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https://www.readbyqxmd.com/read/28944984/novel-fluorophores-based-on-regioselective-intramolecular-friedel-crafts-acylation-of-the-pyrene-ring-using-triflic-acid
#1
Tanguy Jousselin-Oba, Kamal Sbargoud, Gianfranco Vaccaro, Francesco Meinardi, Abderrahim Yassar, Michel Frigoli
The extension of the pyrene ring from dimethyl 2,2'-(pyrene-1,6-diyl)dibenzoate derivatives by an intramolecular Friedel-Crafts acylation can be realized in an efficient and regioselective manner using triflic acid as proton source. Naphtho-tetracenone derivatives are obtained in high yields at room temperature while Bis-tetracene-diones are prepared upon heating. Both products display interesting fluorescence properties in the visible range with quantum yields varying from 50 to 60%.
September 25, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28944813/transparent-amorphous-strontium-titanate-resistive-memories-with-transient-photo-response
#2
Taimur Ahmed, Sumeet Walia, Jeeson Kim, Hussein Nili, Rajesh Ramanathan, Edwin L H Mayes, Desmond W M Lau, Omid Kavehei, Vipul Bansal, Madhu Bhaskaran, Sharath Sriram
Transparent non-volatile memory devices are desirable for realizing visually-clear integrated systems for information storage. Optical transparency provides advantages in applications such as smart glass electronic devices and wearable electronics. However, achieving high transparency limits the choice of active layers as well as the electrodes; thereby, constraining device processing and performance. Here, we demonstrate bilayer transparent memory cells using room temperature deposited amorphous strontium titanate as the functional material and indium tin oxide electrodes...
September 25, 2017: Nanoscale
https://www.readbyqxmd.com/read/28944796/aunps-cofs-as-a-new-type-of-sers-substrate-for-sensitive-recognition-of-polyaromatic-hydrocarbons
#3
Juan He, Fujian Xu, Zhuo Chen, Xiandeng Hou, Qin Liu, Zhou Long
In this work, Au nanoparticles self-assembled with covalent-organic frameworks via a 1 min process at room temperature, and the obtained nanocomposite was employed as a new type of surface-enhanced Raman scattering sensor for the recognition of polycyclic aromatic hydrocarbons with high sensitivity.
September 25, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28944703/hospital-costs-for-patients-with-lower-extremity-cellulitis-a-retrospective-population-based-study
#4
Douglas Challener, Jasmine Marcelin, Sue Visscher, Larry Baddour
BACKGROUND: Hospital admissions for non-purulent lower extremity cellulitis (NLEC) are common and can be prolonged and costly. Newer treatment options and preventive strategies are expected to result in cost savings before implementation, but few studies have quantified the cost of conventional treatment. METHODS: Using the Rochester Epidemiology Project, the incidence of NLEC in Olmsted County, MN in 2013 was 176.6 per 100,000 persons. The subset of patients who required hospitalization for NLEC in 2013 was determined...
September 23, 2017: Hospital Practice (Minneapolis)
https://www.readbyqxmd.com/read/28944676/multiphoton-absorption-order-of-cspbbr3-as-determined-by-wavelength-dependent-nonlinear-optical-spectroscopy
#5
Felix Ochieng Saouma, Constantinos C Stoumpos, Mercouri G Kanatzidis, Yong Soo Kim, Joon I Jang
CsPbBr3 is a direct-gap semiconductor where optical absorption takes place across the fundamental bandgap. But this all-inorganic halide perovskite typically exhibits above-bandgap emission when excited over an energy level, lying above the conduction-band minimum. We probe this bandgap anomaly using wavelength-dependent multiphoton absorption spectroscopy and find that the fundamental gap is strictly two-photon forbidden, rendering it three-photon absorption (3PA) active. Instead, two-photon absorption (2PA) commences when the two-photon energy is resonant with the optical gap, associated with the level causing the anomaly...
September 25, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28944600/digital-disruption-maternal-mobile-device-use-is-related-to-infant-social-emotional-functioning
#6
Sarah Myruski, Olga Gulyayeva, Samantha Birk, Koraly Pérez-Edgar, Kristin A Buss, Tracy A Dennis-Tiwary
Mobile device use has become increasingly prevalent, yet its impact on infant development remains largely unknown. When parents use mobile devices in front of infants, the parent is physically present but most likely distracted and unresponsive. Research using the classic Still Face Paradigm (SFP) suggests that parental withdrawal and unresponsiveness may have negative consequences for children's social-emotional development. In the present study, 50 infants aged 7.20 to 23.60 months (M = 15.40, SD = 4.74) and their mothers completed a modified SFP...
