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https://www.readbyqxmd.com/read/28938466/optogenetic-analysis-of-depolarization-dependent-glucagon-like-peptide-1-release
#1
Catalin Chimerel, Cristian Riccio, Keir Murison, Fiona M Gribble, Frank Reimann
Incretin hormones play an important role in the regulation of food intake and glucose homeostasis. Glucagon-like peptide-1 (GLP-1) secreting cells have been demonstrated to be electrically excitable and to fire action potentials (APs) with increased frequency in response to nutrient exposure. However, nutrients can also be metabolised or activate G-protein-coupled receptors, thus potentially stimulate GLP-1 secretion independent of their effects on the plasma membrane potential. Here we used channelrhodopsins to manipulate the membrane potential of GLUTag cells, a well established model of GLP-1 secreting enteroendocrine L-cells...
July 28, 2017: Endocrinology
https://www.readbyqxmd.com/read/28938175/telomere-length-and-procedural-justice-predict-stress-reactivity-responses-to-unfair-outcomes-in-african-americans
#2
Todd Lucas, Jennifer Pierce, Mark A Lumley, Douglas A Granger, Jue Lin, Elissa S Epel
This experiment demonstrates that chromosomal telomere length (TL) moderates response to injustice among African Americans. Based on worldview verification theory - an emerging psychosocial framework for understanding stress - we predicted that acute stress responses would be most pronounced when individual-level expectancies for justice were discordant with justice experiences. Healthy African Americans (N=118; 30% male; M age=31.63years) provided dried blood spot samples that were assayed for TL, and completed a social-evaluative stressor task during which high versus low levels of distributive (outcome) and procedural (decision process) justice were simultaneously manipulated...
September 7, 2017: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/28938009/altering-neuronal-excitability-to-preserve-network-connectivity-in-a-computational-model-of-alzheimer-s-disease
#3
Willem de Haan, Elisabeth C W van Straaten, Alida A Gouw, Cornelis J Stam
Neuronal hyperactivity and hyperexcitability of the cerebral cortex and hippocampal region is an increasingly observed phenomenon in preclinical Alzheimer's disease (AD). In later stages, oscillatory slowing and loss of functional connectivity are ubiquitous. Recent evidence suggests that neuronal dynamics have a prominent role in AD pathophysiology, making it a potentially interesting therapeutic target. However, although neuronal activity can be manipulated by various (non-)pharmacological means, intervening in a highly integrated system that depends on complex dynamics can produce counterintuitive and adverse effects...
September 22, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28937840/supraoptimal-activity-of-chlorophyll-dephytylase1-results-in-an-increase-in-tocopherol-level-in-mature-arabidopsis-seeds
#4
Yao-Pin Lin, Yee-Yung Charng
Tocopherols are synthesized in photosynthetic organisms, playing a role in plant stress tolerance. Recent studies showed that the phytol moiety of tocopherols comes from the salvaged phytol chain during chlorophyll degradation. However, the enzyme(s) responsible for chlorophyll dephytylation remains unclear. Recently, we reported the identification and characterization of CHLOROPHYLL DEPHYTYLASE1 (CLD1) of Arabidopsis, suggesting its role in chlorophyll turnover at steady state. In this addendum to the report, we presented and discussed the results related to the function of CLD1 in tocopherol biosynthesis...
September 22, 2017: Plant Signaling & Behavior
https://www.readbyqxmd.com/read/28937836/optimizing-a-3d-model-system-for-molecular-manipulation-of-tenogenesis
#5
Chun Chien, Brian Pryce, Sara F Tufa, Douglas R Keene, Alice H Huang
PURPOSE: Tendon injuries are clinically challenging due to poor healing. A better understanding of the molecular events that regulate tendon differentiation would improve current strategies for repair. The mouse model system has been instrumental to tendon studies and several key molecules were initially established in mouse. However, the study of gene function has been limited by the absence of a standard in vitro tendon system for efficiently testing multiple mutations, physical manipulations, and mis-expression...
