[Spontaneous dissection of the carotid artery]. / Dissection artérielle carotidienne spontanée.

Spontaneous dissection of the carotid artery is a rare cause of stroke. A 54-year-old man was hospitalized for transient ischemic attack. Duplex ultrasound of cervical arteries showed indirect signs of a dissection of the carotid. Magnetic resonance angiography showed a dissection of the post bulbar segment of the right carotid artery and a right ischemic stroke. Angiography confirmed the diagnosis. The anti-coagulant treatment initialized as soon as the diagnosis of dissection was suspected, was stopped because of a massive cerebral infarct. The course was unfavorable with a persistent hemiplegia.

Three-dimensional reconstruction and averaging of 30 S ribosomal subunits of Escherichia coli from electron micrographs.

From the micrographs of a tilt series, several particles of negatively stained 30 S ribosomal subunits of Escherichia coli were three-dimensionally reconstructed. Three of them showing similar orientation with respect to the supporting foil were averaged after alignment by newly developed three-dimensional correlation methods. As a main result we found a stained channel-like structure inside the particle. We tentatively propose that this corresponds, at least partially, to positively stained segments of the 16 S RNA.

Health care delivery in the 1980s: the consumer's perspective.

Consumers are calling for more choices in health care services in the 1980s. They want to be able to choose among private physicians, HMOs, nurse practitioners, paraprofessionals, and insurance coverage. Faith in technology will decrease, while appropriateness and accessibility of care for population groups now poorly covered will be emphasized.