These include the focus on the traditional teacher-centered model, the lack of human interaction, the lack of interactivity around the video content, lack of personalization, as well as assessment and feedback.
At a recent San Francisco conference sponsored by financial firm J.P. Morgan, panel members acknowledged numerous stumbling blocks to interactive television's widespread use: lack of available content, lack of customer access to digital television or speedy Internet connections and, most importantly, lack of customers.
Individual barriers influencing CPG use include e.g., lack of awareness of an existing CPG, unfamiliarity of content, lack of motivation, lack of time, lack of training, resistance to change, and lack of "local champions" [ 13].
We have previously proposed that a subclass of lncRNAs, 'macro' lncRNAs, show RNA biology hallmarks such as inefficient splicing, extreme length, high repeat content, lack of conservation and a short half-life.
In zebrafish, morpholino oligonucleotide-mediated knockdown of popdc2 results in misshaped heart chambers with reduced myofibrillar content, lack of trabeculation and embryonic heart failure characterized by large pericardial oedema and defective heart looping [ 17].
The barriers range from poverty, poor quality of education, lack of modernized education content, lack of flexible services for young people with special learning needs and disabilities, lack of non-formal learning opportunities, restrictive gender roles, early marriage and particularly for Tajik female students, lack of parental support.
The poor transduction of some mammalian cell lines, e.g. lines of haematopoietic origin [ 29] or cells in suspension as opposed to adherent culture [ 30] might be the result of low surface charge, inappropriate lipid content, lack of transport functions [ 11] or blocks to subsequent transgene expression.
Although important, gene signatures have many issues as descriptors - for instance, loss of specificity in validation studies with an increased number of samples [ 10], generally poor cross-platform compatibility (Amsterdam and Rotterdam signatures virtually do not overlap in gene content), lack of mechanistic (functional) correlation with phenotype, etc.
Despite recent progress in developing active and durable oxygen reduction catalysts with reduced Pt content, lack of elegant bottom-up synthesis procedures with knowledge over the control of atomic arrangement and morphology of the Pt alloy catalysts still hinders fuel cell commercialization.
In this presentation the emphasis will be on the content, or lack of content, of these databases including the chemical structures and related/linked information.
