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Junsu Lee, Jieun Jeon, Tae-Soo You
Four polar intermetallic compounds belonging to the RE ₂In1- x Li x Ge₂ ( RE = La, Nd, Sm, Gd; x = 0.13(1), 0.28(1), 0.43(1), 0.53(1)) system have been synthesized by the traditional solid-state reaction method, and their crystal structures have been characterized by single-crystal X-ray diffraction (SXRD) analyses. The isotypic crystal structures of four title compounds adopt the Mo₂FeB₂-type structure having the tetragonal space group P4/mbm ( Z = 2, Pearson code tP 40) with three crystallographically independent atomic sites and can be simply described as a pile of the identical 2-dimensioanl (2D) RE ₂In1- x Li x Ge₂ slabs stacked along the c -axis direction...
March 26, 2018: Materials
Volodymyr Pavlyuk, Damian Kulawik, Wojciech Ciesielski, Nazar Pavlyuk, Grygoriy Dmytriv
Magnesium alloys are the basis for the creation of light and ultra-light alloys. They have attracted attention as potential materials for the accumulation and storage of hydrogen, as well as electrode materials in metal-hydride and magnesium-ion batteries. The search for new metal hydrides has involved magnesium alloys with rare-earth transition metals and doped by p- or s-elements. The synthesis and characterization of a new quaternary carbide, namely dimagnesium lithium aluminium carbide, Mg1.52 Li0.24 Al0...
March 1, 2018: Acta Crystallographica. Section C, Structural Chemistry
Alexander Ovchinnikov, Svilen Bobev
The Ga- and In-substituted bismuthides Ca11 Gax Bi10-x , Ca11 Inx Bi10-x , Yb11 Gax Bi10-x , and Yb11 Inx Bi10-x (x < 2) can be readily synthesized employing molten Ga or In metals as fluxes. They crystallize in the tetragonal space group I4/mmm and adopt the Ho11 Ge10 structure type (Pearson code tI84; Wyckoff sequence n2 m j h2 e2 d). The structural response to the substitution of Bi with smaller and electron-poorer In or Ga has been studied by single-crystal X-ray diffraction methods for the case of Ca11 Inx Bi10-x [x = 1...
March 1, 2018: Acta Crystallographica. Section C, Structural Chemistry
Kevin J Kauffman, Matthias A Oberli, J Robert Dorkin, Juan E Hurtado, James C Kaczmarek, Shivani Bhadani, Jeff Wyckoff, Robert Langer, Ana Jaklenec, Daniel G Anderson
mRNA therapeutics hold promise for the treatment of diseases requiring intracellular protein expression and for use in genome editing systems, but mRNA must transfect the desired tissue and cell type to be efficacious. Nanoparticle vectors that deliver the mRNA are often evaluated using mRNA encoding for reporter genes such as firefly luciferase (FLuc); however, single-cell resolution of mRNA expression cannot generally be achieved with FLuc, and, thus, the transfected cell populations cannot be determined without additional steps or experiments...
March 2, 2018: Molecular Therapy. Nucleic Acids
T P Hou, K M Wu, W M Liu, M J Peet, C N Hulme-Smith, L Guo, L Zhuang
Understanding the nature of the magnetic-field-induced precipitation behaviors represents a major step forward towards unravelling the real nature of interesting phenomena in Fe-based alloys and especially towards solving the key materials problem for the development of fusion energy. Experimental results indicate that the applied high magnetic field effectively promotes the precipitation of M 23 C 6 carbides. We build an integrated method, which breaks through the limitations of zero temperature and zero external field, to concentrate on the dependence of the stability induced by the magnetic effect, excluding the thermal effect...
February 14, 2018: Scientific Reports
Shu-Wei Wang, Cheng-Rong Hsing, Ching-Ming Wei
Random structure searching has been proved to be a powerful approach to search and find the global minimum and the metastable structures. A true random sampling is in principle needed yet it would be highly time-consuming and/or practically impossible to find the global minimum for the complicated systems in their high-dimensional configuration space. Thus the implementations of reasonable constraints, such as adopting system symmetries to reduce the independent dimension in structural space and/or imposing chemical information to reach and relax into low-energy regions, are the most essential issues in the approach...
