Antibacterial Action of Powdered Semiconductor on a Serotype g Streptococcus mutans (Short Communication)

1988 ◽  
Vol 22 (4) ◽  
pp. 230-231 ◽  
Author(s):  
T. Morioka ◽  
T. Saito ◽  
Y. Nara ◽  
K. Onoda
Keyword(s):  
Streptococcus Mutans ◽  
Short Communication ◽  
Antibacterial Action

Invasion of Streptococcus mutans and Lactobacillus salivarius in Early Caries Lesions of Gnotobiotic Rats (Short Communication)

1989 ◽  
Vol 23 (5) ◽  
pp. 371-374 ◽  
Author(s):  
L. Seppä ◽  
H. Luoma ◽  
H. Forss ◽  
S. Spets-Happonen ◽  
S. Markkanen ◽  
...  
Keyword(s):  
Streptococcus Mutans ◽  
Short Communication ◽  
Lactobacillus Salivarius ◽  
Early Caries ◽  
Caries Lesions

The Antibacterial Action of the Various Components of the Lactoperoxidase System on a Cariogenic Strain of Streptococcus mutans

1977 ◽  
Vol 56 (12) ◽  
pp. 1603-1607 ◽  
Author(s):  
Jorma Tenovuo ◽  
Matti L.E. Knuuttila
Keyword(s):  
Streptococcus Mutans ◽  
Physiological Activity ◽  
Antibacterial Action ◽  
Lactoperoxidase System

Physiological activity of lactoperoxidase and in vivo concentration of thiocyanate ions were shown to be inhibitory against a cariogenic strain of Streptococcus mutans. However, the amount of H2O2 in vivo may be too low for optimum inhibition by lactoperoxidase system. H2O2 alone also inhibited the growth of S mutans to some degree.

scholarly journals Dual-light photodynamic therapy administered daily provides a sustained antibacterial effect on biofilm and prevents Streptococcus mutans adaptation

2020 ◽  
Author(s):  
S Nikinmaa ◽  
H Alapulli ◽  
P Auvinen ◽  
M Vaara ◽  
J Rantala ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Streptococcus Mutans ◽  
Near Infrared ◽  
Relative Increase ◽  
Light Energy ◽  
Antibacterial Action ◽  
Logarithmic Scale ◽  
Treatment Protocols ◽  
Bacterial Viability ◽  
Total Light

AbstractIntroductionAntibacterial photodynamic therapy (aPDT) and antibacterial blue light (aBL) are emerging treatment methods auxiliary to mechanical debridement for periodontitis. APDT provided with a near infrared (NIR) light in conjunction with an indocyanine green (ICG) photosensitizer has shown efficacy in several dental in-office-treatment protocols. In this study, we tested Streptococcus mutans biofilm sensitivity to either single-light (aPDT or aBL) or dual-light aPDT (simultaneous aPDT and aBL) exposure.Materials and MethodsBiofilm was cultured by pipeting diluted Streptococcus mutans suspension with growth medium on the bottom of well plates. Either a single-light aPDT (810-nm aPDT or 405-nm aBL) or a dual-light aPDT (simultaneous 810-nm aPDT and 405nm aBL) was applied, in both cases together with the ICG photosensitizer, while keeping the total light energy constant at 100J/cm2. Single-dose light exposures were given after one-day, four-day or fourteen-day biofilm incubations. Also, a repeated daily dose of the same light energy was applied during biofilm incubations on four-day and fourteen-day biofilms. Finally, antibacterial action of the dual-light aPDT with different relative ratios of 810 nm and 405 nm of light energy was examined on the single-day and four-day protocols. Biofilms were scraped, diluted into ratios between 1:1 to 1:100 000, and plated. After re-incubation, colony-forming units (CFUs) were counted, and confocal 3D biofilm imaging was performed.ResultsOn a one-day biofilm, dual-light aPDT was significantly more efficient than single-light aBL or aPDT, although all modalities were bactericidal. On a four-day maturated biofilm, a single exposure of aPDT or dual-light aPDT was more efficient than aBL, resulting in a four logarithmic scale reduction in bacterial counts. Surprisingly, when the same amount of aPDT was repeated with a daily dosing on a four-day or a fourteen-day biofilm, bacterial viability improved significantly. A similar but milder response of improved bacterial viability was seen after repetitive aBL application. The viability improvement was eliminated when dual-light aPDT was applied. By changing the relative light energy ratios in dual-light aPDT, a relative increase in aBL improved the antibacterial action of dual-light aPDT when the biofilm was older.ConclusionWhen aPDT is administered repeatedly to S. mutans biofilm, a single wavelength-based aBL or aPDT leads to a significant biofilm adaptation and increased S. mutans viability. The combined use of aBL light in synchrony with aPDT arrests the adaptation and provides significantly improved and sustained antibacterial efficacy.

