Chamber bioaerosol study: human emissions of size-resolved fluorescent biological aerosol particles.

Humans are a prominent source of airborne biological particles in occupied indoor spaces, but few studies have quantified human bioaerosol emissions. The chamber investigation reported here employs a fluorescence-based technique to evaluate bioaerosols with high temporal and particle size resolution. In a 75-m(3) chamber, occupant emission rates of coarse (2.5-10 µm) fluorescent biological aerosol particles (FBAPs) under seated, simulated office-work conditions averaged 0.9 ± 0.3 million particles per person-h. Walking was associated with a 5-6× increase in the emission rate. During both walking and sitting, 60-70% or more of emissions originated from the floor. The increase in emissions during walking (vs. while sitting) was mainly attributable to release of particles from the floor; the associated increased vigor of upper body movements also contributed. Clothing, or its frictional interaction with human skin, was demonstrated to be a source of coarse particles, and especially of the highly fluorescent fraction. Emission rates of FBAPs previously reported for lecture classes were well bounded by the experimental results obtained in this chamber study. In both settings, the size distribution of occupant FBAP emissions had a dominant mode in the 3-5 µm diameter range.

Progress in thermal comfort research over the last twenty years.

Climate change and the urgency of decarbonizing the built environment are driving technological innovation in the way we deliver thermal comfort to occupants. These changes, in turn, seem to be setting the directions for contemporary thermal comfort research. This article presents a literature review of major changes, developments, and trends in the field of thermal comfort research over the last 20 years. One of the main paradigm shift was the fundamental conceptual reorientation that has taken place in thermal comfort thinking over the last 20 years; a shift away from the physically based determinism of Fanger's comfort model toward the mainstream and acceptance of the adaptive comfort model. Another noticeable shift has been from the undesirable toward the desirable qualities of air movement. Additionally, sophisticated models covering the physics and physiology of the human body were developed, driven by the continuous challenge to model thermal comfort at the same anatomical resolution and to combine these localized signals into a coherent, global thermal perception. Finally, the demand for ever increasing building energy efficiency is pushing technological innovation in the way we deliver comfortable indoor environments. These trends, in turn, continue setting the directions for contemporary thermal comfort research for the next decades.

[Stigmatization of patients with schizophrenia: the influence of university courses on the attitudes of prospective psychologists and doctors]. / Stigmatisierung von Patienten mit Schizophrenie: Prägt das Studium die Einstellungen angehender Psychologen und Mediziner?

BACKGROUND: Some studies revealed that psychiatrists have more negative attitudes than psychologists towards patients with schizophrenia. This raises the question of whether different models of the aetiology of schizophrenia and the amount of personal contact influence the attitudes of mental health professionals. SAMPLE AND METHODS: Explicit and implicit attitudes towards schizophrenia were assessed in medical and psychology students (n=60 and n=61, respectively) as well as their familiarity with the disorder and their subjective models of its aetiology. RESULTS: Medical and psychology students showed a substantial level of negative attitudes. Personal contact was negatively associated with stereotypes among medical students and positively associated among psychology students. Positive attitudes were related to biogenetic causal beliefs among medical students and to psychosocial causal beliefs among psychology students. CONCLUSIONS: The results emphasise the need to adapt antistigma campaigns to target groups. They also indicate the superiority of a multidimensional aetiology over monocausal aetiological models in reducing stigma.

The perils of aiming too high: Discrepancy between goals and performance in individuals with depressive symptoms.

BACKGROUND AND OBJECTIVES: Negative evaluation processes play a pivotal role in the development and maintenance of depressive symptoms. However, it remains to be understood, whether evaluation processes in depression are impaired by maladaptive goal setting. METHOD: In a non-clinical sample (N = 50) of individuals with high (BDI-II-Score: 13-29) and low (BDI-II-Score: 0-3) levels of depressive symptoms goal setting prior to working on a cognitive task was measured. Goal feasibility was experimentally manipulated using an easy and a difficult version of the task. RESULTS: When goal feasibility was low, a high level of depressive symptoms was associated with setting unattainable goals. Whereas individuals with low level of depressive symptoms adjusted their goals to a lower (more realistic) level when task difficulty increased, individuals with high level of depressive symptoms initially adhered to significantly higher goals, so that their performance failed to meet their self-set standards. After depressed individual revised their goals downwards, their subsequent performance on the task also worsened. LIMITATIONS: The use of a non-clinical sample with self-reported depressive symptoms limits the generalizability of our findings to a clinical population. Future research would benefit from the use of a larger sample with patients suffering from clinical depression. CONCLUSIONS: The findings support the notion that negative evaluation processes in depressed individuals might be linked with their tendency to generate intractable conflicts between self-set inappropriate high goals and their own capacities to perform. However, the findings need to be confirmed in clinical samples to draw conclusions about the role of goal setting in negative evaluation processes in depression.