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Adah Sachs
Some people with DID, despite years of DID-specific therapy (using the three-phase approach, ISSTD, 2011), seem unable to get better. In particular, they seem unable to remain physically safe ("Phase One") and report continued exposure to abuse. As every fresh hurt causes fresh dissociation, their DID becomes further entrenched over time. Moreover, as dissociation makes the person more vulnerable to being re-abused, they become caught up in a vicious cycle, which further obstructs their efforts toward recovery...
February 23, 2017: Journal of Trauma & Dissociation
Warwick Middleton, Adah Sachs, Martin Dorahy
No abstract text is available yet for this article.
February 16, 2017: Journal of Trauma & Dissociation
Noah J J Johnson, Sha He, Shuo Diao, Emory M Chan, Hongjie Dai, Adah Almutairi
Luminescence quenching at high dopant concentrations generally limits the dopant concentration to less than 1-5 mol% in lanthanide-doped materials, and this remains a major obstacle in designing materials with enhanced efficiency/brightness. In this work, we provide direct evidence that the major quenching process at high dopant concentrations is the energy migration to the surface (i.e., surface quenching) as opposed to the common misconception of cross-relaxation between dopant ions. We show that after an inert epitaxial shell growth, erbium (Er(3+)) concentrations as high as 100 mol% in NaY(Er)F4/NaLuF4 core/shell nanocrystals enhance the emission intensity of both upconversion and downshifted luminescence across different excitation wavelengths (980, 800, and 658 nm), with negligible concentration quenching effects...
February 17, 2017: Journal of the American Chemical Society
Adah S Zhang, Quinn T Ostrom, Carol Kruchko, Lisa Rogers, David M Peereboom, Jill S Barnholtz-Sloan
BACKGROUND: Complete prevalence proportions illustrate the burden of disease in a population. This study estimates the 2010 complete prevalence of malignant primary brain tumors overall and by Central Brain Tumor Registry of the United States (CBTRUS) histology groups, and compares the brain tumor prevalence estimates to the complete prevalence of other common cancers as determined by the Surveillance, Epidemiology, and End Results Program (SEER) by age at prevalence (2010): children (0-14 y), adolescent and young adult (AYA) (15-39 y), and adult (40+ y)...
December 29, 2016: Neuro-oncology
Jason Olejniczak, Guillaume Collet, Viet Anh Nguyen Huu, Minnie Chan, Sangeun Lee, Adah Almutairi
Biodegradable polymeric materials are a key area of investigation in drug delivery and disease treatment. This is due to their proven clinical potential for payload protection, responsivity, and surface modification imparted by the versatile array of polymers available for their formulation. Here, we employ a novel biodegradable azide containing polymer in the formulation of polymeric nanoparticles and show that these particles can then be functionalized, with biorthogonal click reactions, to alter their surface appearance and their ability to interact with biological systems...
December 16, 2016: Biomaterials Science
H G Ularamu, J O Ibu, B A Wood, J N Abenga, D D Lazarus, Y S Wungak, N J Knowles, J Wadsworth, V Mioulet, D P King, D Shamaki, M I Adah
This study describes the molecular characterization of 47 foot-and-mouth disease (FMD) viruses recovered from field outbreaks in Nigeria between 2007 and 2014. Antigen ELISA of viral isolates was used to identify FMD virus serotypes O, A and SAT 2. Phylogenetic analyses of VP1 nucleotide sequences provide evidence for the presence of multiple sublineages of serotype SAT 2, and O/EAST AFRICA 3 (EA-3) and O/WEST AFRICA topotypes in the country. In contrast, for serotype A, a single monophyletic cluster of viruses has persisted within Nigeria (2009-2013)...
October 7, 2016: Transboundary and Emerging Diseases
Noah J J Johnson, Sha He, Viet Anh Nguyen Huu, Adah Almutairi
Paramagnetic gadolinium (Gd(3+))-based nanocrystals (NCs) with a large number of confined gadolinium ions can be expected to heavily enhance the longitudinal (T1) relaxation of water protons compared to clinical gadolinium complexes with only a single paramagnetic center. However, paramagnetic Gd(3+)-NCs reported to date show only a modest T1 relaxivity of ∼10 mM(-1) s(-1) per Gd(3+) at 1.5 T, only about 3-times higher than clinical Gd(3+) complexes. Here we demonstrate a strategy that achieves ultrahigh T1 relaxivity that is about 25-times higher than clinical Gd(3+) complexes by controlling the proximity of water protons to a paramagnetic NC surface...
