T-Cell Development

1.Commitment

2.antigen receptor gene rearrangements

3.The selection and expansion of cells (β-selection

TLS Online TPP Program

#Id: 8438

#XL - T Zoology

Where conditions for plant growth are less stressful, plants can evolve life history traits that fall along a continuum from competitors to ruderals.

TLS Online TPP Program

#Id: 8439

#XL - T Zoology

Without the abiotic stressors and without frequent disturbances, plants can grow rapidly for long periods of time, and this creates more competition among plants for soil nutrients and light.

Competitors also tend to grow to larger sizes and exhibit long life spans.

TLS Online TPP Program

#Id: 8440

#XL - T Zoology

Source–sink metapopulation model - A population model that builds on the basic metapopulation model and accounts for the fact that not all patches of suitable habitat are of equal quality.

TLS Online TPP Program

#Id: 8441

#XL - T Zoology

Landscape metapopulation model - A population model that considers both differences in the quality of the suitable patches and the quality of the surrounding matrix.

TLS Online TPP Program

#Id: 8442

#XL - T Zoology

The proportion of occupied patches will stabilize over time to =1− (x/m)

x - Extinction rate 

m - Rate of movement between patches

TLS Online TPP Program

#Id: 4333

#XL - T Zoology

About 75% of the charged residues in proteins are members of ion pairs that are located mostly on the protein surface.

Despite the strong electrostatic attraction interactions contribute little to the stability of a native protein.