Adsorption of atomic oxygen (N2O) on a clean Si(100) surface and its influence on the surface state density; A comparison with O2

This paper describes a study concerning the interaction of molecular oxygen (O2) and nitrous oxide (N2O) with the clean Si(100) 2 × 1 surface in ultrahigh vacuum at 300 K. Differential reflectometry (DR) in the photon energy range of 1.5¿4.5 eV, Auger electron spectroscopy (AES) and low energy electron diffraction (LEED) have been used to monitor these solid-gas reactions. With this combination of techniques it is possible to make an analysis of the (geometric and electronic) structure and chemical composition of the surface layer. The aim of the present study was to give a description of the geometric nature of the oxygen covered Si(100) surface. For that purpose we have used both molecular (O2) and atomic oxygen (as released by decomposition of N2O) to oxidize the clean Si(100)2 × 1 surface

The optimization of differential reflectometry at surfaces of transparent crystals

The first-order difference in reflectivity of crystals surfaces due to the adsorption of a (sub)monolayer is calculated for crystals transparent to the incident radiation. Conditions are derived for optimizing experimental studies of both strongly and weakly absorbing surfaces and/or adsorbates. The large and small absorption bandwidths involved correspond respectively to (i) electronic transitions to/from surface, interface and adsorbate states, and, (ii) vibrational excitations of adsorbates. The variable parameters are the angle of the incident light beam and the state of the back surface. It is found that the sensitivity varies with angle of incidence, depending on the type of absorbing monolayer

Characterizing the fungal and bacterial microflora and concentrations in fitness centres

Fitness centres are special places where conditions for microbiological proliferation should be considered. Moisture due to human perspiration and water condensation as a result of human physical activities are prevalent in this type of buildings. Exposure to microbial contaminants is clinically associated with respiratory disorders and people who work out in polluted environments would be susceptible to contaminants. This work studied the indoor air contamination in three gymnasiums in Lisbon. The sampling was performed at two periods: at the opening (morning) and closing (night) of the three gymnasiums. The airborne bacterial and fungal populations were sampled by impaction directly onto Tryptic Soy Agar (for bacteria) and Malt Extract Agar (for fungi) plates, using a Merck MAS-100 air sampler. Higher bacterial concentrations were found at night as compared to the morning but the same behaviour was not found for fungal concentrations. Gram-negative catalase positive cocci were the dominant bacteria in indoor air samples of the studied gymnasiums. In this study, 21 genera/species of fungal colonies were identified. Chrysosporium sp., Chrysonilia sp., Neoscytalidium hialinum, Sepedonium sp. and Penicillium sp. were the most prevalent species identified in the morning, while Cladosporium sp., Penicillium sp., Chrysosporium sp., Acremonium sp. and Chrysonilia sp. were more prevalent at night. A well-designed sanitation and maintenance program for gymnasiums is needed to ensure healthier space for indoor physical activity

Using patient experience in optimizing the total knee arthroplasty patient journey

Information was used to improve the patient journey and to achieve patient-centered care. Patients (\u3e18 years, purposive sampling) were interviewed once at one point of their total knee arthrosis journey within the hospital setting. Patients were accompanied and observed during their hospital visit by one of the 19 healthcare professionals which were trained as interviewers. A qualitative research approach with in-depth and semi-structured interviews using a standardized interview guide were used to gather an in-depth understanding of the perceptions of patients. Interviews were written out with the emphasis on positive and negative feedback, quotes and observations that were made. The audio recordings were verbatim transcribed and coded using selective and open coding. Thirty-five semi-structured interviews were conducted. Five different themes were identified: overall experience, waiting, communication, information and facilities. Several easy fixes were dealt with immediately to improve service quality, productivity and the organization of the healthcare service. Other improvements were discussed with the stakeholders and were resolved directly or were planned for the long-term. Involving patients and let them collaborate with healthcare professionals is essential in optimizing patient-centered care. Most feedback was related to clarification and comprehensibility of the patient journey, to improve autonomy and to remove uncertainty of the patients. Continuity of care with medical personnel, personal attention and recognition of the problem are fundamental during the knee arthrosis patient journey. Experience Framework This article is associated with the Quality & Clinical Excellence lens of The Beryl Institute Experience Framework. (http://bit.ly/ExperienceFramework) Access other PXJ articles related to this lens. Access other resources related to this lens

Architecture handbook

2002 handbook for the Faculty of Architectur

Delay and Impairment in Brain Development and Function in Rat Offspring After Maternal Exposure to Methylmercury

