Sentence examples for proven difficult to obtain from inspiring English sources

However, spectroscopic evidence has proven difficult to obtain.

In reality, this has proven difficult to obtain, partly because it requires rare equipment, and partly because the spinning process becomes increasingly complicated to optimize with each added layer.

One, is that normal SF has proven difficult to obtain, and two, early OA represents an appropriate non-inflammatory comparison, to our inflammatory PsA SF [ 41].

How and which of these modes are used for particular processes remains unclear, as experimental proof of this proposition has proven difficult to obtain in vitro.

Probably because of regions of high flexibility and the propensity of dynamin family members to self-assemble, high-resolution structural data for more than individual domains has proven difficult to obtain.

Empirical analysis of the effect of social distancing behavior on epidemiological dynamics is of clear interest, but it has proven difficult to obtain representative data on actual behavioral responses to epidemics.

Fresh suet, however, as demanded by Gary Rhodes, proves difficult to obtain.

If the p/e ratio proves difficult to obtain, another useful measure is available: The house-price-to-income ratio.

For one thing, insurance can prove difficult to obtain from an existing provider, so sellers may have to shop around for a new policy.

It has always proved difficult to obtain objective information on the reliability of proprietary emergency water treatment systems, or their limitations when actually in use during a crisis.

Since myotonic disorders are rare it has generally proved difficult to obtain class I level evidence for anti-myotonic drug efficacy by performing randomized placebo controlled trials.