73 results found

Search Results for: block

Entrance block

Entrance block --> protective block An incompletely understood mechanism whereby a pacemaker is protected from being... Read More

Block

Block An obstruction or... Read More

Freshwater Communities & Lentic Waters

Lentic (still water) communities can vary greatly in appearance, anything from a small temporary puddle to a large lake is... Read More

Nucleotide

Reviewed by: Todd Smith, PhD Nucleotide Definition A nucleotide is regarded as the basic building block of... Read More

Quartering

quartering 1. A station. 2. Assignment of quarters for soldiers; quarters. 3. The division of a shield containing different... Read More

Filtration

Filtration Definition What is filtration? Filtration is separating a solid from a fluid through a porous material that... Read More

Pollution in Freshwater Ecosystems

As with all ecosystems, the existence and operations of human society inevitably have an effect on the way of life in a... Read More

Rack

rack 1. An instrument or frame used for stretching, extending, retaining, or displaying, something. Specifically: An engine... Read More

Anaesthesia

Definition noun An induced reversible loss of perception of pain and other sensations Supplement Anaesthesia is an induced... Read More

Gin

Gin 1. To catch in a trap. 2. To clear of seeds by a machine; as, to gin cotton. Origin: Ginned; Ginning. 1. Contrivance;... Read More

Renegade RNA — Clues to cancer and normal growth

Researchers at Johns Hopkins have discovered that a tiny piece of genetic code apparently goes where no bit of it has gone... Read More

Repressor protein

Definition noun, plural: repressor proteins A protein in which its binding to the operator inhibits the transcription of one... Read More

Fid

Fid 1. A square bar of wood or iron, used to support the topmast, being passed through a hole or mortise at its heel, and... Read More

Sarcolemma

Sarcolemma Definition What is the sarcolemma? It is the thin, transparent, extensible plasma membrane of the muscle cell.... Read More

Vertebra

Definition noun, plural: vertebrae, vertebras Any of the irregular bony structure with some hyaline cartilage that make up... Read More

Antiviral

Antiviral (Science: pharmacology) drugs, including interferon, which stimulate cellular defenses against viruses, reducing... Read More

Adenosine

Definition noun plural: adenosines a·den·o·sine, əˈdɛn əˌsin A purine nucleoside that has adenine bound to a... Read More

Analog

Analog 1. One of two organs or parts in different species of animals or plants which differ in structure or development but... Read More

Myocardium

Myocardium Definition What is the myocardium of the heart?  It is the muscular middle layer of the heart that is... Read More

Fertilization membrane

Definition noun The membrane that forms on the inner surface of the vitelline membrane of the ovum after the entry of a... Read More

Pad

pad 1. A soft, or small, cushion; a mass of anything soft; stuffing. 2. A kind of cushion for writing upon, or for blotting;... Read More

"Mummified" Dinosaur Discovered In Montana

By Hillary Mayell An onsite restoration drawing of how "Leonardo" may... Read More

Gregor Mendel

Definition noun Augustinian monk and botanist who formulated the laws of heredity based on his careful breeding... Read More

Ribonucleotide

Definition noun plural: ribonucleotides ri·bo·nu·cle·o·tide, ˌraɪbəʊˈnjuːklɪəˌtaɪd A form of nucleotide in... Read More

Neural Control Mechanisms

Nerve cells called neurons generate electric signals that pass from one end of the cell to another and release chemical... Read More

CRISPR caused gene damage? Rise and pitfall of the gene-editor

CRISPR as a gene-editing tool made a prodigious leap forward in science. In 2015, it was heralded as Science’s 2015... Read More

Newly Discovered Exploding Ants – Colobopsis explodens

A new ant species, Colobopsis explodens, was recently identified. Similar to other exploding ant species, Colobopsis... Read More

Photosynthesis – Photolysis and Carbon Fixation

Photosynthesis is the means that primary producers (mostly plants) can obtain energy via light energy. The energy gained... Read More

Dominance

Reviewed by: Mary Anne Clark, Ph.D. The previous tutorial investigated Gregor Mendel and how he found trends in... Read More

Inheritance and Probability

Reviewed by: Mary Anne Clark, Ph.D. Gregor Mendel, an Austrian monk, is most famous in this field for his study... Read More

Human Reproduction

Terminology and Concepts Primary reproductive organs are called gonads - testes in the male and ovaries in the female.... Read More

Mononucleotide

Definition noun plural: mononucleotides mon·o·nu·cle·o·tide, ˌmɒnəʊˈnjuːklɪəˌtaɪd A single nucleotide (as... Read More

Polymorphism

Polymorphism Definition The occurrence of two or more different forms or morphs in the population of a species is referred... Read More

Deoxyribonucleotide

Definition noun plural: deoxyribonucleotides de·ox·y·ri·bo·nu·cle·o·tide, diˌɒk... Read More

Adenine nucleotide

Definition noun plural: adenine nucleotides A nucleotide wherein the nucleobase is adenine Details Overview A nucleotide... Read More

Sclerotome

Definition noun, plural: sclerotomes (embryology) The somite that gives rise to the development of vertebrae and... Read More

Polynucleotide

Definition noun plural: polynucleotides pol·y·nu·cle·o·tide, ˌpɒlɪˈno͞o′klē-ə-tīd A biopolymer comprised of... Read More

Laminarin

Definition noun, plural: laminarins A storage polysaccharide that is found in brown algae which is purely made up of... Read More

Oligonucleotide

Definition noun plural: mononucleotides ol·i·go·nu·cle·o·tide, ŏl′ĭ-gō-no͞o′klē-ə-tīd A short polymer... Read More

Dinucleotide

Definition noun plural: dinucleotides di·nu·cle·o·tide, daɪ njuːklɪəˌtaɪd An organic compound comprised of two... Read More