77 results found

Search Results for: shell

Shell

shell 1. A hard outside covering, as of a fruit or an animal. Specifically: The covering, or outside part, of a nut; as, a... Read More

Definition

Valence electron

What are valence electrons? Why are they significant? Valence electrons definition in chemistry: The electrons in an atom's... Read More

Definition

Top-shell

top-shell (Science: zoology) Any one of numerous species of marine top-shaped shells of the genus Thochus, or family... Read More

Definition

Eggshell

Eggshell 1. The shell or exterior covering of an egg. Also used figuratively for anything resembling an eggshell. 2.... Read More

Definition

Diffusion shell

Diffusion shell a small vessel made of a semipermeable membrane through which peptone, but not serum albumin, can pass; used... Read More

Definition

Nutshell

nutshell 1. The shell or hard external covering in which the kernel of a nut is inclosed. 2. Hence, a thing of little... Read More

Definition

Scallop

scallop 1. (Science: zoology) Any one of numerous species of marine bivalve mollusks of the genus pecten and allied genera... Read More

Article

Actions of Caffeine in the Brain with Special Reference to Factors That Contribute to Its Widespread Use

IV. Actions of Caffeine on Brain Functions and BehaviorHaving discussed the molecular and neuronal actions of caffeine,... Read More

Definition

Test

Definition noun, plural: tests (1) An examination or evaluation. (2) (zoology) The external, protective shell, covering or... Read More

Definition

Incisura

Definition noun, plural: incisurae A notch; an indent; a small hollow Supplement Incisura is a Latin word for incisure... Read More

Definition

Atom

In the enchanting tapestry of life, the smallest of heroes and a celestial protagonist emerges—'the atom'. With grace and... Read More

Definition

Capsid

Capsid Definition A capsid is a three-dimensional proteinaceous capsular shell around a virus that encloses the viral... Read More

Definition

Plankton

Plankton is a diverse group of typically microscopic, aquatic organisms suspended in the water column and rely on water... Read More

Definition

Univalves

univalve (Science: zoology) A shell consisting of one valve only; a mollusk whose shell is composed of a single piece, as... Read More

Definition

Microsphere

A spherical shell that is usually made of a biodegradable or resorbable plastic polymer, that has a very small diameter... Read More

Definition

Kernel

Kernel 1. The essential part of a seed; all that is within the seed walls; the edible substance contained in the shell of a... Read More

Definition

Siphon

siphon 1. A device, consisting of a pipe or tube bent so as to form two branches or legs of unequal length, by which a... Read More

Definition

Oyster

oyster 1. (Science: marine biology, zoology) Any marine bivalve mollusk of the genus ostrea. They are usually found adhering... Read More

Definition

Carboxysome

Carboxysome is a protein-shell micro-compartment inside bacterial cell and is involved chiefly in carbon fixation. It is a... Read More

Definition

Sting

sting 1. (Science: zoology) Any sharp organ of offense and defense, especially when connected with a poison gland, and... Read More

Definition

Protist

Protist Definition What is a protist? All protists are eukaryotes, i.e. organisms with a nucleus. However, they are... Read More

Definition

Mutualism

Mutualism Definition What is mutualism? In biology and ecology, a mutualism is a form of symbiosis that is characterized by... Read More

Definition

Reins

reins 1. The kidneys; also, the region of the kidneys; the loins. 2. The inward impulses; the affections and passions; so... Read More

Tutorial

Arthropods

There are over two million species of arthropods, who initially arrived on Earth in the middle of the Cambrian period.... Read More

Definition

Coccidia

Coccidia (singular: coccidium) are sporozoans that live as parasites of the digestive tracts of certain animals. The... Read More

Definition

Suture

Definition noun, plural: sutures (anatomy) A line of junction or the joint between two articulating bones, especially of the... Read More

Definition

Skull

skull A school, company, or shoal. A knavish skull of boys and girls did pelt at him. These fishes enter in great flotes and... Read More

Article

Sex Reversal – When Males Grew Ovaries Instead of Testes

Summary: Sex reversal is not unusual in some animals, especially in invertebrates. As for the vertebrates, there are... Read More

Definition

Fossil

Definition noun, plural: fossils (1) Any preserved evidence of life from a past geological age, such as the impressions and... Read More

Definition

Organelle

The cell is regarded as the structural, functional, and biological unit of all organisms. It is a membrane-bound structure... Read More

Definition

Egg

Definition noun, plural: eggs (1) An organic vessel where an embryo develops, and one in which the female of an animal... Read More

Definition

Lip

Lip 1. One of the two fleshy folds which surround the orifice of the mouth in man and many other animals. In man the lips... Read More

Definition

Carbon fixation

Carbon Fixation Definition We know that the earth contains many elements. The periodic table shows us just how many... Read More

Definition

Parasitism

Organisms depend on different sources of food to survive. Larger organisms like plants make their own food (autotrophs) and... Read More

Definition

Venus

venus 1. The goddess of beauty and love, that is, beauty or love deified. 2. (Science: anatomy) One of the planets, the... Read More

Definition

Galea

Galea 1. (Science: botany) The upper lip or helmet-shaped part of a labiate flower. 2. (Science: surgery) a kind of bandage... Read More

Definition

Disk

Disk 1. A discus; a quoit. Some whirl the disk, and some the javelin dart. (Pope) 2. A flat, circular plate; as, a disk of... Read More

Definition

Diatom

Diatom Definition A diatom is a unicellular eukaryotic alga characterized by having a siliceous covering and a symmetrical... Read More

Definition

Enterobius vermicularis

Definition noun Human pinworm that inhabits the rectum of its host Supplement Enterobius vermicularis (formerly Oxyurias... Read More

Definition

Glycocalyx

What is the Glycocalyx? The glycocalyx is a polysaccharide-based gel-like, highly hydrous cellular thin layer, covering... Read More