nodules of Arantius - définition. Qu'est-ce que nodules of Arantius
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Qu'est-ce (qui) est nodules of Arantius - définition

Arantius' duct; Arantius' ducts; Patent ductus venosus

Ductus venosus         
In the fetus, the ductus venosus (Arantius' duct after Julius Caesar Aranzi) shunts a portion of umbilical vein blood flow directly to the inferior vena cava. Thus, it allows oxygenated blood from the placenta to bypass the liver.
Manganese nodule         
  • Polymetallic nodules
  • Nodules on the seabed
  • Manganese nodules from the South Pacific Ocean
ROCK CONCRETION ON THE SEA BOTTOM MADE OF LAYERS OF IRON/MANGANESE HYDROXIDES
Manganese nodules; Polymetallic nodule; Polymetallic nodules
Polymetallic nodules, also called manganese nodules, are mineral concretions on the sea bottom formed of concentric layers of iron and manganese hydroxides around a core. As nodules can be found in vast quantities, and contain valuable metals, deposits have been identified as a potential economic interest.
root nodule         
  • Nitrogen-fixing nodules on a clover root.
  • Nitrogen is the most commonly limiting nutrient in plants. Legumes use nitrogen fixing bacteria, specifically symbiotic rhizobia bacteria, within their root nodules to counter the limitation. Rhizobia bacteria convert nitrogen gas (N<sub>2</sub>) to [[ammonia]] (NH<sub>3</sub>) in a process called [[nitrogen fixation]]. Ammonia is then assimilated into [[nucleotide]]s, [[amino acid]]s, [[vitamin]]s and [[flavone]]s which are essential to the growth of the plant. The plant root cells convert sugar into organic acids which then supply to the rhizobia in exchange, hence a symbiotic relationship between rhizobia and the legumes.
PLANT PART
Root nodules; Nodulate; Nitrogen-fixing nodules; Root Nodules; Root Nodule; Nodulation; Root hair curling; User:Alyr249/sandbox; Legume Root Hair Curling; Determinate nodule; Indeterminate nodule; Nodule (legume)
¦ noun see nodule (sense 1).

Wikipédia

Ductus venosus

In the fetus, the ductus venosus (Arantius' duct after Julius Caesar Aranzi) shunts a portion of umbilical vein blood flow directly to the inferior vena cava. Thus, it allows oxygenated blood from the placenta to bypass the liver. Compared to the 50% shunting of umbilical blood through the ductus venosus found in animal experiments, the degree of shunting in the human fetus under physiological conditions is considerably less, 30% at 20 weeks, which decreases to 18% at 32 weeks, suggesting a higher priority of the fetal liver than previously realized. In conjunction with the other fetal shunts, the foramen ovale and ductus arteriosus, it plays a critical role in preferentially shunting oxygenated blood to the fetal brain. It is a part of fetal circulation.