In this study, the total phenolic levels, antioxidant and antibacterial activities of Claladods from Opuntia ficus indica extracts originating from Saida in Algeria were determined. The phenolic components of these extracts were also determined using HPLC. Total phenolic levels ranged from 10.75 to 1.80 mg g EC/mg E; the total flavonoid components of the extract ranged from 7.99 to 1.31 g EC/mg E. Antioxidant activity of the aqueous extract was increased according to FRAPP, CE50 scored 750 2.1 (g/ml) and free radical DPPH antiradicular activity was scored CI50 (18724.3 g/ml). The phenolic compounds identified by HPLC were acid cinapine ascorbic acid nicotamide tannic acid caffein vanillin kaempherol quercetin myirecetinepicatechin/catechin and five unknown compounds. All of the plants studied contain kaempherol (41%), epicatechin/catechin (14.5%), quercetin (12.9%), myrecetin (8, 9%), Vaniline (7.8%), Ascorbic Acid (3.1%), Nicotamide (2.7%), Tannic Acid (0.4%), Caffeine (0.1%), Cinapic Acid (0.1 %). the aqueous extract has significant antioxidant activities in vitro, the results indicated that the OFI could be attributed to a potential source of natural antioxidant for food applications, The antibacterial activity of Opuntia ficus were estimated towards multiple types of bacteria (Escherichia coli, Pseudomonas aeruginosa, Enterococcus faecalis, Staphylococcus aureus, and Bacillus Subtilis). The plant shows high activity against all types of bacteria. The obtained results of the antibacterial application inhibitors seem to be quite promising material in the antibacterial fields.

Anvillea radiata is used in traditional medicine for the treatment of chest colds, indigestion, and gastrointestinal disorders. Our plant has hypoglycaemic, antitumor, anti-inflammatory, and antibacterial activity and is used for the treatment of dysentery.We have investigated the analgesic and anti-inflammatory activity of the aqueous extract of Anvillea radiata. In analgesic activity, we have used mice of the strain NMRI Albinos, weighing between 26 and 38 g (in vivo study). Acetic acid was used to induce writhes in mice, and the evaluation of the analgesic activity shows that the aqueous extract at 150 mg/kg of our plant induces a decrease in the number of abdominal cramps caused by 1% acetic acid. The aqueous extract of our plant has an analgesic effect almost equal to that of Diclofenac; in fact, the latter causes a pain inhibition of 30.28 1.1% and that of Anvillea radiata of 28.71 2.1% for a concentration of 150 mg/ kg. Our results of this research indicated that Anvillea radiata inhibited inflammation, which could explain its use in traditional medicine.

Algeria is facing an endemic drought spread over 40 years and the lack of rainfall makes us fear the worst for the country's water security. The variability in the amount of rainfall and its irregularities in time and space are the main causes of the behavior of a climatic regime.This work focuses on the analysis of climatic data provided by the google earth engine platform in order to detect temporal changes in the hydrometeorological series.The climatic results of our Mekerra watershed show a very irregular hydrometeorological system, a long dry season, an LST that reaches 54 C°, an average annual rainfall amount is 390.41 mm and a rainfall deficit estimated at 30%, a very low rainfall deficit of a maximum value of 0.42 and an NDWI globally negative.

This study aims to determine the chemical composition and evaluate the antibacterial activity of the essential oil of leaves dry lavender (Lavandula officinalis). The analysis of the essential oil indicates the presence of terpenes, tannins, saponins, flavonoids, alkaloid, coumarins, and the absence of anthocyanins. Furthermore, of the oil's antimicrobial activity was evaluated using agar diffusion and broth microdilution methods. The antimicrobial test results showed that the oil had antimicrobial activity against all 8 microorganisms strains included in the study. Results suggest antimicrobial properties of the Lavandula officinalis essential oil, which may find its application in future research for the pharmaceutical industry.

