Lähetetty: To Syys 13, 2007 7:25 pm
Vielä lisää hiuksista:
"Why a hair may hold the key
— When seen under a microscope the difference between hair from a body and one from a live person — or a hair detached early on from a corpse — is obvious, as seen in the pictures above.
— The “live” hair has a smooth outermost layer, which is known as the cuticle, while the middle layer, known as the cortex, is a light brown colour. In contrast, the “corpse” hair has a ragged cuticle while within the cortex dark bandings can be seen developing. Eventually with “corpse” hair these dark bandings will cover the entire sample.
— According to Dr Michael Baden, chief forensic pathologist for New York State Police and a former chief medical examiner of the city, the timing of the discolouring, or the speed of the development of the bandings, could not be precisely measured: “You can’t tell from looking at it whether it’s 25 days since death or 5 days. It depends on the environment: the hotter the climate, the more rapid the spread of the black bands. There’s not a lot of research been done in this area because it is rare that it does becomes an issue in investigations.”
— While a hair itself contains no DNA, its follicle is rich in cells that give good profiles. A hair follicle is part of the skin that produces strands of hair by packing old cells together. Hair continues to grow for a period after death.
— If DNA found by forensic experts directly matches Madeleine’s, the chances of the profile having originated from someone else is approximately one in a billion. "
"Why a hair may hold the key
— When seen under a microscope the difference between hair from a body and one from a live person — or a hair detached early on from a corpse — is obvious, as seen in the pictures above.
— The “live” hair has a smooth outermost layer, which is known as the cuticle, while the middle layer, known as the cortex, is a light brown colour. In contrast, the “corpse” hair has a ragged cuticle while within the cortex dark bandings can be seen developing. Eventually with “corpse” hair these dark bandings will cover the entire sample.
— According to Dr Michael Baden, chief forensic pathologist for New York State Police and a former chief medical examiner of the city, the timing of the discolouring, or the speed of the development of the bandings, could not be precisely measured: “You can’t tell from looking at it whether it’s 25 days since death or 5 days. It depends on the environment: the hotter the climate, the more rapid the spread of the black bands. There’s not a lot of research been done in this area because it is rare that it does becomes an issue in investigations.”
— While a hair itself contains no DNA, its follicle is rich in cells that give good profiles. A hair follicle is part of the skin that produces strands of hair by packing old cells together. Hair continues to grow for a period after death.
— If DNA found by forensic experts directly matches Madeleine’s, the chances of the profile having originated from someone else is approximately one in a billion. "
