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Artificial tears are eye drops that mimic the tear film and relieve dryness and irritation of the ocular surface. They contain water, electrolytes, polymers, and sometimes preservatives. Learn about their chemistry, indications, side effects, and veterinary uses.
Eye drops are liquid drops applied to the eye for various purposes, such as lubrication, infection, allergy, glaucoma or dilation. Learn about the different classes of eye drops, how to use them, and what side effects they may cause.
Learn about the synthesis, structure and applications of phenol formaldehyde resins, a group of synthetic polymers obtained by the reaction of phenol or substituted phenol with formaldehyde. Novolacs are phenol-formaldehyde resins with a formaldehyde to phenol molar ratio of less than one, and can be cured with a hardener.
Single-use medical devices are intended for one single patient and one procedure only, and are not reusable or reprocessable. They are used for various purposes, such as diagnosis, treatment, prevention, or control of disease or injury, and have different types, legislation, and environmental impacts.
Learn about the different types of capsules used to enclose medicines, such as hard-shelled, soft-shelled and single-piece gel capsules. Find out how they are made, filled and sealed, and what materials and equipment are involved in the process.
Learn about the composition, uses and risks of skin electrode gels, which are mixtures of water, thickener and electrolyte. Find out how they are used for medical and erotic purposes, and how they can cause fire hazards.
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