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Biomedical subjects

W F Long

Publications and source records attributed to W F Long.

At least 109 records · Page 6Linked to original sources
PubMed1980

Evidence for antithrombin III involvement in the anticoagulant activity of cellulose sulphate.

1 Cellulose sulphate, like heparin, prolonged the clotting time in partial thromboplastin time (PTT) assays, inhibited the amidolytic activity of thrombin, was without effect on amidolysis catalysed by activated coagulation factor X(Xa), and potentiated the inhibition of both thrombin and Xa by antithrombin III (AT). 2 The anticoagulant activity of cellulose sulphate in PTT assays was, like that of heparin and heparin sulphate, but unlike that of dermatan sulphate, reduced by prior incubation of plasma with antiserum specific for AT. 3 These results, which suggest that the anticoagulant activity of cellulose sulphate is at least partially mediated through AT, are discussed in terms of the structural features of polysaccharides required for AT activation.

Adolescent↗
PubMed1978

Matrix optics of catadioptric systems.

Analysis of an optical system that contains a combination of reflecting and refracting elements may be very cumbersome by conventional vergence methods, especially if the system contains a large number of elements. This paper presents an algorithm that permits simple and rapid analysis of the paraxial optics of such systems and presents examples of optometric interest.

Eyeglasses↗
PubMed1977

A case of elevated intraocular pressure associated with systemic steroid therapy.

Although it is well known that topically administered steroids can increase intraocular pressure systemically administered steroids are much less frequently implicated in episodes of ocular hypertension. In the case reported, a marked increase in intraocular pressure was apparently caused by seroids used in treating poison ivy dermatitis. Pressures returned to normal shortly after the drug was withdrawn.

Adult↗
PubMed1976

A matrix formalism for decentration problems.

A matrix approach to decentration problems is presented which reduces the common decentration problems of ophthalmic optics to simple matrix multiplications. The formalism also leads to an alternative derivation of Thomson's formulas for obliquely crossed spherocylindrical lenses.

Lenses↗
PubMed1975

The endpoint of laser speckle pattern meridional refraction.

Motion of the speckle pattern observed by an ametrope viewing laser light reflected from a rotating cylinder with a matte surface is discussed. Mathematical expressions are derived for the apparent speed and direction (angular velocity) of the pattern when spherical neutralizing lenses are put in place and conditions for an endpoint appropriate for meridional refraction are discussed.

Astigmatism↗