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[1] [3] L-Xylulose is a reducing sugar, so it may give false diagnosis of diabetes, as it is found in high concentrations in urine. However glucose metabolism is normal in people with pentosuria, and they are not diabetic. [4] Patients of pentosuria have a low concentration of the sugar d-xyloketose. [5]
Xylitol occurs naturally in small amounts in plums, strawberries, cauliflower, and pumpkin; humans and many other animals make trace amounts during metabolism of carbohydrates. [10] Unlike most sugar alcohols, xylitol is achiral. [12] Most other isomers of pentane-1,2,3,4,5-pentol are chiral, but xylitol has a plane of symmetry.
Arabic typography is the typography of letters, graphemes, characters or text in Arabic script, for example for writing Arabic, Persian, or Urdu. 16th century Arabic typography was a by-product of Latin typography with Syriac and Latin proportions and aesthetics.
The Arabic alphabet, [a] or the Arabic abjad, is the Arabic script as specifically codified for writing the Arabic language. It is written from right-to-left in a cursive style, and includes 28 letters, [ b ] of which most have contextual letterforms.
Those letters that do not have a close phonetic approximation in the Latin script are often expressed using numerals or other characters, so that the numeral graphically approximates the Arabic letter that one would otherwise use (e.g. ع is represented using the numeral 3 because the latter looks like a vertical reflection of the former).
The following is a non-exhaustive list of standardized tests that assess a person's language proficiency of a foreign/secondary language. Various types of such exams exist per many languages—some are organized at an international level even through national authoritative organizations, while others simply for specific limited business or study orientation.
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The Arabic script should be deducible from its transliteration unambiguously and without necessarily understanding the meaning of the Arabic text. The reverse should also be possible when the Arabic script is fully diacritized or vowelled (i.e. muxakkal with kasrah, fatHat', Dammat', xaddat', tanwiin and other Harakaat.).