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Julia Tesch, Fabian Paschke, Mikhail Fonin, Marko Wietstruk, Stefan Böttcher, Roland J Koch, Aaron Bostwick, Chris Jozwiak, Eli Rotenberg, Anna Makarova, Beate Paulus, Elena Voloshina, Yuriy Dedkov
The implementation of graphene in semiconducting technology requires precise knowledge about the graphene-semiconductor interface. In our work the structure and electronic properties of the graphene/n-Ge(110) interface are investigated on the local (nm) and macro (from μm to mm) scales via a combination of different microscopic and spectroscopic surface science techniques accompanied by density functional theory calculations. The electronic structure of freestanding graphene remains almost completely intact in this system, with only a moderate n-doping indicating weak interaction between graphene and the Ge substrate...
March 16, 2018: Nanoscale
Zehang Zhou, Weerapha Panatdasirisuk, Tyler S Mathis, Babak Anasori, Canhui Lu, Xinxing Zhang, Zhiwei Liao, Yury Gogotsi, Shu Yang
Free-standing, highly flexible and foldable supercapacitor electrodes were fabricated through the spray-coating assisted layer-by-layer assembly of Ti3 C2 Tx (MXene) nanoflakes together with multi-walled carbon nanotubes (MWCNTs) on electrospun polycaprolactone (PCL) fiber networks. The open structure of the PCL network and the use of MWCNTs as spacers not only limit the restacking of Ti3 C2 Tx flakes but also increase the accessible surface of the active materials, facilitating fast diffusion of electrolyte ions within the electrode...
March 15, 2018: Nanoscale
Huijuan Guo, Xueting Jia, Lu Liu, Xia Cao, Ning Wang, Zhong Lin Wang
Recent development of interactive motion-tracking and positioning technologies is attracting increased interests in the many areas, such as wearable electronics, intelligent electronic and internet of things. For example, the so-called somatosensory technology can afford users strong empathy of immersion and realism due to their consistent interaction with the game. Here, we report a noncontact self-powered positioning and motion-tracking system based on freestanding triboelectric nanogenerator (TENG). The TENG was fabricated by nano-engineered surface in the contact-separation mode with the use of a free moving human body (hands or foot) as the trigger...
March 14, 2018: ACS Nano
Thomas V Brogan, Cary Thurm, Adam L Hersh, Jeffrey S Gerber, Michael J Smith, Samir S Shah, Joshua D Courter, Sameer J Patel, Sarah K Parker, Matthew P Kronman, Brian R Lee, Jason G Newland
OBJECTIVES: To characterize and compare antibiotic prescribing across PICUs to evaluate the degree of variability. DESIGN: Retrospective analysis from 2010 through 2014 of the Pediatric Health Information System. SETTING: Forty-one freestanding children's hospital. SUBJECTS: Children aged 30 days to 18 years admitted to a PICU in children's hospitals contributing data to Pediatric Health Information System. INTERVENTIONS: To normalize for potential differences in disease severity and case mix across centers, a subanalysis was performed of children admitted with one of the 20 All Patient Refined-Diagnosis Related Groups and the seven All Patient Refined-Diagnosis Related Groups shared by all PICUs with the highest antibiotic use...
March 10, 2018: Pediatric Critical Care Medicine
Joseph A Ladapo, Charles E Spritzer, Xuan V Nguyen, Judy Pool, Elvira Lang
PURPOSE: Examine the cost of MRI operations before and after implementation of interpersonal skills training to reduce unanticipated patient-related events in an academic medical center. METHODS: Teams at four MRI sites (two hospital-based, two freestanding) were trained in evidence-based communication skills in February to April 2015. Training was designed to enable staff members to help patients mobilize their innate coping skills in response to any distress they experienced during their MRI visit...
March 9, 2018: Journal of the American College of Radiology: JACR
Arabella L Simpkin, Alisa Khan, Daniel C West, Briana M Garcia, Theodore C Sectish, Nancy D Spector, Christopher P Landrigan
OBJECTIVES: Depression and burnout are highly prevalent among residents, but little is known about modifiable personality variables-such as resilience and stress from uncertainty-that may predispose to these conditions. Residents are routinely faced with uncertainty when making medical decisions. We sought to determine how stress from uncertainty is related to resilience among pediatric residents and whether these attributes are associated with depression and burnout. METHODS: We surveyed 86 residents in pediatric residency programs from four urban freestanding children's hospitals in North America in 2015...
