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Biomedical subjects

T Maeda

Publications and source records attributed to T Maeda.

At least 1,585 records · Page 88Linked to original sources
PubMed1976

Comparative anatomy of the locus coeruleus. II. Organization and projection of the catecholamine containing neurons in the upper rhombencephalon of the frog, Rana catesbiana.

The organization and projection of the catecholamine (CA) containing neurons in the upper rhombencephalon were experimentally investigated with histofluorescence method in the brain of the bullfrog, Rana catesbiana. A small number of catecholamine containing neurons are located in the upper rhombencephalon. These neurons do not send ascending fibers to contribute CA projection to the forebrain, but give rise to relatively short axons to innervate the cerebellum and neighbouring reticular formation. Judging from their anatomical aspects, it seems that the structure homologous to the mammalian locus coeruleus is not present in the amphibian brain.

Animals↗
PubMed1976

[Clinical use of amoxicillin in the otorhinolaryngological field (authors's transl)].

Forty-eight cases of otorhinolaryngological infections were treated with amoxicillin (AMPC) at a daily dose of 750mg. The clinical and microbiological effects were studied, and the results were summarized as follows. 1. The subjects comprised 20 cases of otitis media, 10 of tonsillitis, 4 of sinusitis, 4 of chroditis, 2 bronchitis, 5 of furuncle of the ear and 3 of furuncle of the nose. The clinical effective rate of AMPC was 82.9%, and the microbiological effective rate was 80.6%. 2. The effect of AMPC against strains isolated from the above diseases was also studied. The effective rate against Streptococcus was 91.6% and against Staphylococcus 83.3%. 3. Side effects were observed in 4 cases (one of diarrhea, two of abdominal discomfort and one of lingual pain), but none of them was so severe as the use of AMPC should have been discontinued.

Adolescent↗
PubMed1975

A spin-label study on fusion of red blood cells induced by hemagglutinating virus of Japan.

Fusion of red blood cells (RBC) induced by hemagglutinating virus of Japan (HVJ) has been studied using a phosphatidylcholine spin label. The spin label was readily incorporated and diffused into the lipid bilayer portion of the viral envelope. The exchange broadening in the electron spin resonance (ESR) spectrum of densely labeled virus disappeared rapidly when the virus was mixed with RBC at 37 degrees. The spectrum gradually approached that of the host cell spin labeled with the phosphatidylcholine label. The results directly indicate transfer and intermixing of phospholipid molecules between the viral envelope and RBC membrane. The transfer reaction was strongly dependent on temperature. No transfer was observed at lower temperatures where the virus adsorbed to the cell and caused aggregation but no hemolysis and fusion. The transfer rate remained negligibly small until 19 degrees and increased rapidly between 25 and 30 degrees. The virus-induced hemolysis showed similar temperature dependence. The transfer rate was greatly reduced under inhibitory conditions of fusion: glutaraldehyde treatment of RBC, trypsin treatment of HVJ, or the presence of concanavalin A. Only slight transfer was observed from fusion-inactive influenza virus to RBC. The transfer was greatly enhanced by the help of HVJ. The close parallelism suggests that the transfer and intermixing are necessary steps to the cell fusion. The transfer rate was dependent on fluidity of the host cell membrane and independent of the viral dose. The virus-induced transfer of phospholipid molecules between RBC's was also detected by the spin label. Its temperature dependence was quite similar to that for the virus-to-cell transfer. The intercellular transfer was nearly proportional to the viral dose.

Cell Fusion↗
PubMed1975

Hypothalamic-pituitary functions in patients with idiopathic pituitary dwarfism.

To investigate hypothalamic-pituitary functions and the primary site of the lesion in idiopathic pituitary dwarfism, various pituitary function tests, especially the pituitary hormone responses to the hypophysiotropic hormones were studied in 23 patients with idiopathic pituitary dwarfism. A few cases showed slight responses of GH to GH stimulation tests. Gonadotropin deficiencies were most frequently noted among pituitary hormones. The basal levels and the responses of plasma LH and FSH to LH-RH test were diminished markedly in all of the cases except in 5 cases with isolated GH deficiency. Responses of LH and FSH to LH-RH improved markedly after a long term administration of LH-RH for a period of one month in 2 patients with gonadotropin deficiency. As to TSH axis, half of the cases accompanied hypothyroidism. However, the responses of TSH to TRH were normal in all of the cases regardless of the thyroid function. The basal levels and the responses of plasma cortisol and 11-deoxycortisol to the rapid metopirone test were also impaired in about half of the cases. Basal levels of plasma prolactin were normal in all of the cases and the responses of prolactin to TRH were normal in cases with normal thyroid function, but slightly delayed in cases with hypothyroidism. It is concluded from the above observations that the incidences of various pituitary hormone deficiencies were quite high in this disorder and hypophysiotropic hormone deficiencies may cause pituitary hormone deficiencies. Therefore, it is suggested that the primary site of the lesion in this disorder might be at the hypothalamus.

Adolescent↗
PubMed1975

Viral hepatitis B and aplastic anemia.

Although many cases of hepatitis associated with aplastic anemia have been described, the nature of hepatitis is not fully understood. There has been so far no report of hepatitis-B-antigen-positive case. A case of acute viral hepatitis B developing aplastic anemia is presented.

Aged↗
PubMed1975

Brain scan in cerebrovascular "Moyamoya" disease.

Brain scans were abnormal in 2 of 6 patients with cerebral "Moyamoya" disease. The spatial and temporal scan patterns were analogous to those described in conventional cerebral infarction. Cerebral infarction due to emboli resulting from mural thrombi may explain the uptake of radioisotope. None of the scans was abnormal in 4 adult patients in which the disease was complicated by subarachnoid hemorrhage.

Adolescent↗