In the present investigation, novel photoluminescent and transparent biocomposite films based on chitosan reinforced with styrylbenzothiazolium-g-cellulose nanocrystal for anti-counterfeiting ...applications were successfully prepared by casting solvent. Three novel styrylbenzothiazolium derivatives were synthesized by Knoevenagel condensation and characterized by FTIR, 1H, 13C NMR and photoluminescence analysis. These photochromic compounds have been used to functionalize cellulose nanocrystal and the resulting fluorescent photonic materials were characterized by FTIR, 13C-CP/MAS NMR as well as photoluminescent analysis to confirm the successful grafting. It can be concluded that the addition of 5 wt% of fluorescent modified CNC to chitosan matrix increase the photoluminescent properties as well as improved the mechanical properties of the Cs/CNC-dye biocomposite films. These photoluminescent biocomposite film hold promising applicative value in anti-counterfeiting material in large-scale.
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To selectively remove Cr (III) from synthetic phosphoric acid solution, a chelating ion exchanger was developed through Merrifield resin (MHL) functionalization with diethylenetriamine (DETA). The ...functional moieties of the grafted Merrifield resin were characterized and confirmed by means of Fourier-transform infrared spectroscopy. The morphological changes before and right after functionalization were visualized with Scanning electron microscopy and enhanced amine content was confirmed via energy dispersive X-ray. To assess the effectiveness of the MHL-DETA in the extraction of Cr (III) from a synthetic phosphoric acid solution, batch shaking adsorption tests were conducted through optimizing different factors such as contact time, metal ion concentration and temperature. According to our findings, higher adsorption was achieved when increasing contact time and decreasing metal ion concentration, while temperature variation doesn’t affect much the process. The higher sorption yield was found to be 95.88% attained within 120 min at room temperature without varying the solution’s pH. Under optimum conditions (120 min, 25 °C and 300 mg. L
−1
), the total sorption capacity was reported to be 38.35 mg. g
−1
. The system’s adsorption behavior was found to be consistent with the Langmuir isotherm and the pseudo second-order model accurately described the kinetic data. In this view, Merrifield resin functionalized with DETA could be used as a promising adsorbent material for Cr (III) adsorption from synthetic phosphoric acid medium.
Human immunodeficiency virus (HIV) infection is a major problem for humanity because HIV is constantly changing and developing resistance to current drugs. This necessitates the development of new ...anti-HIV drugs that take new approaches to combat an ever-evolving virus. One of the promising alternatives to combination antiretroviral therapy (cART) is the molecular hybrid strategy, in which two or more pharmacophore units of bioactive scaffolds are combined into a single molecular structure. These hybrid structures have the potential to have higher efficacy and lower toxicity than their parent molecules. Given the potential advantages of the hybrid molecular approach, the development and synthesis of these compounds are of great importance in anti-HIV drug discovery. This review focuses on the recent development of hybrid compounds targeting integrase (IN), reverse transcriptase (RT), and protease (PR) proteins and provides a brief description of their chemical structures, structure–activity relationship, and binding mode.
The objective of our work is to study the viscosimetric and the rheological behaviors of new epoxy resin namely: Tetraglycidyl ether urea of bisphenol A (TGEUBA) and its composite. Furthermore, we ...determined the viscosity of (TGEUBA/Methanol) system using the viscosimeter VB-1423 Ubbelohd capillary type. Besides, the viscosity of epoxy resin TGEUBA crosslinked by methylene dianiline (TGEUBA/MDA) and the rheological properties of different composite (TGEUBA/MDA/TGEMDA + TSP) formulated by two charges such as tetraglycidyl ether of methylene dianiline (TGEMDA) and trisodium phosphate (TSP) at various percentages (0%, 10% and 15%) were determined using the RHM01-RD HAAKE rheometer.
•Viscosity increases according to concentration in (TGEUBA/Methanol) system increase.•Decrease of viscosity indicates that the resin changes from viscous state to liquid state.•Rheological behaviors of composite increase with TGEMDA and PTS as a fillers increase.•Addition of organic charge TGEMDA in composite gives a better increase than of mineral charge PTS.
Idiopathic granulomatous mastitis is an uncommon, long-lasting inflammatory condition of the female breast. It is characterized by the development of a painful breast mass that gradually increases in ...size. This condition is benign and its cause is unknown. It primarily affects women of childbearing age who have a history of pregnancy and breastfeeding. The main feature of idiopathic granulomatous mastitis is the presence of chronic inflammation in the breast.
We report a 36-year-old woman with a history of pregnancy and breastfeeding presented with pain and swelling of the right breast. Physical examination revealed a mass with redness and retraction of the nipple. Imaging revealed localized density and hypoechoic areas with collection, suggesting granulomatous mastitis. A biopsy confirmed the diagnosis. The abscess was drained through a small incision performed under local anesthesia. Treatment with corticosteroids resulted in significant improvement, with complete resolution after one month.
A comprehensive evaluation of potential causes is necessary to confirm the diagnosis of idiopathic granulomatous mastitis. Histologically, it is distinguished by the predominant presence of neutrophils and the absence of caseous necrosis. Treatment remains controversial, with recent literature supporting the efficacy of conservative management with steroid and immunosuppressive therapy, leaving surgical excision for complicated and refractory cases.
Idiopathic granulomatous mastitis is an uncommon breast condition where the exact causes and recommended treatment approaches are not well-defined. It is important to consider this condition in women who are in their reproductive years.
•Idiopathic granulomatous mastitis is a rare chronic benign inflammatory mastopathy.•The clinical and radiological aspects are variable.•It may be mistaken for breast cancer on mammography.•The pathological examination remains the main element of certain diagnosis.
Cu
I
-exchanged solid based on montmorillonite material was investigated as catalyst in organic synthesis. The catalytic potential of this material was evaluated in the Huisgen 3 + 2cycloaddition. ...This catalytic system has been examined and proved to be an efficient heterogeneous catalyst for this “click chemistry”-type transformation. The ensuing catalyst can be recycled and reused five times without dramatic yield loss.
Graphical Abstract
The smart city has become a persistent need and is no longer just a concept. The concept of smart cities heavily relies on collecting enormous amounts of data. This paper proposes a ...data-management-based solution for smart city, which is labeled Smart Systems Oriented Big Data Architecture. Big data technologies have become essential to the functioning of cities. The architecture includes complex components to be implemented based on the architectural requirements. A data migration strategy was proposed to handle the various data sources such as IoT devices, video cameras, and drones. The proposed approach also takes into account data processing and data storage. The technical constraints related to data processing in a big-data environment are also studied. We also consider data modeling from a business intelligence point of view and a data science perspective. Our main goal is to favor the facilitation of the daily life practices in the context of a smart city by providing the city administrators with a solution that helps them maintain their city smartly and effectively.
Novel pentafunctional epoxy resin, mainly based on pentaglycidyl ether pentabisphenol A of phosphorus (PGEPBAP) has been synthesized and characterized through different spectroscopic methods (FTIR,
1
...H NMR,
13
C NMR and
31
P NMR). Moreover, the analysis of the viscosity of (PGEPBAP/Methanol) system was determined by using viscosimeter VB-1423 of the Ubbelohde type. Furthermore, the analysis of the rheological properties of the matrix PGEPBAP and their (PGEPBAP/MDA/PN) elaborated composite was performed according the RHM01-RD HAAKE rheometer. In addition, the morphology of different (PGEPBAP/MDA/PN) prepared composite was determined by using the polarizing optical microscope.
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