Tag: "leaves" at biology news
How roots control plant shoots
...red a gene that allows a plant's roots to tell the leaves
to stop growing, presumably when water is scarce, ... send chemical signals that control whether or not leaves
grow. How leaves
grow is a crucial matter given that leafy plants supply food for humans and other c...
Environmental exposures before and after birth can harm children's lungs
... the child's developmental programming, which then leaves
the child's airways at risk for future harm." People living in high-traffic areas and poor housing are at especially high risk for PAH and ETS exposure. PAHs can come from motor vehicle emissions, residential heating, power generation, tob...
How to use math and a CT scanner to see how trees intercept light
...rts the CT scan data into a digital 3-D model. As leaves
and branches yield different CT scan data, the leaves
can be removed from the digital model. The resulting skeletal images give more detailed and accurate...
UCSD medical researchers use brain cell transplants to correct muscle spasms after aneurysm surgery
...c-like widening of the aorta, the main artery that leaves
the heart. A subpopulation of patients with ischemic spinal cord injury develop a prominent muscle spasticity, or jerkiness of the legs and lower body, due to the irreversible loss of specialized spinal cord cells that control local motor function. ...
Conversion of flower organs into leaves
...hat these genes are critical for the conversion of leaves
into flower organs. Although people have wondered about the mysteries of flower formation for ages, scientists have carried out molecular studies on flowering only during the last two decades. Numerous genes controlling flower development have...
Asymmetric organs and microRNA-directed DNA modification
...ired for DNA modification at the target gene. The leaves
of the plant Arabidopsis have top and bottom halves with different cellular morphologies and different physiological roles. Specific mutations in the Arabidopsis genes PHABULOSA (PHB) and PHAVOLUTA (PHV) interfere with normal leaf patterning. The m...
JCI table of contents, November 15 2004
...a, characterized by severe anemia, loss of beta-Hb leaves
alpha-Hb subunits unpaired and alpha-Hb production of toxic oxygen molecules reduces the lifespan of circulating red blood cells. In the November 15 issue of the Journal of Clinical Investigation, Mitchell Weiss and colleagues investig...
No getting around RET
...l physiological role for RET-independent GFR1, but leaves
the question of why GFR1 would be more widely expressed if it indeed plays no role without RET. It may be the case that GFR receptors associate with other partners that have yet to be identified. Whatever the answer, by laying to rest a theory that h...
Researchers discover new way to boost grain crops' drought tolerance
...singly, by reducing the level of ethylene, all the leaves
of the altered plants contained higher levels of chlorophyll and leaf protein, and functioned better than control leaves. "Thus, they are better able to survive conditions of drought and remain productive," said Professor Gallie, who led a research ...
Plant pathologists offer soybean rust identification and management tips
... in the U.S. Soybean rust primarily affects plant leaves
and creates two types of lesions--tan and red lesi...t severe. The appearance of brown spots on soybean leaves
is the first sign of infection. When the leaf is turned over, a plant infected with soybean rust wil...
Studies in Royal Society journals include stress in birds and depletion of medieval fish stocks
... cotton plants bear extrafloral nectaries on their leaves
that provide a nutritional resource for ants. In some populations of wild cotton, this army of ant visitors protects the plants against insect herbivores. In other populations, however, ants are less abundant and confer no benefits. Little is know...
Scientists name world's whiffiest cheese
...nce region, aged 1-2 weeks and wrapped in chestnut leaves
Epoisses de Bourgogne AOC - Cow's milk cheese from Burgundy, aged 4-6 weeks, rind is washed with brandy (Marc de Bourgogne) Parmesan - Cow's milk cheese from Italy, aged 2 years Raclette - Cow's milk cheese from Frenc...
New method to measure ancient land elevation developed by Field Museum scientist
...of paleoelevation involves counting the stomata on leaves
of plants going back as far as 65 million years ago. Stomata are minute openings on the surface of leaves
through which plants absorb gases, including carbon dioxide, which plants need for photosynthesis.An...
Save up your energy reserves for a longer life!
...e controlled and extended therapeutically. Apfeld leaves
us with some food for thought "In humans, AMP-1 is activated in muscle in response to exercise. It is tempting to speculate that perhaps some of the beneficial effects of exercise in human health are the result of the effect of AMP-1 activation on th...
Less fat makes better process for designing new drugs
... are the gatekeepers that regulate what enters and leaves
a cell, explained Martin Caffrey, professor of chemistry at Ohio State. To design a drug that will target a particular protein, scientists need to view the protein's structure in detail, and that involves removing the protein from the cell membrane a...
Carbon sink or carbon source? Aerosols play role in shifts
... to the amount of shade provided by tree and plant leaves
in forests and croplands. The lack of shading in grasslands changes the ground surface temperature, which alters the rate of photosynthesis in plants and the CO2 emissions by soil. Since plants want to take in CO2 but also preserve water at the same ...
Researchers compare chicken, human genomes
...ercent of the chicken genome, researchers say that leaves
them with no explanation for the function of more than 85 percent of the chicken genome. They hypothesize this genetic "dark matter" may contain previously unrecognized regulatory elements, but also may include ancient DNA repetitive elements that ha...
Canola study solves seed oil mystery
...pounds such as sugars, oils and proteins in stems, leaves
and flowers. To harvest carbon from the air, plants go to lots of trouble to convert carbon dioxide into simple sugars. When canola subsequently transformed these sugars into oils, the plants appeared to cough up lots of the carbon dioxide bac...
Baby songbirds and human infants learn sounds in similar ways
...her emerges as an exercise in problem solving that leaves
much room for external influences and individual learning styles," Nottebohm says. "We're not teaching our zebra finches how to learn their song -- how to get there is totally up to the birds."...
Vitamin E in plant seeds could halt prostate, lung cancer, says Purdue scientist
...s of cell membranes. However, the gamma-tocopherol leaves
healthy human prostate cells unaffected, which could give it value as an anticancer agent. "This is the first time gamma-tocopherol has been shown to induce death in lab-grown human cancer cells while leaving healthy cells alone," said Jiang, who ...
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