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6 results on '"B. Moroz"'

1. Silica‐Grafted Tris(neopentyl)aluminum: A Monomeric Aluminum Solid Co‐catalyst for Efficient Nickel‐Catalyzed Ethene Dimerization

Author

Christopher P. Gordon, Jasmine Viger-Gravel, Pierre Florian, Ilia B. Moroz, Christophe Copéret, and Anne Lesage

Subjects
Tris, 010405 organic chemistry, Cationic polymerization, chemistry.chemical_element, General Chemistry, Nuclear magnetic resonance spectroscopy, General Medicine, 010402 general chemistry, 01 natural sciences, Chloride, Catalysis, 0104 chemical sciences, chemistry.chemical_compound, Nickel, Monomer, chemistry, Polymer chemistry, medicine, Organometallic chemistry, medicine.drug
Abstract

A silica-supported monomeric alkylaluminum co-catalyst was prepared via surface organometallic chemistry by contacting tris(neopentyl)aluminum and partially dehydroxylated silica. This system, fully characterized by solid-state 27 Al NMR spectroscopy augmented by computational studies, efficiently activates (n Bu3 P)2 NiCl2 towards dimerization of ethene, demonstrating comparable activity to previously reported dimeric diethylaluminum chloride supported on silica. Three types of aluminum surface species have been identified: monografted tetracoordinated Al species as well as two types of bisgrafted Al species-tetra- and pentacoordinated. Of them, only the monografted Al species is proposed to be able to activate the (n Bu3 P)2 NiCl2 complex and generate the active cationic species.

Published
2020

2. Eine Brücke zwischen industriellen und wohldefinierten Trägerkatalysatoren

Author

Victor Mougel, Keishi Yamamoto, Matthew P. Conley, Margherita Pucino, Ka Wing Chan, Christophe Copéret, Florian Allouche, Keith Searles, Alexey Fedorov, Ilia B. Moroz, Murielle F. Delley, and Pavel A. Zhizhko

Subjects
010405 organic chemistry, Chemistry, General Medicine, 010402 general chemistry, 01 natural sciences, 0104 chemical sciences
Published
2018

3. SU-F-J-174: A Series of Computational Human Phantoms in DICOM-RT Format for Normal Tissue Dose Reconstruction in Epidemiological Studies

Author

A Pyakuryal, B Moroz, C Lee, C Pelletier, and J Jung

Subjects
business.industry, medicine.medical_treatment, Normal tissue, Second cancer, General Medicine, Imaging phantom, 3D CONFORMAL RADIATION THERAPY, Radiation therapy, Computational human phantom, DICOM, medicine, Dosimetry, business, Nuclear medicine
Abstract

Purpose: Epidemiological studies of second cancer risk in radiotherapy patients often require individualized dose estimates of normal tissues. Prior to 3D conformal radiation therapy planning, patient anatomy information was mostly limited to 2D radiological images or not even available. Generic patient CT images are often used in commercial radiotherapy treatment planning system (TPS) to reconstruct normal tissue doses. The objective of the current work was to develop a series of reference size computational human phantoms in DICOM-RT format for direct use in dose reconstruction in TPS. Methods: Contours of 93 organs and tissues were extracted from a series of pediatric and adult hybrid computational human phantoms (newborn, 1-, 5-, 10-, 15-year-old, and adult males and females) using Rhinoceros software. A MATLAB script was created to convert the contours into the DICOM-RT structure format. The simulated CT images with the resolution of 1×1×3 mm3 were also generated from the binary phantom format and coupled with the DICOM-structure files. Accurate volumes of the organs were drawn in the format using precise delineation of the contours in converted format. Due to complex geometry of organs, higher resolution (1×1×1 mm3) was found to be more efficient in the conversion of newborn and 1-year-old phantoms. Results: Contour sets were efficiently converted into DICOM-RT structures in relatively short time (about 30 minutes for each phantom). A good agreement was observed in the volumes between the original phantoms and the converted contours for large organs (NRMSD

Published
2016

4. Cutaneous mastocytosis with atypical mast cells and giant cytoplasmic granules.

Author

Lachapelle J, Moroz B, and Nguyen VH

Subjects
Antigens, CD metabolism, Antigens, Differentiation, Myelomonocytic metabolism, Biomarkers, Tumor metabolism, Cell Nucleus pathology, Child, Cytoplasmic Granules metabolism, Disease Progression, Humans, Male, Mast Cells metabolism, Mastocytosis, Cutaneous metabolism, Proto-Oncogene Proteins c-kit metabolism, Tryptases metabolism, Watchful Waiting, Cytoplasmic Granules pathology, Mast Cells pathology, Mastocytosis, Cutaneous pathology
Abstract

A 12-year-old male presented with an 8-year history of five firm cream colored papules on the right vertex of the scalp. A biopsy showed a dense infiltrate of monomorphous mast cells involving the dermis and extending into the subcutis. A relatively well-circumscribed cluster of larger cells showed pleomorphic nuclei with bilobed and multilobed morphology. Both mast cell populations had an eosinophilic cytoplasm filled with granules ranging in size from small to giant forms. By immunohistochemistry, the cells expressed CD117, tryptase and CD68, and were negative for AE1/AE3, CD1a, CD2 and CD25. S-100 staining revealed only faint cytoplasmic positivity and myeloperoxidase had an inhomogeneous patchy pattern, with an overall staining of less than 5% of the cells. A diagnosis of cutaneous mastocytosis was made and after 6 months follow-up, no progression observed. Clinical correlation and awareness of these unusual morphologic features as being part of the spectrum of cutaneous mastocytosis are important to avoid an erroneous diagnosis of malignancy. Although pleomorphic, multilobed nuclear morphology and giant cytoplasmic granules have not been associated with an aggressive behavior or systemic mastocytosis, close clinical observation is warranted in this context., (Copyright © 2012 John Wiley & Sons A/S.)

Published
2012
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5. Focal epithelial hyperplasia.

Author

Tan AK, Tewfik TL, Moroz B, Thibault MJ, and Watters K

Subjects
Child, Preschool, Epithelium pathology, Female, Focal Epithelial Hyperplasia pathology, Humans, Mouth Mucosa pathology, Tongue Diseases genetics, Tongue Diseases pathology, Focal Epithelial Hyperplasia genetics, Inuit
Published
1995
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6. Cutis marmorata telangiectatica congenita: long-term follow-up, review of the literature, and report of a case in conjunction with congenital hypothyroidism.

Author

Pehr K and Moroz B

Subjects
Child, Female, Follow-Up Studies, Humans, Hypothyroidism complications, Hypothyroidism diagnosis, Infant, Infant, Newborn, Male, Skin Diseases, Vascular complications, Skin Diseases, Vascular diagnosis, Telangiectasis complications, Telangiectasis diagnosis, Time Factors, Congenital Hypothyroidism, Skin Diseases, Vascular congenital, Telangiectasis congenital
Abstract

Cutis marmorata telangiectatica congenita is an uncommon, generally congenital, cutaneous condition. The major skin findings are persistent, fixed cutis marmorata, telangiectasia, and phlebectasia; often, there is associated skin atrophy and ulceration as well. Significantly, two-thirds of patients have other congenital anomalies, although often minor ones. We report a series of eight children with cutis marmorata telangiectatica congenita, including one with associated congenital hypothyroidism, a relationship that has never before been noted.

Published
1993
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