Biomedical subjects

H Seno

Publications and source records attributed to H Seno.

At least 37 records · Page 2Linked to original sources

PubMed1994

Response of the sleep-wake rhythm to an 8-hour advance of the light-dark cycle in the rat.

We have studied the effects of an 8-h advance of the environmental light-dark (LD) cycle on the sleep-wake rhythm in the rat. Electroencephalograms and electromyograms were recorded simultaneously on chart paper through a two-channel telemetry system for 3 days before phase shift (baseline) and 8 days during and after phase shift. Phase advance of the LD cycle led to an increase in both non-rapid eye movement (NREM) and REM sleep. The amount of NREM sleep in the light period correlated positively with that in the preceding dark period for 4 days after phase advance. The duration of REM sleep in the light period correlated negatively with that in the preceding dark period. The results suggest that homeostatic control of the amount of NREM sleep between the preceding dark period and the following light period is disturbed by phase advance of the LD cycle.

Activity Cycles↗

PubMed1994

[A case of neuro-Behçet's disease with numerous hypertrophied and proliferated dendrites in the inferior olivary nucleus].

A 32-year-old man suffering from iritis, erythema, and recurrent oral aphthae showed signs of involvement of the central nervous system for 8 years before his death. Behçet disease was diagnosed. He showed neurologic symptoms, such as facial nerve palsy, gait disturbance, and pathological reflexes, and psychiatric symptoms, such as euphoria, disinhibition, and irritability. Characteristic neuropathologic findings were hypertrophy of the bilateral olivary nuclei with marked hypertrophy and proliferation of dendrites, which have been extremely rare in the reported autopsy cases of neuro-Behçet disease. Most changes were observed in the brainstem. Many microspongionecrotic foci were fused to from glial scars with marked lymphocytic perivascular infiltration. In addition, lesions were found throughout the spinal cord; degenerative changes were found in the lateral corticospinal tract, posterior colum (especially the fasciculus gracilis), and anterior and posterior spinocerebellar tracts. We believe, on the basis of the following neuropathologic findings, that the cause of the olivary pseudohypertrophy with dendritic hypertrophy and proliferation was a denervational process: (1) bilateral red nuclei were intact and (2) bilateral tegmental tracts had degenerated from the lower portion of the pons to the periphery of olivaly nuclei.

Behcet Syndrome↗

PubMed1994

Screening, identification and determination of the two new hypnotics zolpidem and zopiclone.

This article reports basic analytical data for screening and detection of the hypnotics zolpidem (CAS 82626-48-0) and zopiclone (CAS 43200-80-2) by using corrected hR-values, GC (gas chromatography) retention indices, UV solvent spectra and remission spectra. Beside this a HPTLC (high-performance thin-layer chromatography)-procedure for quantification is described.

Azabicyclo Compounds↗

PubMed1993

Failure to verify high levels of pyrroloquinoline quinone in eggs and skim milk.

The levels of pyrroloquinoline quinone (PQQ) in eggs, skim milk and milk was re-examined by the use of gas chromatography/mass spectrometry. PQQ was extracted from the samples, after addition of [U-13C]PQQ as internal standard, with n-butanol and Sep-Pak C18 cartridges. After derivatization of PQQ with phenyltrimethylammonium hydroxide, molecular peaks at m/z 448 and 462 were used for detection of PQQ and [U-13C]PQQ, respectively, by selected ion monitoring. PQQ could be detected in eggs, skim milk and milk, but their levels were very low (e.g., egg yolk: 7.0 ng/ml; skim milk: 2.5 ng/g dry weight). Our data for eggs and skim milk are far below those measured by the redox cycling method of Gallop's group.

Animals↗

PubMed1993

Positive- and negative-ion mass spectrometry of diphenylmethane antihistaminics and their analogues and rapid clean-up of them from biological samples.

