Category Biology/Biotechnology

A haploid cell with 23 chromosomes (left), and a diploid cell with 46 chromosomes (right). Credit: Columbia University Medical Center/Hebrew University

The stem cell carries a single copy of the human genome, instead of the two copies typically found in normal stem cells. These are the first human cells that are known to be capable of cell division with just 1 copy of the parent cell’s genome. Since the stem cells were a genetic match to the egg cell donor, they could also be used to develop cell-based therapies for diseases such as blindness, diabetes, or other conditions in which genetically identical cells offer a therapeutic advantage. Because their genetic content is equivalent to germ cells, they might also be useful for reproductive purposes.

Previous efforts to generate embryonic s...

Engram cell in AD mouse — This image depicts a single memory engram cell (green) in the hippocampal dentate gyrus (DG) region of a mouse model of early Alzheimer’s disease. To optically manipulate specific connections to these engram cells, a blue light-sensitive protein oChIEF was expressed in an upstream brain region, i.e., medial entorhinal cortical inputs (red) to the DG. The majority of DG granule cells were not active during engram labeling (blue, non-engram cells). Credit: Image courtesy of RIKEN

The rescue of memories, which changed both the structure of neurons as well as the behavior of mice, was achieved using optogenetics, a method for manipulating genetically tagged cells with precise bursts of light...

Adding eggshell nanoparticles to a bioplastic (shown above) increases the strength and flexibility of the material, potentially making it more attractive for use in the packaging industry. Credit: Vijaya Rangari/Tuskegee University

“We’re breaking eggshells down into their most minute components and then infusing them into a special blend of bioplastics that we have developed,” says Vijaya K. Rangari, Ph.D. “These nano-sized eggshell particles add strength to the material and make them far more flexible than other bioplastics on the market. We believe that these traits – along with its biodegradability in the soil – could make this eggshell bioplastic a very attractive alternative packaging material.”

Worldwide, manufacturers produce about 300 million tons of plastic annually...

Quantum dots are fluorescent crystals in which the color of the emitted light is dependent on the size of the crystal. Credit: Richard E. Cruise, University of Leeds

University of Leeds researchers have observed for the first time how HIV and Ebola viruses attach to cells to spread infection. The findings offer a new way of treating such viruses: instead of destroying the pathogens, introduce a block on how they interact with cells. They used ‘quantum dots’ that mimicked the shape of the viruses and acted as technological stand-ins in experiments to reveal how they bind to cells.

Quantum dots are fluorescent crystals in which the colour of the emitted light is dependent on the size of the crystal – one of several properties that has led to them becoming the most desirable component for the...