The phrase "a number of vectors" is correct and usable in written English.
It can be used when referring to multiple vectors in a mathematical or scientific context.
Example: "In this study, we analyzed a number of vectors to determine their impact on the overall system."
Alternatives: "several vectors" or "multiple vectors".
A number of vectors are being designed to optimize the expression of transgenes.
A number of vectors based on viruses that infect herbaceous plants are in use for expression or silencing of genes in plants as well as screening unknown sequences for function.
In 1978 Fred Klein published The Bisexual Option, a groundbreaking psychological study of bisexuality that was based on the so-called Klein Sexual Orientation Grid, a multidimensional system for describing complex sexual orientation that measured a number of vectors of sexual orientation and identity, allowing for change over time.
In this study, we compared a number of vectors based on the genome of Sindbis (SINV) and Venezuelan equine encephalitis (VEEV) viruses for their ability to express the Rift Valley fever virus (RVFV) envelope glycoprotein Gn and induce a protective immune response against RVFV infection.
In a blog post from last week, GitHub said there were a number of vectors being used in this attack, including some new and sophisticated techniques that involved using the web browsers of unsuspecting users to flood the GitHub site with traffic.
For transmission in the MAC phase, source node S i generates a preamble followed by a number of vectors of OFDM data symbols: Let x i = [xi,0xi,1 ⋯ xi,N − 1] T and xi,d = [xi,d,0xi,d,1 ⋯ xi,d,N − 1] T denote the time-domain representations of the preamble constructed by a training sequence and of the OFDM data symbol vector, respectively, of S i.
In addition, we have created a number of vector backbones that can be used to vary the residues that are appended to the target protein following CPD-mediated cleavage, which can range from a single amino acid residue to an HA epitope tag (Figure 2).
A number of vector control methods are available as alternatives to DDT.
E. coli expression of Ab derived fragments has been highly successful and a number of vector systems and expression strategies exist ([ 21] and references herein).
