It is also known as anaphylactic shock. Signs of anaphylaxis include: 1  itchy skin or a raised, red skin rash. 2  swollen eyes, lips, hands and feet. 3  feeling lightheaded or faint. 4  swelling of the mouth, throat or tongue, which can cause breathing and swallowing difficulties.  wheezing.
Shell Helix synthetic technology oils make use of both synthetic and mineral base stocks to achieve higher performance levels than can be formulated from mineral oils alone. Semi synthetic motor oils help protect your engine. Shell Helix semi-synthetic or âsynthetic technologyâ oils make use of both synthetic and mineral base stocks to achieve higher performance levels than can be formulated from mineral oils alone.
Alpha Helices. The alpha helix is a rod-like structure whose inner section is formed by a tightly coiled main chain, with its side chains extending outward in a helical array. The alpha helix structure takes advantage of the hydrogen bond between CO and NH groups of the main chain to stabilize. The CO group of each amino acid forms a hydrogen bond with the NH group of amino acid four residues earlier in the sequence.