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https://www.readbyqxmd.com/read/27797481/screening-libraries-of-semifluorinated-arylene-bisimides-to-discover-and-predict-thermodynamically-controlled-helical-crystallization
#1
Ming-Shou Ho, Benjamin E Partridge, Hao-Jan Sun, Dipankar Sahoo, Pawaret Leowanawat, Mihai Peterca, Robert Graf, Hans W Spiess, Xiangbing Zeng, Goran Ungar, Paul A Heiney, Chain-Shu Hsu, Virgil Percec
Synthesis, structural and retrostructural analysis of a library containing sixteen self-assembling perylene (PBI), 1,6,7,12-tetrachloroperylene (Cl4PBI), naphthalene (NBI), and pyromellitic (PMBI) bisimides functionalized with environmentally friendly AB3 chiral racemic semifluorinated minidendrons at their imide groups via m = 0, 1, 2, and 3 methylene units is reported. These semifluorinated compounds melt at lower temperatures than homologous hydrogenated compounds, permitting screening of all their thermotropic phases via structural analysis to discover thermodynamically controlled helical crystallization from propeller-like, cogwheel, and tilted molecules as well as lamellar-like structures...
October 31, 2016: ACS Combinatorial Science
https://www.readbyqxmd.com/read/27758100/hierarchical-self-organization-of-perylene-bisimides-into-supramolecular-spheres-and-periodic-arrays-thereof
#2
Dipankar Sahoo, Mihai Peterca, Emad Aqad, Benjamin E Partridge, Paul A Heiney, Robert Graf, Hans W Spiess, Xiangbing Zeng, Virgil Percec
Perylene bisimide derivatives (PBIs) are known to form only columnar or lamellar assemblies. There is no known example of a PBI self-assembling into a supramolecular sphere. Therefore, periodic and quasiperiodic arrays generated from spherical assemblies produced from PBIs are also not known. Here, a PBI functionalized at its imide groups with a second generation self-assembling dendron is reported to self-assemble into supramolecular spheres. These spheres self-organize in a body-centered cubic (BCC) periodic array, rarely encountered for self-assembling dendrons but often encountered in block copolymers...
October 19, 2016: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/27741956/can-performance-based-incentives-improve-motivation-of-nurses-and-midwives-in-primary-facilities-in-northern-ghana-a-quasi-experimental-study
#3
Gifty Apiung Aninanya, Natasha Howard, John E Williams, Benjamin Apam, Helen Prytherch, Svetla Loukanova, Eunice Karanja Kamara, Easmon Otupiri
BACKGROUND: Lack of an adequate and well-performing health workforce has emerged as the biggest barrier to scaling up health services provision in sub-Saharan Africa. As the global community commits to the Sustainable Development Goals and universal health coverage, health workforce challenges are critical. In northern Ghana, performance-based incentives (PBIs) were introduced to improve health worker motivation and service quality. OBJECTIVE: The goal of this study was to determine the impact of PBIs on maternal health worker motivation in two districts in northern Ghana...
2016: Global Health Action
https://www.readbyqxmd.com/read/27717388/performance-based-incentives-may-be-appropriate-to-address-challenges-to-delivery-of-prevention-of-vertical-transmission-of-hiv-services-in-rural-mozambique-a-qualitative-investigation
#4
Roseanne C Schuster, Octávio de Sousa, Jacqueline Rivera, Rebecca Olson, Delphine Pinault, Sera L Young
BACKGROUND: Performance-based incentives (PBIs) have garnered global attention as a promising strategy to improve healthcare delivery to vulnerable populations. However, literature gaps in the context in which an intervention is implemented and how the PBIs were developed exist. Therefore, we (1) characterized the barriers and promoters to prevention of vertical transmission of HIV (PVT) service delivery in rural Mozambique, where the vertical transmission rate is 12 %, and (2) assessed the appropriateness for a PBI's intervention and application to PVT...
October 7, 2016: Human Resources for Health
https://www.readbyqxmd.com/read/27715409/community-pharmacies-as-sites-of-adult-vaccination-a-systematic-review
#5
Randall C Burson, Alison M Buttenheim, Allison Armstrong, Kristen A Feemster
Vaccine-preventable deaths among adults remain a major public health concern, despite continued efforts to increase vaccination rates in this population. Alternative approaches to immunization delivery may help address under-vaccination among adults. This systematic review assesses the feasibility, acceptability, and effectiveness of community pharmacies as sites for adult vaccination. We searched 5 electronic databases (PubMed, EMBASE, Scopus, Cochrane, LILACS) for studies published prior to June 2016 and identified 47 relevant articles...
