Canadian immunologists have identified a mechanism that promotes the activation of T cell receptors by altering how one of its components interacts with the cell membrane.
(Medical Xpress)—Neuroscience typically proceeds by trimming back previous overly dogmatic statements. Such is the case with new findings that proteins are locally manufactured to order throughout an extended neuronal tree. ...
Diabetes is a condition in which the body produces too little or no insulin. Diabetics thus depend on an external supply of this hormone via injection or pump.
Aug 23, 2023
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Premature rupture of the amniotic sac can have devastating consequences, but scientists in Japan are studying instances when the damaged sac repairs itself—a phenomenon that requires cooperation of the developing fetus.
A team of researchers at Duke University has developed a vaccine against uropathogenic E. coli (UPEC), the type of bacteria that cause urinary tract infections (UTIs) in humans. In their paper published in the journal Science ...
Students of physiology are invariably taught that the primary function of myelin is to insulate nerves. In particular, to make action potentials more efficient by increasing the thickness of the membrane and thereby decreasing ...
For cancer cells to metastasize, they must first break free of a tumor's own defenses. Most tumors are sheathed in a protective "basement" membrane—a thin, pliable film that holds cancer cells in place as they grow and ...
Mar 8, 2021
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The immune system uses its mitochondria to self-stimulate innate and adaptive responses to infection. Reactive oxygen species (ROS), immunogenic mitochondrial DNA (mtDNA), and even whole mitochondria are locally mobilized ...
For many inherited diseases, such as cystic fibrosis or Huntington disease, the disease-causing genetic mutation damages or removes a protein that has an essential role in the body. This protein defect is the root cause of ...
Aug 8, 2013
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The ability to construct complex myelin sheaths around axons is one of the greatest vertebrate inventions since the hinged jaw.
A membrane is a layer of material which serves as a selective barrier between two phases and remains impermeable to specific particles, molecules, or substances when exposed to the action of a driving force. Some components are allowed passage by the membrane into a permeate stream, whereas others are retained by it and accumulate in the retentate stream.
Membranes can be of various thickness, with homogeneous or heterogeneous structure. Membrane can also be classified according to their pore diameter. According to IUPAC, there are three different types of pore size classifications: microporous (dp < 2nm), mesoporous (2nm < dp < 50nm) and macroporous (dp > 50nm). Membranes can be neutral or charged, and particles transport can be active or passive. The latter can be facilitated by pressure, concentration, chemical or electrical gradients of the membrane process. Membranes can be generally classified into three groups: inorganic, polymeric or biological membranes. These three types of membranes differ significantly in their structure and functionality.
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