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https://www.readbyqxmd.com/read/29220405/maaqwi-cascadensis-a-large-marine-diving-bird-avialae-ornithurae-from-the-upper-cretaceous-of-british-columbia-canada
#1
Sandy M S McLachlan, Gary W Kaiser, Nicholas R Longrich
Mesozoic bird fossils from the Pacific Coast of North America are rare, but small numbers are known from the Late Cretaceous aged sediments of Hornby Island, British Columbia. Most are unassociated fragments that offer little information, but additional preparation of a large coracoid has revealed more details of its structure, as well as three associated wing bones. Phylogenetic analysis suggests that Maaqwi cascadensis, gen. et sp. nov. represents a derived crown or near-crown member of Ornithurae, and specifically suggests affinities with Vegaviidae...
2017: PloS One
https://www.readbyqxmd.com/read/29220368/increased-sediment-load-during-a-large-scale-dam-removal-changes-nearshore-subtidal-communities
#2
Stephen P Rubin, Ian M Miller, Melissa M Foley, Helen D Berry, Jeffrey J Duda, Benjamin Hudson, Nancy E Elder, Matthew M Beirne, Jonathan A Warrick, Michael L McHenry, Andrew W Stevens, Emily F Eidam, Andrea S Ogston, Guy Gelfenbaum, Rob Pedersen
The coastal marine ecosystem near the Elwha River was altered by a massive sediment influx-over 10 million tonnes-during the staged three-year removal of two hydropower dams. We used time series of bathymetry, substrate grain size, remotely sensed turbidity, scuba dive surveys, and towed video observations collected before and during dam removal to assess responses of the nearshore subtidal community (3 m to 17 m depth). Biological changes were primarily driven by sediment deposition and elevated suspended sediment concentrations...
2017: PloS One
https://www.readbyqxmd.com/read/29217577/paradoxical-escape-responses-by-narwhals-monodon-monoceros
#3
Terrie M Williams, Susanna B Blackwell, Beau Richter, Mikkel-Holger S Sinding, Mads Peter Heide-Jørgensen
Until recent declines in Arctic sea ice levels, narwhals (Monodon monoceros) have lived in relative isolation from human perturbation and sustained predation pressures. The resulting naïvety has made this cryptic, deep-diving cetacean highly susceptible to disturbance, although quantifiable effects have been lacking. We deployed a submersible, animal-borne electrocardiograph-accelerometer-depth recorder to monitor physiological and behavioral responses of East Greenland narwhals after release from net entanglement and stranding...
December 8, 2017: Science
https://www.readbyqxmd.com/read/29214659/2d-speckle-tracking-echocardiography-of-the-right-ventricle-free-wall-in-scuba-divers-after-single-open-sea-dive
#4
Zora Susilovic-Grabovac, Ante Obad, Darko Duplančić, Ivana Banić, Denise Brusoni, Piergiuseppe Agostoni, Ivica Vuković, Zeljko Dujic, Darija Bakovic
The presence of circulating gas bubbles and their influence on pulmonary and right heart hemodynamics was reported after uncomplicated self-contained underwater breathing apparatus (SCUBA) dive(s). Improvements in cardiac imaging have recently focused great attention on the right ventricle (RV). The aim of our study was to evaluate possible effects of a single air SCUBA dive on RV function using 2D speckle tracking echocardiography in healthy divers after single open sea dive to 18 meters of seawater, followed by bottom stay of 47 minutes with a direct ascent to the surface...
December 7, 2017: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/29214043/folic-acid-level-and-preterm-birth-among-sudanese-women
#5
Manal E Sharif, Ahmed Mohamedain, AbdelBagi A Ahmed, Abubakr M Nasr, Ishag Adam
Background: Preterm birth (PTB) is the major health problem world-wide; there are few published studies on PTB and folic acid. Methods: The study was conducted to assess the serum level of folic acid in PTB. A case-control study was conducted at Saad Abualila maternity hospital (Khartoum, Sudan) during the period of March through December 2015. Women who delivered live singleton babies were dived in two groups; the cases were women who had PTB "delivery before completed 37weeks but after 24 weeks of pregnancy" and the controls were women who delivered at term (37-42 weeks)...
