In these experiments, polypropylene discs were exposed for variable time span and recovered, and the abundance of the present organism was assessed by different techniques.
Polymerase chain reaction parameters were: 95 °C for 5 min; 35 cycles of denaturation at 95 °C for 30 s, annealing for 30 s, extension at 72 °C for variable time spans which depended upon the size of the amplifying fragment (1000 bases min−1); and a final extension at 72 °C for 5 min. Reactions were run on a MaxyGene Gradient thermocycler (Axygen).
The results are displayed for a decrease in cerebral extracellular glucose of ≥ 1 mmol/L over variable time spans within the observation period, and for presence of fever ≥ 38°C.
Once again, the primary sector offers a good example as many biological processes at the bases of food production may require extremely variable time spans.
For instance, tissues have been fixed in formalin for variable times, spanning from few hours in Buell (1982) and Williams (1983), to several years (Glantz and Lewis 2000; Rosoklija et al. 2000) up to 55 (Gorazd et al. 2003).
Soil is a 3-dimensional body with properties that reflect the impact of (1) climate, (2) vegetation, fauna, Man and (3) topography on the soil's (4) parent material over a variable (5) time span.
Under the proposed model, an inventory-taking is conducted at times iT/N(i=1, 2, …, N) for a prespecified time span T and a design variable N. The expected cost per unit time under the periodical inventory-taking strategy is formulated, considering the cost for inventory-taking activities and the investigation cost for the deviation causes.
Formed-unstable: the landslide leads to the formation of dam and a lake basin, which remained for a variable span of time (from hours to centuries) until the general collapse of the dam, often caused by external contributing factors (e.g. earthquakes).
