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https://www.readbyqxmd.com/read/28992601/tooth-damage-in-captive-orcas-orcinus-orca
#1
John Jett, Ingrid N Visser, Jeffrey Ventre, Jordan Waltz, Carolina Loch
OBJECTIVES: Tooth damage as a result of oral stereotypies is evident in captive orca, yet little research on the topic exists. This study examines the associations between dental pathology, sex, facility, duration of captivity and other factors in captive orca. DESIGN: We evaluated mandibular and maxillary teeth from dental images of 29 captive orca owned by a US-based theme park. Each tooth was scored for coronal wear, wear at or below gum line and bore holes. Fractured and missing teeth were also noted...
September 29, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28970809/the-role-of-spatial-frequency-information-in-face-classification-by-race
#2
Guoping Zhang, Zeyao Wang, Jie Wu, Lun Zhao
It was found that face classification by race is more quickly for other-race than own-race faces (other-race classification advantage, ORCA). Controlling the spatial frequencies of face images, the current study investigated the perceptual processing differences based on spatial frequencies between own-race and other-race faces that might account for the ORCA. Regardless of the races of the observers, the own-race faces were classified faster and more accurately for broad-band faces than for both lower and higher spatial frequency (SF) faces, whereas, although other-race faces were classified less accurately for higher SF than for either broad-band or lower SF faces, there was no difference between broad-band and lower SF conditions of other-race faces...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28883537/spontaneous-approaches-of-divers-by-free-ranging-orcas-orcinus-orca-age-and-sex-differences-in-exploratory-behaviours-and-visual-laterality
#3
Stéphanie Chanvallon, Catherine Blois-Heulin, Pierre Robert de Latour, Alban Lemasson
Running comparative studies of laterality in mammals is a way to deepen our understanding of the evolution of the brain hemisphere functions. Studies on vision highlighted a possible task-sharing between hemispheres depending on the characteristics of the observers, the nature of the observed stimulus and the context of the observation, a phenomenon that could go beyond the monitoring of conspecifics. Cetaceans are predators that adapted to an aquatic habitat and display a clear crossing of fibers to the side of the brain opposite the eye of origin...
September 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28876915/effects-of-polar-bear-and-killer-whale-derived-contaminant-cocktails-on-marine-mammal-immunity
#4
Jean-Pierre Desforges, Milton Levin, Lindsay Jasperse, Sylvain De Guise, Igor Eulaers, Robert J Letcher, Mario Acquarone, Erling Nordøy, Lars P Folkow, Trine Hammer Jensen, Carsten Grøndahl, Mads F Bertelsen, Judy St Leger, Javier Almunia, Christian Sonne, Rune Dietz
Most controlled toxicity studies use single chemical exposures that do not represent the real world situation of complex mixtures of known and unknown natural and anthropogenic substances. In the present study, complex contaminant cocktails derived from the blubber of polar bears (PB; Ursus maritimus) and killer whales (KW; Orcinus orca) were used for in vitro concentration-response experiments with PB, cetacean and seal spp. immune cells to evaluate the effect of realistic contaminant mixtures on various immune functions...
September 25, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28776023/nitroxide-based-macromolecular-contrast-agents-with-unprecedented-transverse-relaxivity-and-stability-for-magnetic-resonance-imaging-of-tumors
#5
Hung V-T Nguyen, Qixian Chen, Joseph T Paletta, Peter Harvey, Yivan Jiang, Hui Zhang, Michael D Boska, M Francesca Ottaviani, Alan Jasanoff, Andrzej Rajca, Jeremiah A Johnson
Metal-free magnetic resonance imaging (MRI) agents could overcome the established toxicity associated with metal-based agents in some patient populations and enable new modes of functional MRI in vivo. Herein, we report nitroxide-functionalized brush-arm star polymer organic radical contrast agents (BASP-ORCAs) that overcome the low contrast and poor in vivo stability associated with nitroxide-based MRI contrast agents. As a consequence of their unique nanoarchitectures, BASP-ORCAs possess per-nitroxide transverse relaxivities up to ∼44-fold greater than common nitroxides, exceptional stability in highly reducing environments, and low toxicity...
