In parallel we developed research activities in the use of zeolites as adsorbents and in catalytic processes related to environmental applications of necessity in Ethiopia.
Studies have demonstrated that pure microbial cultures have limitations for technical application because of necessity for sterile conditions, which leads to high cost, whereas mixed cultures or microbial consortia have been shown to be robust and more productive than pure strains.
While recognition is growing among ecologists that novel, invaded ecosystems have value, and while the on-the-ground application of biosecurity policies has of necessity adjusted to local contexts and other agendas, invasion biology could aid policymaking by better addressing the three complexities inherent in the three dimensions highlighted above.
The probable reasons may be (1) expensive apparatus required for the application of respirometric method, (2) necessity of skilled and efficient operating personnel to interpret the acquired data and (3) too little data for comparison between respirometric and BOD5/COD method to convince someone about the advantages of the first on the later (Wenxiang et al. 2008; Rahman and Islam 2013).
It should be noted that the purification process could be halted at this point depending on the application of the process and necessity for >99% pure colorless product.
The main limitation for the therapeutic application of rHDL is the necessity to isolate HDL apolipoproteins from human serum, or to resort to cell expression systems that secrete recombinant human apoA-I (14, 15).
Contrary to the solid bricks, the application of sophisticated methods is a necessity.
Finally, the necessity of application of optimum thick thermal barrier coatings with compositionally optimised NiCoCrAlY coating, which can protect the gas turbine engine blade materials significantly against both oxidation and hot corrosion conditions, is emphasized.
The trend of microelectronic products in the textile or medical field is toward higher functionality, miniaturization, application of new materials and a necessity for deformable electronic circuits for improving the comfort control.
Profits coming from better structural model, use of suitable composite materials and better techniques of manufacturing, both the blades and composite materials, causes necessity of application of numerical modeling and optimization techniques.
