Ethylene is an essential plant hormone at low concentrations. Concentrations in the field rarely exceed 5 nmol⋅mol−1 (0.005 ppm), but it can accumulate as a gas in closed, indoor environments. These elevated levels can ...
Biotechnology
Sep 25, 2023
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1
In many animals, including ants, the blood-brain barrier (BBB) ensures normal brain function by controlling the movement of various substances in and out of the brain. Researchers reporting in the journal Cell on September ...
Plants & Animals
Sep 7, 2023
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13
Across the U.S., legislators are debating how and when sex and gender should be discussed in the classroom and beyond. Specifically, these bills are considering whether anything beyond male or female can be included in library ...
Education
Aug 31, 2023
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6
The Y chromosome is a never-ending source of fascination (particularly to men) because it bears genes that determine maleness and make sperm. It's also small and seriously weird; it carries few genes and is full of junk DNA ...
Evolution
Aug 24, 2023
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12
During the rainy breeding season, the underwater "conversation" among electric fish changes. Fish revved up to make a match broadcast slightly different signals to advertise their presence and identify compatible mates.
Plants & Animals
Aug 10, 2023
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57
A team of biologists and aquatic researchers from Suffolk University, Arctic Aquatic Research Division, Fisheries and Oceans Canada, and the Greenland Institute of Natural Resources has found evidence suggesting that female ...
New research has found tiger snakes in Perth's urban wetlands are accumulating high levels of chemical substances from ingesting PFAS (per- and polyfluoroalkyl substances), impacting the venomous reptiles' overall health.
Plants & Animals
Jul 17, 2023
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2
Marine fish larvae can be compared to athletes who must perform if they want to survive. The success of their journey, and transformation from larvae to adults, a process known as metamorphosis, is crucial for the sustainability ...
Plants & Animals
Jul 10, 2023
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91
In a study published in Plant Communications, Chu Jinfang's team from the Institute of Genetics and Developmental Biology of the Chinese Academy of Sciences (CAS) has proposed a new method for high-accuracy measurement of ...
Molecular & Computational biology
Jun 30, 2023
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1
An obscure aquatic plant has helped to explain how plants avoid cracking up under the stresses and strains of growth.
Plants & Animals
Jun 22, 2023
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640
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.
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