Do you know any type of Urease active ultramicrobacteria?

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

Carbonate deposits resulting from a microbial process in a solution containing required nutrients for bacterial growth, 0.1M CaCl2, 0.78M urea and 50% seawater (composed of 0.055M Mg2+, no Sr)...

04 May 2015 1,196 9 View

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

I am looking for someone, who is expert and interested in investigation of caco3 polymorphs formation through microbial activity, for cooperation in writing a research paper (as an co-author). I...

02 March 2015 7,962 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 1,514 12 View

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

It is known that the urea will be degraded to NH4+ and CO2 within a hydrolysis process. In higher concentration of urea, [NH4+] increases till the point at which the solution is supersaturated...

01 February 2015 2,887 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 9,208 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 5,633 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 5,303 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 454 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 2,721 6 View

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

I did a two-level full factorial design in order to find the significance of three factors (A, B, C) and their interactions on a response (R). Due to interaction between minimum level of A and...

08 September 2014 7,473 5 View

Why Do TDS and EC Increase with Larger Wastewater Volumes, While BOD and COD Decrease?

I have carried out MFC experiments on three different volumes, 50, 500 and 1000 mL of wastewater. Results after MFC treatment shows that TDS and EC are more in larger volumes of water i.e. TDS and...

09 August 2024 9,621 0 View

What precautions should be taken while handling S. aureus enterotoxin Type B in the lab?

I would like to understand potential safety concerns while handling SEB in the lab. Especially while working in animal house facility. Would like to know precautions for handling. Sigma MSDS...

07 August 2024 6,034 3 View

How do soil microflora interact with plant roots and influence plant nutrition, health, and productivity?

06 August 2024 9,618 3 View

How do soil microbes affect plant health and productivity and how do plants interact with soil microorganisms and contribute to soil fertility?

31 July 2024 5,087 4 View

How do pollutants in soil affect soil microorganisms and role do microorganisms play in nutrient cycling and soil fertility?

31 July 2024 368 2 View

What is the role of microorganisms in soil fertility and crop production cycles and role of microorganisms in mineral transformation?

31 July 2024 8,483 8 View

How does the Retention time effect the Biogas Production?

List down the various factors responsible and how does this effect the overall biogas production when it is related to Hydraulic retention time of the digester based on the feedstock?

27 July 2024 4,800 4 View

What roles do microbial communities play in the environment and roles played by microorganisms in our environment?

25 July 2024 1,992 2 View

How do bacterial species contribute to ecosystem functions and nutrient cycling and role of microbial communities for sustainability?

25 July 2024 2,351 2 View

How do microbial communities contribute to ecological cycles on Earth and how does an agroecological system support diverse microbial communities?

25 July 2024 5,197 2 View