February 7, 2018: Journal of Chemical Physics
Subrata Sarkar, Seetha Shankaran, John Barks, Barbara T Do, Abbot R Laptook, Abhik Das, Namasivayam Ambalavanan, Krisa P Van Meurs, Edward F Bell, Pablo J Sanchez, Susan R Hintz, Myra H Wyckoff, Barbara J Stoll, Waldemar A Carlo
OBJECTIVE: To determine the outcome of preterm infants whose cystic periventricular leukomalacia "disappeared" on serial screening cranial imaging studies. STUDY DESIGN: Infants ≤26 weeks of gestation born between 2002 and 2012 who had cranial imaging studies at least twice, the most abnormal study at <28 days of age and another closest to 36 weeks, were reviewed. The outcome of late death (after 36 weeks postmenstrual age) or neurodevelopmental impairment (NDI) in surviving infants at 18-26 months corrected age was compared between the infants with no cystic periventricular leukomalacia on both studies and cystic periventricular leukomalacia that disappeared (cystic periventricular leukomalacia at <28 days but not at 36 weeks), persisted (cystic periventricular leukomalacia on both studies), or appeared late (cystic periventricular leukomalacia only at 36 weeks)...
April 2018: Journal of Pediatrics
Eric D Buras, Emily Weatherup, Jennifer Wyckoff
Background: Ectopic insulin-like growth factor (IGF)-2 production is a rare complication of an array of epithelial and mesenchymal tumors, and can clinically manifest as life-threatening hypoglycemia. Case presentation: A 49-year-old woman with 13-year history of metastatic hemangiopericytoma, previously treated with multiple rounds of chemotherapy and palliative radiation, presented to the emergency department after a hypoglycemic seizure. On arrival, glucose was 18 mg/dL (1...
2018: Clinical Diabetes and Endocrinology
Monika Bajaj, Girija Natarajan, Seetha Shankaran, Myra Wyckoff, Abbot R Laptook, Edward F Bell, Barbara J Stoll, Waldemar A Carlo, Betty R Vohr, Shampa Saha, Krisa P Van Meurs, Pablo J Sanchez, Carl T D'Angio, Rosemary D Higgins, Abhik Das, Nancy Newman, Michele C Walsh
OBJECTIVES: To describe the frequency and extent of delivery room resuscitation and evaluate the association of delivery room resuscitation with neonatal outcomes in moderately preterm (MPT) infants. STUDY DESIGN: This was an observational cohort study of MPT infants delivered at 290/7 to 336/7 weeks' gestational age (GA) enrolled in the Neonatal Research Network MPT registry. Infants were categorized into 5 groups based on the highest level of delivery room intervention: routine care, oxygen and/or continuous positive airway pressure, bag and mask ventilation, endotracheal intubation, and cardiopulmonary resuscitation including chest compressions and/or epinephrine use...
April 2018: Journal of Pediatrics
Otto E O Zeman, Constantin Hoch, Rupert Hochleitner, Thomas Bräuniger
Orientation-dependent NMR spectra of a single crystal of the mineral vanadinite, Pb5 (VO4 )3 Cl, were acquired using only one rotation axis with a general orientation in the hexagonal crystal lattice (space group P63 /m). The chemical shift (CS) tensors for the207 Pb on Wyckoff positions 6h and 4f, and both CS and quadrupole coupling tensor Q for51 V at the positions 6h were determined by including the NMR response of symmetry-related atoms in the unit cell (and in case of207 Pb at 4f, also the isotropic shift from MAS NMR spectra)...
