Multiple nonanastomotic aneurysms in an external velour ringed Dacron femoropopliteal vascular prosthesis

Nonanastomotic aneurysms of arterial prosthetic grafts are an infrequent but well-documented complication of arterial bypass surgery. Several cases of nonanastomotic aneurysm formation of the external velour-type Dacron graft have been reported. We present a case of an external velour ringed Dacron (Sauvage EXS) femoropopliteal bypass graft with multiple nonanastomotic aneurysms. An extensive review of the English literature shows this to be the first reported case of multiple aneurysms occurring in this type of prosthesis.     

Individual growth in stature: a comparison of four growth studies in the U.S.A

Patterns of growth in stature of subjects from the four major U.S. longitudinal growth studies are compared by means of a two-component model for individual growth. Problems inherent in the comparison of data from independent growth studies, such as those arising from different methods of sampling subjects and scheduling measurements and the occurrence of atypical subjects, are considered and solutions are offered. Statistical tests of the individual growth parameters revealed significant, but small, differences among the samples in the magnitude of the contributions of prepubertal and adolescent growth to mature stature and in the velocity of growth. No differences between samples in the timing of the adolescent component were detected.     

In situ morphologies of deep-sea and sediment bacteria

Deep-sea and sediment bacteria at the bottom of an approximately 1200-m water column were sampled by means of pressure vessels attached to a remote underwater manipulator. Cells were immediately fixed in situ with glutaraldehyde, and after processing in the laboratory their morphologies were observed with the scanning electron microscope. Most bacteria were coccoid or rod-lide and less than 0.4 mum in diameter or width. Few filamentous bacteria were observed. Bacteria were in aggregates or free-living. It is concluded that morphologies of deep-sea bacteria collected and fixed at the hydrostatic pressure of their environment are, in general, similar to the observed morphologies of deep-sea bacteria determined at 1 atm pressure after collection and decompression during ascent through the water column.     

Effects of short-and long-term administration of tricyclic antidepressants and lithium on norepinephrine turnover in brain

The findings summarized in this paper show that norepinephrine turnover in brain is decreased after acute administration of imipramine or desmethylimipramine but tends to increase during chronic administration of these tricyclic antidepressants. Similarly, it appears that there also may be important differences between the effects of acute and chronic administration of lithium salts on norepinephrine turnover in the central nervous system. Such changes in norepinephrine turnover that develop gradually over the course of long-term drug administration may help to explain the need for chronic administration of tricyclic antidepressants or lithium salts in the treatment of patients with affective disorders.