Interactions of CF1, the coupling factor of photophosphorylations, with chloroplast lipids. Monolayers studies.

Surface pressure and surface potential of monolayers at a water-air interface show no polar interactions between the chloroplast total lipids and the polar protein CF1. The two components are perfectly miscible in mixed monolayers. It follows that CF1 interacts with the hydrophobic parts of the lipid molecules and that, in vivo, CF1 could penetrate in the hydrophobic core of the membranes.

Timolol. Canadian multicenter study.

This collaborative study involves 39 investigators and shows the effects of timolol maleate when used short-term on large numbers of patients (418). Intraocular pressure response is excellent. Statistical analyses of pressure response are done using random sampling.

The computerized tomographic appearance of angiographically occult arteriovenous malformations of the brain.

Eight patients with a histologically proven angiographically occult arteriovenous malformation of the brain had plain and infused computed tomographic (CT) examinations. In five cases angiography revealed a hypovascular mass in three cases the angiogram was normal. On CT examination a high density lesion (six cases) and ventricular asymmetry (five cases) were demonstrated.

Tuberculous brain abscess: report of a case with computed tomography correlation.

A 27 year-old Vietnamese male immigrant to Canada developed a hemispheric cerebellar abscess. The patient presented at the hospital with osteomyelitis of the 5th finger of the left hand. He complained of lassitude, weight loss, and early morning headache, nausea, and vomiting, and he developed a left facial weakness.

Neonatal intracranial hemorrhage. A clinical and serial computerized tomographic study.

Forty-six neonates with intracranial hemorrhage were classified into three groups on the basis of the major computerized tomography (CT) scan findings: Group I consisted of 24 cases of subarachnoid hemorrhage, Group II 20 cases of intracerebral and/or intraventricular hemorrhage, and Group III two cases of subdural hemorrhage. The initial scans in Group I showed blood in the interhemispheric fissure and the supratentorial recess. Sixty percent had an associated hypodensity in the frontal and/or parietal areas, thought to be an indication of ischemia.

Aggregation of chlorophylls in monolayers. Part IV. The reorganisation of chlorophyll a in multilayer array.

The nature of the interaction between the chlorophyll a molecules in multilayer arrays obtained by the Langmuir-Blodgett technique is examined by electronic and infrared spectroscopies. Following the deposition of the multilayers, we observed a blue shift with time in the electronic spectra. This effect is monitored by infrared spectroscopy.

Computerized tomography findings in arteriovenous malformations of the brain.

Computerized tomography (CT) scans of 54 patients with an arteriovenous malformation (AVM) of the brain were reviewed. The 31 males and 23 females (mean age: 33 years) were classified according to clinical presentation: 1) intracranial hemorrhage (30 patients); 2) seizure disorder (19 patients); and 3) other neurological disturbance (five patients). A brain hematoma was identified in all of the patients in the hemorrhage group have a CT scan within 1 week of the bleed.

Design and characteristics of a cell for photoacoustic spectroscopy of condensed matter.

We describe a photoacoustic cell which is simple to use, easy to construct, and which gives a great sensitivity, expressed as a signal-to-noise ratio of 3000. Calibration of the cell indicates that it can be used with confidence as a general purpose photoacoustic cell.

Aggregation of chlorophylls in monolayers.

The interaction of dioxane vapor with monolayer and multilayers of chlorophyll has been studied using electronic and infarared spectroscopies. Our results indicate the formation of a complex implying the oxygene of the dioxanc molecules with the magnesiums of adjacent chlorophyll molecules. These results are consistent with the molecular orbital calculations, using the "free electron network" method done by Le Brech, Leblanc and Antippa [Chem.

A theory of the mechanism of cerebral vasospasm and its reversal, the role of calcium and cyclic AMP.

It is proposed that the basic mechanism of vasospasm which sometimes follows subarachnoid hemorrhage is dependent on increased free intracellular calcium ion produced by spasmogens from closely applied extravasated blood. Relaxation of this spasm occurs when the intracellular cyclic AMP levels are raised, resulting in sequestration of calcium ion by the vascular smooth muscle cell sarcoplasmic reticulum.

A 'black cornea' secondary to topical epinephrine.

We report a case of 'black cornea" secondary to topical epinephrine therapy and present the biochemical analysis of the lesion. The formed pigment is a melanin and not the intermediate substance, adrenochrome, as has been previously reported. The pathogenesis of melanin deposition is reviewed and a hypothesis of epinephrine-melanin binding is suggested.

Posterior polymorphous corneal dystrophy and juvenile glaucoma: a case report and brief review of the literature.

A family with posterior polymorphous corneal dystrophy is presented that includes a child with juvenile glaucoma. A review of the literature reveals an increased incidence of juvenile glaucoma associated with this dystrophy. It is of practical importance that the dystrophy be recognized and glaucoma be ruled out as the latter is asymptomatic in the infant.

Cyclic adenosine monophosphate antagonism of prostaglandin induced vasospasm.

Prostaglandin F2alpha was applied topically to the transclivally exposed basilar artery of the cat. The resultant vasoconstriction and its reversal by dibutyryl cyclic adenosine monophosphate was recorded photographically and measured, and the results analyzed statistically. Arterial BP, pCO2' pO2 and pH were determined to insure that the vascular responses were not due to any general physiological disturbance.