Are there major issues with using tetrahydrofuran as a solvent in cell viability assays?

I want to test curcumin and sulforaphane in cell viability assays. I am planning to use tetrahydrofuran (THF) as vehicle for two reasons: 1) I have verified that these compounds are well...

04 January 2019 138 1 View

What papers or manuals do you recommend the most to be up to date on PLS-SEM?

Dear mates: I have read some papers and manuals on Structural Equation Modeling (SEM), specifically, PLS-SEM technique. I am interested in those papers that highlight the latest approaches or...

05 June 2018 9,197 12 View

What do you know about interculturality and science teaching?

In the most of the countries, teachers teach about science, art, humanities, social, technology, etc. All they are "western" knowledge. However, in few countries teaching about other kinds of...

03 April 2018 3,486 6 View

Why is it important to teach at school the knowledge and practices of other different cultures to the western knowledge?

In the most of the countries, teachers teach about science, art, humanities, social, technology, etc. All they are "western" knowledge. However, in few countries teaching about other kinds of...

02 March 2018 3,023 0 View

Problem confirming discriminant validity (SmartPLS). Could you help me?

14 September 2016 4,923 9 View

Multicollinearity issues: is a value less than 10 acceptable for VIF?

Hello mates Some papers argue that a VIF

08 September 2016 4,183 48 View

Problem confirming discriminant validity (SmartPLS). Could you help me?

08 September 2016 1,796 10 View

Can someone tell me how to reduce the precipitate (particles) of hematoxylin and eosin staining in histological sections?

There is much precipitate (particles) of hematoxylin and eosin in histological sections and we can not distinguish well the structure of epithelial cells. Staining was carried out automatically on...

24 February 2016 4,339 11 View

What is the project about?

Hello. I am Julio form Colombia. I am interested on your project. I have some papers about the same topic. My papers are written in Spanish and some of them are in brazilian journals. I think we...

01 January 1970 2,312 3 View

Is it an open project?

Dear Professor I am Julio from Colombia. I am doing my PhD in Germany about teachers education on intercultural teaching of chemistry. That is why I am interested in your proyect and...

01 January 1970 443 0 View

Physics: Why do we describe light by referring to its wavelength, but microwaves and radar pulses by referring to their frequency?

In physics, the description of the properties of light generally refers to its wavelength (nm), while in the range of microwaves and radio waves we refer to the frequency of a signal (e.g. kHz or...

03 March 2021 1,682 3 View

Is there any effect of different colours of light (white, red, yellow, blue etc.) on the rate of photosynthesis? If yes, why?

Light is inevitable for the process of photosynthesis reaction. Naturally sunlight plays the vital role for this process. Light may be of different colours like white, red, yellow, blue etc....

02 March 2021 7,890 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

In an eye with Tyndall, does each dot correspond to an individual cell?

When you observe the presence of Tyndall in an inflamed eye: Does each of the small floating dots correspond to an individual cell or to an aggregate of cells? Does a conventional slit lamp have...

27 February 2021 6,326 2 View

Necessary tube lenght to cool Natural gas in a dry-ice cooling bath?

I have a tank which contains natural gas at 250 Bar and 293 Kelvin. I want to cool the gas in a dry-ice cooling bath to about 195 Kelvin. The gas will flow in a copper-tube through the bath with a...

27 February 2021 8,128 1 View

Exit velocity of natural gas from pressurized tank?

Hi Guys. I'm a mechanical engineer and have a bit trouble, would be very glad if you could help me with my questions. I have a pressurized tank which contains Natural Gas at 200 Bar and 293...

26 February 2021 6,253 3 View

Gas sensor response and recovery time independant of flow rate and chamber volume?

I am trying to obtain the response and recovery times for my gas sensor device. It appears the the response/recovery times are primarily dependant on the flow rate of the gas I inject into the...

26 February 2021 1,511 3 View

Why do a weight decrease for thermal degradation in nitrogen gas condition?

Hi all The question is related to TGA(Thermogravimetric analysis). Thermal degradation easily understood but why do samples weight decrease? altough just binding is broked, the weight of...

26 February 2021 1,100 5 View

Why do the air flow results vary totally when adding scalar in CFD ?

Dear All, We are using Autodesk cfd to calculate the air flow in a single sided naturally ventilated room, where air flow depends only on buoyancy due to temperature difference between inside and...

25 February 2021 9,602 4 View

How can I obtain time series data by country on night-time light (brightness) ?

Hi everyone, Please, how can I obtain time series data by country on night-time light (brightness) ? I've tried, but so far all I can find are maps. I am looking for numerical data, especially in...

24 February 2021 8,625 4 View