Definitions beginning with M

Micron - permalink - collapse

All > Science > Water

A unit of length equal to one millionth of a meter, and one thousandth of a millimeter. One inch equals 25,400 microns.

Bureau of Reclamation - Cite This Source - This Definition
Browse Related Terms: Contraction joint, Control joint, Foot-Pound, Gallon, MIL, Pounds per square inch (psi or lb/in2)

All > Science > Weather

Unit of length equal to one thousandth (1/1000) of a millimeter; one millionth (1/1000000) of a meter (1x10^-6 m).
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: angstrom (Å), H5, H7, H8, Hectopascal, HPA, MB, Millibar

Micronuclei - permalink - collapse

All > Science > Biotechnology and Genetics > Human Genome

Chromosome fragments that are not incorporated into the nucleus at cell division.
Human Genome Project - Cite This Source - This Definition
Browse Related Terms: Autosome, Chromosome, Genome, human artificial chromosome (HAC), Nucleus, sex chromosome, sex-linked, Y-chromosome

micronucleus - permalink - collapse

All > Science > Biotechnology and Genetics > Food Biotechnology

A nucleus, distinct from and smaller than the main nucleus, but lying within the same cell. They usually arise following abnormal meiotic or mitotic telophases, where individual chromosome s or chromosome fragments do not reach the pole.
UN Food and Agriculture Organization - Cite This Source - This Definition
Browse Related Terms: anaphase, B chromosome, cell cycle, fission, interphase, Karyotype, Mitosis, telophase

micronutrient - permalink - collapse

All > Medicine > Cancer

(MY-kroh-NOO-tree-ent) A substance the body needs in tiny amounts to grow and stay healthy. Examples are vitamins and minerals.
National Cancer Institute - Cite This Source - This Definition
Browse Related Terms: cobalamin, cyanocobalamin, nutrient, retinoid, vitamin A, vitamin B12, vitamin D, vitamin K

All > Science > Biotechnology and Genetics > Food Biotechnology

An essential element normally required in cell culture at concentrations under 0.5 millimole/litre.
UN Food and Agriculture Organization - Cite This Source - This Definition
Browse Related Terms: anther culture, artificial medium, callus culture, cell number, cell suspension, culture alteration, culture room, embryo culture, gel, hairy root culture, initiation, Media, meristem culture, microalgal culture, nodal culture, organ culture, organoid, panicle culture, single node culture, stages of culture (I-IV), stationary culture, suspension culture, synchronous culture

microorganism - permalink - collapse

All > Medicine > Cancer

An organism that can be seen only through a microscope. Microorganisms include bacteria, protozoa, algae, and fungi. Although viruses are not considered living organisms, they are sometimes classified as microorganisms.
National Cancer Institute - Cite This Source - This Definition
Browse Related Terms: dark-field microscope, microscopic, protozoal

A sequence of microinstructions that are in special storage where they can be dynamically accessed to perform various functions.
ATIS - Cite This Source - This Definition
Browse Related Terms: absolute address, direct access, direct address, search time, seek, serial access, storage

microprojectile bombardment - permalink - collapse

All > Science > Biotechnology and Genetics > Food Biotechnology

See: biolistics.
UN Food and Agriculture Organization - Cite This Source - This Definition
Browse Related Terms: binary vector system, biolistics, Competency, competent, Electroporation, explosion method, Ti (tumor-inducing) plasmid

micropropagation - permalink - collapse

All > Science > Biotechnology and Genetics > Food Biotechnology

Miniaturized in vitro multiplication and/or regeneration of plant material under aseptic and controlled environmental conditions.
UN Food and Agriculture Organization - Cite This Source - This Definition
Browse Related Terms: cutting, embryo rescue, gametoclone, microtuber, minituber, organogenesis, plantlet, protocorm, regeneration, totipotency

micropyle - permalink - collapse

All > Science > Biotechnology and Genetics > Food Biotechnology

1. A small opening in the surface of a plant ovule through which the pollen tube passes prior to fertilization. 2. A small pore in some animal cells or tissues.
UN Food and Agriculture Organization - Cite This Source - This Definition
Browse Related Terms: anther, anthesis, double fertilization, microgametophyte, pollination, self-incompatibility, Self-pollination, stigma, style, xenia

microsatellite - permalink - collapse

All > Medicine > Cancer

A short sequence of DNA, usually 1 to 4 basepairs (a unit of DNA), that is repeated together in a row along the DNA molecule. There is variation from person to person in the number of repeats. There are hundreds of places in human DNA that contain microsatellites.
National Cancer Institute - Cite This Source - This Definition
Browse Related Terms: copolymer, microsatellite instability, MSI, Polymer

All > Science > Biotechnology and Genetics > Food Biotechnology

A segment of DNA characterized by a variable number of copies(typically 5-50) of a sequence of around 5 or fewer bases (called a repeat unit ). At any one locus (genomic site), there are usually several different " alleles " in a population, each allele identifiable according to the number of repeat units. This existence of multiple alleles (high level of polymorphism ) has enabled microsatellites to be developed as powerful markers in many different species. They are detected by the polymerase chain reaction ..
UN Food and Agriculture Organization - Cite This Source - This Definition
Browse Related Terms: allele frequency, allelic exclusion, allelomorph, cline, gene conversion, Gene frequency, homoallele, isoallele, lethal allele, lethal gene, Mendelian segregation, multiple alleles, null allele, trinucleotide repeat