August 15, 2016: Human Vaccines & Immunotherapeutics
https://www.readbyqxmd.com/read/27606233/a-reply-to-the-commentaries-on-school-wide-pbis-an-example-of-applied-behavior-analysis-implemented-at-a-scale-of-social-importance-by-horner-and-sugai-2015-pbis-is-function-over-form-the-clear-behavioral-roots-and-opportunities-the-pbis-framework-presents
#6
Robert F Putnam, Tim Knoster
In the previous issue of Behavior Analysis in Practice (May 2015), a special section of the journal was devoted to positive behavior intervention and support (PBIS). Horner and Sugai (2015) published a manuscript providing an overview of school-wide PBIS describing how PBIS is an example of applied behavior analysis at a scale of social importance. A number of manuscripts providing commentary on the Horner and Sugai manuscript were also published in this special section of the journal. This paper will review this PBIS manuscript along with the associated commentaries published in the May 2015 special section...
March 2016: Behavior Analysis in Practice
https://www.readbyqxmd.com/read/27460557/relationships-between-types-of-father-breastfeeding-support-and-breastfeeding-outcomes
#7
Lynn A Rempel, John K Rempel, Katrina C J Moore
Fathers' support can influence mothers' breastfeeding decisions and behavior. Potentially supportive behaviors have been reported in previous studies, but no studies have directly examined which, if any, of those actions are actually more likely to result in desired breastfeeding outcomes. The two studies reported in this paper address this gap by examining relationships between fathers' reported breastfeeding support and mothers' perceptions of received support and breastfeeding intentions, satisfaction, and duration...
July 27, 2016: Maternal & Child Nutrition
https://www.readbyqxmd.com/read/27407012/direct-observation-of-excimer-mediated-intramolecular-electron-transfer-in-a-cofacially-stacked-perylene-bisimide-pair
#8
Jooyoung Sung, Agnieszka Nowak-Król, Felix Schlosser, Benjamin Fimmel, Woojae Kim, Dongho Kim, Frank Würthner
We have elucidated excimer-mediated intramolecular electron transfer in cofacially stacked PBIs tethered by two phenylene-butadiynylene loops. The electron transfer between energetically equivalent PBIs is revealed by the simultaneous observation of the PBI radical anion and cation bands in the transient absorption spectra. The fluorescence decay time of the excimer states is in good agreement with the rise time of PBI radical bands in transient absorption spectra suggesting that the electron transfer dynamics proceed via the excimer state...
July 27, 2016: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/27346166/caring-for-patients-with-traumatic-brain-injury-a-survey-of-nurses-perceptions
#9
Tolu O Oyesanya, Roger L Brown, Lyn S Turkstra
AIMS AND OBJECTIVES: The purpose of this study was to determine nurses' perceptions about caring for patients with traumatic brain injury (TBI). BACKGROUND: Annually, it is estimated that over 10 million people sustain a TBI around the world. Patients with TBI and families are often concerned with expectations about recovery and seek information from nurses. Nurses' perceptions of care might influence information provided to patients and families, particularly if inaccurate knowledge and perceptions are held...
June 27, 2016: Journal of Clinical Nursing
https://www.readbyqxmd.com/read/27338309/coordination-chemistry-dictates-the-structural-defects-in-lead-halide-perovskites
#10
Sara Rahimnejad, Alexander Kovalenko, Sergio Martí Forés, Clara Aranda, Antonio Guerrero
We show the influence of species present in precursor solution during formation of lead halide perovskite materials on the structural defects of the films. The coordination of lead by competing solvent molecules and iodide ions dictate the type of complexes present in the films. Depending on the processing conditions all PbIS5 (+) , PbI2 S4, PbI3 S3 (-) , PbI4 S2 (2-) , PbI5 S2 (3-) , PbI6 (4-) and 1D (Pb2 I4 )n chains are observed by absorption measurements. Different parameters are studied such as polarity of the solvent, concentration of iodide ions, concentration of solvent molecules and temperature...
