Idiopathic calcium oxalate (CaOx) stone-formers (ICSFs) differ from patients who make idiopathic calcium phosphate (CaP) stones (IPSFs). ICSFs, but not IPSFs, form their stones as overgrowths on interstitial apatite plaque; the amount of plaque covering papillary surface is positively correlated with urine calcium excretion and inversely with urine volume. The amount of plaque predicts the numb...

Deig, E. Frank (University of California, Berkeley), and H. M. S. Watkins. Plaque assay procedure for Colorado tick fever virus. J. Bacteriol. 88:42-47. 1964.-A reproducible plaque assay procedure is described for the quantitation of Colorado tick fever virus in a cell line established from embryonic hamster tissue. Under the best conditions, plaques approximately 4 mm in diameter were formed a...

An improved plaque assay for dengue virus was developed utilizing baby hamster kidney (BHK-21) cells initially grown in shaker culture. Different media preparations were tested for uniform and fast formation of BHK-21 cell sheets. Several overlay formulas were tested to develop a rapid plaque assay in 6- and 24-well plastic plates. The best results were obtained utilizing Eagle minimal essentia...

Objective: To examine the pH response to an acidic challenge in site-specific plaque following a six-week period of using toothpaste consisting of 1.5% arginine and 1450 ppm fluoride or just using 1450 ppm fluoride toothpaste alone, in relation to caries. Methods: Thirty-three healthy adults with no caries (caries-free) or ≥1 current manifest lesion (caries) participated in the study. Interprox...

End-product inhibition of acid production in Streptococcus mutans R9 was investigated by measuring effects of varying concentrations of H+ and of undissociated lactic or acetic acids on acid production rates in the pH stat. H+ caused purely uncompetitive inhibition (inhibition constant Kiu 0.018 mmol 1(-1). Lactic acid caused mixed inhibition with inhibition constants of Kiu 4.24 mmol 1(-1) and...

Background: The amount and quality of saliva play important roles in maintaining an intraoral bacterial balance. is defined by its buffering capacity, viscosity, pH protein content. usually related to the flow rate. Purpose: This study aimed compare rate, pH, viscosity capacity as well plaque formation children before after dental treatment. Methods: Saliva samples were taken from paediatric pa...

BACKGROUND The goal of this study was to identify the in vivo effects in patients with hyposalivation of a novel slowly dissolving adhering test disc upon on enamel remineralization, oral biofilm, salivary production, pH and buffering, gingival health, and on self-evaluation of oral well-being. METHODS Five subjects with xerostomia wore custom made retainers carrying 5 demineralized enamel ch...

conclusions similar to previous studies, this study could not show the superiority of electric toothbrush over manual in plaque removal. after 72 hours, the mean of plaque index was greater in buccal than in lingual surface, which may be attributed to the natural cleansing action of the tongue. results the mean of plaque index was 2.13 ± 0.83 and 2.11 ± 1.01 in the manual and electric toothbrus...

Safferman, Robert S. (Robert A. Taft Sanitary Engineering Center, Cincinnati, Ohio), and Mary-Ellen Morris. Growth characteristics of the blue-green algal virus LPP- 1. J. Bacteriol. 88:771-775. 1964.-The blue-green algal (BGA) virus, strain LPP-1, formed two distinct plaque variants. During subsequent propagation, each of the isolated variants eventually reverted to a mixture of both plaque ty...