September 27, 2016: ACS Nano
Ahmed El Halawany, Sha He, Hossein Hodaei, Ahmed Bakry, Mir A N Razvi, Ahmed Alshahrie, Noah J J Johnson, Demetrios N Christodoulides, Adah Almutairi, Mercedeh Khajavikhan
Upconversion of near infrared (NIR) into ultraviolet (UV) radiation could lead to a number of applications in bio-imaging, diagnostics and drug delivery. However, for bare nanoparticles, the conversion efficiency is extremely low. In this work, we experimentally demonstrate strongly enhanced upconversion emission from an ensemble of β-NaYF<sub>4</sub>:Gd<sup>3+</sup>/Yb<sup>3+</sup>/Tm<sup>3+</sup> @NaLuF<sub>4</sub> core-shell nanoparticles trapped in judiciously designed plasmonic nanocavities...
June 27, 2016: Optics Express
Minnie Chan, Adah Almutairi
In the past few decades, advances in imaging equipment and protocols have expanded the role of imaging in in vivo diagnosis and disease management, especially in cancer. Traditional imaging agents have rapid clearance and low specificity for disease detection. To improve accuracy in disease identification, localization and assessment, novel nanomaterials are frequently explored as imaging agents to achieve high detection specificity and sensitivity. A promising material for this purpose are hydrogel nanoparticles, whose high hydrophilicity, biocompatibility, and tunable size in the nanometer range make them ideal for imaging...
January 21, 2016: Materials Horizons
Satoshi Komoto, Mohammed Ignatius Adah, Tomihiko Ide, Tetsushi Yoshikawa, Koki Taniguchi
Bovine group A rotavirus (RVA) G8P[1] strains have been rarely detected in humans. Two Nigerian G8P[1] strains, HMG035 (RVA/Human-tc/NGA/HMG035/1999/G8P[1]) and NGRBg8 (RVA/Cow-tc/NGA/NGRBg8/1998/G8P[1]), were previously suggested to have the VP7, VP4, and NSP1 genes of bovine origin. In order to obtain precise information on the origin and evolution of these G8P[1] strains, the complete nucleotide sequences of the whole genomes of strains HMG035 and NGRBg8 were determined and analyzed in the present study...
September 2016: Infection, Genetics and Evolution
Dickson Adah, Muzammal Hussain, Limei Qin, Li Qin, Jiancun Zhang, Xiaoping Chen
Despite advances in chemotherapy and immunotherapy, advanced lung cancer remains an incurable disease. Novel trends in anticancer therapeutics focus on harnessing the therapeutically-targeted tumor-related immune suppression. In this respect, myeloid-derived suppressor cells (MDSCs) have captured considerable attention in the last few years, as they are vividly implicated in tumor immune escape mechanisms. In this review, we specifically discuss the multifaceted roles of MDSCs in lung tumor microenvironment, encompassing lung tumor growth and progression via suppression of anti-tumor immunity, association with worse prognosis, and hampering the efficacy of lung cancer chemotherapy and immunotherapy...
August 2016: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
Carl-Johan Carling, Jason Olejniczak, Alexandra Foucault-Collet, Guillaume Collet, Mathieu L Viger, Viet Anh Nguyen Huu, Brendan M Duggan, Adah Almutairi
We introduce a means of efficiently photo-uncaging active compounds from amino-1,4-benzoquinone in aqueous environments. Aqueous photochemistry of this photocage with one-photon red light is typically not efficient unless the photocaged molecules are allowed to assemble into nanoparticles. A variety of biologically active molecules were functionalized with the photocage and subsequently formulated into water-dispersible nanoparticles. Red light irradiation through various mammalian tissues achieved efficient photo-uncaging...
March 2016: Chemical Science
Zhen-Ning Zhang, Beatriz C Freitas, Hao Qian, Jacques Lux, Allan Acab, Cleber A Trujillo, Roberto H Herai, Viet Anh Nguyen Huu, Jessica H Wen, Shivanjali Joshi-Barr, Jerome V Karpiak, Adam J Engler, Xiang-Dong Fu, Alysson R Muotri, Adah Almutairi
Probing a wide range of cellular phenotypes in neurodevelopmental disorders using patient-derived neural progenitor cells (NPCs) can be facilitated by 3D assays, as 2D systems cannot entirely recapitulate the arrangement of cells in the brain. Here, we developed a previously unidentified 3D migration and differentiation assay in layered hydrogels to examine how these processes are affected in neurodevelopmental disorders, such as Rett syndrome. Our soft 3D system mimics the brain environment and accelerates maturation of neurons from human induced pluripotent stem cell (iPSC)-derived NPCs, yielding electrophysiologically active neurons within just 3 wk...
