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https://www.readbyqxmd.com/read/29166313/the-perineal-turnover-perforator-flap-a-new-and-simple-technique-for-perineal-reconstruction-after-extralevator-abdominoperineal-excision
#1
Maria Chasapi, Mohamed Maher, Peter Mitchell, Milind Dalal
BACKGROUND: Extralevator abdominoperineal excision (ELAPE) is increasingly used to treat locally advanced low rectal cancer as it has been related to superior oncological outcomes than traditional abdominoperineal excision.However, ELAPE also has been associated with high perineal wound morbidity rates as it creates a larger perineal cavity than standard abdominoperineal excision. This greater defect, along with the effects of preoperative chemoradiation on wound healing, makes uneventful perineal reconstruction post-ELAPE a real challenge for the plastic surgeon...
November 21, 2017: Annals of Plastic Surgery
https://www.readbyqxmd.com/read/29165761/protein-metabolism-and-exercise-in-children-a-review
#2
G Liu, Z-G Li, H-W Wu
General nutritional strategies to promote whole body protein retention, particularly with relation to exercise, have been largely based on adult research that does not consider the dynamic process of growth and often ignores scenarios commonly experienced by children (e.g., exercise in the heat). Therefore, the aim of the present review is to highlight the importance of post-exercise protein quantity and timing in active children, specifically with respect to the whole body protein turnover.
October 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/29165441/dna-crowded-enzyme-complexes-with-enhanced-activities-and-stabilities
#3
John Collins, Ting Zhang, Sung Won Oh, Robert Maloney, Jinglin Fu
We present a robust and simple method to prepare DNA-crowded enzyme complexes by directly assembling long DNA duplexes on the enzyme surface. DNA-crowded enzyme complexes show boosted substrate turnover numbers, and increased stabilities against various storage conditions. They could be potentially scaled up for applications in biomaterials and biotechnology.
November 22, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29164873/plasma-protein-turnover-rates-in-rats-using-stable-isotope-labeling-global-proteomics-and-activity-based-protein-profiling
#4
Jordan Ned Smith, Kimberly J Tyrrell, Joshua R Hansen, Dennis George Thomas, Taylor A Murphree, Anil K Shukla, Teresa Luders, James M Madden, YunYing Li, Aaron T Wright, Paul D Piehowski
Protein turnover is important for general health on cellular and organism scales providing a strategy to replace old, damaged, or dysfunctional proteins. Protein turnover also informs of biomarker kinetics, as a better understanding of synthesis and degradation of proteins increases the clinical utility of biomarkers. Here, turnover rates of plasma proteins in rats were measured in vivo using a pulse-chase stable isotope labeling experiment. During the pulse, rats (n=5) were fed 13C6-labeled lysine ("heavy") feed for 23 days to label proteins...
November 22, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29164377/systemic-and-local-effects-of-vaginal-dehydroepiandrosterone-dhea-ncctg-n10c1-alliance
#5
Debra L Barton, Lynne T Shuster, Travis Dockter, Pamela J Atherton, Jacqueline Thielen, Stephen N Birrell, Richa Sood, Patricia Griffin, Shelby A Terstriep, Bassam Mattar, Jacqueline M Lafky, Charles L Loprinzi
BACKGROUND: Dehydroepiandrosterone (DHEA) is helpful for treating vaginal symptoms. This secondary analysis evaluated the impact of vaginal DHEA on hormone concentrations, bone turnover, and vaginal cytology in women with a cancer history. METHODS: Postmenopausal women, diagnosed with breast or gynecologic cancer, were eligible if they reported at least moderate vaginal symptoms. Participants could be on tamoxifen or aromatase inhibitors (AIs). Women were randomized to 3...
November 21, 2017: Supportive Care in Cancer: Official Journal of the Multinational Association of Supportive Care in Cancer
https://www.readbyqxmd.com/read/29163928/understanding-single-enzyme-activity-via-the-nano-impact-technique
#6
Chuhong Lin, Enno Kätelhön, Lior Sepunaru, Richard G Compton
To evaluate the possible detection of single enzyme activity via electrochemical methods, a combined finite difference and random walk simulation is used to model individual enzyme-electrode collisions where such events are monitored amperometrically via the measurement of products formed by the enzyme in solution. It is found that the observed signal is highly sensitive to both the enzyme turnover number, the size of the electrode and the bandwidth of the electronics. Taking single catalase impacts as an example, simulation results are compared with experimental data...
September 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/29163905/laboratory-scale-photoredox-catalysis-using-hydrated-electrons-sustainably-generated-with-a-single-green-laser
#7
Robert Naumann, Christoph Kerzig, Martin Goez
The ruthenium-tris-bipyridyl dication as catalyst combined with the ascorbate dianion as bioavailable sacrificial donor provides the first regenerative source of hydrated electrons for chemical syntheses on millimolar scales. This electron generator is operated simply by illumination with a frequency-doubled Nd:YAG laser (532 nm) running at its normal repetition rate. Much more detailed information than by product studies alone was obtained by photokinetical characterization from submicroseconds (time-resolved laser flash photolysis) up to one hour (preparative photolysis)...