September 22, 2017: Connective Tissue Research
https://www.readbyqxmd.com/read/28937756/direct-comparison-of-c-h-bond-amination-efficacy-through-manipulation-of-nitrogen-valence-centered-redox-imido-versus-iminyl
#6
Matthew J T Wilding, Diana A Iovan, Alexandra T Wrobel, James T Lukens, Samantha N MacMillan, Kyle M Lancaster, Theodore A Betley
Reduction of previously reported iminyl radical (ArL)FeCl(•N(C6H4-p-tBu)) (2) with potassium graphite furnished the corresponding high-spin (S = 5/2) imido (ArL)Fe(N(C6H4-p-tBu)) (3) (ArL = 5-mesityl-1,9-(2,4,6-Ph3C6H2)dipyrrin). Oxidation of the three-coordinate imido (ArL)Fe(NAd) (5) with chlorotriphenylmethane afforded (ArL)FeCl(•NAd) (6) with concomitant expulsion of Ph3C(C6H5)CPh2. The respective alkyl/aryl imido/iminyl pairs (3, 2; 5, 6) have been characterized by EPR, zero-field 57Fe Mössbauer, magnetometry, single crystal X-ray diffraction, XAS, and EXAFS for 6...
September 22, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28937668/complete-protein-protein-association-kinetics-in-atomic-detail-revealed-by-molecular-dynamics-simulations-and-markov-modelling
#7
Nuria Plattner, Stefan Doerr, Gianni De Fabritiis, Frank Noé
Protein-protein association is fundamental to many life processes. However, a microscopic model describing the structures and kinetics during association and dissociation is lacking on account of the long lifetimes of associated states, which have prevented efficient sampling by direct molecular dynamics (MD) simulations. Here we demonstrate protein-protein association and dissociation in atomistic resolution for the ribonuclease barnase and its inhibitor barstar by combining adaptive high-throughput MD simulations and hidden Markov modelling...
October 2017: Nature Chemistry
https://www.readbyqxmd.com/read/28937420/unexpected-left-atrial-thrombus-after-aortic-valve-replacement-and-left-atrial-ligation-with-atriclip-device-a-case-report
#8
Kinjal M Patel, Michael Rosenbloom, Muhammad Raza, Sean Stevens, Jonathan Rost, Ahmed Awad, Ronak G Desai
We report the unexpected transesophageal echocardiography (TEE) finding of a left atrial (LA) thrombus near the end of cardiopulmonary bypass and after deployment of an AtriClip (Atricure, Inc, Westchester, OH) in an 84-year-old man with atrial fibrillation and aortic stenosis undergoing aortic valve replacement and LA appendage ligation. TEE examination before cardiopulmonary bypass and deployment of the AtriClip had not shown a thrombus in the LA appendage. The heart was rearrested and thrombus was successfully removed through a left atriotomy...
September 20, 2017: A & A Case Reports
https://www.readbyqxmd.com/read/28937281/tracking-by-detection-of-surgical-instruments-in-minimally-invasive-surgery-via-the-convolutional-neural-network-deep-learning-based-method
#9
Zijian Zhao, Sandrine Voros, Ying Weng, Faliang Chang, Ruijian Li
BACKGROUND: Worldwide propagation of minimally invasive surgeries (MIS) is hindered by their drawback of indirect observation and manipulation, while monitoring of surgical instruments moving in the operated body required by surgeons is a challenging problem. Tracking of surgical instruments by vision-based methods is quite lucrative, due to its flexible implementation via software-based control with no need to modify instruments or surgical workflow. METHODS: A MIS instrument is conventionally split into a shaft and end-effector portions, while a 2D/3D tracking-by-detection framework is proposed, which performs the shaft tracking followed by the end-effector one...
