Elsie Nolan, 23 years old
Isotope , one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behaviour but with different atomic masses and physical properties. Every chemical element has one or more isotopes. An atom is first identified and labeled according to the number of protons in its nucleus. This atomic number is ordinarily given the symbol Z. The great importance of the atomic number derives from the observation that all atoms with the same atomic number have nearly, if not precisely, identical chemical properties. A large collection of atoms with the same atomic number constitutes a sample of an element. A bar of pure uranium , for instance, would consist entirely of atoms with atomic number
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The Suess effect is a change in the ratio of the atmospheric concentrations of heavy isotopes of carbon 13 C and 14 C by the admixture of large amounts of fossil-fuel derived CO 2 , which is depleted in 13 CO 2 and contains no 14 CO 2. More recently, the Suess effect has been used in studies of climate change. The term originally referred only to dilution of atmospheric 14 CO 2. The concept was later extended to dilution of 13 CO 2 and to other reservoirs of carbon such as the oceans and soils. Carbon has three naturally occurring isotopes. The 12 C and 13 C isotopes are stable, while 14 C decays radioactively to nitrogen 14 N with a half life of years.
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English Introduction. Collector books. Alphabetic Link Index. Dating Royal Copenhagen - marking system figurines and collectibles. Royal Copenhagen dogs. Dahl Jensen dogs. Paintings, Etchings Bronze, copper, pewter etc Jewelry E-mail.
The doctrine of signatures , dating from the time of Dioscorides and Galen , states that herbs resembling various parts of the body can be used by herbalists to treat ailments of those body parts. A theological justification, as stated by botanists such as William Coles , was that God would have wanted to show men what plants would be useful for. It is today considered to be pseudoscience ,  and has led to many deaths and severe illnesses. For instance birthwort , once used widely for pregnancies, is carcinogenic and very damaging to the kidneys, owing to its aristolochic acid content. Paracelsus — developed the concept, writing that "Nature marks each growth He suggested that God marked objects with a sign, or "signature", for their purpose. The "signature" could sometimes also be identified in the environments or specific sites in which plants grew. The botanist William Coles — supposed that God had made 'Herbes for the use of men, and hath given them particular Signatures, whereby a man may read
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