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继2007年建议(第103号出版物)之后,ICRP在第110号出版物(2009年)和第143号出版物(2020年)中发布了用于剂量系数计算的体素参考计算体模(VRCPs)系列。 基于真人CT图像的VRCPs改进了解剖学和剂量学,而不是在2007年建议之前用于剂量系数计算的老式数学(或风式化)体模。然而,这种由体素大小固定的体素组成的体素体模在表示某些解剖结构,特别是那些比体素尺寸更小或更薄的体素体...
Every fall, more than half the coho salmon that return to Puget Sound's urban streams die before they can spawn. In some streams, all die. But scientists didn't know why.Now, a U.S. National Scie...
Very little is known about how the onset of puberty is controlled in humans, but an NSF-funded discovery of a new gene in the roundworm C. elegans could be the "missing link" that determines the juven...
State policies requiring children to attend additional years of school may result in a reduced risk of heart disease and improvements in cardiovascular risk factors in adulthood, according to a study ...
This research explores the use of PM2.5 gird derived from remote sensing for assessing the effect of long-term exposure to PM2.5 (ambient air pollution of particulate matter with an aerodynamic diamet...
Purpose: Because reading is an audiovisual process, reading impairment may reflect an audiovisual processing deficit. The aim of the present study was to test the existence and scope of such a deficit...
Background: Genes and the environment contribute to variation in adult body mass index [BMI (in kg/m2)], but factors modifying these variance components are poorly understood.
Background: Adult height has shown directionally diverse associations with several age-related disorders, including cardiovascular disease, cancer, decline in cognitive function, and mortality.
Purpose Glucose abnormality and diabetes are the most common comorbidities in cystic fibrosis (CF). Combined (aerobic and resistance) exercise program in type 2 patients with diabetes demonstrated an ...
Background: Multivitamin/mineral products (MVMs) are the dietary supplements most commonly used by US adults. During manufacturing, some ingredients are added in amounts exceeding the label claims to ...
Background: It has been widely recognized that parental dietary intake is an important and consistent factor influencing children’s food intake. However, there are conflicting results with regard to t...
Adult epithelia regenerate during adult life due to the constant activity of stem cell pools. Stem cells maintain tissue homeostasis and repair injury by close communication with their tissue environm...
The effects of dietary fructooligosaccharide (FOS) and dietary mannitol on the absorption of Ca and Mg in a short term feeding trial were studied. Adult Wistar rats were divided into three groups and ...
Columbia scientists have found that spikes in the activity of neurons in young mice do not spur corresponding boosts in blood flow — a discovery that stands in stark contrast to the adult mouse brain....

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