23 results match your criteria: "Constantine 1 University[Affiliation]"

Article Synopsis
  • The study investigates the properties and passivation of methylammonium lead triiodide (MAPbI) used in perovskite solar cells, finding a tetragonal crystal structure with a slight excess of PbI at grain boundaries.
  • Optical tests show MAPbI has a band gap of 1.53 eV, suggesting its effectiveness as a visible light absorber for solar energy applications.
  • Simulations predict a maximum power conversion efficiency (PCE) of 26.03% for optimized solar cell designs, highlighting the importance of various parameters like resistance and device structure in improving efficiency.
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Bioinformatics Analysis and Spatiotemporal Distribution of the fliC Gene and Its Protein Isolated from Escherichia coli-Infected Patients in Eastern Algeria.

Malays J Med Sci

October 2024

Department of Applied Biology, Faculty of Nature and Life Sciences, Laboratory of Microbiology Engineering and Applications, Frère Mentouri Constantine 1 University, Ain El-Bey, Algeria.

Background: The locus in primarily encodes flagellar (H) antigens. Exploring sequence diversity will shed light on the mechanisms of bacterial pathogenicity. This study examined the presence of mutant strains of in infected patients from different age groups, sexes and sample types in eastern Algerian provinces over a span of 2 years.

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Optimal third-order sliding mode controller for dual star induction motor based on grey wolf optimization algorithm.

Heliyon

June 2024

Laboratory of Electrical Engineering of Guelma (LGEG), Department of Electrotechnical and Automatic Engineering, Université 8 Mai 1945, Guelma, 24000, Algeria.

This paper introduces a novel approach for controlling a dual-star induction motor by combining third-order sliding mode control with the grey wolf optimization algorithm (TOSMC-GWO). The primary objective is to enhance motor performance by minimizing overshoot, rise time, settling time, overall response time, and steady-state error, while simultaneously mitigating unwanted oscillations in stator currents, rotor flux, and electromagnetic torque. Specifically, the proposed controller addresses the limitations of the indirect field-oriented control (IFOC) technique when using a classic sliding mode controller (IFOC-SMC).

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A completely green protocol was developed for the synthesis of a series of arylaminonaphthol derivatives in the presence of N-ethylethanolamine (NEEA) as a catalyst under ultrasonic irradiation and solventless conditions. The major assets of this methodology were the use of non-toxic organic medium, available catalyst, mild reaction condition, and good to excellent yield of desired products. All of the synthesized products were screened for their in vitro antioxidant activity using DPPH, ABTS, and Ferric-phenanthroline assays and it was found that most of them are potent antioxidant agents.

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Stabilization of Chromium Waste by Solidification into Cement Composites.

Materials (Basel)

September 2023

Department of Materials Engineering and Construction Processes, Wroclaw University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland.

This article deals with the study of hazardous chromium leaching, stabilized/solidified by cement CEM II after 28 days of curing, in an acidic environment. The mortars subjected to this study were investigated by X-ray diffraction (XRD) characterization to evaluate the influence of chromium waste on their mineralogical structure. In the study range (0.

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Recognizing, assessing, and responding to threats is critical for survival in the wild. Birds, especially in their role as parents, must decide whether to flee or delay flight when threatened. This study examines how age, reproductive stage, and the presence of a mate influence flight initiation distance (FID) and nest recess duration in white storks.

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Waste valorization as low-cost media engineering for auxin production from the newly isolated Streptomyces rubrogriseus AW22: Model development.

Chemosphere

June 2023

Laboratory of Mycology, Biotechnology and Microbial Activity (LaMyBAM), Department of Applied Biology, Constantine 1 University, BP, 325, Aïn El Bey, Constantine, 25017, Algeria.

Indole-3-acetic acid (IAA) represents a crucial phytohormone regulating specific tropic responses in plants and functions as a chemical signal between plant hosts and their symbionts. The Actinobacteria strain of AW22 with high IAA production ability was isolated in Algeria for the first time and was characterized as Streptomyces rubrogriseus through chemotaxonomic analysis and 16 S rDNA sequence alignment. The suitable medium for a maximum IAA yield was engineered in vitro and in silico using machine learning-assisted modeling.

