What does the resolution of quadrupole mass analyzer depend on?

Hi, I was curious to know what factors affect the resolution of a quadrupole mass analyzer. I find a lot of electrical settings that may affect the mass of the ions that are being transmitted. Is...

17 January 2021 5,724 1 View

What is a relationship between ion transmission and grid in Time-of-Flight Mass Analyzer?

Hi all, My understanding about the grid used in ToF is it is useful to reduce the broadening due to the varied kinetic energy of the ion. But also it may reduce transmission (90% or less). Is...

07 August 2020 9,379 0 View

Why do we lose transmission when increasing the drift length of TOF?

Resolving power of TOF increases with longer drift time (mass/delt(mass) = (t/delt(t) using the kinetic energy ((1/2)*mv^2) and potential energy(z*e*V) ). t is the centroid of drift time. delt(t)...

27 September 2018 9,403 6 View

How do people study oxidation state of metal ions?

How do people study the oxidation state of divalent metal ions? The difference is number of electrons, which are very small in mass. How do people actually study this experimentally?

09 August 2018 7,923 3 View

What is a possible simulation time in conventional computational biology?

01 January 2017 7,808 4 View

How temperature affect plasmid DNA conformation?

I conduct a thermal stability test for plasmid DNA. In which I put plasmid DNA under 65-degree celsius for about one week. After that, I run an agarose gel check. Here below is what I got: 3 left...

25 December 2016 8,754 3 View

Heavy metal binding solutions used for native MS ?

07 July 2016 1,839 2 View

What are the methods for nucleotide ratio quantitation?

Providing that I have a single stranded DNA (short fragment ~30 nt) with unknown sequence. What are the experimental methods which could help to determine nucleotide ratio (percentage of A,T,G,C)...

24 April 2016 7,131 2 View

How to measure adsorption of biomolecules in liquid on solid surface?

07 April 2016 3,870 3 View

What is the problem with my bacterial cell growth in LB media?

14 March 2016 5,711 7 View

Does any one know how i can prepare liver tissue with transmission electron microscope with good fixation?

i have problem in preparation of liver tissue with bad cell organelles and how i can adjust osmolarity

03 March 2021 8,890 1 View

After a reference from Int J Body Compos Res, can any body help?

Hi, I am after the reference below, my library says it cannot obtain a copy either locally or internationally, any help appreciated! Chris Wang ZM, Heshka S, Wielopolski L, Pi-Sunyer FX, Pierson...

03 March 2021 6,193 1 View

I need to image mesoporous silica nanoparticles that are in ~100 nm size and do high resolution TEM to look at mesopores. what grids should I use?

Need to image mesoporous silica nanoparticles using the TEM. Also, need high resolution TEM images to see the mesoporous structure. Kindly suggest what kind of grids to use. Thanks, Shatadru

02 March 2021 1,787 2 View

Shall I skip the measurement model in SmartPLS?

Hello everyone, I had run a mediation model in SmartPLS using questionnaires that were already validated among my statistical population. A professor who edited my paper -though she is not...

01 March 2021 3,052 3 View

Does any one can help me choose a reasonable basis set for intermediate metal ions interactions with guanine (i.e Fe2+, Mn2+, Cu2+ and exc.)?

Hello every body Does any one has any idea to help me choose a reasonable basis set for intermediate metal ions (i.e Fe2+, Mn2+, Cu2+ and exc.) interactions with guanine or other DNA organic...

01 March 2021 6,187 2 View

Any research papers for extraction of nutrient deprivation on macroalgae? Analysed by HPLC-UV and GC/MS. Possibly from macroalgae genus Rhizoclonium?

I am doing my thesis on the nutrient deprivation on the macroalgae Rhizoclonium sp. I will be analysing the levels over a period of roughly 5 days by HPLC-UV and GC/MS. I will be using seawater as...

28 February 2021 6,477 1 View

Benefits of the 24 welled plate?

We have always used the 96 welled plate, the 48 welled plate but apparently there is much evidence on the 24 welled plate and above all its benefits.It states it is the same you would use on ELISA...

28 February 2021 1,149 1 View

Is there any published or unpublished statistics on dropout rate (Dose1 to Dose-2) for Covid-19 vaccination in India, US, UK or any other country?

Are there any published or unpublished statistics or papers on the dropout rate (Dose1 to Dose-2) for Covid-19 vaccination in India, USA, UK, or any other country where vaccination has started at...

28 February 2021 4,237 1 View

SEM or Multiple Regression for an analysis without Latent Variables?

Hello, I have three hypothesis to test, all with the same IV. I am testing if the effect of the IV on the first DV is mediated by awe. I am then measuring whether the effect of the IV on a...

26 February 2021 8,399 5 View

Steps to calculate activation energy by coats & redfern method?

I'm a chemistry student and I'm researching the kinetic degradation of mixed plastic waste. I'm having trouble calculating the activation energy by the coats & Redfern method. The data that...

24 February 2021 974 1 View