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Radioisotopes

WHAT ARE ISOTOPES Elements with same atomic number (SAN) but different atomic weights (DAW). TYPES OF ISOTOPES There are two types of isotopes: Stable Isotopes Naturally occurring Do not emit radiations Identified and quantitated by mass spectrometry or nuclear magnetic resonance. Sometimes used in biochemical investigations.   Unstable or Radioactive Isotopes (IMP SAQ) Nucleus unstable …

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Genetic code

Central Dogma Of Protein Synthesis: (By Crick) DNA ↓ m-RNA ↓ Protein   Genetic Code: Dictionary of nucleotide base combinations which determine sequence of amino acids in proteins.   Codon:              A sequence of 3 nucleotide bases on m-RNA which                            codes for a single amino acid. E.g. AUG codes for                            methionine (Number of Codons= 4 …

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Right Atrium

CONTENTS Position of right atrium External features Internal features POSITION It is the upper right chamber of heart. It forms the right border, upper border, the sternocostal surface & base of heart. EXTERNAL FEATURES The chamber is elongated vertically. Receives superior vena cava at upper end & inferior vena cava at lower end. Upper end …

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Left Coronary artery

ORIGIN Left posterior aortic sinus of ascending aorta. COURSE Posterior aortic sinus Forward                                                                                       Pulmonary trunk       Left       Left auricle   BRANCHES ANTERIOR INTERVENTRICULAR BRANCH ⇒ Septal branches ⇒ Left conus artery forms arterial ring around pulmonary trunk with right conus  artery ⇒ Ant ventricular branches…largest is “left diagonal artery”        2. CIRCUMFLEX BRANCH ⇒ Atrial branches ⇒ Left marginal …

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Arch of Aorta

The ascending aorta extends itself as the arch of aorta at sternal angle and it further extends itself as descending thoracic aorta at sternal angle. So, the beginning and the ending is at the level of sternal angle. It is situated in the superior mediastinum behind the lower half of manubrium sterni. COURSE Begins as …

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