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Biomedical subjects

L H Roberts

Publications and source records attributed to L H Roberts.

6 recordsLinked to original sources
PubMed2001

Vertebral artery injuries.

Vertebral artery injuries are identified more frequently now than in the past for both penetrating and blunt trauma. This is as a result of increased suspicion and awareness, liberal use of color flow Doppler, CT angiography, and traditional four-vessel angiography. The vast majority of patients who are not exsanguinating at the time of presentation can be managed nonoperatively or by angiographic embolization. Operative management should be reserved only for patients with severe active bleeding or when interventional radiology fails. The surgical exposure is complex and demands excellent knowledge of the local anatomy.

Humans↗
PubMed1979

Cadmium and lead pollution from secondary metal refinery operations.

A study was made of cadmium and lead levels around a small secondary metal recovery factory as part of an environmental monitoring programme in a London borough. Lead levels were essentially typical for an urban environment whereas the levels of cadmium-in-air and in household dust gave rise to very considerable concern. Some of the problems associated with assessing the potential hazard and the steps taken to control the emission are considered. It is suggested that clearly-defined standards and procedures are necessary in order to deal efficiently with similar cases as they are discovered.

Adult↗
PubMed1975

The rodent ultrasound production mechanism.

Rodents produce two types of sounds, audible and ultrasonic, that differ markedly in physical structure. Studies of sound production in light gases show that whereas the audible cries appear to be produced, as in the case of most other mammals, by vibrating structures in the larynx, the ultrasonic cries are produced by a different mechanism, probably a whistle. 'Bird-call' whistles are shown to have all the properties of rodent ultrasonic cries and to mimic them in almost every detail. Thus it is concluded that rodents have two distinct sound production mechanisms, one for audible cries and one for ultrasonic cries.

Animals↗