July 26, 2017: ACS Central Science
https://www.readbyqxmd.com/read/28767655/beluga-whale-summer-habitat-associations-in-the-nelson-river-estuary-western-hudson-bay-canada
#6
Alexander J Smith, Jeff W Higdon, Pierre Richard, Jack Orr, Warren Bernhardt, Steven H Ferguson
To understand beluga whale (Delphinapterus leucas) estuarine use in the Nelson River estuary, southwest Hudson Bay, we recorded and examined beluga movements and habitat associations for the July through August period in 2002-2005. We compared locations of belugas fitted with satellite transmitters ("tags") (2002-2005) and aerial-surveyed (2003 and 2005) belugas for years of differing freshwater flow from the Nelson River which is influenced by hydroelectric activity. Using the beluga telemetry location data, we estimated an early August behavioral shift in beluga distribution patterns from local estuarine use to a progressively more migratory behavior away from the estuary...
2017: PloS One
https://www.readbyqxmd.com/read/28695252/oil-spills-and-marine-mammals-in-british-columbia-canada-development-and-application-of-a-risk-based-conceptual-framework
#7
Adrianne L Jarvela Rosenberger, Misty MacDuffee, Andrew G J Rosenberger, Peter S Ross
Marine mammals are inherently vulnerable to oil spills. We developed a conceptual framework to evaluate the impacts of potential oil exposure on marine mammals and applied it to 21 species inhabiting coastal British Columbia (BC), Canada. Oil spill vulnerability was determined by examining both the likelihood of species-specific (individual) oil exposure and the consequent likelihood of population-level effects. Oil exposure pathways, ecology, and physiological characteristics were first used to assign species-specific vulnerability rankings...
July 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28691111/density-functional-calculations-for-prediction-of-57-fe-m%C3%A3-ssbauer-isomer-shifts-and-quadrupole-splittings-in-%C3%AE-diketiminate-complexes
#8
Sean F McWilliams, Emma Brennan-Wydra, K Cory MacLeod, Patrick L Holland
The relative ease of Mössbauer spectroscopy and of density functional theory (DFT) calculations encourages the use of Mössbauer parameters as a validation method for calculations, and the use of calculations as a double check on crystallographic structures. A number of studies have proposed correlations between the computationally determined electron density at the iron nucleus and the observed isomer shift, but deviations from these correlations in low-valent iron β-diketiminate complexes encouraged us to determine a new correlation for these compounds...
June 30, 2017: ACS Omega
https://www.readbyqxmd.com/read/28666015/first-longitudinal-study-of-seal-feeding-killer-whales-orcinus-orca-in-norwegian-coastal-waters
#9
Eve Jourdain, Dag Vongraven, Anna Bisther, Richard Karoliussen
Killer whales (Orcinus orca) have been documented preying on either fish or marine mammals in several regions, suggesting that this odontocete species has the ability to specialize on different types of prey. Off Norway, killer whales have been shown to rely on the Atlantic herring (Clupea harengus) as a main prey resource. Infrequent observations have revealed seals as an additional component of their diet, yet the extent of predation on marine mammals has remained largely unknown. Here, we present the findings of 29 years of photographic and observational data on seal-feeding killer whale groups identified in Norwegian coastal waters...
2017: PloS One
https://www.readbyqxmd.com/read/28662095/population-growth-is-limited-by-nutritional-impacts-on-pregnancy-success-in-endangered-southern-resident-killer-whales-orcinus-orca
#10
Samuel K Wasser, Jessica I Lundin, Katherine Ayres, Elizabeth Seely, Deborah Giles, Kenneth Balcomb, Jennifer Hempelmann, Kim Parsons, Rebecca Booth
The Southern Resident killer whale population (Orcinus orca) was listed as endangered in 2005 and shows little sign of recovery. These fish eating whales feed primarily on endangered Chinook salmon. Population growth is constrained by low offspring production for the number of reproductive females in the population. Lack of prey, increased toxins and vessel disturbance have been listed as potential causes of the whale's decline, but partitioning these pressures has been difficult. We validated and applied temporal measures of progesterone and testosterone metabolites to assess occurrence, stage and health of pregnancy from genotyped killer whale feces collected using detection dogs...