September 19, 2016: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/27118053/comparing-versions-of-the-good-behavior-game-can-a-positive-spin-enhance-effectiveness
#11
Elaine Wahl, Renee O Hawkins, Todd Haydon, Richard Marsicano, Julie Q Morrison
Disruptions can prevent the classroom from being an effective learning environment. The Good Behavior Game (GBG) is a group contingency that has been proven to effectively prevent disruptions and increase engagement. However, the traditional methods of the GBG include teacher scanning for negative student behaviors, and may not align with Positive Behavioral Interventions and Supports (PBIS), which is becoming widely adopted in many schools. Extending the findings of Wright and McCurdy, the current study compared the effects of the GBG and a positive version of the GBG, called the Caught Being Good Game (CBGG), on student behavior, including engagement and off-task behaviors, as well as teachers' use of positive and negative statements...
July 2016: Behavior Modification
https://www.readbyqxmd.com/read/26890394/synthesis-photophysical-and-biological-evaluation-of-sulfated-polyglycerol-dendronized-perylenebisimides-pbis-a-promising-platform-for-anti-inflammatory-theranostic-agents
#12
T Heek, C Kühne, H Depner, K Achazi, J Dernedde, R Haag
A set of four water-soluble perylene bisimides (PBI) based on sulfated polyglycerol (PGS) dendrons were developed, their photophysical properties determined via UV/vis and fluorescence spectroscopy, and their performance as possible anti-inflammatory agents evaluated via biological in vitro studies. It could be shown that in contrast to charge neutral PG-PBIs the introduction of the additional electrostatic repulsion forces leads to a decrease in the dendron generation necessary for aggregation suppression, allowing the preparation of PBIs with fluorescence quantum yields of >95% with a considerable decreased synthetic effort...
March 16, 2016: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/26876659/use-of-modified-positive-behavioral-interventions-and-supports-in-a-psychiatric-inpatient-unit-for-high-risk-youths
#13
Elizabeth K Reynolds, Marco A Grados, Nancy Praglowski, Jessica C Hankinson, Renee Deboard-Lucas, Laura Goldstein, Carisa K Perry-Parrish, Matthew W Specht, Rick Ostrander
OBJECTIVE: Despite a call for the reduction and ultimate elimination of the use of seclusion and restraint, research on reduction of these practices in behavioral programs has been limited. This study sought to examine the effectiveness of a modified version of the Positive Behavioral Interventions and Supports (M-PBIS) implemented in a youth psychiatric inpatient unit to reduce use of seclusion and restraint. METHODS: This naturalistic, prospective study covered a four-year period (1,485 admissions)...
May 1, 2016: Psychiatric Services: a Journal of the American Psychiatric Association
https://www.readbyqxmd.com/read/26739784/health-worker-preferences-for-performance-based-payment-schemes-in-a-rural-health-district-in-burkina-faso
#14
Maurice Yé, Eric Diboulo, Moubassira Kagoné, Ali Sié, Rainer Sauerborn, Svetla Loukanova
BACKGROUND: One promising way to improve the motivation of healthcare providers and the quality of healthcare services is performance-based incentives (PBIs) also referred as performance-based financing. Our study aims to explore healthcare providers' preferences for an incentive scheme based on local resources, which aimed at improving the quality of maternal and child health care in the Nouna Health District. DESIGN: A qualitative and quantitative survey was carried out in 2010 involving 94 healthcare providers within 34 health facilities...
2016: Global Health Action
https://www.readbyqxmd.com/read/26699283/impact-of-alkyl-spacer-length-on-aggregation-pathways-in-kinetically-controlled-supramolecular-polymerization
#15
Soichiro Ogi, Vladimir Stepanenko, Johannes Thein, Frank Würthner
We have investigated the kinetic and thermodynamic supramolecular polymerizations of a series of amide-functionalized perylene bisimide (PBI) organogelator molecules bearing alkyl spacers of varied lengths (ethylene to pentylene chains, PBI-1-C2 to PBI-1-C5) between the amide and PBI imide groups. These amide-functionalized PBIs form one-dimensional fibrous nanostructures as the thermodynamically favored states in solvents of low polarity. Our in-depth studies revealed, however, that the kinetic behavior of their supramolecular polymerization is dependent on the spacer length...
