Age differences

Although these impairments in the performance of older personnel can be the result of biological changes due to age, the level of experience with the job may counteract these changes. Continual practice of a particular job role may cause these age differences to disappear. In addition, older personnel may develop more efficient methods of work and thus minimize the demands of the job. 

Griew, S., Tucker, W. A. (1958). The Identification of Job Activities Associated with Age Differences in the Engineering Industry. Journal of Applied Psychology 42,278. 

Human bone strontium levels (Fig. 1.5) are within the range that is expeeted for that region (Katzenberg 1984). The sample size is small and uneven with only three females and one subadult so it is not possible to comment on sex or age differences except to say that the highest Sr content was found in the sample from a child aged around 9 2 years. 

Sex and age differences in stable isotopes of nitrogen and carbon are not pronounced. There is no evidence that males and females were eating different foods and the only evidence for age differences, higher 8 N in infants, has been explained by the trophic level shift during the time the infant derives most of its protein from, breast milk. The small amount of variation in both and 5 N values supports the historical sources, which indicate that while food was plentiful, the diet was rather monotonous. 

Katzenberg, M.A., Saunders, S.R. and Fitzgerald, W.R. 1993 Age differences in stable carbon and nitrogen isotope ratios in a population of prehistoric maize horticulturists. American Journal of Physical Anthropology 90 267-281. 

First, a food quahty relationship model has been developed. It considers food quahty (FQ) to be dependent on food behavior (FB) and human behavior (HB). FB is a function of food dynamics (FD) (such as variable pigment concentrations and differing color degradahon prohles) and apphed technological conditions (TCs) (such as oxygen control to maintain color concentrahons). Likewise, HB is a function of human dynamics (HD) (for example, varying color perceptions due to age differences), and administrative conditions (ACs) (such as use of color cards to support visual color inspection). These relations are reflected in the food quahty relationship model as ... 

All antibodies age and therefore have a specific shelf life. Aging may be different for different antibodies, and real aging may be quite different from the expiry dates printed on containers of antibodies. Mixtures of antibodies as are found in secondary antibody cocktails may show distinct aging differences. In other words, over time, one of the species in a secondary cocktail may age at a more rapid rate than the other(s). This would result in a significant decrease in sensitivity for that particular species of primary antibody. A user performing IHC stain runs with multiple tissues, and using primary antibodies from more than one species, must utilize primary controls for each species of primary antibody to detect a change in one of the components of the secondary antibody cocktail. 

Burger, J., M. Pokras, R. Chafel, and M. Gochfeld. 1994. Heavy metal concentrations in feathers of common loons (Gavia immer) in the northeastern United States and age differences in mercury levels. Environ. Monitor. Assess. 30 1-7. 

This chapter presents an overview of mammalian metabolic fates of pyrethroids, enzymes responsible for biotransformation, human metabolism and species, isomers, and age differences of pyrethroids. 

Rosenblum, L. A. 1972. Sex and age differences in response to infant squirrel monkeys. Brain, Behavior and Evolution 5 30-40. 

Amir D. 1975. Individual and age differences in the spermicidal effect of ethylene dibromide in bulls. 

Borup et al. [254,255,258] have studied the corrosion of DLs. They aged different types of hydrophobic treated DLs for around 1,000 hours in deionized water at 80°C. After these aging tests, the samples were fuel cell tested at different relative humidities. It was observed that the DLs that were aged behaved like hydrophilic DLs they showed the best performance under dry conditions and the worst under high-humidity conditions due to flooding. On the other hand, hydrophobic DL materials that were not aged showed the lowest performance during dry conditions and the best... 

Shram MJ, Li Z, L6 AD (2008) Age differences in the spontaneous acquisition of nicotine selfadministration in male Wistar and Long-Evans rats. Psychopharmacology, 197 45-58 Slade J, Henningfield JE (1998) Tobacco product regulation context and issues. Food Drug Law J 53(suppl) 43-74... 

The geology, textural characteristics of the nodules and bottom sediments, and descriptions of the substratum are summarized on site (Guliy 2004). Samples have been studied for its dimension, and mineralogical and chemical composition in accordance with their space distribution as well as age differences. 

Atmospheric trace gas chemistry is a new rapidly growing field of paleo-atmospheric research, because the radiative properties of CO2, CH4, and N2O make them potential indicators of climate change. A fundamental problem in constructing a record of trace gas concentrations from ice-cores is the fact that the air in bubbles is always younger than the age of the surrounding ice. This is because as snow is buried by later snowfalls and slowly becomes transformed to fim and ice, the air between the snow crystals remains in contact with the atmosphere until the air bubbles become sealed at the fim/ice transition, when density increases to about 0.83gcm. The trapped air is thus younger than the matrix, with the age difference... 

These dosage recommendations are extremely important because blood concentration in all premature and full-term infants younger than 2 weeks of age differs from that of other infants because of variations in the maturity of the metabolic functions of the liver and kidneys. 

Barbara Tuchman (in 1978) wrote in A Distant Mirror the Calamitous 14th Century that Of all the characteristics in which the medieval age differs from the modern, none... 

Lee CK, Kwak YS, Yamamoto J, et al (1990) Psychiatric epidemiology in Korea. Part I Gender and age differences in Seoul. J Nerv Ment Dis 178 242-246 Lewinsohn PM, Zinbarg R, Seeley JR, Lewinsohn M, Sack WH (1997) Lifetime comorbidity among anxiety disorders and between anxiety disorders and other mental disorders in adolescents. J Anxiety Disord 11 377-394... 

This age differs from 4.55 Ga obtained by Patterson (1956) because he... 

Solution Because the Initial Al/ Al ratio in meteorite 1 is greater, meteorite 1 formed earlier. That is, meteorite 1 has an older age. Because the initial ratio in meteorite 2 is half of that in meteorite 1, the age difference is the half-life, which is 0.71 million years. That is, meteorite 1 is older than meteorite 2 by 0.71 Ma. If the age of meteorite 1 is 4562 Ma, then the age of meteorite 2 is 4561.3 Ma. This example shows that using extinct nuclides can distinguish small age differences in the early evolution history of the solar system. 

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