Crystallisation is a separation technique that is used to separate a solid that has dissolved in a liquid and made a solution. solution that has as much solid dissolved in it as it can possibly contain is called a saturated solution. As the saturated solution is allowed to cool, the solid will come out of the solution and crystals will start to grow.
Unsourced material may be challenged and removed. (September 2007). Methemoglobinemia (or methaemoglobinaemia) is a disorder characterized by the presence of a higher than normal level of methemoglobin (metHb, i.e., ferric [Fe 3+ ] rather than ferrous [Fe 2+ ] haemoglobin) in the blood.igns and symptoms of methemoglobinemia (methemoglobin level above 1%) include shortness of breath, cyanosis, mental status changes (~50%), headache, fatigue, exercise intolerance, dizziness and loss of consciousness.
Acquired methemoglobinemia results from exposure to noxious substances that cause the rate of methemoglobin formation to exceed its rate of reduction. This cause is particularly relevant when clinicians are treating pediatric and elderly patients. 5 In clinical practice, the most common medications associated with methemoglobinemia are linked to an alanine ring that is found in many over-the-counter medications and in all anesthetics . 6