Positive-ion electron impact (PIEI), positive-ion chemical ionization (PICI) and negative-ion chemical ionization (NICI) mass spectra are presented for 15 compounds of diphenylmethane antihistaminics and their analogues, and each fragmentation pathway was analyzed. In the PIEI mode, molecular peaks were very small or missing for most compounds. Peaks at m/z 58, due to a dimethylaminomethyl group liberated, constituted base peaks in five compounds. Peaks at m/z 165 and/or 167, due to diaromatic rings plus a methyl group, appeared in most compounds. In the PICI mode, peaks due to M+H and M+C2H5 appeared in all compounds. Peaks due to diaromatic rings plus a methyl or ethyl group constituted base peaks in five compounds, which had an ether bond in their structures. In the NICI mode, anions at m/z M-H appeared in most compounds. Peaks at m/z 35 were observed for compounds having a chlorine group in their structures. Detection limits for total ion monitoring of these compounds were 20-50 ng on column in the PIEI mode, 100-200 ng in the PICI mode and 500-1000 ng in the NICI mode. A rapid and simple clean-up procedure of these drugs with use of Sep-Pak C18 cartridges is also presented. The drugs could be detected by gas chromatography with DB-1 and DB-17 capillary columns with satisfactory separation from impurities in their underivatized forms. The recovery of the drugs, which had been added to whole blood and urine, was more than 60% except for meclizine.

Benzhydryl Compounds↗

PubMed1993

An autopsy case of Binswanger's disease without hypertension and associated with cerebral infarction in the terminal stage.

We report here an autopsy case of Binswanger's disease (BD) without hypertension and associated with cerebral infarction in the terminal stage. The female patient, who was 74 years old at the time of death, had initially demonstrated manic-depressive disorder-like mental disorder, followed by dementia and neurological deficits. A brain CT scan showed white matter low attenuation bilaterally and symmetrically. BD was clinically diagnosed despite the lack of hypertension. In the terminal stage, she suffered an infarction in the left anterior cerebral artery region, and died of pneumonia. Neuropathologically, we found the infarction of the left anterior cerebral artery region, demyelination, fibrillary gliosis, lacunae and arteriosclerosis of the small arteries and arterioles in the white matter.

Aged↗

PubMed1993

[Crossed aphasia in a dextral patient--a case of sensory aphasia due to a right hemispheric lesion].

An extremely rare case of sensory aphasia due to a right hemispheric lesion in a 61-year-old, right-handed male is reported. He manifested jargon aphasia, constructional apraxia and ideational apraxia after an operation for right temporo-parietal cerebral hemorrhage. Standard language test of aphasia (SLTA) administered 6 months after the onset revealed disturbance of verbal comprehension and repetition, fluent jargon with many paraphasias and paragraphias. The brain CT, MRI and IMP-SPECT disclosed right temporo-parietal and angular lesions. There are two other reported cases of right posterior lesion (Puels et al. 1982, Habibs et al. 1983) accompanied by symptoms similar to those in this case, e.g., jargon aphasia, paragraphia and apraxia, and in these cases as well the right deep hemispheric lesion encompassed Wernicke's area. It is suggested that the right and left brain functions are reversed in this patient, because the symptoms of the dominant hemisphere such as sensory aphasia, constructional apraxia, and ideational apraxia were associated with the lesion of the right hemisphere.

Aphasia↗

PubMed1993

Determination of some butyrophenones in body fluids by gas chromatography with surface ionization detection.

Haloperidol, moperone, pipamperone and bromperidol were found measurable with high sensitivity by gas chromatography (GC) with surface ionization detection (SID). The calibration curves using moperone as internal standard were linear in the range of 0.4-4 pmol on column for haloperidol, pipamperone, and bromperidol. The detection limit of the drugs was about 0.1 pmol on column. For their actual determination with forensic samples, a detailed procedure for their extraction from human whole blood and urine was established with Sep-Pak C18 cartridges. The recovery of the 4 drugs, which had been added to whole blood and urine, was more than 90%. Haloperidol in whole blood and urine of a schizophrenic patient, who had been administered with this drug (3 mg/day p.o.), could be quantitated by the present GC-SID, and the levels were 7.18 and 43.2 pmol/ml, respectively.

Butyrophenones↗

PubMed1993

Rapid extraction of methamphetamine and amphetamine in body fluids with Bond Elut SCX cartridges before capillary gas chromatography.

