Is there any other way to measure and quantify the color of a sample other than contact measurement and photography?

Gemstone is a kind of sample with special physical appearance. Are there any test methods or instruments recommended for the following situations? 1. Testing gemstone samples with high...

08 September 2019 8,332 3 View

How to exclude the influence of surface luster when evaluating gemstone color by human eyes?

The color matching method is very common in the process of gemstone color evaluation, using master stone or standard color card. When the luster of gemstone is obviously different from that of...

06 July 2019 9,167 2 View

Is there an algorithm that can convert Munsell color system to CIE colorimetric coordinates ?

The Munsell color system uses a three-dimensional space to represent three basic visual psychological attributes of various surface colors, amely Hue, Value and Chroma, and labels each color...

02 March 2019 5,607 3 View

How to identify a color-treated red jadeite? What is the principle of red enhancement when red jadeite is heated at high temperature?

The most of natural high-quality red jadeites are too small to be gemstones, so the heat treatment in the market is very common. Heat the deep-red one at a high temperature to turn it into a...

01 February 2019 3,425 2 View

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31 December 2018 8,082 3 View

When using X-rite Color i5 to measure the color of samples, which light source should I choose?

When using X-rite Color i5 to measure the color of samples, there will be several groups of data under different light sources shown on the instrument. Since the testing area is an enclosed...

31 December 2018 3,980 2 View

How to interpret color difference formula CIE DE2000?

11 December 2018 625 5 View

Is it feasible to evaluate the gemstones' color quality by the images taken with cameras?

When a gemstone is photographed with a camera, the body color of the gemstone changes. Different camera settings, photographs taken are also different. Is the color of iridescence, fire, changes...

11 December 2018 8,077 6 View

How to evaluate a gemstone whose color is obvious only under transmitted light?

There is a kind of jade similar to omphacite, with special attributes characterized by blackness in the reflecting light, greenness in the transmitted light . Now we need to establish a color...

11 December 2018 4,900 3 View

What is your perception on using visual analysis or quantitative approaches to evaluate data from single-case research designs (n of 1 trials)?

Results of single-case research designs (i.e., n-of-1 trials) are often evaluated by visually inspecting the time-series graph and computing quantitative indices. A question our research team is...

03 March 2021 687 1 View

How to quantitative analize the data of TNBS assay for gelatin?

Estemeed colleagues, I found some issues regarding the quantification of the data for TNBS assay. There are different protocols on how to perform that but it is clear to me the "fil rouge" that...

02 March 2021 2,616 1 View

Sample dilution for quantitative analysis using ELISA?

If the detection range is in ng/ml but the reference range is in ug/ml for a molecule or protein in serum or plasma .how to dilute and what is the initial volume to be taken for quantitative analysis

02 March 2021 7,670 3 View

Do you know good and user-friendly programs to measure plant quantitative traits?

For my research i will need to measure plant quantitative traits (especially leaves area and roots length, but would be nice to add some more information). I recently discovered...

01 March 2021 5,035 2 View

Does anyone know HRM channel in a 2 plex QIAGEN Rotor- Gene Q qPCR can be used as a separate channel?

I am going to have 3 different probes in my qPCR work that I am going to do. But I realized that the machine we have in the lab is a Rotor-Gene Q 2plex HRM Platform, saying it has green, yellow,...

01 March 2021 8,544 1 View

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Does anyone have the experience of using Taq Man probes in the QIAGEN Rotar- Gene qPCR machine?

01 March 2021 5,311 1 View

Distribution of particles in metal matrix?

How would define the "good" and "poor" distribution of particles within the matrix. Is there a quantitative solution to assess the distribution of the particles, which then having denotation of...

28 February 2021 7,397 8 View

MiRNA qpcr problem?

Dear All, mirna primer showing some problem in the melting curve? any idea why? As attached is the melting curve. The forward sequence is obtained from miRBase and reverse primer is universal.

28 February 2021 5,008 4 View

VIF very high, but correlation is low and coefficient is significant. Which one whould I choose?

Hello. I have a question whether if my coefficients (statistically significant) would be valid when VIFs are really high. In my model, there are independent variables(IV), moderating variables...

26 February 2021 956 13 View

No amplification data for qPCR on MxPro?

I have set up a qPCR run on MxPro with SYBR green and ROX as a reference, however, when I go to the analysis section the program seems to only collect data for the dissociation curves and not the...

25 February 2021 8,039 1 View