Meanwhile, well get our liquid transportation fuels from ever-more-challenging sources of oil.
These new circuits direct microbes away from easy carbon sources such as glucose, he says, and toward more challenging food sources in industrial chemicals.
This becomes even more challenging if those sources are distributed across multiple organizations.
The process of matching two large scale data models is time consuming and cumbersome when performed manually, and becomes even more challenging when a source and/or a target model is being updated frequently to meet the ever expanding real world requirements.
The complexity of the human urinary proteome, the extensive post-translational processing of its proteins, the interindividual and intraindividual variability of protein content based on diet, exercise, sexual activity, and microbial colonization also render biomarker discovery projects more challenging than other sample sources.
However, identifying uniquely elevated levels of tumour-derived exoRNAs in a high background of normal exoRNA from other serum microvesicle sources is more challenging than identifying systemic changes, such as the depressed lymphocyte count and ribosomal protein RNA levels.
However, as the implementation of OCT systems and light sources, especially swept sources, becomes more and more challenging with increasing bandwidth, it is important to know a priori whether a broad spectrum can be used effectively.
The use of a simple analytical approach instead of a complex numerical simulation allows readily modeling of more and more challenging systems such as multi-source X-ray tubes.
Reservoirs for extraintestinal infections are often unknown, as traceback investigations that link infection to source are more challenging than for traditional foodborne diarrheal infections with shorter "incubation" periods.
More established playwrights have also selected challenging sources: Caryl Churchill based Soft Cops on Michel Foucault's Discipline and Punish; Tom Stoppard drew on Michael Bakunin and Alexander Herzen's social and political theories for The Coast of Utopia and on Wittgenstein's logical positivism for the acrobatic Jumpers.
