Obstetrics & gynaecology

Pregnancy disorder subject of new Tulane study

An imaging technique used to detect some forms of cancer can also help detect preeclampsia in pregnancy before it becomes a life-threatening condition, a new Tulane study says.

Psychology & Psychiatry

Menstrual cycle phase influences cocaine craving

Menstrual cycle may influence addiction risk in women, according to a new study in Biological Psychiatry by researchers at the National Institute on Drug Abuse and University of Maryland School of Medicine. In female rats, ...

Psychology & Psychiatry

Psychedelic microdosing in rats shows beneficial effects

The growing popularity of microdosing—taking tiny amounts of psychedelic drugs to boost mood and mental acuity—is based on anecdotal reports of its benefits. Now, a study in rats by researchers at the University of ...

Neuroscience

Smoking and alcohol: Double trouble for the brain?

Along with many other harmful health consequences, smoking tobacco causes chemical changes, oxidative stress and inflammation in the brain. Excessive alcohol use can have similar effects. Surprisingly, however, very few studies ...

Neuroscience

Memories of movement are replayed randomly during sleep

Sleep is far from an inactive time for the brain: while rats (and humans) are asleep, neurons in the hippocampus fire rapidly. After a rat has repeatedly moved from one spot to another, the same neurons that fired while the ...

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Rat

50 species

Stenomys Thomas, 1910

Rats are various medium-sized, long-tailed rodents of the superfamily Muroidea. "True rats" are members of the genus Rattus, the most important of which to humans are the black rat, Rattus rattus, and the brown rat, Rattus norvegicus. Many members of other rodent genera and families are also called rats and share many characteristics with true rats.

Rats are typically distinguished from mice by their size; rats are generally large muroid rodents, while mice are generally small muroid rodents. The muroid family is very large and complex, and the common terms rat and mouse are not taxonomically specific. Generally, when someone discovers a large muroid, its common name includes the term rat, while if it is small, the name includes the term mouse - scientifically, the terms are not confined to members of the Rattus and Mus genera. Compare the taxonomic classification of the Pack rat and Cotton mouse.

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