Hi i want to ask that in order to find out LC 50 (96 hours) of particular toxin for fish. Should we keep the animals with food or without food?

if we expose the fish after acclimatization to particular toxin in order to find out LC 50 (96 hours).Should we keep the fish off feed or with feed for that duration. Some literature show that...

24 February 2021 357 2 View

QTL, recombination frection?

22 February 2021 2,588 2 View

How COVID-19 has affected mental health?

The pandemic has led to depression and anxiety and its negative effects shouldn't be ignored. However, it has also led some people to become more resilient! What do you think? Thank you.

21 February 2021 4,733 19 View

What are the dimensions by which the independent variable (big data) can be measured, Knowing We using the questionnaire instrument?

We have a research project consisting of three variables where big data is the independent variable. Some previous studies showed that Volume, Variety, Velocity and Veracity Are the dimensions...

21 February 2021 8,133 2 View

How can we determine the band gap of a composite material that is made up of a composition of direct and indirect band gap semiconductor materials?

I have a direct band gap material and an indirect band gap material. If I made a composite of both through physical mixing. Then how can I determine the band gap of such a material as the Tauc...

17 February 2021 8,104 4 View

Is There are any idea to achieve H NMR signals for swollen compound ??

the samples are not completely soluble - just swelled the solvents that's mean the sample may be partially soluble any suggestion, please

16 February 2021 8,801 3 View

Pseudo random number generator in Matlab code ?

i want to implement pseudo random number generator in matlab ...i request to every one if someone have code these PRNG share with me SplitMix Permuted Congruential Generator (PCG) Random...

14 February 2021 6,828 7 View

What is the method of removing RNase contamination from a filter paper surface?

I am working on a biosensing project on paper substrate, however, it is found that the RNase contamination occurs on the filter paper. Might I ask is there any method to clean the paper surface...

12 February 2021 3,926 3 View

What is causing the raw fluorescence to be negative?

Hi everyone, I would really appreciate it if someone can tell me when and why a raw fluorescence starts below zero. In the picture attached below the blue colour curve starts from a negative...

09 February 2021 4,642 3 View

Regarding immunology, transmissivity, herd immunity and vaccines in Sars CoV-2?

This is a follow-up on an earlier question regarding mechanistics of vaccines: why current vaccines don't block transmission. In summary, they don't engage mucosal immune cells to produce IgA....

08 February 2021 8,321 3 View

Is there a classification scheme for rock cavities or caverns with respect to their size and shape?

The range of forms and sizes of cavities in rock is very big. Is there a classification scheme for rock cavities regarding their size and shape?

02 March 2021 4,511 3 View

Arena simulation - how do i model the following model in ARENA (see description) (new to ARENA)?

Hello, I'm fairly new to ARENA and I have the following problem: I have two queues in which, in each queue, a different order type arrives (both having an arrival rate of exponential 10). Order...

02 March 2021 2,431 3 View

Which is the most convenient manufacturing software for Additive Manufacturing?

Which tools can be used to generate machine codes for additive manufacturing?

02 March 2021 7,220 2 View

No title

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

01 March 2021 5,311 1 View

How the wettability of rock sample can be changed by ageing in pure hydrocarbon oils only?

I want to do wettability analysis of hydrocarbon oil (octane)/rock/surfactant solution system. but to do the analysis first I have to make rock surface oil-wet. Since hydrocarbon oil does not have...

27 February 2021 5,383 3 View

Does different dilution factors affect negatively on NH3 reading ?

I have a sample of treated water sample & asked to obtain ammonia conc. in sample using a machine with 5-25 ppm detection range. However, upon testing with different dilution factors, all...

27 February 2021 8,483 3 View

How to measure angle between laser travel path and machine axis in Laser Measurement system?

25 February 2021 1,987 3 View

Any references about insects or animals that can damage or weathering of rock or fossil material?

Are there any references to insects or animals that can cause damage or weathering to the rock or fossil material? books or paper that would be nice. Thank you very much!

24 February 2021 6,805 3 View

Physical-chemical formation of stalactites/stalagmites. what promotes the formation/growth of these structures?

I know, or think I do, the basic idea behind these natural structures, as from what I know they form due to water dripping from the top leaving a salt deposit behind. But started to wonder about...

22 February 2021 1,400 4 View

How can we add reinforced thermoplastics with granules in injection molding machine?

I need to make an injection molding machine in which short fibers are to be introduced. Short fiber length and material properties are to be determined and also the material strength are to be...

22 February 2021 4,290 1 View