Sentence examples for proved difficult and even from inspiring English sources

Obtaining high quality DNA proved difficult, and even an extraction protocol developed to eliminate contaminants present in ascidian tissues and tested specifically on Pyura stolonifera [ 42] did not produce better results than standard extraction protocols.

In a Finish study, an attempt to construct 'health indices' based on all relevant factors associated with good health proved difficult, and even though there were clear associations between health behaviors, their distribution into different combinations were quite diverse [ 50, 51].

Worse, they tended to "acquire a life of their own … and prove difficult and unpopular to stop, even when the benefit-cost equation does not stack up".

Such projects – he presciently suggested – might prove "difficult and unpopular to stop, even where the benefit-cost equation does not stack up".

The results of the test, which proved difficult for even some of the fittest units, and anecdotes from around the Army and other branches of the service, appear to support their point.

But these points are not the case in much of West Africa, where containing the virus has proved difficult – even among doctors and nurses.

At the last census [in 2001] it proved difficult to even find all the households in some local authorities, so it's not surprising councils would have a problem," he told the BBC.

In addition, all their information systems were "home-grown," and disseminating them has proved difficult even to small hospitals within their own networks.

Though a 15-mile channel was eventually finished, Mr. Trowell added, a sandy ridge proved difficult to breach, even for Appalachian gold miners, and the project faltered.

Korean society is organized around group affiliations — hometown ties and school and corporate friendships — so meeting a potential spouse without formal introductions to merit family approval has proved difficult, even for those enamored with the concept.

LONDON — Eileen Hogan has never lacked admirers, not least among her fellow artists, but how she achieves the effects she does in her work has proved difficult to analyze even for the most expert of eyes.