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Biomedical subjects

C Collombel

Publications and source records attributed to C Collombel.

At least 37 records · Page 2Linked to original sources
PubMed1986

[Tissue and blood ferritins and isoferritins].

Ferritins which can store excess iron are localised principally in tissue. Ferritins have on apoprotein shell which is composed of 24 sub-units, from 2 types of sub-units: "H" (molecular weight about 21 000) and "L" (molecular weight about 19 000) that assemble in different proportions and give multiple forms. Protein pattern depends on tissue nature. Since 1972, radio-immunology assays have shown very low serum ferritin levels. There is a good correlation between these levels and the amount of storage iron in the body. However it was demonstrated that elevation of serum ferritin could also occur without iron metabolism trouble by various mechanisms.

Chemical Phenomena↗
PubMed1985

On the choice of an organization for a pathology laboratory.

The study describes an approach to the optimal allocation of sample analysis in a pathology laboratory. The paper consists of three parts: identification of the problem to be resolved; description of the model and application of the model to the organization of a specific laboratory.

Blood Chemical Analysis↗
PubMed1985

Liquid-phase reactions started by rehydrating lyophilized reagents in a centrifugal analyzer.

In the disposable rotor of the SAM microcentrifugal analyzer, various lyophilized reagents are predistributed in 24 33-microL cuvets, for determination of multiple analytes in one specimen (e.g., for patient profiles). We evaluated a prototype of this system, which can be used at 25, 30, or 37 degrees C; absorbance readings at 340, 405, and 500 nm varied linearly up to 2.0 A. Starting the reactions by rehydrating the reagents with diluted serum is adequate because absorbance readings do not begin until 180 s after initiating the rehydration. Analytical performances of kinetic determinations at 30 degrees C showed good accuracy and correlation with other methods for creatine kinase, amylase, aspartate aminotransferase, and gamma-glutamyltransferase. Kinetic determinations for urea, and equilibrium determinations with blank corrections for glucose, cholesterol, and triglycerides gave excellent results for glucose and correct results for the other analytes. This compact analyzer combines the analytical performances of a centrifugal analyzer with the practicability of instruments having predistributed reagents.

Centrifugation↗
PubMed1983

Screening for neonatal Duchenne muscular dystrophy by bioluminescence measurement of creatine kinase in a blood sample spotted on paper.

Neonatal screening for Duchenne-type muscular dystrophy is greatly simplified by use of a new bioluminescence procedure for creatine kinase. The blood of newborn myopathic children consistently showed increased activity. The improved method permits the analysis from a dried sample of whole blood spotted on filter paper; it shows high correlation with existing procedures and is highly specific and precise. The use of the improved method in a screening program involving 158 000 newborns is reviewed. We find a prevalence of 1/5929 living eighth-day boys.

Adenosine Triphosphate↗
PubMed1975

[Determination of glomerular and tubular clearance in children without urine collection].

The determination of glomerular and tubular clearance in a child was carried out by using a method excluding urine collection, with a continuous intravenous infusion of polyfructosan and para-amino-hippuric acid. A loading injection followed by a continuous perfusion provides a constant plasmatic level 150 minutes after the beginning of the study.

Aminohippuric Acids↗
PubMed1975

[Study of the pathogenic mechanism of hypocalcemia in primary hypomagnesemia. Demonstration of a blockage of the mechanism of release of parathyroid hormone].

Parathyroid function and peripheral responsiveness to parathyroid hormone were studied during magnesium dependent hypocalcemia in a 5 years old boy with primary hypomagnesemia. The bone system and the kidneys were responsive to exogenous bovine parathyroid extracts as demonstrated by the normalisation of the calcemia and the increase of urinary cyclic AMP, phosphorus and hydroxyproline. Low levels of serum immunoreactive parathyroid hormone gave also clear indication of impaired parathyroid function. By contrast intravenous injection of magnesium sulfate induced an instantaneous and very sharp increase of serum immunoreactive parathyroid hormone as shown by levels well above the normal range one minute after the injection ; this was followed by a regular decrease of hormonal levels reaching the normal range one hour later. This finding clearly demonstrates that severe magnesium depletion induces impaired parathyroid hormone release in man.

Child, Preschool↗
PubMed1975

[A form of late propionic acidemia].

Report of 3 cases of propionic acidemia which concern one boy (O.M.) in whom a formed diagnosis of hyperglycemia with ketosis had been established, and two sisters (C.V. and K.V.) of another family. The activities of propionyl-CoA carboxylase in O.M. and C.V. fibroblasts were reduced to 4.5 and 2.5% of control. After two severe metabolic crisis, at 6 and 44 months of age, O.M. has at the present time (11yrs) a normal psychical development, and very few neurological disorders. Propionic acidemia was manifested only at 34 months of age in C.V. with a very severe crisis of acidoketosis with hypoglycemia, leading to neurological sequellae which are still important at 56 months of age. The disease was entirely latent in K.V. at 26 months, when the diagnosis was proven; it remains latent at 40 months. These case reports represent a special form of propionic acidemia with late clinical expression. Biological evolution does not seem to be affected by prolonged administration of biotine.

Acidosis↗