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https://www.readbyqxmd.com/read/28443899/the-role-of-sulfur-oxidation-in-controlling-the-electronic-properties-of-sulfur-containing-host-molecules-for-phosphorescent-organic-light-emitting-diodes
#1
E Varathan, V Subramanian
In this study a series of dibenzothiophene (DBT) derivatives having different valence states of sulfur atoms have been reported as host materials for blue phosphorescent organic light-emitting diodes. Their electronic properties have also been thoroughly investigated to develop structure-property relationships which include the consideration of the effect of various oxidation states of the sulfur atom in the core moiety and linking (C-N linkage) of subunits with the core at different positions. The results obtained from the electronic structure calculations highlight that the triplet energy (ET), singlet-triplet energy difference (ΔEST), reorganization energy for the hole and the injection barrier for the electron decrease with an increase in the oxidation state of the sulfur atom in DBT...
April 26, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28436856/task-based-modeling-of-an-5k-ultra-high-resolution-medical-imaging-system-for-digital-breast-tomosynthesis
#2
Chumin Zhao, Jerzy Kanicki
High-resolution, low noise x-ray detectors based on CMOS active pixel sensor (APS) technology have demonstrated superior imaging performance for digital breast tomosynthesis (DBT). This paper presents a task-based model for a high resolution medical imaging system to evaluate its ability to detect simulated microcalcifications and masses as lesions for breast cancer. Three-dimensional (3D) cascaded system analysis for a 50 μm pixel pitch CMOS APS x-ray detector was integrated with an object task function, a medical imaging display model, and the human eye contrast sensitivity function to calculate the detectability index and area under the ROC curve (AUC)...
April 19, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28430438/controllable-synthesis-of-lindqvist-alkoxopolyoxovanadate-clusters-as-heterogeneous-catalysts-for-sulfoxidation-of-sulfides
#3
Ji-Kun Li, Jing Dong, Chuan-Ping Wei, Song Yang, Ying-Nan Chi, Yan-Qing Xu, Chang-Wen Hu
Six alkoxohexavanadate-based Cu- or Co-POVs [Cu(dpa)(acac)(H2O)]2[V6O13(OMe)6] (1), [Cu(phen)(acac)(MeOH)]2[V6O13(OMe)6] (2), [Co(dpa)(acac)2]2[V6O13(OMe)6]·2MeOH (3), [Co(phen)(acac)2]2[V6O13(OMe)6] (4), [Cu(dpa)(acac)]2[V(IV)2V(V)4O12(OMe)7] (5), and [Cu(dpa)(acac)(MeOH)]2[V(IV)2V(V)4O11(OMe)8] (6) (POV = polyoxovanadate; dpa = 2,2'-dipyridine amine; phen = 1,10-phenanthroline; acac = acetylacetone anion) have been synthesized by controlling the reaction conditions and characterized by single-crystal X-ray diffraction and powder X-ray diffraction analyses, FT-IR spectroscopy, element analyses, and X-ray photoelectron spectroscopy...
April 21, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28417071/twenty-novel-mutations-in-bckdha-bckdhb-and-dbt-genes-in-a-cohort-of-52-saudi-arabian-patients-with-maple-syrup-urine-disease
#4
Faiqa Imtiaz, Abeer Al-Mostafa, Rabab Allam, Khushnooda Ramzan, Nada Al-Tassan, Asma I Tahir, Nouf S Al-Numair, Mohamed H Al-Hamed, Zuhair Al-Hassnan, Mohammad Al-Owain, Hamad Al-Zaidan, Mohammad Al-Amoudi, Alya Qari, Ameera Balobaid, Moeenaldeen Al-Sayed
Maple syrup urine disease (MSUD), an autosomal recessive inborn error of metabolism due to defects in the branched-chain α-ketoacid dehydrogenase (BCKD) complex, is commonly observed among other inherited metabolic disorders in the kingdom of Saudi Arabia. This report presents the results of mutation analysis of three of the four genes encoding the BCKD complex in 52 biochemically diagnosed MSUD patients originating from Saudi Arabia. The 25 mutations (20 novel) detected spanned across the entire coding regions of the BCKHDA, BCKDHB and DBT genes...
