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https://www.readbyqxmd.com/read/28727974/autoamputation-of-the-appendix-presenting-as-a-calcified-abdominal-mass-following-necrotizing-enterocolitis
#1
Brent R Weil, Alyaa Al-Ibraheemi, Sara O Vargas, Shawn J Rangel
Autoamputation of the appendix has previously been reported in the literature, but it is likely an unusual event. We report a 2-year-old male child who had previously undergone laparotomy and bowel resection for necrotizing enterocolitis. Two years later a calcified intra-abdominal mass was identified on abdominal radiography and ultrasonography. Eventual laparotomy revealed a densely calcified mass within the transverse mesocolon. The mass was uneventfully resected. Pathologic evaluation showed appendiceal tissue, consistent with prior autoamputation of the vermiform appendix...
July 2017: Pediatric and Developmental Pathology
https://www.readbyqxmd.com/read/28727489/third-person-singular-s-in-typical-development-and-specific-language-impairment-input-and-neighbourhood-density
#2
Justin B Kueser, Laurence B Leonard, Patricia Deevy
The purpose of this study was to examine factors promoting the use of third person singular -s by 23 children with specific language impairment (SLI) and 21 children with typical development (TD). Relative proportions of third person singular -s forms in the input (input proportion) were calculated for 25 verbs based on data from an American English corpus of child-directed speech. Neighbourhood density values were also collected for these verbs. With previously collected probes of third person singular -s use for each of these verbs, we found with logistic regression that input proportion was positively associated with the likelihood of third person singular -s use for both groups...
July 20, 2017: Clinical Linguistics & Phonetics
https://www.readbyqxmd.com/read/28727479/extracellular-chloride-is-required-for-efficient-platelet-aggregation
#3
Kirk A Taylor, Darren G S Wilson, Matthew T Harper, Nicholas Pugh
Anion channels perform a diverse range of functions and have been implicated in ATP release, volume regulation, and phosphatidylserine exposure. Platelets have been shown to express several anion channels but their function is incompletely understood. Due to a paucity of specific pharmacological blockers, we investigated the effect of extracellular chloride substitution on platelet activation using aggregometry and flow cytometry. In the absence of extracellular chloride, we observed a modest reduction of the maximum aggregation response to thrombin or collagen-related peptide...
July 20, 2017: Platelets
https://www.readbyqxmd.com/read/28727238/unified-total-synthesis-of-polyoxin-j-l-and-their-fluorinated-analogues-based-on-decarbonylative-radical-coupling-reactions
#4
Masayuki Inoue, Haruka Fujino, Masanori Nagatomo, Atmika Paudel, Suresh Panthee, Hiroshi Hamamoto, Kazuhisa Sekimizu
Polyoxins J (1a) and L (1b) are important members of nucleoside antibiotics. The complex and densely functionalized dipeptide structures of 1a and 1b possess thymine and uracil nucleobases, respectively. Here we report the unified total synthesis of 1a, 1b, and their artificial analogues 1c and 1d, with trifluorothymine and fluorouracil structures. Decarbonylative radical coupling reactions between a-alkoxyacyl tellurides and a chiral glyoxylic oxime ether led to chemo- and stereoselective construction of the ribonucleoside a-amino acid structures of 1a-d without damaging the preinstalled nucleobases...
July 20, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28727219/fractal-crystals-hunting-the-hidden-dimension-in-nanoporous-materials
#5
Lei Wang, Shengcai Zhu, Meikun Shen, Haiwen Tian, Songhai Xie, Hongbin Zhang, Yahong Zhang, Yi Tang
Screw dislocation structure in crystal are origin of symmetry breaking in a wide range of dense phase crystals. Preparation of such analogous structure in framework phase crystals is of great importance in zeolites but still a challenge. On the basis of crystal structure-solving and model building, we found that the two specific intergrowths in MTW zeolite produce this complex fractal and spiral structure. With the structure determined parameters (spiral pitch h, screw angle θ and spatial angle ψ) of Burgers circuit, the screw dislocation structure can be constructed by two different dimensional intergrowth sections...
