Sugar Fermentation Tests The media are prepared from Coignet's gold medal gelatin in a manner similar to that described for the liquefaction test. Instead of sheet gelatin, Difco nutrient gelatin in about double strength poured out to form sheets can also be used with equally satisfactory results. After formolization the gelatin sheets are cut or punched into shapes, about 15 mm. diameter, conv...

Fifteen patients with hypertension due to phaeochromocytoma and 35 controls with essential hypertension were studied to assess the diagnostic value of urinary and plasma biochemical determinations in phaeochromocytoma. In every case of phaeochromocytoma the urinary concentration of vanillylmandelate, metanephrines, or adrenaline plus noradrenaline was diagnostic of the disease irrespective of w...

The study of antifolate-resistant mutants of the protozoan parasite Leishmania has provided useful information about genetic processes such as gene amplification and mutation and knowledge of the unique features of the pteridine metabolic pathway in this primitive eukaryote. The novel bifunctional dihydrofolate reductase-thymidylate synthase (DHFR-TS) is an essential enzyme, yet most DHFR-TS in...

This review considers some of the more common problems in the interpretation of the results of biochemical tests and, where possible, highlights ways in which errors can be identified or avoided.

Background: Traditional dairy products are the main sources for probiotic bacteria. This study aimed to isolate and characterize the potentially probiotic Lactobacillus strains isolated from traditional dairy products in Iran. Methods: Microbial population of each dairy product was enriched and screened for acid- and bile- resistant strains. The isolates were ...

The relationships observed among several serotypes of Enterobacteriaceae make it desirable to discuss the following in one paper: 1. ShigeUa dysentriae 2 (ShigeUa ambigua). 2. Escherichia coli 0 group 112 a,c of Ewing and Kauffmann (1950) (Shigella guanabara of de Assis, 1948). 3. Escherichia coli, strain 6182-50 (representative of a new E. coli 0 group, 113). 4. Escherichia coli 0 group 112 a,...

The new VITEK 2 system is a fully automated system dedicated to the identification and susceptibility testing of microorganisms. In conjunction with the VITEK ID-YST card the VITEK 2 system allows the identification of clinically important yeasts and yeast-like organisms in 15 h due to a sensitive fluorescence-based technology. The ID-YST card consists of 47 biochemical reactions. The database ...

A field biochemical epidemiology study was conducted using the Michigan cohort consisting of 51 rural residents exposed to polybrominated biphenyls (PBB). The study had three major objectives: a) to determine the serum half-life of the major PBB congener, hexabromobiphenyl (HBB), in the human, b) to determine if the PBB-exposed subjects had elevated cytochrome P-450I function as determined by t...

Analysis of volatile organic compounds (VOCs) emanating from human exhaled breath can provide deep insight into the status of various biochemical processes in the human body. VOCs can serve as potential biomarkers of physiological and pathophysiological conditions related to several diseases. Breath VOC analysis, a noninvasive and quick biomonitoring approach, also has potential for the early d...