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result(s) for
"Gray, Scott"
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State responsibility for non-state actors : past, present, and prospects for the future
by
Scott, Richard Mackenzie-Gray, author
in
Government liability (International law)
,
Non-state actors (International relations)
2022
\"This book investigates how state responsibility can be determined for the wrongdoing of non-state actors. Every day, people, businesses and societies around the world pay a price arising from interactions between states and non-state actors. From insurrections that attempt to create new governments, to states arming belligerent proxies operating overseas, to companies damaging natural environments or providing suspect services, the impact of such situations are felt in numerous ways. They also raise many questions relating to responsibility. In answering these, State Responsibility for Non-State Actors provides a picture of what the law governing this area is, what it could be, and what it should be in light of past histories, present realities and future prospects\"-- Provided by publisher.
Exposure to HIV-1 Directly Impairs Mucosal Epithelial Barrier Integrity Allowing Microbial Translocation
by
Arsenault, A. Larry
,
Chan, Olivia
,
Dobson-Belaire, Wendy N.
in
Acquired immune deficiency syndrome
,
Adult
,
AIDS
2010
While several clinical studies have shown that HIV-1 infection is associated with increased permeability of the intestinal tract, there is very little understanding of the mechanisms underlying HIV-induced impairment of mucosal barriers. Here we demonstrate that exposure to HIV-1 can directly breach the integrity of mucosal epithelial barrier, allowing translocation of virus and bacteria. Purified primary epithelial cells (EC) isolated from female genital tract and T84 intestinal cell line were grown to form polarized, confluent monolayers and exposed to HIV-1. HIV-1 X4 and R5 tropic laboratory strains and clinical isolates were seen to reduce transepithelial resistance (TER), a measure of monolayer integrity, by 30-60% following exposure for 24 hours, without affecting viability of cells. The decrease in TER correlated with disruption of tight junction proteins (claudin 1, 2, 4, occludin and ZO-1) and increased permeability. Treatment of ECs with HIV envelope protein gp120, but not HIV tat, also resulted in impairment of barrier function. Neutralization of gp120 significantly abrogated the effect of HIV. No changes to the barrier function were observed when ECs were exposed to Env defective mutant of HIV. Significant upregulation of inflammatory cytokines, including TNF-alpha, were seen in both intestinal and genital epithelial cells following exposure to HIV-1. Neutralization of TNF-alpha reversed the reduction in TERs. The disruption in barrier functions was associated with viral and bacterial translocation across the epithelial monolayers. Collectively, our data shows that mucosal epithelial cells respond directly to envelope glycoprotein of HIV-1 by upregulating inflammatory cytokines that lead to impairment of barrier functions. The increased permeability could be responsible for small but significant crossing of mucosal epithelium by virus and bacteria present in the lumen of mucosa. This mechanism could be particularly relevant to mucosal transmission of HIV-1 as well as immune activation seen in HIV-1 infected individuals.
Journal Article
Rover throws a party : inspired by NASA's curiosity on Mars
by
Gray, Kristin L., author
,
Magoon, Scott, editor
in
Curiosity (Spacecraft) Juvenile literature.
,
United States. National Aeronautics and Space Administration Juvenile literature.
,
Roving vehicles (Astronautics) Juvenile literature.
2020
Non-polar ether-based electrolyte solutions for stable high-voltage non-aqueous lithium metal batteries
2023
The electrochemical instability of ether-based electrolyte solutions hinders their practical applications in high-voltage Li metal batteries. To circumvent this issue, here, we propose a dilution strategy to lose the Li
+
/solvent interaction and use the dilute non-aqueous electrolyte solution in high-voltage lithium metal batteries. We demonstrate that in a non-polar dipropyl ether (DPE)-based electrolyte solution with lithium bis(fluorosulfonyl) imide salt, the decomposition order of solvated species can be adjusted to promote the Li
+
/salt-derived anion clusters decomposition over free ether solvent molecules. This selective mechanism favors the formation of a robust cathode electrolyte interphase (CEI) and a solvent-deficient electric double-layer structure at the positive electrode interface. When the DPE-based electrolyte is tested in combination with a Li metal negative electrode (50 μm thick) and a LiNi
0.8
Co
0.1
Mn
0.1
O
2
-based positive electrode (3.3 mAh/cm
2
) in pouch cell configuration at 25 °C, a specific discharge capacity retention of about 74% after 150 cycles (0.33 and 1 mA/cm
2
charge and discharge, respectively) is obtained.
