Nevertheless, the low hydroxide conductivity remains major challenge that limits the development and application of APEFC.
One major challenge that needs to be addressed is the photoluminescence trapping and the consequent photon recycling.
However, controlling the MSC secretome post-transplantation is considered a major challenge that hinders their clinical efficacy.
Web service selection constitutes nowadays a major challenge that is still attracting the research community to work on and investigate.
One major challenge that has come back to these and other assessments has been in relation to the accuracy of the numbers they have arrived at.
Despite the undeniable progress made with respect to CSR, creating momentum for sustainability and social change still remains a major challenge that requires further examination.
However, the oxidation resistance of Cu-based electrical contact materials at high temperatures is still the major challenge that limits their applications.
Previous research has identified the cathode chemistry as a major challenge that must be addressed for further development of Mg-based batteries.
Separation of biologically synthesized chemicals from process streams is a major challenge that can contribute to > 70% of the total production costs.
The lack of data related to durability is one major challenge that needed to be addressed prior to the widespread acceptance of natural fibre reinforced polymer composites for engineering applications.
However, there is no evidence that even a mixed VLP vaccine will protect against types not included in the vaccine, and a major challenge that remains is how to engineer protection across a broader spectrum of viruses.