November 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/29163586/photosynthetic-entrainment-of-the-circadian-clock-facilitates-plant-growth-under-environmental-fluctuations-perspectives-from-an-integrated-model-of-phase-oscillator-and-phloem-transportation
#8
Takayuki Ohara, Akiko Satake
Plants need to avoid carbon starvation and resultant growth inhibition under fluctuating light environments to ensure optimal growth and reproduction. As diel patterns of carbon metabolism are influenced by the circadian clock, appropriate regulation of the clock is essential for plants to properly manage their carbon resources. For proper adjustment of the circadian phase, higher plants utilize environmental signals such as light or temperature and metabolic signals such as photosynthetic products; the importance of the latter as phase regulators has been recently elucidated...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29163287/corporate-social-responsibility-and-employee-outcomes-a-moderated-mediation-model-of-organizational-identification-and-moral-identity
#9
Wei Wang, Ying Fu, Huiqing Qiu, James H Moore, Zhongming Wang
Corporate social responsibility (CSR) research is not new, but its importance to today's socially conscious market environment is even more evident in recent years. This study moves beyond CSR as simply the socially responsible actions and policies of organizations and focuses on the complex psychology of CSR as it relates to individuals within the organization. Given CSR can positively affect both the individuals within the organization and the organization itself, better understanding and leveraging the mechanisms and conditions of CSR that facilitate desired employee outcomes is crucial for organizational performance...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/29163188/elevated-levels-of-peripheral-kynurenine-decrease-bone-strength-in-rats-with-chronic-kidney-disease
#10
Bartlomiej Kalaska, Krystyna Pawlak, Tomasz Domaniewski, Ewa Oksztulska-Kolanek, Beata Znorko, Alicja Roszczenko, Joanna Rogalska, Malgorzata M Brzoska, Pawel Lipowicz, Michal Doroszko, Anna Pryczynicz, Dariusz Pawlak
The diagnosis and treatment of bone disorders in patients with chronic kidney disease (CKD) represent a clinical challenge. CKD leads to mineral and bone complications starting early in the course of renal failure. Recently, we have observed the positive relationship between intensified central kynurenine turnover and bone strength in rats with subtotal 5/6 nephrectomy (5/6 Nx)-induced CKD. The aim of the present study was to determine the association between peripheral kynurenine pathway metabolites and bone strength in rats with 5/6 Nx-induced CKD...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29162487/molecular-pathways-of-cell-mediated-degradation-of-fibrillar-collagen
#11
REVIEW
Sara Sprangers, Vincent Everts
Fibrillar collagens are the most abundant components of the extracellular matrix and provide stability to connective tissues, such as bone, cartilage and skin. An imbalance in collagen turnover inevitably affects the function of these tissues. Therefore, the molecular and cellular mechanisms involved in the synthesis and degradation of collagen have received increasing attention. This short review attempts to summarize our present understanding of how different pathways of collagen degradation are used by different cell types...
November 18, 2017: Matrix Biology: Journal of the International Society for Matrix Biology
https://www.readbyqxmd.com/read/29162237/inter-individual-gene-variants-associated-with-trabecular-bone-plasticity-a-step-forward-in-the-personal-genomics-of-degenerative-bone-disease
#12
Enrique Caso, Cristina C Sabiers, Daniel López-Guillén, Jaime Caso, Manuel Toledano, Raquel Osorio, Estrella Osorio, Carmen Lozano, Enrique Guerado
Continuing tissue destruction in osteoarthrosis is maintained by molecular pathways related to an unbalanced chondrocyte metabolism, the loss of reactive oxygen species (ROS) homeostasis, increase catabolism in a degraded matrix and the limited response to growth factors due to cell aging. Rare deleterious gene variants driving relevant molecular pathways may play a key role in the pathogenesis and genetic control of common diseases and may also influence the common gene variants observed in GWAS. We use molecular profiling technologies based on massive sequencing of genes to interrogate clinical samples for a variety of molecules involved in the pathogenesis pathways of OA and also to derive new insights for drug targeting discovery at an early stage of the disease...
November 2017: Injury
https://www.readbyqxmd.com/read/29160961/a-metal-organic-framework-with-exceptional-activity-for-c-h-bond-amination
#13
Le Wang, Douglas W Agnew, Xiao Yu, Joshua S Figueroa, Seth Mason Cohen
The development of catalysts capable of fast, robust C-H bond amination under mild conditions is an unrealized goal despite substantial progress in the field of C-H activation in recent years. Here we describe a Mn-based metal-organic framework (CPF-5) that promotes the direct amination of C-H bonds with exceptional activity. CPF-5 is capable of functionalizing C-H bonds in an intermolecular fashion with unrivaled catalytic stability producing an unrivaled >105 turnovers.
