{'fraction_non_alphanumeric': 0.03697749196141479, 'fraction_numerical': 0.03858520900321544, 'mean_word_length': 4.990384615384615, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
[Possibility of stabilizing urea in preparation of control specimens].

9-Triphenylphosphoniomethylphenanthrene chloride (9-TC) is a highly effective antibacterial biochemical stabilizer of the urea, which, used in concentrations 0.6 to 2.45 mmoles/liter, stabilizes its content in the serum for 990 days. Control specimens are prepared as follows: 100 ml of human or animal blood serum is added to 900 ml of 1.82 mmole aqueous solution of 9-TC, mixed, 24 h stored at 4-8 degrees C, and centrifuged. The resultant centrifugate is used as reference specimen for controlling urea measurements by the diacetylmonoxime method.