How can I find % of Au and Ag in an old sculpture with its alloy?

How can we find the % of gold in a vessel with out damaging the item? Also how can we extract the metals like Ag or Au from its alloys?

11 December 2015 7,832 9 View

How can I perform pechmann condenzation sulfuric acid catalysed resorcinol with ethyl acetoacetate?

Do you have a detail procedure? When I tried the same I obtained a black sticky solution?

02 March 2015 8,958 6 View

Can someone advise on ketone reduction-williamson esterification?

I have to do ketone reduction to alcohol with NaBH4. After this the alcohol obtained is to be reacted with ethyl bromide and NaH. Is it necessary to remove excess NaBH4 and neutralize before going...

04 May 2014 7,263 5 View

What is the best method for isolating high purity eucalyptol from eucalyptus oil?

What is the best method for isolating high purity eucalyptol from eucalyptus oil? Please provide references, if any. I have heard of distillation with cresols; is it worth it to get purity and...

02 March 2014 2,423 5 View

What is the best reaction condition and preferred solvent for Williamson etherification reaction using sodium hydride?

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01 February 2014 3,482 9 View

Which essential oils contain p-menthatriene as one of the major components?

Other than parsley leaf oil.

31 December 2013 3,995 5 View

How to remove a titanium catalyst after esterification reaction?

How we can remove a titanium catalyst after esterification reaction? Adding water gave a white gel of titanium hydroxide which is very difficult to remove. Is there any way to remove this ppt? Or...

11 December 2013 3,100 11 View

How can the chemical structure (in the attached document) be synthesized?

How can the chemical structure (in the attached document) be synthesized?

08 September 2013 8,908 2 View

Citral isolation - can anyone help?

Is there any method available other than bisulphite adduct route for quantitative extraction of citral from lemon grass oil? Bisulphite adduct route gives low yield on regeneration of citral.

08 September 2013 9,163 2 View

Esterification conditions?

What is the simplest experimental condition and setup to conduct esterification of 3-heptenol with benzoic acid? How we can attain high conversion and selectivity?

07 August 2013 1,550 14 View

What are the most reliable approaches to extract key continuous frames from a video, with complete automation?

I have an input video, of skin (from a microscope that means it is magnified such that blood capillaries are visible). The idea is to extract 15 sec of continuous frames from a video of 1 min,...

02 March 2021 2,735 2 View

Which is the best place in the world for the plant biotechnology research?

I am searching for a good place for the Post Doc,

02 March 2021 4,053 3 View

How can extract ciprofloxacin hydrochloride disolve in water er to organic solvent such as dichloromethan or any other solvent?

I need a procedure to extract the ciprofloxacin hydrochloride from aqueous solution by using dichloromethane in detail,. I thank you very much.

01 March 2021 4,306 1 View

Which bacteria are suitable for quorum sensing screening?

I want to find a quorum sensing inhibitor from plant extracts. Klebsiella pneumoniae, Moraxella catarrhalis, Staphylococcus aureus, and Streptococcus pneumoniae. I looked for these strains...

01 March 2021 7,675 3 View

Isolates of Hymenoscyphus fraxineus?

Dear Dr. Cai, my name is Simone Prospero and I work in the team of Phytopathology at the Swiss Federal Institute for Forest Snow and Landscape Research (WSL;...

01 March 2021 1,133 1 View

How to perform statistical analysis of coefficients extracted from transform techniques?

I am studying the potential of DCT and FFT coefficients extracted from a signal to classify the different objects that emit the signal. I applied the Shapiro-Wilk to confirm that data was not...

01 March 2021 8,079 2 View

Where to find data on trees in tropical agroforestry?

Hi, I'm looking for data (mainly related to management: growth rate, canopy size, soil and climate preferences, etc.) about tropical trees used in tropical agroforestry. Have you ever heard about...

28 February 2021 7,356 8 View

How to remove fatty material from plant extract?

The resultant solid was partitioned three times with 250 ml of petroleum ether (40-60/c) to remove any fatty material and evaporated to dryness.

28 February 2021 9,464 2 View

Can water be extracted from Olivine?

I have always been interested in geology and wondered about how unique structures of materials behave in different circumstances. I stumbled upon Olivine, the magnesium iron silicate, and heard...

28 February 2021 7,330 4 View

How to make fractions of chloroform extract of plant, using seperating funnel?

28 February 2021 8,466 2 View