June 2017: Molecular Genetics and Metabolism Reports
https://www.readbyqxmd.com/read/28411676/synthesized-digital-mammography-imaging
#5
REVIEW
Phoebe E Freer, Nicole Winkler
Synthesized mammography (SM) is a new imaging technique similar to digital mammography constructed from an acquired digital breast tomosynthesis (DBT) examination. SM allows for widespread screening using DBT, maintaining the benefits of DBT while decreasing the radiation of DBT by nearly half. This article reviews studies evaluating SM, most of which suggest that SM may be appropriate to use clinically to replace an actual acquired conventional 2-dimensional full-field digital mammogram (FFDM) when using DBT for breast cancer screening...
May 2017: Radiologic Clinics of North America
https://www.readbyqxmd.com/read/28411675/breast-tomosynthesis-practical-considerations
#6
REVIEW
Sarah M Friedewald
Digital breast tomosynthesis (DBT) is rapidly becoming the new standard of care for breast cancer screening. DBT has improved on the limitations of traditional digital mammography by increasing cancer detection and decreasing false-positive examinations. Interpretation of DBT is slightly different than digital mammography and therefore experience with the technology is paramount to achieve best performance. Examples of malignancies that should be recalled and benign findings that are safely called as benign are provided in this article...
May 2017: Radiologic Clinics of North America
https://www.readbyqxmd.com/read/28411674/breast-tomosynthesis-clinical-evidence
#7
REVIEW
Steven Poplack
In the last 20 years, there has been rapid evolution of the clinical research on digital breast tomosynthesis supporting its adoption in clinical breast imaging practice. Beginning with proof of principle pilot observational studies and culminating in prospective population-based screening trials and outcome reporting from clinical practice, there is a wealth of data on the DBT technology. This article catalogs the scientific and clinical evidence of DBT, highlighting some of the most important studies that have been reported to date...
May 2017: Radiologic Clinics of North America
https://www.readbyqxmd.com/read/28409416/tributyltin-bioaccumulation-and-toxic-effects-in-freshwater-gastropods-pomacea-canaliculata-after-a-chronic-exposure-field-and-laboratory-studies
#8
María L Martínez, María N Piol, Norma Sbarbati Nudelman, Noemí R Verrengia Guerrero
Freshwater samples and gastropod mollusks (Pomacea canaliculata) were collected at 5 sampling stations located along the lower Río de la Plata basin, Argentina, to assess the extent of tributyltin (TBT) contamination. Determined data revealed the presence of TBT and some of its breakdown products (dibutyltin: DBT, and monobutyltin: MBT) in all freshwater samples and also in soft tissues of P. canaliculata gastropods. Chronic bioassays (6 months) were performed using female gastropods that had been reared under laboratory conditions and exposed to a similar TBT concentration than the value determined in freshwater samples (1 µg L(-1))...
April 13, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28401255/contaminants-in-liquid-organic-fertilizers-used-for-agriculture-in-japan
#9
Dao M Hai, Xuchun Qiu, Hai Xu, Masato Honda, Mitsuyasu Yabe, Kiwao Kadokami, Yohei Shimasaki, Yuji Oshima
To provide an overview of anthropogenic contaminants in liquid organic fertilizers (LOFs), products from four biogas plants in Kyushu, Japan, were analyzed for a wide range of contaminants, including copper, cadmium, tributyltin (TBT), dibutyltin (DBT), perfluorooctane sulfonate, 952 semi-volatile organic compounds, and 89 antibiotics. The highest concentrations of copper (31.1 mg/L) and cadmium (0.08 mg/L) were found in LOFs from the Hita biogas plant. Only ofloxacin and sulfapyridine were detected in total 89 antibiotics screened...
April 11, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28391808/fully-automated-nipple-detection-in-digital-breast-tomosynthesis
#10
Seung-Hoon Chae, Ji-Wook Jeong, Jang-Hwan Choi, Eun Young Chae, Hak Hee Kim, Young-Wook Choi, Sooyeul Lee
BACKGROUND AND OBJECTIVE: We propose a nipple detection algorithm for use with digital breast tomosynthesis (DBT) images. DBT images have been developed to overcome the weaknesses of 2D mammograms for denser breasts by providing 3D breast images. The nipple location acts as an invaluable landmark in DBT images for aligning the right and left breasts and describing the relative location of any existing lesions. METHODS: Nipples may be visible or invisible in a breast image, and therefore a nipple detection method must be able to detect the nipples for both cases...
