What is the principle behind the MALDI-TOF MS?
The principle of TOF As shown in Figure 2, the basic principle of TOF is that ions of different m/z are dispersed in time during their flight along a field-free drift path of known length.
How does Qtof MS work?
The Q-TOF MS uses a quadrupole (four parallel rods arranged in a square formation), a collision cell, and a time of flight unit to produce spectra. Lighter ions accelerate faster down the flight tube to the detector, thus determining the ions’ mass-to-charge ratios.
What do you mean by M Z?
m/z represents mass divided by charge number and the horizontal axis in a mass spectrum is expressed in units of m/z. Since z is almost always 1 with GCMS, the m/z value is often considered to be the mass.
When does natural selection favor one species over another?
Natural selection can cause evolutionary changes in existing populations and can also favor one species over another if two species are competing for the same space and resources.
How is the optimal foraging theory used in natural selection?
This theory assumes that the most economically advantageous foraging pattern will be selected for in a species through natural selection. When using OFT to model foraging behavior, organisms are said to be maximizing a variable known as the currency, such as the most food per unit time.
Who is the author of the theory of natural selection?
The book is dedicated to Major Leonard Darwin, Fisher’s friend, correspondent and son of Charles Darwin, “In gratitude for the encouragement, given to the author, during the last fifteen years, by discussing many of the problems dealt with in this book.”
How is Fisher’s theorem related to natural selection?
In the first chapter, Fisher considers the nature of inheritance, rejecting blending inheritance, because it would eliminate genetic variance, in favour of particulate inheritance. The second chapter introduces Fisher’s fundamental theorem of natural selection.