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2. List of PDF software - Wikipedia

   en.wikipedia.org/wiki/List_of_PDF_software

   ABBYY FineReader: Commercial PDF converter which converts PDF into Word (.doc), Excel (.xls), PowerPoint (ppt), and more; deskUNPDF: PDF converter to convert PDFs to Word (.doc, docx), Excel (.xls), (.csv), (.txt), more; GSview: File:Convert menu item converts any sequence of PDF pages to a sequence of images in many formats from bit to ...

3. PDF - Wikipedia

   en.wikipedia.org/wiki/PDF

   A PDF file is often a combination of vector graphics, text, and bitmap graphics. The basic types of content in a PDF are: Typeset text stored as content streams (i.e., not encoded in plain text ); Vector graphics for illustrations and designs that consist of shapes and lines;

4. Smallpdf.com - Wikipedia

   en.wikipedia.org/wiki/Smallpdf.com

   The initial version of the site featured a standalone PDF compression tool. [5] Since then, the online platform has introduced over 16 PDF tools to convert, compress and edit PDF documents. [ 6 ] As of 2019, approximately 25 million unique users use Smallpdf every month.

5. Comparison of e-book formats - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_e-book_formats

   Older PDF files are supported by almost all modern e-book readers, tablets and smartphones. Newer PDF files may not display properly on older e-readers, may not open, or may crash them. However, PDF reflow based on Tagged PDF, as opposed to re-flow based on the actual sequence of objects in the content-stream, is not yet commonly supported on ...

6. Parts-per notation - Wikipedia

   en.wikipedia.org/wiki/Parts-per_notation

   In science and engineering, the parts-per notation is a set of pseudo-units to describe small values of miscellaneous dimensionless quantities, e.g. mole fraction or mass fraction. Since these fractions are quantity-per-quantity measures, they are pure numbers with no associated units of measurement. Commonly used are parts-per-million ( ppm ...

7. Nitrogen assimilation - Wikipedia

   en.wikipedia.org/wiki/Nitrogen_assimilation

   Nitrogen assimilation is the formation of organic nitrogen compounds like amino acids from inorganic nitrogen compounds present in the environment. Organisms like plants, fungi and certain bacteria that can fix nitrogen gas (N 2) depend on the ability to assimilate nitrate or ammonia for their needs.