Is it possible to obtain a negative cronbach alpha?

Good evening everyone. If a questionnaire has 4 factors measuring different constructs as for example CAMI questionnaire measuring attitudes toward the mentally ill that has four factors:...

18 February 2021 3,223 3 View

What is exact impact of pH on preparation method of nanoparticles? why some nanoparticles are synthesized in ACIDIC pH while others in alkaline pH?

I am trying to prepare Cerium oxide nanoparticles. literature suggested the acidic pH of the reaction. what is the reason? what is the mechanism if so

28 November 2020 8,825 2 View

Estimate / Predict remaining useful life of a bearing without data of previous failure?

Hello, I am trying to write a program in Matlab to estimate the remaining useful life of a bearing without data of a previous failure. Do you think this is possible? I was thinking to use the...

27 November 2020 9,863 3 View

Two way ANOVA with non normal data?

Good afternoon everyone. I would like to know your oppinion or advise for the following: I would like to compare the results of a variable measured with a likert scale. I have two (or three)...

19 October 2020 4,564 4 View

Comparing two independent groups with very different sample size?

Hello eveyone. I would like to know your oppinion on the following. Do you think that it is adequate to compare two groups with very different sample size and non normal sample distribution? for...

19 October 2020 8,475 4 View

Total Alkaloid Content?

Can someone suggest a simple calorimetric assay protocol for determination of total alkaloid content of plant extract?

10 September 2020 8,835 3 View

What are the environmental problems caused by phosphorus pollution ?

What are the environmental problems caused by phosphorus pollution ?

27 July 2020 948 34 View

What are the harmful effects of nitrates higher concentration on public health?

15 July 2020 3,900 10 View

What are the best methods of water management in the case of an agricultural drought ?

The importance of water resources is evident, and its management through all levels is imperative, especially in arid and semi-arid countries where water demand is highly required for irrigation...

10 July 2020 6,153 7 View

What are the advantages of using renewable energies for the desalination of seawater?

what are the advantages of using renewable energies for the desalination of seawater?

28 June 2020 6,093 3 View

Isolates of Hymenoscyphus fraxineus?

Dear Dr. Cai, my name is Simone Prospero and I work in the team of Phytopathology at the Swiss Federal Institute for Forest Snow and Landscape Research (WSL;...

01 March 2021 1,133 1 View

Which Journals would you advise to submit a Letter which briefly talks about neurosurgical treatment of neuro-oncological patient during Sars-COV-2?

Possibily not an open access journal which does not add any publishing costs once being accepted. Thank you in advance

09 February 2021 717 6 View

ACE2 Blotted as a double band?

Hello, I have recently run a western of Vero cells for ACE2. I detected ACE2 at the correct size, but it presents as a double band. The sample was prepared by lysing cells in 1X Laemmli...

07 February 2021 6,973 3 View

How to dissolve Scotch tape to collect the Au particles [analogous to the mechanical exfoliation of graphene]?

Hi everyone, I'm a mechanical person and now may need some help from chemistry experts. My question should be as easy as pie for the chemistry person. I prepared some Au particles in nanoscale...

21 January 2021 2,426 3 View

How commonly do you encounter Rummination Syndrome in your GI practice?

Do diaphragmatic breathing and speech therapy actually help? How often did you require multidisciplinary team approach?

17 January 2021 5,998 0 View

Is it correct to include variables as a group and as individual component in multivariable cox or logistic regression?

For example : If I am conducting the effect of metabolic syndrome on short term mortality of disease xy, can I enter "metabolic syndrome" as one variable and its components (diabetes,...

11 January 2021 6,348 2 View

It does not appear logistically possible to vaccinate everyone for COVID. So what's the point?

Public health authorities claim that no one is safe from COVID-19 until every one is safe. This has translated into a goal to vaccinate everyone who can be vaccinated. Logistically, however, it...

06 January 2021 4,269 12 View

How we can calculated LOAEL and NOAEL for toxic pathological dose ?

how we can calculated LOAEL and NOAEL for toxic pathological dose

02 January 2021 1,175 2 View

Any one can tell me primer sequences used for q PCR to quantify MERS-CoV related coronavirus?

MERS-CoV primers

31 December 2020 2,389 2 View

How can I explain the rats' behavior in the open field test, if the induced rats stayed in the center area without movement?

I have worked on an animal model to induce fibromyalgia syndrome in rats when I tried to express data of open field test, I found that normal rats had moved fast after putting them in the central...

31 December 2020 7,736 3 View