Peat swamp runoff, rich of humic substances, was collected from Asa Jaya Vicinity.
The black substance was collected aseptically by scraping the substance into a 2-mL cryovial and frozen in liquid nitrogen in the field.
In 2006 New York City Transit found that a black tacky substance was collecting in the diesel storage tanks at its bus depots and fouling the lines at its fuel pumps.
Demographic information and duration of psychosis and substance misuse were collected at baseline via self report.
Demographic data and a self-reported medical history with respect to hypertension, diabetes, cardiovascular disease, exercise habits, and substance exposure were collected.
Data on socio-demographic characteristics, depression, stress, and substance use were collected in classroom-administered or mailed self-report questionnaires completed by 1025 of the 1631 original participants (63%).
Data across a range of domains (including sociodemographic characteristics, socioeconomic status, physical and mental health, adversity and life events in childhood and adulthood and substance use) were collected using a computer-assisted interview schedule, which was piloted to establish reliability, validity and feasibility prior to the start of the main survey.
Data on lifetime stress or worry about common life events/difficulties (i.e., romantic breakups, family disruption, interpersonal difficulties, and personal stress (health, weight, school work)), symptoms of depression, conduct disorder symptoms, and substance use were collected from 1025 grade 7 students (mean age 12.9 years; 45% male).
All substance use data were collected at baseline and at each follow-up wave.
