Light, temperature

There are few investigations into the stability of herbal drugs [5-7] which take into account all the relevant parameters (light, temperature, humidity, degree of comminution,... 

Colorants must provide colorfastness under the required exposure conditions of light, temperature, humidity, chemical exposure, and so on, but without reducing other desirable properties such as flow during... 

The possible effects of increased atmospheric CO2 on photosynthesis are reviewed by Goud-riaan and Ajtay (1979) and Rosenberg (1981). Increasing CO2 in a controlled environment (i.e., greenhouse) increases the assimilation rate of some plants, however, the anthropogenic fertilization of the atmosphere with CO2 is probably unable to induce much of this effect since most plants in natural ecosystems are growth limited by other environmental factors, notably light, temperature, water, and nutrients. 

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). 

C02 is not the only factor involved in photosynthesis, so that for its use, other factors must be at levels that do not limit the process. Light, temperature, amount of available nutrients and the relative humidity are other environmental factors affecting photosynthetic activity. 

Where facilities are exposed to the constant radiation of the sun, sun shades are provided over exterior exposed equipment that may not function properly at elevated temperatures or would deteriorate rapidly if left continual exposed to the direct sunlight. Most electrical or electronic equipment is rated for a maximum operating temperature of 40 °C (104 °F) unless otherwise specified, e.g., hazardous area lighting temperatures are normally specified for 40 °C (104 °F) limit. Of particular concern for fire protection systems are those containing storage for foam concentrates rubber hoses or other rubber components which may dry and crack. 

Because of the long duration and expense of carcinogenicity studies, the care of animals used in these studies is of paramount importance. Various physical and biological factors can affect the outcome of these studies. Some important physical factors include light, temperature, relative humidity, ventilation, atmospheric conditions, noise, diet, housing, and bedding (Rao and Huff, 1990). Biological factors include bacteria and viruses that may cause infections and diseases. 

Flavors can degrade as a result of exposure to light, temperature, headspace oxygen, water, enzymes, contaminants, and other product components so they must be carefully selected and checked for stability. 

Changes in such physical factors as light, temperature (particularly maximums and minimums), relative humidity, and wind speed in forest communities subject to structural alteration by mortality of susceptible species could change the suitability of some sites for growth, reproduction, and re-establishment of survivor species. We can only speculate on some of the possible secondary effects until more data are gathered. ... 

The biological clock may be a feedback system involving ions and ion-transport channels. A model has been proposed341 where membranes introduce configurational changes in response to oscillating ion concentrations whose frequency has been set by a series of environmental parameters such as light, temperature, and tides. 

Because light, temperature, and other in vitro effects on xenobiotic metabolizing enzymes are not different from their effects on other enzymes or enzyme systems,... 

The contribution made by the last two steps can be discovered by applying a field check sample, which is obtained by dividing the problem sample into two and spiking one subsample with a target analyte. Recovery is then determined under different conditions of light, temperature, pH, and so on, in order to select the best sample storage conditions. 

The control of intercurrent infectious diseases or parasites is facilitated if rodents are bred and maintained in conditions free from specific pathogenic organisms. Bedding used in long-term studies should be sterilized. Animals should be housed in quiet, well-ventilated rooms, with controlled lighting, temperature, and humidity. Experiments should not be initiated until animals have been allowed a period of acclimation to the environment. Neither conditions nor animals from outside sources should be placed in tests without an adequate period of quarantine. 

Human can be stressed out by many factors. Some are widely recognized, such as lack of light, temperature, both high and low, type of light (e.g., UV light),... 

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