I changed the H-ESI needle on TSQ Quantis Mass Spectrometer and found the ion spray current turned down to zero. It was around 31 uA before the change. Does anyone know what caused this issue and how to fix it? Thanks!!!
Dear peer scientists, Ultradry storage is not suitable for recalcitrant seeds. However, theoretically, if we can stabilize the structure of the subcellular membrane, as well as glassify the...
25 February 2021 2,442 1 View
24 February 2021 3,348 2 View
23 February 2021 7,826 2 View
23 February 2021 4,014 3 View
Hello, I was wondering the best way to build an orthogonal box filled with a defined crystal structure in ASE. I know it could be easily done in LAMMPS, but I guess it is also doable in ASE. The...
21 February 2021 5,899 4 View
I am trying to in vitro transcribe some fluorescein labeled ssRNA. And I want to purify the ssRNA from the free NTPs and the enzymes (RNA polymerase and DNase I). Due to the characteristic of the...
18 February 2021 4,392 4 View
I can find several papers that give me a guide for choosing a suitable aptamer sequence 1. But how to find a property aptamer sequence 2(partially complementary to sequence 1)?
09 February 2021 3,511 1 View
Do anyone have a full MATLAB code for structural topology optimization using Genetic Algorithm? Such as a cantilever beam? Could you provide some MATLAB code to me , a beginner for GA. Thank...
03 February 2021 3,789 5 View
Hi Everyone: I have a question regarding to qPCR. I am trying to do RT-PCR, and I want to have equal amount of input DNA for my RT-PCR, so I normalize my DNA input based on qPCR values of a...
31 January 2021 6,977 4 View
Hi Everyone: I want to quantify the relative amount of a protein in 2 samples. I will first digest the sample with trypsin, and subject the resulting peptides to LC-MS/MS analysis. I will then...
25 January 2021 8,333 3 View
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 am using a 2707 waters HPLC device. When I try to inject a sample, it says missing plate or rack. I changed the needle and calibrated its position but I still get the same problem. I even get...
02 March 2021 1,408 1 View
How do I do energy minimization in lammps with NVT ensemble ? I am using the following command and it does not seem to work. It stops at extremely high energy and gives me the error zero search...
01 March 2021 2,294 3 View
Hi there! I regularly receive suggestion about papers and authors that are totally out of my area. Does anybody know how I can fix this? Thank you!
01 March 2021 9,574 4 View
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
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
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
Are there any differences (outside of the clinical trials that led to their EUA) observed in the rate of infection among those who have received the Pfizer vs Moderna vaccine since the mass...
22 February 2021 9,727 6 View
i have frequencies of bridge that are effected by mass of vehicle. the problem is when any vehicle pass the bridge it would add the its mass to the bridge mass ultimately mass of the bridge will...
22 February 2021 10,004 3 View
I have a fixed sample and would like to use the murexide reaction to test for uric acid composition. I no longer have fresh samples
22 February 2021 1,328 1 View