geotaxis

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Related to geotaxis: thermotaxis

ge·o·tax·is

(jē′ō-tăk′sĭs)

Movement of a motile organism using the earth's gravity for orientation.

ge′o·tac′tic (-tĭk) adj.

ge′o·tac′ti·cal·ly adv.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

geotaxis

(ˌdʒiːəʊˈtæksɪs)

(Biology) movement of an organism in response to the stimulus of gravity

ˌgeoˈtactic, ˌgeoˈtactical adj

ˌgeoˈtactically adv

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

ge•o•tax•is

(ˌdʒi oʊˈtæk sɪs)

n.

oriented movement of a motile organism toward or away from a gravitational force.

[1960–65]

ge`o•tac′tic (-tɪk) adj.

ge`o•tac′ti•cal•ly, adv.

geotaxis

the movement of an organism in response to the force of gravity.

See also: Gravity, Motion

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References in periodicals archive ?

Early-stage larvae, however, showed upward orientation in the water column (negative geotaxis), whereas advanced larvae exhibited downward orientation (positive geotaxis).

EARLY LIFE HISTORY OF THE BLUE CRAB CALLINECTES SAPIDUS: A REVIEW

Second, zoospores tend to swim upward in a water column (Erwin and Ribeiro 1996), a phenomenon known as negative geotaxis (movement in the opposite direction of gravity), which helps concentrate zoospores from large volumes of leachate.

Three new Phytophthora detection methods, including training dogs to sniff out the pathogen, prove reliable

Frontinella communis (Hentz, 1850) positive geotaxis

A review of the mechanisms and functional roles of male silk use in spider courtship and mating

In addition, the presence of righting reflex posture; negative geotaxis and adult walking reflex were analyzed.

Damage caused by exposure to propofol during gestation of mice/Danos causados pela exposicao ao propofol durante a gestacao em camundongos

The behavioural basis of larval recruitment in the crab Callinectes sapidus Rathbun: a laboratory investigation of ontogenetic changes in geotaxis and barokinesis.

Infestation of Pseudione tuberculata (Isopoda: Bopyridae) on juveniles of Lithodes santolla (Magellan region, Chile): a spatial mesoscale analysis

Individually daily tests in newborn rats were performed according to WHISHAW & KOLB (2005), and included: righting reflex, from the 2nd to the 5th postnatal day (PND); grip strength, from the 14th to the 17th PND; negative geotaxis, from the 7th to the 10th PND.

Pre- and postnatal evaluation of offspring rats exposed to Origanum vulgare essential oil during mating, gestation and lactation/Avaliacao pre e pos-natal da prole de ratos expostos ao oleo essencial de Origanum vulgare durante acasalamento, gestacao e lactacao

Generally, stink bugs exhibit negative geotaxis, moving upward on objects they encounter, and even if on a flat surface such as the ground, they walk to nearby vertical objects and climb upwards.

Stink bugs (Hemiptera: Pentatomidae) in pheromone-baited traps near crop field edges in Georgia, USA

High risk A hazardous chemical should be chemicals considered as high risk if it is: * a chemical that is carcinogenic * a chemical that is mutagenic, geotaxis or has reproductive hazards * a chemical which affects the central nervous system (which can also affect hearing due to autotoxin effects).

Hazard and risk analysis in spray painting and powder coating of an automobile industries

In our cultures of the oomycete Sommerstorffia spinosa, zoospores often concentrate at the water's surface; they probably swim upwards due to an inherent negative geotaxis that has been postulated for all oomycete zoospores (Carlile 1986).

Phototaxis in Sommerstorffia spinosa (oomycota) zoospores

In Nothomyrmecia (and Myrmecia pyriformis [17]) visual navigation across the ground between nest and host tree in dusk and dawn light is essentially crepuscular, and vision is probably less important than geotaxis for navigation on host trees during full darkness [15].

Evidence for the absence of worker behavioral subcastes in the sociobiologically primitive Australian ant Nothomyrmecia macrops Clark (Hymenoptera: Formicidae: Myrmeciinae)

GEOTAXIS A Organism's response to gravity B Earth pressure C Solid part of the earth who am I?