The phrase "a variety of types" is correct and usable in written English. You can use it when you are referring to multiple kinds of something, such as types of books, clothing, or animals. For example, "The library has a variety of types of books for readers of all ages."
The researchers of the study assume the effectiveness of concept mapping on enhancing learners' reasoning, based on Khodadady and Ghanizadrh (2010) who contend that concept mapping is regarded as organizational tools such that concept mapping scaffolds a variety types of reasoning about content, make students think critically about the content of whatever they study.
Similarly, CD47 is also upregulated on a variety types of blood cancer and solid cancer cells [ 20].
To overcome the drawbacks of the traditional lectin based methodologies, combined with the powerful characteristics of microarray format: high-throughput, parallel analysis and miniaturized format, we and others have developed a variety types of lectin microarrays carrying a few to ~100 lectins [ 17- 21].
According to Mr. Clark, the Pentagon recently ordered shippers to accelerate deliveries of a variety of types of coal because there was a shortage at European bases.
The Kunsmann study also points to the value of a variety of types of physical exercise.
It is noteworthy that the CSA group showed a high prevalence of a variety of types of childhood maltreatment, including physical and emotional abuse and neglect.
Public interest law includes a variety of types of law-related work done in furtherance of the public good.
The troupe, many of whom are members of Rose's immediate family, play a modern interpretation of traditional African rhythms using a variety of types of drums and sounds.
Speciation of the latter four elements may be dominated by a complex array of chlorohydroxy complexes and, perhaps, a variety of types of halides.
He and his many colleagues identified a variety of types of capillary endothelium (fenestrated, continuous) and determined the role of caveolae in transporting macromolecules across endothelial cells.
Since 1992, when the former polytechnics became universities, there has been a tension between the benefits of sharing that label and the national need for a variety of types of institution.
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Ha Thuy Vy
MA of Applied Linguistic, Maquarie University, Australia