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Biomedical subjects

A Perramon

Publications and source records attributed to A Perramon.

At least 19 recordsLinked to original sources
PubMed1995

Comparison of ultradian and circadian oscillations of carbon dioxide production by various endotherms.

Carbon dioxide emission (VCO2) was computed every 20 min from continuous CO2 concentration recordings taken during 3-30 consecutive days, in strictly controlled environmental conditions, in 54 OF1 mice, 99 Japanese quail, 66 Sprague-Dawley rats, 50 Hartley guinea pigs, 7 chicks, for 7-15 days on 2 Cynomolgus monkeys, and for 24 h on 7 premature infants. This VCO2 shows circadian and ultradian oscillations that were analyzed for frequencies and amplitudes in light-dark 12-h alternation (LD 12:12), continuous light (LL), and continuous dark (DD). Circadians were not always identified or were often masked in LL or DD (mostly in guinea pigs, quail, and rats), while ultradians (tau > or = 40 min) were found in all species, at every time, and in all light regimens. Analysis of variance and chi 2 show significant (P < 0.001) interspecies differences for ultradian (1.07 < tau < 1.40 h) intervals and for circadian and ultradian VCO2 amplitudes. Relationships between ultradian and circadian VCO2 oscillations differ according to the species, ultradians appearing as an entity characteristic for each endotherm species.

Activity Cycles↗
PubMed1989

Ultradian and circadian CO2 emission variations in nocturnal and diurnal animals exposed to a light stimulus.

1. Carbon dioxide emission (VCO2) has been continuously recorded in three laboratory animal species (Sprague-Dawley rats, Japanese quail, Hartley guinea-pigs) which differ by their nocturnal and diurnal activities. A 100 lux stimulus has been delivered at various time intervals. 2. A regular alternation of 12, 3 or 1.5 hr light (L) and darkness (D) gives VCO2 circadian and ultradian rhythms of 24, 6 or 3 hr periods, respectively, in quail and rats. 3. Such circadian and ultradian LD rhythms are not induced in all guinea-pigs. 4. The amplitudes of the VCO2 responses are greatest at D----L when the animals have a maximum diurnal activity and at L----D when their maximum activity is nocturnal. 5. Interactions between circadian and ultradian rhythms are seen in all LD experiments, as well as in continuous light (LL) or continuous dark (DD). 6. No more well-marked or even inverted VCO2 responses to the light stimuli may occur after several days of exposure to these LD alternations.

Activity Cycles↗
PubMed1988

Sexual phenotype of avian chimeric gonads with germinal and stromal cells of opposite genetic sexes.

The respective roles of germinal and stromal cells in determining the sexual phenotype of the gonad were analyzed in chimeric gonads obtained by surgical recombination between young avian blastodiscs in ovo. Equivalent territories were exchanged between two blastodisc, in order that the germinal crescent and the gonad territory had a different origin (fig. 3). Embryos used for these experiments carried a sex linked pigment mutation, that made it possible to diagnose the genetic sexes of germ cells and stroma at the time when the gonad was retrieved for examination. On the basis of species, three types of combination were performed: chick germ cells in chick or quail stroma, quail germ cells in chick stroma. In each chimera, the genetic sexes of the two gonadal cell populations could be identical or opposite. However it appeared that the germ cell population was not always homogeneous. In some grafting schemes, ectopic germ cells, located outside the germinal crescent, contributed to the colonization of the experimental gonad. These germ cells were from the same territory as the stroma element of the gonad, i.e., they were of the same species and the same genetic sex. Whatever the case, in 87 chimeras that were studied, the sex phenotype of the gonads always corresponded to the genetic sex of the stroma. Thus the genetic sex of germ cells has no role in the sexual differentiation of the gonadal rudiments.

Animals↗
PubMed1985

Ultradian and circadian respiratory rhythms in grouped small laboratory vertebrate species as a method to assess the effects of environmental challenges.

The recording over several days of the respiratory gases of groups of different laboratory vertebrates (mice, rats, quails), placed in a chamber with controlled ventilation, and in standardized environmental conditions of temperature, humidity, light, noise and feeding, shows ultradian (tau less than 24 hr) and circadian (tau congruent to 24 hr) rhythms. A simple variance analysis method shows periodic carbon dioxide changes, due to different environmental stimuli. Societal, light, acoustical, carbon monoxide and starvation challenges are given as examples. This technique enables us quickly to collect, on a great number of animals, data which correspond to societal behavior changes peculiar to the considered species.

Acoustic Stimulation↗
PubMed1985

Biological parameters in Japanese quail genetically selected for resistance or sensitivity to an acute hypoxic survival.

Various biological parameters were measured in two strains of Japanese quail selected for their resistance (Ls+) or susceptibility (Ls-) to an acute normobaric hypoxic challenge. Adults of these two strains showed very little or no significant differences concerning body weights, carbon dioxide emission, photoperiodic (L----D and D----L) respiratory reactions, cloacal temperatures, heart rates and ECG QRSII amplitudes, red blood cell data, hemoglobin electrophoresis, and plasma corticosterone (before and after an hypoxic challenge). Enzymatic capacities of phosphofructo-and pyruvate kinases, of glucose-6-phosphatase, lactico- and malate-dehydrogenases, measured in brains and hearts, showed but few statistically significant differences. Changing societal contacts did not suppress the differences of acute hypoxic survival between the two strains. Several statistically significant differences which concern reproduction and eggs, and especially egg laying and egg water vapor conductance were noted between the two strains.