February 2018: Solid State Nuclear Magnetic Resonance
Abbot R Laptook, Edward F Bell, Seetha Shankaran, Nansi S Boghossian, Myra H Wyckoff, Sarah Kandefer, Michele Walsh, Shampa Saha, Rosemary Higgins
OBJECTIVE: To evaluate the temperature distribution among moderately preterm (MPT, 29-33 weeks) and extremely preterm (EPT, <29 weeks) infants upon neonatal intensive care unit (NICU) admission in 2012-2013, the change in admission temperature distribution for EPT infants between 2002-2003 and 2012-2013, and associations between admission temperature and mortality and morbidity for both MPT and EPT infants. STUDY DESIGN: Prospectively collected data from 18 centers in the Eunice Kennedy Shriver National Institute of Child Health and Human Development Neonatal Research Network were used to examine NICU admission temperature of inborn MPT and EPT infants...
January 2018: Journal of Pediatrics
Athina Pappas, Ira Adams-Chapman, Seetha Shankaran, Scott A McDonald, Barbara J Stoll, Abbot R Laptook, Waldemar A Carlo, Krisa P Van Meurs, Susan R Hintz, Martha D Carlson, Jane E Brumbaugh, Michele C Walsh, Myra H Wyckoff, Abhik Das, Rosemary D Higgins
Importance: Studies of cranial ultrasonography and early childhood outcomes among cohorts of extremely preterm neonates have linked periventricular-intraventricular hemorrhage and cystic periventricular leukomalacia with adverse neurodevelopmental outcomes. However, the association between nonhemorrhagic ventriculomegaly and neurodevelopmental and behavioral outcomes is not fully understood. Objective: To characterize the outcomes of extremely preterm neonates younger than 27 weeks' gestational age who experienced nonhemorrhagic ventriculomegaly that was detected prior to 36 weeks' postmenstrual age...
January 1, 2018: JAMA Pediatrics
Sari Priesand, Jennifer Wyckoff, James Wrobel, Brian Schmidt
Background: The current case report is the first in the literature to report the association between parathyroidectomy and an episode of probable pseudogout in the foot in a patient with diabetes mellitus. Case presentation: The authors present a case of pseudogout of the left foot following a subtotal parathyroidectomy in an 80-year-old female with type 2 diabetes mellitus and primary hyperparathyroidism. Pseudogout, also known as calcium pyrophosphate dehydrate deposition disease, is an unusual metabolic sequela following parathyroidectomy...
2017: Clinical Diabetes and Endocrinology
Vishal S Kapadia, Charitharth V Lal, Venkat Kakkilaya, Roy Heyne, Rashmin C Savani, Myra H Wyckoff
OBJECTIVE: To evaluate the impact of the Neonatal Resuscitation Program (NRP)-recommended low oxygen strategy (LOX) on neonatal morbidities, mortality, and neurodevelopmental outcomes in neonates born preterm. STUDY DESIGN: In March 2011, Parkland Hospital changed from a high oxygen strategy (HOX) of resuscitation with initial 100% oxygen and targeting 85%-94% oxygen saturation for delivery room resuscitation to a LOX with initial 21% oxygen and titrating oxygen to meet NRP-recommended transitional target saturations...
December 2017: Journal of Pediatrics
Tanmay Sarkar, Kunkanadu R Prakasha, Mridula Dixit Bharadwaj, Annigere S Prakash
A theoretical and experimental diffusivity study of Li2 MnO3 and Li1.17 Ni0.17 Mn0.67 O2 has been carried out to investigate the effect of Mn, Ni and surrounding atoms on Li+ diffusion and to understand how the Li+ diffusion trajectory changes with different charge spheres. It is observed that due to the presence of Ni in Li1.17 Ni0.17 Mn0.67 O2 , the activation energy reduces in all the possible diffusion paths, which helps in faster Li+ diffusion. This study brings a new physical insight into Li+ diffusion based on elliptical and straight diffusion trajectories...
December 6, 2017: Physical Chemistry Chemical Physics: PCCP
Kathleen Ann Patrick, Leah Wyckoff
In 2013, a collaboration of organizations in Colorado developed a set of standards to address school nurses' need for current diabetes care practices in the school setting. The Standards of Care for Diabetes Management in the School Setting are successful in meeting the needs of the school nurses in Colorado and are updated annually to continue to provide valid guidelines as diabetes care continues to become more technological and new approaches are adopted. A review of the standards, including background, development, contents, evaluations, and ongoing additions, is provided in this article...
