What to do with this Gaussian Convergence error?

Hi! I'm kind of a beginner with computational chemistry and I\m trying to study the interaction between copper ion and a graphitic carbon nitride quantum dot. the calculation converges with HF but...

02 January 2021 8,684 5 View

How can I fix the connvergence error!?

opt freq gaussian calculation is performed, I got normal termination , however, the structure has nottotaly converged. because I had no convergence in Maximum Displacement! how can I solve this...

06 September 2020 4,283 3 View

Protocol for extraction of antibiotic from plants?

hi all, please can anyone knows a protocol for measuring antibiotic concentration in plant samples through HPLC technique? i need the detailed protocol, with the used reagents. i made in a...

18 August 2020 3,370 3 View

Is there any formula to calculate effective sample size to calculate different blood parameters in chickens at different flock size?

Is there any formula to calculate effective sample size to calculate different blood parameters in chickens at different flock size?

16 January 2019 3,997 1 View

Hay every body: Where I can found FREE ACCESS to Hourly Measured Solar Radiation Data For North Africa Countries?

Hourly Global horizontal solar irradiance Hourly Diffuse horizontal solar irradiance and Hourly Global tilted solar irradiance

17 August 2018 8,692 13 View

To be more accurate, the electronic absorptions of a compound in UV-Vis spectra should be called peaks or bands?

During assignment of the electronic absorptions for a specific compound, to be more accurate, I am wondering what do we name those absorptions; bands or peaks? I am asking this question because I...

05 February 2018 5,810 4 View

To be more accurate, the electronic absorptions of a compound in UV-Vis spectra should be called peaks or bands?

During assignment of the electronic absorptions for a specific compound, to be more accurate, I am wondering what do we name those absorptions; bands or peaks? I am asking this question because I...

05 February 2018 2,709 3 View

I am wondering what is the difference between the words PEAK and BAND in spectroscopy?

Please I am looking for definite differences between peak and band in spectroscopy since I noticed that researchers use these two words alternatively in for example FT-IR, UV-Vis, and other...

05 February 2018 8,039 14 View

I am wondering, Have you used BigDFT software in your quantum calculations for nanomaterials?

Is it a reliable program for our scientific research? Thank you in advance.

30 December 2017 1,847 4 View

Excuse me, What are the best reaction conditions for the reaction between chitosan and glutaraldehyde?

What are the recommended pH, solvent(s), concentrations, reaction temperature, and reaction time? In the literature, there are different reaction conditions. Therefore, if please you have...

19 December 2017 5,432 11 View

Buffer Exchange using column packed with sephadex G-25 effect on protein concentration?

Hello, If i am doing a buffer exchange for an antibody of 1mg/mL, does the elution lose protein in the process of buffer exchange? For example, if i flow through 500 uL of 1mg/mL sample, and...

03 March 2021 6,299 3 View

No title

03 March 2021 5,360 2 View

What solvent can I used for Paal Knorr reaction between 6-amino hexanoic acid and 2.5 hexanedione?

I am try to make the Paal Knorr reaction between 2.5 hexnedione and 6-amino hexanoic acid, my problem is type of solvent to use, because 6-hexaminohexanoic acid is soluble in water but I am not...

02 March 2021 4,443 2 View

Waters 2707 HPLC autosampler problem?

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 optimize the Size Exclusion Chromatography?

Hello! I'll do a size exclusion chromatography, but I only have an open column, and I'll perform the peptide extraction from yeast, using buffer lysis (sodium phosphate 50 mM/NaCl 30 mM/DNAse and...

01 March 2021 2,215 2 View

How to quantify carbon deposition on CuZnAl catalyst?

Dear All, I want to quantify carbon deposition on the surface of the CuZnAl catalyst. I have tried thermogravimetric analysis, but I've got weight gain as the active Cu- get oxidised. Does anyone...

01 March 2021 1,907 3 View

Why Trivalent chromium start precipitating above PH 5 ? Moreover discuss difference between adsorption of chromium and precipitation of chromium ?

I am a student of MS Environmental Engineering and started my research phase. I am working on metal removal ( chromium iii ) by using activated carbon prepared from the agricultural feedstock. So...

01 March 2021 5,475 2 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

Is CD44 degraded in lysosome together with hyaluronan after CD44 mediated endocytosis of hyaluronic acid?

Also when RHAMM binds hyaluronic acid, they get internalized, will RHAMM also be degraded? Or both CD44 and RHAMM will be transferred back to the cell membrane? Asking for breast cancer cell line...

01 March 2021 8,169 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