Cloudy or "milky" surface of soft (Ag, Al, etc) single crystals. How to avoid?

Hi all, sorry for double-posting, but the "discussion topic" doesn't seem to get enough attention. We have recently started to work with Al single crystals for surface science experiments....

30 July 2020 2,603 3 View

Abaqus high stresses?

Hello , Recently I received a strange effect: stresses in the outcome are higher, then those specified by Plastic material performance, i.e. there was specified 180MPa, while in the odb frame I...

02 July 2020 4,118 4 View

Humic acids degradation by microorganisms?

Is there any new info on microbial degradation of humic acids in or out of soil?

07 March 2018 1,087 2 View

Inflamation by dead cells?

If dead cells of microorganisms forming a biofilm on a stent, accumulate due to actions of antimicrobials, could they provoke inflamation?

27 February 2018 8,671 3 View

How to immobilize lactic acid producing bacteria on the surface of medical devices?

Do you know some cheap hydrogel to cover the surface of medical devices?

25 February 2018 8,916 2 View

How to make small FOV collimator?

I have a sensor and I want to make really small FOV, like 0.1 degree.So, I use lens, which focus light into pinhole. So FOV is Tan(D/f)^-1, where D is pinhole size, f is focal length. It means, If...

18 September 2017 3,889 3 View

Is it possible to predict UV-VIS absorption spectra of polyconjugated polymers?

Hi, and thanks for taking a look. There are well-known Woodward-Fieser rules that allow predicting the absorption peak locations in diene compounds that may have unsaturated substituents attached...

07 June 2017 9,188 2 View

Has anyone else experienced this problem with Omicron (Focus) EFM 3/4 evaporator?

I would like to deposit iron from the commercial e-beam evaporator, in UHV, but I can get no emission current, fhile flux monitor shows negative flux in the range of nA. I would guess, this is the...

06 March 2014 5,862 9 View

Can somebody help me find reasonably simple software for calculations of magnetic exchange between paramagnetic metallic centers in complexes?

I am new to this area and we are having more and more of these kind of compounds. Any help will be highly appreciated.

27 November 2013 1,901 2 View

What do you think are the most effective measures to suport the economic activity in the COVID-19 environment?

What is your opinion about the effectiveness and efficiency of economic measures taken in the times of that specific crisis? Why do you think measures taken in your country gave a positive (or...

01 January 1970 4,149 21 View

How do I increase the yield of my PCR product?

Hello, We would like to increase the yield of our PCR product. We are running a series of PCR reactions that is targeting ~1.1kb sequence. We begin each reaction with ~400pg of template DNA...

02 March 2021 4,029 3 View

Why are my bands weird in this Agarose gel?

Can someone please give me some possible things that could go wrong? Here is my recipe: 0.5g Agarose 50 mL of TAE 1x 1 uL ethyl bromide. Gel was run at 100V for 1 hour. The buffer used is also TAE.

01 March 2021 9,952 3 View

Precipitate after adding laemmli buffer to protein solution containing Potassium Acetate?

Hi, I am running a size exclusion chromatography experiment with a buffer containing Potassium Acetate as a salt. I analyse these fractions through SDS-PAGE. After boiling my SEC fractions in...

01 March 2021 2,622 3 View

1 nm thick MgO thin-film to be deposited on Si wafer using thermal evaporation. What will be the optimum deposition conditions?

Favourable conditions of base pressure, rate of deposition. Also, by which characterisation technique to be used to verify the thickness of the deposited film.

28 February 2021 3,640 3 View

What is the best etching method for Mg-Ca alloy?

I have used Picral etchant (4.2 g Picric acid, 10 mL Acetic acid, 70 mL Ethanol, 10 mL distilled water) but it didn't work. Is there any alternative?

21 February 2021 2,558 5 View

How to prepare electrolyte of NaClO4 salt for Na-ion battery? Any problem with this salt?

Hello, I am trying to make anode for Na-ion batteries. I have no experience with preparation of the electrolyte for any batteries. NaClO4 salt are available and I am planning to use EC:PC as...

21 February 2021 8,132 1 View

I want to remove TiO2 and SiO2 coating from surface. any one can help me?

I want to remove TiO2 and SiO2 coating from surface. I think that i should use HCl and MgCl2 and an oxidation agent such as potassium nitrate, but i dont know in which propertion should these...

14 February 2021 300 3 View

By which mechanism does potassium hyrdoxide works as an activator in the preparation of activated carbon?

Activated carbon is prepared from biomass using KOH as the activating agent. What is the possible reaction between KOH and the biomass?

14 February 2021 8,095 4 View

Does any one have experience with Autoclavable cell culture media (RPMI 1640/DMEM)? Does it work well?

12 February 2021 2,958 1 View

How to determinate of molecular structure of salt into the liquid?

I need to determine the open formula of our complex, presumably consisting of sodium tungstate Na2WO4 and aluminum sulfate Al2 (SO4) 3. Our problem is that with an increase in the concentration...

11 February 2021 5,821 1 View