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https://www.readbyqxmd.com/read/28718332/a-peculiar-form-of-breast-fat-necrosis-simulating-hyaline-ring-granuloma-so-called-pulse-granuloma-a-rare-complication-of-hyperparathyroidism
#1
Maria García-Martos, Angel Panizo-Santos
Pulse granuloma is a rare, foreign body inflammatory reaction that occurs mainly in the oral cavity. It is exceedingly rare elsewhere, with only isolated cases described in the literature. We report the case of a 79-year-old woman with a history of normocalcemic hyperparathyroidism who presented to our hospital with a painful 4-cm lump in the upper quadrants-upper outer quadrant of her left breast. The clinical and radiological (BIRADS-5) findings were indicative of a malignant lesion. However, core needle biopsy revealed features simulating hyaline ring granuloma (pulse granuloma-like)...
July 1, 2017: International Journal of Surgical Pathology
https://www.readbyqxmd.com/read/28712293/spectroscopic-study-of-thiophene-pyrrole-containing-s-n-heteroheptacenes-with-comparison-to-acenes-and-phenacenes
#2
Alexander Rudnick, Christoph Wetzel, Steffen Tscheuschner, Holger Schmalz, Astrid Vogt, Andreas Greiner, Heinz Baessler, Elena Mena-Osteritz, Peter Bäuerle, Anna Köhler
We report a detailed spectroscopic study concerning the energy levels and vibrational structure of thiophene-pyrrole containing S,N-heteroacenes. The aim of the study is first, to understand the differences in the photoluminescence (PL) efficiencies in this structurally similar series, and second, to compare the electronic structure of S,N-heteroacenes to that of linear acenes and of phenancenes, with a view to derive guidelines for the design of singlet fission material. For S,N-heteroacenes comprising seven fused heterocyclic rings, we observe a higher PL quantum yield for derivatives with terminal thienothiophene units than for thienopyrrole-capped ones...
July 16, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28685897/complex-sclerosing-lesions-and-radial-sclerosing-lesions-on-core-needle-biopsy-low-risk-of-carcinoma-on-excision-in-cases-with-clinical-and-imaging-concordance
#3
Faina Nakhlis, Susan Lester, Christine Denison, Stephanie M Wong, Anne Mongiu, Mehra Golshan
Complex or radial sclerosing lesions (CSL/RSL) are uncommon diagnoses on core needle biopsy with a reported upgrade rate ranging between 0% and 23%. As a result, their management remains controversial. In this study, we sought to determine the rate of malignancy on excision for patients with pure CSL/RSL on core biopsy, and to evaluate future breast cancer risk when CSL/RSL is managed without excision. We retrospectively reviewed 118 cases of CSL/RSL diagnosed on image-guided breast biopsies between 2005 and 2014 at our institution...
July 7, 2017: Breast Journal
https://www.readbyqxmd.com/read/28668423/the-breast-lesion-excision-system-bles-under-stereotactic-guidance-cannot-be-used-as-a-therapeutic-tool-in-the-excision-of-small-areas-of-microcalcifications-in-the-breast
#4
Ruxandra-Iulia Milos, Maria Bernathova, Pascal A Baltzer, Katja Pinker-Domenig, Panagiotis Kapetas, Margaretha Rudas, Thomas Thomas H Helbich
OBJECTIVE: The breast lesion excision system (BLES) is a new, automatic percutaneous breast biopsy device that excises single large specimens using radiofrequency cutting. The aim of this study was to determine whether BLES, under stereotactic guidance, can be used as a therapeutic tool in the assessment of small areas of microcalcifications in the breast by providing samples with clear margins. MATERIAL AND METHODS: In this retrospective study, 149 patients with suspicious (BIRADS 4 or 5) small areas of microcalcifications underwent stereotactic-guided BLES...
August 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28664730/mixed-phenyl-and-thiophene-oligomers-for-bridging-nitronyl-nitroxides
#5
Kubandiran Kolanji, Prince Ravat, Artem S Bogomyakov, Victor I Ovcharenko, Dieter Schollmeyer, Martin Baumgarten
The synthesis of four novel nitronyl nitroxide (NN) biradicals is described which are conjugatively linked through p-ter-phenyl (PPP), ter-thiophene (TTT) and alternating phenylene (P) and thiophene (T) units as PTP and TPT. We first utilized Suzuki and Stille coupling reactions through protection and deprotection protocols to synthesize these (NN) biradicals. Single crystals were efficiently grown for radical precursors of 3, 5, 6, PPP-NNSi, PTP-NNSi and final biradicals of TTT-NN, TPT-NN, and PPP-NN, of which structures and their molecular packing were examined by X-ray diffraction studies...
