美国国家标准与技术研究院（National Institute of Standards and Technology，NIST）直属美国商务部， 从事物理、生物和工程方面的基础和应用研究， 以及测量技术和测试方法方面的研究，提供标准、标准参考数据及有关服务，在国际上享有很高的声誉。 NIST主要标准品 ...

An illustration of a magnifying glass. An illustration of a magnifying glass.

ABSTRACT: In the present study, 23 isolates, dominated by bacterial genera (74%) were isolated from petroleum sludge at refinery wastewater plant, Jeddah, KSA, by means of selective enrichment in ...

An illustration of a magnifying glass. An illustration of a magnifying glass.

Daniel Naroditsky, a chess grandmaster who started as a child prodigy and quickly became one of the most influential American voices in the sport, died Monday. He was 29. The Charlotte Chess Center in ...

This lake survey method employs standardized nets to assess Northern Pike, Walleye and other fish populations during the summer months. The Alberta government is in the process of calibrating North ...