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Process Optimization of Phytoantioxidant and Photoprotective Compounds from Carob Pods ( L.) Using Ultrasonic Assisted Extraction Method.

Molecules

December 2022

Department of Food Technology and Human Nutrition, Faculty of Veterinary Sciences, Regional Campus of International Excellence "Campus Mare Nostrum", University of Murcia, 30071 Murcia, Spain.

The current study first describes the extraction of phytoantioxidant polyphenols from Carob byproducts (pods) using maceration and heating-assisted extraction as traditional methods and ultrasonic-assisted extraction (UAE) as an innovative method to determine the most efficient extraction process in terms of four targeted responses: total phenolic content (TPC), antioxidant activities (TAC and DPPH), and photoprotective properties as measured by the sun protection factor (SPF). Second, we used response surface methodology (RSM) with a central composite rotatable design (CCDR) approach to investigate the influence of process variables (extraction time, extraction temperature, and solvent concentration) on UAE, which was found to be the most effective extraction technique in our study. Carob byproduct extracts had a TPC ranging from 6.

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Identification of cultivable bacterial strains producing biosurfactants/bioemulsifiers isolated from an Algerian oil refinery.

Arch Microbiol

September 2022

Laboratory of Molecular and Cellular Biology, Department of Microbiology, Faculty of Nature and Life Sciences, Mentouri Brothers Constantine 1 University, Constantine, Algeria.

Algerian petrochemical industrial areas are usually running spills and leakages of hydrocarbons, which constitutes a major source of toxic compounds in soil such as aromatic hydrocarbons. In this paper, samples of crude oil-polluted soil were collected from Skikda's oil refinery and were subjected to mono and polyaromatic hydrocarbons threshold assessment. Soil physicochemical parameters were determined for each sample to examine their response to pollution.

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Impact of Two Strains of on the Adaptation to Terminal Water Deficit of Two Cultivars .

Plants (Basel)

February 2022

Genetic, Biochemistry and Plant Biotechnology Laboratory, Faculty of Natural Sciences, Constantine 1 University, Route Ain El Bey, Constantine 25000, Algeria.

Drought stress has become one of the most uncontrolled and unpredictable constraints on crop production. The purpose of this study was to evaluate the impacts of two different strains on terminal drought tolerance induction in two faba bean genotypes cultivated in Algeria, Aquadulce and Maltais. To this end, we measured physiological parameters-osmoprotectants accumulation, oxidative stress markers and enzyme activities-to assess the effect of inoculation on under terminal water deficiency conditions in greenhouse trials.

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Identification and incidence of hard tick species during summer season 2019 in Jijel Province (northeastern Algeria).

J Parasit Dis

March 2021

Arthropods Biosystematics and Ecology Laboratory, Department of Animal Biology, Frères Mentouri - Constantine 1 University, Constantine, Algeria.

Ticks are haematophagous arthropodsand tick-borne diseases causes billions of dollars in losses in the cattle industry because of the ability of ticks to be vector for many pathogens. This paper identifies and compares the infestation rate (prevalence and intensity) of females of hard tick species compared to males with respect to sex, age and breed of cattle in the region of Jijel, northeastern Algeria. A total of infested 53 cattle were screened and 1214 ticks were collected manually during summer 2019 (June, July and August) and identified based on their morphology.

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The current study investigates the 2D entropy production and the mixed convection inside a wavy-walled chamber containing a rotating cylinder and a heat source. The heat source of finite-length is placed in the middle of the left vertical surface in which its temperature is fixed at T h . The temperature of the right vertical surface, however, is maintained at lower temperature T c .

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This study investigates thermal natural convective heat transfer in a nanofluid filled-non-Darcian porous and wavy-walled domain under the local thermal non-equilibrium condition. The considered cavity has corrugated and cold vertical walls and insulated horizontal walls except the heated part positioned at the bottom wall. The transport equations in their non-dimensional model are numerically solved based on the Galerkin finite-element discretization technique.

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Phenolic extracts of aerial parts of Genista ferox have been characterized and evaluated for their pharmacological properties which are still not reported. The total phenol and flavonoid contents in the extracts were estimated spectrophotometrically via the Folin-Ciocalteu and aluminium chloride methods, respectively. Leaves and pods extracts showed the highest contents of total phenols and total flavonoids.

