Sentence examples for been difficult to isolate from inspiring English sources

First, many of these drugs have been difficult to isolate in large quantities from their biological sources and have been challenging to synthesize.

Tumours shed small amounts of cancer cells into the bloodstream, but it has been difficult to isolate and grow these cells.

But it has been difficult to isolate large numbers of these cells from the mix of tissue types that can develop from embryonic stem cells.

Homology modeling was critical for this project because, as a large transmembrane protein, ScPma1p has been difficult to isolate and crystallize.

The zygote/ookinete stages of P. falciparum are diploid and P. falciparum ookinetes have been difficult to isolate in large numbers.

However due to the non-specificity of these interventions, it has been difficult to isolate the component that initiates the reinforcing behavior, which may eventually lead to addiction.

Moreover, it is difficult to isolate intact organelles, and leakage of matrix proteins during the isolation procedure is invariably observed.

It also could be difficult to isolate from the solvent.

Such systems, however, can be difficult to isolate and to access via microscopy.

It's difficult to isolate specific reasons for increased or decreased turnout.

Microorganisms, by definition, are tiny, and as such are difficult to isolate, grow and study.