September 24, 2017: Developmental Science
https://www.readbyqxmd.com/read/28944588/left-ventricular-perforation-after-impella%C3%A2-placement-in-a-patient-with-cardiogenic-shock
#7
David C Peritz, Lee Linstroth, Craig H Selzman, Edward M Gilbert
Mechanical cardiovascular support devices are now widely used both in the setting of cardiogenic shock as well as during high risk cardiac catheterization procedures. We report a case of a young female patient who presented with presumed myocarditis and rapidly deteriorating decompensated heart failure requiring the implantation of an Impella Circulatory Support System. Upon transfer to our facility it was discovered that during transport, the Impella device had migrated through the left ventricle. She was emergently taken to the operating room where the Impella was surgically removed and biventricular support devices were placed...
September 25, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28944514/room-temperature-decarboxylative-and-oxidative-2-2-2-annulation-of-benzoic-acids-with-alkynes-catalyzed-by-an-electron-deficient-rhodium-iii-complex
#8
Yusaku Honjo, Yu Shibata, Eiji Kudo, Tomoya Namba, Koji Masutomi, Ken Tanaka
It has been established that an electron-deficient (η5-cyclopentadienyl)rhodium(III) [CpERhIII] complex is capable of catalyzing the decarboxylative and oxidative [2+2+2] annulation of benzoic acids with alkynes to produce substituted naphthalenes at room temperature. The appropriate choice of the additive and the solvent is crucial for this transformation. This catalyst system allowed use of oxygen as a terminal oxidant and broadened the substrate scope including both aromatic and aliphatic alkynes. In this catalysis, the electron deficient nature of the CpERhIII catalyst would cause the strong rhodium-π interaction, which accelerates the decarboxylation as well as the C-H bond cleavage...
September 25, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28944385/correction-self-segregated-nanostructure-in-room-temperature-ionic-liquids
#9
Diego Pontoni, Julia Haddad, Marco Di Michiel, Moshe Deutsch
Correction for 'Self-segregated nanostructure in room temperature ionic liquids' by Diego Pontoni et al., Soft Matter, 2017, DOI: 10.1039/c7sm01464c.
September 25, 2017: Soft Matter
https://www.readbyqxmd.com/read/28944342/a-rare-case-retrocecal-appendicitis-adherent-to-the-liver-capsule
#10
Hasan Börekçi, Sinan Karacabey, Mesut Sipahi, Zeynep Tuğba Özdemir, Mustafa Fatih Erkoç
The cases of appendicitis take an important place in the hospital emergency departments and it must be kept in mind in the differential diagnosis of patients presenting with abdominal pain. Related to cecum, the appendix can be found in many different positions; however, it is mostly observed descending intraperitoneally (31-74%) and at the retrocecal region (26-65%). In this case report, we present the case of a 26-year-old female patient admitted to the emergency room with a colic pain in the right upper quadrant for about 2 days...
2017: Turk J Surg
https://www.readbyqxmd.com/read/28944272/the-effect-of-environmental-temperature-on-exercise-dependent-release-of-brain-derived-neurotrophic-factor
#11
Christopher W Collins, Robert J Shute, Matthew W S Heesch, Dustin R Slivka
Brain-derived neurotrophic factor (BDNF) is a biomarker of cognitive function that is released into the blood stream following exercise, and cognitive function is impaired by environmental temperatures that are hot and cold. Purpose: To evaluate the exercise-dependent release of BDNF in different environmental temperatures. Methods: Recreationally trained males each completed three trials consisting of cycling for 1 h at 60% Wmax at three different temperatures: 33°C (hot), 7°C (cold), and 20°C (moderate room temperature)...