July 20, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28726833/human-occupation-of-northern-australia-by-65-000-years-ago
#6
Chris Clarkson, Zenobia Jacobs, Ben Marwick, Richard Fullagar, Lynley Wallis, Mike Smith, Richard G Roberts, Elspeth Hayes, Kelsey Lowe, Xavier Carah, S Anna Florin, Jessica McNeil, Delyth Cox, Lee J Arnold, Quan Hua, Jillian Huntley, Helen E A Brand, Tiina Manne, Andrew Fairbairn, James Shulmeister, Lindsey Lyle, Makiah Salinas, Mara Page, Kate Connell, Gayoung Park, Kasih Norman, Tessa Murphy, Colin Pardoe
The time of arrival of people in Australia is an unresolved question. It is relevant to debates about when modern humans first dispersed out of Africa and when their descendants incorporated genetic material from Neanderthals, Denisovans and possibly other hominins. Humans have also been implicated in the extinction of Australia's megafauna. Here we report the results of new excavations conducted at Madjedbebe, a rock shelter in northern Australia. Artefacts in primary depositional context are concentrated in three dense bands, with the stratigraphic integrity of the deposit demonstrated by artefact refits and by optical dating and other analyses of the sediments...
July 19, 2017: Nature
https://www.readbyqxmd.com/read/28726794/biological-iron-sulfur-storage-in-a-thioferrate-protein-nanoparticle
#7
Brian J Vaccaro, Sonya M Clarkson, James F Holden, Dong-Woo Lee, Chang-Hao Wu, Farris L Poole Ii, Julien J H Cotelesage, Mark J Hackett, Sahel Mohebbi, Jingchuan Sun, Huilin Li, Michael K Johnson, Graham N George, Michael W W Adams
Iron-sulfur clusters are ubiquitous in biology and function in electron transfer and catalysis. They are assembled from iron and cysteine sulfur on protein scaffolds. Iron is typically stored as iron oxyhydroxide, ferrihydrite, encapsulated in 12 nm shells of ferritin, which buffers cellular iron availability. Here we have characterized IssA, a protein that stores iron and sulfur as thioferrate, an inorganic anionic polymer previously unknown in biology. IssA forms nanoparticles reaching 300 nm in diameter and is the largest natural metalloprotein complex known...
July 20, 2017: Nature Communications
https://www.readbyqxmd.com/read/28726252/central-amygdala-relaxin-3-rxfp3-signalling-modulates-alcohol-seeking-in-rats
#8
Leigh C Walker, Hanna E Kastman, Elena Krstew, Andrew L Gundlach, Andrew J Lawrence
BACKGROUND AND PURPOSE: Alcohol use disorders are a leading cause of preventable deaths worldwide and stress is a major trigger of relapse. The neuropeptide relaxin-3 and its cognate receptor, relaxin family peptide receptor 3 (RXFP3), modulate stress-induced relapse to alcohol seeking in rats and while the bed nucleus of the stria terminalis has been implicated in this regard, the central nucleus of the amygdala (CeA) also receives a relaxin-3 innervation and CeA neurons densely express RXFP3 mRNA...
July 20, 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/28726117/applying-a-new-bilateral-mammographic-density-segmentation-method-to-improve-accuracy-of-breast-cancer-risk-prediction
#9
Shiju Yan, Yunzhi Wang, Faranak Aghaei, Yuchen Qiu, Bin Zheng
PURPOSE: How to optimally detect bilateral mammographic asymmetry and improve risk prediction accuracy remains a difficult and unsolved issue. Our aim was to find an effective mammographic density segmentation method to improve accuracy of breast cancer risk prediction. METHODS: A dataset including 168 negative mammography screening cases was used. We applied a mutual threshold to bilateral mammograms of left and right breasts to segment the dense breast regions...
July 19, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28725251/custom-made-micro-applicators-for-high-dose-rate-brachytherapy-treatment-of-chronic-psoriasis
#10
Ivan M Buzurovic, Desmond A O'Farrell, Mandar S Bhagwat, Jorgen L Hansen, Thomas C Harris, Scott Friesen, Robert A Cormack, Phillip M Devlin
PURPOSE: In this study, we present the treatment of the psoriatic nail beds of patients refractory to standard therapies using high-dose-rate (HDR) brachytherapy. The custom-made micro applicators (CMMA) were designed and constructed for radiation dose delivery to small curvy targets with complicated topology. The role of the HDR brachytherapy treatment was to stimulate the T cells for an increased immune response. MATERIAL AND METHODS: The patient diagnosed with psoriatic nail beds refractory to standard therapies received monthly subunguinal injections that caused significant pain and discomfort in both hands...