Ether solvents have poor anodic stabilities in lithium metal batteries. Here, the authors propose a non-aqueous electrolyte solution with a non-polar and non-fluorinated ether solvent. The electrolyte enables stable cycling of high-voltage Li metal batteries in pouch cell configuration.
Journal Article
The Cake Monster
by
Weinberg, Jennifer, 1970- author
,
VanTuyle, David, illustrator
,
Gray, Scott
in
Birthdays Juvenile fiction.
,
Ghouls and ogres Juvenile fiction.
,
Magic Juvenile fiction.
2015
Ogre Doug's birthday is today, but Cake Monster wants to eat the cake!
Paradoxical network excitation by glutamate release from VGluT3+ GABAergic interneurons
2020
In violation of Dale’s principle several neuronal subtypes utilize more than one classical neurotransmitter. Molecular identification of vesicular glutamate transporter three and cholecystokinin expressing cortical interneurons (CCK+VGluT3+INTs) has prompted speculation of GABA/glutamate corelease from these cells for almost two decades despite a lack of direct evidence. We unequivocally demonstrate CCK+VGluT3+INT-mediated GABA/glutamate cotransmission onto principal cells in adult mice using paired recording and optogenetic approaches. Although under normal conditions, GABAergic inhibition dominates CCK+VGluT3+INT signaling, glutamatergic signaling becomes predominant when glutamate decarboxylase (GAD) function is compromised. CCK+VGluT3+INTs exhibit surprising anatomical diversity comprising subsets of all known dendrite targeting CCK+ interneurons in addition to the expected basket cells, and their extensive circuit innervation profoundly dampens circuit excitability under normal conditions. However, in contexts where the glutamatergic phenotype of CCK+VGluT3+INTs is amplified, they promote paradoxical network hyperexcitability which may be relevant to disorders involving GAD dysfunction such as schizophrenia or vitamin B6 deficiency.
Journal Article
The rough guide to Japan
In full colour throughout, this guide is packed with essential information on the latest and best places to sleep, eat, party and shop and includes pointers on etiquette and other cultural niceties. Maps of all the main tourist destinations and easy-to-read color transportation maps of the Tokyo and Osaka train and subway systems help you navigate the major cities.
TIFA Signaling in Gastric Epithelial Cells Initiates the cag Type 4 Secretion System-Dependent Innate Immune Response to Helicobacter pylori Infection
by
Gaudet, Ryan G.
,
Gall, Alevtina
,
Gray-Owen, Scott D.
in
Adaptor Proteins, Signal Transducing - genetics
,
Adaptor Proteins, Signal Transducing - metabolism
,
Antibiotic resistance
2017
Helicobacter pylori is a bacterial pathogen that colonizes the human stomach, causing inflammation which, in some cases, leads to gastric ulcers and cancer. The clinical outcome of infection depends on a complex interplay of bacterial, host genetic, and environmental factors. Although H. pylori is recognized by both the innate and adaptive immune systems, this rarely results in bacterial clearance. Gastric epithelial cells are the first line of defense against H. pylori and alert the immune system to bacterial presence. Cytosolic delivery of proinflammatory bacterial factors through the cag type 4 secretion system ( cag -T4SS) has long been appreciated as the major mechanism by which gastric epithelial cells detect H. pylori . Classically attributed to the peptidoglycan sensor NOD1, recent work has highlighted the role of NOD1-independent pathways in detecting H. pylori ; however, the bacterial and host factors involved have remained unknown. Here, we show that bacterially derived heptose-1,7-bisphosphate (HBP), a metabolic precursor in lipopolysaccharide (LPS) biosynthesis, is delivered to the host cytosol through the cag -T4SS, where it activates the host tumor necrosis factor receptor-associated factor (TRAF)-interacting protein with forkhead-associated domain (TIFA)-dependent cytosolic surveillance pathway. This response, which is independent of NOD1, drives robust NF-κB-dependent inflammation within hours of infection and precedes NOD1 activation. We also found that the CagA toxin contributes to the NF-κB-driven response subsequent to TIFA and NOD1 activation. Taken together, our results indicate that the sequential activation of TIFA, NOD1, and CagA delivery drives the initial inflammatory response in gastric epithelial cells, orchestrating