By Arnold R. Lang
Dyes and pigments are elements that impart color to a fabric. The time period colorant is usually used for either dyes (also known as dyestuffs) and pigments. the key distinction among dyes and pigments is solubility (the tendency to dissolve in a liquid, particularly water). Dyes tend to be soluble - or might be made to be soluble - in water. as soon as a dye is dissolved in water, the fabric to be dyed will be immersed within the dye answer. because the fabric soaks up the dye and dries, it develops a color. If the cloth then keeps that color after being washed, the dye is related to be colourfast.Pigments are as a rule no longer soluble in water, oil, or different universal solvents. To be utilized to a cloth, they're first floor right into a tremendous powder and carefully combined with a few liquid, known as the dispersing agent or motor vehicle. The pigment-dispersing agent blend is then unfold at the fabric to be colored. because the dispersing agent dries out, the pigment is held in position at the fabric. as a rule, dyes are used for colouring textiles, paper, and different elements, whereas pigments are used for coloring paints, inks, cosmetics, and plastics. This ebook offers new and demanding examine from all over the world during this box.
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Additional resources for Dyes and Pigments: New Research
Scientists have uncovered the mechanisms of this procedure, developed several compounds accepted in clinical practice for treatment of various diseases and still are searching for more suitable photosensitizers. Similarly to development of every new group of drugs, the first accepted compound (porfimer, 1993, Canada) is of course not lacking side effects. However, the newest compounds seem to get very close to the “optimal” photosensitizer for therapy. Their photophysical, photochemical, and sometimes also pharmacokinetic properties were optimized for chosen treatments, although there is still a long way to go before they will be accepted in practice.
Hematoporphyrin Derivative and Laser Photoradiation in the Treatment of Lung-Cancer. Chest, 81, 269277.  McCaughan, J. , May, E. and Roach, R. (1984). Palliation of Esophageal Malignancy with Photoradiation Therapy. Cancer, 54, 2905-2910. , Boulos, P. , Chatlani, P. and Bown, S. G. (1990). Photodynamic Therapy for Colorectal-Cancer - a Quantitative Pilot-Study. Br. J. , 77, 93-96.  Kaye, A. , Morstyn, G. and Brownbill, D. (1987). Adjuvant High-Dose Photoradiation Therapy in the Treatment of Cerebral Glioma - a Phase 1-2 Study.
It is widely acknowledged that macromolecules have great potential as therapeutic agents. However, their use is often limited because they do not leave the endosomes within cells after endocytosis. g. disulfonated phthalocyanines and Photodynamic Therapy 35 meso-phenylporphyrins (Figure 12)) localize primarily into membranes of lysosomes and endosomes of cells. After irradiation, these subcellular structures rupture and release their content. So, the PCI principle is based on common administration of photosensitizer and the macromolecule drug into blood stream.