May 2017: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/28380249/development-and-initial-evaluation-of-the-psychometric-properties-of-the-dialectical-behavior-therapy-barriers-to-implementation-scale-bti-s
#11
Carla D Chugani, Michael E Mitchell, Yevgeny Botanov, Marsha M Linehan
OBJECTIVE: We examined the psychometric properties of the Dialectical Behavior Therapy (DBT) Barriers to Implementation Scale (BTI-S). METHOD: Participants were clinicians completing a bipartite training, separated by 6 months of self-study, to implement DBT. Exploratory factor analysis was conducted with data collected from the initial training period (N = 790), while confirmatory factor analysis was based on data from the final training period (N = 660). RESULTS: The final model included 26 items and 4 factors with overall acceptable fit, χ(2) (293, N = 660) = 460...
April 5, 2017: Journal of Clinical Psychology
https://www.readbyqxmd.com/read/28378409/diffusion-of-digital-breast-tomosynthesis-among-women-in-primary-care-associations-with-insurance-type
#12
Cheryl R Clark, Tor D Tosteson, Anna N A Tosteson, Tracy Onega, Julie E Weiss, Kimberly A Harris, Jennifer S Haas
Digital breast tomosynthesis (DBT) has shown potential to improve breast cancer screening and diagnosis compared to digital mammography (DM). The FDA approved DBT use in conjunction with conventional DM in 2011, but coverage was approved by CMS recently in 2015. Given changes in coverage policies, it is important to monitor diffusion of DBT by insurance type. This study examined DBT trends and estimated associations with insurance type. From June 2011 to September 2014, DBT use in 22 primary care centers in the Dartmouth -Brigham and Women's Hospital Population-based Research Optimizing Screening through Personalized Regimens research center (PROSPR) was examined among women aged 40-89...
April 4, 2017: Cancer Medicine
https://www.readbyqxmd.com/read/28377347/-influence-of-projection-data-correction-on-digital-breast-tomosynthesis-imaging
#13
Xin-Yu Zhang, Hua Zhang, Zhao-Ying Bian, Dong Zeng, Ji He, Xiu-Mei Tian, Jian-Hua Ma, Jing Huang
OBJECTIVE: To investigate the effect of detector performance during digital breast tomography (DBT) projection data acquisition on reconstructed image quality. METHODS: With reference to the traditional detector data correction method and the specific data acquisition pattern in DBT imaging, we utilized dark field correction, light field and its gain correction for processing the projection data collected by the detector. The reconstructed images were evaluated using iterative reconstruction method based on total generalized variation (TGV)...
March 20, 2017: Nan Fang Yi Ke da Xue Xue Bao, Journal of Southern Medical University
https://www.readbyqxmd.com/read/28374502/the-role-of-digital-breast-tomosynthesis-in-the-breast-assessment-clinic-a-review
#14
REVIEW
Suneeta Mall, Sarah Lewis, Patrick Brennan, Jennie Noakes, Claudia Mello-Thoms
Mammography has long been considered as the primary technique in breast cancer detection and assessment. Despite low specificity, mammography has been preferred over other contemporary techniques such as magnetic resonance imaging (MRI), computed tomography (CT) and ultrasonography (US) due to superior sensitivity and significant health economic benefits. The development of a new technique, a limited angle cone beam pseudo-three-dimensional tomosynthesis, digital breast tomosynthesis (DBT), has gained momentum...
April 4, 2017: Journal of Medical Radiation Sciences
https://www.readbyqxmd.com/read/28368663/imaging-features-and-conspicuity-of-invasive-lobular-carcinomas-on-digital-breast-tomosynthesis
#15
Foucauld Chamming's, Ellen Kao, Ann Aldis, Romuald Ferré, Atilla Omeroglu, Caroline Reinhold, Benoit Mesurolle
OBJECTIVE: To review the imaging features of invasive lobular carcinoma (ILC) seen on digital breast tomosynthesis (DBT) in comparison with invasive ductal carcinoma (IDC), and to evaluate whether DBT could improve conspicuity and tumour size assessment of ILC in comparison with digital mammography (DM). METHODS: Institutional review board with waiver of informed consent was obtained for this retrospective study. Patients with ILC or IDC who underwent DBT and DM at the time of diagnosis were included...
