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Sierra E Carter, Rheeda L Walker, Carolyn E Cutrona, Ronald L Simons, Steven R H Beach
OBJECTIVE: We examined the mediational role of symptoms of anxiety in accounting for the association of discrimination and chronic health conditions among African-American women. METHODS: Participants were 646 African-American women who completed self-report measures of perceived racial discrimination, symptoms of anxiety, and diagnosed chronic health problems. RESULTS: We examined the mediation hypothesis using a path analytic procedure. Mediational analyses indicated that, above and beyond symptoms of depression, age, and education status, anxiety symptoms were associated with both racial discrimination (β = ...
November 2016: American Journal of Health Behavior
Janice A Lake, Heather J Walker, Duncan D Cameron, Barry H Lomax
Investigations were undertaken in the context of the potential environmental impact of Carbon Capture and Storage (CCS) transportation in the form of a hypothetical leak of extreme levels of CO2 into the soil environment and subsequent effects on plant physiology. Laboratory studies using purpose built soil chambers, separating and isolating the soil and aerial environments, were used to introduce high levels of CO2 gas exclusively into the rhizosphere. CO2 concentrations greater than 32% in the isolated soil environment revealed a previously unknown whole plant stomatal response...
October 25, 2016: Physiologia Plantarum
Juan Carlos Aranda-Neri, Leticia Suárez-López, Lisa M DeMaria, Dilys Walker
BACKGROUND: Cesarean delivery is one of the most widely used surgical interventions in Latin America and in many cases it is performed with no clear medical indication. Our objective was to analyze the relationship between reported indications for a cesarean and support for that indication in the clinical record in four Mexican hospitals, during the 2006-2007 period. METHODS: The data are from 604 (37.1%) women from a total of 1,625 who were admitted to the hospital in labor, and who gave birth through cesarean...
October 25, 2016: Birth
Matthew J Gazzellone, Mehdi Zarrei, Christie L Burton, Susan Walker, Mohammed Uddin, S M Shaheen, Julie Coste, Rageen Rajendram, Reva J Schachter, Marlena Colasanto, Gregory L Hanna, David R Rosenberg, Noam Soreni, Kate D Fitzgerald, Christian R Marshall, Janet A Buchanan, Daniele Merico, Paul D Arnold, Stephen W Scherer
BACKGROUND: Obsessive-compulsive disorder (OCD) is a heterogeneous neuropsychiatric condition, thought to have a significant genetic component. When onset occurs in childhood, affected individuals generally exhibit different characteristics from adult-onset OCD, including higher prevalence in males and increased heritability. Since neuropsychiatric conditions are associated with copy number variations (CNVs), we considered their potential role in the etiology of OCD. METHODS: We genotyped 307 unrelated pediatric probands with idiopathic OCD (including 174 that were part of complete parent-child trios) and compared their genotypes with those of 3861 population controls, to identify rare CNVs (<0...
2016: Journal of Neurodevelopmental Disorders
Shilpa Nagaraju, Naomi Kathleen Davies, David Jeffrey Fraser Walker, Michael Köpke, Séan Dennis Simpson
BACKGROUND: Impactful greenhouse gas emissions abatement can now be achieved through gas fermentation using acetogenic microbes for the production of low-carbon fuels and chemicals. However, compared to traditional hosts like Escherichia coli or yeast, only basic genetic tools exist for gas-fermenting acetogens. To advance the process, a robust genetic engineering platform for acetogens is essential. RESULTS: In this study, we report scarless genome editing of an industrially used model acetogen, Clostridium autoethanogenum, using the CRISPR/Cas9 system...
2016: Biotechnology for Biofuels
Anne K Ellis, Mena Soliman, Lisa M Steacy, Daniel E Adams, Barnaby Hobsbawn, Terry J B Walker
BACKGROUND: The Environmental Exposure Unit (EEU) in Kingston, Ontario, Canada is a controlled allergen challenge facility (CACF) that has been previously clinically validated for the use of ragweed and grass pollen in clinical studies. In this study we aim to validate the use of birch pollen to challenge allergic participants. METHODS: A total of 59 volunteers were screened and 38 birch allergic participants and ten non-allergics completed the study, outside of tree pollen season...
2016: Allergy, Asthma, and Clinical Immunology
Steven Walker, Anna C Bibby, Nick A Maskell
Malignant pleural effusions (MPEs) are an important cause of cancer-related mortality and morbidity. It is a heterogeneous group of conditions, which leads to debilitating symptoms and confers a poor prognosis. Recent well-designed randomized trials have provided a broader evidence base for an expanding range of treatment options. Together, with new prognostic scoring systems and a greater understanding of how different patient phenotypes respond to treatment, this allows greater personalization of management...
