Carl Sagan Day is November 14th 2015. Carl helped instill a love of science and learning in me and gave me my first lesson in scientific skepticism.
Welcome back to your Mutation Station. by Rich Feldenberg Today we will examine the importance of the LP-mutation (Lactase Persistence-mutation),
by Rich Feldenberg Welcome back to your mutation station. Today we’ll look at a harmful effect on your DNA due to ultraviolet light, which leads to dimerization of the nucleotide bases thymine (T). If there are two T bases next to each other in the DNA strand and they absorb UV light they can undergo a photochemical reaction that causes them to link-up. The double bonds in the base break and then form single bonds to their neighbor. This blocks normal base pairing on to the other DNA strand of the double helix, and results in a mutation. Fortunately there are cellular repair mechanisms that can find and fix these errors, but some errors escape detection and cause major harm. Some melanomas are thought to be due to thyimine dimers caused by the effect of UV sunlight. Thymine dimers are actually a more specific form of what is called pyrimidine dimers. The bases thymine and cytosine (T and C)
by Rich Feldenberg Welcome to the long forgotten Ediacaran Period (635-542 Million years ago) in the Precambrian. An assortment of
Why Brontosaurus being back challenges my ability to change my mind. by Rich Feldenberg Ok, here’s the thing. I
Why the Horta would not have looked like a rock monster. By Rich Feldenberg In the original Star