When eight-year-old Hugo Deans discovered a handful of BB-sized objects lying near an ant nest beneath a log in his backyard, he thought they were a type of seed. His father, Andrew Deans, professor of entomology at Penn ...
Plants & Animals
Sep 2, 2022
2
5245
More than 150 years ago, Darwin proposed the theory of universal common ancestry (UCA), linking all forms of life by a shared genetic heritage from single-celled microorganisms to humans. Until now, the theory that makes ...
Evolution
May 12, 2010
150
0
Botanical researchers representing a coalition of more than 10 institutions have discovered an oak tree once thought to be extinct, and now in immediate need of conservation within Big Bend National Park in Texas.
Plants & Animals
Jul 7, 2022
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4456
In the summer of 2002, a week of heavy rains in Central Texas caused Canyon Lake -- the reservoir of the Canyon Dam -- to flood over its spillway and down the Guadalupe River Valley in a planned diversion to save the dam ...
Earth Sciences
Jun 20, 2010
111
1
During the height of the Civil War, the Confederate Surgeon General commissioned a guide to traditional plant remedies of the South, as battlefield physicians faced high rates of infections among the wounded and shortages ...
Cell & Microbiology
May 22, 2019
2
5836
Around mid- to late summer, Adam Downing started receiving about double the number of calls he usually does about oak trees dying.
Environment
Dec 23, 2019
1
59
(AP) -- A utility company preparing to build a new substation in an arid canyon southeast of Los Angeles has stumbled on a trove of animal fossils dating back 1.4 million years that researchers say will fill in blanks in ...
Paleontology & Fossils
Sep 21, 2010
0
0
Renowned for a thriving and intricately studied population of around 900 red deer, the Isle of Rum, part of Scotland's Inner Hebrides, is often considered an outdoor laboratory for scientific research. But the earthworms ...
Ecology
Jun 9, 2024
0
43
In May 2021, the Centers for Disease Control officially recognized that SARS-CoV-2—the virus that causes COVID-19—is airborne, meaning it is highly transmissible through the air.
Biochemistry
Nov 22, 2021
0
78
If you have oak trees in your neighborhood, perhaps you've noticed that some years the ground is carpeted with their acorns, and some years there are hardly any. Biologists call this pattern, in which all the oak trees for ...
Plants & Animals
Nov 15, 2019
1
51
An oak is a tree or shrub in the genus Quercus ( /ˈkwɜrkəs/; Latin "oak tree"), of which about 600 species exist. "Oak" may also appear in the names of species in related genera, notably Lithocarpus. The genus is native to the northern hemisphere, and includes deciduous and evergreen species extending from cold latitudes to tropical Asia and the Americas.
Oaks have spirally arranged leaves, with a lobed margin in many species; some have serrated leaves or entire leaves with a smooth margin. The flowers are catkins, produced in spring. The fruit is a nut called an acorn, borne in a cup-like structure known as a cupule; each acorn contains one seed (rarely two or three) and takes 6–18 months to mature, depending on species. The live oaks are distinguished for being evergreen, but are not actually a distinct group and instead are dispersed across the genus.
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