June 30, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28646723/vacuum-assisted-complete-excision-of-solid-intraductal-intracystic-masses-and-complex-cysts-is-follow-up-necessary
#6
Vanessa Quinn-Laurin, Jean-Charles Hogue, Sylvie Pinault, Nathalie Duchesne
INTRODUCTION: Management of complex cysts and benign intraductal/intracystic masses is controversial. The aim of this study was to determine if the complete removal of the complex cyst lesions with ultrasound-guided vacuum-assisted excision (US-VAE) is sufficient for their safe management when the histological diagnosis obtained at biopsy is benign. SUBJECTS AND METHODS: This is a single institution retrospective study performed on patients who underwent breast biopsy between April 2007 and September 2013...
June 21, 2017: Breast: Official Journal of the European Society of Mastology
https://www.readbyqxmd.com/read/28639638/a-combined-optical-and-epr-spectroscopy-study-azobenzene-based-biradicals-as-reversible-molecular-photoswitches
#7
Eva A Jaumann, Sabrina Steinwand, Szabina Klenik, Jörn Plackmeyer, Jan W Bats, Josef Wachtveitl, Thomas F Prisner
Azobenzene compounds are known as versatile examples for photoswitchable systems because of their isomeric cis- and trans-configurations. The switching between these isomers can be reversibly controlled by light excitation. In this study we characterize two members of this class by joining the azobenzene moiety with each two paramagnetic nitroxide spin labels. Two different linkers were chosen to tune the molecular properties. The combined approach using optical and EPR spectroscopy proved the reversibility of photoexcitation and high fatigue resistance...
June 22, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28605899/generation-and-characterization-of-gas-phase-doubly-charged-biradical-peptide-ions-m-2-%C3%A2-%C3%A2
#8
Y L Elaine Wong, Xiangfeng Chen, Ri Wu, Y L Winnie Hung, Hoi Sze Yeung, T-W Dominic Chan
The gas-phase chemistry of peptide radical ions is attracting considerable interest in the fields of biology and mass spectrometry owing to its capability to provide sequence information on peptides and proteins. In this study, we observed that doubly charged peptide ions (M(2+)) can be produced from the collision-induced dissociation (CID) of Hg(II)-adducted peptide ions. The chemical nature and, thus, the dissociation pathways of this hydrogen-deficient biradical M(2+) species is intriguing. We investigated the generation and dissociation behavior of this M(2+) species under electron-capture dissociation (ECD) and CID conditions...
June 30, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28599086/in-silico-design-of-dnp-polarizing-agents-can-current-dinitroxides-be-improved
#9
Frédéric A Perras, Aaron D Sadow, Marek Pruski
Numerical calculations of enhancement factors offered by dynamic nuclear polarization in solids under magic angle spinning (DNP-MAS) were performed to determine the optimal EPR parameters for a dinitroxide polarizing agent. We found that the DNP performance of a biradical is more tolerant to the relative orientation of the two nitroxide moieties than previously thought. Generally, any condition in which the gyy tensor components of both radicals are perpendicular to one another is expected to have near-optimal DNP performance...
June 9, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28578583/alkyne-bridged-multi-copper-ii-porphyrin-structures-nuances-of-orbital-symmetry-in-long-range-through-bond-mediated-iso-tropic-spin-exchange-interactions
#10
Ruobing Wang, Alexander Brugh, Jeff Rawson, Michael J Therien, Malcolm D E Forbes
Spin and conformational dynamics in symmetric alkyne-bridged multi[copper(II) porphyrin] structures have been studied in toluene solution at variable temperature using steady-state electron paramagnetic resonance (EPR) spectroscopy. Comparison of the dimer EPR spectra to those of Cu porphyrin monomers shows clear evidence of an isotropic exchange interaction (Javg) in these biradicaloid structures, manifested by a significant line broadening in the dimer spectra. The extent of the line broadening depends on molecular structure and temperature, suggesting that Javg is modulated by conformational dynamics that impact the torsional angle distribution between the porphyrin-porphyrin least-squares planes...