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Introduction: Triple-negative breast cancer (TNBC) is characterized by the lack of estrogen receptor, progesterone receptor and human epidermal growth factor receptor-2 (HER-2) expression. It is aggressive and most common in African women. In this study we identified the frequency, clinical an pathological characteristics of this type in a cohort of women in Eastern Algeria.

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Introduction: Iron is an essential micronutrient in the growing fetus.

Objective: The purpose of this study is to find the possible correlations that may exist between maternal and fetal iron status and newborn weight.

Material And Methods: The study included 97 mothers scheduled to give birth by elective caesarean section in the central maternity of Tébessa (east of Algeria) between January and August 2014.

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It is a common view that assemblages of parasitic nematodes are influenced by climatic conditions; however, there are only a few articles available regarding those that infect farm animals. We investigated the relationship between climate variables and infection with abomasal trichostrongyles in 335 1-year-old rams grazed on steppe pastures in Eastern Algeria. Abomasa were collected from 12 local slaughterhouses located in four climatic areas (from humid to arid) and the worms extracted, identified and counted.

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Background: Bilateral adrenalectomy has been shown to damage the hippocampal neurons. Although the effects of long-term adrenalectomy have been studied extensively there are few publications on the effects of short-term adrenalectomy. In the present study we aimed to investigate the effects of short-term bilateral adrenalectomy on the levels of pro-inflammatory cytokines IL-1β, IL-6 and TNF-α; the response of microglia and astrocytes to neuronal cell death as well as oxidative stress markers GSH, SOD and MDA over the course of time (4 h, 24 h, 3 days, 1 week and 2 weeks) in the hippocampus of Wistar rats.

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Article Synopsis
  • The study focuses on the purification and biochemical characterization of XYN35, a thermostable xylanase enzyme from a newly identified thermophilic strain, Caldicoprobacter algeriensis, isolated from a hot spring in Algeria.
  • XYN35 demonstrated peak activity after 24 hours at 70 °C, with a maximum enzyme activity of 250 U/mL, and was successfully purified using heat treatment and chromatography techniques.
  • The enzyme operates optimally at pH 11 and 70 °C, is activated by certain metal ions, and shows potential applications in the pulp bleaching industry due to its effective breakdown of xylan into xylose and related products.
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In the title compound, C15H22O2, both five-membered rings display an envelope conformation whereas the six-membered ring displays a chair conformation. In the crystal, pairs of O-H⋯O hydrogen bonds between carb-oxy-lic groups link mol-ecules, related by a twofold rotation axis, into supra-molecular dimers.

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Crystal structure of pseudoguainolide.

Acta Crystallogr E Crystallogr Commun

March 2015

School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, Wales.

The lactone ring in the title mol-ecule, C15H22O3 (systematic name: 3,4a,8-tri-methyl-dodeca-hydro-azuleno[6,5-b]furan-2,5-dione), assumes an envelope conformation with the methine C atom adjacent to the the methine C atom carrying the methyl substituent being the flap atom. The other five-membered ring adopts a twisted conformation with the twist being about the methine-methyl-ene C-C bond. The seven-membered ring is based on a twisted boat conformation.

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Delayed γ-ray cascades, originating from the decay of (6⁺) isomeric states, in the very neutron-rich, semimagic isotopes (136,138)Sn have been observed following the projectile fission of a ²³⁸U beam at RIBF, RIKEN. The wave functions of these isomeric states are proposed to be predominantly a fully aligned pair of f(7/2) neutrons. Shell-model calculations, performed using a realistic effective interaction, reproduce well the energies of the excited states of these nuclei and the measured transition rates, with the exception of the B(E2;6⁺→4⁺) rate of ¹³⁶Sn, which deviates from a simple seniority scheme.

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A marked difference in the nuclear charge radius was observed between the I^{π}=3^{+} ground state and the I^{π}=0^{+} isomer of ^{38}K and is qualitatively explained using an intuitive picture of proton-neutron pairing. In a high-precision measurement of the isomer shift using bunched-beam collinear laser spectroscopy at CERN-ISOLDE, a change in the mean-square charge radius of ⟨r_{c}^{2}⟩(^{38}K^{m})-⟨r_{c}^{2}⟩(^{38}K^{g})=0.100(6)  fm^{2} was obtained.

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