September 22, 2017: Computer Assisted Surgery (Abingdon, England)
https://www.readbyqxmd.com/read/28937224/thermocapillary-droplet-actuation-effect-of-solid-structure-and-wettability
#10
George Karapetsas, Nikolaos T Chamakos, Athanasios G Papathanasiou
We examine the thermocapillary-driven flow of a droplet on a non-uniformly heated patterned surface. Using a sharp-interface scheme, capable of efficiently modelling the flow over complex surfaces, we perform 2D and 3D finite element simulations for a wide range of substrate wettabilities, i.e. from hydrophilic to super-hydrophobic surfaces. Our results demonstrate that the contact angle hysteresis, due to the presence of the solid structures, is responsible for the appearance of a critical thermal gradient beyond which droplet migration is possible that has been reported by experimental observations...
September 22, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28937074/clinicoepidemiological-profile-of-peritonitis-complicating-acute-peritoneal-dialysis-a-single-center-experience
#11
Kunal Gandhi, Dharmendra Prasad, Vinay Malhotra, Dhananjai Agrawal, Pankaj Beniwal, Amith Vijay Leon Dsouza
A prospective observational study examining the incidence and microbiological aspects of peritonitis complicating acute intermittent peritoneal dialysis (IPD) was performed. A total of 145 acute IPD treatments were included involving 112 patients. The majority of patients suffered from acute kidney injury (72.3%) secondary to sepsis. Peritonitis occurred in 31 treatment sessions, giving a frequency of 21.4% of procedures performed. The mean interval between starting dialysis and the first sign of peritonitis was 2...
September 2017: Saudi Journal of Kidney Diseases and Transplantation
https://www.readbyqxmd.com/read/28936946/genetic-tools-for-the-enhancement-of-probiotic-properties
#12
Laura Ortiz-Velez, Robert Britton
The Lactobacillus genus is a diverse group of microorganisms, many of which are of industrial and medical relevance. Several Lactobacillus species have been used as probiotics, organisms that when present in sufficient quantities confer a health benefit to the host. A significant limitation to the mechanistic understanding of how these microbes provide health benefits to their hosts and how they can be used as therapeutic delivery systems has been the lack of genetic strategies to efficiently manipulate their genomes...
September 2017: Microbiology Spectrum
https://www.readbyqxmd.com/read/28936807/on-the-role-of-language-membership-information-during-word-recognition-in-bilinguals-evidence-from-flanker-language-congruency-effects
#13
Mathieu Declerck, Joshua Snell, Jonathan Grainger
According to some bilingual language comprehension models (e.g., BIA), language membership information has a direct influence on word processing. However, this idea is not shared by all models (e.g., BIA+). To investigate this matter, we manipulated the language membership of irrelevant flanking words while French-English bilinguals performed a lexical decision task on centrally located target words and nonwords. The target words were either French or English words, flanked by words that were either in the same language as the target (language congruent) or in the other language (language incongruent)...
September 21, 2017: Psychonomic Bulletin & Review
https://www.readbyqxmd.com/read/28936790/favorable-results-from-a-prospective-evaluation-of-200-patients-with-large-hiatal-hernias-undergoing-linx-magnetic-sphincter-augmentation
#14
F P Buckley, Reginald C W Bell, Kate Freeman, Stephanie Doggett, Rachel Heidrick
INTRODUCTION: Magnetic sphincter augmentation (MSA) of the lower esophageal sphincter restores the antireflux barrier in patients with hiatal hernias ≤3 cm. We performed a prospective study in patients undergoing MSA with the LINX device during repair of paraesophageal and hernias over 3 cm axial component. METHODS AND PROCEDURES: Multicenter, prospective study of consecutive patients treated with MSA at the time of repair of hiatal hernias >3 cm. RESULTS: 200 patients (110 female) were treated between March 2014 and February 2017 via laparoscopic hernia repair and MSA...
September 21, 2017: Surgical Endoscopy
https://www.readbyqxmd.com/read/28936755/comparison-of-control-strategies-for-single-stage-partial-nitrification-anammox-granular-sludge-reactor-for-mainstream-sewage-treatment-a-model-based-evaluation
#15
Jun Wu
The low ammonium concentration, low temperature, presence of organic matter, and large variation of influent ammonium load pose serious challenges for the application of PN/AMX (partial nitrification-anammox) reactor in the mainstream wastewater treatment. Previous mathematical simulation studies of PN/AMX granule reactor mainly concentrated on the steady-state modeling. The steady-state simulation cannot be used for developing control strategies under dynamic condition. In this study, four control strategies were evaluated on their abilities to minimize the impact of feed disturbances on autotrophic nitrogen removal in mainstream wastewater...