2017: PloS One
https://www.readbyqxmd.com/read/28636165/a-feasibility-and-safety-study-of-intracoronary-hemodilution-during-primary-coronary-angioplasty-in-order-to-reduce-reperfusion-injury-in-myocardial-infarction
#11
Michael McGarvey, Omar Ali, M Bilal Iqbal, Charles Ilsley, Joyce Wong, Carlo Di Mario, Simon Redwood, Tiffany Patterson, Dudley J Pennell, Paula Rogers, Miles Dalby
OBJECTIVES: We designed a pilot study to evaluate safety and feasibility of an inexpensive and simple approach to intracoronary hemodilution during primary angioplasty (PPCI) to reduce reperfusion injury. INTRODUCTION: Early revascularization in acute myocardial infarction decreases infarct size and improves outcomes. However, abrupt restoration of coronary flow results in myocardial reperfusion injury and increased final infarct size. Dilution of coronary blood during revascularization may help reduce this damage...
June 21, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28608423/a-toolchain-for-the-automatic-generation-of-computer-codes-for-correlated-wavefunction-calculations
#12
Martin Krupička, Kantharuban Sivalingam, Lee Huntington, Alexander A Auer, Frank Neese
In this work, the automated generator environment for ORCA (ORCA-AGE) is described. It is a powerful toolchain for the automatic implementation of wavefunction-based quantum chemical methods. ORCA-AGE consists of three main modules: (1) generation of "raw" equations from a second quantized Ansatz for the wavefunction, (2) factorization and optimization of equations, and (3) generation of actual computer code. We generate code for the ORCA package, making use of the powerful functionality for wavefunction-based correlation calculations that is already present in the code...
June 13, 2017: Journal of Computational Chemistry
https://www.readbyqxmd.com/read/28606065/neurocognitive-function-in-hiv-infected-persons-with-asymptomatic-cryptococcal-antigenemia-a-comparison-of-three-prospective-cohorts
#13
Martha P Montgomery, Noeline Nakasujja, Bozena M Morawski, Radha Rajasingham, Joshua Rhein, Elizabeth Nalintya, Darlisha A Williams, Kathy Huppler Hullsiek, Agnes Kiragga, Melissa A Rolfes, Renee Donahue Carlson, Nathan C Bahr, Kate E Birkenkamp, Yukari C Manabe, Paul R Bohjanen, Jonathan E Kaplan, Andrew Kambugu, David B Meya, David R Boulware
BACKGROUND: HIV-infected persons with detectable cryptococcal antigen (CrAg) in blood have increased morbidity and mortality compared with HIV-infected persons who are CrAg-negative. This study examined neurocognitive function among persons with asymptomatic cryptococcal antigenemia. METHODS: Participants from three prospective HIV cohorts underwent neurocognitive testing at the time of antiretroviral therapy (ART) initiation. Cohorts included persons with cryptococcal meningitis (N = 90), asymptomatic CrAg + (N = 87), and HIV-infected persons without central nervous system infection (N = 125)...
June 12, 2017: BMC Neurology
https://www.readbyqxmd.com/read/28564647/64th-orca-congress-july-5-8-2017-oslo-norway-abstracts
#14
(no author information available yet)
No abstract text is available yet for this article.
June 1, 2017: Caries Research
https://www.readbyqxmd.com/read/28554115/blubber-depth-distribution-and-bioaccumulation-of-pcbs-and-organochlorine-pesticides-in-arctic-invading-killer-whales
#15
Sara Pedro, Conor Boba, Rune Dietz, Christian Sonne, Aqqalu Rosing-Asvid, Martin Hansen, Anthony Provatas, Melissa A McKinney
Sightings of killer whales (Orcinus orca) in Greenland have increased in recent years, coincident with sea ice loss. These killer whales are likely from fish-feeding North Atlantic populations, but may have access to marine mammal prey in Greenlandic waters, which could lead to increased exposures to biomagnifying contaminants. Most studies on polychlorinated biphenyl (PCB) and organochlorine (OC) contaminants in killer whales have used biopsies which may not be representative of contaminant concentrations through the entire blubber depth...
December 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28487524/vertebral-bone-microarchitecture-and-osteocyte-characteristics-of-three-toothed-whale-species-with-varying-diving-behaviour
#16
Tim Rolvien, Michael Hahn, Ursula Siebert, Klaus Püschel, Hans-Joachim Wilke, Björn Busse, Michael Amling, Ralf Oheim
Although vertebral bone microarchitecture has been studied in various tetrapods, limited quantitative data are available on the structural and compositional changes of vertebrae in marine mammals. Whales exhibit exceptional swimming and diving behaviour, and they may not be immune to diving-associated bone pathologies. Lumbar vertebral bodies were analysed in three toothed whale species: the sperm whale (Physeter macrocephalus), orca (Orcinus orca) and harbour porpoise (Phocoena phocoena). The bone volume fraction (BV/TV) did not scale with body size, although the trabeculae were thicker, fewer in number and further apart in larger whale species than in the other two species...