May 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28364473/prevalence-of-circadian-misalignment-and-its-association-with-depressive-symptoms-in-delayed-sleep-phase-disorder
#16
Jade M Murray, Tracey L Sletten, Michelle Magee, Christopher Gordon, Nicole Lovato, Delwyn J Bartlett, David J Kennaway, Leon C Lack, Ronald R Grunstein, Steven W Lockley, Shantha M W Rajaratnam
Study Objective: To examine the prevalence of circadian misalignment in clinically diagnosed delayed sleep phase disorder (DSPD) and to compare mood and daytime functioning in those with and without a circadian basis for the disorder. Methods: One hundred and eighty-two DSPD patients aged 16-64 years, engaged in regular employment or school, underwent sleep-wake monitoring in the home, followed by a sleep laboratory visit for assessment of salivary dim light melatonin onset (DLMO)...
January 1, 2017: Sleep
https://www.readbyqxmd.com/read/28364307/a-density-functional-theory-study-on-the-interactions-between-dibenzothiophene-and-tetrafluoroborate-based-ionic-liquids
#17
Jin Lin, Renqing Lü, Chongchong Wu, Ye Xiao, Fei Liang, Temilola Famakinwa
The interactions between dibenzothiophene (DBT) and N-butyl-N-methylimidazolium tetrafluoroborate ([BMIM][BF4]), N-butyl-N-methylmorpholinium tetrafluoroborate ([Bmmorpholinium][BF4]), N-butyl-N-methylpiperdinium tetrafluoroborate ([BMPiper][BF4]), N-butyl-N-methylpyrrolidinium tetrafluoroborate ([BMPyrro][BF4]), and N-butylpyridinium tetrafluoroborate ([BPY][BF4]) were investigated using density functional theory approach. Geometric, electron, and topological properties were analyzed using natural bond orbital, atoms in molecules theory, and noncovalent interaction methods in order to understand intermolecular interactions between DBT and ionic liquids...
April 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28352900/tuning-the-seebeck-coefficient-of-naphthalenediimide-by-electrochemical-gating-and-doping
#18
Qusiy H Al-Galiby, Hatef Sadeghi, David Zsolt Manrique, Colin J Lambert
We investigate the sign and magnitude of the single-molecule Seebeck coefficient of naphthalenediimide (NDI) under the influence of electrochemical gating and doping. The molecule consists of a NDI core with two alkyl chains in the bay-area position, connected to gold electrodes via benzothiophene (DBT) anchor groups. By switching between the neutral, radical and di-anion charge states, we are able to tune the molecular energy levels relative to the Fermi energy of the electrodes. The resulting single-molecule room-temperature Seebeck coefficents of the three charge states are -294...
March 29, 2017: Nanoscale
https://www.readbyqxmd.com/read/28349308/efficient-dibutyltin-dbt-elimination-by-the-microscopic-fungus-metarhizium-robertsii-under-conditions-of-intensive-aeration-and-ascorbic-acid-supplementation
#19
Paulina Siewiera, Sylwia Różalska, Przemysław Bernat
Dibutyltin (DBT) is an environmental pollutant characterized by immunotoxic, neurotoxic, and pro-oxidant properties. In this study, an attempt was made to enhance DBT elimination by the Metarhizium robertsii strain. We observed enhanced fungal growth in the bioreactor (pO2 ≥ 20%) compared to flask cultures (μ max increased from 0.061 to 0.086 h(-1)). Moreover, under aerated conditions, M. robertsii mycelium with "hairy" morphology biodegraded DBT (20 mg l(-1)) 10-fold faster in the bioreactor than in the flask cultures...
March 27, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28349129/effect-of-corexit-9500a-on-mississippi-canyon-crude-oil-weathering-patterns-using-artificial-and-natural-seawater
#20
Gregory M Olson, Heng Gao, Buffy M Meyer, M Scott Miles, Edward B Overton
During the 2010 Deepwater Horizon oil well blowout in the Northern Gulf of Mexico (GoM), the application of 6.97 million litres of chemical dispersants was used at the well-head and on the sea surface to promote oil degradation and weathering of the Mississippi Canyon 252 (MC252) crude oil. Chemical dispersants encourage microbial degradation by increasing the surface area of the spilled oil, which also increases its bioavailability. However, the net beneficial effects of using chemical dispersants on spilled oil and their effects on weathering are not completely elucidated in contemporary literature...
March 2017: Heliyon
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