منابع مشابه
A Low Temperature Limit for Life on Earth
There is no generally accepted value for the lower temperature limit for life on Earth. We present empirical evidence that free-living microbial cells cooling in the presence of external ice will undergo freeze-induced desiccation and a glass transition (vitrification) at a temperature between -10°C and -26°C. In contrast to intracellular freezing, vitrification does not result in death and cel...
متن کاملEfficiency of Peppermint (Mentha piperita) Powder on Performance, Body Temperature and Carcass Characteristics of Broiler Chickens in Heat Stress Condition
This experiment was carried out to evaluate different levels of peppermint (Mentha piperita) plant powder usage on feed conversion ratio (FCR), body weight (BW), feed intake (FI), body temperature, carcass parts (breast and thigh) and internal organs (liver, heart, gizzard) weights in broiler chicken. A total of 192 broiler chicken were randomly divided into 4 experimental treatments with 4 rep...
متن کاملHistory of life on Earth
“We’re related to the grass”, our biology teacher once proclaimed in his South Tyrolean accent that was at the same time unmistakable and highly liable to impersonation. Our 14-year-old, hormone-clouded minds can perhaps be forgiven for not immediately fathoming the profound scientifi c truth behind this statement, but looking back now, it stuck as poignant way of encapsulating what is perhaps ...
متن کاملUric acid and life on earth
Uric acid is a key product of the metabolism of purines, the backbone of Desoxyribonucleic acid (DNA). Being a fundamental component of every living cell, the total Earth’s DNA base pairs is estimated to weigh 50 billion tons [1],which translates into a huge abundance of uric acid in our planet. It would be naive to think of all these virtual heaps of uric acid as useless, inert waste produces....
متن کاملOzone and life on the Archaean Earth.
The trace gas ozone, produced in the present-day stratosphere, acts as a screen for UV radiation between 195 and approximately 290 nm, depending on its column abundance. On the anoxic Archaean Earth, such an ozone screen would not have existed. Although the presence of other screens, such as an organic haze, might have ameliorated the UV radiation flux, even assuming the worst-case scenario (no...
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ژورنال
عنوان ژورنال: Journal of Mammalogy
سال: 2004
ISSN: 0022-2372,1545-1542
DOI: 10.1644/1545-1542(2004)085<1028:br>2.0.co;2