28 October 2019 3 10K Report

What conditions (temperature, catalysts, etc.) needs 6-Mercaptohexanoic acid to form starting from 1-hexanethiol?

More Silviu Preda's questions See All
Why not use a screened infectious patient as source of all antigens for a vaccine?

At present the patient is used as source for the "seed" antigen, which is subsequently multiplied in cell cultures to obtain all the antigens for a vaccine. Disadvantages are long time of vaccine...

27 August 2020 5,000 0 View

Since outbreaks of influenza in warm climate happen only in the wet season, would reducing air humidity be a method of treatment/prevention?

Due to their small size, viruses were shown to dry and die quickly, especially on porous (hydrophobic) surfaces and in dry environments. Could drying the air be a method of treatment / prevention...

14 February 2020 8,268 2 View

Why did the computer models consider land use (deforestation) as having a negative global warming effect?

It appears that only the effects of the albedo have been considered and not those of the sensible and latent heat. The systems definition is another issue: HOME - abstract

12 February 2020 7,698 5 View

Is the corona-virus a cause or a vector of the disease?

Viruses in different activation stages and different concentrations are always around us. Maybe both the activation stage (the virulence) and the concentration are dependent on environmental...

11 February 2020 9,247 2 View

CIF file for Titanate nanotubes?

Hi, Where can I find a correct crystallography information file (.cif) for titanate nanotubes? I need crystal structure information, as atom fractional coordinates. Thanks!

04 November 2018 4,770 5 View

ZnO X-ray diffractogram question - umbrella effect?

Hello, The diffractogram (enclosed) was measured on ZnO thin films (incident fixed angle 0.3 deg), by asymmetrical reflection measurement. Why the doublet for each reflection appear? This is not...

28 April 2018 7,635 2 View

What is the best software application for automatic segmentation based on CT?

In order to prepare for surgery, we need a fast reconstruction of the 3D model of the internal organs.

04 January 2014 3,222 14 View

How to compute the refractive index of a thin film?

How can one compute the refractive index of a thin film by knowing only the bulk refractive index and the film thickness?

28 December 2013 6,720 24 View

How to determine the highest spatial frequency component of a refractive index profile?

I'm currently using Beam Propagation Method (BPM) to run some EM propagation simulation in waveguides. I was looking at this article : Van Roey et al. - J Opt. Soc. Am. 71 (7), 803 (1981). There...

05 July 2013 4,794 1 View

The problems created by albedo in the energy budgets of climate change modelling.

Albedo plays a central role in the climate change energy budgeting, but its generic use (from the astronomy tradition) creates problems of many kinds. Firstly, even the classic astronomic use...

01 January 1970 8,328 3 View

Similar questions and discussions
Separation of organic acids-HPLC?

Hello What should be done to separate and identify organic acids in HPC when their RetTime is the same?Like oxalic acid with Propanoic Acid.or acids that have a very close RetTime.

07 August 2024 8,782 3 View

Determining the worth of a point improvement in Hamilton Depression Scale?

Dear readers, Thanks for your attention. I am wondering about the health economic problem of quantifying the value of interventions which a) prevent, b) improve symptom profile and c) ultimately...

05 August 2024 3,246 1 View

Need heterogeneous catalysts calcined before reduction?

Metal-containing heterogeneous catalysts often need to be calcined before reduction, so what are some examples of catalysts that perform better without calcination? What is the reason and how many...

05 August 2024 909 2 View

Conjugation of PEG-Amine to an Amino Acid Using EDC?

I am attempting to conjugate PEG to an amino acid at the C-terminus, for the purposes of producing nanoparticles. I have been told that PEG modified with amine groups can be used for this purpose,...

31 July 2024 2,033 1 View

Is it possible to use a safer acid instead of monochloroacetic acid to convert bacterial cellulose to carboxymethyl cellulose?

Hi, researchers, Is it possible to use a safer acid instead of monochloroacetic acid to convert bacterial cellulose to carboxymethyl cellulose?

29 July 2024 4,570 0 View

My cfDNA extraction protocol using silica beads works with plasma collected in COD SAGM bags but not with plasma collected in K2 EDTA tubes. Why so?

I am currently performing cell-free DNA (cfDNA) extraction from plasma using an in-house developed kit that employs silica-coated magnetic beads. My protocol works effectively with plasma obtained...

28 July 2024 3,559 0 View

I have calcined my catalysts without flowing air from the compressed air cylinder will there be any problem with my reaction if i use that catalysts?

FYI Catalyst is MFI zeolite Si/Al = 140,25.40.11.5,15 I am using this catalyst to study methanol to DME conversion

25 July 2024 2,486 2 View

What is the Principle of Cysteine-carbazole-sulfuric acid reaction with glucose?

I have been looking for the principle of Cysteine-carbazole-sulfuric acid reaction in research papers and books, but couldn't find it. This reaction is mainly used for the quantification of...

23 July 2024 3,891 0 View

Can sulfuric acid be used to prepare anthrone reagent when it has oxidized and changed color in reaction to light?

Sulfuric acid has changed color to yellow.

16 July 2024 6,964 0 View

Qiagen circulating nucleic acid kit poor yield?

Hi, Attempted to extract cfDNA from a 4 mL plasma sample, with poor yield. Went through the manual in the section regarding poor yield, and feel that this does not apply. Some potential...

14 July 2024 7,475 1 View

Our partners will collect data and use cookies for ad personalization and measurement. Learn how we and our ad partner Google, collect and use data. Agree & close