the subsequent recruitment of immune cells and leading to chronic gastritis. IMPORTANCE H. pylori is a globally prevalent cause of gastric and duodenal ulcers and cancer. H. pylori antibiotic resistance is rapidly increasing, and a vaccine remains elusive. The earliest immune response to H. pylori is initiated by gastric epithelial cells and sets the stage for the subsequent immunopathogenesis. This study revealed that host TIFA and H. pylori -derived HBP are critical effectors of innate immune signaling that account for much of the inflammatory response to H. pylori in gastric epithelial cells. HBP is delivered to the host cell via the cag -T4SS at a time point that precedes activation of the previously described NOD1 and CagA inflammatory pathways. Manipulation of the TIFA-driven immune response in the host and/or targeting of ADP-heptose biosynthesis enzymes in H. pylori may therefore provide novel strategies that may be therapeutically harnessed to achieve bacterial clearance. H. pylori is a globally prevalent cause of gastric and duodenal ulcers and cancer. H. pylori antibiotic resistance is rapidly increasing, and a vaccine remains elusive. The earliest immune response to H. pylori is initiated by gastric epithelial cells and sets the stage for the subsequent immunopathogenesis. This study revealed that host TIFA and H. pylori -derived HBP are critical effectors of innate immune signaling that account for much of the inflammatory response to H. pylori in gastric epithelial cells. HBP is delivered to the host cell via the cag -T4SS at a time point that precedes activation of the previously described NOD1 and CagA inflammatory pathways. Manipulation of the TIFA-driven immune response in the host and/or targeting of ADP-heptose biosynthesis enzymes in H. pylori may therefore provide novel strategies that may be therapeutically harnessed to achieve bacterial clearance.
Journal Article
Titans. Vol. 4, Titans apart
\"While Donna Troy is kept under observation in the Justice League's watchtower to determine the link between Donna and her evil future self, Troia, the rest of the team is told to stand down and take a break. That doesn't sit well with Arsenal, though. Seemingly abandoned by his friends, Roy Harper pushes himself right to the edge to track down the source of a dangerous new street drug--even teaming up with his deadly ex, Cheshire. But while Arsenal may be in over his head, his investigation reveals a worldwide threat that even the Justice League proves unable to stop\"-- Provided by publisher.
Holder pasteurization of donated human milk is effective in inactivating SARS-CoV-2
by
Guvenc, Furkan
,
Unger, Sharon
,
O’Connor, Deborah L.
in
Baby foods
,
Betacoronavirus - growth & development
,
Coronavirus Infections - prevention & control
2020
Provision of pasteurized donor human milk, as a bridge to mother’s own milk, is the standard of care for very low-birth-weight infants in hospital. The aim of this research was to confirm that Holder pasteurization (62.5°C for 30 min) would be sufficient to inactivate severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in donated human milk samples.
We spiked frozen milk samples from 10 donors to the Rogers Hixon Ontario Human Milk Bank with SARS-CoV-2 to achieve a final concentration of 1 × 107 TCID50/mL (50% of the tissue culture infectivity dose per mL). We pasteurized samples using the Holder method or held them at room temperature for 30 minutes and plated serial dilutions on Vero E6 cells for 5 days. We included comparative controls in the study using milk samples from the same donors without addition of virus (pasteurized and unpasteurized) as well as replicates of Vero E6 cells directly inoculated with SARS-CoV-2. We reported cytopathic effects as TCID50/mL.
We detected no cytopathic activity in any of the SARS-CoV-2–spiked milk samples that had been pasteurized using the Holder method. In the SARS-CoV-2–spiked milk samples that were not pasteurized but were kept at room temperature for 30 minutes, we observed a reduction in infectious viral titre of about 1 log.
Pasteurization of human milk by the Holder method (62.5°C for 30 min) inactivates SARS-CoV-2. Thus, in the event that donated human milk contains SARS-CoV-2 by transmission through the mammary gland or by contamination, this method of pasteurization renders milk safe for consumption and handling by care providers.
Journal Article