Bumblebees of the subgenus Psithyrus (known as 'cuckoo bumblebees', and formerly considered a separate genus) are brood parasites, sometimes called kleptoparasites, in the colonies of other bumblebees, and have lost the ability to collect pollen.ueen and worker bumblebees can sting. Unlike in honeybees, a bumblebee's stinger lacks barbs, so the bee can sting repeatedly without injuring itself; by the same token, the stinger is not left in the wound. Bumblebee species are not normally aggressive, but may sting in defence of their nest, or if harmed.
STEM CELLS SAVE LIVES. For decades, doctors have harnessed the unique ability of stem cells to treat leukemia and genetic blood diseases. But now, researchers are discovering that these cells have the power to heal, to fight disease, and to regenerate damaged or aging tissue throughout the body. To fully understand why they hold the potential to change your childâs medical future, get to know more about stem cells.
Ideally, treatments for spinal cord injuries would limit existing cell death, stimulate growth from existing cells, and replace injured cells. Stem cell treatment is a realistic hope for spinal cord injury patients, said lead author Gregory D. Schroeder, MD, spine research and clinical fellow at the Rothman Institute at Thomas Jefferson University in Philadelphia. There is high-quality basic science research, and clinical trials in humans are underway..