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Biomedical subjects

J Stríbrný

Publications and source records attributed to J Stríbrný.

At least 19 recordsLinked to original sources
PubMed2003

[Levels of psilocybin and psilocin in various types of mushrooms].

Psilocin and psilocybin are psychoactive components of mushrooms of the genus Psilocybe and many others (Panaeolus, Inocybe, Pluteus etc.). In our republic, several species of Psilocybe with a high content of these components can be found. In the present study, we give a semiquantitative content of psilocin and psilocybin in some of our mushrooms in dry substance (Psilocybe semilanceata, Psilocybe bohemica, Psilocybe arcana, Psilocybe cyanescens, Panaeolus acuminatus sensu Ricken, Inocybe haemacta and Pluteus salicinus). For quantification, the GC/MS instrumentation was applied. Psilocin and psilocybin were silylated by the derivatization agent N-methyl-N-trimet-hylsilyltrifluoroacetamide. As an internal standard, 5-methoxytryptamin was used. The results of this study prove the presence of at least three species of Psilocybe with a high content of psychoactive components growing in our republic: Psilocybe semilanceata, Psilocybe bohemica and Psilocybe arcana.

Agaricales↗
PubMed1999

[Diagnostic significance of mild hyperhomocysteinemia in a population of children with parents or grandparents who have peripheral or coronary artery disease].

BACKGROUND: A rise of the homocysteine plasma level--mild hyperhomocysteinaemia--is considered an independent risk factor for the development of vascular damage. It is due to hereditary deficiency of 5,10-methylene-tetrahydrofolate reductase with accentuation of vitamin deficiency (folic acid, vitamin B6 and B12). In previous studies the authors confirmed this fact in the population of patients with aortocoronary or peripheral arterial bypasses. The assumed autosomal recessive transmission of this deficiency should make it possible to detect carriers of this metabolic deviation already in childhood. By selective screening of the child population at risk it would thus be possible to detect affected subjects in time and prevent the development of vascular disease by preventive folate administration. METHODS AND RESULTS: In a group of 38 children and grandchildren from risk families where at least one of the parents or grandparents was operated on account of vascular obliterating disease the total homocysteine plasma level was examined by the chromatographic method. An increase of total homocystein (8.7 +/- 2.7 mumol/l) was found as compared with children from the non-risk population (5.4 +/- 1.8 mumol/l), (p < 0.001). The total homocysteine values however were dependent on the child's age and were more marked in children above 12 years of age. In the parental population mild hyperhomocysteinaemia was present in 38% of those with aortocoronary bypasses and in 43% of those with peripheral arterial bypasses. CONCLUSIONS: The authors found significantly elevated total homocysteine levels in the child population from risk families with obliterating vascular disease. The total homocysteine level depends on the child's age and is more markedly expressed in children above 12 years of age.

Adolescent↗
PubMed1997

[Hyperhomocysteinemia. A risk factor for the development of vascular diseases not associated with lipid levels].

BACKGROUND: Elevated total homocysteine plasma levels are considered a significant factor of vascular damage. As they are encountered in more than half the patients with atherosclerotic vascular damage the importance as a lipid-dependent or lipid-independent risk factor in the promotion of pathophysiological processes is discussed. METHODS AND RESULTS: In a group of 100 healthy subjects and 529 patients with indication for an aortocoronary or peripheral arterial bypass and in patients from the lipid clinic the mutual relation between total plasma homocysteine levels and selected indicators of the lipid metabolism was investigated. The following results more obtained: for total cholesterol a correlation coefficient of r = 0.26, for HDL-cholesterol r = 0.20, for LDL-cholesterol r = 0.21, for triacylglycerols r = 0.29, apolipoprotein A-I r = 0.06, apolipoprotein B r = -0.12 and for Lp(a) r = -0.03. To ensure correct evaluation of the homocysteine levels simultaneously also folate levels were examined (correlation coefficient r = 0.28), vitamin B12 r = (0.03) and fibrinogen r = (0.09). CONCLUSIONS: The authors did not detect an unequovical relationship between the total homocysteine level and selected lipid indicators in any of the patient groups (p < 0.05).

Adult↗
PubMed1985

Transplacental antibodies. Part III: Maternal antibodies against polioviruses, M. parotitidis and M. parainfluenzae.

