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Biomedical subjects

K Fujii

Publications and source records attributed to K Fujii.

At least 973 records · Page 54Linked to original sources
PubMed1976

A case of new dysautonomia-like disorder found in Japan. I. Clinical and metabolic studies.

A case of new dysautonomia-like disorder in a Japanese infant is reported. The patient showed almost all of the essential criteria for the diagnosis of familial dysautonomia. Results of pharmacologic tests and urinary excretion patterns of catecholamines and their metabolites were also compatible with the disorder. But he lacked some important clinical findings, such as lifelong hypolacrimia, skin blotching, excessive sweating and labile blood pressure. Precise observations of clinical features and literatures on non-Jewish cases of familial dysautonomia lent evidence that this case suffered from a new dysautonomia-like disorder.

Child↗
PubMed1976

Aging of human bone and articular cartilage collagen: changes in the reducible cross-links and their precursors.

The age-dependent changes in reducible collagen cross-links, Schiff bases and their precursors were followed for human bone and articular cartilage throughout the whole life span from 3 to 89 years of age. With aging, the reduced Schiff bases dihydroxylysinonorleucine remarkable decreased, wheras hexitollysine peaks increased significantly in both collagens. Dihydroxynorleucine, the precursor of the cross-link, was found to increase slightly with age. But the changes in hydroxylysinonorleucine and lysinonorleucine were comparatively small. These changes were discussed in relation to the increased insolubility observed in both collagens at higher age.

Adolescent↗
PubMed1976

[The central neural mechanism of the gastric motility in the dog's medulla oblongata on the vagal inhibitory and excitatory reflexes (author's transl)].

The influences of the vagal inhibitory and excitatory reflexes on the gastric motor centers in the dog's medulla oblongata were investigated. Dogs were anaesthetized with Nembutal, and supplemented Gallamine at need. The brain stem was transected on the level of inferior colliculi of midbrain, the spinal cord transected on the level of between C1 and C2. Bilateral splanchnic nerves were also severed. Electrical activities from the inhibitory and excitatory areas in medulla oblongata were recorded by using a concentric circle electrode which was inserted into medulla oblongata from the dorsal surface of it. Following results were obtaind. 1) Electrical activities of the gastric inhibitory areas were classifed into three types (see Table 1). Type I: The augmentation of electrical activities of the gastric inhibitory areas during theinhibitory reflex were associated with the diminution of them during the exictatory reflex. Type II: Although electrical activities of the gastric inhibitory areas were augmented during the inhibitory reflex, any changes of them were not obtained during the excitatory reflex. Type III: Any changes of electrical activities of the gastric inhibitory areas were not obtained during both inhibitory and excitatory reflexes. 2) Electrical activities of the gastric excitatory areas were classified into two types (see Table 2). Type I: The diminution of electrical activites of the gastric excitatory areas during the inhibitory reflex were associated with the augmentation of them during the excitatory reflex. Type II: Although any changes of electrical activities of the gastric excitatory areas were not observed during the inhibitory reflex, they were augmented during the excitatory reflex.

Animals↗
PubMed1976

A mechanochemical model for the steady and transient contractions of the skeletal muscle.

A mechanochemical model for muscle contraction was presented which consisted of three subsystems: the regulatory mechanism of contraction by Ca ion, the cross-bridge cycle coupled with actin-myosin interaction and the dynamics of contraction with an external load. It was assumed that both the rate constant of the cross-bridge cycle and the net force of the cross-bridge were linear functions of the sliding velocity. Most parameters in the model were determined from the experimental data, but several were estimated by simulation techniques. The model adequately described the force-load-velocity relation, the rates of energy and heat output as well as some basic mechanical properties of muscle. Not only the steady-state contraction but also the twitch response could be explained by the model. Time courses of tension and shortening during isometric and isotonic twitches were calculated by the model on a digital computer. The calculated curves agreed satisfactorily with the experimental ones obtained from the frog semitendinosus muscle. The rate of tension rise of the isometric twitch was shown to attain the peak at nearly the same time as does the calculated Ca concentration curve.

