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The assessment of the physicochemical quality of water intended for irrigation of Oued Méskiana (Oum El Bouaghi) Algeria

Abstract

The aquatic ecosystem of the Meskiana Valley (wilaya of Oum El Bouaghi) covers a large area with a permanent flow and a semi-arid climate characterized by a strong evapotranspiration. In order to determine the Physico-chemical quality, pollution and salinity of the water of the river of Meskiana and more particularly in its downstream part which is exposed to wastewater discharges, analyses were carried out at the level of three sampling points: witness, the upstream (before spill), downstream (after spill)). In order to prevent the risk of alkalization and salinization of soil, the sodium absorption rate (SAR) and the percentage of sodium were determined and represented on the Wilcox and Riverside diagram. The high concentrations of polluting chemical elements and excessive salinity obtained at the downstream site show a high risk of pollution and salinization.

Open access
Biodiversity, Distribution and Ecology of Testate Amoebae (Arcellinida and Euglyphida) from the Bulgarian Black Sea Coast and the related brackish lakes. A Synthesis

Abstract

The studies on the marine and freshwater testate amoebae of the Bulgarian Black Sea littoral and some related coastal brackish lakes are briefly reviewed. So far, a total of 184 species and subspecies of testate amoebae from 18 families and 45 genera from orders of Arcellinida and Euglyphida were published in national and international journals. The underground waters of the Bulgarian marine sand supralittoral are better studied than the related continental lakes. A total of about 45 species of marine interstitial testate amoebae are known, so far, and a big part of them were for the first time described from the Black Sea littoral. It’s interesting to note the presence in the marine underground waters of the Black Sea littoral of many freshwater testate amoebae also, considered by us as eurybionts. That is due of the low and variable salinity of the littoral Black Sea waters during the year. The presence of some psammobiotic testate amoebae as Psammonobiotus lineare and Corythionella georgiana in some related brackish lakes is also of ecological interest. The general conclusion of the present synthesis is that the testate amoebae fauna of the Bulgarian Black Sea coast and the related with it many brackish and freshwater littoral lakes is few known yet and need more active researches.

Open access
Chemical Composition of the Essential Oil of Aerial Parts of Thymus ciliatus (Desf.)

Abstract

The essential oil of the aerial parts of Thymus ciliatus (Desf.) belonging to the Lamiaceae family, was obtained by steam distillation and analyzed by GC-FID and GC-MS. 75 components were identified corresponding to 95.57% of the total oil. The major constituents of the oil were: elemol (6.80%), carvacrol (5.86%), γ-muurolene (5.18%), β-sesquiphellandrene (5.09%), bicyclogermacrene (5.04%), β-pinene (4.49%) and curcumene (4.20%), together with other compounds at relatively low levels: 1,8-cineol (3.66%), β-eudesmol (2.92%), β-bisabolene (2.81%), β-silinene (2.75%), camphor (2.64%), germacrone (2.34%), α-zingiberene (2.12%), δ-cadinene (2.08%), caryophyllene oxide (1.90%), spathulenol (1.88%), □-caryophyllene (1.88%), ar-turmerone (1.79%), α-pinene (1.52%), limonene (1.52%), selina-4,11-diene (1.46%), curzerenone (1.41%), germacrone B (1.37%), bornyl acetate (1.31%), β-farnesene (1.28%), borneol (1.23%), myrtenal (1.16%), zingiberenol (1.15%) and sabinene (1.13%). These results differ from those of previous studies reported on this species collected from other regions of Algeria and Morocco.

Open access
Ethnobotanical study of Belezma National Park (BNP) plants in Batna: East of Algeria

Abstract

The present work focuses on an ethnobotanical study of medicinal plants in the Belezma National Park (BNP), which is located in Batna city. It was conducted to precise on the medicinal plants in the park and gathers all the information on the therapeutic practice used by the local inhabitants of the study area. Using 300 questionnaire cards, ethnobotanical surveys of BNP were conducted during two campaigns (2017 and 2018). The obtained results allowed us to identify 50 medicinal plants used by the population of the region, which are divided into 27 families and 46genus.

The obtained results show both leaves and stems are mostly used for diseases’ treatment in the form of a decoction with a rate of 42.34%. For the treated diseases, the digestive disorders occupy the first place with a rate of 34.01%, followed by uro-genital diseases with a rate of 17.56%, 11.20% for respiratory diseases, 11.84% for orthopedic diseases and 6.23% for cardiovascular.

The founded results could be a database for research on phytochemistry and pharmacology for the national medicinal flora and the population of the BNP region. Also, they constitute a very valuable source of information.

Open access
Green-extraction of essential oil of the species Ruta chalepensis L.: gas chromatography-mass spectroscopy-infra red analysis and response surface methodology optimization

Abstract

The objective of the present study was the optimization of the parameters affecting the hydrodistillation of Ruta chalepensis L. essential oil using response surface design type Box-Behnken. After an appropriate choice of three parameters, 15 experiments were performed leading to a mathematical second-degree model relating the response function (yield of essential oil) to parameters and allowing a good control of the extraction process. The realization of the experiments and data analysis was carried out by response surface methodology (RSM). A deduced second-order polynomial expression was used to determine the optimal conditions necessary to obtain a better essential oil yield. These optimized operating conditions were: a granulometry of 2 mm, a condensation-water flow rate of 3.4 mL/min and an extraction time of 204 min. Analysis of variance (ANOVA) indicates that the generated second-order polynomial model was highly significant with R2=0.9589 and P<0.006. The gas chromatography-mass spectrometry analysis of essential oil extracted from the Ruta chalepensis L. aerial parts revealed the presence of 2-undecanone, 2-nonanone and 2-decanone as major components.

