Principles Underlying Determination of Sex Hormones

Yolk steroid hormones and sex determination in reptiles with TSD.

In reptiles with temperature-dependent sex determination (TSD), the temperature at which the eggs are incubated determines the sex of the offspring. The molecular switch responsible for determining sex in these species has not yet been elucidated. We have examined the dynamics of yolk steroid hormones during embryonic development in the snapping turtle, Chelydra serpentina, and the alligator, A...

Underlying principles of restoration

The term restoration is used in many ways; however, it normally implies return to an original state. In ecological restoration, it should be thought of as applying to whole ecosystems. It must be remembered that options, such as rehabilitation or replacement, exist that may be more practicable than restoration. The components of restoration are the chemical and physical aspects of the habitat a...

Sex Hormones of Females

Basic principles underlying coagulation

This chapter will discuss coagulation in the context of a hemostatic response to a break in the vasculature. Coagulation is the process that leads to fibrin formation; this process involves controlled interactions between protein coagulation factors. Hemostasis is coagulation that occurs in a physiological (as opposed to pathological) setting and results in sealing a break in the vasculature. T...

The Search for Underlying Principles of Health Impact Assessment: Progress and Prospects; Comment on “Investigating Underlying Principles to Guide Health Impact Assessment”

Health Impact Assessment (HIA) is a relatively young field of endeavour, and hence, future progress will depend on the planning, implementation and rigorous evaluation of additional HIAs of projects, programmes and policies the world over. In the June 2014 issue of the International Journal of Health Policy and Management, Fakhri and colleagues investigated underlying principles of HIA through ...