Pyrenees - Science topic

I detected some data about the presence of holm oak (Quercus ilex L.) in Andorra but I don't know if the information is reliable. Also anyone know examples of holm oaks in mountains? At what altitude?

Thanks in advance!

Hi, Jeannette. As I collected live samples for your proyect at Asturias and Cantabria, I want to know if the scope 'Pyrynees' means strictly this mountain range, for that Asturias and Cantabria are several hundred kilometers westward. Thanks and best regards.

Dear Colleagues,

I need some help in the identification of these fungal ascospores evidenced in a sediment originating from the "Caune Arago" cave (eastern Pyrenees, France) and dated to 400 000 years ago approximately. There are 2 types: Tauta 12 and Tauta 14. Please see attached files.

I really thank you for your help.

Best regards,

Yannick

The photoexcited hydrogen bonded complex molecule shows low radiative rate constant as compared to its luminescent COF part. The S1 hydrogen bond is strengthened. The MOs analysis demonstrated that the electron density distribution was mainly located on formaldehyde (guest molecule) in LUMO while the HOMO showing the distribution on pyrene unit of the COF. All other parameters also in support of quenching process but I couldn’t able to illustrate the specific deactivation pathway for this noncovalently bonded complex molecule. Can anyone will guide me, please?

need a complete methodology and experimental procedure....

I have a 50-50 mixture of a gemini surfactant and Tween 80 , I have not been able to determine the number of aggregation fluorescence , pyrene and CTB with no quencher and 9 -methyl anthracene and ruthenium either, how could I do?

Hello,

I need to synthesize an alkyl-substituted pyrene. i Would like to substitute a 14 carbon alkyl chain to pyrene. I am planning the following synthesis route:

Step 1. Friedel crafts acylation of pyrene using Tetradecanoyl chloride (CH3(CH2)12COCl) in presence of AlCl3

Step2. Clemmensen Reduction of the carbonyl group to achieve the alkyl substituted pyrene.

1. Could you please comment on the feasibility of this chemical reaction?

2. If the reaction is feasible, what should be the necessary reaction conditions (Temperatures and any other reagents, if any) ?

Thanks in advance.

Hello,

I would like to synthesize an oil soluble pyrene derivative which preferably contains one or two long hydrocarbon chain attached to it. The preferred length of chain is typically 14-18 carbon atoms.

Could you please suggest me the feasibility of such a chemical compound and its synthesis route.

Thanks in advance!

Is it possible to determine the pyrene from aquious media in the concentration range of 10 microgram/L-100 microgram/L using UV-VIS spectrophotometer?

I found 12 of these in my net, all with a very similar shape and quite hard.

The 2 pictures shows the two sides of the animal (?)

Thank you for your help.

Is it normal to get fluorescence when I try to analyse my polymer grafted with pyrene by RAMAN? (We are getting a big fluorescence "contamination" when we try to analyse our polymer).

Hello,

I need a GIS map of the LGM for all European mountains (Sierra Nevada, Pyrenees, Massif Central, Alps, Apennines and Carpathians) that display the maximum extension of glaciers, if possible at 1-5Km resolution.

Any idea where I can find it?

Thanks

I am pursing spectroscopic methods because I need either a non-destructive technique and/or high throughput,so I want to  use the instrument of near infrared spectroscopy or fluorescence spectroscopy to measure PAHS in water.But I'm not sure whether it is feasible to do so.

Because of low solubility of PAHs in water, how to do the qualitative and quantitative analysis of the PAHS in water by using the instrument of near infrared spectroscopy or fluorescence spectroscopy? By using the instrument of near infrared spectroscopy or fluorescence spectroscopy,to measure PAHS in water is more difficult than in soil?

A purity of 99% of anthracene, fluoranthene, pyrene, phenanthrene PAHS powderertor need to be diluted to low concentrations.

Because of carcinogenic polycyclic aromatic hydrocarbons，if operator,wearing masks and gloves,do experiments of about PAHS in a fume hood,is it great possibility that the operator is more seriously contaminated by PAHs in laboratory environment than in everyday living environment ,such as smoking, air haze, etc.? Do anthracene, fluoranthene, pyrene and phenanthrene have more

carcinogenicity ?

Thanks very much

What is the reason for this quenching ?

I am having problem on diluting benzo[a]pyrene (BaP) with culture medium. My BaP came in powder form and it could be dissolved in DMSO very well, but it precipitated out when I dilute the BaP with culture medium.

Could anyone share their experiences on avoiding the precipitation? Thanks.