March 7, 2018: Academic Pediatrics
Mahima Bansal, Manisha Sharma, Chris Bullen, Darren Svirskis
We report the fabrication of PEDOT films using vapour phase polymerisation with Fe(III)tosylate as the oxidant and to provide the doping ion. Multiple polymerisation steps resulted in the formation of free-standing PEDOT films. The PEDOT films were highly conductive, a single layer was 1840±50S/cm with a small decrease in conductivity for the five layered films to 1550±60S/cm. The five-layered films were flexible and freestanding in air with a thickness of 1.66±0.06μm. The ability of the freestanding PEDOT films to act as electrically tuneable rate controlling membranes was determined for nicotine (MW 162...
March 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
Laura L McCullough, Zaily Connell, Hua Xin, Vasily M Studitsky, Alexey V Feofanov, Maria E Valieva, Tim Formosa
The essential histone chaperone FAcilitates Chromatin Transcription (FACT) promotes both nucleosome assembly and disassembly. FACT is a heterodimer of Spt16 with either SSRP1 or Pob3, differing primarily by the presence of a high-mobility group B (HMGB) DNA-binding domain furnished only by SSRP1. Yeast FACT lacks the intrinsic HMGB domain found in SSRP1-based homologs such as human FACT, but yeast FACT activity is supported by Nhp6, which is a freestanding, single HMGB domain protein. The importance of histone binding by FACT domains has been established, but the roles of DNA binding activity remain poorly understood...
March 7, 2018: Journal of Biological Chemistry
Matthew DiSalvo, Daniel Harris, Saurin Kantesaria, Alexis N Pena, Jules D Allbritton-King, Jacqueline H Cole, Nancy L Allbritton
Polydimethylsiloxane (PDMS) membranes can act as sensing elements, barriers, and substrates, yet the low rigidity of the elastomeric membranes can limit their practical use in devices. Microraft arrays rely on a freestanding PDMS membrane as a substrate for cell arrays used in imaging cytometry and cellular isolation. However, the underlying PDMS membrane deforms under the weight of the cell media, making automated analytical microscopy (and thus cytometry and cell isolation) challenging. Here we report the development of microfabrication strategies and physically-motivated mathematical modeling of membrane deformation of PDMS microarrays...
March 6, 2018: Analytical Chemistry
Joshua D Roth, Jessica T Casey, Benjamin M Whittam, William E Bennett, Konrad M Szymanski, Mark P Cain, Richard C Rink
OBJECTIVES: To analyze nationwide information on the timing of surgical procedures, cost of surgery, hospital length of stay following surgery and surgical complications of female genital restoration surgery (FGRS) in females with congenital adrenal hyperplasia (CAH). METHODS: We used the Pediatric Health Information System database to identify patients with CAH who underwent their initial FGRS in 2004-2014. These patients were identified by an ICD-9 diagnosis code for adrenogenital disorders (255...
March 2, 2018: Urology
Lawton R Burns, Mark V Pauly
Policy Points: Policymakers seek to transform the US health care system along two dimensions simultaneously: alternative payment models and new models of provider organization. This transformation is supposed to transfer risk to providers and make them more accountable for health care costs and quality. The transformation in payment and provider organization is neither happening quickly nor shifting risk to providers. The impact on health care cost and quality is also weak or nonexistent. In the longer run, decision makers should be prepared to accept the limits on transformation and carefully consider whether to advocate solutions not yet supported by evidence...
March 2018: Milbank Quarterly
Joel E Abbott, Julio G Davalos
Background: Percutaneous nephrolithotomy (PNL) is a procedure that has traditionally been performed in an inpatient or hospital setting. Many surgical procedures have evolved over time from an inpatient/hospital setting to outpatient procedures performed in surgical centers. Outpatient PNL has become an accepted standard in select patients, but to date, the procedure has not been performed in an outpatient surgical center. Case Presentation: We describe our initial experience managing large renal stone burden with PNL performed completely outpatient in a freestanding ambulatory surgery center...
2018: Journal of Endourology Case Reports
Xiaolei Ren, Kostiantyn Turcheniuk, Daniel Lewis, Wenbin Fu, Alexandre Magasinski, Mark W Schauer, Gleb Yushin
Conventional slurry casted electrodes cannot stand high loads or be repeatedly flexed or bent without being fractured, which inhibits their use in flexible batteries. Carbon nanotube (CNT) fabric exhibits a paramount mechanical stability and, due to its porosity, can additionally accommodate an active material within its structure. While solution-based protocols cannot achieve conformal coatings of active materials, chemical vapor deposition (CVD) gives a unique opportunity to control and vary the thickness and homogeneity of the coating...
