Dispersed microfossils (spores and phytodebris) provide the earliest evidence for land
plants. They are first reported from the Llanvirn (Mid–Ordovician). More or less identical …

The geochemical carbon cycle is strongly influenced by life on land, principally through the
effects of carbon sequestration and the weathering of calcium and magnesium silicates in …

It is often assumed that life originated and diversified in the oceans prior to colonizing the
land. However, environmental constraints in chemical evolution models point towards critical …

Establishing the timescale of early land plant evolution is essential for testing hypotheses on
the coevolution of land plants and Earth's System. The sparseness of early land plant …

The earliest fossil evidence for land plants comes from microscopic dispersed spores,,.
These microfossils are abundant and widely distributed in sediments, and the earliest …

The evolutionary emergence of land plant body plans transformed the planet. However, our
understanding of this formative episode is mired in the uncertainty associated with the …

Colonization of the land by plants most likely occurred in a stepwise fashion starting in the
Mid-Ordovician. The earliest flora of bryophyte-like plants appears to have been …

Importance Positron emission tomography (PET) may increase the diagnostic accuracy and
confirm the underlying neuropathologic changes of Alzheimer disease (AD). Objective To …

The existence of a terrestrial Precambrian (more than 542 Myr ago) biota has been largely
inferred from indirect chemical and geological evidence associated with palaeosols,, the …

Methylnaltrexone, a peripheral mu-opioid receptor antagonist with restricted ability to cross
the blood-brain barrier, may relieve opioid-induced constipation (OIC) without reversing …