proteins are typically composed of one or more functional moieties termed domains. Members of Bacteria, Eukarya, and Archaea utilize proteins containing a domain of unknown function (DUF) 59. Proteins requiring iron-sulfur (FeS) clusters containing cofactors are necessary for nearly all organisms making the assembly of functional FeS proteins essential. Recently, studies in eukaryotic and bacterial organisms have shown that proteins containing a DUF59, or those composed solely of DUF59, function in FeS protein maturation and/or intracellular Fe homeostasis...
June 6, 2017: Current Genetics
https://www.readbyqxmd.com/read/28585837/postsynthetic-approach-for-the-rational-design-of-chiral-ferroelectric-metal-organic-frameworks
#15
Marta Mon, Jesús Ferrando-Soria, Michel Verdaguer, Cyrille Train, Charles Paillard, Brahim Dkhil, Carlo Versace, Rosaria Bruno, Donatella Armentano, Emilio Pardo
Ferroelectrics (FEs) are materials of paramount importance with a wide diversity of applications. Herein, we propose a postsynthetic methodology for the smart implementation of ferroelectricity in chiral metal-organic frameworks (MOFs): following a single-crystal to single-crystal cation metathesis, the Ca(2+) counterions of a preformed chiral MOF of formula Ca6(II){Cu(II)24[(S,S)-hismox]12(OH2)3}·212H2O (1), where hismox is a chiral ligand derived from the natural amino acid l-histidine, are replaced by CH3NH3(+)...
June 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28582881/participation-and-community-based-walking-activity-after-neuroprosthesis-use-in-children-with-hemiplegic-cerebral-palsy-a-pilot-study1
#16
Amy F Bailes, Cailee Caldwell, Mike Clay, Melissa Tremper, Kari Dunning, Jason Long
PURPOSE: To explore the effects of neuroprosthesis use on participation, level of community-based walking activity, safety and satisfaction in children with hemiplegic CP. METHODS: Eleven children (mean 9 years 11 months) with hemiplegic CP Gross Motor Function Classification System (GMFCS) Level I and II participated in a 16-week intervention using the Ness L300 neuroprosthesis. Outcome measures included satisfaction and performance with self-selected participation goals (Canadian Occupational Performance Measure (COPM)), level of community-based walking activity (Step Watch Activity Monitor (SAM)), trip and fall frequency (caregiver report) and a satisfaction questionnaire...
May 17, 2017: Journal of Pediatric Rehabilitation Medicine
https://www.readbyqxmd.com/read/28580110/superconductivity-and-magnetism-in-iron-sulfides-intercalated-by-metal-hydroxides
#17
Xiuquan Zhou, Christopher Eckberg, Brandon Wilfong, Sz-Chian Liou, Hector K Vivanco, Johnpierre Paglione, Efrain E Rodriguez
Inspired by naturally occurring sulfide minerals, we present a new family of iron-based superconductors. A metastable form of FeS known as the mineral mackinawite forms two-dimensional sheets that can be readily intercalated by various cationic guest species. Under hydrothermal conditions using alkali metal hydroxides, we prepare three different cation and metal hydroxide-intercalated FeS phases including (Li1-x Fe x OH)FeS, [(Na1-x Fe x )(OH)2]FeS, and K x Fe2-y S2. Upon successful intercalation of the FeS layer, the superconducting critical temperature Tc of mackinawite is enhanced from 5 K to 8 K for the (Li1-x Fe x OH) (δ+) intercalate...
May 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28571696/functional-electrical-stimulation-improves-muscle-strength-and-endurance-in-patients-after-cardiac-surgery-a-randomized-controlled-trial
#18
Jociane Schardong, Gabriela Castro Kuinchtner, Graciele Sbruzzi, Rodrigo Della Méa Plentz, Antônio Marcos Vargas da Silva
BACKGROUND: Functional electrical stimulation (FES) has shown benefits in patients with chronic heart failure. Therefore, it is possible that FES can benefit patients similarly after cardiac surgery. OBJECTIVE: This randomized placebo-controlled trial aimed to evaluate the effects of FES on lower limb functional capacity, strength, endurance, and muscle mass after discharge from cardiac surgery. METHODS: Twenty patients were allocated (1:1) to the group receiving FES to the quadriceps (FESG) or FES placebo (FESPG)...
May 19, 2017: Brazilian Journal of Physical Therapy
https://www.readbyqxmd.com/read/28569162/psychometric-properties-of-the-original-and-short-versions-of-the-falls-efficacy-scale-international-fes-i-in-people-with-parkinson-s-disease
#19
Stina B Jonasson, Maria H Nilsson, Jan Lexell
BACKGROUND: Fear of falling is common in people with Parkinson's disease (PD) and is associated with an increased risk for future falls, activity limitations and a reduced quality of life. The Falls Efficacy Scale-International (FES-I) assesses fear of falling conceptualized as concerns about falling. The original FES-I has good psychometric properties in people with PD, but whether this applies also for the short version of FES-I remains to be shown. The aim of the present study was to evaluate the psychometric properties of the short FES-I and to compare these with the original FES-I in the same sample of people with PD...
May 31, 2017: Health and Quality of Life Outcomes
https://www.readbyqxmd.com/read/28559094/-fear-of-falling-validation-of-a-measurement-tool-in-chilean-elderly-living-in-the-community
#20
Alejandra Ximena Araya, Eduardo Valenzuela, Oslando Padilla, Evelyn Iriarte, Camila Caro
INTRODUCCIóN: Fear of falling, with or without previous falls history, is a risk factor for decreased mobility, disability, as well as a decreased quality of life, and can trigger the self-restriction of activities with loss of independence and functionality. Validated tools for measuring the fear of falling in the Chilean population is a needed to detect those at risk. There are currently no validated instruments to measure this phenomenon in Chile. The aim of this study is to validate the Spanish version of the short «Falls Efficacy Scale-International» (FES-I) in an elderly population living in the community in Chile...
May 27, 2017: Revista Española de Geriatría y Gerontología
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