2017: Maternal Health, Neonatology and Perinatology
https://www.readbyqxmd.com/read/29212841/hyperbaric-oxygen-pretreatment-benefits-on-decompression-sickness-in-bama-pigs
#6
Long Qing, Hong-Jie Yi, Ye-Wei Wang, Quan Zhou, Dinesh K Ariyadewa, Wei-Gang Xu
Decompression sickness (DCS) occurs when ambient pressure severely reduces during diving and aviation. Hyperbaric oxygen (HBO) pretreatment has been proven to exert beneficial effects on DCS in rats via heat-shock proteins (HSPs). We hypothesize that HBO pretreatment will also reduce DCS via HSPs in swine models. In part 1, six swine were subjected to a session of HBO treatment. HSP 32, 60, 70 and 90 were detected, before and at 6, 12, 18, 24 and 30 h following exposure in lymphocytes. In part 2, another ten swine were randomly assigned into 2 groups, 5 in each...
December 6, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/29211797/hooded-seal-cystophora-cristata-foraging-areas-in-the-northeast-atlantic-ocean-investigated-using-three-complementary-methods
#7
Jade Vacquie-Garcia, Christian Lydersen, Martin Biuw, Tore Haug, Mike A Fedak, Kit M Kovacs
Identifying environmental characteristics that define the ecological niche of a species is essential to understanding how changes in physical conditions might affect its distribution and other aspects of its ecology. The present study used satellite relay data loggers (SRDLs) to study habitat use by Northeast Atlantic hooded seals (N = 20; 9 adult females, 3 adult males, and 8 juveniles). Three different methods were used in combination to achieve maximum insight regarding key foraging areas for hooded seals in this region, which have decline by 85% in recent decades: 1) first passage time (FPT); 2) vertical transit rate and; 3) change in dive drift rate...
2017: PloS One
https://www.readbyqxmd.com/read/29209284/the-sit-and-wait-hypothesis-in-bacterial-pathogens-a-theoretical-study-of-durability-and-virulence
#8
Liang Wang, Zhanzhong Liu, Shiyun Dai, Jiawei Yan, Michael J Wise
The intriguing sit-and-wait hypothesis predicts that bacterial durability in the external environment is positively correlated with their virulence. Since its first proposal in 1987, the hypothesis has been spurring debates in terms of its validity in the field of bacterial virulence. As a special case of the vector-borne transmission versus virulence tradeoff, where vector is now replaced by environmental longevity, there are only sporadic studies over the last three decades showing that environmental durability is possibly linked with virulence...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29198445/a-deep-dive-into-the-left-ventricle
#9
EDITORIAL
Hiroo Takayama, Shepard D Weiner, Emile A Bacha
No abstract text is available yet for this article.
November 16, 2017: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29195807/parallel-evaluation-of-circulating-tumor-dna-and-circulating-tumor-cells-in-metastatic-colorectal-cancer
#10
Giovanni Germano, Gianluca Mauri, Giulia Siravegna, Caroline Dive, Jackie Pierce, Federica Di Nicolantonio, Maurizio D'Incalci, Alberto Bardelli, Salvatore Siena, Andrea Sartore-Bianchi
BACKGROUND: Tissue biopsy is the gold standard for tumor genotyping, but it is an invasive procedure providing a single snapshot into tumor heterogeneity. Liquid biopsy approaches, encompassing the analysis of circulating tumor DNA (ctDNA) or circulating tumor cells (CTCs), have been proposed as an alternative, with the potential of providing a comprehensive portrait of the tumor molecular landscape. In metastatic colorectal cancer (mCRC), both CTCs and ctDNA analysis have been investigated, but comparative analyses are limited...
