Helix Review

Polymeric nanoparticles, what is polymeric nanoparticles, definition of nanoparticles, method of synthesis/preparation of nanoparticles, advantages and disadvantages of nanoparticles. Introduction/definition They are solid colloidal particles ranging in size from 10 to 1000 nm (1μm). Drug may be dissolved, entrapped, encapsulated or attached to a nanoparticle matrix. Because these systems have very high surfac areas, drugs may also be adsorbed on their surface. Polymer-based nanoparticles effectively carry drugs, proteins and DNA to target cells and organs. Their nanometer-size promotes effective permeation through cell membranes and stability in the blood stream. Types of Polymeric nanoparticles 1. Nanospheres 2. Nanocapsules Nanocapsules : They are systems in which the drug is confined to a cavity surrounded by a unique polymer membrane. Nanospheres : They are the matrix system in which the drug is physically and uniformly dispersed. Polymer used in preparation: Natural hydroph...

Synthesis of nano materials, gold nanoparticles, magnetic nanoparticles, method of synthesis Gold nanoparticles Gold nanoparticles are emerging as promising agents for cancer therapy These are beneficial in diagnosis of cancer due to their photo physical property and optical property Unlike conventional cancer treatment, the golden nanoparticle approach uses no toxic chemicals and no radiation, reducing the risk of unpleasant side effects. Golden nanoparticles occur as cluster of gold atoms up to 100nm in diameter. Nanogold has unusual visible properties as the particles are small enough to scatter visible light. Types of Gold Nanoparticles 1. Nanorods 2. Nanoshells 3. Nanocages   Synthesis of Gold Nanoparticles 1. Turkevich Method 2. Brust Method 3. Martin Method 1. Turkevich Method Small amounts of chlorauric acid is reacted with small amounts of sodium citrate solution. The colloidal gold will form because the citrate ions act as both a reducing agent, and a capping agent. There...

Introduction to Nanotechnology, d efinition of nanotechnology, h istory of nanotechnology, u nique properties of nanomaterials, c lassification of nanomaterials, advantages and disadvantages. Definition of nanotechnology Nanotechnology is the term derived from the Greek word "nano'' meaning ''dwarf''. Applied in the principle of various science at a atomic, molecular or submicron level. Nanotechnology is science, engineering, and technology conducted at the nanoscale, which is about 1 to 100 nanometers . Nanotechnology are the study and application of very small things and can be used across all the other science fields, such as chemistry, biology, physics, materials science, and engineering etc. Nanotechnology  refers to the branch of science and engineering involved in designing, producing, and using structures, devices, and systems by manipulating  atoms  and  molecules  at  nanoscale , i.e. having one or more dimensions of the order of 100...

What is Respiratory Tract infection? Acute Respiratory infection, Chronic Respiratory infection,  Acute Respiratory Infections (ARD) Acute respiratory infection indicates infection of any part of the respiratory tract of less than 30days duration and otitis media of less than 14days duration. The infection mainly includes acute episodes of cough, cold, running nose, hoarseness of voice, ear discharge, fast breathing, breathing difficulty and chest indrawing with or without fever. A severe infection that prevents normal respiratory function is an acute respiratory infection. It typically starts in the nose, trachea (wind pipe), or lungs as a viral infection. It can spread to the entire respiratory system if the infection is not treated. Acute respiratory infection prevents oxygen from being absorbed by the body which can lead to death. People suffering from this disorder urgently need medical assistance. Classification of ARI: Acute respiratory infections are divided into Upper res...