March 22, 2016: Proceedings of the National Academy of Sciences of the United States of America
Jessica H Wen, Onkiu Choi, Hermes Taylor-Weiner, Alexander Fuhrmann, Jerome V Karpiak, Adah Almutairi, Adam J Engler
Motile cells navigate through tissue by relying on tactile cues from gradients provided by extracellular matrix (ECM) such as ligand density or stiffness. Mesenchymal stem cells (MSCs) and fibroblasts encounter adhesive or 'haptotactic' gradients at the interface between healthy and fibrotic tissue as they migrate towards an injury site. Mimicking this phenomenon, we developed tunable RGD and collagen gradients in polyacrylamide hydrogels of physiologically relevant stiffness using density gradient multilayer polymerization (DGMP) to better understand how such ligand gradients regulate migratory behaviors...
December 1, 2015: Cellular and Molecular Bioengineering
Jason Olejniczak, Viet Anh Nguyen Huu, Jacques Lux, Madeleine Grossman, Sha He, Adah Almutairi
We describe a means of chemical amplification to accelerate triggered degradation of a polymer and particles composed thereof. We designed a light-degradable copolymer containing carboxylic acids masked by photolabile groups and ketals. Photolysis allows the unmasked acidic groups in the polymer backbone to accelerate ketal hydrolysis even at neutral pH.
December 11, 2015: Chemical Communications: Chem Comm
Jason Olejniczak, Carl-Johan Carling, Adah Almutairi
Light is an excellent means to externally control the properties of materials and small molecules for many applications. Light's ability to initiate chemistries largely independent of a material's local environment makes it particularly useful as a bio-orthogonal and on-demand trigger in living systems. Materials responsive to UV light are widely reported in the literature; however, UV light has substantial limitations for in vitro and in vivo applications. Many biological molecules absorb these energetic wavelengths directly, not only preventing substantial tissue penetration but also causing detrimental photochemical reactions...
December 10, 2015: Journal of Controlled Release: Official Journal of the Controlled Release Society
Caroline de Gracia Lux, Jacques Lux, Guillaume Collet, Sha He, Minnie Chan, Jason Olejniczak, Alexandra Foucault-Collet, Adah Almutairi
Materials that degrade or dissociate in response to low power light promise to enable on-demand, precisely localized delivery of drugs or bioactive molecules in living systems. Such applications remain elusive because few materials respond to wavelengths that appreciably penetrate tissues. The photocage bromohydroxycoumarin (Bhc) is efficiently cleaved upon low-power ultraviolet (UV) and near-infrared (NIR) irradiation through one- or two-photon excitation, respectively. We have designed and synthesized a short Bhc-bearing crosslinker to create light-degradable hydrogels and nanogels...
October 12, 2015: Biomacromolecules
Minnie Chan, Jacques Lux, Tomoki Nishimura, Kazunari Akiyoshi, Adah Almutairi
Clinically approved small-molecule magnetic resonance imaging (MRI) contrast agents are all rapidly cleared from the body and offer weak signal enhancement. To avoid repeated administration of contrast agent and improve signal-to-noise ratios, agents with stronger signal enhancement and better retention in tumors are needed. Therefore, we focused on hydrogels because of their excellent water accessibility and biodegradability. Gadolinium (Gd)-chelating cross-linkers were incorporated into self-assembled pullulan nanogels to both impart magnetic properties and to stabilize this material that has been extensively studied for medical applications...
September 14, 2015: Biomacromolecules
Sophia L Suarez, Aboli A Rane, Adam Muñoz, Adam T Wright, Shirley X Zhang, Rebecca L Braden, Adah Almutairi, Andrew D McCulloch, Karen L Christman
UNLABELLED: Injectable biomaterials have been evaluated as potential new therapies for myocardial infarction (MI) and heart failure. These materials have improved left ventricular (LV) geometry and ejection fraction, yet there remain concerns that biomaterial injection may create a substrate for arrhythmia. Since studies of this risk are lacking, we utilized optical mapping to assess the effects of biomaterial injection and interstitial spread on cardiac electrophysiology. Healthy and infarcted rat hearts were injected with a model poly(ethylene glycol) hydrogel with varying degrees of interstitial spread...
October 2015: Acta Biomaterialia
Carl-Johan Carling, Mathieu L Viger, Viet Anh Nguyen Huu, Arnold V Garcia, Adah Almutairi
Controlling chemistry in space and time has offered scientists and engineers powerful tools for research and technology. For example, on-demand photo-triggered activation of neurotransmitters has revolutionized neuroscience. Non-invasive control of the availability of bioactive molecules in living organisms will undoubtedly lead to major advances; however, this requires the development of photosystems that efficiently respond to regions of the electromagnetic spectrum that innocuously penetrate tissue. To this end, we have developed a polymer that photochemically degrades upon absorption of one photon of visible light and demonstrated its potential for medical applications...
January 1, 2015: Chemical Science
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