November 1, 2017: Clinical Colorectal Cancer
https://www.readbyqxmd.com/read/29193571/the-heart-failure-readmission-quagmire-taking-a-deep-dive-to-find-solutions
#11
EDITORIAL
Rohan Khera, Ambarish Pandey
No abstract text is available yet for this article.
November 30, 2017: European Journal of Heart Failure
https://www.readbyqxmd.com/read/29189966/management-of-adverse-renal-events-related-to-alemtuzumab-treatment-in-multiple-sclerosis-a-belgian-consensus
#12
Ben Sprangers, D Decoo, D Dive, A Lysandropoulos, L Vanopdenbosch, C Bovy
Alemtuzumab is a humanized monoclonal antibody indicated for the treatment of adult patients with relapsing-remitting multiple sclerosis with active disease. Multiple sclerosis (MS) patients treated with alemtuzumab are at increased risk for autoimmune adverse events (thyroid disorders, immune thrombocytopenia, and renal disease). The use of alemtuzumab has been associated with the development of renal immune-mediated adverse events in 0.3% of patients in clinical trials in MS, which generally occurred within 39 months of the last administration...
November 30, 2017: Acta Neurologica Belgica
https://www.readbyqxmd.com/read/29186227/-snorkelling-vs-diving-in-mixed-micelles-probed-by-means-of-a-molecular-bathymeter
#13
Gemma M Rodriguez-Muñiz, Miguel Gomez-Mendoza, Edurne Nuin, Inmaculada Andreu, M Luisa Marin, Miguel A Miranda
A photoactive bathymeter based on a carboxylic acid moiety covalently linked to a signalling methoxynaphthalene (MNP) fluorophore has been designed to prove the concept of "snorkelling" vs. "diving" in mixed micelles (MM). The carboxylic acid "floats" on the MM surface, while the MNP unit sinks deep in MM. The rate constants of MNP fluorescence quenching by iodide, which remains basically in water, consistently decrease with increasing spacer length, revealing different regions. This is associated with the distance MNP should "dive" in MM to achieve protection from aqueous reactants...
November 29, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/29183666/microembolism-of-single-cortical-arterioles-can-induce-spreading-depression-and-ischemic-injury-a-potential-trigger-for-migraine-and-related-mri-lesions
#14
REVIEW
Buket Dönmez-Demir, Muge Yemisci, Kıvılcım Kılıç, Yasemin Gürsoy-Özdemir, Figen Söylemezoğlu, Michael Moskowitz, Turgay Dalkara
Increasing epidemiological evidence suggests an association between migraine with aura (MA) and cardiovascular events. There is experimental as well as clinical evidence implying cerebral microembolism as a potential trigger for MA attacks. Microembolism may also account for some of the ischemic MRI lesions more commonly observed in MA than in general population. Limited size of clinically-silent MRI lesions suggests isolated occlusion of a small vessel. However, it is not known whether selective thrombosis of a small arteriole (e...
November 25, 2017: Brain Research
https://www.readbyqxmd.com/read/29181341/odontoideum-bone-revealed-by-c1-c2-dislocation-of-the-cervical-spine-during-a-diving-accident
#15
Lassaad Hassini, Mohamed Ali Khalifa, Zeineb Alaya, Mohamed Laaziz Ben Ayeche, Walid Osman, Mourad Mtaoumi
Introduction: Odontoideum bone or the mobile odontoid process is one of the rarest malformations of the cervico-occipital hinge. It exposes to the atlo-axial instability and to the risk of bulbo-medullary compression threatening then the vital and functional prognosis. We report the case of a 16-year-old patient who was the victim of a raod accident resulting in acervical spine injury. Radiological investigation found an odontoideum bone malformation associated with C1C2 dislocation. Case Report: A 16-year-old patient with no medical history had a road accident...
