Aging factors affecting

Selunger, O. Z. and Nordrum, L. M. (1969) A regional study of some osmotic, ionic and age factors affecting the stability of cerebral lysosomes. J. Neurochem., 16, 1219-1229. 

Odors are characterized by quaUty and intensity. Descriptive quaUties such as sour, sweet, pungent, fishy, and spicy are commonly used. Intensity is deterrnined by how much the concentration of the odoriferous substance exceeds its detection threshold (the concentration at which most people can detect an odor). Odor intensity is approximately proportional to the logarithm of the concentration. However, several factors affect the abiUty of an individual to detect an odor the sensitivity of a subject s olfactory system, the presence of other masking odors, and olfactory fatigue (ie, reduced olfactory sensitivity during continued exposure to the odorous substance). In addition, the average person s sensitivity to odor decreases with age. 

Both primary factors and lesser secondary factors affect our sense of satisfac tion with the thermal environment. The primaiy factors have significant reproducible effects and directly affect heat transfer and the occupant s thermal state, Secondar factors that may affect one s sense of satisfaction with a space are conditions such as color and ambiance, local climate, age, physical fitness, sound, food, and illness. These secondary factors have smaller to negligible effects on one s thermal state and will not be discussed here, but such information is available. ... 

A considerable area of research has focused on the way in which age can affect performance. This has been prompted by the increasing age of the general workforce. In general, the effects of age on performance will be determined by two factors, namely, characteristics of the particular task and level of experience with it. Literature reviewed by Murrell (1965) has identified four biological changes which take place with age, namely ... 

Various factors affect the activities of the enzymes metabolizing xenobiotics. The activities of these enzymes may differ substantially among species. Thus, for example, the possible toxicity or carcinogenicity of xenobiotics cannot be extrapolated freely from one species to another. There are significant differences in enzyme activities among individuals, many of which appear to be due to genetic factors. The activities of some of these enzymes vary according to age and sex. 

The minimum thickness specification for an FML top liner covered with a layer of soil is 0.75 mm for an FML without a soil cover layer, the specification is 1.14 mm. An FML in a composite bottom liner system must be at least 0.75 mm thick. Even though these FML thicknesses meet U.S. EPA specifications, 0.75mm is not a suitable thickness for all FML materials. In fact, most FML materials installed at landfills are in the range of 1.50-2.50 mm in thickness. Other key factors affecting the selection of FML materials include chemical compatibility with waste leachate, aging and durability characteristics, stress and strain characteristics, ease of installation, and water vapor/ chemical permeation. 

A.J.T. Jull, DJ. Donahue and P.E. Damon, Factors affecting the apparent radiocarbon age of textiles a comment on Effects of fires and biofractionation of carbon isotopes on results of radiocarbon dating of old textiles the Shroud of Turin , by D.A. Kouznetsov et al., J. Archaeol. Sci. 23, 157 160 (1996) D.A. Kouznetsov, A.A. Ivanov and P.R. Veletsky, Effects of fires and biofractionation of carbon isotopes on results of radiocarbon dating of old textiles the Shroud of Turin, J. Archaeol Sci. 23, 109 121 (1996). 

PCDD/PCDFs accumulate in human adipose tissue, and the level reflects the history of intake by the individual. Several factors have been shown to affect adipose tissue concentrations/body burdens, notably age, the number of children and period of breastfeeding, and dietary habits. Breast-milk represents the most useful matrix for evaluating time trends of dioxins and many other POPs. Several factors affect the PCDD/PCDFs content of human breast-milk, most notably the mothers age, the duration of breast-feeding and the fat content of the milk. Studies should therefore ideally... 

The effect of ozone injury on herbaceous plant reproduction has been mentioned earlier in this chapter and in Chapter 11. Seed production by annuals is influenced mainly by the envirorunental conditions of the current year, but perennial woody plants—particularly conifers—are erratic seed-producers. Intrinsic factors affecting cone production include age and vigor seasonal temperature and soil moisture are important environmental factors. ... 

In order to achieve the best quality of a process or a product, the design step of the process or product is a very important one. Most of the quality needed later can be built into the product at the design stage. Here, the best quality is defined as obtaining or approaching as close as possible those characteristics which are desired. Moreover, one wishes to keep close to these properties when variations in process conditions appear, or when a product deteriorates through use or ageing, or when external (environmental or noise) factors affect the product. 

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