A simple and rapid method for extraction of methamphetamine and amphetamine from human whole blood and urine with Bond Elut SCX cation exchanger cartridges is presented. Detection of the stimulants was made by capillary gas chromatography (GC) with flame ionization detection after derivatization with trifluoroactic anhydride. The compound-containing samples, after mixing with 0.05 M potassium phosphate buffer (pH 7.8), were directly applied to the cartridges, washed with 20 ml of 50% methanol in water and eluted with methanol-HCl (240:1). The recoveries of both methamphetamine and amphetamine were close to 100%. The background noises for Bond Elut SCX cartridge extraction were much smaller than those for Sep-Pak C18 cartridge and diethyl ether extractions.

Amphetamine↗

PubMed1992

Trace levels of pyrroloquinoline quinone in human and rat samples detected by gas chromatography/mass spectrometry.

A detailed procedure for the assay of free pyrroloquinoline quinone (PQQ) in human and rat samples by gas chromatography/mass spectrometry (GC/MS) has been established with stable-isotopic PQQ as internal standard. PQQ was extracted from the samples, after addition of the internal standard, with butanol under acid conditions and with Sep-Pak C18 cartridges. After derivatization of PQQ with phenyltrimethylammonium hydroxide, molecular peaks at m/z 448 and 462 were used for detection of PQQ and [U-13C]PQQ by selected ion monitoring, respectively. Trace amounts of free PQQ were detected in eight organs, plasma and urine of the human, and in three organs of the rat. The PQQ level was highest in the human spleen (5.9 +/- 3.4 ng/g tissue, followed by the pancreas and lung, and it was below detection limits for human brain and heart. Trace levels of PQQ were also found in rat small intestine, liver and testis. Our data are far below those measured by the redox cycling method of Gallop's group for human plasma, adrenal and urine.

Animals↗

PubMed1992

Rapid isolation with Sep-Pak C18 cartridges and capillary gas chromatography of triazine herbicides in human body fluids.

A simple and rapid method, for the isolation of eight triazine herbicides from human serum and urine, using Sep-Pak C18 cartridges is presented. After mixing with distilled water, serum and urine samples containing the herbicides, were loaded on Sep-Pak C18 cartridges and eluted with either chloroform only or chloroform/methanol (9:1). The herbicides were detected by capillary gas chromatography with both flame ionization detection (FID) and nitrogen-phosphorus detection (NPD). Separation of eight triazine herbicides from each other and from impurities was generally satisfactory with the use of a non-polar DB-1 capillary column. Recovery of most compounds was excellent for both chloroform and chloroform/methanol (9:1) as elution solvents. Backgrounds were cleaner and evaporation time was shorter for the chloroform only than for the chloroform/methanol (9:1). The NPD gave sensitivity more than 10-20 times higher than that of FID.

Chromatography, Gas↗

PubMed1992

Diurnal monoamine variation in young and old rats: a microdialysis study.

The levels of striatal extracellular DA, DOPAC, HVA and 5-HIAA significantly decreased in aged rats compared to young adults. The magnitude of age-related reduction was greater in dopaminergic than serotonergic substances. The levels of striatal extracellular monoamines in young adult rats showed significant diurnal variations. On the other hand, these substances of aged rats, except for HVA, did not exhibit significant diurnal variations. Enriched environment housing increased levels of striatal extracellular DOPAC in aged rats, but did not influence on the age-related changes of diurnal variations in the striatal extracellular monoamines.

Aging↗

PubMed1992

[An autopsy case of ataxic form of Creutzfeldt-Jakob disease].

An autopsy case of ataxic form of Creutzfeldt-Jakob disease (Brownell and Oppenheimer, 1965) was reported. The patient, a 71-year-old male, noticed ataxic gait at the beginning of June in 1988, and was admitted to the Hiroshima City Hospital for the neurological examination at the end of June. He showed ataxia of the left arm and legs and diplopia. Gradually he became delirious at night. On July 16, tremor-like involuntary movement of the left hand was noticed. On July 20, he became somnolent and doubly incontinent. Myoclonus and paratonic rigidity were also observed. The EEG showed periodic synchronous discharge on July 25. The brain CT and MRI were normal. He became apallic gradually and died on October 28. The duration of illness was 5 months. At autopsy, brain weighed 1000gr. Cerebral atrophy and slight enlargement of the ventricles were observed. The cerebellum was also slightly atrophic. Histologically, the destruction of the cerebral cortical layer, slight sieve-like spongy state of the neuropil, slight neuronal loss of the thalamus and sieve-like spongy state of the striatum were observed. The cerebellar lesion was the most severe, where granular cell loss and gliosis of the cortex were observed.