May 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28464669/killer-whale-orcinus-orca-behavioral-audiograms
#17
Brian K Branstetter, Judy St Leger, Doug Acton, John Stewart, Dorian Houser, James J Finneran, Keith Jenkins
Killer whales (Orcinus orca) are one of the most cosmopolitan marine mammal species with potential widespread exposure to anthropogenic noise impacts. Previous audiometric data on this species were from two adult females [Szymanski, Bain, Kiehl, Pennington, Wong, and Henry (1999). J. Acoust. Soc. Am. 108, 1322-1326] and one sub-adult male [Hall and Johnson (1972). J. Acoust. Soc. Am. 51, 515-517] with apparent high-frequency hearing loss. All three killer whales had best sensitivity between 15 and 20 kHz, with thresholds lower than any odontocete tested to date, suggesting this species might be particularly sensitive to acoustic disturbance...
April 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28429612/a-unique-database-for-gathering-data-from-a-mobile-app-and-medical-prescription-software-a-useful-data-source-to-collect-and-analyse-patient-reported-outcomes-of-depression-and-anxiety-symptoms
#18
Yoshinori Watanabe, Yoko Hirano, Yuko Asami, Maki Okada, Kazuya Fujita
A unique database named 'AN-SAPO' was developed by Iwato Corp. and Japan Brain Corp. in collaboration with the psychiatric clinics run by Himorogi Group in Japan. The AN-SAPO database includes patients' depression/anxiety score data from a mobile app named AN-SAPO and medical records from medical prescription software named 'ORCA'. On the mobile app, depression/anxiety severity can be evaluated by answering 20 brief questions and the scores are transferred to the AN-SAPO database together with the patients' medical records on ORCA...
April 21, 2017: International Journal of Psychiatry in Clinical Practice
https://www.readbyqxmd.com/read/28273531/a-rapid-analytical-method-to-quantify-complex-organohalogen-contaminant-mixtures-in-large-samples-of-high-lipid-mammalian-tissues
#19
Jean-Pierre Desforges, Igor Eulaers, Luke Periard, Christian Sonne, Rune Dietz, Robert J Letcher
In vitro investigations of the health impact of individual chemical compounds have traditionally been used in risk assessments. However, humans and wildlife are exposed to a plethora of potentially harmful chemicals, including organohalogen contaminants (OHCs). An alternative exposure approach to individual or simple mixtures of synthetic OHCs is to isolate the complex mixture present in free-ranging wildlife, often non-destructively sampled from lipid rich adipose. High concentration stock volumes required for in vitro investigations do, however, pose a great analytical challenge to extract sufficient amounts of complex OHC cocktails...
June 2017: Chemosphere
https://www.readbyqxmd.com/read/28266120/prevention-and-control-of-dental-caries-and-periodontal-diseases-at-individual-and-population-level-consensus-report-of-group-3-of-joint-efp-orca-workshop-on-the-boundaries-between-caries-and-periodontal-diseases
#20
Søren Jepsen, Juan Blanco, Wolfgang Buchalla, Joana C Carvalho, Thomas Dietrich, Christof Dörfer, Kenneth A Eaton, Elena Figuero, Jo E Frencken, Filippo Graziani, Susan M Higham, Thomas Kocher, Marisa Maltz, Alberto Ortiz-Vigon, Julian Schmoeckel, Anton Sculean, Livia M A Tenuta, Monique H van der Veen, Vita Machiulskiene
BACKGROUND: The non-communicable diseases dental caries and periodontal diseases pose an enormous burden on mankind. The dental biofilm is a major biological determinant common to the development of both diseases, and they share common risk factors and social determinants, important for their prevention and control. The remit of this working group was to review the current state of knowledge on epidemiology, socio-behavioural aspects as well as plaque control with regard to dental caries and periodontal diseases...
March 2017: Journal of Clinical Periodontology
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