What is the biological importance of alkaline phosphatase in milk?

Greetings all As you might know raw milk has an alkaline phosphatase activity, and indeed this activity is used for pasteurization quality control. The question I am wondering about is, what is...

05 June 2019 4,434 1 View

Extraction of Heme A, Heme B and Heme O?

Greetings I am looking for a trusted protocol for extraction of Heme A, Heme B and Heme O, to be used as standards in HPLC analysis. Alternatively if you know of a commercial source also...

04 May 2019 5,446 2 View

Plasmid for constitutive expression of gfp in Bacillus subtilis?

Greetings Does anyone have , and is willing to sent me, a plasmid suitable for constitutive expression of gfp in Bacillus subtilis? Many thanks Yoram

03 April 2019 1,471 1 View

What are the carbon 'species' in traeted wastewater? A good model compound for such?

Greetings all As wastewater get biologically treated carbon is removed, but obviously not all carbon species are removed, since some are more easily consumed by the bacteria doing the treatment....

10 November 2018 6,225 2 View

Origin of 220nm absorbance peak of free amino acids?

Greetings I am trying to find out what is the origin of the 220nm absorbance peak of free amino acids? It is usually attributed to peptide bond but I find it also in single aa... Yoram

05 June 2018 6,591 3 View

Why do particles concentrated in water droplet edge?

Greeting. I have noticed a pattern and wonder what is the reason. When ever I have suspension of particles in water droplet, be it bacteria or abiotic they seem to concentrate in the edge of the...

04 May 2018 10,029 1 View

Can I connect HP1047A RI detector to Agilent 1200 HPLC system?

Greetings We need to buy an RI detector for our Agilent 1200 HPLC system (connected to a computer running ChemStation). Given the high price of new detector I thought about buying a used one....

09 October 2017 7,137 10 View

Fluorescent dye that bind to dsRNA but not ssRNA?

Greetings all. We are looking into following the kinetics of short dsRNA melting and about using a dye that will bind differently to dsRNA and ssRNA. Any idea for such a dye? Or to another simple...

06 July 2017 6,650 1 View

Quantifying UV irradiation of different lamps by UV sensor?

Greetings I am trying to quantify UV irradiation form different UV lamps buy using UV sensor. The problem is the response curve of the sensor is different for different wavelength (as it is often...

05 June 2017 7,322 4 View

A simple procedure for coating polymer sheets with photocatalytic TiO2?

Greetings Does anyone have a simple protocol for coating polymer sheets with TiO2 to obtain effective photocatalytic sheets? Transparency is NOT and issue but flexibility will be. A collaboration...

31 December 2016 2,394 2 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 Feasible Method To Test Fluorescent Compounds Other Than Fluorescence Spectrometers ??

Is There Any Feasible Method To Test The Efficiency Of Fluorescent Compounds Other Than UV Spectrometers ? Suggestions Would Be Appreciated !

02 March 2021 5,785 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

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

What are difference between laser diodes, simple light emitting diodes and power light emitting diodes when operated in the visible spectrum ?

I want to illuminate a scene (small space) using LED to capture photographs or videos of some tiny objects inside the space. But am not sure if I should use a Laser LED, or simple LED or power...

22 February 2021 4,240 4 View

Could the "incoming radiation (net radiation)" values be negative?

Could the "incoming solar radiation" values be negative? What is the difference between "global solar radiation" and "incoming solar radiation"? Which one might be measured negative values?

21 February 2021 7,726 9 View

How to interpret this FTIR spectrum of pyrolyzed hydrochar?

20 February 2021 2,840 3 View

In methylene blue test Why is UV absorbance reading very low as soon adsorbent is added and then increasing before reaching equilibrium?

Hello, I'm working on removal of methylene blue. 01. in the dark test very first reading is taken 15 minutes after adding adsorbent to the dye solution and that UV absorbance reading is very...

19 February 2021 472 5 View