News tagged with hormone
Let the sun shine and the plants will follow
Leonardo da Vinci, the Italian Renaissance scientist and artist extraordinaire, in the 15th century was the first to record his observation that some plants appeared to follow the Sun, and he was not the last. ...
May 30, 2012 |
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Is it ripe? Carbon nanotube-based ethylene sensor establishes fruit ripeness
(Phys.org) -- The term ethylene (ethene) generally brings to mind polyethylene plastics, not fruit. However, ethylene is more than just a feedstock for chemical industry, it is also the smallest plant hormone, ...
Chemistry / Analytical Chemistry
May 19, 2012 |
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Supersoldier ants created in the lab by reactivating ancestral genes
(PhysOrg.com) -- There are over 1100 species of Pheidole genus ants, and most individual ants belong to either the worker or soldier caste. In only eight of the Pheidole species, some individuals can belong ...
Jan 06, 2012 |
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Sex-specific behaviors traced to hormone-controlled genes in the brain
Hormones shape our bodies, make us fertile, excite our most basic urges, and as scientists have known for years, they govern the behaviors that separate men from women. But how?
Feb 02, 2012 |
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Researchers induce freezing tolerance in fruit fly
(PhysOrg.com) -- Most of what is known about the ability of some cold blooded animals and several insects to survive having their body temperature fall below freezing has led to the conclusion that those organisms ...
Feb 14, 2012 |
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Early ripening of grapes pinned to warming, soil moisture
Researchers in Australia say they have pinpointed key factors in the early ripening of grapes, providing potential answers for wine growers threatened by global warming.
Feb 26, 2012 |
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Steroids control gas exchange in plants
Plants leaves are sealed with a gas-tight wax layer to prevent water loss. Plants breathe through microscopic pores called stomata (Greek for mouths) on the surfaces of leaves. Over 40% of the carbon dioxide, CO2, in the ...
Feb 05, 2012 |
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A bit touchy: Plants' insect defenses activated by touch
A new study by Rice University scientists reveals that plants can use the sense of touch to fight off fungal infections and insects. The study, which will be published in the April 24 issue of Current Biology, finds ...
Apr 09, 2012 |
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Twenty-year protein mystery solved with surprising results
(PhysOrg.com) -- A new study of the CRYM protein, previously connected with deafness and cancer, has now proven that it has an enzymatic function. This opens up new implications for the treatment of neurological ...
Jan 11, 2012 |
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New tool puts plant hormone under surveillance
(PhysOrg.com) -- Charles Darwin was the first to speculate that plants contain hormones. His pioneering research led to the identification of the very first and key plant growth hormone — auxin — ...
Jan 16, 2012 |
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Songbird brain synapses and glial cells capable of synthesizing estrogen
Colin Saldanha, a biology professor at American University in Washington, D.C., has always been intrigued by the hormone estrogen. Specifically, how the hormone that does so much (for example, it promotes sexual behavior ...
Jan 03, 2012 |
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Research involving thyroid hormone lays foundation for more targeted drug development
Research led by St. Jude Children's Research Hospital scientists advances a strategy for taming the side effects and enhancing the therapeutic benefits of steroids and other medications that work by disrupting the activity ...
Oct 21, 2011 |
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Control gene for developmental timing discovered
University of Alberta researchers have identified a key regulator that controls the speed of development in the fruit fly. When the researchers blocked the function of this regulator, animals sped up their rate of development ...
Sep 28, 2011 |
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Elaborate plumage due to testosterone?
(PhysOrg.com) -- In many bird species males have a more elaborate plumage than females. This elaborate plumage is often used to signal body condition, to intimidate rivals or to attract potential mates. In ...
Oct 21, 2011 |
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Stronger corn? Take it off steroids, make it all female
A Purdue University researcher has taken corn off steroids and found that the results might lead to improvements in that and other crops.
Nov 30, 2011 |
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Hormone
Hormones (from Greek ὁρμή - "impetus") are chemicals released by cells that affect cells in other parts of the body. Only a small amount of hormone is required to alter cell metabolism. It is essentially a chemical messenger that transports a signal from one cell to another. All multicellular organisms produce hormones; plant hormones are also called phytohormones. Hormones in animals are often transported in the blood. Cells respond to a hormone when they express a specific receptor for that hormone. The hormone binds to the receptor protein, resulting in the activation of a signal transduction mechanism that ultimately leads to cell type-specific responses.
Endocrine hormone molecules are secreted (released) directly into the bloodstream, while exocrine hormones (or ectohormones) are secreted directly into a duct, and from the duct they either flow into the bloodstream or they flow from cell to cell by diffusion in a process known as paracrine signalling.
For more information about Hormone, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