Animals↗
PubMed1983

Harmonic analysis of ultradian respiratory rhythms in four small laboratory vertebrates lit in LD12:12.

Fourier harmonic analysis has been applied to 20-min samples of VCO2, recorded every 12 sec over several (7-12) days, in one mouse, one rat, one guinea-pig, or one quail, maintained in controlled conditions of temperature, humidity and ventilation, and lit in LD12:12 (100 lux). The harmonic computations, during L and D of ultradian periods (1.2 hr less than tau less than 12 hr) evidence statistically significant differences in amplitude and phase between these four small laboratory species. These periodic respiratory differences correspond to discrepancies in their diurnal and nocturnal activities, and in their responses to light and dark.

Animals↗
PubMed1983

Inter and intraspecies genetic differences in survival to an acute carbon monoxide challenge in mice, rats, guinea-pigs, quails and chickens.

1. Groups of small laboratory vertebrates, of both sexes, have been submitted to an acute carbon monoxide challenge, close to a LD50. 2. An interspecific classification, from low to high CO sensitivity, gives: guinea-pigs-mice-chicks-rats-quails. 3. Interstrain statistical differences were observed in all species, with the exception of guinea-pigs. Furthermore, among two selected genotypes of Japanese quails, one was resistant to acute nitrogen hypoxia and to carbon monoxide intoxication and the other sensitive to both these types of hypoxia. 4. Interspecific comparisons show similarities of genetic differences to acute CO intoxication and acute nitrogen normobaric hypoxia.

Animals↗
PubMed1983

[Histogenetic study and mixed lymphocyte reaction in 2 lines of chickens homozygotic for haplotypes B14 and B19].

The histocompatibility status of homozygous chicken for B14 and B19 haplotypes of Hy-line stock origin was compared by skin grafts and the mixed lymphocyte reaction. No differences in graft survival (33 days) could be recorded in H-B compatible grafts in either haplotype tested. Reciprocal allografts however (B14 in equilibrium B19) were rejected within 12 days in both haplotypes. A weak stimulation index (1.3-1.9) persisted in individuals serologically identical with respect to the H-B complex whereas a strong index of 10.4 was obtained in allogeneic lymphocyte cocultures.

Alleles↗
PubMed1983

Evidence of genetic differences in acute hypoxia survival.

In a population of Japanese quail, a genetic selection was performed leading to two strains--one resistant and one susceptible to an acute hypoxic nitrogen challenge as well as to an acute carbon monoxide intoxication. Crossing these two strains gives an F1 hybrid whose survival to acute hypoxia appears to be very close to the susceptible strain. The difference in acute hypoxic survival already appears in embryos at the age of 12 d. Susceptibility to acute hypoxia seems to be a dominant character.

Animals↗
PubMed1979

[Ultradian (between 5 and 70 minutes) respiratory (VO2, VCO2) rhythms of 4 small vertebrates used in biomedical research].

Four laboratory Vertebrate species with a predominant activity, either diurnal (Coturnix coturnix japonica), nocturnal (Rattus norvegicus, Mus musculus), or equivocal (Cavia porcellus), present, in usual housing conditions (temperature 20 degrees C, hygrometry 60-70%, acoustical background 70 dB, LD12:12 lighting L = 150 lx), food and water ad libitum, ultradian respiratory (VO2, VCO2) rhythms of short periods. The frequencies of these rhythms are independent of food intake and activity variations correlated to the lighting phase and regimen (LD, LL). The period (tau) of these ultradian respiratory rhythms is in isolated animals, between 5 and 70 min., according to the species studied. Grouping of several individuals of a same species, in a ventilated chamber, modifies the statistical distribution of the periods of the ultradian rhythms, but does not change the interspecies differences.

Animals↗
PubMed1978

Heterosis in the codominance model: electrophoretic studies of proteins in the chicken-quail hybrid.

1. Electrophoretical comparisons was carried out on qualitative and quantitative differences of three proteins in the cock-quail hybrid: albumin, immunoglobulin and hemoglobin. All three components correspond to situations of codominance. 2. Heterosis was demonstrated twice: the immunological potentialities of the hybrid are increased by its possession of two types of Ig G; the affinity of hemoglobin for oxygen can be better regulated in the hybrid than in both parental species. 3. Proportions of the codominant parental components in the hybrid are different in the case of the three investigated proteins; this fact probably reflects the relative importance of the quantitative regulation of gene products in the hybrid.

Animals↗
PubMed1976

[Demonstration in Japanese quails of genetic differences in survival from hypoxia].

164 quails (Coturnix coturnix japonica; 94 males and 40 females), 27-55 days old and belonging to 9 families, each family being issued from a different couple of parents, were submitted to an acute nitrogen hypoxia which resulted in an overall mortality of 43.29%. The fact that a high statistically significant (p less than 0,001) heterogeneity was pointed out in these different families supports the existence of a genetic component of resistance towards hypoxia.

Animals↗