They lay in a huge sickle-shaped
curve that vanished into mist at last towards the Naze.
Some were thickly set with glittering teeth resembling ivory saws; others were tufted with knots of human hair; and one was sickle-shaped
, with a vast handle sweeping round like the segment made in the new-mown grass by a long-armed mower.
With sickle cell trait, intense exertion can cause sickle-shaped
cells to accumulate and create logjams in the blood vessels.
Sickle cell disease is a genetic disorder that makes the bone marrow produce a defective protein that causes sickle-shaped
blood cells to become hard and sticky.
Now, if you've found a male dobsonfly, which sports a pair of sickle-shaped
mandibles that are over an inch long, you're thinking, "Touch that?
The exhibition features three dinosaurs: Acrocanthosaurus, a carnivore and the official dinosaur of the state of Oklahoma; Tenontosaurus, a long-tailed herbivore; and one of Tenontosaurus' predators, Deinonychus, a carnivore with sickle-shaped
, switchblade-like claws.
It is not clear though which plant species actually have a proven effect on preventing red blood cells becoming sickle-shaped
or in preventing the symptoms of sickle cell disease.
The hereditary condition, in which patients develop sickle-shaped
blood cells, is incurable and can cause severe pain among sufferers when the cells block veins - leading to symptoms known as a crisis.
This produces misshapen red blood cells: Instead of the characteristic disc shape, cells become sickle-shaped
, especially in low-oxygen conditions.
The sharp cutoff is particularly pronounced on the northeast edge of the cloud, where the sickle-shaped
dark nebula B111 lies immediately north of M11, the Wild Duck Cluster.
They are one of the easiest birds to recognise with their sickle-shaped
wings and forked tails, Although they look black against the sky they are dark brown, and they never perch.