All > Science > Biotechnology and Genetics > Human Genome

Repetitive stretches of short sequences of DNA used as genetic markers to track inheritance in families. See also inherited, nucleotide, chromosome, polymorphism
National Human Genome Research Institute - Cite This Source - This Definition
Browse Related Terms: Directed sequencing, Expressed sequence tag (EST), GC-rich area, Gene prediction, homeobox, repetitive DNA, scaffold, Sequence-tagged site (STS), Tandem repeat sequences, Transposable element

microsatellite instability - permalink - collapse

All > Medicine > Cancer

(MY-kroh-SA-teh-lite in-stuh-BIH-lih-tee) A change that occurs in the DNA of certain cells (such as tumor cells) in which the number of repeats of microsatellites (short, repeated sequences of DNA) is different than the number of repeats that was in the DNA when it was inherited. The cause of microsatellite instability may be a defect in the ability to repair mistakes made when DNA is copied in the cell. Also called MSI.
National Cancer Institute - Cite This Source - This Definition
Browse Related Terms: copolymer, microsatellite, MSI, Polymer

Microscale - permalink - collapse

All > Science > Weather

Pertaining to meteorological phenomena, such as wind circulations or cloud patterns, that are less than 2 km in horizontal extent.
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: CALM, Easterlies, FLW, Gradient High Winds, Katabatic wind, LLWS, Mixing Depth, Predominant Wind, Profiler, Straight-Line Hodograph, Straight-line Winds, Transport Wind, Turbulence, UWNDS, Wind Field, WND

microscopic - permalink - collapse

All > Medicine > Cancer

Too small to be seen without a microscope.
National Cancer Institute - Cite This Source - This Definition
Browse Related Terms: dark-field microscope, microorganism, protozoal

Microsoft - permalink - collapse

All > Technology > Search > SEO / Search Marketing

Maker of the popular Windows operating system and Internet Explorer browser.

SEO Book - Cite This Source - This Definition
Browse Related Terms: Browser, Firefox, Google Toolbar for Internet Explorer, Google Toolbar for Mozilla Firefox, Internet Explorer, Mozilla Firefox, Opera, Safari, Toolbar, Web browser

Microsoft Data Engine (MSDE) - permalink - collapse

All > Technology > Collaboration > SharePoint

A data store based on Microsoft SQL Server technology, but designed and optimized for use on smaller computer systems, such as a single user computer or a small workgroup server. Also known as Microsoft SQL Server Desktop Engine.
SharePoint Forum - Cite This Source - This Definition
Browse Related Terms: configuration database, Configuration database (_Config_DB), content database, Server Farm, SQL Server computer, Web farm

Microsoft Digest - permalink - collapse

All > Technology > Operating System > Microsoft Windows > Microsoft Windows Server > Microsoft Active Directory

A security support provider (SSP) that implements the Digest Access protocol. Microsoft Digest provides a simple challenge-response mechanism for authenticating clients, and it is intended for use by client/server applications that use communications that are based on Hypertext Transfer Protocol (HTTP) or Simple Authentication and Security Layer (SASL).
GuardianEdge Technologies - Cite This Source - This Definition
Browse Related Terms: Digest Access Protocol (DAP), SASL, Simple Authentication and Security Layer (SASL), SSL

Microsoft Exchange Hosted Services - permalink - collapse

All > Technology > E-mail > Microsoft Email > Microsoft Exchange > Microsoft Exchange 2007

A set of four distinct hosted services: Hosted Filtering, which helps organizations protect themselves from e-mail-borne malware; Hosted Archive, which helps them satisfy retention requirements for compliance; Hosted Encryption, which helps them encrypt data to preserve confidentiality; and Hosted Continuity, which helps them preserve access to e-mail during and after emergency situations. These services integrate with any on-premise Exchange servers that are managed in-house or Hosted Exchange e-mail services that are offered through service providers. [Exchange 2007]
Microsoft - Cite This Source - This Definition
Browse Related Terms: Active Directory, Active Directory Domain Services (AD DS), Active Directory Lightweight Directory Services, Active Directory Service Interfaces, ADAM (Active Directory Application Mode), ADSI (Active Directory Service Interfaces), Lightweight Directory Services, MAPI (Messaging Application Programming Interface)

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Micron - permalink - collapse

Micronuclei - permalink - collapse

micronucleus - permalink - collapse

micronutrient - permalink - collapse

microorganism - permalink - collapse

micro-organism - permalink - collapse

microplast - permalink - collapse

Microprocessor - permalink - collapse

microprogram - permalink - collapse

microprojectile bombardment - permalink - collapse

micropropagation - permalink - collapse

micropyle - permalink - collapse

microsatellite - permalink - collapse

microsatellite instability - permalink - collapse

Microscale - permalink - collapse

microscopic - permalink - collapse

Microsoft - permalink - collapse

Microsoft Data Engine (MSDE) - permalink - collapse

Microsoft Digest - permalink - collapse

Microsoft Exchange Hosted Services - permalink - collapse