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Biomedical subjects

Y Yamano

Publications and source records attributed to Y Yamano.

193 records · Page 11Linked to original sources
PubMed1980

Disc herniation of cervical spine.

The so-called soft disc herniation (the extruded or sequestered type) of cervical spine is relatively rare. For such a diagnosis precise neurological examination, myelography and discography are employed, but among them the specific reproduction of the patient's symptoms and the radiographic appearance of the disc by discography are especially important. Our 8 cases of soft disc herniation have been classified into central-paracentral and posterolateral types by the direction of extruded material from discographic pictures. Every type shows the complications of root pain. Discussion relates to the pain that accompanies this soft disc herniation. In half of the cases extruded disc material has been removed but others have been improved by conservative treatment.

Adult↗
PubMed1979

Electrodiagnosis of compression of individual nerve roots of the cauda equina.

Segmental electrodiagnosis of compression of individual nerve roots of the cauda equina has been attempted in 45 patients, including cases of disc hernia, spondylsis and spondylolisthesis. The needle electrode was inserted into the nerve root either just lateral to the intervetebral foramen or through the posterior sacral foramen. The recordings made on stimulating a single nerve root were somatosensory evoked potential, the cauda equina action potential and the M and H waves. Mixed spinal nerve root action potentials were also recorded by stimulating the sciatic, peroneal and tibial nerves. It was shown that a diagnosis could be made from the somatosensory evoked potential, the H wave and root pain reproduction, and also the diagnosis of a subclinical compression involvement. In other words, the neurophysiological state of dysfunction of individual roots in each aspect of compression can be expressed.

Action Potentials↗
PubMedDate not supplied

Parallel induction of cecropin and lysozyme in larvae of the silkworm, Bombyx mori.

Lysozyme activity in the hemolymph of Bombyx mori increased in parallel with cecropin activity after injection of the larvae with soluble peptidoglycan or UV-killed bacteria. The lysozyme and cecropin A genes were expressed in parallel in the fat body after injection of peptidoglycan as detected by northern blot hybridization. The elicitor specificity for lysozyme induction was identical to that for cecropin, suggesting a common mechanism for recognition of bacteria and following signal transduction introducing to the simultaneous synthesis of cecropin and lysozyme. Bacterial cells killed by UV-irradiation were also effective as elicitor when added to the fat body culture, suggesting that phagocytosis of bacteria by hemocytes may not be an essential process for the induction of antibacterial protein synthesis in the silkworm.

Animals↗
PubMedDate not supplied

Experimental stationary potential recorded with using spine and skull model.

This study aims at investigating experimentally the structural effects of various shapes of volume conductors, which are surrounded by an insulated skull and spinal canal model, on nerve action potentials (NAP). NAP were recorded through volume conductors inside and outside a model. We noted stationary potentials emerged at where the volume conductor made structural transitions. These results were analyzed using the field diagram of isopotential curves. The diagrams of the electrical field demonstrated that the stationary potentials arise owing to abrupt disequilibrium of the electrical field brought about by the change of the volume conductor surrounded by the insulated model.

Action Potentials↗