News tagged with primate
The image of an object, when projected into the eyes, may take on the most diverse shapes depending on the chosen point of view, as this can change its distance, perspective and so on, yet generally we have no difficulty ...
Neuroscience Apr 04, 2013 | 4 / 5 (1) | 0
New findings from nonhuman primates suggest that an overactive core circuit in the brain, and its interaction with other specialized circuits, accounts for the variability in symptoms shown by patients with severe anxiety. ...
Psychology & Psychiatry Mar 25, 2013 | 4.5 / 5 (2) | 0 |
Humans have at least two functional networks in their cerebral cortex not found in rhesus monkeys. This means that new brain networks were likely added in the course of evolution from primate ancestor to human. These findings, ...
Neuroscience Feb 22, 2013 | 1 / 5 (2) | 0
Viruses similar to those that cause AIDS in humans were present in non-human primates in Africa at least 5 million years ago and perhaps up to 12 million years ago, according to study published January 24 in the Open Access ...
HIV & AIDS Jan 24, 2013 | not rated yet | 0 |
Researchers at the National Institutes of Health (NIH) and Oregon Health & Science University (OHSU) have found that an experimental vaccine elicits antibodies that can protect nonhuman primates from Ebola virus infection.
Medical research Jan 14, 2013 | 5 / 5 (2) | 0 |
(Medical Xpress)—Researchers working at the Life Sciences College of Nanjing Agricultural University in China have found that giant pandas naturally produce a peptide that can kill fungi and bacteria. In ...
Medical research Jan 03, 2013 | not rated yet | 0 |
Investigators at Wake Forest Baptist Medical Center have concluded research on a new postmenopausal hormone therapy that shows promise as an effective treatment for menopausal symptoms and the prevention of osteoporosis without ...
Medical research Dec 13, 2012 | not rated yet | 0
Radiation and chemotherapy can pack a powerful punch against all kinds of cancers. Those who survive, however, are often left with bad news: Their treatments have rendered them infertile.
Medical research Dec 10, 2012 | not rated yet | 0
An outbreak of mosquito-borne yellow fever which has killed at least 165 people in Sudan's Darfur region is Africa's worst in decades, the World Health Organisation said on Thursday.
Diseases, Conditions, Syndromes Dec 06, 2012 | not rated yet | 0
Where 'where it's at' is at in the brain: Study in rats identifies region that associates objects and space
Conventional wisdom in brain research says that you just used your hippocampus to answer that question, but that might not be the whole story. The context of place depends on not just how you got there, but ...
Neuroscience Dec 05, 2012 | 5 / 5 (1) | 3 |
German neurophysiologists have developed a new method to study widespread networks of neurons responsible for our memory.
Neuroscience Nov 21, 2012 | 4.5 / 5 (2) | 1 |
(Medical Xpress)—Brazilian researchers Karina Fonseca-Azevedo and Suzana Herculano-Houzel suggest humans evolved bigger brains because they learned to cook their food. In a paper published in the Proceedings of ...
Medical research Oct 23, 2012 | 4.4 / 5 (8) | 4 |
(Medical Xpress)—An international team of researchers has found evidence that suggests that the ABO blood types found in all primates developed in a shared common ancestor. In their paper published in the ...
Medical research Oct 23, 2012 | 4.5 / 5 (4) | 0 |
A new Ebola virus study resulting from a widespread scientific collaboration has shown promising preliminary results, preventing disease in infected nonhuman primates using monoclonal antibodies.
Medical research Oct 15, 2012 | 4.8 / 5 (4) | 1 |
(Medical Xpress)—A mixed background group of US researchers has found in studying chimpanzee brains, that development of myelin, the fatty sheath that covers the connections between nerve cells, occurs ...
Neuroscience Sep 25, 2012 | 5 / 5 (1) | 1 |
A primate (pronounced /ˈprаɪmeɪt/, us dict: prī′·māt) is a member of the biological order Primates (/prаɪˈmeɪtiːz/ prī·mā′·tēz; Latin: "prime, first rank"), the group that contains lemurs, the Aye-aye, lorisids, galagos, tarsiers, monkeys, and apes, with the last category including great apes. With the exception of humans, who inhabit every continent on Earth,[a] most primates live in tropical or subtropical regions of the Americas, Africa and Asia. Primates range in size from the Pygmy Mouse Lemur weighing only 30 grams (1.1 oz) to the Mountain Gorilla weighing 200 kilograms (440 lb). According to fossil evidence, the primitive ancestors of primates may have existed in the late Cretaceous period around 65 million years ago, and the oldest known primate is the Late Paleocene Plesiadapis, c. 55–58 million years ago. Molecular clock studies suggest that the primate branch may be even older, originating in the mid-Cretaceous period around 85 mya.
The Primates order has traditionally been divided into two main groupings: prosimians and simians. Prosimians have characteristics most like those of the earliest primates, and included the lemurs of Madagascar, lorisiforms, Aye-aye and tarsiers. Simians included the monkeys and apes. More recently, taxonomists have created the suborder Strepsirrhini, or "curly-nosed" primates, to include non-tarsier prosimians and the suborder Haplorrhini, or "dry-nosed" primates, to include tarsiers and the simians. Simians are divided into two groups: the platyrrhines ("flat nosed") or New World monkeys of South and Central America and the catarrhine ("narrow nosed") monkeys of Africa and southeastern Asia. The New World monkeys include the capuchin, howler and squirrel monkeys, and the catarrhines include the Old World monkeys (such as baboons and macaques) and the apes. Humans are the only catarrhines that have spread outside of Africa, South Asia, and East Asia, although fossil evidence shows many species once existed in Europe as well.
Considered generalist mammals, primates exhibit a wide range of characteristics. Some primates (including some great apes and baboons) do not live primarily in trees, but all species possess adaptations for climbing trees. Locomotion techniques used include leaping from tree to tree, walking on two or four limbs, knuckle-walking, and swinging between branches of trees (known as brachiation). Primates are characterized by their large brains, relative to other mammals, as well as an increased reliance on stereoscopic vision at the expense of smell, the dominant sensory system in most mammals. These features are most significant in monkeys and apes, and noticeably less so in lorises and lemurs. Three-color vision has developed in some primates. Most also have opposable thumbs and some have prehensile tails. Many species are sexually dimorphic, which means males and females have different physical traits, including body mass, canine tooth size, and coloration. Primates have slower rates of development than other similarly sized mammals, and reach maturity later but have longer lifespans. Some species live in solitude, others live in male–female pairs, and others live in groups of up to hundreds of members.
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