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Biomedical subjects

R C de Angelis

Publications and source records attributed to R C de Angelis.

14 recordsLinked to original sources
PubMed1996

Dietary nitrite and scavenger antioxidants trace elements.

Rats initially weighing 138 +/- 14 g were fed the following diets for 150 days: control (Co), control plus nitrite-bacon-proline 24 mg/kg, 100 g/kg and 10 mg/kg, respectively (NB), NB plus 0.04 micrograms/g selenium (NBSe) and NB plus 0.020 g/kg ascorbic acid (NBC). The NB diet provoked body weight and feeding efficiency enhancement with a reduction in body density increasing serum lactic acid, uric acid and cholesterol levels. The serum selenium decreased by the presence of NB in the diet. The addition of selenium and ascorbic acid to the NB diet prevented the reduction in body density and also affected uric acid and cholesterol levels. It is suggested that the NB diet has adverse effects and that some of the alterations it causes are prevented by the reducing elements selenium and ascorbic acid.

Animals↗
PubMed1995

Effects of dietary fat and nitrite on plasma and corporal density.

Two groups of nine weanling male rats each were fed different diets for 60 days. Group A (control) was fed a full casein diet containing 17% protein. The group B received the same diet plus nitrite, fried bacon and proline. Diet B induced increased body weight gain and increased plasma l-lactic acid and cholesterol levels, as well as a decrease in plasma selenium. We suggest that the adverse effects of diet B are related to peroxidation, with an increased nutritional need for selenium.

Animals↗
PubMed1987

Rice and beans--effect of milk, mineral, and vitamin A, on weight gain, food intake, and body protein retention.

Weanling rats were fed on diets of rice/beans (RB) with or without mineral (M) supplement; vitamin A (A); M + A (MA); or milk (L), containing from 3 to 14% protein. As determined by various measures, the best results were observed in the group fed the RB diet, supplemented with L. This group was followed by those receiving the MA and M diets. Protein utilization in the RB diet, as well as minimum protein requirement for maintaining body weight, depend on the supplementary nutrients. The mechanism of this effect may be related to the appetite of the animals and to the voluntary intake, which is influenced and regulated by the diet composition.

Animals↗
PubMed1983

Corn amino acid imbalance and the role of leucine excess.

A study was conducted using two experimental models with weanling rats of the Wistar strain fed isocaloric diets containing 7% protein, Model I: two genetic varieties of maize were used; common corn (CC) or opaque-2-corn (M); and Model II: casein, 7% protein used without nicotinic acid in the diet in order to enhance the tryptophan limiting conditions like in the CC diet of Model I. PER, nitrogen balance, urinary urea and hepatic fat were determined. The results suggest that the imbalance of CC protein is related to lysine and tryptophan limitation, although the leucine excess content also plays an important role.

Amino Acids↗
PubMed1981

[Sensitivity of different biological methods for differentiating the protein value of various foods].

The nutritive value of proteins from different sources was studied. The value for PER, weight of the animals, IEC, NPR, NDpCal%, digestibility (D), and biological value (BV) was determined with diets containing 7% of total protein. The best results were obtained for milk, opaque-2 corn, rice and soybeans. The association of rice + soybeans was optimum. The results suggest also that it is advantageous to supplement wheat with cassava. Comparison of the results obtained by the different biological methods, classified by sensitivity for different protein qualities, revealed that the best methods are weight gain, PER and IEC better than NPR and NDpCal%, which in turn were better than BV, food intake and D (P less than 0.01).

Animals↗
PubMedDate not supplied

Enhancement of sodium intestinal secretion in relation to absorption in malnourished rats. Hyperosmolar challenge.

Two experimental models were tried in young malnourished rats in order to study effect of an hyperosmolar challenge in the small intestine on the bi-directional fluxes of sodium. Weanling rats were fed with energy restricted diets. In model I 1 mL of NaCl 900 mOsm/kg was introduced in the small intestine of the rats and left from 5 up to 70 min, in order to determine the moment of higher net Na+ secretion, which occurred at 10 min. In model II, the bi-directional fluxes of Na+ and Cl- were studied using NaCl or mannitol 900 mOsm/kg under the effect of mecholil, atropine or 2-4 dinitrophenol, for 10 min. Mecholil decreased the Na+ absorption enhancing the net secretion. Control rats were used as reference. In the restricted diets animals occurred an increase of the net secretion stimulated by NaCl 900 mOsm/kg, and this effect was enhanced by mecholil. It is suggested that in malnutrition there is an impairment in Na- intestinal absorption.

Animals↗
PubMedDate not supplied

[New concepts in nutrition: considerations on the connection diet-health].

The physiological effects of several foods are discussed as possible factors reducing the risk of degenerative diseases as cardiovascular and some cancers. The new emmerging concept of functional foods is presented with examples as the phytoestrogens of soya beans. The importance of consuming olive oil is emphatic, but with criticism to the lost of physiological bioactive material during the normal extractions of the olive oil and the refinement. So, much attention is needed. The way to obtain much of these bioactive protectors foods is summarized.

Cardiovascular Diseases↗
PubMedDate not supplied

Imbalanced protein and appetite.

Free amino acid concentration in the plasma of rats fed on different diets were compared. The diets contained 7 g protein/100 g furnished by: casein, or common corn, or opaque 2 corn, or eggalbumin, or gelatin. A protein free diet was also included. The results showed that imbalance of the protein diet influenced the appetite; whenever the NE/E aminoacid ratio increased, body development, appetite and plasma albumin decreased. An inverse correlation between the NE/E of free aminoacids of the plasma and voluntary intake was observed. The results also show that the plasma aminogram did not reflect the composition of the protein in the diet. The results obtained are discussed.

Animals↗
PubMedDate not supplied

Bio-utilization of protein, calcium and zinc from diets based on rice and beans, in human beings.

Nine male healthy adults volunteers of average body weight 69.51 +/- 11.59 kg were submitted to 3 experimental diets: I complete diet, containing rice and beans (RB): II--low protein, low calcium: III--vegetable diet containing RB. The diets were consumed "ad libitum". The total energy intake in each dietary period were: 46.04 +/- 9.18; 37.57 +/- 9.04; 55.27 +/- 7.18 respectively. The average free choice for the proportion of rice/beans was 1.22 and 1.35 in the periods I and III. The protein balance was positive only for the diet I and the balance of calcium was positive in diets I and II. Zinc didn't attained positive balance neither in diet I. It is suggested that the presence of beans in diets I and III plays an important role in decreasing the bio-utilization of the studied nutrients.

Adult↗
PubMedDate not supplied

[Digestibility and protein efficiency of a mixture of rice and beans].

In spite of considerable work in the area of protein quality, consideration should be given in the monitoring of methodologies. In the present investigation the author studied (in rast) digestibility (D) versus score (s) of the mixture of rice and beans or casein diets, containing different protein levels. The parameter "DS" overestimated the value of protein in relation to other methods. Milk diet at 10% of protein was efficient in all nutritional situations.

Animals↗