When you measure pH, the value you see is based on ions, specifically hydrogen ions (H+). The amount of H+ determines the acidity or alkalinity; if there are more hydrogen ions present, then your pH will be acidic (0-7) and if there are less H+ relative to hydroxyl groups (OH-)...
How and when to measure pH in IVF culture media: validation of a portable blood gas analyzer in two IVF culture dishes for time lapse and conventional incubatorspHAnalytical validationEmbryoIVFCulture mediaPurpose Maintaining a stable pH at optimal level in human embryo culture media is crucial for...
Post-test questionnaires like the SUS measure perceived usability of an entire system; post-task scales suggest problematic parts of a design. Video Author Jakob Nielsen, Ph.D., is a retired principal and co-founder (with Dr. Donald A. Norman) of the Nielsen Norman Group. Jakob established ...
The higher the value of the likelihood function, the more credible the model parameter is. LL(α,β)=lnL=∑i=1N(yinlnPrni+(1-yin)ln(1-Prn(i))) (7)where N represents the number of the samples. 4. Data collection and analysis 4.1. Survey design A survey was conducted to measure ...
This is called a “cohort.” For example, you may define a cohort as all customers who purchased in January 2021, and then look at that cohort over the next 12 months. With these two concepts—average repeat purchase timeline and customer cohorts—you can confidently measure regular e...
The capability of an electrode material to store electric charge by undergoing a redox reaction is frequently called capacity, but apparently there is no generally accepted or even specifically designated term. This capability is measured in terms of charge, i.e., C or As. Any number is useful...
No, you do not need a license to sell soap in the US. You might need to get a business license to operate legally, though this is on a state-by-state or even more local basis. You’ll also need to adhere to specificFDA guidelines and regulationsto market your soap, and it’s your...
After setting up your titration equipment and measuring your analyte, transfer the analyte into your flask or beaker, making sure any solid analyte is rinsed into the container with distilled water. Add more distilled water until the analyte is completely dissolved. Measure and record the volume of...
To measure the distances, the diameter of the petri dish (9 cm) was used as a reference scale. Then, a line was drawn from the inoculation point of the spores to the Streptomyces colony that is furthest from the inoculation point. The distance of the line was calculated based on the ...
Four studies were conducted to develop and validate the Sexual Assertiveness Scale (SAS), a measure of sexual assertiveness in women that consists of facto... Morokoff,Patricia,J.,... - 《Journal of Personality & Social Psychology》 被引量: 248发表: 1997年 Do women sometimes say no when ...