The phrase "amount of dna present" is correct and usable in written English.
It can be used in scientific contexts, particularly in genetics or molecular biology, to refer to the quantity of DNA in a sample.
Example: "The amount of DNA present in the sample was sufficient for accurate analysis."
Alternatives: "quantity of DNA present" or "level of DNA present".
Scientists then use a color-coded system to determine the amount of DNA present, remove less than one billionth of a gram of DNA, and use a technique known as polymerase chain reaction to produce more purified DNA.
The optical density (OD) reflects the amount of DNA present and was measured at excitation and emission wavelengths of 260 and 280 nm, respectively.
Quantitative real-time PCR assays are extremely sensitive and have the advantages over standard PCR assays that they do not require post-reaction processing to visualise PCR products and can quantify the amount of DNA present in a sample.
The LAMP was sensitive enough to detect 0.02 pg and 0.2 pg genomic DNA of Babesia sp. BQ1 (Lintan) and Babesia sp. Xinjiang-2005, respectively, from 10-fold serially diluted samples corresponding to the amount of DNA present in 50 μl of 0.000002% and 0.00002% parasitemic erythrocytes.
The amount of DNA present per seed closely follows an exponential curve with a half-life of approximately 350 years.
Total E4 copies per sample were normalized with the amount of DNA present in each sample and reported as E4 copies/ng of DNA.
This paper demonstrates a new method for electrochemical detection of specific sequences of DNA present in trace amounts in serum or blood.
The failure may be attributed to the following: the presence of PCR inhibitors in the feces, the small amount of cysts, the small amount of target DNA present in the samples, and the association of these factors with the low efficiency of the DNA extraction process [ 16– 16].
Preliminary studies by other groups have found performance of buccal swab DNA on Illumina's Infinium canine array to be modest, suggesting the total amount of canine DNA present in WGA buccal samples is insufficient for high-quality data production for use in GWAS (MW Neff, personal communication).
They currently represent 1.24% of the sequenced genome, but this corresponds to only half of the amount of retrotransposon DNA present at the time of insertion.
Mutations in rep in E. coli resulted in severe growth defects and a near-doubling of the amount of chromosomal DNA present within each cell (Trun 2003).
