Polarography: an oxygen survey correlating oxygen transmissibility to "EOP" values.

Critical oxygen levels to avoid corneal edema for daily and extended wear contact lenses.

The relationship between corneal edema and hydrogel lens oxygen transmissibility was examined for both daily and extended contact lens wear by measuring the corneal swelling response induced by a variety of contact lenses over a 36-hr wearing period. The relationships derived enable average edema levels that occur with daily and extended wear in a population of normal young adults to be predict...

Oxygen Polarography in the Awake Macaque: Bridging BOLD fMRI and Electrophysiology

Direct noninvasive measurement of tear oxygen tension beneath gas-permeable contact lenses in rabbits.

PURPOSE To develop a noninvasive measurement of tear oxygen tension and to determine tear oxygen tension and calculated oxygen flux rates during wear of contact lenses of varying oxygen transmissibility (Dk/L). METHODS The basis of the tear oxygen tension (PO2) measurement is phosphorescence quenching of Pd-meso-tetra-(4-carboxyphenyl) porphine by oxygen. A fiber-optic bundle, positioned appr...

OxygenDissociationCurvesfor Whole Blood,Recordedwithan Instrument That ContinuouslyMeasuresPo2and S02Independentlyat Constantt, p, and pH

We describe a method for recording oxygen dissociation curves for whole-blood specimens. The blood sample is placed in a thermostated measuring chamber, and Po2 and S02 are measured continuously by polarography and by reflectometry, respectively. During the recording of an oxygen dissociation curve, the po2 and S02 signals are stored in a data-acquisition system, while pH, Pco2 and temperature ...

Correction for Li et al., Functional connectivity arises from a slow rhythmic mechanism.

The mechanism underlying temporal correlations among blood oxygen level-dependent signals is unclear. We used oxygen polarography to better characterize oxygen fluctuations and their correlation and to gain insight into the driving mechanism. The power spectrum of local oxygen fluctuations is inversely proportional to frequency raised to a power (1/f) raised to the beta, with an additional posi...