a b s t r a c tAir cleaning techniques have been applied worldwide with the goal of improving indoor air quality. The effectiveness of applying these techniques varies widely, and pollutant removal efficiency is usually determined in controlled laboratory environments which may not be realized in practice. Some air cleaners are largely ineffective, and some produce harmful by-products. To summarize what is known regarding the effectiveness of fan-driven air cleaning technologies, a state-of-the-art review of the scientific literature was undertaken by a multidisciplinary panel of experts from Europe, North America, and Asia with expertise in air cleaning, aerosol science, medicine, chemistry and ventilation. The effects on health were not examined. Over 26,000 articles were identified in major literature databases; 400 were selected as being relevant based on their titles and abstracts by the first two authors, who further reduced the number of articles to 160 based on the full texts. These articles were reviewed by the panel using predefined inclusion criteria during their first meeting. Additions were also made by the panel. Of these, 133 articles were finally selected for detailed review. Each article was assessed independently by two members of the panel and then judged by the entire panel during a consensus meeting. During this process 59 articles were deemed conclusive and their results were used for final reporting at their second meeting. The conclusions are that: (1) None of the reviewed technologies was able to effectively remove all indoor pollutants and many were found to generate undesirable by-products during operation. (2) Particle filtration and sorption of gaseous pollutants were among the most effective air cleaning technologies, but there is insufficient information regarding long-term performance and proper maintenance. (3) The existing data make it difficult to extract information such as Clean Air Delivery Rate (CADR), which represents a common benchmark for comparing the performance of different air cleaning technologies. (4) To compare and select suitable indoor air cleaning devices, a labeling system accounting for characteristics such as CADR, energy consumption, volume, harmful by-products, and life span is Atmospheric Environment 45 (2011) 4329e4343 necessary. For that purpose, a standard test room and condition should be built and studied. (5) Although there is evidence that some air cleaning technologies improve indoor air quality, further research is needed before any of them can be confidently recommended for use in indoor environments.

Food insecurity affects individuals' dietary intakes, but there have been few direct examinations of changes in individuals' intakes in the context of declining resources. This study examined changes in dietary intake over 30 d following the receipt of income in a sample of low-income, predominantly food-insecure women with children. Data on 182 women who received the bulk of their income in 1 monthly check were drawn from 2 Canadian studies. Equivalent 30-d measures of adult food security were constructed from participants' responses to items on the Radimer-Cornell questionnaire or the U.S. Household Food Security Survey Module. Intake data from multiple 24-h dietary recalls collected over 1 mo were merged. Mixed linear models were used to examine relationships between women's energy, nutrient, and food intakes and the depletion in household resources over 30 d, as indicated by days since the receipt of the household's major source of income. Women's intakes of energy, milk products, and vegetables decreased significantly as the time since they received income increased. When their food security status was considered, women who were food secure or marginally insecure showed no significant within-month patterns, but significant declines in energy, carbohydrate, vitamin B-6, and fruit and vegetable intake were observed for women with moderate or severe adult food insecurity. The food intakes of women in deprived circumstances are sensitive to the decline in household resources following the receipt of a monthly check.

This study was undertaken to characterize nutritional vulnerability among a sample of homeless youth in downtown Toronto. Interviews were conducted with 261 homeless youth (149 male, 112 female), recruited from drop-in centers and outdoor locations. Information about current living circumstances, nutrition and health-related behaviors, and 24-h dietary intake recalls were collected, and height, weight, triceps skinfold thickness, and mid-upper arm circumference were measured. A second 24-h dietary intake recall was conducted with 195 youth. Youth's energy intakes approximated the requirements for a very sedentary lifestyle; 7% were underweight and 22% were overweight or obese. Over half of the youth had inadequate intakes of folate, vitamin A, vitamin C, magnesium, and zinc; in addition, more than half of females had inadequate vitamin B-12 and iron intakes. Most youth got food from more than one source in the course of a day: 74% of males and 75% of females purchased food; 48% of males and 51% of females obtained food from charitable meal programs; 47% of males and 75% of females received food from strangers or acquaintances; and 10% of males and 6% of females stole food or took it from the garbage. Compared to a sample of 114 domiciled youth from the 1997-1998 Ontario Food Survey, males had lower energy and nutrient intakes and females had lower intakes of most nutrients.

No abstract

No abstract

The glutamatergic system has previously been shown to be involved in the pathophysiology of schizophrenia and the mechanisms of action of antipsychotic treatment. The present study aimed to investigate the relationship between the levels of glutamate (Glu) or Glu/total creatine (Glu/Cr+PCr) in the anterior cingulate cortex (ACC) and psychiatric symptoms as well as the response to antipsychotic treatment. We performed proton magnetic resonance spectroscopy (1 H-MRS) to measure Glu and Glu/Cr+PCr in the ACC of 35 drug-naïve first-episode schizophrenia (FES) patients and 40 well-matched healthy controls (HCs). After scanning, we treated the patients with risperidone for eight weeks. Remission status was based on the Positive and Negative Syndrome Scale (PANSS) scores at week 8. At baseline, there were no significant differences in the levels of Glu or Glu/Cr+PCr in the ACC between drug-naïve FES patients and HCs. Lower baseline levels of Glu/Cr+PCr but not Glu in the ACC were associated with more severe negative symptoms of schizophrenia. Compared to the remission group (RM), the non-remission group (NRM) had lower baseline ACC Glu levels (P < 0.05). Our results suggest that ACC Glu levels may be related to the severity of symptoms in the early stages of schizophrenia and therefore may be a marker with which to evaluate the treatment effect of antipsychotics in schizophrenia patients.

No abstract

No abstract