J.D. Franco-Navarro

12 Questions 106 Answers 0 Followers

Questions related from J.D. Franco-Navarro

Is it correct to immerse the phmeter sensor in a cosmetic cream, oil, or thick balm?

I am having a discussion with some lab colleagues who intend to dip the phmeter head in cosmetic cream, oils, and balms with oil and beeswax. I tell them that they will clog the semi-permeable...

29 July 2021 6,638 2 View

How can I get Agrobacterium tumefaciens EHA105 for citrus transformation?

In 2016-2017 I was working with a strain of Agrobacterium tumefaciens, called EHA105 (agropine-type), that a guy from a lab in Portugal kindly sent me by mail, but the strain carried an incredibly...

15 March 2021 6,445 6 View

My Xenopus oocytes (healthy frogs) explode before I can make any electrophysiological records, why?

Xenopus laevis oocytes are used in electrophysiology to make transient expression of injected mRNA fragments. Through the technique of 2-electrodes voltage-clamp we can record the physiological...

12 January 2021 6,177 4 View

Anybody know how to measure electrical parameters on skin?

We want to do a test on skin using different cosmetics and I would like to know if there is any electronic equipment that determines the thickness of the skin or the percentage of fat and water...

31 May 2020 8,477 2 View

Strange metabolite pattern in plants subjected to drought... what does this mess means?

Tobacco plants were subjected to 3 different nutritional treatments (A, B, C) for 3 weeks, and also were treated under two irrigation regimes during 2 weeks (Well-watered plants or Control plants,...

02 October 2019 5,022 14 View

Might a concentration of 5 mM fosfate precipitate iron?

It is known that phosphate at certain concentrations can precipitate iron, and now I'm planning a trial having a final concentration of 5 mM of phosphate and a final pH of 5.7. The final...

07 October 2016 1,656 3 View

How can I determinate the stomatal aperture degree in epidermal peelings?

Stomatal aperture assays in abaxial epidermal peelings of tobacco leaves were done as described in Allen et al. (1999) and He et al. (2013). Peelings were induced to close all stomata in dark...

03 October 2016 1,582 4 View

Seedlings and ozone. Foe or friend?

In seedlings it is important to verify that ozone does not cause damage, because plants are more sensitive to ozone in juvenile stages (Timonen et al., 2004). Ozone, applied diluted in water and...

01 January 1970 6,822 2 View

Does all the nitrogen present in an irrigation water (in its organic or inorganic forms) become nitrate after ozonation of the water?

This is the scenario: 1) Irrigation water with a composition of ferric nitrate [Fe(NO3)3], ammonium nitrate [NH4NO3], ammonium nitrite [NH4NO2], ammonium nitride [(NH4)3N] and humic acid (full of...

01 January 1970 5,760 4 View

Blood markers related to covid-positive

There are many immunological and PCR research about COVID-19, but I wonder if there are a relationship among COVID-positive and any blood parameter. There is information that put the target on...

01 January 1970 9,402 10 View

What can happen to a vegetable oil bubbled with nitrogen gas for a long period?

I wonder what can happen to a vegetable oil (for example, olive oil or sunflower oil), if instead of bubbling it with a source rich in oxygen (for example 10% nitrogen : 90% oxygen), we bubble it...

01 January 1970 9,144 7 View

Should all non-native species continue to be considered invasive species when they have been established in a country for more than a century?

The problem of the concept of INVASIVE EXOTIC SPECIES is in those species considered as such, which either do not have an invasive growth and propagation behaviour, or they are so naturalized and...

01 January 1970 7,816 33 View