November 21, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29160956/photosensitization-of-molecular-oxygen-on-graphene-oxide-for-ultrasensitive-signal-amplification
#14
Xinfeng Zhang, Li Deng, Chengpeng Huang, Jinyi Zhang, Xiandeng Hou, Peng Wu, Juewen Liu
H2O2 and horseradish peroxidase (HRP) are commonly used together in bioassays. HRP is required to accelerate the reaction between a chromogenic substrate (e.g., 3,3',5,5'-tetramethylbenzidine, TMB) and H2O2 and thus amplifies the signal. We herein explore molecular oxygen for enzyme-free and H2O2-free oxidation, while still using the same colorimetric reaction. Restricted by spin selection rules, the ground-state triplet oxygen needs to be converted to the singlet state to oxide TMB. We used phloxine B (PB) as the photosensitizer for its excellent performance and safety...
November 21, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29159482/characterizing-the-breadth-and-depth-of-volunteer-water-monitoring-programs-in-the-united-states
#15
Kristine F Stepenuck, Kenneth D Genskow
A survey of 345 volunteer water monitoring programs in the United States was conducted to document their characteristics, and perceived level of support for data to inform natural resource management or policy decisions. The response rate of 86% provided information from 46 states. Programs represented a range of ages, budgets, objectives, scopes, and level of quality assurance, which influenced data uses and perceived support by sponsoring agency administrators and external decision makers. Most programs focused on rivers, streams, and lakes...
November 20, 2017: Environmental Management
https://www.readbyqxmd.com/read/29159285/reactive-oxygen-species-leave-a-damage-trail-that-reveals-water-channels-in-photosystem-ii
#16
Daniel A Weisz, Michael L Gross, Himadri B Pakrasi
Photosystem II (PSII), a unique membrane-bound oxidoreductase, catalyzes light-driven oxidation of water to molecular oxygen. Although high-resolution structures of PSII are known, the exact path of the substrate water molecules to the catalytic Mn4CaO5 center within the PSII complex remains poorly understood. PSII produces reactive oxygen species (ROS), responsible for the frequent damage and turnover of this megacomplex that occur under physiological conditions. Such ROS are known to specifically modify PSII proteins...
November 2017: Science Advances
https://www.readbyqxmd.com/read/29158321/assembly-and-turnover-of-neurofilaments-in-growing-axonal-neurites
#17
Edward F Boumil, Rishel Vohnoutka, Sangmook Lee, Harish Pant, Thomas B Shea
Neurofilaments (NFs) are thought to provide stability to the axon. We examined NF dynamics within axonal neurites of NB2a/d1 neuroblastoma by transient transfection with green fluorescent protein-tagged NF-H (GFP-H) under the control of a tetracycline-inducible promoter. Immunofluorescent and biochemical analyses demonstrated that GFP-H expressed early during neurite outgrowth associated with a population of centrally-situated, highly-phosphorylated crosslinked NFs along the length of axonal neurites ("bundled NFs")...
November 20, 2017: Biology Open
https://www.readbyqxmd.com/read/29158203/p2x7-receptor-in-spinal-tuberculosis-gene-polymorphisms-and-protein-levels-in-chinese-han-population
#18
Ying Zhou, Chun-Yan Tan, Zhi-Jiang Mo, Qi-le Gao, Dan He, Jiong Li, Rong-Fu Huang, Yan-Bing Li, Chao-Feng Guo, Qiang Guo, Long-Jie Wang, Guan-Teng Yang, Hong-Qi Zhang
Spinal tuberculosis (TB) accounts for 1%-5% of all TB infections. Host genetic variation influences susceptibility to Mycobacterium tuberculosis (MTB). P2X7 receptor (P2X7R) expressed on cells has been identified as a regulatory molecule in cell death/apoptosis, killing of intercellular pathogens, and bone turnover. This study investigated the P2X7 gene polymorphisms and protein levels in spinal TB. P2X7 gene -762C>T and 489C>T polymorphisms were genotyped. The expression of P2X7R in bone or intervertebral disc (ID) tissues was analyzed by Western blot assay...
November 17, 2017: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/29157690/the-last-turnover
#19
EDITORIAL
Paul A Blackburn
No abstract text is available yet for this article.
December 2017: Annals of Emergency Medicine
https://www.readbyqxmd.com/read/29156943/assessment-of-biochemical-bone-turnover-markers-and-bone-mineral-density-in-thin-and-normal-weight-children
#20
Jadwiga Ambroszkiewicz, Joanna Gajewska, Grazyna Rowicka, Witold Klemarczyk, Magdalena Chelchowska
Objective There is scant research examining the prevalence of thinness in early childhood, despite its potential negative consequences for health and development across the life course. The objective of this study was to assess bone status through measurement of bone mineral density and biochemical bone turnover markers, with special attention paid to carboxylated (c-OC) as well as undercarboxylated (uc-OC) forms of osteocalcin, in the groups of thin and normal-weight children. Design The study included 80 healthy prepubertal children (median age 7...
January 1, 2017: Cartilage
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