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saccule /SACK-yool/ (1) a small sac; (2) the lesser of two sacs within the vestibule of the inner ear. salpinx (pl salpinges) /SAL-pinks, sal-PIN-jeez/ n. saltation (also saltatory evolution) /sawl-TAY-shən/ n. The production of new types of organisms via rapid, discontinuous processes; used in opposition to the term gradualism. A human spermatozoon is about 0.005 mm (0.002 in) in length. A ring of muscle controlling passage of an orifice. A developmental defect characterized by failure of fusion of vertebral arches, with or without protrusion and dysplasia of the spinal cord or its membranes. Three spirochete genera, Borrelia, Leptospira, and Treponema, contain organisms that are important causative agents of human disease spiroscope /SPIGH-rō-skope/ n. The name is derived from the Latin term lusus naturae, "sport of nature," which expressed the idea that nature was in some way play a game and entertaining itself when it made new organisms in this way. Saliva contains enzymes that begin the digestive process. salt Sodium chloride (Na Cl); more broadly, any chemical compound composed of a positive ion other than hydrogen, and a negative ion, other than the hydroxyl group. A biologist who believes evolution is a saltatory process. Generally, satellite DNA appears as separate bands because each band contains many copies of a specific highly repetitive sequence with a specific density due to its particular GC-to-AT ratio. During spermatogenesis, spermatozoa form in huge quantities within the seminiferous tubules of the testes. It has an oval, flattened head containing a haploid nucleus. MORE INFORMATION | PICTURE sphincter /SFING-ter/ n. In humans, it gives rise to all the nerves of the trunk and limbs. The prominence at the posterior extremity of a vertebra. A genus of helical microorganism belonging to the family Pseudomonadacea (Spirillum minus is the causative agent of rat-bite fever). Any member of Spirochaetes, a phylum of helical bacteria. splicing The process of joining adjacent exons after the removal of an intervening intron. Inflammation of, and resulting damage to, the vertebrae. A supposed process — that has never actually been observed — in which living things arise from nonliving matter. The term is usually applied to plants, but sometimes, especially in older literature, also to animals (for example, Darwin called the Ancon sheep a sport). Ejected saliva mixed with mucous and sometimes pus. The most diverse order of Class Reptilia; includes the lizards, snakes, and worm lizards. (1) (also: squamate) scale-covered, scaly; (2) scale-like (as in the cells of squamous epithelial tissue); (3) (also: squama) the anterior portion of either temporal bones in humans and many other mammals (PICTURE 1 | PICTURE 2). This procedure depends on temporal placement of fragments of wood using carbon-14 (C age and that also extends to a younger age.

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It does not, however, allow one to independently assign an accurate estimation of the age of an object as expressed in years.

RADIOCARBON DATING Discovered by William Libby (1908-1940) in 1950, even though it is not as precise as tree-ring dating, radiocarbon dating is the most widely used dating technique . Of the three groups of carbon isotopes (C-12, C-13, and C-14) C-14 (having 14 electrons) is the rarest, being that only one atom in a trillion is C-14.



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In particular, apart from regular commentaries and essays, the Institute also hosts a monthly column for scholars from across South Asia.… continue reading »


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