June 3, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28574169/dynamic-nuclear-polarization-solid-state-nmr-of-membrane-polypeptides-free-radical-optimization-for-matrix-free-lipid-bilayer-samples
#11
Olivier Ouari, Evgeniy S Salnikov, Sébastien Abel, Ganesan Karthikeyan, Hakim Karoui, Fabien Aussenac, Paul Tordo, Burkhard Bechinger
Dynamic Nuclear Polarization boosts the sensitivity of NMR spectroscopy by orders of magnitude making possible investigations previously out of scope. For MAS solid-state NMR studies the samples are typically mixed with biradicals dissolved in glass forming solvent and investigated at 100K. Here we present new biradical polarizing agents developed for matrix-free samples such as supported lipid bilayers, which are systems widely used for the investigation of membrane proteins of high biomedical importance. A series of 11 biradicals with different structure, geometry and physico-chemical properties was comprehensively tested for DNP performance in lipid bilayers, some of them developed specifically for membranes investigations...
June 2, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28560282/clinical-and-biochemical-data-of-endothelial-function-in-women-consuming-combined-contraceptives
#12
Irina I Lobysheva, Sandrine van Eeckhoudt, Flavia Dei Zotti, Ahmad Rifahi, Lucie Pothen, Christophe Beauloye, Jean-Luc Balligand
The data presented in this article are associated with the research article entitled "Heme-Nitrosylated Hemoglobin and Oxidative Stress in Women Consuming Combined Contraceptives. Clinical Application of the EPR Spectroscopy" (Lobysheva et al., 2017 [1]), and describe the characteristics of redox status in blood, as well as biochemical and clinical parameters of young female subjects consuming (or not) contraceptive pills (CP). Erythrocyte concentration of reduced thiols reflecting erythrocyte redox capacity was measured before and after sample deproteinization by electron paramagnetic resonance spectroscopy (EPR) using a nitroxide biradical spin probe specifically interacting with reduced thiols; additional data were obtained by a colorimetric method using Ellman׳s reagents in the same samples...
August 2017: Data in Brief
https://www.readbyqxmd.com/read/28544173/frozen-acrylamide-gels-as-dynamic-nuclear-polarization-matrices
#13
Jasmine Viger-Gravel, Pierrick Berruyer, David Gajan, Jean-Marie Basset, Anne Lesage, Paul Tordo, Olivier Ouari, Lyndon Emsley
Aqueous acrylamide gels can be used to provide dynamic nuclear polarization (DNP) NMR signal enhancements of around 200 at 9.4 T and 100 K. The enhancements are shown to increase with crosslinker concentration and low concentrations of the AMUPol biradical. This DNP matrix can be used in situations where conventional incipient wetness methods fail, such as to obtain DNP surface enhanced NMR spectra from inorganic nanoparticles. In particular, we obtain (113) Cd spectra from CdTe-COOH NPs in minutes. The spectra clearly indicate a highly disordered cadmium-rich surface...
May 23, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28537070/para-azaquinodimethane-a-compact-quinodimethane-variant-as-an-ambient-stable-building-block-for-high-performance-low-band-gap-polymers
#14
Xuncheng Liu, Bo He, Christopher L Anderson, Jun Kang, Teresa Chen, Jinxiang Chen, Shizhen Feng, Lianjie Zhang, Matthew A Kolaczkowski, Simon J Teat, Michael A Brady, Chenhui Zhu, Lin-Wang Wang, Junwu Chen, Yi Liu
Quinoidal structures incorporating expanded para-quinodimethane (p-QM) units have garnered great interest as functional organic electronic, optical, and magnetic materials. The direct use of the compact p-QM unit as an electronic building block, however, has been inhibited by the high reactivity conveyed by its biradical character. Herein, we introduce a stable p-QM variant, namely p-azaquinodimethane (p-AQM), that incorporates nitrogen atoms in the central ring and alkoxy substituents on the periphery to increase the stability of the quinoidal structure...
June 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28507578/lobular-carcinoma-in-situ-of-the-breast-correlation-between-minimally-invasive-biopsy-and-final-pathology
#15
Bartłomiej Szynglarewicz, Piotr Kasprzak, Agnieszka Hałoń, Rafał Matkowski
INTRODUCTION: Lobular carcinoma in situ (LCIS) is regarded as a non-obligate precursor of invasive breast cancer (IBC). Hence, the optimal management of LCIS found on minimally invasive breast biopsy remains a subject of debate. The aim of this study was to evaluate the correlation of biopsy findings with postoperative histology and to identify risk factors for upstaging to IBC. MATERIAL AND METHODS: Twenty-seven patients with pure LCIS diagnosed on image-guided biopsy (vacuum-assisted or core-needle) underwent subsequent surgery...
