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GB/T 27024/ISO 17024 standard and accreditation for NDT personnel certification body
JIANG Jiansheng, DING Weichen
Nondestructive Testing ›› 2021, Vol. 43 ›› Issue (1) : 77-80.
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: NPX values represent relative abundance, not absolute concentrations (like pg/mL). Log2 Scale : The data is on a log2l o g sub 2
: NPX is typically standardized to allow for comparison across different batches or study samples. NKpx.7z
The file is likely a compressed archive containing scientific data related to Normalized Protein eXpression (NPX) , a proprietary data unit used in Olink Proteomics . : NPX values represent relative abundance, not absolute
: Datasets often include flags like QC_Warning or Assay_Warning ; researchers typically filter out records that do not "PASS" these checks. How to Use the File : Datasets often include flags like QC_Warning or
If you are working with the contents of this archive, keep the following in mind:
NPX data is typically log2-transformed and background-subtracted to represent the relative abundance of proteins across different biological samples. This specific file format—a 7-Zip archive ( .7z )—is often used to bundle large datasets such as the or other proteomic research archives to save space and ensure data integrity during transfer. Key Characteristics of NPX Data
scale, meaning a difference of 1 NPX unit corresponds to a twofold difference in protein concentration.
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