We previously found short periodicities of 4 10 days in the relative growth rates in length and in mass of brook trout Salvelinus fontinalis that persisted under constant lab conditions as well as under different levels of stocking density, food ration and handling.
Even under constant lab conditions, however, a great deal of additive genetic variation is maintained in aggressive traits over many generations [1], [2].
To provide uniformity in comparing data between different lots, constant internal lab standards (purchased from Peprotech, Rocky Hill, NJ, USA, and R and D Systems, Minneapolis, MN USA) were established and used throughout the study.
If the material properties are the same for different particle sizes and the dimensionless groups are kept constant, then lab-scale testing consumes less materials and can be done four times faster using particles with half the particle size.
"There is a constant stream of lab requests, results, notes to the visiting nurses association, and so on," he said.
The animals were maintained in shoebox-type cages in light- (12 hours light to 12 hours darkness) and temperature- (22 ± 2ºC) controlled rooms with constant access to Lab Diet Formula 5001 (23% protein, 4.5% fat, 6% fiber) (Nestlē Purina, St . Louis MO) and tap water.
The animals were maintained in shoebox-type cages in light- (12 h light to 12 h darkness) and temperature- (22 ± 2 °C) controlled rooms with constant access to Lab Diet Formula 5001 (23% protein, 4.5% fat, 6% fiber) (Nestle Purina, St . Louis MO, USA) and tap water.
First, they kept the animals in constant darkness in the lab for more than a month, so that both the swimming and the shell patterns became arrhythmic.
Crickets in this study were exposed to constant densities in the lab (10 15 conspecifics of same sex), but it is possible that G. firmus has evolved agonistic behaviors as result of differences in natural populations.
If you want to reference other students' constant joking around in the lab, say, it would be better to say, "Thanks to Joe and Katherine for their friendship in the lab" than "Thanks to Joe and Katherine for dunking my slides in Jell-O when I was hungover".
The lab was a constant racket of shifting tools, electronics and coffee mugs.