Cell Wall Ultrastructure in Three Strains of a Cariogenic Streptococcus

1971 ◽  
Vol 29 ◽  
pp. 338-339
Author(s):  
M. J. Kramer ◽  
Alan L. Coykendall
Keyword(s):  
Cell Wall ◽  
Dental Caries ◽  
Streptococcus Mutans ◽  
Microscopic Study ◽  
Electron Microscopic Study ◽  
Genetic Heterogeneity ◽  
Morphological Characteristics ◽  
Electron Microscopic ◽  
Dna Reassociation ◽  
Wall Ultrastructure

During the almost 50 years since Streptococcus mutans was first suggested as a factor in the etiology of dental caries, a multitude of studies have confirmed the cariogenic potential of this organism. Streptococci have been isolated from human and animal caries on numerous occasions and, with few exceptions, they are not typable by the Lancefield technique but are relatively homogeneous in their biochemical reactions. An analysis of the guanine-cytosine (G-C) composition of the DNA from strains K-1-R, NCTC 10449, and FA-1 by one of us (ALC) revealed significant differences and DNA-DNA reassociation experiments indicated that genetic heterogeneity existed among the three strains. The present electron microscopic study had as its objective the elucidation of any distinguishing morphological characteristics which might further characterize the respective strains.

Ultrastructure of primary spermatocyte in fish (Tilapia: Oreochromis niloticus): The synaptonemal complex

1986 ◽  
Vol 44 ◽  
pp. 288-289
Author(s):  
T. Guha ◽  
A. Q. Siddiqui ◽  
P. F. Prentis
Keyword(s):  
Fine Structure ◽  
Electron Microscope ◽  
Synaptonemal Complex ◽  
Oreochromis Niloticus ◽  
Short Communication ◽  
Primary Spermatocyte ◽  
Mitotic Division ◽  
Meiotic Cell ◽  
Electron Microscope Level ◽  
Homologous Chromosomes

The Primary Spermatocytes represent a stage in spermatogenesis when the first meiotic cell division occurs. They are derived from Spermatogonium or Stem cell through mitotic division. At the zygotene phase of meiotic prophase the Synaptonemal complex appears in these cells in the space between the paired homologous chromosomes. Spermatogenesis and sperm structure in fish have been studied at the electron microscope level in a few species? However, no work has yet been reported on ultrastructure of tilapia, O. niloticus, spermatozoa and spermatogenetic process. In this short communication we are reporting the Ultrastructure of Primary Spermatocytes in tilapia, O. niloticus, and the fine structure of synaptonemal complexes seen in the spermatocyte nuclei.

SHORT COMMUNICATION

1997 ◽  
Vol 61 (3) ◽  
pp. 275-279 ◽  
Author(s):  
S. MONNO ◽  
Y. MIZUSHIMA ◽  
N. TOYODA ◽  
T. KASHII ◽  
M. KOBAYASHI
Keyword(s):  
Short Communication

Short Communication: Synthesis of Polymer-Embedded Metal Clusters by Thermolysis of Mercaptides—Polymer Blends

Polymer News ◽  
2005 ◽  
Vol 30 (9) ◽  
pp. 296-300
Author(s):  
F. Esposito ◽  
V. Casuscelli ◽  
M. V. