Sentence examples for remains problematic to from inspiring English sources

The heavy ion component of the cosmic radiation remains problematic to the assessment of risk in manned space flight.

However, it remains problematic to apply this newborn technology to the biological and medical fields, since synthesis of single-chain polymeric nanoparticles relies heavily on controlled/living radical polymerization of vinyl based monomers, yielding a persistent non-degradable carbon-carbon based backbone.

Philosophers of the seventeenth century were sketching out a concept that remains problematic to this day.

Although the THC concentration in OF correlates strongly with that in blood on the population level, it remains problematic to estimate blood THC concentrations based on OF samples for individual drivers (Gjerde et al. [2011b]; Ramaekers et al. [2006]).

However, it remains problematic to determine the parameters of V and K.

Major histocompatibility complex associations have been found for many diseases, but it remains problematic to identify the causative variation.

Using it simply to prospect for customers remains problematic owing to the hostility of many users to commercial advertising on the Internet.

Delivering assistance to the northern area remains problematic due to road bandits and clashes between armed groups and government forces.

However, research involving critically ill patients remains problematic due to the lack of guidance on how to protect vulnerable subjects adequately [1, 6].

However, research involving critically ill patients remains problematic due to the lack of guidance on how to protect vulnerable subjects adequately [ 1, 6].

The stereotactic delivery of therapeutic agents into putamen (or other subcortical structures) via CED remains problematic due to the difficulty in knowing what volume of therapeutic agent to deliver.