There is a vast multitude of materials with strongly differing properties. A
copper wire, for instance, can be bent easily into a new shape, whereas a
rubber band will snap back to its initial form after deformation, while the
attempt to bend a glass tube ends with fracture of the tube. The strongly
differing properties are reflected in the application of engineering materials –
you would neither want to build cars of glass nor rubber bridges. The multitude
of materials enables the engineer to select the best-suited one for any
Legibility and focus upon the content was a primary design consideration, as it is hoped
the timeline will grow through a wealth of contributions. Early research to incorporate imagery
into the timeline revealed the hurdle of copyrighted material on the World Wide Web, and the
entanglement of Academic Fair Use, images in the public domain, partially copyrighted material,
and 100% copyrighted material.
Nanotechnologies have already attracted massive interest in multiple fields of science and industry. In the past decades, we have witnessed the progress in micro-level experimental techniques that revolutionize the material science. Designing new materials based on the knowledge of mechanics of their building blocks and microstructure manipulations at nanometer scale have become a reality. Nanoindentation, as a leading micro-level mechanical testing technique, has attracted wide attention in numerous research fields and applications....
The chapter commences by reviewing the properties of the broad classes of materials used in film coating, polymers, plasticizers, pigments and solvents (or vehicles). An initial consideration of the polymers shows that while processing is most commonly performed using these materials in solution, there are systems which utilize polymers in suspension in water. The mechanism of coalescence and film formation for these types of materials are discussed.
Modified release coatings
John E.Hogan SUMMARY Relevant aspects of the composition and performance of modified release coatings are considered in this chapter. Initially, the basic characteristics of multiparticulate systems are described and comparisons are made with the performance of whole tablets intended for modified release. The properties and effects of the polymers and plasticizers which are used in modified release coatings are illustrated with examples from the literature. This further develops the basic treatment of these materials provided in Chapter 2.
Currently, one of the most established and widely accepted stem cell bank systems is
umbilical cord blood banking. However, the establishement of somatic stem cell bank
other than cord blood (non-hematopoietic stem cells) is still underway. The nature of
somatic stem/progenitor cells is much different from that of embryonic stem (ES) cells
and induced pluripotent stem (iPS) cells. Somatic stem/progenitor cells possess limited
ability to differentiate compared with ES cells and iPS cells.
The technological conditions of obtaining the polylactic acid-Vietnamese cassava starch blend on the mix-brabender were investigated. The optimal conditions were: temperature 160o C, reaction time 6 minutes, screw speed 45 r/min., initial material ratio in weight percentage PLA80- PEG10-TB20. Polyethyleneglycol (PEG) as a plasticizer, PN-47 as a distribution agent was used. It showed that the optimal starch content was 20 wt%. Increase in starch content lead to increase in water absorbability and weight loss of the materials.
Tissue-type plasminogen activator (t-PA) has recently been identified as a
modulator of neuronal plasticity and can initiate conversion of the pro-form of brain-derived neurotrophic factor (BDNF) into its mature form.
BDNF also increases t-PA gene expression implicating t-PA as a
downstream effector of BDNF function.
Polyethylene-starch blend polymer has already found to be a potential candidate to replace non-degradable plastic in packaging . However, the degradation of that polymer in natural ambience (soil burial test) needs to be further evaluated. The purpose of this study is to investigate the degradability of PE-starch blend polymer in soil and in liquid medium. The soil is added starch degrading bacteria isolated from natural soil.