Contamination due to memory effects in filtered vacuum arc plasma deposition systems

Thin film synthesis by filtered vacuum arc plasma deposition is a widely used technique with a number of important emerging technological applications. A characteristic feature of the method is that during the deposition process not only is the substrate coated by the plasma, but the plasma gun itself and the magnetic field coil and/or vacuum vessel section constituting the macroparticle filter are also coated to some extent. If then the plasma gun cathode is changed to a new element, there can be a contamination of the subsequent film deposition by sputtering from various parts of the system of the previous coating species. We have experimentally explored this effect and compared our results with theoretical estimates of sputtering from the SRIM (Stopping and Range of Ions in Matter) code. We find film contamination of order 10-4 - 10-3, and the memory of the prior history of the deposition hardware can be relatively long-lasting

Comparing introduction to Europe of highly pathogenic avian influenza viruses A(H5N8) in 2014 and A(H5N1) in 2005

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Adaptive and non-adaptive divergence in a common landscape

Species in a common landscape often face similar selective environments. The capacity of organisms to adapt to these environments may be largely species specific. Quantifying shared and unique adaptive responses across species within landscapes may thus improve our understanding of landscape-moderated biodiversity patterns. Here we test to what extent populations of two coexisting and phylogenetically related fishes—three-spined and nine-spined stickleback—differ in the strength and nature of neutral and adaptive divergence along a salinity gradient. Phenotypic differentiation, neutral genetic differentiation and genomic signatures of adaptation are stronger in the three-spined stickleback. Yet, both species show substantial phenotypic parallelism. In contrast, genomic signatures of adaptation involve different genomic regions, and are thus non-parallel. The relative contribution of spatial and environmental drivers of population divergence in each species reflects different strategies for persistence in the same landscape. These results provide insight in the mechanisms underlying variation in evolutionary versatility and ecological success among species within landscapes

Knowledge and practices of tour guides in Cuzco on the prevention and treatment of traveler's diarrhea

Objectives: To describe the knowledge and practices among tour guides in Cuzco, Peru regarding prevention and treatment of traveler's diarrhea. Methods: The main tour guide association in Cuzco organized a mandatory re-certification course for tour guides in February 2004. We invited tour guides attending this course to participate in the study. Those aged 18 to 50 who had worked as a tour guide for at least one year were asked to complete a brief anonymous questionnaire. Results: A total of 173 questionnaires were returned; 137 met the inclusion criteria and were included in the analysis. The median age was 31 years (interquartile range (IQR): 28-34 years), and 56.7% were male. The median number of foreign languages spoken by subjects included was 1, being English (91.9%) the most common, followed by French (17.9%) and Italian (16.8%). The median time working as a tour guide was 4 years (IQR: 2-8 years). Tour guidance was a full-time job for 47.1% of the subjects, and for 82.4% Inca Trail was the most commonly covered route. Traveler's diarrhea was considered a food-borne disease by 85.4%, but only 60.6% considered it a water-borne disease. The majority of subjects identified raw salads (84.4%), cold sauces (81.5%) and tap water (81.1%) as risky products whereas hot soups (77 8%) and bread (75.0%) were mainly considered as safe. Most of the tour guides considered bloody stools (84.8%) and fever (60.6%) as indications to seek medical attention. The medications most frequently recommended by tour guides were oral re-hydration solutions ( 85.1%), trimethoprim-sulphamethoxazole (26.1%) and loperamide (20.1%). Conclusions: Tour guides have a basic knowledge about traveler's diarrhea. However, more training is necessary to improve management while trekking outside of Cuzco The recommendation to seek pharmacists should be particularly addressed

The impact of the COVID-19 pandemic on health-related quality of life in head and neck cancer survivors:An observational cohort studs