Open access
Influence of biological removal of lactose on the physical and chemical parameters of crude sweet whey

Abstract

The crude sweet whey is an effluent and a co-product of cooked and pressed cheeses and casein, released into the environment without prior treatment (case of Cheese Dairy Sidi Saada, Yellel, Relizane, Algeria) affect the quality of freshwater ecosystems (Oued Mina, Relizane, Algeria).Our study focused on the control of the physical and chemical parameters of crude sweet whey and delactosed whey.The results showed that the applied bioprocess modified the physical and chemical parameters of crude sweet whey such as :density,dry matter,refractive index,viscosity,ash,pH and electrical conductivity, acidity,proteins and lactose; for this purpose these findings depended on the operating conditions, and the composition of the whey put in treatment.

Open access
Interpretation of the Miocene fossils in the Strymon basin in Northern Greece to determine their habitat

Abstract

The sedimentary sequences of the upper Miocene in the Strymon basin in Northern Greece are composed of sedimentary rocks and are separated on an entirely new lithostratigraphic shape. Fossil-fauna has been collected from specific parts of the described geological sections, which mainly include mollusks from Bivalvia and Gastropoda. From laboratory research on the micro-fauna and micro-flora a number of taxonomic units of Foraminifera were determined and representatives of Actinozoa, Bryozoa, Crinoidea, Ostracoda, Otolithus, Diatomeae and Charophyta were found, which give a more-complete biostratigraphical image of the sediments. Based on these investigations with the use of the biofacial analysis, through the study of palaeoecology data of the fossils, three basic types of palaeohabitat and development of organisms were identified and a new palaeogeographic interpretation of the depositional environments in the Miocene basin is given.

Open access
New record of Glomeris hexasticha Brandt, 1833 (Diplopoda: Glomerida: Glomeridae) from the Lilyaksko Plateau, North-Eastern Bulgaria

Abstract

The present article reports on the first record of Glomeris hexasticha Brandt, 1833 in the area of Lilyaksko Plateau in North-eastern Bulgaria. The species has been found in three of the researched habitats in the region: LP1 – deciduous forest of common hornbeam (C. betulus); in LP2 – coniferous forest of black pine (P. nigra) and in the located nearby Meadow 1 (LP4), covered with wild wheat grass and single shrubs of common rosehip (R. canina). The research of the Myriapoda fauna of the Lilyak Plateau was conducted from May 2017 to April 2018 and G. hexasticha was established only in the period May – August 2017, and a total of 55 individuals (17 males, 17 female) were collected. The largest number of individuals (24) were registered in June 2017 (17 in LP1, 2 in LP2, and 5 in LP4).

Open access
Phytochemistry, HPLC profile and antioxidant activity of aqueous extracts of fenugreek (Trigonella foenum graecum L.) seeds grown in arid zones of Algeria

Abstract

Fenugreek is an herb that has the ability to resist multiple environmental insults, pests, diseases and many pathogens through the synthesis of substances allowing this plant protection, these substances are called phytochemical compounds or secondary metabolites. The aim of this study is to characterize these secondary metabolites in the extracts of fenugreek seeds grown in Algeria and compare the phytochemical profile and antioxidant activity of the aqueous extracts obtained by maceration and decoction. We carried out a “phytochemical screening” on both types of extracts in order to highlight the different classes of secondary metabolites and assaying total polyphenols by the method of Follin ciocaltchu, total alkaloids and tannins contained in these aqueous extracts and appreciate their antioxidant activity using the FRAP technique. A characterization of phytochemical molecules of the two types of Fenugreek extracts was done by chromatographic method with HPLC. Several phytochemical groups were identified in the extracts of fenugreek: tannins, saponins, flavonoids, terpenes and reducing nitrogen compounds. Chromatographic analysis of the samples show that 4 phytochemical molecules were identified in the aqueous maceration extract: kaempferol, genistein, vanillin and myrecitine and 3 molecules for the aqueous extract of decoction are: rutin, kaempferol and vanillin. The aqueous extract of decoction was characterized by the total polyphenols content (31.7 ± 0.031 mg GAE / 100 g of extract), total alkaloids (2.12 ± 0.015%) and tannins (9.75 ± 0.06%) that are higher than those obtained in the aqueous extract of maceration: total polyphenols (18.9 ± 0.12 mg GAE / 100g of extract), total alkaloids (1.71 ± 0.02%) and 8.69 ± 0.02% for the tannins. A non-significant difference was marked for antioxidant activity found in both types of extracts (56.90 ± 0.013 mg AAE / 100g decoction extract against 56.37 ± 0.24 mg AAE / 100g maceration extract). In the end we conclude that fenugreek may be a promising plant genetic resource responsible for an important biological activity, except its nutritional and therapeutic properties due to their phytochemical compounds.

Open access