Actins↗
PubMed1976

Tumor induction by a single subcutaneous injection of sterigmatocystin in newborn mice.

Sterigmatocystin, a mycotoxin produced by Aspergillus versicolor, Aspergillus sydowi, Aspergillus nidulans, and a species of Bipolaris, was given to newborn BALB/c X DBA/2F1 (hereafter referred to as CD2F1) mice by a single s.c. administration in 1% gelatin suspension. In an acute toxicity study, the maximum tolerated dose of sterigmatocystin was 5 mug/g body weight. In a chronic study, a single s.c. injection of 5, 1, or 0.5 mug/g body weight gave rise to high incidences of lung and liver adenomas when the animals were killed at the end of 1 year. The incidence of both tumors in mice at the dose of 5 mug/g body weight was statistically significant, and the incidences of lung tumor in female mice and of liver tumor in male mice at the dose of 1 mug/g body weight were also statistically significant, compared with tumors in control mice. Other tumors also were induced in treated mice (two malignant lymphomas and one adenoma of the submaxillary gland), in contrast to a zero incidence in vehicle control mice. These results confirm that a small quantity of sterigmatocystin induces tumors of lung and liver and that the dose of sterigmatocystin is related to the incidence of tumors in mice.

Adenoma↗
PubMed1975

Isolation and structure of a cross-linked tripeptide from calf bone collagen.

A cross-linked tripeptide has been isolated from alkaline hydrolysates of NaB3H4-reduced calf bone collagen. The peptide contains dihydroxylysinonorleucine, the most abundant cross-link in bone collagen, and it has a single N-terminal proline and a single C-terminal valine. These amino acids are in peptide linkage with the cross-link, in a trans configuration with respect to the secondary amine.

Animals↗
PubMed1975

Intussusception in children: hydrostatic reduction.

The records of 104 patients with the diagnosis of intussusception who were admitted to the Saisei-kai Suita Hospital during the past five years were reviewed. There were no deaths. All patients were treated primarily by barium enema with a successful reduction rate of 82%. Successful reduction requires the use of general anesthesia, repetition of the procedure after a three- or five-minute waiting period, use of a balloon catheter, and manipulation. The most important points are early detection of this disease by the pediatrician and enthusiasm on the part of the surgeon.

Age Factors↗
PubMed1975

[An atropine-resistant contraction of dog's stomach in response to stimulation of the vagus and splanchnic nerves (author's transl)].

1. A study was made in vivo experiments of a contraction of stomach of the dog to stimulation of the extrinsic nerves, medulla oblongata and thoracic cord in the presence of atropine. 2. An atropine-resistant contraction of stomach was produced without accompanying any preceding relaxation of stomach motility. It seems to deny that an atropine-resistant contraction appears to be a rebound phenomenon. 3. An atropine-resistant contraction was produced in prolonged stimulation. A delay of latency to produce a contraction of stomach was more than 27 sec and a contraction was decreased in amplitude and frequency in the presence of atropine.

Animals↗
PubMed1975

[Effects of physostigmine and duvadilan on an atropine-resistant contraction of dog's stomach (author's transl)].

Effects of atropine, physostigmine, duvadilan and tetrodotoxin on the mechanical activity of the longitudinal muscle preparation of dog's stomach in vitro experiments and on the motility of stomach in the same animal in vivo experiments were investigated. 1. The latency of an atropine-resistant contraction which was produced by stimulation of vagus nerve was increased in period in accordance with the augmentation of concentration of atropine in vitro experiments. 2. Physostigmine reconstructed the atropine-resistant contraction which was abolished by duvadilan as well as the cholinergic contraction which was abolished by atropine in vivo experiments. 3. Duvadilan abolished the cholinergic and atropine-resistant contractions in vitro, but in vivo experiments duvadilan abolished only the atropine-resistant contraction. 4. An atropine-resistant contraction was completely abolished by administration of tetrodotoxin. But the direct electrical stimulation of the muscle caused the contraction of it which was blocked by tetrodotoxin.

Animals↗