BACKGROUND Vitamin D is an important factor in human health. Yet, vitamin D deficiency is very common. We aimed to confirm serum 25-hydroxyvitamin D (25OHD) concentration change after sunlight exposure and to elucidate the relationship between the amount of sunlight exposure and serum 25OHD level change by ambulatory lux meter and sunlight exposure questionnaire. METHODS Twenty healthy young ...

OBJECTIVES Suicide rates have widely been reported to peak in spring and summer. A frequent hypothesis is that increased sunlight exposure alters biological mechanisms. However, few attempts have been made to systematically untangle the putative suicidogenic risk of sunlight exposure from that of seasonality. We examined whether average hours of daily sunlight in a month confer additional risk ...

BACKGROUND A limited number of studies suggest that ambient temperature contributes to suicide; these studies typically focus on a single nation and use temporally and spatially aggregated data. OBJECTIVE We evaluated the association between ambient temperature and suicide in multiple cities in three East Asian countries. METHODS A time-stratified case-crossover method was used to explore t...

Water and sunlight are the cleanest, most renewable, abundant resources on Earth. Developing inexpensive, scalable photocatalysts that highly stable for hydrogen (H2) production has long been a cherished dream of humanity. Herein, we report one-dimensional lepidocrocite-based sub-nanofilaments (NFs), ≈ 5 × 7 Å2 in cross-section, generate H2 from 80:20 v/v water/methanol mixtures when illuminate...

Semiconductor photocatalytic performances can be modulated through morphology modification. Herein porous hierarchical BiOBr microspheres (BiOBr-MS) of ~3 μm was firstly self-assembled without the assistance a template via facile solvothermal synthesis in triethylene glycol (TEG) at 150 °C for 3 h. KBrO3 exploited as bromine source, which slowly provided bromide ions upon reduction TEG and cont...

Several reports indicate that suicide follows a seasonal pattern with a dominant peak during the month of maximum daylight. The purpose of this study was to evaluate the hypothesis that sunshine exposure may trigger suicidal behavior. We found a remarkably consistent pattern of seasonality with peak incidence around June in the northern hemisphere and December in the southern hemisphere. Moreov...