(PDF) Oxygen: The molecule that made the world (Oxford Landmark Science) Free

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Description
Oxygen has had extraordinary effects on life.
Three hundred million years ago, in Carboniferous
times, dragonflies grew as big as seagulls, with
wingspans ofnearly a metre. Researchers claim
they could have flown only if the air
had contained more oxygen than today -probably as
much as 35 per cent. Giant spiders, tree-ferns,
marine rock formations and fossil charcoalsall
tell the same story. High oxygen levels may also
explain the global firestorm that contributed to
thedemise of the dinosaurs after the asteroid
impact. The strange and profound effects that
oxygen has had on the evolution of life pose a
riddle, which this booksets out to answer. Oxygen
is a toxic gas. Divers breathing pure oxygen at
depth suffer from convulsionsand lung injury.
Fruit flies raised at twice normal atmospheric
levels of oxygen live half as long as
theirsiblings. Reactive forms of oxygen, known as
free radicals, are thought to cause ageing in
people. Yet ifatmospheric oxygen reached 35 per
cent in the Carboniferous, why did it promote
exuberant growth,instead of rapid ageing and
death? Oxygen takes the reader on an enthralling
journey, as gripping as a thriller, as it
unravels the unexpectedways in which oxygen
spurred the evolution of life and death. The book
explains far more than the size ofancient
insects it shows how oxygen underpins the origin
of biological complexity, the birth
of photosynthesis, the sudden evolution of
animals, the need for two sexes, the accelerated
ageing of cloned animals like Dolly the sheep,
and the surprisingly long lives of bats and
birds. Drawing on this grand evolutionary
canvas, Oxygen offers fresh perspectives on our
own lives and deaths,explaining modern killer
diseases, why we age, and what we can do about
it. Advancing revelatory new ideas,following
chains of evidence, the book ranges through many
disciplines, from environmental sciences
tomolecular medicine. The result is a captivating
vision of contemporary science and a humane
synthesis of ourplace in nature. This remarkable
book might just redefine the way we think about
the world.Oxford Landmark Science books are
'must-read' classics of modern science writing
which have crystallized big ideas, and shaped
the way we think.
3
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Description
Oxygen has had extraordinary effects on life.
Three hundred million years ago, in Carboniferous
times, dragonflies grew as big as seagulls, with
wingspans ofnearly a metre. Researchers claim
they could have flown only if the air had
contained more oxygen than today -probably as
much as 35 per cent. Giant spiders, tree-ferns,
marine rock formations and fossil charcoalsall
tell the same story. High oxygen levels may also
explain the global firestorm that contributed to
thedemise of the dinosaurs after the
asteroid impact. The strange and profound effects
that oxygen has had on the evolution of life pose
a riddle, which this booksets out to answer.
Oxygen is a toxic gas. Divers breathing pure
oxygen at depth suffer from convulsionsand lung
injury. Fruit flies raised at twice normal
atmospheric levels of oxygen live half as long as
theirsiblings. Reactive forms of oxygen, known as
free radicals, are thought to cause ageing
in people. Yet ifatmospheric oxygen reached 35
per cent in the Carboniferous, why did it
promote exuberant growth,instead of rapid ageing
and death? Oxygen takes the reader on an
enthralling journey, as gripping as a thriller,
as it unravels the unexpectedways in which oxygen
spurred the evolution of life and death. The book
explains far more than the size ofancient
insects it shows how oxygen underpins the origin
of biological complexity, the birth of
photosynthesis, the sudden evolution of animals,
the need for two sexes, the accelerated ageing of
cloned animals like Dolly the sheep, and the
surprisingly long lives of bats and birds.
Drawing on this grand evolutionary canvas, Oxygen
offers fresh perspectives on our own lives and
deaths,explaining modern killer diseases, why we
age, and what we can do about it. Advancing
revelatory new ideas,following chains of
evidence, the book ranges through many
disciplines, from environmental sciences
tomolecular medicine. The result is a captivating
vision of contemporary science and a humane
synthesis of ourplace in nature. This remarkable
book might just redefine the way we think about
the world.Oxford Landmark Science books are
'must-read' classics of modern science writing
which have crystallized big ideas, and shaped the
way we think.
6
(PDF) Oxygen The molecule that made the world
(Oxford Landmark Science) Free