January 2018: NASN School Nurse
Abbot R Laptook, Seetha Shankaran, Jon E Tyson, Breda Munoz, Edward F Bell, Ronald N Goldberg, Nehal A Parikh, Namasivayam Ambalavanan, Claudia Pedroza, Athina Pappas, Abhik Das, Aasma S Chaudhary, Richard A Ehrenkranz, Angelita M Hensman, Krisa P Van Meurs, Lina F Chalak, Amir M Khan, Shannon E G Hamrick, Gregory M Sokol, Michele C Walsh, Brenda B Poindexter, Roger G Faix, Kristi L Watterberg, Ivan D Frantz, Ronnie Guillet, Uday Devaskar, William E Truog, Valerie Y Chock, Myra H Wyckoff, Elisabeth C McGowan, David P Carlton, Heidi M Harmon, Jane E Brumbaugh, C Michael Cotten, Pablo J Sánchez, Anna Maria Hibbs, Rosemary D Higgins
Importance: Hypothermia initiated at less than 6 hours after birth reduces death or disability for infants with hypoxic-ischemic encephalopathy at 36 weeks' or later gestation. To our knowledge, hypothermia trials have not been performed in infants presenting after 6 hours. Objective: To estimate the probability that hypothermia initiated at 6 to 24 hours after birth reduces the risk of death or disability at 18 months among infants with hypoxic-ischemic encephalopathy...
October 24, 2017: JAMA: the Journal of the American Medical Association
Gavin D Perkins, Robert Neumar, Koenraad G Monsieurs, Swee Han Lim, Maaret Castren, Jerry P Nolan, Vinay Nadkarni, Bill Montgomery, Petter Steen, Richard Cummins, Douglas Chamberlain, Richard Aickin, Allan de Caen, Tzong-Luen Wang, David Stanton, Raffo Escalante, Clifton W Callaway, Jasmeet Soar, Theresa Olasveengen, Ian Maconochie, Myra Wyckoff, Robert Greif, Eunice M Singletary, Robert O'Connor, Taku Iwami, Laurie Morrison, Peter Morley, Eddy Lang, Leo Bossaert
2017 marks the 25th anniversary of the International Liaison Committee on Resuscitation (ILCOR). ILCOR was formed in 1992 to create a forum for collaboration among principal resuscitation councils worldwide. Since then, ILCOR has established and distinguished itself for its pioneering vision and leadership in resuscitation science. By systematically assessing the evidence for resuscitation standards and guidelines and by identifying national and regional differences, ILCOR reached consensus on international resuscitation guidelines in 2000, and on international science and treatment recommendations in 2005, 2010 and 2015...
December 2017: Resuscitation
Kristen N Wyckoff, Si Chen, Andrew J Steinman, Qiang He
Stormwater runoff from roadways has increasingly become a regulatory concern for water pollution control. Recent work has suggested roadway stormwater runoff as a potential source of microbial pollutants. The objective of this study was to determine the impact of roadway runoff on the microbiological quality of receiving streams. Microbiological quality of roadway stormwater runoff and the receiving stream was monitored during storm events with both cultivation-dependent fecal bacteria enumeration and cultivation-independent high-throughput sequencing techniques...
September 2017: Journal of Environmental Quality
Karen M Puopolo, Sagori Mukhopadhyay, Nellie I Hansen, C Michael Cotten, Barbara J Stoll, Pablo J Sanchez, Edward F Bell, Abhik Das, Angelita M Hensman, Krisa P Van Meurs, Myra H Wyckoff
BACKGROUND: Premature infants are at high risk of early-onset sepsis (EOS) relative to term infants, and most are administered empirical antibiotics after birth. We aimed to determine if factors evident at birth could be used to identify premature infants at lower risk of EOS. METHODS: Study infants were born at 22 to 28 weeks' gestation in Neonatal Research Network centers from 2006 to 2014. EOS was defined by isolation of pathogenic species from blood or cerebrospinal fluid culture at ≤72 hours age...
November 2017: Pediatrics
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