The phrase "a number of housekeeping" is not correct in written English as it is incomplete.
It can be used when referring to various tasks or activities related to housekeeping, but it needs to be followed by a noun to be complete.
Example: "We have a number of housekeeping tasks to complete before the guests arrive."
Alternatives: "several housekeeping tasks" or "various housekeeping duties".
While there remained a number of housekeeping tasks to perform after the race, not least being the re-exposing of manhole covers and the resolution of nagging lawsuits, the event was widely regarded as a success.
Specific 35mer probes were created for various genes involved in immune system pathways, as well as a number of housekeeping genes.
In addition to the 72 TRIM gene transcripts, we also analyzed the expression of a number of housekeeping genes to standardize the assays, such as PPIA (peptidylprolyl isomerase A, cyclophilin A), HPRT1 (hypoxanthine phosphoribosyltransferase 1), RPL13A (ribosomal protein L13a), GAPDH (glyceraldehyde-3-phosphate dehydrogenase) and ACTB (actin beta) (Table 1).
The sigA product regulates the transcription of a number of housekeeping genes and is principally involved in cell viability.
We also identify a number of housekeeping and central metabolism genes that seem to have undergone positive selection.
Indeed, the regulation of promoters based around the Sp family binding protein has been observed in a number of housekeeping genes.
Since the original lists of housekeeping genes were mainly extracted at a time when Affymetrix microarrays contained only 7000 human genes (against a total of around 25000 today), it would be expected that the classifier would find a number of new housekeeping genes.
The most abundant 'known' pORF clusters included a large number of housekeeping genes.
The X chromosome contains a large number of housekeeping genes essential for normal cell function and survival.
In line with previous findings by others [34], [52], our data suggest that, in addition to recombination-mediated differences in a large number of housekeeping loci within the core genome, genetic differences among hyperinvasive and non-hyperinvasive CCs likely comprise also different repertoires and allelic profiles of RTX toxin- and TPS protein-encoding genes (Table 2 and Table S4).
Investigation using 16S rRNA segments and in silico multilocus sequence typing (MLST) based on a small number of housekeeping genes [10] led to more scattered results.
