What is the difference between nanofiltration and reverse osmosis membranes?

06 July 2016 6,572 3 View

Your help will be highly appreciated for solving the problem in the attached file ?

This is to determine the inverse of a Laplace transform

06 July 2016 3,415 0 View

What are the causes of climate changes?

In the history of the Earth, climates have evolved depending on natural phenomena more or less cyclical. What do you think ?

06 July 2016 673 7 View

Does Life exist in polluted water?

Pollution of an aquatic system is characterized by the change in the initial population structure

06 July 2016 10,007 5 View

What are the "ecological disaster" caused by man?

These are triggered abruptly imbalances in the natural environment, large-scale, with serious consequences in the short and long term on the environment.

06 July 2016 8,253 6 View

What is the most appropriate disinfection process to inactivate or destroy pathogenic microorganisms in water systems?

06 July 2016 3,451 4 View

How long can we keep spring water at room temperature without any danger?

Lifetime of spring water

06 July 2016 8,205 6 View

The current desert areas, have they always been?

Can we make a connection with climate change?

06 July 2016 7,697 3 View

Is the drinking water (Tap) more ecological than mineral water?

Comparing drinking water to mineral water is not a new idea, but so far there have been few studies to directly compare drinking water and mineral water by taking into account all factors primary...

06 July 2016 8,462 26 View

Is life possible without water?

there are life forms slowed and dried such as seeds or spores.

06 July 2016 4,192 3 View

Chlorinated organic formation in odor control scrubbers using hypochlorite?

I'm involved in a study of odor control technologies for municipal wastewater treatment plant. One of the control options involves a chemical 2-stage (acid/alkaline) packed bed scrubber. The...

03 March 2021 3,661 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

Ester cleavage conditions?

Hi all, I need to cleave the ester in Ethyl 2-amino-1H-imidazole-5-carboxylate to make the carboxylic acid and retrieve the product from solution to use in downstream applications of linking to...

01 March 2021 8,766 3 View

How to remove DCU and HOBT from my reaction?

I am doing a acid and a chiral amino alcohol reaction using DCC and HOBT in DCM or THF? Can anyone suggest me how to remove DCU and HOBT from a reaction mixture??

28 February 2021 2,153 1 View

What is the most common number of epitopes in an multi-epitope Vaccine?

hi everyone, I'm interested in the field of vaccine design specifically multi-epitope cancer vaccines , I want to know if there is a minimum and maximum number of epitopes we could use in a...

27 February 2021 3,882 3 View

How to increase solubility of Poly acrylic acid in Dioxane solvent?

I am working with Polyacrylic acid (100.000Da) and instead of water, I need to use another solvent (dioxane) to dissolve PAA. However, because of the high molecular weight, it's quite hard to...

25 February 2021 2,225 5 View

Why is NH4OH added in heavy metals limit test?

The limit test I'm referring to is USP method II. In this procedure you need to dropwise add 6N of NH4OH to the sample until it the pH is alkali. After that you need to dilute and add HOAc until...

23 February 2021 2,049 3 View

Is it efficient to do liquid biopsy to investigate the gene expressions of the tumor?

To do liquid biopsy and look for specific gene expressions there are so many published papers. Thera are different protocols and procedures used to isolate circulating cell free RNA or mRNA from...

23 February 2021 7,326 5 View

Is this the write procedure for acid digestion of soil for heavy metal analysis using AAS?

How to do acid digestion of soil sample with 3:1 aquaregia in an open vessel?

23 February 2021 3,053 7 View

What is the biochemistry of acidic solvents for phenolics extraction in strawberry?

I am using the Folin-Ciocalteu method for analysis of total phenolic content in ripe strawberries. I've read several protocol that suggest a methanol/H2O/formic acid (80:19:1) extraction solution....

22 February 2021 6,560 3 View