June 2017: Journal of Contemporary Brachytherapy
https://www.readbyqxmd.com/read/28725051/mammographic-density-blood-telomere-length-and-lipid-peroxidation
#11
Natalie J Erdmann, Lea A Harrington, Lisa J Martin
Extensive mammographic density is a strong risk factor for breast cancer, but may also be an indicator of biological age. In this study we examined whether mammographic density is related to blood telomere length, a potential marker of susceptibility to age-related disease. We measured mammographic density by a computer assisted method and blood telomere length using a validated PCR method. Urinary malondialdehyde (MDA), a marker of lipid peroxidation, was measured in 24 hour urine collections. In the 342 women examined telomere length was negatively correlated with age, was lower in postmenopausal compared to premenopausal women and in smokers compared to non-smokers, and was positively correlated with urinary MDA...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28725034/common-shared-genetic-variation-behind-decreased-risk-of-breast-cancer-in-celiac-disease
#12
Emilio Ugalde-Morales, Jingmei Li, Keith Humphreys, Jonas F Ludvigsson, Haomin Yang, Per Hall, Kamila Czene
There is epidemiologic evidence showing that women with celiac disease have reduced risk of later developing breast cancer, however, the etiology of this association is unclear. Here, we assess the extent of genetic overlap between the two diseases. Through analyses of summary statistics on densely genotyped immunogenic regions, we show a significant genetic correlation (r = -0.17, s.e. 0.05, P < 0.001) and overlap (P permuted < 0.001) between celiac disease and breast cancer. Using individual-level genotype data from a Swedish cohort, we find higher genetic susceptibility to celiac disease summarized by polygenic risk scores to be associated with lower breast cancer risk (ORper-SD, 0...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28724786/emergent-cortical-circuit-dynamics-contain-dense-interwoven-ensembles-of-spike-sequences
#13
Joseph B Dechery, Jason N MacLean
Temporal codes are theoretically powerful encoding schemes, but their precise form in neocortex remains unknown in part because of the large number of possible codes and the difficulty in disambiguating informative spikes from statistical noise. A biologically plausible and computationally powerful temporal coding scheme is the Hebbian assembly phase sequence (APS), which predicts reliable propagation of spikes between functionally related assemblies of neurons. Here, we sought to measure the inherent capacity of neocortical networks to produce reliable sequences of spikes, as would be predicted by an APS code...
July 19, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28724452/exercise-energy-expenditure-and-energy-balance-as-measured-with-doubly-labelled-water
#14
Klaas R Westerterp
The doubly labelled water method for the measurement of total daily energy expenditure (TDEE) over 1-3 weeks under daily living conditions is the indicated method to study effects of exercise and extreme environments on energy balance. Subjects consume a measured amount of doubly labelled water (2H2 18O) to increase background enrichment of body water for 18O and 2H, and the subsequent difference in elimination rate between 18O and 2H, as measured in urine, saliva or blood samples, is a measure for carbon dioxide production and thus allows calculation of TDEE...
July 20, 2017: Proceedings of the Nutrition Society
https://www.readbyqxmd.com/read/28724265/facile-synthesis-of-sio2-c-nanoparticles-anchored-on-mwnt-as-high-performance-anode-materials-for-li-ion-batteries
#15
Yan Zhao, Zhengjun Liu, Yongguang Zhang, Almagul Mentbayeva, Xin Wang, M Yu Maximov, Baoxi Liu, Zhumabay Bakenov, Fuxing Yin
Carbon-coated silica nanoparticles anchored on multi-walled carbon nanotubes (SiO2@C/MWNT composite) were synthesized via a simple and facile sol-gel method followed by heat treatment. Scanning and transmission electron microscopy (SEM and TEM) studies confirmed densely anchoring the carbon-coated SiO2 nanoparticles onto a flexible MWNT conductive network, which facilitated fast electron and lithium-ion transport and improved structural stability of the composite. As prepared, ternary composite anode showed superior cyclability and rate capability compared to a carbon-coated silica counterpart without MWNT (SiO2@C)...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28723219/factors-governing-and-application-of-the-cope-rearrangement-of-3-3-dicyano-1-5-dienes-and-related-studies
#16
Ehsan Fereyduni, Alexander J Grenning
Cope and co-workers reported the [3,3] rearrangement of 3,3-dicyano-1,5-dienes in the early 1940s ("The Cope rearrangement"). However, these original substrates have remained largely unstudied until recently. Herein we explore styrene-deconjugating Cope rearrangements, a diastereoselective Cope rearrangement/deconjugative α-allylation sequence, and factors governing α- vs γ-allylation regioselectivity of Knoevenagel adduct allyl anions. Ultimately, these studies result in the synthesis of diverse and functionally dense polycycloalkane frameworks from abundant reagents using simple chemistry...
