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https://www.readbyqxmd.com/read/28539334/spatiotemporal-analysis-of-spontaneous-myogenic-contractions-in-the-urinary-bladder-of-the-rabbit-timing-and-patterns-reflect-reported-electrophysiology
#1
Corrin M Hulls, Roger Graham Lentle, Quinten M King, Gordon W Reynolds, J P Chambers
The dynamics of propagating myogenic contractions in the wall of the resting ex vivo urinary bladder of the rabbit were characterised by spatiotemporal maps and related to cyclic variation in intravesical pressure (pves). Patches of propagating contractions (PPCs) enlarged and involuted in near synchrony with peaks in intravesical pressure (pves) (3.85 mean ± 0.3cpm). and were preceded by regions of stretch. The maximum area of the bladder undergoing contraction (55.28±2.65 %) and the sizes of individual PPCs (42...
May 24, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28467829/whole-genome-landscapes-of-major-melanoma-subtypes
#2
Nicholas K Hayward, James S Wilmott, Nicola Waddell, Peter A Johansson, Matthew A Field, Katia Nones, Ann-Marie Patch, Hojabr Kakavand, Ludmil B Alexandrov, Hazel Burke, Valerie Jakrot, Stephen Kazakoff, Oliver Holmes, Conrad Leonard, Radhakrishnan Sabarinathan, Loris Mularoni, Scott Wood, Qinying Xu, Nick Waddell, Varsha Tembe, Gulietta M Pupo, Ricardo De Paoli-Iseppi, Ricardo E Vilain, Ping Shang, Loretta M S Lau, Rebecca A Dagg, Sarah-Jane Schramm, Antonia Pritchard, Ken Dutton-Regester, Felicity Newell, Anna Fitzgerald, Catherine A Shang, Sean M Grimmond, Hilda A Pickett, Jean Y Yang, Jonathan R Stretch, Andreas Behren, Richard F Kefford, Peter Hersey, Georgina V Long, Jonathan Cebon, Mark Shackleton, Andrew J Spillane, Robyn P M Saw, Núria López-Bigas, John V Pearson, John F Thompson, Richard A Scolyer, Graham J Mann
Melanoma of the skin is a common cancer only in Europeans, whereas it arises in internal body surfaces (mucosal sites) and on the hands and feet (acral sites) in people throughout the world. Here we report analysis of whole-genome sequences from cutaneous, acral and mucosal subtypes of melanoma. The heavily mutated landscape of coding and non-coding mutations in cutaneous melanoma resolved novel signatures of mutagenesis attributable to ultraviolet radiation. However, acral and mucosal melanomas were dominated by structural changes and mutation signatures of unknown aetiology, not previously identified in melanoma...
May 11, 2017: Nature
https://www.readbyqxmd.com/read/28450102/an-in%C3%A2-vitro-study-of-the-role-of-implant-positioning-on-ulnohumeral-articular-contact-in-distal-humeral-hemiarthroplasty
#3
Roxanna E Abhari, Ryan Willing, Graham J W King, James A Johnson
PURPOSE: To investigate the effect of implant positioning on ulnohumeral contact using patient-specific distal humeral (DH) implants. METHODS: Seven reverse-engineered DH implants were manufactured based on computed tomography scans of their osseous geometry. Native ulnae were paired with corresponding native humeri and custom DH implants in a loading apparatus. The ulna was set at 90° of flexion and the humeral component (either native bone or reverse-engineered implant) was positioned from 5° varus to 5° valgus in 2...
April 25, 2017: Journal of Hand Surgery
https://www.readbyqxmd.com/read/28425096/influence-of-coral-cover-and-structural-complexity-on-the-accuracy-of-visual-surveys-of-coral-reef-fish-communities
#4
D J Coker, J P Nowicki, N A J Graham
Using manipulated patch reefs with combinations of varying live-coral cover (low, medium and high) and structural complexity (low and high), common community metrics (abundance, diversity, richness and community composition) collected through standard underwater visual census techniques were compared with exhaustive collections using a fish anaesthetic (clove oil). This study showed that reef condition did not influence underwater visual census estimates at a community level, but reef condition can influence the detectability of some small and cryptic species and this may be exacerbated if surveys are conducted on a larger scale...
April 19, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28423052/inflammation-induced-fetal-growth-restriction-in-rats-is-associated-with-increased-placental-hif-1%C3%AE-accumulation
#5
Kevin P Robb, Tiziana Cotechini, Camille Allaire, Arissa Sperou, Charles H Graham
INTRODUCTION: Hypoxia-inducible factor 1-alpha (HIF-1α) is the oxygen-sensitive subunit of the transcription factor HIF-1, and its expression is increased in placentas from pregnancies complicated by pre-eclampsia (PE). Fetal growth restriction (FGR) and PE often share a common pathophysiology; however, it is unknown whether increased placental HIF-1α occurs in FGR. We previously demonstrated that aberrant maternal inflammation in rats resulted in altered utero-placental perfusion and FGR, both of which were prevented by administration of the nitric oxide mimetic glyceryl trinitrate (GTN)...
