Omar Farhan Ammar

10 Questions 18 Answers 0 Followers

Questions related from Omar Farhan Ammar

Why FCCP does not cause mitochondrial membrane depolarization?

I'm using JC-1 to measure the mitochondrial membrane potential by laser confocal microscopy. I used 100uM of FCCP as a positive control. Surprisingly, it caused lower green to red ratio and was...

23 July 2018 7,517 4 View

Any evidence showing human eggs undergo stress in vitro?

Well, we read a lot about how in vitro manipulation of oocytes can induce stress and therefore reduce their potential or as people call it "quality". I've been looking into the studies mostly,...

13 May 2018 4,252 3 View

Why negatively charged silver nanoparticles have shown greater anti-biofilm activity against S. aureus biofilms compared to P. aeruginosa?

Is it related to the charge of S. aureus biofilm which has weak negative charges due to the presence of D-alanine esters in their teichoic acids? Both S. aureus and P. aeruginosa strains were...

16 August 2017 5,326 1 View

Intensity-Volume-Number: Which size is correct?

Currently, I am using Malvern zetasizer to determine my particles size. I got two different peaks and z- average in the Intensity and Volume distribution modes! Which one should I consider? By the...

14 April 2017 6,763 7 View

What is the best solvent to disperse zincoxide nanopartices for antibacterial activity?

DMSO or deionized water?

31 March 2017 7,022 2 View

Do I take the average size or the peak with the highest concentration in DLS (particle size analyzer) measurement for colloidal silver nanoparticles?

Currently I am synthesizing AgNPs from bacteria. I did the DLS analysis and zeta potential measurement. The most predominant size in my sample was 118 nm and the average around 60 nm. The Zeta...

18 January 2017 159 8 View

By which mean I can increase the temperature of the AgNO3, bacterial supernatant mixture?

I do not have microwave reactor (100W 2.45 GHz ) in the lab. So, any alternatives please?

19 December 2016 6,793 1 View

Why I got silver nanoparticles with different sizes and geometries?

I used Enterobacter aerogenes for the extracellular synthesis of AgNPs. After adding the bacterial supernatent to the AgNO3 I exposured the mixture to the heat for short periods 15 seconds three...

08 December 2016 7,072 3 View

I am wondering if any of these graphs indicate any silver nanoparticle synthesis?

Please are these peaks make any sense?

14 November 2016 8,248 9 View

What is the best concentration and volume of PVP to use it as a capping agent in silver nanoparticles biosynthesis?

My reaction consist of 50ml of 1mM AgNO3 mixed with 10 ml of the bacterial supernatant, now I want to add PVP to prevent agglomeration and increase the zeta potential.

01 January 1970 8,966 4 View