Measurements of trace gases in air trapped in polar firn (unconsolidated snow) demonstrate
that natural sources of chlorofluorocarbons, halons, persistent chlorocarbon solvents and …

Methane and ethane are the most abundant hydrocarbons in the atmosphere and they
affect both atmospheric chemistry and climate. Both gases are emitted from fossil fuels and …

A fundamental challenge in plant physiology is independently determining the rates of gross
O 2 production by photosynthesis and O 2 consumption by respiration, photorespiration, …

Amyloid-β (Aβ) pathology is one of the earliest detectable brain changes in Alzheimer’s
disease (AD) pathogenesis. The overall load and spatial distribution of brain Aβ can be …

Air withdrawn from the top 5–15 m of the polar snowpack (firn) shows anomalous enrichment
of heavy gases during summer, including inert gases. Following earlier work, we ascribe …

Gas ratios in air withdrawn from polar firn (snowpack) show systematic enrichments of Ne/N
2 , O 2 /N 2 and Ar/N 2 , in the firn–ice transition region where bubbles are closing off. Air …

Improvements made to an established mass spectrometric method for measuring changes
in atmospheric O 2 /N 2 are described. With the improvements in sample handling and …

Arginine-glycine-aspartate (RGD)-binding α V β 3 -integrin and α V β 5 -integrin play key
roles in tumor angiogenesis. We examined an 18 F-labeled small peptide (fluciclatide [United …

Measurements of atmospheric O 2 /N 2 ratios and CO 2 concentrations can be combined
into a tracer known as atmospheric potential oxygen (APO ≈ O 2 /N 2 + CO 2 ) that is …

Importance Amyloid positron emission tomography (PET) allows the direct assessment of
amyloid deposition, one of the main hallmarks of Alzheimer disease. However, this technique …