2017: PloS One
https://www.readbyqxmd.com/read/28396143/lethal-effects-of-an-insecticidal-spider-venom-peptide-involve-positive-allosteric-modulation-of-insect-nicotinic-acetylcholine-receptors
#6
Monique J Windley, Irina Vetter, Richard J Lewis, Graham M Nicholson
κ-Hexatoxins (κ-HXTXs) are a family of excitotoxic insect-selective neurotoxins from Australian funnel-web spiders that are lethal to a wide range of insects, but display no toxicity towards vertebrates. The prototypic κ-HXTX-Hv1c selectively blocks native and expressed cockroach large-conductance calcium-activated potassium (BKCa or KCa1.1) channels, but not their mammalian orthologs. Despite this potent and selective action on insect KCa1.1 channels, we found that the classical KCa1.1 blockers paxilline, charybdotoxin and iberiotoxin, which all block insect KCa1...
April 8, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28169515/fabrication-of-patterned-superhydrophobic-hydrophilic-substrates-by-laser-micromachining-for-small-volume-deposition-and-droplet-based-fluorescence
#7
K J Bachus, L Mats, H W Choi, G T T Gibson, R D Oleschuk
The deposition of nanoliter and subnanoliter volumes is important in chemical and biochemical droplet-based microfluidic systems. There are several techniques that have been established for the deposition/generation of small volumes including the use of surfaces with patterned differences in wettability. Many such methods require complex and time-consuming lithographic techniques. Here, we present a facile method for the fabrication of superhydrophobic surfaces with patterned hydrophilic regions by laser micromachining...
March 1, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28067894/unexpected-uvr-and-non-uvr-mutation-burden-in-some-acral-and-cutaneous-melanomas
#8
Robert V Rawson, Peter A Johansson, Nicholas K Hayward, Nicola Waddell, Ann-Marie Patch, Serigne Lo, John V Pearson, John F Thompson, Graham J Mann, Richard A Scolyer, James S Wilmott
Ultraviolet radiation (UVR) mutagenesis causes nearly all cutaneous melanomas, however, since UVR signatures are largely absent in acral melanoma, as well as melanoma in sun-protected sites, the cause of these melanomas is unknown. Whole-genome sequencing data generated as part of the Australian Melanoma Genome Project was supplemented with a detailed histopathological assessment with the melanomas then classified as UVR or non-UVR related, based on their mutation signatures. The clinicopathological characteristics of melanomas with mutation signatures for their subtype were compared...
February 2017: Laboratory Investigation; a Journal of Technical Methods and Pathology
https://www.readbyqxmd.com/read/28048962/chemical-ecology-of-wave-swept-shores-the-primacy-of-contact-cues-in-predation-by-whelks
#9
Graham A Ferrier, Cheryl Ann Zimmer, Richard K Zimmer
Wave-swept shores are valuable for developing and testing key ecological principles. A synthesis of research is nonetheless missing a critical component: the chemosensory basis for behavioral interactions that determine population- and community-wide attributes. Chemical signaling environments on wave-swept shores, given their intense, turbulent mixing and complex topographies, would be difficult or impossible to simulate in a laboratory setting. For this reason, appropriately scaled field studies are needed to advance understanding of chemical stimuli and their biotic effects...
December 2016: Biological Bulletin
https://www.readbyqxmd.com/read/28024649/management-strategy-for-patients-with-chronic-subclavian-vein-thrombosis
#10
REVIEW
Graham Keir, M Blair Marshall
We performed a systematic review to determine best practice for the management of patients with chronic or subacute subclavian vein thrombosis. This condition is best managed with surgical excision of the first rib followed by long-term anticoagulation. Interventional techniques aimed at restoring patency are ineffective beyond 2 weeks postthrombosis. Additional therapeutic options should be made based on the severity of symptoms as well as vein status. Patients with milder symptoms are given decompression surgery followed by anticoagulation whereas patients with more severe symptoms are considered for either a jugular vein transposition or saphenous patch based on the vein characteristics...