July 19, 2017: Organic Letters
https://www.readbyqxmd.com/read/28723214/electrokinetic-manipulation-integrated-plasmonic-photonic-hybrid-raman-nanosensors-with-dually-enhanced-sensitivity
#17
Chao Liu, Zheng Wang, Erwen Li, Zexi Liang, Swapnajit Chakravarty, Xiaochuan Xu, Alan X Wang, Ray T Chen, Donglei Fan
To detect biochemicals with ultrahigh sensitivity, efficiency, reproducibility, and specificity has been the holy grail in the development of nanosensors. In this work, we report an innovative type of photonic-plasmonic hybrid Raman nanosensor integrated with electrokinetic manipulation by rational design, which offers dual mechanisms that enhance the sensitivity for molecule detection directly in solution. For the first time, we integrate large arrays of synthesized plasmonic nanocapsules with densely surface distributed silver (Ag) nanoparticles (NPs) on lithographically patterned photonic crystal slabs via electric-field assembling...
March 24, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28723211/improving-fore-a-new-inlet-design-for-filtering-samples-through-individual-microarray-spots
#18
Victoria de Lange, Marco Habegger, Marco Schmidt, János Vörös
In this publication we present an improvement to our previously introduced vertical flow microarray, the FoRe array, which capitalizes on the fusion of immunofiltration and densely packed micron test sites. Filtering samples through individual microarray spots allows us to rapidly analyze dilute samples with high-throughput and high signal-to-noise. Unlike other flowthrough microarrays, in the FoRe design samples are injected into micron channels and sequentially exposed to different targets. This arrangement makes it possible to increase the sensitivity of the microarray by simply increasing the sample volume or to rapidly reconcentrate samples after preprocessing steps dilute the analyte...
March 24, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28723181/mixed-self-assembled-aptamer-and-newly-designed-zwitterionic-peptide-as-antifouling-biosensing-interface-for-electrochemical-detection-of-alpha-fetoprotein
#19
Min Cui, Yu Wang, Mingxia Jiao, Silambarasan Jayachandran, Yumin Wu, Xiaojian Fan, Xiliang Luo
A sensitive and low-fouling aptasensor for alpha-fetoprotein (AFP) was developed based on mixed self-assembled aptamers and newly designed zwitterionic peptides, where densely immobilized peptides formed an antifouling layer to resist nonspecific protein adsorption, and sparsely attached aptamers acted as the recognizing layer to achieve target binding. The obtained biosensing interface responded to the target AFP with a strikingly selective and sensitive manner, exhibited excellent protein-resistant performance even in complex human serum solution, and showed promising feasibility for the quantitative analysis of AFP in real human serum samples...
April 28, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28723069/surface-localized-sealing-of-porous-ultralow-k-dielectric-films-with-ultrathin-2-nanometer-polymer-coating
#20
Seong Jun Yoon, Kwanyong Pak, Taewook Nam, Alexander Yoon, Hyungjun Kim, Sung Gap Im, Byung Jin Cho
Semiconductor integrated circuit chip industries have been striving to introduce porous ultralow-k (ULK) dielectrics into the multilevel interconnection process in order to improve their chip operation speed by reducing capacitance along the signal path. To date, however, highly porous ULK dielectrics (porosity > 40%, dielectric constant (k) < 2.4) have not been successfully adopted in real devices because the porous nature causes many serious problems including non-continuous barrier deposition, penetration of the barrier metal, and reliability issues...
July 19, 2017: ACS Nano
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