April 1, 2017: Archives of Medical Science: AMS
https://www.readbyqxmd.com/read/28494278/outcomes-of-ultrasound-guided-axillary-lymph-node-sampling-in-the-absence-of-primary-breast-cancer
#16
Kirema Garcia-Reyes, Heather I Greenwood, Elissa R Price
PURPOSE: To evaluate outcomes of lymph node sampling in patients with suspicious axillary nodes without a diagnosis of breast cancer. MATERIALS AND METHODS: We retrospectively identified all axillary ultrasound-guided sampling performed at our institution from 2003 to 2016 in patients. without malignancy. RESULTS: Seventy-eight lymph nodes met inclusion criteria. Two of the 78 sampled nodes (2.6%) were malignant. CONCLUSION: Sampling of suspicious nodes in patients without a history of breast cancer rarely yields malignancy...
May 5, 2017: Clinical Imaging
https://www.readbyqxmd.com/read/28484972/radical-generation-from-the-gas-phase-activation-of-ionized-lipid-ozonides
#17
Shane R Ellis, Huong T Pham, Marc In Het Panhuis, Adam J Trevitt, Todd W Mitchell, Stephen J Blanksby
Reaction products from the ozonolysis of unsaturated lipids at gas-liquid interfaces have the potential to significantly influence the chemical and physical properties of organic aerosols in the atmosphere. In this study, the gas-phase dissociation behavior of lipid secondary ozonides is investigated using ion-trap mass spectrometry. Secondary ozonides were formed by reaction between a thin film of unsaturated lipids (fatty acid methyl esters or phospholipids) with ozone before being transferred to the gas phase as [M + Na](+) ions by electrospray ionization...
July 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28480663/correlations-between-tumor-to-background-ratio-on-breast-specific-gamma-imaging-and-prognostic-factors-in-breast-cancer
#18
Soo Jin Lee, Yun Young Choi, Chanwoo Kim, Min Sung Chung
The purpose of this study was to investigate the correlations between tumor-to-background ratio (TBR) obtained from breast-specific gamma imaging (BSGI) and the prognostic factors of breast cancer. Sixty-seven patients with invasive ductal carcinoma who underwent preoperative BSGI were enrolled. The BSGI images were visually scored from 1 to 5 according to a breast imaging reporting and data system (BIRADS). The TBR results obtained from positive BSGI images were compared according to the following prognostic factors: tumor size; axillary lymph node metastasis; nuclear grade (NG); histologic grade (HG); subtype; Ki-67; and the expression profile of estrogen receptor (ER), progesterone receptor (PR), and human epidermal growth factor receptor 2 (HER2)...
June 2017: Journal of Korean Medical Science
https://www.readbyqxmd.com/read/28471621/automated-breast-volumetric-sonography-compared-with-magnetic-resonance-imaging-in-jewish-brca-1-2-mutation-carriers
#19
Osnat Halshtok Neiman, Zippy Erlich, Eitan Friedman, Arie Rundstein, Anat Shalmon, Yael Servadio, Miri Sklair Levy
BACKGROUND: Automated breast volumetric sonography (ABVS) is a new technology with various possible applications. OBJECTIVES: To compare ABVS and breast magnetic resonance imaging (MRI) in the surveillance of women with BRCA1/2 gene mutation carriers. METHODS: We conducted a prospective study in Jewish female BRCA1/2 mutation carriers who underwent breast MRI and ABVS. The results of both exams performed 6 months apart or less, and relevant clinical data, were reviewed...
October 2016: Israel Medical Association Journal: IMAJ
https://www.readbyqxmd.com/read/28456883/gas-phase-reactivity-of-meta-benzyne-analogs-toward-small-oligonucleotides-of-differing-lengths
#20
Fanny Widjaja, Joann P Max, Zhicheng Jin, John J Nash, Hilkka I Kenttämaa
The gas-phase reactivity of two aromatic carbon-centered σ,σ-biradicals (meta-benzyne analogs) and a related monoradical towards small oligonucleotides of differing lengths was investigated in a Fourier-transform ion cyclotron resonance (FT-ICR) mass spectrometer coupled with laser-induced acoustic desorption (LIAD). The mono- and biradicals were positively charged to allow for manipulation in the mass spectrometer. The oligonucleotides were evaporated into the gas phase as intact neutral molecules by using LIAD...
April 29, 2017: Journal of the American Society for Mass Spectrometry
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