Scientists have shown that honeybees retain a memory of the dominant linear landscape elements in their home area like channels, roads, and boundaries. When transported to an unfamiliar area, they seek out local elements ...
Plants & Animals
Mar 5, 2023
3
1684
Researchers often study the genomes of individual organisms to try to tease out the relationship between genes and behavior. A new study of Africanized honey bees reveals, however, that the genetic inheritance of individual ...
Plants & Animals
Jul 6, 2020
1
362
Scientists placed honey bee hives next to soybean fields in Iowa and tracked how the bees fared over the growing season. To the researchers' surprise, the bees did well for much of the summer. The colonies thrived and gained ...
Ecology
Nov 25, 2019
0
954
(PhysOrg.com) -- For the first time elephants have been found to produce an alarm call associated with the threat of bees, and have been shown to retreat when a recording of the call is played even when there are no bees ...
Plants & Animals
Apr 26, 2010
0
1
The famous work ethic of honey bees might spell disaster for these busy crop pollinators as the climate warms, new research indicates.
Plants & Animals
Mar 25, 2024
3
75
A nutrient-rich product discovered in honeybee hives across Australia could generate a new homegrown health industry.
Biochemistry
Jul 21, 2023
0
111
Widespread pesticide-use and diminished floral diversity in the environment have contributed to the worsening susceptibility of honeybees to infectious disease, threatening their support of adequate pollination of food crops. ...
Ecology
Jun 28, 2023
0
34
A combined team of roboticists and biologists from École Polytechnique Fédérale de Lausanne, in Switzerland and the University of Graz, in Austria, has developed what they describe as a robotic honeycomb to keep honeybees ...
According to a study published by the journal Scientific Reports, when the anthropization of beehives decreases, the relative abundance of their beneficial bacteria increases
Ecology
Mar 13, 2023
1
140
Bees are known to tell time by light and social cues. Now, postdoctoral scholar in biological sciences Manuel Giannoni-Guzmán and researchers from Brandeis University, University of Puerto Rico Rio Piedras, University of ...
Plants & Animals
May 21, 2021
0
148
Urticaria (from the Latin urtica, nettle (whence It. ortica, Sp. ortiga, Pg. urtiga, Fr. ortie) urere, to burn) (or hives) is a kind of skin rash notable for pale red, raised, itchy bumps. Hives is frequently caused by allergic reactions; however, there are many non-allergic causes. Most cases of hives lasting less than six weeks (acute urticaria) are the result of an allergic trigger. Chronic urticaria (hives lasting longer than six weeks) is rarely due to an allergy. The majority of patients with chronic hives have an unknown (idiopathic) cause. Perhaps as many as 30–40% of patients with chronic idiopathic urticaria will, in fact, have an autoimmune cause. Acute viral infection is another common cause of acute urticaria (viral exanthem). Less common causes of hives include friction, pressure, temperature extremes, exercise, and sunlight.
Weals (raised areas surrounded by a red base) from urticaria can appear anywhere on the surface of the skin. Whether the trigger is allergic or non-allergic, there is a complex release of inflammatory mediators, including histamine from cutaneous mast cells, resulting in fluid leakage from superficial blood vessels. Wheals may be pinpoint in size, or several inches in diameter. Angioedema is a related condition (also from allergic and non-allergic causes), though fluid leakage is from much deeper blood vessels. Individual hives that are painful, last more than 24 hours, or leave a bruise as they heal are more likely to be a more serious condition called urticarial vasculitis. Hives caused by stroking the skin (often linear in appearance) are due to a benign condition called dermographism.
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