March 2, 2018: Small
Yu-Fu Ku, Long-Sun Huang, Yi-Kuang Yen
Here, we provide a method and apparatus for real-time compensation of the thermal effect of single free-standing piezoresistive microcantilever-based biosensors. The sensor chip contained an on-chip fixed piezoresistor that served as a temperature sensor, and a multilayer microcantilever with an embedded piezoresistor served as a biomolecular sensor. This method employed the calibrated relationship between the resistance and the temperature of piezoresistors to eliminate the thermal effect on the sensor, including the temperature coefficient of resistance (TCR) and bimorph effect...
February 28, 2018: Biosensors
Stanley A Cohen, Hannah Oloyede
Background and Aims: Patients with a disaccharidase deficiency typically present with abdominal discomfort and often with diarrhea. However, disaccharidase deficiency is often overlooked as a cause of these complaints. Therefore, we sought to determine the prevalence of lactase and sucrase deficiencies in a pediatric population undergoing diagnostic esophagogastroduodenoscopy (EGD) and to describe disaccharidase testing practices among pediatric gastroenterologists. Methods: Endoscopic records from patients undergoing diagnostic EGD and disaccharidase analysis (DA) were retrospectively reviewed...
January 2018: Gastroenterology & Hepatology
Jinqiao Dong, Xu Li, Kang Zhang, Yi Di Yuan, Yuxiang Wang, Linzhi Zhai, Guoliang Liu, Daqiang Yuan, Jianwen Jiang, Dan Zhao
Despite the rapid development of molecular rotors over the past decade, it still remains a huge challenge to understand their confined behaviour in ultrathin two-dimensional (2D) nanomaterials for molecular recognition. Here we report an all-carbon, 2D π-conjugated aromatic polymer, named NUS-25, containing flexible tetraphenylethylene (TPE) units as aggregation induced emission (AIE) molecular rotors. NUS-25 bulk powder can be easily exfoliated into micrometre-sized lamellar freestanding nanosheets with a thickness of 2 - 5 nm...
February 28, 2018: Journal of the American Chemical Society
N Vats, S Rauschenbach, W Sigle, S Sen, S Abb, A Portz, M Dürr, M Burghard, P A van Aken, K Kern
Aberration-corrected high-resolution transmission electron microscopy (AC-HRTEM) has enabled atomically resolved imaging of molecules adsorbed on low-dimensional materials like carbon nanotubes, graphene oxide and few-layer-graphene. However, conventional methods for depositing molecules onto such supports lack selectivity and specificity. Here, we describe the chemically selective preparation and deposition of molecules-like polyoxometalate (POM) anions [PW12 O40 ]3- using electrospray ion-beam deposition (ES-IBD) along with high-resolution TEM imaging...
February 27, 2018: Nanoscale
Xuan Hu, Poya Yasaei, Jacob Jokisaari, Serdar Öğüt, Amin Salehi-Khojin, Robert F Klie
Two-dimensional materials, including graphene, transition metal dichalcogenides and their heterostructures, exhibit great potential for a variety of applications, such as transistors, spintronics, and photovoltaics. While the miniaturization offers remarkable improvements in electrical performance, heat dissipation and thermal mismatch can be a problem in designing electronic devices based on two-dimensional materials. Quantifying the thermal expansion coefficient of 2D materials requires temperature measurements at nanometer scale...
February 2, 2018: Physical Review Letters
Yasmine Yousef, Sabrina Drudi, Ana Maria Sant'Anna, Sherif Emil
INTRODUCTION: Parental presence at induction of general anesthesia (PPI) is highly desired by children and parents. However, it often faces resistance from medical personnel. We conducted a survey evaluating the perceptions of surgeons before and after establishment of a PPI program. METHODS: Internal web-based surveys using Likert Scale questions were administered to all members of a pediatric surgical department before and after the introduction of PPI at a freestanding children's hospital...
January 31, 2018: Journal of Pediatric Surgery
Lara Hilton, Pamela Elfenbaum, Shamini Jain, Meredith Sprengel, Wayne B Jonas
BACKGROUND: The evaluation of freestanding integrative cancer clinical programs is challenging and is rarely done. We have developed an approach called the Claim Assessment Profile (CAP) to identify whether evaluation of a practice is justified, feasible, and likely to provide useful information. OBJECTIVES: A CAP was performed in order to (1) clarify the healing claims at InspireHealth, an integrative oncology treatment program, by defining the most important impacts on its clients; (2) gather information about current research capacity at the clinic; and (3) create a program theory and path model for use in prospective research...
March 2018: Integrative Cancer Therapies
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