Received Sep 19; Accepted Feb
There are 24 known isotopes of potassium, three of which occur naturally: Naturally occurring 40 K has a half-life of 1. It decays to stable 40 Ca by beta decay The conventional K-Ar dating method depends on the assumption that the rocks contained no argon at the time of formation and that all the subsequent radiogenic argon 40 Ar was quantitatively retained.
Minerals are dated by measurement of the concentration of potassium and the amount of radiogenic 40 Ar that has accumulated. The minerals best suited for dating include biotitemuscovitemetamorphic hornblendeand volcanic feldspar ; whole rock samples from volcanic flows and shallow instrusives can also be dated if they are unaltered.
In healthy animals and people, 40 K represents the largest source of radioactivity, greater even than 14 C. Potassium is principally created in Type II supernovae via an explosive oxygen-burning process. It makes up about 2. Potash Potash is primarily a mixture of potassium salts because plants have little or no sodium content, and the rest of a plant's major mineral content consists of calcium salts of relatively low solubility in water.
While potash has been used since ancient times, it was not understood for most of its history to be a fundamentally different substance from sodium mineral salts.
Georg Ernst Stahl obtained experimental evidence that led him to suggest the fundamental difference of sodium and potassium salts in and Henri Louis Duhamel du Monceau was able to prove this difference in Potassium was the first metal that was isolated by electrolysis.
It reacts violently with water see section Precautions below  and also reacts with oxygen. Orthoclase potassium feldspar is a common rock-forming mineral.Abstract.
Cardiovascular disease (CVD) is the most common cause of death in the world.
Recent studies have shown an association between adrenal insufficiency (AI) and increased cardiovascular risk (CVR). PET has become an established method for medical research and clinical routine diagnostics.
Development and availability of new radiopharmaceuticals specific for particular diseases is one of the driving forces of the expansion of clinical nuclear medicine providing early .
Introduction The rearing of D.
A sialogram is a test your doctor can use to diagnose a blocked salivary gland or duct in your mouth. The procedure uses X-rays. It’s also called a ptyalogram. 1. Introduction. The detection and identification of body fluids at a crime scene are very important aspects of forensic science. Determining whether or not there is a body fluid present and subsequently identifying it allows the sample to undergo further laboratory testing including DNA analysis which is a very crucial step in a wide range of investigations. Tsai-Jung Wu, Nenad L. Ignjatović, in Nanotechnologies in Preventive and Regenerative Medicine, Radiolabeling with radioisotopes of iodine. Isotopes of iodine have been extensively used in clinical nuclear medicine imaging and radiation therapy. Out of the 37 known isotopes of iodine, 4— I, I, I, and I—are suitable for SPECT or PET imaging.
melanogaster under specific conditions and the experimental extraction of the salivary gland chromosome permits the cytological investigation of the structure, formation and functioning of the polytene (giant) chromosomes and genes during the larval development.
* The first dose of mumps-containing vaccine should be administered on or after the first birthday; the second dose should be administered no earlier than 28 days after the first dose. Fine needle aspiration biopsy (FNAB) has been used in the investigation of salivary gland lesions for many years [1, 2].
The cytological features of the more common salivary neoplasms and inflammatory processes are well recognized, and accurate cytological diagnosis is therefore possible in most cases [ 1, 2 ]. Introduction The rearing of D. melanogaster under specific conditions and the experimental extraction of the salivary gland chromosome permits the cytological investigation of the structure, formation and functioning of the polytene (giant) chromosomes and genes during the larval development.