الحلقات النقاشية

The preparation of a range of amino acid derived guanidine organocatalysts is reported together with their application to the Michael addition of 2-hydroxy-1,4-napthoquinone to b-nitrostyrene, achieving a maximum ee of 56%. Some insight into the mechanism was sought by using X-ray crystallography and a detailed study of the intra- and intermolecular hydrogen bonding is reported

eco-friendly corrosion inhibitor

Cytokine storm is several disorders of immune dysregulation characterized by constitutional symptoms, systemic inflammation, and multiorgan dysfunction that can lead to multiorgan failure if inadequately treated, 1,2,3-Triazoles are one of the most important nitrogen-containing five-membered heterocycles and have a wide range of applications in pharmaceuticals, supramolecular chemistry, organic synthesis, chemical biology and industry.In the current work , the synthesized compounds (1d and 2d) were screened for their anticytokine storm by assay of IL-1b and IL-6 in vivo, confirmations and characterization of the chemical structures related to these compounds were performed using 1H-NMR spectroscopy, FT-IR spectroscopy, and some physicochemical properties such as melting points. Docking study of the final synthesized compounds gave evidence about the affinity of these compounds significantly inhibited IL in comparison to positive groups

Over the past years, the problem that has most scientists and people in the world concerned is global warming. What leads to global warming is called the greenhouse effect, where the atmosphere builds up by gases, like methane and carbon dioxide, and keeps heat from the sun in the atmosphere, which increases the temperature on Earth. Many people think that global warming and the greenhouse effect are the same things but it is not. The greenhouse effect is the heat that comes from Earth so it may care for the needs of all life on earth. While global warming is an issue because the more gases that are produced by man the more gases will be in the atmosphere, which upsets the natural balance

GraphPad Prism is software tool that combines basic biostatistics, curve fitting and scientific graphing into one programme. Furthermore, it has tutorial for each statistical test which can help researchers to easy understanding how to use it. The aim of seminar is explain how to find and calculate probability for each test and results management

Chemistry is rooted in the laboratory where ideas, knowledge, and technique come together. Getting a chemical reaction to work satisfactorily, in a reasonable amount of time, and with a good yield can be tricky. One of the core principles of science, and an important moral rule, is to describe experimental procedures completely and carefully so that another person can reproduce the results.
Chemists have a professional responsibility to serve the public interest and welfare and to further knowledge of science. Chemists should actively be concerned with the health and welfare of coworkers, consumers and the community

Poly(vinyl chloride) (PVC) were prepared and the photo-stabilization of polymer films were studied using ultraviolet (UV) light. The efficiency of synthesized polymer complex of ibuprofen-tin which is the photo-stabilizer in this study afterward of 300 hr of irradiation were evaluated by calculate the rate constant of photodecomposition of PVC film. The outcome of this research has shown that the additives (ibuprofen-tin complexes) effect significantly on the decreases of the rate constant of photodecomposition of PVC films compare with the PVC blank, without additives the photodecomposition constant (kd) value for PVC films is higher than when the additives is added. The surface morphologies of the irradiated polymer film with additives were studied using Field Emission Scanning Electron Microscope (FESEM). It can be seen that the polymer film with added additives is less roughness than the irradiated PVC (blank). The organotin complexes behave here in this study as a photostabilizer to maintain the PVC from any decomposition by absorbing the incident light and convert it over the time as a heat to the polymeric chain

Soft ionic hydrogels have garnered significant interest for their applications in soft electronics and tissue engineering. However, further demands are still on the rise for developing these materials to possess flexibility, durability, low cost, non-toxic and reliable conductivity. In this work, a poly(acrylamide) (PAAm) hydrogel containing salt was utilised for its significant features such as high flexibility and excellent conductivity. Therefore, several hydrogels were prepared from the polymerisation reaction of the mononer acrylamide (AAm) to produce polymer networks of PAAm hydrogels by the use of crosslinking materials aiming to optimise their mechanical and electrical characteristics, with the aim of applying these hydrogels in soft sensing device

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