September 21, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28936674/conditional-modulation-of-biological-processes-by-low-temperature-degrons
#16
Nico Dissmeyer
Conditional modulation of biological processes plays key roles in basic and applied research and in translation. It can be achieved on various levels via a multitude of approaches. One of the directions is manipulating target protein levels and activity by transcriptional, posttranscriptional, translational, and posttranslational control. Because in most of these techniques, the synthesis of the target proteins is adjusted to the needs, they all rely on the specific half-life of the target protein and its turn-over...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28936277/self-limiting-adsorption-of-wo3-oligomers-on-oxide-substrates-in-solution
#17
Matthias Müllner, Jan Balajka, Michael Schmid, Ulrike Diebold, Stijn F L Mertens
Electrochemical surface science of oxides is an emerging field with expected high impact in developing, for instance, rationally designed catalysts. The aim in such catalysts is to replace noble metals by earth-abundant elements, yet without sacrificing activity. Gaining an atomic-level understanding of such systems hinges on the use of experimental surface characterization techniques such as scanning tunneling microscopy (STM), in which tungsten tips have been the most widely used probes, both in vacuum and under electrochemical conditions...
September 14, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28936208/cas9-nickase-assisted-rna-repression-enables-stable-and-efficient-manipulation-of-essential-metabolic-genes-in-clostridium-cellulolyticum
#18
Tao Xu, Yongchao Li, Zhili He, Joy D Van Nostrand, Jizhong Zhou
Essential gene functions remain largely underexplored in bacteria. Clostridium cellulolyticum is a promising candidate for consolidated bioprocessing; however, its genetic manipulation to reduce the formation of less-valuable acetate is technically challenging due to the essentiality of acetate-producing genes. Here we developed a Cas9 nickase-assisted chromosome-based RNA repression to stably manipulate essential genes in C. cellulolyticum. Our plasmid-based expression of antisense RNA (asRNA) molecules targeting the phosphotransacetylase (pta) gene successfully reduced the enzymatic activity by 35% in cellobiose-grown cells, metabolically decreased the acetate titer by 15 and 52% in wildtype transformants on cellulose and xylan, respectively...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28935949/tunable-polarization-conversion-and-rotation-based-on-a-reconfigurable-metasurface
#19
M Zhang, W Zhang, A Q Liu, F C Li, C F Lan
Polarization is an important property of electromagnetic (EM) wave and different polarization manipulations are required for varied optical applications. Here we report a reconfigurable metasurface which achieves both the polarization conversion and the polarization rotation in THz regime. The metasurface is reconfigured through the micro-electro-mechanical-systems (MEMS) actuation. The cross polarization transmittance from a linear polarized incidence is experimentally tuned from 0 to 28% at 2.66 THz. In addition, the polarization rotation angle is effectively changed from -12...
September 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28935897/a-gateway-towards-non-collinear-spin-processing-using-three-atom-magnets-with-strong-substrate-coupling
#20
J Hermenau, J Ibañez-Azpiroz, Chr Hübner, A Sonntag, B Baxevanis, K T Ton, M Steinbrecher, A A Khajetoorians, M Dos Santos Dias, S Blügel, R Wiesendanger, S Lounis, J Wiebe
A cluster of a few magnetic atoms on the surface of a nonmagnetic substrate is one suitable realization of a bit for spin-based information technology. The prevalent approach to achieve magnetic stability is decoupling the cluster spin from substrate conduction electrons in order to suppress destabilizing spin-flips. However, this route entails less flexibility in tailoring the coupling between the bits needed for spin-processing. Here, we use a spin-resolved scanning tunneling microscope to write, read, and store spin information for hours in clusters of three atoms strongly coupled to a substrate featuring a cloud of non-collinearly polarized host atoms, a so-called non-collinear giant moment cluster...
September 21, 2017: Nature Communications
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