Objective: To investigate the impact of the COVID-19 pandemic on physical, psychological, and social aspects of health-related quality of life (HRQOL) among head and neck cancer (HNC) survivors. Materials and methods: Prospectively collected data from the NETherlands QUality of life and BIomedical Cohort study in HNC were used. All patients were diagnosed and treated before the COVID-19 pandemic. Patient reported outcome measures (PROMs) collected 24 and 36 months after treatment (M24 and M36) were compared between survivors who completed both assessments before the COVID-19 pandemic and those who completed M24 before but M36 during the pandemic. Personal, clinical, physical, psychological, social, and lifestyle characteristics of the survivors assessed at baseline or M24 were investigated as potential effect modifiers. Results: In total, 318 HNC survivors were included, of which 199 completed both M24 and M36 before the COVID-19 pandemic and 119 completed M24 before but M36 during the pandemic. Changes in HRQOL between 24 and 36 months follow-up did not differ between the two groups for any of the PROMs. Nevertheless, in some subgroups of HNC survivors the COVID-19 pandemic negatively affected the course of HRQOL for several PROMs while it positively affected the course of HRQOL for other PROMs. Conclusions: The COVID-19 pandemic did not affect HRQOL in HNC survivors in general, but some subgroups were affected in a positive and others in a negative way.</p

Assessment of exposure determinants and exposure levels by using stationary concentration measurements and a probabilistic near-field/far-field exposure model

Background: The Registration, Evaluation, Authorization and Restriction of Chemicals (REACH) regulation requires the establishment of Conditions of Use (CoU) for all exposure scenarios to ensure good communication of safe working practices. Setting CoU requires the risk assessment of all relevant Contributing Scenarios (CSs) in the exposure scenario. A new CS has to be created whenever an Operational Condition (OC) is changed, resulting in an excessive number of exposure assessments. An efficient solution is to quantify OC concentrations and to identify reasonable worst-case scenarios with probabilistic exposure modeling. Methods: Here, we appoint CoU for powder pouring during the industrial manufacturing of a paint batch by quantifying OC exposure levels and exposure determinants. The quantification was performed by using stationary measurements and a probabilistic Near-Field/Far-Field (NF/FF) exposure model. Work shift and OC concentration levels were quantified for pouring TiO 2 from big bags and small bags, pouring Micro Mica from small bags, and cleaning. The impact of exposure determinants on NF concentration level was quantified by (1) assessing exposure determinants correlation with the NF exposure level and (2) by performing simulations with different OCs. Results: Emission rate, air mixing between NF and FF and local ventilation were the most relevant exposure determinants affecting NF concentrations. Potentially risky OCs were identified by performing Reasonable Worst Case (RWC) simulations and by comparing the exposure 95 th percentile distribution with 10% of the occupational exposure limit value (OELV). The CS was shown safe except in RWC scenario (ventilation rate from 0.4 to 1.6 1/h, 100 m 3 room, no local ventilation, and NF ventilation of 1.6 m 3/min). Conclusions: The CoU assessment was considered to comply with European Chemicals Agency (ECHA) legislation and EN 689 exposure assessment strategy for testing compliance with OEL values. One RWC scenario would require measurements since the exposure level was 12.5% of the OELV

Changes in supportive care needs over time from diagnosis up to two years after treatment in head and neck cancer patients:A prospective cohort study

Objectives: To investigate changes in supportive care needs (SCNs) over time from diagnosis up to 2 years after treatment among head and neck cancer (HNC) patients, in relation to demographic, personal, clinical, psychological, physical, social, lifestyle, and cancer-related quality of life factors.Materials and methods: Data of the longitudinal NETherlands QUality of Life and Biomedical Cohort study (NET-QUBIC) was used. SCNs were measured using the Supportive Care Needs Survey (SCNS-SF34) and HNC-specific module (SCNS–HNC) before treatment, three, six, 12 and 24 months after treatment. Linear mixed model analyses were used to study SCNs on the physical &amp; daily living (PDL), psychological (PSY), sexuality (SEX), health system, information and patient support (HSIPS), HNC-functioning (HNC-Function), and lifestyle (HNC-Lifestyle) domain, in relation to demographic, personal, clinical, psychological, physical, social, lifestyle, and cancer-related symptoms as measured at baseline.Results: In total, 563 patients were included. SCNs changed significantly over time. At baseline, 65% had ≥1 moderate/high SCN, versus 42.8% at 24 months. Changes in PDL needs were associated with gender, tumor location, smoking, fear of cancer recurrence, oral pain, and appetite loss, changes in PSY with tumor location, fear of recurrence, social support, emotional functioning, physical functioning, coughing, and use of painkillers, changes in SEX with treatment, changes in HSIPS with muscle strength, changes in HNC-Function with tumor stage, location, social support, physical functioning, fatigue, nausea and vomiting, and speech problems, and changes in HNC-Lifestyle with smoking and alcohol use.Conclusion: SCNs diminish over time, but remain prevalent in HNC patients.</p