Using a type of human stem cell, researchers say they have created a three-dimensional complement of human retinal tissue in the laboratory, which notably includes functioning photoreceptor cells capable of responding to light, the first step in the process of converting it into visual images.
Scientists believe they have an explanation for the axiom that stress, emotional shock, or overexertion may trigger heart attacks in vulnerable people. Hormones released during these events appear to cause bacterial biofilms on arterial walls to disperse, allowing plaque deposits to rupture into the bloodstream.
A key molecule developed at Hybrid Plastics now forms a main component in an effort to develop synthetic human organs for medical treatment. Such organs include tear ducts, blood vessels and windpipes.
When stem cells are used to regenerate bone tissue, many wind up migrating away from the repair site, which disrupts the healing process. But a research team makes use of hydrogel polymers in keeping the stem cells in place, resulting in faster and better tissue regeneration.
Strong cell-to-cell bonds are important to heart health and fighting cancer. The bonds connecting heart cells have to withstand constant forces caused by continuous pumping. And, in some cancers, bonds no longer resist forces, allowing cancer cells to detach and spread.
A team of researchers studying a flowering plant has zeroed in on the way cells manage external signals about prevailing conditions, a capability that is essential for cells to survive in a fluctuating environment.
In laboratory tests, researchers have used electrical stimulation of retinal cells to produce the same patterns of activity that occur when the retina sees a moving object. Although more work remains, this is a step toward restoring natural, high-fidelity vision to blind people.