In 1981 we examined 247 sera for the presence of antibodies against all three types of poliovirus and 253 sera for antibodies against M. parotitidis and three types of M. parainfluenzae viruses. The sera were obtained from the cord blood of mothers between 15 and 34 years of age. All mothers were divided into four age groups, each with primipara and multipara subgroups. The rate of seropositivity for type 1 and type 2 poliovirus-specific antibody was in all age groups higher than 90%, the overall seropositivity rate for type 3 poliovirus antibody was 83.6%, with 73.1% as the lowest rate for age group of youngest mothers. Significant seropositivity variations between the primipara and multipara subgroups were recorded only for type 3 antibody in the two age groups of oldest mothers (25-29 and 30-34 years). This is consistent with the assumed booster effect of Sabin vaccine strains on mothers of families with more than one child. Antibodies specific to mumps virus were present in the cord blood of 78.6% of all mothers and the rates of seropositivity were found to rise with the increasing age. Seropositivity for M. parainfluenzae type 1-specific antibody was demonstrated in 95.8%, for type 2-specific antibody in 98.9% and for type 3-specific antibody in 100% of mothers, which is suggestive of high herd immunity levels in the population.

Adolescent↗
PubMed1985

Transplacental antibodies. Part II: Maternal antibodies against the toxins of C. diphtheriae and C. tetani.

Examinations of 297 sera for diphtheria antitoxin and 160 sera for tetanus antitoxin were carried out in 1981. All sera were obtained from the cord blood of mothers between 15 and 34 years of age. The mothers were divided into four age groups each of which was further subdivided into the primipara and multipara subgroups. The aim was to assess the age-specific variations in response to active immunization against diphtheria and tetanus. The protective level of diphtheria antitoxin (at least 0.01 I.U./ml) was recorded in the serum of 96.3% of examinees and the rates of seropositivity were found to fall with increasing age. The protective level of tetanus antitoxin (at least 0.1 I.U./ml) was found in the serum of 95.2% of mothers. The serologic response encountered in groups of older mothers was a clear-cut demonstration that the country-wide mass immunization against tetanus carried out between 1974 and 1975 was highly effective and fully justified. The variations in the diphtheria and tetanus antitoxin levels found in the primipara and multipara subgroups were not statistically significant.

Adolescent↗
PubMed1984

Transplacental antibodies. Part I: Maternal antibodies against B. pertussis and B. parapertussis.

In 1981 a set of 256 of the umbilical cord blood collected from mothers between 15 and 34 years of age was serologically examined for specific antibodies against B. pertussis and B. parapertussis infections. The mothers were divided into four age groups, each with primipara and multipara subgroups, with the aim to assess age-related variations in specific immunity levels acquired as a consequence of active immunization against pertussis, or by clinical or subclinical infection with B. parapertussis (no specific immunization against B. parapertussis infection is carried out in Czechoslovakia). The percentage of mothers with B. pertussis-specific antibody was found to fall from 81% and 70% in the two younger age groups (15--19, 20--24 years) to 21.3% and 16.3% in the two older age group (25--29, 30--34 years). The variations between the primipara and multipara subgroups were not statistically significant. Antibody against B. parapertussis infection was present in 38.6% of all mothers, which is suggestive of a relatively high circulation of this agent in the population. In the two older age groups (25--29 and 30--34 years) multiparous mothers were found to have B. parapertussis antibodies at significantly higher rates than primiparous mothers, which seems to confirm the theory that B. parapertussis infection may serve as booster to immunity in mothers of families with more than one child.

Adolescent↗
PubMed1978

Electrical potential difference across the mid-term human placenta.

Electrical potential difference across the mid-term human placenta was recorded during hysterotomy. The average value registered was 2.7 mV (S.E. of mean=0.4 mV, n=7), fetus negative. From this value and the concentrations of Na, K, Ca, Cl and inorganic phosphate in maternal and fetal plasma the possible mechanisms of net transport from mother to fetus are inferred. It is concluded that of the above ions only the transport of Na is compatible with simple diffusion.

Action Potentials↗
PubMed1978

The distribution of sodium salicylate in the human fetus.

The distribution of sodium salicylate was investigated in the fetuses of 18 mothers in the fifth or sixth month of pregnancy which had to be interrupted for medical reasons. Ninety-six min after drug administration, the salicylic acid levels in mother and fetus blood are almost equal. The highest drug levels in fetus tissue were found in the kidney, the lowest in the brain. In amniotic fluid, only traces of salicylic acid were estimated. A limited number of suitable cases made the exact statistical evaluation impossible.

Adult↗