The short duration of rough sessions shown by resident and outgroup sifaka could be due to the lack of specific meta-communicative signals in this species [3] and, therefore, to the difficulty to maintain the playful mood.
Therefore, rehabilitation training should be set at an appropriate level of challenge or difficulty to maintain the motivation of patients.
Other authors [ 14] found not only a greater difficulty to maintain the set but also more perseverative errors in obese with BED than in obese controls; this last result should be better addressed comparing BED obese patients with AN and normal-weight HC in order to ascertain if this is a real or a relative increment of perseverative errors.
Brexit and the end of free movement for EU workers (Favell, 2014) also poses serious difficulties to maintain one of the markers of European identity, namely, European citizenship (Zapata-Barrero, 2016a), and certainly contributes to the need to reframe the European project (Triandafyllidou & Gropas, 2015).
In this way, multiple clouds organizations have been formed with the objective of maximizing the use of cloud computing, in particular small- and medium-sized cloud providers who present difficulties to maintain all properties of the paradigm have mobilized themselves into organizations to maximize their revenues.
We showed that it is possible to overcome the difficulties to maintain in culture CTLs specific for self-antigens by transferring their TCR into allogeneic polyclonal T cells, which could be easily expanded in culture.
This is achieved by estimating the learner's current knowledge in a discrete model of this problem space, and by using this representation to present the learner with problems at the level of difficulty required to maintain the desired success rate.
However, on many peatlands rewetting is not possible due to their position in the landscape and the associated difficulty to maintain a high stable water table.