January 20, 2016: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/26350026/perylene-bisimide-radicals-and-biradicals-synthesis-and-molecular-properties
#16
David Schmidt, Minjung Son, Jong Min Lim, Mei-Jin Lin, Ivo Krummenacher, Holger Braunschweig, Dongho Kim, Frank Würthner
Unprecedented neutral perylene-3,4:9,10-tetracarboxylic acid bisimide (PBI) radicals and biradicals were synthesized by facile chemical oxidation of 4-hydroxyaryl-substituted PBIs. Subsequent characterization by optical and magnetic spectroscopic techniques, as well as quantum chemical calculations, revealed an open-shell singlet biradical ground state for the PBI biradical OS-2(..) (〈s(2)〉=1.2191) with a relatively small singlet-triplet energy gap of 0.041 eV and a large singlet biradical character of y=0...
November 16, 2015: Angewandte Chemie
https://www.readbyqxmd.com/read/26348064/formation-of-an-ionic-ptca-%C3%AE-cdnh2-complex-and-its-application-for-phenol-sensing-in-aqueous-phase
#17
Lingling Liu, Xiangli Chen, Kaiqiang Liu, Meixia He, Gang Wang, Xingmao Chang, Yu Fang
On the basis of proton transfer in aqueous phase, we prepared a water-soluble and highly fluorescent ionic complex of 3,4,9,10-perylene tetracarboxylic acid (PTCA) and 6-deoxy-6-amino-β-CD (β-CDNH2) and studied its fluorescence behavior. It was found that the fluorescence emission of the complex is sensitive and selective to the presence of trace amount of toxic phenolic compounds, in particular phenol, which is crucial for water quality control. The detection limit (DL) of the method to the analyte is ~0...
September 30, 2015: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/26240988/nontoxic-hydrophilic-cationic-polymers-identified-as-class-of-antimicrobial-polymers
#18
Arne Strassburg, Frauke Kracke, Julia Wenners, Anna Jemeljanova, Jannis Kuepper, Hanne Petersen, Joerg C Tiller
Amphiphilic polycations are an alternative to biocides but also toxic to mammalian cells. Antimicrobially active hydrophilic polycations based on 1,4-dibromo-2-butene and tetramethyl-1,3-propanediamine named PBI are not hemotoxic for porcine red blood cells with a hemocytotoxicity (HC50) of more than 40,000 μg · mL(-1). They are quickly killing bacterial cells at their MIC (minimal inhibitory concentration). The highest found selectivity HC50 /MIC is more than 20,000 for S. epidermidis. Investigations on sequentially prepared PBIs with defined molecular weight Mn and tailored end groups revealed that there is a dependence of antimicrobial activity and selectivity on Mn and nature of the end groups...
December 2015: Macromolecular Bioscience
https://www.readbyqxmd.com/read/26186499/dynamic-stacking-pathway-of-perylene-dimers-in-aromatic-and-nonaromatic-solvents
#19
Manuel Hollfelder, Stephan Gekle
Using molecular dynamics simulations, we elucidate in detail the dynamics of the π-π stacking process of a perylene bisimide (PBI) dimer solvated in toluene. Our calculations show that the transition from the open (unstacked) to the stacked configuration is hindered by a small free energy barrier of approximately 1kBT in toluene but not in the nonaromatic solvent hexane. A similar effect is observed tor two non-covalently linked monomers. The origin of this barrier is traced back to π-π interactions between perylene and the aromatic solvent which are very similar in nature to those between two PBI monomers...
August 13, 2015: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/25975541/-correlation-between-parameters-on-the-shape-of-body-and-dissatisfaction-against-it-from-parents-among-children-and-adolescents
#20
Lianguo Fu, Haijun Wang, Lili Sun, Yide Yang, Xiaohui Li, Shuo Wang, Xiangkun Meng, Zhenghe Wang, Jun Ma
OBJECTIVE: To analyze the correlation between children and adolescents' body shape parameters and parent's dissatisfaction on it. METHODS: Stratified cluster sampling method was used to select students and their parents, and height, weight, waist circumference (WC), hip circumference (HC), skinfold thichness of the students were measured. Body image from parents was studied through the 'Ma body figural shape'. Correlation between body shape parameters and dissatisfaction towards them from the parents was analyzed under both simple- and multiple-level methods...
April 2015: Zhonghua Liu Xing Bing Xue za Zhi, Zhonghua Liuxingbingxue Zazhi
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