1. Introduction
The term microgels are consists of two words and both these words have totally different meanings. The micro word is associated with the gel particle size. The word gel of microgel describes the swallon power of particles in suitable organic solvent [1]. So microgels contain very large molecular weight polymeric organization. Every particle of gel was existing as a particular polymer fragment. It is also define as colloidal scattering of gel molecules. The particle size of microgels should be lie from 10-1000nm [2]. The microgels plays an important role in the area of drug delivery[3]. The microgels also gains popularity in the field of nanotechnology and it enhanced day by day[4]. The greater change in their size is observed by varying the ionic strength or by applying the electric and magnetic field, by temperature and pH[5]. The particles of microgels are rounded and contains a water swallon polymeric organization [6].The amount of water for microgels are in the range from 10 to 90% which rely on the microgel diffusion chemistry. The
…show more content…
These are also very helpful for the drug encapsulation which are discharge on disintegration of polymer layer network. The factors on which the physically cross linked microgels are depends are polymer composition, ionic strength of the medium and on temperature. The physically cross linked microgels are prepared from the biopolymers such as dextron, agarose and alginate[24]. This is also very important type of microgels used in many fields.
2.2 Chemically cross linked
They are covalent in nature and this property enhance their stability than the physically cross linked counterparts. The monomers are copolymerizing for the preparation of chemically cross linked microgels in the presence of multifunctional cross linking
Epithelia tissue : Epithelial tissue, the type of tissue that lines the surfaces and cavities of your body 's organs, epithelia may be composed of several layers of cells called compound epithelia or just a single layer known as simple epithelia.
If you are like many people, you may have heard of professional microdermabrasion, but you don't know exactly what the procedure involves. You may also wonder whether it is worth the small investment over using at-home face scrubs that also remove dead, dry skin from your face. The truth is that microdermabrasion is much better for your skin than those over-the-counter or DIY face scrubs, and here are two reasons why.
A group of polymer chains can be organised together in a fiber. How the polymer chains are put together is important, as it improves the properties of the material. The flexibility, strength and stiffness of Kevlar fiber, is dependent on the orientation of the polymer chains. Kevlar fiber is an arrangement of molecules, orientated parallel to each other. This orderly, untangled arrangement of molecules is described as a “Crystalline Structure”. A manufacturing process known as ‘Spinning’ is needed to achieve this Crystallinity structure. Spinning is a process that involves forcing the liquefied polymer solution through a ‘die’ (small holes).
Hydrocolloid dressings have been utilized in the midst of countless health care facilities due to the increasing number of decubitus ulcers. Decubitus ulcer, also commonly known as bedsores or pressure ulcers, is an exposed wound on your skin frequently occurring on the skin concealing bony areas. It is mutual among the elderly, people who devote prolonged periods of time in bed or a wheelchair, and individuals who cannot move particular body parts without assistance (Solan, 2014). Many diverse prevention dressings have been introduced across the years to diagnose pressure ulcers; this paper pursues to examine appropriate literature to evaluate and compare the efficacy of hydrocolloid dressing in patients with decubitus ulcers.
In this analysis, the feasibility of X-Aerogel in many other fields will be reported by analyzing strengths, weaknesses, opportunities and threats.
Aerogel was discovered in the late 1930’s by chemist Samuel Stephens Kistler. He accomplished this by the process of supercritical fluid drying. A supercritical fluid is any substance at a temperature and pressure above its critical poi...
The cytoskeleton is a highly dynamic intracellular platform constituted by a three-dimensional network of proteins responsible for key cellular roles as structure and shape, cell growth and development, and offering to the cell with "motility" that being the ability of the entire cell to move and for material to be moved within the cell in a regulated fashion (vesicle trafficking)’, (intechopen 2017). The cytoskeleton is made of microtubules, filaments, and fibres - they give the cytoplasm physical support. Michael Kent, (2000) describes the cytoskeleton as the ‘internal framework’, this is because it shapes the cell and provides support to cellular extensions – such as microvilli. In some cells it is used in intracellular transport. Since the shape of the cell is constantly changing, the microtubules will also change, they will readjust and reassemble to fit the needs of the cell.
All polymer host has some major advantages for which their application in electrochemical devices are still continuing. Also these polymer have some disadvantages and to improve the
Intro Microplastic particles in wastewater have become a global issue that is having detrimental effects on not only the water system, but the food chain as well. Many countries have recognized these tiny plastic particles as a problem, and are in the process of banning manufacturers from producing products such as toothpastes and body cleansers that contain polyethylene microbeads. The objective of this review is to shed light on the prevalence of microbeads in our water systems; they cannot be filtered out of the water due to their small size. This in turn puts many ecosystems at risk, and could potentially be quite harmful to humans in the long run. Relevance of water quality issue This issue affects mankind, aquatic species, and the cleanliness of the water system on a large scale.
chains instead of hydrogen atoms. Cross-linking is another way in which the polymer can be made stronger. This involves ultraviolet radiation that bombards the polymer with electrons and formulates bonds between the molecular chains of the polymers. This is like linear polyethylene but different in that it is more impact resistant, and it has a much higher density. This allows it to be stored or be used with different chemicals that would normally cause the polymer to desolve.3 This can start to become a problem because as the polymer continues to become chemically enhanced. So the ways of dissolving and recycling the polymer become more difficult.
One of the main challenges that face the environment today is the threat of plastic materials in the environment. All forms and sizes of plastic are harmful to the environment; this paper looks at the effects of microplastics which are small forms of plastic that are at least 5mm in size. Due to their small size, the microplastics end up being ingested into the bodies of aquatic animals causing health consequences that are uncertain to the organisms. This review focuses on the susceptibility of marine organisms to the physical, chemical and biological uptake of microplastics.
As known by now, Tissue Engineering is the combination of the cell, engineering material and suitable biochemistry factors that are used to improve the biological functions. There are 4 types of Tissue Engineering, mainly which are Autograft, Isograft, Allograft and lastly Xenograft.
The connective tissue is the most abundant and widely distributed in complex animals. It is made up of a matrix consisting of living cells and non-living substance called ground substance. The ground substance is made of an organic substance (protein) and an inorganic substance (usually a mineral or water). It separates the cells and varies in consistency from solids to semifluid to fluid. The principal cell of connective tissue is the fibroblast which makes the fibers found in nearly all connective tissues. There are three kinds of fibers; the white collagen fibers contain collagen, a protein that gives them flexibility and strength. Reticular fibers are very thin collagen fibers that are highly branched and form delicate supporting networks. The yellow elastic fibers contain elastin; a protein that is not as strong
Leboffe, M. J., & Pierce, B. E. (2010). Microbiology: Laboratory Theory and Application, Third Edition 3rd Edition (3rd Ed.). Morton Publishing
Many people don't know what biomedical engineers do. A biomedical engineer’s job is actually quite interesting. They analyze and create solutions to improving the quality and effectiveness of patient care. They also design technology to accommodate the needs of people with disabilities. They have a big role in helping people begin new lives. The main job of a biomedical engineer is to help create prosthetic limbs or organs for those who are in need of one.