October 24, 2016: Therapeutic Advances in Respiratory Disease
Gurusankar Saravanabhavan, Kate Werry, Mike Walker, Douglas Haines, Morie Malowany, Cheryl Khoury
Human biomonitoring reference values are statistical estimates that indicate the upper margin of background exposure to a given chemical at a given time. Nationally representative human biomonitoring data on 176 chemicals, including several metals and trace elements, are available in Canada from 2007 to 2013 through the Canadian Health Measures Survey (CHMS). In this work, we used a systematic approach based on the reference interval concept proposed by the International Federation of Clinical Chemistry and Laboratory Medicine and the International Union of Pure and Applied Chemistry to derive reference values (RV95s) for metals and trace elements...
October 17, 2016: International Journal of Hygiene and Environmental Health
Annie Lévesque, Aimee N C Campbell, Martina Pavlicova, Mei-Chen Hu, Robrina Walker, Erin A McClure, Udi E Ghitza, Genie Bailey, Maxine Stitzer, Edward V Nunes
OBJECTIVE: Coping strategies are a predictor of abstinence among patients with substance use disorders. However, little is known regarding the role of coping strategies in the effectiveness of the Community Reinforcement Approach (CRA). Using data from a 12week randomized control trial assessing the effectiveness of the Therapeutic Education System (TES), an internet-delivered version of the CRA combined with contingency management, we tested the role of coping strategies as a mediator of treatment effectiveness...
September 30, 2016: Addictive Behaviors
Qi Zhang, Zhongduo Wang, Feng Hou, Rachel Harding, Xinyi Huang, Aiping Dong, John R Walker, Yufeng Tong
BACKGROUND: Seven in absentia homologs (SIAHs) comprise a family of highly conserved E3 ubiquitin ligases that play an important role in regulating signalling pathways in tumorigenesis, including the DNA damage repair and hypoxia response pathways. SIAH1 and SIAH2 have been found to function as a tumour repressor and a proto-oncogene, respectively, despite the high sequence identity of their substrate binding domains (SBDs). Ubiquitin-specific protease USP19 is a deubiquitinase that forms a complex with SIAHs and counteracts the ligase function...
October 21, 2016: Biochimica et Biophysica Acta
Michael J Waring, Huawei Chen, Alfred A Rabow, Graeme Walker, Romel Bobby, Scott Boiko, Rob H Bradbury, Rowena Callis, Edwin Clark, Ian Dale, Danette L Daniels, Austin Dulak, Liz Flavell, Geoff Holdgate, Thomas A Jowitt, Alexey Kikhney, Mark McAlister, Jacqui Méndez, Derek Ogg, Joe Patel, Philip Petteruti, Graeme R Robb, Matthew B Robers, Sakina Saif, Natalie Stratton, Dmitri I Svergun, Wenxian Wang, David Whittaker, David M Wilson, Yi Yao
Proteins of the bromodomain and extraterminal (BET) family, in particular bromodomain-containing protein 4 (BRD4), are of great interest as biological targets. BET proteins contain two separate bromodomains, and existing inhibitors bind to them monovalently. Here we describe the discovery and characterization of probe compound biBET, capable of engaging both bromodomains simultaneously in a bivalent, in cis binding mode. The evidence provided here was obtained in a variety of biophysical and cellular experiments...
October 24, 2016: Nature Chemical Biology
Lindsey L Kennedy, Fanyin Meng, Julie K Venter, Tianhao Zhou, Walker A Karstens, Laura A Hargrove, Nan Wu, Konstantina Kyritsi, John Greene, Pietro Invernizzi, Francesca Bernuzzi, Shannon S Glaser, Heather L Francis, Gianfranco Alpini
Cholestasis is a condition that leads to chronic hepatobiliary inflammation, fibrosis, and eventually cirrhosis. Many microRNAs (miRs) are known to have a role in fibrosis progression; however, the role of miR-21 during cholestasis remains unknown. Therefore, the aim of this study was to elucidate the role of miR-21 during cholestasis-induced biliary hyperplasia and hepatic fibrosis. Wild-type (WT) and miR-21(-/-) mice underwent Sham or bile duct ligation (BDL) for 1 week, before evaluating liver histology, biliary proliferation, hepatic stellate cell (HSC) activation, fibrotic response, and small mothers against decapentaplegic 7 (Smad-7) expression...
October 24, 2016: Laboratory Investigation; a Journal of Technical Methods and Pathology
Emily S Walker, Seung Ryul Na, Daehwan Jung, Stephen D March, Joon-Seok Kim, Tanuj Trivedi, Wei Li, Li Tao, Minjoo L Lee, Kenneth M Liechti, Deji Akinwande, Seth R Bank
We report the first direct dry transfer of a single-crystalline thin film grown by molecular beam epitaxy. A double cantilever beam fracture technique was used to transfer epitaxial bismuth thin films grown on silicon (111) to silicon strips coated with epoxy. The transferred bismuth films retained electrical, optical, and structural properties comparable to the as-grown epitaxial films. Additionally, we isolated the bismuth thin films on freestanding flexible cured-epoxy post-transfer. The adhesion energy at the bismuth/silicon interface was measured to be ∼1 J/m(2), comparable to that of exfoliated and wet transferred graphene...