2017: Temperature: Multidisciplinary Biomedical Journal
https://www.readbyqxmd.com/read/28944255/soft-x-ray-absorption-spectroscopy-of-metalloproteins-and-high-valent-metal-complexes-at-room-temperature-using-free-electron-lasers
#12
Markus Kubin, Jan Kern, Sheraz Gul, Thomas Kroll, Ruchira Chatterjee, Heike Löchel, Franklin D Fuller, Raymond G Sierra, Wilson Quevedo, Christian Weniger, Jens Rehanek, Anatoly Firsov, Hartawan Laksmono, Clemens Weninger, Roberto Alonso-Mori, Dennis L Nordlund, Benedikt Lassalle-Kaiser, James M Glownia, Jacek Krzywinski, Stefan Moeller, Joshua J Turner, Michael P Minitti, Georgi L Dakovski, Sergey Koroidov, Anurag Kawde, Jacob S Kanady, Emily Y Tsui, Sandy Suseno, Zhiji Han, Ethan Hill, Taketo Taguchi, Andrew S Borovik, Theodor Agapie, Johannes Messinger, Alexei Erko, Alexander Föhlisch, Uwe Bergmann, Rolf Mitzner, Vittal K Yachandra, Junko Yano, Philippe Wernet
X-ray absorption spectroscopy at the L-edge of 3d transition metals provides unique information on the local metal charge and spin states by directly probing 3d-derived molecular orbitals through 2p-3d transitions. However, this soft x-ray technique has been rarely used at synchrotron facilities for mechanistic studies of metalloenzymes due to the difficulties of x-ray-induced sample damage and strong background signals from light elements that can dominate the low metal signal. Here, we combine femtosecond soft x-ray pulses from a free-electron laser with a novel x-ray fluorescence-yield spectrometer to overcome these difficulties...
September 2017: Structural Dynamics (Melville, N.Y.)
https://www.readbyqxmd.com/read/28944001/recurrent-graves-hyperthyroidism-after-prolonged-radioiodine-induced-hypothyroidism
#13
REVIEW
Fariha Salman, Hooman Oktaei, Solomon Solomon, Ebenezer Nyenwe
BACKGROUND: Radioactive iodine (RAI) is the most cost effective therapy for Graves' disease (GD). Patients with GD who have become hypothyroid after therapeutic RAI, rarely develop recurrence of disease. Herein we describe a case of recurrence of thyrotoxicosis after 2 years of hypothyroidism. METHODS: We present the clinical features, laboratory findings, imaging and management of an unusual case of recurrent hyperthyroidism. RESULTS: A 48-year-old male presented to the emergency room with a 2-day history of palpitation, chest discomfort and 30 pounds of weight loss...
July 2017: Therapeutic Advances in Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28943814/helping-children-cope-with-medical-tests-and-interventions
#14
Elvira V Lang, Jacqueline Viegas, Chris Bleeker, Jörgen Bruhn, Geffen Geert-Jan van
Medical procedures and tests become a challenge when anxiety and pain make it difficult for the patient to cooperate or remain still when needed. Fortunately a short intervention with hypnoidal language at the onset of a procedure induces a positive and sustained change in the way pain and anxiety are processed. While anesthesia may appear to be a simple solution to eliminate pain, the adverse effects of pre-anesthesia anxiety on postoperative behavior and recovery are often not fully appreciated. This paper discusses options for self-hypnotic relaxation that are applicable to interactions with children...
March 2017: Journal of Radiology Nursing
https://www.readbyqxmd.com/read/28942836/assessment-of-two-carrier-materials-for-phosphate-solubilizing-biofertilizers-and-their-effect-on-growth-of-wheat-triticum-aestivum-l
#15
Salma Mukhtar, Izzah Shahid, Samina Mehnaz, Kauser A Malik
Biofertilizers are usually carrier-based inoculants containing beneficial microorganisms. Incorporation of microorganisms in carrier material enables easy-handling, long-term storage and high effectiveness of biofertilizers. Objective of the present study was to assess enriched biogas sludge and soil as biofertilizer carriers on growth and yield of wheat. Six phosphate solubilizing strains were used in this study. Three phosphate solubilizing strains, 77-NS2 (Bacillus endophyticus), 77-CS-S1 (Bacillus sphaericus) and 77-NS5 (Enterobacter aerogenes) were isolated from the rhizosphere of sugarcane, two strains, PSB5 (Bacillus safensis) and PSB12 (Bacillus megaterium) from the rhizosphere of wheat and one halophilic phosphate solubilizing strain AT2RP3 (Virgibacillus sp...
