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Custom Chemistry Essays
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Chemistry Essays: Polyurethane Solvent Waterborne
What are the application differences of a Polyurethane dispersion coating compared to a solvent based polyurethane and what are the advantages upon each other? A polyurethane coating is a versatile product with many advantages upon other coating systems. A major disadvantage of classical, solvent based polyurethane coatings, are the volatile organic compounds (VOCs) present in the wet state. New regulations force formulators to keep the VOC content below 350 g/l.
Recent developments dealt with this problem. Developers have succeeded in making a polyurethane dispersion in water, eliminating most of the volatile organic solvents. However, the costs of a so called water borne polyurethane are higher than that of a solvent based polyurethane. A question that may arise is whether or not the dispersed polyurethane performs the same way as the classical, solvent based, polyurethanes and whether or not it is worth the money.
Besides possible differences in performance, processing techniques may differ. The goal of this investigation is to give an overview of the differences between the performance, processing and cost between a polyurethane dispersion and solvent based polyurethanes. The major formulations of both types will be summarized and compared to find the best coating.
Chemistry Essays: Microtubules Structure Functions
Describe the Structure and Functions of Microtubules - Why Can Drugs That Interfere With Microtubule Assembly Be Used as Cancer Therapy? Microtubules form as a highly organised network of polarised tube filaments from a protein called tubulin. Its regulation is needed for processes such as mitosis, cell migration, cell signalling and cell trafficking. The microtubules themselves are regulated by several kinases and phosphatases via signalling cascades, and concomitantly by interactions with actin cytoskeleton and adhesion sites.
Microtubule-targeted drugs (MTDs) constitute a major anticancer therapeutic class having properties of anti-mitotic and anti-angiogenic properties, thereby inhibiting malignant cell growth mainly by altering microtubule dynamics in both cancer and endothelial cells. The key to design of MTDs and the understanding of tumour progression regulators is the identification of proteins regulating the microtubule network.
As the name implies, microtubules are hollow tubes having an external diameter of roughly 25nm and a cell wall thickness of 5-7nm. One of their functions is to transport organelles (e.g. secretetory vesicles) through the cytoplasm, a particularly important role in nerve cells where axoplasmic flow is required. They also have a critical role in cilia and flagella movement. Microtubules originate from a complex structure known as centrosome.
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