July 2017: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/29178494/microvascular-characteristics-of-the-acoustic-fats-novel-data-suggesting-taxonomic-differences-between-deep-and-shallow-diving-odontocetes
#16
Molly K Gabler, D Mark Gay, Andrew J Westgate, Heather N Koopman
Odontocetes have specialized mandibular fats, the extramandibular (EMFB) and intramandibular fat bodies (IMFB), which function as acoustic organs, receiving and channeling sound to the ear during hearing and echolocation. Recent strandings of beaked whales suggest that these fat bodies are susceptible to nitrogen (N2 ) gas embolism and empirical evidence has shown that the N2 solubility of these fat bodies is higher than that of blubber. Since N2 gas will diffuse from blood into tissue at any blood/tissue interface and potentially form gas bubbles upon decompression, it is imperative to understand the extent of microvascularity in these specialized acoustic fats so that risk of embolism formation when diving can be estimated...
November 27, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/29176479/effect-of-long-term-diving-on-the-morphology-and-growth-of-the-distal-radial-epiphyseal-plate-of-young-divers-a-magnetic-resonance-imaging-study
#17
Cici Zhang, Si Shen, Wen Zhang, Lin Qiu, Qingying Wu, Fei Wang, Sirun Liu
OBJECTIVE: To investigate the effects of long-term diving on the morphology and growth of the distal radial epiphyseal plate in young divers. STUDY DESIGN: Cohort study. SETTING: Guangzhou Sport University. PARTICIPANTS: Thirty-eight professional divers, aged 10 to 17 years, and 25 age-matched volunteers. INTERVENTIONS: Each subject received a physical examination at the beginning of the study and underwent bilateral magnetic resonance imaging of the wrist...
November 13, 2017: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/29175087/iso-risk-air-no-decompression-limits-after-scoring-marginal-decompression-sickness-cases-as-non-events
#18
F Gregory Murphy, Ashleigh J Swingler, Wayne A Gerth, Laurens E Howle
Decompression sickness (DCS) in humans is associated with reductions in ambient pressure that occur during diving, aviation, or certain manned spaceflight operations. Its signs and symptoms can include, but are not limited to, joint pain, radiating abdominal pain, paresthesia, dyspnea, general malaise, cognitive dysfunction, cardiopulmonary dysfunction, and death. Probabilistic models of DCS allow the probability of DCS incidence and time of occurrence during or after a given hyperbaric or hypobaric exposure to be predicted based on how the gas contents or gas bubble volumes vary in hypothetical tissue compartments during the exposure...
November 15, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/29173760/targeting-dna-damage-in-sclc
#19
REVIEW
Victoria Foy, Maximilian W Schenk, Katie Baker, Fabio Gomes, Alice Lallo, Kristopher K Frese, Martin Forster, Caroline Dive, Fiona Blackhall
SCLC accounts for 15% of lung cancer worldwide. Characterised by early dissemination and rapid development of chemo-resistant disease, less than 5% of patients survive 5 years. Despite 3 decades of clinical trials there has been no change to the standard platinum and etoposide regimen for first line treatment developed in the 1970's. The exceptionally high number of genomic aberrations observed in SCLC combined with the characteristic rapid cellular proliferation results in accumulation of DNA damage and genomic instability...
December 2017: Lung Cancer: Journal of the International Association for the Study of Lung Cancer
https://www.readbyqxmd.com/read/29167596/vocal-foragers-and-silent-crowds-context-dependent-vocal-variation-in-northeast-atlantic-long-finned-pilot-whales
#20
Fleur Visser, Annebelle C M Kok, Machiel G Oudejans, Lindesay A S Scott-Hayward, Stacy L DeRuiter, Ana C Alves, Ricardo N Antunes, Saana Isojunno, Graham J Pierce, Hans Slabbekoorn, Jef Huisman, Patrick J O Miller
Abstract: Vocalisations form a key component of the social interactions and foraging behaviour of toothed whales. We investigated changes in calling and echolocation behaviour of long-finned pilot whales between foraging and non-foraging periods, by combining acoustic recordings and diving depth data from tagged individuals with concurrent surface observations on social behaviour of their group. The pilot whales showed marked vocal variation, specific to foraging and social context. During periods of foraging, pilot whales showed more vocal activity than during non-foraging periods (rest, travel)...
2017: Behavioral Ecology and Sociobiology
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