December 2017: Microbiological Research
https://www.readbyqxmd.com/read/28942560/keto-ether-and-glycol-ethers-in-the-troposphere-reactivity-toward-oh-radicals-and-cl-atoms-global-lifetimes-and-atmospheric-implications
#16
Javier A Barrera, Pablo R Dalmasso, Raúl A Taccone, Silvia I Lane
Rate coefficients for the gas-phase reactions of OH radicals and Cl atoms with 1-methoxy-2-propanone (1-M-2-PONE), 1-methoxy-2-propanol (1-M-2-POL), and 1-methoxy-2-butanol (1-M-2-BOL) were determined at room temperature and atmospheric pressure using a conventional relative-rate technique. The following absolute rate coefficients were derived: k 1(OH + 1-M-2-PONE) = (0.64 ± 0.13) × 10(-11), k 2(OH + 1-M-2-BOL) = (2.19 ± 0.23) × 10(-11), k 3(Cl + 1-M-2-PONE = (1.07 ± 0.24) × 10(-10), k 4(Cl + 1-M-2-POL) = (2...
September 23, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28942014/a-flow-through-nanoporous-alumina-trypsin-bioreactor-for-mass-spectrometry-peptide-fingerprinting
#17
Marcus Kjellander, Erika Billinger, Harisha Ramachandraiah, Mats Boman, Sara Bergström Lind, Gunnar Johansson
Mass spectrometry-based proteomics benefits from efficient digestion of protein samples. In this study, trypsin was immobilized on nanoporous anodized alumina membranes to create an enzyme reactor suitable for peptide mass fingerprinting. The membranes were derivatized with 3-aminopropyltriethoxysilane and the amino groups were activated with carbonyldiimidazole to allow coupling of porcine trypsin via ε-amino groups. The function was assessed using the artificial substrate Nα-Benzoyl-L-arginine 4-nitroanilide hydrochloride, bovine ribonuclease A and a human plasma sample...
September 20, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/28941765/a-review-of-teaching-methods-and-outcomes-of-resident-phacoemulsification
#18
Kevin Kaplowitz, Mohammad Yazdanie, Azin Abazari
Cataract surgery with phacoemulsification is a challenging procedure for surgeons in training to learn to perform safely, efficiently, and effectively. We review the auxiliary learning tools outside the operating room that residency programs have incorporated into their curriculum to improve surgical skills, including wet lab and surgical simulators. We then discuss different methods of teaching cataract surgery in the operating room. Our goal is to define a learning curve for cataract surgery. We demonstrate that complication rates decline significantly after a resident performs an average of 70 cases...
September 20, 2017: Survey of Ophthalmology
https://www.readbyqxmd.com/read/28941696/technological-aspects-of-lactose-hydrolyzed-milk-powder
#19
Jansen Kelis Ferreira Torres, Rodrigo Stephani, Guilherme M Tavares, Antônio Fernandes de Carvalho, Renata Golin Bueno Costa, Carlos Eduardo Rocha de Almeida, Mariana Ramos Almeida, Luiz Fernando Cappa de Oliveira, Pierre Schuck, Ítalo Tuler Perrone
Few reports describe the effect of lactose hydrolysis on the properties of milk powder during production and storage. Hence, the aim of this study was to evaluate the effects of five different levels of enzymatic lactose hydrolysis during the production and storage of milk powder. As the lactose hydrolysis rate increased, adhesion to the drying chamber also increased, due to higher levels of particle agglomeration. Additionally, more brown powder was obtained when the lactose hydrolysis rate was increased, which in turn negatively affected rehydration ability...
November 2017: Food Research International
https://www.readbyqxmd.com/read/28941559/infection-prevention-strategies-for-procedures-performed-outside-operating-rooms-a-conceptual-integrated-model
#20
Vincent Masse, Michael B Edmond, Daniel J Diekema
No comprehensive guidelines or classification exist for infection prevention strategies for medical procedures performed outside operating rooms. We reviewed the available literature and used our clinical experience to develop a progressive, 5-tiered classification of procedures, encompassing clean, aseptic, sterile-superficial, sterile-invasive, and surgical-like procedures to address this need. We provide a description of these categories, along with relevant examples. We fully acknowledge the limitations of our work, which is intended as a starting point for future efforts and not to be definitive...
September 20, 2017: American Journal of Infection Control
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