Life Sciences Glossary: From Laser Welding to Lingual and Linkage

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Laser Welding

Lasers are widely used now for industrial welding. However, they are now finding increasing application in medicine and one of the common uses abroad is in retina welding.

LED (Light Emitting Diode)

A device that converts electrical energy into light. Used commonly in electronic watches calculators and other digital equipment as a display device.

Lenticular

Having a shape like a double convex lens.

Light Year

A measures of astronomical distance, equal to the distance light travels in the course of a year. It is approximately equal to km.

Lithium

It is the lightest metal.

Lactase

An enzyme that catalysis the hydrolysis of lactose to glucose and galaxies.

Lactation

The process of the synthesis and secretion of milk for nourishment of young.

Lacteal

The intestinal lymph capillary that absorbs digested fat from food.

Lactose

A disaccharide found in the milk of all mammals.

Lagging Strand

The strand of DNA that is synthesized discontinuously during replication.

Lag Phase

A period of time when the population remains small or increases slowly.

Lamarckism

After jean B. P. de Lamarck, the first complete theory of organic evolution, theory of inheritance or heredity of acquired characters.

Lamellae

Concentric rings found in compact bone.

Lamp Brush Chromosome

A chromosome having paired loops extending laterally, occurring in primary oocyte nuclei; they represent sites of active RNA synthesis.

Lamprey

A primitive jawless fishlike vertebrate belonging to the group Agatha.

Langerhans, Islets Of

Clusters of cells that form endocrine portion of the pancreas.

Lanugo

The soft downy hair covering a normal fetus, beginning with the fifth month of life and almost entirely shed in the ninth month.

Larva

An embryonic stage which is free living and self- feeding and unlike the parent.

Larynx

The organ of voice found between pharynx and trachea.

Leading Strand

The strand of DNA that is synthesized continuously during replication.

Lecithin

Phospholipid common in plants and animals essential for the metabolism of fats.

Leprosy

A chronic communicable disease caused by Mycobacterium laree.

Leptons

The first substage of meiotic prophase-I.

Lethal

Capable of causing death.

Lethal Gene

A gene whose phenotypic effect is sufficiently drastic to kill the bearer.

Leucocyte

A white blood cell.

Leukocytosis

An increase in the number of white blood cells.

Leukemia

A cancer-like disease of the blood forming organs characterized by a rapid and abnormal increase in the number of leucocytes and many immature cells.

Leukopenia

A decrease of the number of white blood cells below 5,000 per cubic millimeter.

Leyden Cells

After Franz von Leyden, the cells of interstitial tissue of testis that secrete testosterone.

Libido

The abnormal sexual drive, conscious or unconscious.

Ligament

A sheet of touch elastic, connective tissue fiber, that connects one bone to another.

Ligase

An enzyme that joins the ends of two strands of nucleic acid.

Light Reactions

The reactions of photosynthesis in which solar energy drives the synthesis of ATP and NADH.

Lignin

A polymer of phenolic residue that strengthens secondary cells walls.

Lingual

Pertaining to tongue, as lingual papilla.

Linkage

A relationship among genes in the same chromosome; such genes tend to be inherited together.

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