A Comparative Cancer Risk Evaluation of MTBE and Other Compounds (Including Naturally Occurring Compounds) in Drinking Water in New Hampshire

Methyl tert-butyl ether (MTBE) was added to gasoline in New Hampshire (NH) between 1995 and 2006 to comply with the oxygenate requirements of the 1990 Amendments to the Clean Air Act. Leaking tanks and spills released MTBE into groundwater, and as a result, MTBE has been detected in drinking water in NH. We conducted a comparative cancer risk assessment and a margin-of-safety (MOS) analysis for several constituents, including MTBE, detected in NH drinking water. Using standard risk assessment methods, we calculated cancer risks from exposure to 12 detected volatile organic compounds (VOCs), including MTBE, and to four naturally occurring compounds (i.e., arsenic, radium-226, radium-228, and radon-222) detected in NH public water supplies. We evaluated exposures to a hypothetical resident ingesting the water, dermally contacting the water while showering, and inhaling compounds volatilizing from water in the home. We then compared risk estimates for MTBE to those of the other 15 compounds. From our analysis, we concluded that the high-end cancer risk from exposure to MTBE in drinking water is lower than the risks from all the other VOCs evaluated and several thousand times lower than the risks from exposure to naturally occurring constituents, including arsenic, radium, and radon. We also conducted an MOS analysis in which we compared toxicological points of departure to the NH maximum contaminant level (MCL) of 13 µg/L. All of the MOSs were greater than or equal to 160,000, indicating a large margin of safety and demonstrating the health-protectiveness of the NH MCL for MTBE.     

让法官告诉你怎样当邻居

在国外居住的时间长了,一个重要的问题便是融入那个国家的生活。这话说起来容易,做起来就太难了。我那时在纽芬兰读书。当时房子很便宜,作为一种投资,我也买了一幢房子。但是,跟邻居的交往一直仅限于见面时打个招呼。我也尝试着跟邻居们更密切些,但是,我语言不好,又没有太多的时间。     

People and Pixels 20 years later: the current data landscape and research trends blending population and environmental data

Population and Environment - In 1998, the National Research Council published People and Pixels: Linking Remote Sensing and Social Science. The volume focused on emerging research linking changes...     

Are Life Insurance Holdings Related to Financial Vulnerabilities?

Using the 1995 Survey of Consumer Finances and an elaborate life-cycle model, we quantify the potential financial impact of each individual's death on his or her survivors and measure the degree to which life insurance moderates these consequences. Life insurance is essentially uncorrelated with financial vulnerability at every stage of the life cycle. As a result, the impact of insurance among at-risk households is modest, and substantial uninsured vulnerabilities are widespread, particularly among younger couples. We also identify a systematic gender bias: For any given level of financial vulnerability, couples provide significantly more protection for wives than for husbands. (JEL D10 , G22 )     

Young Children's Affective Responses to Acceptance and Rejection From Peers: A Computer‐based Task Sensitive to Variation in Temperamental Shyness and Gender

This study presents a novel task examining young children's affective responses to evaluative feedback—specifically, social acceptance and rejection—from peers. We aimed to determine (1) whether young children report their affective responses to hypothetical peer evaluation predictably and consistently, and (2) whether young children's responses to peer evaluation vary as a function of temperamental shyness and gender. Four‐ to seven‐year‐old children (N = 48) sorted pictures of unknown, similar‐aged children into those with whom they wished or did not wish to play. Computerized peer evaluation later noted whether the pictured children were interested in a future playdate with participants. Participants then rated their affective responses to each acceptance or rejection event. Children were happy when accepted by children with whom they wanted to play, and disappointed when these children rejected them. Highly shy boys showed a wider range of responses to acceptance and rejection based on initial social interest, and may be particularly sensitive to both positive and negative evaluation. Overall, the playdate task captures individual differences in affective responses to evaluative peer feedback and is potentially amenable to future applications in research with young children, including pairings with psychophysiological measures.     

The History of College Health Nursing

Abstract

Almost from the beginning of formal college health programs in the second half of the 19th century, college health nurses were there to care for students in college and university settings. By the end of the 20th century, the role of college health nurses had evolved with the nursing field in general, but with enough unique features for the American Nurses’ Credentialing Center to recognize college health nursing as a professional subspecialty and administer the first College Health Nurse Certification examinations. In addition, new nurse practitioner programs provided practicing nurses with more independence, and their duties continued to expand beyond care of the sick to include health promotion, administrative, and teaching activities. As a result of these changes, college health nurses now play a larger role in the life of students and promoting a healthy campus community than ever before in the history of college health.