Why have peaks at 590 and 798 cm-1 appeared in the IR spectrum of biogenic carbonate deposits?

04 May 2015 1,027 9 View

Is there anyone with research experience and interest in investigation of biogenic calcium carbonate polymorphs?

02 March 2015 7,850 3 View

Comparing the XRD patterns of mixtures containing CaCO3, how can I just roughly prove that one sample contains more aragonite than another one?

I have the XRD patterns of two samples which mainly contains calcite and aragonite (S1 and S2, see the attachments). How can I just roughly say that S2 has more amount of aragonite than S1?

01 February 2015 1,393 12 View

How can I find the urea concentration within a urea hydrolysis process?

01 February 2015 2,751 3 View

What does it mean when a reaction has a rate constant greater than one (K>1)?

I recorded the concentrations of a product during a reaction. There was an enzyme producing bacteria as catalyzer. Then I plotted the concentration changes versus time and fitted a modified...

31 December 2014 9,073 9 View

Why is a sample contained Calcite identified as Nitratine by XRD analysis?

I analyzed a sample contained calcite using XRD. The pattern attached. It was identified as nitratine by the related software searching the database of XRD patterns. As nitratine is isostructural...

31 December 2014 5,513 10 View

How much a fit model with the following statistics is reliable?

How much a model with: - Model p-value < 0.05 - Lack of fit p-value > 0.1 - R2=0.99, Adj. R2= 0.99, Pred. R2=0.99 - normal probability plot attached (residuals do not follow a straight...

09 October 2014 5,187 2 View

Is anyone familiar with full factorial design?

I did a 2-level full factorial design with 3 factors in order to find the significance of each factor and their interactions on a response. After ANOVA on non-transformed response, I found no...

08 September 2014 331 11 View

Generalized linear model or Least squares model?

I did the following full factorial experiments to find the significance of variables and fit model. I analyzed the data using the standard least squares model and generalized linear model (normal...

08 September 2014 2,582 6 View

How can I analyze a full factorial design with some undetectable responses due to interaction between factors?

08 September 2014 7,333 5 View

How to normalise data on OPM package from R Studio ?

Good afternoon, I recently used OmniLog from BIOLOG for my experimentations : I tested the metabolism of different strains on 2 types of plates. I have 16 strains of 3 different groups...

02 March 2021 3,584 1 View

Has anyone used the Illumina ITS1 primer sets?

Hi everyone, Illumina provides a list of primers to amplify with high taxonomic coverage the ITS1 region for further fungal sequencing, but I cannot find the exact amount necessary of each...

25 February 2021 6,969 3 View

Is there any one who can provide a donation of HPV detection and genotyping kits in exchange collaboration fors?

Warm greetings My name is Ayichew S. and I am doing my Ph.D. in Medical Microbiology (on Human papillomavirus). At this stage, I have almost completed a clinical sample Cervical swabs)...

25 February 2021 1,660 3 View

Is there any one who can provide a donation of HPV detection and genotyping kits in exchange collaboration forms?

Warm greetings! My name is Ayichew S. and I am doing my Ph.D. in Medical Microbiology focusing on Human papillomavirus). At this stage, I have almost completed a clinical sample (Cervical swabs)...

25 February 2021 3,612 3 View

Advice on growing lactobacillus species in the lab?

Hello everyone, For part of my PhD project, I'm hoping to grow some lactobacillus species in the lab so that I can create standard curves for a qPCR quantification of a faecal sample. However, I...

24 February 2021 3,157 6 View

Is this the write procedure for acid digestion of soil for heavy metal analysis using AAS?

How to do acid digestion of soil sample with 3:1 aquaregia in an open vessel?

23 February 2021 3,053 7 View

Are there packages (R or Python) for simple models (bucket?) to assess soil water content?

Hi everyone. I am researching droguht effects on soil water drought. I am looking for already implemented functions in R or Python to estimate soil water content from precipitation,...

21 February 2021 2,084 1 View

Which type of loading is to be used in dynamic analysis of Machien foundation?

Hello Everyone, Hope you all are doing well. I'm trying to simulate a machine foundation in ABAQUS with a geo-cell reinforced soil bed. Im totally confused to which type of loading would be...

21 February 2021 4,388 3 View

Can one use just 250 micron sieve & still get a good number of mycorrhizal spores from the soil?

In a situation where one cannot get the appropriate & separate levels of sieve for mycorrhizal survey work, can just one level of sieve give good results & spore counts?

13 February 2021 3,760 2 View

Differences between sheep blood with Alsever solution vs citrated/defibrinated sheep blood in microbiological media?

I am aware of a study that has compared the use of citrated and defibrinated sheep's blood in microbiological media (Hair Sheep Blood, Citrated or Defibrinated, Fulfills All Req... ), but can...

10 February 2021 5,927 1 View