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Biomedical subjects

E Reichart

Publications and source records attributed to E Reichart.

At least 37 records · Page 2Linked to original sources
PubMed1979

Intracellular pH changes during experimental sustained hypercapnia.

During various time periods lasting 3--28 days rats were continuously exposed to FICO2 = 0.08 or 0.16 in normoxic conditions, pHi was measured by the 3H-inulin and 14C-DMO method in the erythrocyte, the gastrocnemius and in the whole body. The erythrocyte acid base disturbances were linked to the extracellular acidosis. The muscle and the mean body pHi developments were the same during 9 or 14 days depending on the FICO2. They diverged after 28 days at FICO2 = 0.08 (Tables and Fig. 2). This could be explained as an acid base reaction of the "non-muscular" part of the whole body intracellular compartment which may be different from the acid base development of the muscular mass. A short term (1 h) acute hypercapnia (FICO2 - 0.20--0.22) was superimposed on the sustained hypercapnia (FICO2 = 0.16). Acid base disturbance was greater when the acute hypercapnia was added at the beginning (3rd day) of the CO2 exposure (Fig.1).

Acid-Base Equilibrium↗
PubMed1979

The hepatic cytochrome level in the cat (Felis catus): normal value and variations in relation to some biological parameters.

1. The average level of the hepatic hydroxylating cytochrome was determined in the cat (0.380 +/- 0.085 nmol.mg-1 proteins). 2. Great individual differences were noted. 3. The level of cytochrome increases with age in the immature (age less than or equal to 8.5 months) and young adults (age: 10-18 months). It is diminished in the older animals. 4. The measured average level is lower than that in other species, and approaches the human one. 5. The induction capacity of phenobarbital is lower in the cat than in other mammals, for example the rat or the mouse.

Aging↗
PubMed1979

[Effect of chronic hypercapnia on the gastric acid secretion in rats: a comparative study in vitro (author's transl)].

Rats are made hypercapnic by breathing 8% CO2 for a week. Their stomachs, removed under anaesthesia in a hypercarbic atmosphere, are placed in a special chamber and the acidic secretion (free + titratable) is measured in vitro in relation to different parameters of the controlled atmosphere. The secretion depends on the gas composition. Under the same conditions (mucosa CO2 = 8%, serosa CO2 = 10%) the in vitro secretion of the hypercapnic subjects (n = 32) is lower than that in the normal rats (n = 27), the latter secretion decreasing more rapidly with the duration of the in vitro measurement. The differences between the hypercapnic and the control subjects are in the order of +/- 10% in titratable acidity (mEq/l/h/cm2) and +/- 20% in free acidity (muEq/l/h/cm2).

Animals↗
PubMed1978

Blood effects of permanent normoxic hypercapnia in conventional rats.

Rats were exposed 24 hours a day to carbon dioxide, 8 +/- 1%, during 2 and 4 weeks under normoxic conditions (21% oxygen). On the last day, blood was taken from the abdominal aorta under anesthesia. Leukocyte and erythrocyte counts, hemoglobin concentration, and mean cell volume were electronically measured. Hematocit and Wintrobe indexes were calculated. Leukocyte differential counts and peroxidase activity were determined on blood smears. After 4 weeks of hypercapnia, a slight decrease of neutrophilic granulocytes was observed. In mature polymorphs, peroxidase activity (cytochemically demonstrated) simultaneously decreased. Erythrocyte counts and mean cell volume remained unchanged. The most important hematological disturbance was an hemoglobin concentration drop. Consequently, it was concluded that an hypochromic anemia characterized the permanent normoxic hypercapnia in rats.

Anemia, Hypochromic↗
PubMed1975

[Comparative morphometric data on the epiphysis, the subfornical organ, and the anterior pituitary gland in 2 groups of pure strain Wistar female rats, SPF or conventional].

In SPF female rats, the pineal gland is less voluminous and its cell-nuclei are smaller than those of conventionnal female rats. This confirms (with the voluminous adrenals previously reported) the stressing action of the absence of pathogenic germs on these animals. The anterior lobe of the hypophysis is slightly smaller and subfornical organ a little larger than in conventionnal female rats.

Animals↗
PubMed1975

[The rat ventricular myocardium in chronic hypercapnia. Electron microscopic study].

An electron microscope study of the left ventricular myocardium from rat acclimatized to chronic hypercapnia was done in order to complete the preceding work concerning general effects of respiratory acidosis. After 15 and 30 days of the acclimatation to 8% CO2 no lesions of the myocardium could be found. The results of the morphometric analysis indicated, however, discrete modifications of heart ultrastructure similar to those found before in hypoxic and failing hearts: namely a decrease of mitochondrial mean diameter and a non significant decrease of mitochondrial fractional volume. The latter was accompanied by a significant decrease of myofibrillar mass. The presence of cellular oedema seems to be suggested by an increase of fractional volume of the cytosol. The mechanism of these changes is not easy to explain. Further work will be necessary to make a choice between two possibilities: (1) depressed contractility related to some direct effect of high pCO2 and (2) tissue hypoxia secondary to local effects of the former.

Animals↗
PubMed1975

[Oxygen toxicity for pulmonary parenchyma. Ultrastructural study by electron microscopy. Physiopathologic data].

The lungs of rats submitted to 24, 36, 48 and 72 hours of pure normobaric oxygen were examined by means of the scanning microscope. The images obtained give a dynamic aspect of the changes in the lesions with two distinct phases: a phase of reactivity at 48 hours, marked by the development of hyperactivity of the granular pneumocytes, a phase of destruction characterised by considerable changes in the alveolar epithelium and filling in of the alveolar lumen with various debris. From these morphological findings, different physio-pathological factors are discussed: the role of the increase in PaO2, the protection provided by the increase in the gradient (A - a) DO2, cerebral and adrenal medullary involvement especially in hypoxemic subjects.

Animals↗