Aging in plants

Nooden LA, Leopold AC (eds.) (1988) Senescing and Aging in Plants. Academic Press, San Diego... 

Raschke K, Zeevaart JAF (1976) Abscisic acid content, transpiration, and stomatal conductance as related to leaf age in plants of Xanthium strumarium L. Plant Physiol 58 169-174... 

Elasticity. Protoplasm is elastic, usually highly so, but occasionally young protoplasm is apparently devoid of elastic qualities at such a time the living substance is plastic. Treitel (95) has called attention to the change from plasticity to elasticity which takes place with age in plant tissues. 

It is recognized that the wastewater volume and characteristics from a specific industrial category will depend on such factors as plant age, size, raw materials used and in-plant processing sequences. 

The NRC response to the TMI-2 accident (NUREG-0737) impacted the four U.S. LWR manufacturers. Consumers Power Company (a midwest utility) estimated that cost of reimniting their Big Rock Point plant to be 125 million hence, not economical, given its age and si/e (240 MWt), nor were the requirements appropriate for unique characteristics of the plant and its siting. The utility initiated a PSA in which their plant personnel fully participated with the PSA contractors to identify and correct some areas of weakness. The NRC accepted the results without the major modifications that would otherwise have been needed. Furthermore, the understanding of the plant and its PSA by plant personnel made this a model for using PSA in plant improvemem. 

Suppose the 14C/12C ratio in plants a thousand years ago was 10% higher than it is today. What effect, if any, would this have on the calculated age of an artifact found by the C-14 method to be a thousand years old ... 

Those authors also demonstrated that neither sexual stage nor age of plant had any effect on the qualitative composition of the lipid fractions. They did comment, however, on the possibility that the secondary chemical output of plants at these different sites might reflect local environmental conditions, especially considering that the distance between the sites at Castelluccio and Brucoli is only a few kilometers. They pointed to the work of Howard et al. (1980), who had demonstrated such effects on the chemical content of two species of Laurencia in California over... 

The aim of the analysis of cannabinoids in plants is to discriminate between the phenotypes (drug-type/fiber-type). Quantification of cannabinoids in plant material is needed if it will be used in medicinal appHcations, e.g., in C. sativa extracts. The ratio between A9-THC and CBN can be used for the determination of the age of stored marijuana samples [84]. 

A. D. Rovira, Root excretions in relation to the rhizosphcre effect IV. Influence of plant species, age of plant, light, temperature and calcium nutrition on exudation. Plant Soil 11 55 (1959). 

Garten and Tucker [49] also studied the soil-to-plant transfer of "Tc. They compared plant uptake of "Tc freshly added to soil with that of "Tc that had aged in the soil for more than a decade. The combination of alkaline soil and freshly added "Tc increased the uptake into radish foliage. The plant/soil concentration ratio was found to be about 40. 

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