October 24, 2016: Nano Letters
Aaron B Stoler, Brent M Walker, William D Hintz, Devin K Jones, Lovisa Lind, Brian M Mattes, Matthew S Schuler, Rick A Relyea
As the number of chemical contaminants in freshwater ecosystems increase, it is important to understand whether contaminants interact in ecologically important ways. We investigated the independent and interactive effects two contaminants that frequently co-occur in freshwater environments among higher latitudes, including a commonly applied insecticide (carbaryl) and road salt (NaCl). We hypothesized that the addition of either contaminant would result in a decline of zooplankton, an algal bloom, and the subsequent decline of both periphyton and periphyton consumers...
October 24, 2016: Environmental Toxicology and Chemistry
Parikshaa Gupta, Dipanjan Haldar, Jasmine Naru, Pranab Dey, Ashutosh Nath Aggarwal, Ranjana Walker Minz, Ritu Aggarwal
BACKGROUND: Oncogenic viruses have recently been allied with lung carcinoma, however, the causal association has not been established till date. The study was conducted to determine the prevalence of high-risk Human papillomavirus (HPV; subtypes 16, 18, 31, 33 and 45), Epstein-Barr virus (EBV) and cytomegalovirus (CMV) in lung carcinoma using polymerase chain reaction (PCR) on fine needle aspirates. METHODS: Fine needle aspirates of patients with lung carcinoma were included as cases...
October 24, 2016: Diagnostic Cytopathology
Julie Jerber, Maha S Zaki, Jumana Y Al-Aama, Rasim Ozgur Rosti, Tawfeg Ben-Omran, Esra Dikoglu, Jennifer L Silhavy, Caner Caglar, Damir Musaev, Beate Albrecht, Kevin P Campbell, Tobias Willer, Mariam Almuriekhi, Ahmet Okay Çağlayan, Jiri Vajsar, Kaya Bilgüvar, Gonul Ogur, Rami Abou Jamra, Murat Günel, Joseph G Gleeson
Cobblestone lissencephaly (COB) is a severe brain malformation in which overmigration of neurons and glial cells into the arachnoid space results in the formation of cortical dysplasia. COB occurs in a wide range of genetic disorders known as dystroglycanopathies, which are congenital muscular dystrophies associated with brain and eye anomalies and range from Walker-Warburg syndrome to Fukuyama congenital muscular dystrophy. Each of these conditions has been associated with alpha-dystroglycan defects or with mutations in genes encoding basement membrane components, which are known to interact with alpha-dystroglycan...
October 14, 2016: American Journal of Human Genetics
Rhiannon K Beckers, Christina Selinger, Ricardo Vilain, Jason Madore, James S Wilmott, Kate Harvey, Anne Holliday, Caroline L Cooper, Elizabeth Robbins, David Gillet, Catherine W Kennedy, Laurence Gluch, Hugh Carmalt, Cindy Mak, Sanjay Warrier, Harriet E Gee, Charles Chan, Anna McLean, Emily Walker, Catriona M McNeil, Jane M Beith, Alexander Swarbrick, Richard A Scolyer, Sandra A O'Toole
No abstract text is available yet for this article.
February 2016: Pathology
Ivan H W Yim, Malcolm B Will, Fiona M Carnochan, William S Walker
Glomus tumors are rare tumors most often occurring in the extremities of the limbs. We report a unique case of a glomus tumor, originally arising in the paraspinal region, which was excised and subsequently recurred in the chest wall with malignant transformation. The recurrence is likely to have been caused by wound seeding. To the best of our knowledge, this is the first report in the English literature of a glomus tumor recurrence secondary to the notion of wound seeding.
November 2016: Annals of Thoracic Surgery
Xiangbing Wu, Chandler L Walker, Qingbo Lu, Wei Wu, Daniel B Eddelman, Jonathan M Parish, Xiao-Ming Xu
Activation of RhoA/Rho kinase leads to growth cone collapse and neurite retraction. Although RhoA/Rho kinase inhibition has been shown to improve axon regeneration, remyelination and functional recovery, its role in neuronal cell death remains unclear. To determine whether RhoA/Rho kinase played a role in neuronal death after injury, we investigated the relationship between RhoA/Rho kinase and cytosolic phospholipase A2 (cPLA2), a lipase that mediates inflammation and cell death, using an in vitro neuronal death model and an in vivo contusive spinal cord injury model performed at the 10th thoracic (T10) vertebral level...
October 22, 2016: Molecular Neurobiology
James Esposito, Zoe Brown, Wendy Stevens, Joanne Sahhar, Candice Rabusa, Jane Zochling, Janet Roddy, Jennifer Walker, Susanna M Proudman, Mandana Nikpour
BACKGROUND: In some rheumatic diseases such as systemic lupus erythematosus (SLE), low serum complement ('hypocomplementaemia') is a feature of active disease. However, the role of hypocomplementaemia in systemic sclerosis (SSc) is unknown. We sought to determine the frequency, clinical associations and relationship to disease activity of hypocomplementaemia in SSc. METHODS: The study included 1140 patients fulfilling the 2013 American College of Rheumatology criteria for SSc...
October 22, 2016: Arthritis Research & Therapy
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