Robert Wayne, professor of Ecology and Evolutionary Biology, recently led research that produced the most comprehensive mathematical model ever devised to track the health of populations exposed to environmental change. The team’s groundbreaking integral projection model allows researchers to link many different data sources simultaneously. Scientists can now change just a single variable, like temperature, and see how that affects many factors for a population.

Amander Clark, UCLA assistant professor of Molecular, Cell and Developmental Biology, and colleagues recently found that established human embryonic stem cell lines, including those approved for federal research funding, differ from newly derived human embryonic stem cell lines. This finding highlights the importance of continuing to derive new stem cell lines so that researchers can better understand the ability of these cells to make every cell in the human body.

David Walker, assistant professor of Integrative Biology and Physiology, recently led a study showing that when the expression of a single gene, PGC-1, was boosted within the digestive tracts of fruit flies, the flies lived as much as fifty percent longer. PGC-1 activates the cells’ mitochondria and regulates mitochondrial activity in mammals and flies.

Thomas B. Smith, Professor of Ecology and Evolutionary Biology, and colleagues, recently discovered the first evidence of the H1N1 virus in animals in Africa. In one village in northern Cameroon, a staggering 89 percent of the pigs studied had been exposed to the H1N1 virus, commonly known as the swine flu.

Shelley E. Taylor, distinguished professor in the department of Psychology, is senior author of new research that has identified for the first time, a particular gene’s link to optimism, self-esteem, and “mastery,” the belief that one has control over one’s own life— three critical psychological resources for coping well with stress and depression.