February 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28024115/mutation-load-in-melanoma-is-affected-by-mc1r-genotype
#11
Peter A Johansson, Antonia L Pritchard, Ann-Marie Patch, James S Wilmott, John V Pearson, Nicola Waddell, Richard A Scolyer, Graham J Mann, Nicholas K Hayward
Whole-genome sequencing of matched germline and tumour pairs in a well-characterized cohort of melanoma patients allowed investigation of associations between melanoma body site, age at melanoma onset and MC1R variant status with overall mutation burden and specific base pair changes observed in the corresponding melanoma. We observed statistically significant associations between mutation burden in melanoma and body site, age at onset and MC1R genotype, for both ultraviolet radiation (UVR) signature changes (C>T and CC>TT) and non-UVR base pair substitutions, as well as with overall variant load...
March 2017: Pigment Cell & Melanoma Research
https://www.readbyqxmd.com/read/27896884/contact-allergy-to-preservatives-essca-results-with-the-baseline-series-2009-2012
#12
A M Giménez-Arnau, G Deza, A Bauer, G A Johnston, V Mahler, M-L Schuttelaar, J Sanchez-Perez, J F Silvestre, M Wilkinson, W Uter
BACKGROUND: Allergic contact dermatitis caused by biocides is common and causes significant patient morbidity. OBJECTIVE: To describe the current frequency and pattern of patch test reactivity to biocide allergens included in the baseline series of most European countries. METHODS: Data collected by the European Surveillance System on Contact Allergies (ESSCA) network between 2009 and 2012 from 12 European countries were analysed. RESULTS: Methylisothiazolinone 0...
April 2017: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/27856273/hypermutation-in-pancreatic-cancer
#13
Jeremy L Humphris, Ann-Marie Patch, Katia Nones, Peter J Bailey, Amber L Johns, Skye McKay, David K Chang, David K Miller, Marina Pajic, Karin S Kassahn, Michael C J Quinn, Timothy J C Bruxner, Angelika N Christ, Ivon Harliwong, Senel Idrisoglu, Suzanne Manning, Craig Nourse, Ehsan Nourbakhsh, Andrew Stone, Peter J Wilson, Matthew Anderson, J Lynn Fink, Oliver Holmes, Stephen Kazakoff, Conrad Leonard, Felicity Newell, Nick Waddell, Scott Wood, Ronald S Mead, Qinying Xu, Jianmin Wu, Mark Pinese, Mark J Cowley, Marc D Jones, Adnan M Nagrial, Venessa T Chin, Lorraine A Chantrill, Amanda Mawson, Angela Chou, Christopher J Scarlett, Andreia V Pinho, Ilse Rooman, Marc Giry-Laterriere, Jaswinder S Samra, James G Kench, Neil D Merrett, Christopher W Toon, Krishna Epari, Nam Q Nguyen, Andrew Barbour, Nikolajs Zeps, Nigel B Jamieson, Colin J McKay, C Ross Carter, Euan J Dickson, Janet S Graham, Fraser Duthie, Karin Oien, Jane Hair, Jennifer P Morton, Owen J Sansom, Robert Grützmann, Ralph H Hruban, Anirban Maitra, Christine A Iacobuzio-Donahue, Richard D Schulick, Christopher L Wolfgang, Richard A Morgan, Rita T Lawlor, Borislav Rusev, Vincenzo Corbo, Roberto Salvia, Ivana Cataldo, Giampaolo Tortora, Margaret A Tempero, Oliver Hofmann, James R Eshleman, Christian Pilarsky, Aldo Scarpa, Elizabeth A Musgrove, Anthony J Gill, John V Pearson, Sean M Grimmond, Nicola Waddell, Andrew V Biankin
Pancreatic cancer is molecularly diverse, with few effective therapies. Increased mutation burden and defective DNA repair are associated with response to immune checkpoint inhibitors in several other cancer types. We interrogated 385 pancreatic cancer genomes to define hypermutation and its causes. Mutational signatures inferring defects in DNA repair were enriched in those with the highest mutation burdens. Mismatch repair deficiency was identified in 1% of tumors harboring different mechanisms of somatic inactivation of MLH1 and MSH2...
January 2017: Gastroenterology
https://www.readbyqxmd.com/read/27806000/roscoe-r-graham-an-enduring-legacy-in-the-21st-century
#14
Alexandra C Istl, Daryl K Gray
BACKGROUND: Modern advancements in surgery have led to a climate in which many classical techniques are becoming obsolete. However, the Graham patch technique for duodenal repair continues to be widely used as originally described in Dr Roscoe Reid Graham's 1937 article: an omental graft held in position over a duodenal perforation by three interrupted sutures. METHODS: Primary documents including original newspaper articles and wartime documents were retrieved from the University of Toronto Archives and Records...