Brucellosis is an anthropozoonosis caused by a bacterium of the genus brucella. The aim of this study was to study the seroprevalence of brucellosis in high risk individuals. The Wright technique was used (Reagent: Brucella abortus, Antigen: Somatic, Reference: 1205091). Our study focused on the population of the southern region of Sidi-Bel-Abbès and showing clinical signs of brucellosis between February 2010 and June 2012 and whose "Wright" test was positive. 111 cases of human brucellosis have been identified; 59.45% male against 40.54% female. 50.45% reported no contact with animals, however contact with goats, cattle and sheep was 13.51%, 6.30% and 0.90%, respectively. Regarding the consumption of raw milk it was of the order of 53.15% against 17.11% for curd and 0.90% for under cooked meat. The 30-40 age group was the most common. The results on the follow-up of a previous treatment indicate that 2.70% followed a previous treatment against 97.29% that they had no treatment to follow. Brucellosis is an infection that is evolving in our region (Sidi-Bel-Abbès) it requires more monitoring.

Our work consists in characterizing the phytoplanktonic biodiversity of lake Sidi Mhamed Benali, also, biotic parameters were employed to assess lake trophic conditions, by Multivariate Analysis and by the ecological indices, during the period which extends from March to May 2021.The results of the phytoplankton analysis allowed us to list 89 species divided into 6 classes (Diatoms, Chlorophyceae, Euglenophyceae, Cyanophyceae, Cryptophyceae and Dinophyceae).The general composition of the phytoplankton of the lake is dominated by Diatoms with 34 taxa, or 36.62% of the phytoplankton community, represented mainly by the following genera: Cyclotella, Nitzschia and Fragilaria, followed respectively by Chlorophyceae with 25 taxa, or 31.81% of the total population, they are represented mainly by Oocystis, Tetraspora and Closterium, Eugenophyceae with 13 taxa, a proportion of 12. 82%, the Cryptophyceae: groups 5 taxa, with a proportion of 10.44%, the Cyanophyceae: counts 9 taxa, with a proportion of 6.88%, the Dinophyceae which groups 3 taxa, with a proportion of 1.42%. Moreover, the waters of the lake are classified as waters of average quality and are in as hypereutrophic state.

Plant species of medicinal interest are involved in various sectors in their raw state or in the form of oils, extracts, aqueous or organic solutions. Their preparations contain one or more active ingredients that can be used for therapeutic purposes. Medicinal plants are recognized for physicochemical properties and richness in natural drugs belonging to different molecule classes such as terpenoids and phenolic compounds, like flavonoids, tannins, coumarins and phenolic acids that contribute to effective protection against numerous pathological processes. This study was devoted to phytochemical screening and evaluation of biological properties, namely, the antioxidant activities of hydroethanolic and infusion extracts prepared from Algerian Sahara Nerium oleander. Phytochemical tests applied to the studied plant showed the presence of several families of chemical compounds, including tannins and flavonoids. All samples exhibited interesting antioxidant activity when compared to the standard Trolox, but the hydroethanolic extract (EC50 values between 18 and 75 µg/mL) presented the highest bioactivity. The contemporary presence of bioactivities suggests that the Saharan Nerium oleander may be a source for such new preservatives in the food and pharmaceutical industries.

Brucellosis is an anthropozoonosis caused by a bacterium of the genus brucella. The aim of this study was to study the seroprevalence of brucellosis in high risk individuals.Our study focused on the population of the southern region of Sidi-Bel-Abbès and showing clinical signs of brucellosis between February 2010 and June 2012 and whose "Wright" test was positive. 111 cases of human brucellosis have been identified; 59.45% male against 40.54% female. 50.45% reported no contact with animals, however contact with goats, cattle and sheep was 13.51%, 6.30% and 0.90%, respectively. Regarding the consumption of raw milk it was of the order of 53.15% against 17.11% for curd and 0.90% for undercooked meat. The 30-40 age group was the most common. The results on the follow-up of a previous treatment indi-cate that 2.70% followed a previous treatment against 97.29% that had no treatment to follow. The present study underscores the importance of Bru-cellosis as an infection that has evolving in our region (Sidi-Bel-Abbès) and requires more serious monitoring.