The phrase "rare usage" is grammatically correct and can be used in written English.
It is typically used to describe a word or phrase that is not commonly used in everyday speech. Example: "The author used a word that is in rare usage, making the sentence difficult to understand."
The word pasta, which only 10 years ago was in rare usage in favor of macaroni, is now a buzzword among the upwardly mobile.
The slightly higher mental exertion required in the computer-based format could be explained by the students' familiarity with paper-based examinations and the rare usage of the graphical user interface.
Rare usage of GAGs as acceptors in P. patens is in agreement with previous work which shows that functional acceptors are only very rarely GAGs - the order of preference for the nucleotide preceding the AG in functional acceptors is C > T > A > G, which has been shown both by experimental work [ 31] as well as by in silico analyses of NAGNAG splicing [ 5, 12].
But it represents only British English, and 100m words is not so many when linguists search for rare usages.
"Rare earth usage in China will be increasingly greater than exports," said Zhang Peichen, the deputy director of the government-linked Baotou Rare Earth Research Institute.
Molycorp has watched as automakers like General Motors and Toyota and a variety of chemical companies have said in the past month that they were looking at ways to reduce sharply their rare earth usage.
However, rare codon usage in low G+C regions supports the hypothesis that these regions were horizontally transferred (Table S2).
These results are summarized in Table S4, and a scheme summarizing the regulatory effects of Hha in biofilms, and its role in cell death is presented in Figure 5. Taken together, these results show that a rare codon usage is a characteristic of the regulatory and structural type I fimbriae genes.
Surprisingly, no correlation between 5' mRNA structure and rare codon usage was observed.
This initial difficulty may be due to the rare local usage of these words to describe their children.
There are several obstacles to the expression of tPA in prokaryotic systems, including disulfide bond formation, rare codon usage, and cytotoxicity [ 13].
