CITRIC ACID CYCLE

 Citric Acid Cycle, series of chemical reactions occurring within the cell, responsible for the final breakdown of food molecules to form carbon dioxide, water, and energy.

 This process, which is carried out by seven enzymes (see Enzyme), is also known as the tricarboxylic acid cycle, or the Krebs cycle. The citric acid cycle is active in all animals and higher plants and in most bacteria.

 In organisms that have cells with nuclei, the cycle is contained within a membrane-bound organelle called the mitochondrion, a structure often referred to as the power plant of the cell. Discovery of the citric acid cycle is credited to Sir Hans Adolf Krebs, a British biochemist who outlined its essential steps in 1937.

PARKINSON'S DISEASE

 Parkinson's disease (also known as Parkinson disease or PD) is a degenerative disorder of the central nervous system that often impairs the sufferer's motor skills, speech, and other functions.

 Parkinson's disease belongs to a group of conditions called movement disorders. It is characterized by muscle rigidity, tremor, a slowing of physical movement (bradykinesia) and a loss of physical movement (akinesia) in extreme cases. The primary symptoms are the results of decreased stimulation of the motor cortex by the basal ganglia, normally caused by the insufficient formation and action of dopamine, which is produced in the dopaminergic neurons of the brain. Secondary symptoms may include high level cognitive dysfunction and subtle language problems.

 PD is also called "primary parkinsonism" or "idiopathic PD" (classically meaning having no known cause). The disease is named after English apothecary (pharmacist) James Parkinson, who made a detailed description of the disease in his essay: "An Essay on the Shaking Palsy" (1817).

The lunar maria are large, dark, basaltic plains on Earth's Moon, formed by ancient volcanic eruptions.

Oceanus Procellarum Latin for "Ocean of Storms", is a vast lunar mare on the western edge of the near side of Earth's Moon. Its name derives from the old superstition that its appearance during the second quarter heralded bad weather. Oceanus Procellarum is the largest of the lunar maria, stretching more than 2,500 km (1,600 mi) across its north-south axis and covering roughly 4,000,000 km2 (1,500,000 sq mi) but is, nevertheless, still smaller that the surface area of the Mediterranean Sea on Earth.