Density
1. (Science: radiology) The amount of darkness or light in an area of a scan reflects the compactness and density of tissue. Differences in tissue density are the basis for CT and MR scans.
2. (Science: microscopy) logarithm to the base 10 of the reciprocal of transmittance.
This lesson looks at population attributes, regulation, and growth. It also covers population genetics, particularly genetic variations, natural selection, genetic drift, genetic migration, and speciation...
With regard to the population size of a species and what factors may affect them, two factors have been defined. They are the density-dependent factors and the density-independent factors. Find out the differences between the two in this tutorial. Know how these factors affect populations in an ecosystem...
Regulation of Biological Systems tutorials are focused on the modulation of biological systems from cell to population levels. The course starts with the principles of negative feedback control, and how it regulates blood sugar, water, and temperature in humans. It, then, culminates in the population regulation and ecosystem succession. Learn the various regulatory mechanisms that..
This tutorial looks at the relationship between organisms. It also explores how energy is passed on in the food chain and ecological pyramids...
Plants in lentic habitats have features not found in terrestrial plants. They acquired these features as they adapt to this type of habitat. Read this tutorial to learn more...
The human body is capable of regulating growth and energy balance through various feedback mechanisms. Get to know the events of absorptive and post-absorptive states. This tutorial also describes the endocrine and neural control of compounds such as insulin and glucagon. It also deals with the regulation of growth, heat loss, and heat gain. ..