January 2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/27787926/a-cross-continental-comparison-of-plant-and-beetle-responses-to-retention-of-forest-patches-during-timber-harvest
#15
Susan C Baker, Charles B Halpern, Timothy J Wardlaw, Christel Kern, Graham J Edgar, Russell J Thomson, Richard E Bigley, Jerry F Franklin, Kamal J K Gandhi, Lena Gustafsson, Samuel Johnson, Brian J Palik, Thomas A Spies, E Ashley Steel, Jan Weslien, Joachim Strengbom
Timber harvest can adversely affect forest biota. Recent research and application suggest that retention of mature forest elements (retention forestry), including unharvested patches (or aggregates) within larger harvested units, can benefit biodiversity compared to clearcutting. However, it is unclear whether these benefits can be generalized among the diverse taxa and biomes in which retention forestry is practiced. Lack of comparability in methods for sampling and analyzing responses to timber harvest and edge creation presents a challenge to synthesis...
December 2016: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/27784066/trpv2-channels-contribute-to-stretch-activated-cation-currents-and-myogenic-constriction-in-retinal-arterioles
#16
Mary K McGahon, José A Fernández, Durga P Dash, Jon McKee, David A Simpson, Alex V Zholos, J Graham McGeown, Tim M Curtis
Purpose: Activation of the transient receptor potential channels, TRPC6, TRPM4, and TRPP1 (PKD2), has been shown to contribute to the myogenic constriction of cerebral arteries. In the present study we sought to determine the potential role of various mechanosensitive TRP channels to myogenic signaling in arterioles of the rat retina. Methods: Rat retinal arterioles were isolated for RT-PCR, Fura-2 Ca2+ microfluorimetry, patch-clamp electrophysiology, and pressure myography studies...
October 1, 2016: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/27643975/effect-of-fish-oil-on-lateral-mobility-of-prostaglandin-f2%C3%AE-fp-receptors-and-spatial-distribution-of-lipid-microdomains-in-bovine-luteal-cell-plasma-membrane-in%C3%A2-vitro
#17
M R Plewes, P D Burns, P E Graham, R M Hyslop, B G Barisas
Lipid microdomains are ordered regions on the plasma membrane of cells, rich in cholesterol and sphingolipids, ranging in size from 10 to 200 nm in diameter. These lipid-ordered domains may serve as platforms to facilitate colocalization of intracellular signaling proteins during agonist-induced signal transduction. It is hypothesized that fish oil will disrupt the lipid microdomains, increasing spatial distribution of these lipid-ordered domains and lateral mobility of the prostaglandin (PG) F2α (FP) receptors in bovine luteal cells...
January 2017: Domestic Animal Endocrinology
https://www.readbyqxmd.com/read/27520396/ephenidine-a-new-psychoactive-agent-with-ketamine-like-nmda-receptor-antagonist-properties
#18
Heather Kang, Pojeong Park, Zuner A Bortolotto, Simon D Brandt, Tristan Colestock, Jason Wallach, Graham L Collingridge, David Lodge
To avoid legislation based on chemical structure, research chemicals, frequently used for recreational purposes, are continually being synthesized. N-Ethyl-1,2-diphenylethanamine (ephenidine) is a diarylethylamine that has recently become popular with recreational users searching for dissociative hallucinogenic effects. In the present study, the pharmacological basis of its neural actions has been investigated, initially by assessing its profile in central nervous system receptor binding assays and subsequently in targeted electrophysiological studies...
January 2017: Neuropharmacology
https://www.readbyqxmd.com/read/27435841/gastric-perforation-secondary-to-metastasis-from-breast-cancer
#19
Chee Siong Wong, Ashutosh Gumber, Pasupathy Kiruparan, Alexander Blackmore
Gastric perforation secondary to metastasis from breast cancer occurs infrequently. We present the case of a 72-year-old postmenopausal female patient with a known history of lobular carcinoma of the breast who presented to a district general hospital with a clinical diagnosis of an acute abdomen. Further contrast-enhanced CT scan demonstrated free gas and fluid in the abdomen. She underwent emergency exploratory laparotomy and onlay Graham's omentopexy patch due to 1×1 cm prepyloric gastric perforation...
July 18, 2016: BMJ Case Reports
https://www.readbyqxmd.com/read/27387191/unusual-side-effect-of-cannabis-use-acute-abdomen-due-to-duodenal-perforation
#20
Sevgi Buyukbese Sarsu
BACKGROUND: The chronic use of synthetic cannabinoids (SCs) which has become an increasingly prevalent problem can rarely cause gastric and duodenal ulcer because of their effects on gastric secretion and emptying. Since peptic ulcer disease (PUD) is a rarely seen entity in patients who consult to the emergency service with complaints of abdominal pain, most of the physicians do not suspect of this clinical diagnosis. Perforation is a mortal complication of PUD, and early diagnosis and emergency surgery are life-saving procedures...
December 2016: International Journal of Emergency Medicine
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