Unlike the epithelium of the skin, a pseudostratified ciliated columnar epithelium appears to have multiple layers, but is actually only comprised of a single sheet of cells.The positioning of the nuclei within the individual columnar cells causes this illusion.ound most heavily along the respiratory tract, pseudostratified ciliated columnar epithelial cells help trap and transport particles brought in through the nasal passages and lungs.
The zip format is not the only compression format in use. Other common compression formats include RAR and 7-zip. According to Igor Pavlov, developer of 7-zip, the standard zip format underperforms the other two formats by as much as 30 to 40 percent, depending on the type of data being compressed.
File format [edit]. gzip is based on the DEFLATE algorithm, which is a combination of LZ77 and Huffman coding. DEFLATE was intended as a replacement for LZW and other patent-encumbered data compression algorithms which, at the time, limited the usability of compress and other popular archivers.zip is often also used to refer to the gzip file format, which is: 1  a 10-byte header, containing a magic number (1f 8b), a version number and a timestamp.