Maternal exposure to the neurotoxin methylmercury (MeHg) has been shown to have adverse effects on neural development of the offspring in man. Little is known about the underlying mechanisms by which MeHg affects the developing brain. To explore the neurodevelopmental defects and the underlying mechanism associated with MeHg exposure, the cerebellum and cerebrum of Wistar rat pups were analyzed by [F-18]FDG PET functional imaging, field potential analysis, and microarray gene expression profiling. Female rat pups were exposed to MeHg via maternal diet during intrauterinal and lactational period (from gestational day 6 to postnatal day (PND)10), and their brain tissues were sampled for the analysis at weaning (PND18-21) and adulthood (PND61-70). The [F-18]FDG PET imaging and field potential analysis suggested a delay in brain activity and impaired neural function by MeHg. Genome-wide transcriptome analysis substantiated these findings by showing (1) a delay in the onset of gene expression related to neural development, and (2) alterations in pathways related to both structural and functional aspects of nervous system development. The latter included changes in gene expression of developmental regulators, developmental phase associated genes, small GTPase signaling molecules, and representatives of all processes required for synaptic transmission. These findings were observed at dose levels at which only marginal changes in conventional developmental toxicity endpoints were detected. Therefore, the approaches applied in this study are promising in terms of yielding increased sensitivity compared with classical developmental toxicity tests

Corruption in the Middle East and the Limits of Conventional Approaches

Die Unzufriedenheit mit der verbreiteten Korruption war 2011/2012 eine wesentliche Ursache für die arabischen Unruhen und weitere Aufstände weltweit. Der Fall Jordanien zeigt allerdings, dass konventionelle Ansätze zur Bekämpfung von Korruption nicht ausreichen. Eine angemessene Strategie gegen Korruption muss diese als ein Problem der Verteilungsgerechtigkeit und nicht des Strafrechts verstehen. Wie in allen anderen arabischen Staaten ist die Unzufriedenheit in der Bevölkerung über die offensichtliche Korruption auch in Jordanien beträchtlich. Allerdings wird im Allgemeinen nicht über Fälle von Bestechung und Erpressung geklagt, die weniger häufig vorkommen, sondern über lokale Praktiken politischer Patronage und Begünstigung, die unter dem Begriff "Wasta" zusammengefasst werden. "Wasta" wurde bislang als Form der Korruption und strafrechtliches Problem angesehen, weshalb Versuche zur Eindämmung überwiegend ineffizient blieben: "Wasta"-Praktiken werden in der Regel nicht mit Rechtsverstößen verbunden, sondern bewegen sich innerhalb formal legaler Verfahren. Konventionelle Ansätze zur Bekämpfung von Korruption, die sich an rechtsstaatlichen Grundsätzen und Transparenz orientieren, sind deshalb nicht zielführend. Demokratisierung allein ist ebenfalls ungeeignet, das Problem „Wasta” zu lösen. In der parlamentarischen Praxis macht "Wasta" den Großteil der Aktivitäten aller Parlamentsmitglieder aus. Diese werden deshalb als persönliche Dienstleister für ihre Wahlbezirke und nicht als Mitglieder einer gesetzgebenden Körperschaft wahrgenommen. Gleichzeitig hält die Bevölkerung das Parlament für eine zutiefst korrupte Institution. "Wasta" wird problematisch, wenn diese Praxis zu einem ungleichen Zugang der Bürger zu öffentlichen Ressourcen führt. Statt sich nur auf politische und administrative Reformen zu konzentrieren, muss der Fokus der Bekämpfung auf den (Wieder-)Aufbau wohlfahrtsstaatlicher Strukturen gelegt werden, zu denen alle Bürger gleichermaßen Zugang haben

New function of the myostatin/activin type I receptor (ALK4) as a mediator of muscle atrophy and muscle regeneration

Skeletal muscle fibrosis and impaired muscle regeneration are major contributors to muscle wasting in Duchenne muscular dystrophy (DMD). Muscle growth is negatively regulated by myostatin (MSTN) and activins. Blockage of these pathways may improve muscle quality and function in DMD. Antisense oligonucleotides (AONs) were designed specifically to block the function of ALK4, a key receptor for the MSTN/activin pathway in skeletal muscle. AON-induced exon skipping resulted in specific Alk4 down-regulation, inhibition of MSTN activity, and increased myoblast differentiation in vitro Unexpectedly, a marked decrease in muscle mass (10%) was found after Alk4 AON treatment in mdx mice. In line with in vitro results, muscle regeneration was stimulated, and muscle fiber size decreased markedly. Notably, when Alk4 was down-regulated in adult wild-type mice, muscle mass decreased even more. RNAseq analysis revealed dysregulated metabolic functions and signs of muscle atrophy. We conclude that ALK4 inhibition increases myogenesis but also regulates the tight balance of protein synthesis and degradation. Therefore, caution must be used when developing therapies that interfere with MSTN/activin pathways