[Effect of green alga Ulva lactuca polysaccharides supplementation on blood pressure and on atherogenic risk factors, in rats fed a high fat diet]. / Effet de la supplémentation des polysaccharides de l'algue verte Ulva lactuca sur la pression artérielle et sur les facteurs du risque athérogène, chez des rats consommant un régime riche en lipides.

AIM OF THE STUDY: To highlight the benefits of green alga Ulva lactuca polysaccharides supplementation on blood pressure and atherogenic risk factors in rats fed a high fat diet. METHODS: Wistar male rats were fed a high fat diet (30% sheep fat) for 3 months. At an average body weight (BW) of 360g, the rats (n=18) were divided into 3 groups and consumed, for 28 days, either a high fat diet (HFD) or a high fat diet enriched with 1% of whole green algae (WGA) powder or with 1% of its polysaccharides (PLS). RESULTS: In HFD, WGA and PLS supplementation reduced BW and food intake. WGA and PLS compared to HFD reduced systolic (PAS) (-17% and -19%) and diastolic (PAD) blood pressure (-38% and -39%), serum glucose (-37% and -30%, respectively), insulinemia (-55% and -74%, respectively), serum and hepatic total lipids, triglycerides, total cholesterol levels, as well as the total cholesterol concentration of low and very low density lipoproteins. The same, atherogenicity ratios and membrane fluidity decreased in the WGA and PLS vs HFD while lecithin: cholesterol acyltransferase (LCAT) activity increased (51 and 41% respectively). CONCLUSION: Ulva lactuca and its polysaccharides, one of the bioactive compounds of this macroalga, seem to have hypotensive, hypoglycemic, hypolipaemic and antiatherogenic properties that can correct or prevent certain cardiovascular complications linked to a high fat diet.

[Sardine purified proteins improve blood pressure, glycemic control, anti-atherogenic metabolic pathways and antioxidant capacity in obese rats]. / Les protéines purifiées à partir de sardines améliorent les chiffres tensionnels, l'équilibre glycémique, les voies métaboliques anti-athérogènes et la capacité anti-oxydante, chez le rat obèse.

AIM OF THE STUDY: The effects of sardine by-products (SBy-P) and fillet proteins (SF-P) were compared to casein (Cas) ; these effects were assessed on blood pressure, glycemic control, reverse cholesterol transport, lipid peroxidation and total antioxidant capacity in obese rats. MATERIALS AND METHODS: Eighteen male Wistar rats were subjected for three months, to a high-fat diet. The obese rats were divided into three groups and consumed the same high-fat diet for 28 days after addition of either, 20% SBy-P, SF-P or Cas. RESULTS: The sardine proteins (SBy-P and SF-P) compared respectively to Cas, reduced diastolic (-14%, -11% P<0.05) and systolic pressures (-12%, -8% P<0.05), blood glucose (-24%, -21% P<0.05), glycated hemoglobin (-28%, -21% P<0.05), insulinemia (-29%, -18% P<0.05) and HOMA-IR index (-29%, -18% P<0.05). They improve the reverse cholesterol transport by increasing the lecithin: cholesterol acyltransferase (LCAT) activity (+43%, +30% P<0.05) and high-density lipoproteins in cholesterol esters (+108%, +88% P<0.05), and decreasing the atherogenicity ratios and membrane fluidity (P<0.05). Furthermore, SBy-P and SF-P induced a reduction of reactive thiobarbituric acid substances concentrations in heart (-45%, -25% P<0.05), aorta (-62%, -41% P<0.05), liver (-40%, -21% P<0.05) and adipose tissue (-50%, -37% P<0.05) with an improvement in antioxidant capacity. CONCLUSION: Sardine proteins, in particular those extracted from by-products, because of their hypotensive, hypoglycemic, anti-atherogenic and antioxidant properties, may have protective effects against the cardiovascular risk associated with obesity.

Isolation and characterization of different bacterial strains for bioremediation of n-alkanes and polycyclic aromatic hydrocarbons.

Crude oil is a common environmental pollutant composed of a large number of both aromatic and aliphatic hydrocarbons. Biodegradation is carried out by microbial communities that are important in determining the fate of pollutants in the environment. The intrinsic biodegradability of the hydrocarbons and the distribution in the environment of competent degrading microorganisms are crucial information for the implementation of bioremediation processes. In the present study, the biodegradation capacities of various bacteria toward aliphatic and aromatic hydrocarbons were determined. The purpose of the study was to isolate and characterize hydrocarbon-degrading bacteria from contaminated soil of a refinery in Arzew, Algeria. A collection of 150 bacterial strains was obtained; the bacterial isolates were identified by 16S rRNA gene sequencing and their ability to degrade hydrocarbon compounds characterized. The isolated strains were mainly affiliated to the Gamma-Proteobacteria class. Among them, Pseudomonas spp. had the ability to metabolize high molecular weight hydrocarbon compounds such as pristane (C19) at 35.11 % by strain LGM22 and benzo[a] pyrene (C20) at 33.93 % by strain LGM11. Some strains were able to grow on all the hydrocarbons tested including octadecane, squalene, phenanthrene, and pyrene. Some strains were specialized degrading only few substrates. In contrast, the strain LGM2 designated as Pseudomonas sp. was found able to degrade both linear and branched alkanes as well as low and high poly-aromatic hydrocarbons (PAHs). The alkB gene involved in alkane degradation was detected in LGM2 and other Pseudomonas-related isolates. The capabilities of the isolated bacterial strains to degrade alkanes and PAHs should be of great practical significance in bioremediation of oil-contaminated environments.

[Impact of physical activity on the autonomy and the quality of life of patients with spinal cord injury]. / Impact de la pratique sportive sur l'autonomie et la qualité de vie du paraplégique.

OBJECTIVE: To assess the effect of regular physical activity on the autonomy and the quality of life of Tunisian patients with spinal cord injury. METHODS: The study relates to 25 paraplegic divided into two groups: 10 paraplegic sportsmen and 15 sedentary paraplegics among whom we assess the degree of the autonomy with the Functional Independence Measure and the quality of life with the quality of life questionnaire SF36 in its Arabic version. RESULTS: The result analysis shows a significant difference of the total score of the Functional Independence Measure between the two groups, the sporting paraplegic having developed a better autonomy on the daily activities than the nonsporting paraplegics with a total average score of 115.10 against 93.87 (p<0.001). A significant difference is noted, mainly in the headings "personal care" and ',"mobility". Concerning the shutter "quality of life", the scores of various dimensions of scale SF36 were higher in the sporting paraplegic with significant difference in the headings bodily pain (p<0.01), vitality (p<0.04) and global physical score (p<0.008). CONCLUSION: This study enabled us to show that the regular physical activity as well had a positive effect on optimization of the functional capacities of paraplegic as on the improvement of its quality of life, thus, supporting a better socioprofessional reintegration.