In life, however, the growth of body parts is almost always sigmoidal, and few, if any, grow for exactly the same amount of time during ontogeny.
Despite attempts to reduce variation by controlling environmental factors, some of it always remains and is displayed by the fact that absolute chronology is not a reliable measure of time in ontogeny, and neither is the initiation or completion of its different parts (Mabee et al. 2000; Sheil and Greenbaum 2005).
The Hell Creek Project generated eleven years (1999 2009) of collecting and field studies in the Upper Cretaceous Hell Creek Formation, eastern Montana, and resulted in the discovery of a wide variety of new dinosaur specimens, many of which revealed for the first time the ontogeny of well-known dinosaur taxa such as Triceratops.
Their findings suggest that BMI1 does not initiate tumorigenesis on its own, but that its overexpression affects distinct cellular processes and molecular pathways depending on the ontogeny of the cell at the time of overexpression.
The effects of ontogeny (larval size), light and turbulence on the attack rate and swimming activity (proportion of time swimming and duration of swimming bout) of herring larvae (15 28 mm TL) have been investigated.
Previous research on the role of immune-mediated maternal effects in wild passerines has assumed that the ontogeny of immunocompetence in altricial passerines follows the time course described for precocial-developing Gallus species.
This sequence of LD, DD and SK was repeated 5 times to examine the ontogeny of circadian rhythms in mice with and without Naglu.
This is the first study to show the ontogeny of a truncation in the power law distribution of colony sizes throughout time in a wild population.
In the present study, we measured PON1 activity in 458 children at several time points spanning birth through 7 years of age to determine the ontogeny of PON1 phenotypes.
The ontogeny of mirror neurons.
(f k) Ontogeny of pectoral motoneurons.
