Fiber Optic PPR biochemicals detection sensor

[Nithya]

I was reading this journal on FO-PPR sensor and had a doubt. Couldn't exactly google for an answer as it was unclear.
"Integration of fiber optic-particle plasmon resonance biosensor with microfluidic
chip" by a group of scientists.
I have attached the pdf.
Under the section "Preparation of AuNP" , it had (n=500) written in the end. I couldn't figure out what it meant .
I will appreciate it , if you clear my doubt .

Edit by Borek: pdf removed.

 

[Borek]

Under the section "Preparation of AuNP" , it had (n=500) written in the end. I couldn't figure out what it meant

Number of nanoparticles used for size analysis.

I am deleting the attachment, posting it here almost for sure breaks copyright.

 

[Nithya]

Thanks Borek.