Nanoparticles act as surgical blades for improved dental surgery
Currently, more than 80 nanotechnologies have been approved for a variety of medical applications, from treating cancer to bioimaging to tissue remodeling.
Currently, more than 80 nanotechnologies have been approved for a variety of medical applications, from treating cancer to bioimaging to tissue remodeling.
A case study led by Southern Illinois University, Illinois, has described the earliest discovery of an ovarian teratoma, a type of tumor that contains well-differentiated tissues developed from three germ cell layers (ectoderm, ...
The story of Ekgmowechashala, the final primate to inhabit North America before Homo sapiens or Clovis people, reads like a spaghetti Western: A grizzled and mysterious loner, against the odds, ekes out an existence on the ...
Evolution
Nov 6, 2023
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University of Otago, New Zealand, researchers have described a new genus and species of dolphin from the late Oligocene. In their paper, "A new dolphin with tusk-like teeth from the late Oligocene of New Zealand indicates ...
Published in the Proceedings of the Royal Society B, a new study details unique findings, analysis and interpretation of saber-toothed cat fossils, offering a glimpse into how the fierce apex predators operated on the high ...
A new study suggests that predatory dinosaurs, such as Tyrannosaurus rex, did not have permanently exposed teeth as depicted in films such as Jurassic Park, but instead had scaly, lizard-like lips covering and sealing their ...
Evolution
Mar 30, 2023
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357
The ancient Egyptians believed that when we died, our spiritual body sought out an afterlife similar to this world. But entry into this afterlife wasn't guaranteed; it first required a perilous journey through the underworld, ...
Archaeology
Jan 24, 2023
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A team of researchers from Seoul National University, the University of Alberta and the Mongolian Academy of Sciences has identified the first known example of a streamlined, non-avian theropod dinosaur to walk on two legs. ...
New Princeton research shows that prehistoric megatooth sharks—the biggest sharks that ever lived—were apex predators at the highest level ever measured.
Plants & Animals
Jun 22, 2022
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Paleontologists have discovered sets of fossils representing three new ichthyosaurs that may have been among the largest animals to have ever lived, reports a new paper in the peer-reviewed Journal of Vertebrate Paleontology.
Plants & Animals
Apr 28, 2022
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Teeth (singular tooth) are small whitish structures found in the jaws (or mouths) of many vertebrates that are used to tear, scrape, and chew food. Some animals, particularly carnivores, also use teeth for hunting or defense. The roots of teeth are covered by gums. Teeth are not made of bone, but rather of tissues of varying density and hardness.
Teeth are among the most distinctive (and long-lasting) features of mammal species. Paleontologists use teeth to identify fossil species and determine their relationships. The shape of the animal's teeth are related to its diet. For example, plant matter is hard to digest, so herbivores have many molars for chewing. Carnivores, on the other hand, need canines to kill prey and to tear meat.
Mammals are diphyodont, meaning that they develop two sets of teeth. In humans, the first set (the "baby," "milk," "primary" or "deciduous" set) normally starts to appear at about six months of age, although some babies are born with one or more visible teeth, known as neonatal teeth. Normal tooth eruption at about six months is known as teething and can be painful.
Some animals develop only one set of teeth (monophyodont) while others develop many sets (polyphyodont). Sharks, for example, grow a new set of teeth every two weeks to replace worn teeth. Rodent incisors grow and wear away continually through gnawing, maintaining relatively constant length. Many rodents such as voles (but not mice) and guinea pigs, as well as rabbits, have continuously growing molars in addition to incisors.
This text uses material from Wikipedia, licensed under CC BY-SA