Aged↗

PubMed1991

Failure to verify high activities of polyamine oxidase in pregnancy serum.

The activity of polyamine oxidase in human pregnancy serum was measured by our new specific method with radioisotopic N1-acetylspermine as substrate. The activity in pregnancy serum was very low and did not increase during gestation; it was not higher than that in nonpregnancy serum. The high polyamine oxidase activities previously reported by others appear to result from contamination with diamine oxidase, the level of which is high in pregnancy serum.

Brain↗

PubMed1991

Quantitative analysis of chlorpromazine by electron spin resonance (ESR) spectroscopy.

A simple and sensitive method is described for quantitative analysis of chlorpromazine in blood, serum, urine and tissue homogenate. The chlorpromazine cation radical produced by adding perchloric acid and 2,3-dichloro-5,6-dicyano-p-benzoquinone to the sample can be detected by the ESR method at room temperature. The sensitivity limit is 10 ng, that is, 20 microliters of the solution containing 0.5 microgram chlorpromazine/ml. The time needed for the measurement is within 10 min. The chlorpromazine radical thus produced is very stable; for example, 95% of the radical was observed after 24 h. The advantage of this method is discussed by comparing with the ordinary spectrophotometry which requires the purification of the sample.

Chlorpromazine↗

PubMed1991

Positive and negative ion mass spectrometry and rapid isolation with Sep-Pak C18 cartridges of ten local anaesthetics.

The positive ion electron impact (PIEI), positive ion chemical ionization (PICI) and negative ion chemical ionization (NICI) mass spectra and a rapid isolation procedure using Sep-Pak C18 cartridges are presented for ten local anaesthetics. In the PIEI mode, molecular peaks were very small or missing for most compounds. Peaks at m/z 86 due to the diethylaminoethyl or propylaminoethyl group constituted base peaks in six compounds. In the PICI mode, peaks due to M + H and M + C2H5 appeared. The cation at m/z 86 was also observed for the six compounds. This ion seems useful for the screening of local anaesthetics. In the NICI mode, anions at m/z M - H constituted base peaks for all compounds, peaks at m/z M + 12 appeared in many compounds. The total ion current in the PIEI and PICI modes generally gave higher sensitivity than in the NICI mode. Local anaesthetics present in whole blood or cerebrospinal fluid (CSF) could be rapidly isolated by use of Sep-Pak C18 cartridges with chloroform/methanol as an elution solvent. Their detection was possible using wide-bore capillary gas chromatography with SPB-1 and HP-17 wide-bore capillary columns with satisfactory separation from impurities.

Anesthetics, Local↗

PubMed1991

Real-time monitoring of slow-wave sleep by electroencephalogram variance.

Based on statistical variance as an index of electroencephalogram (EEG) parameters, we monitored slow-wave sleep in both humans and rats in real time and on-line with a widely used personal computer. This EEG variance method may be a useful tool to carry out biological rhythm research, including sleep studies.

Analysis of Variance↗

PubMed1990

A radioisotopic assay for polyamine oxidase.

A new radioisotopic assay for polyamine oxidase with N1-acetylspermine as substrate is presented. A modified method for the chemical synthesis of radioactive N1-acetylspermine, which gave a good yield, is also described. The reaction mixture, containing N1-[14C]acetylspermine and tissue homogenate, was incubated for the enzyme reaction and applied to a minicolumn of Amberlite CG-50. The reaction product 3-[14C]-acetamidopropanal did not adsorb to the column, but passed through it; thus the eluate could be directly subjected to liquid scintillation counting. The blank levels were low and relatively constant even with crude tissue homogenates. The detection limit obtained was 0.05 nmol per tube. This method is simple, highly sensitive, and highly specific.

Animals↗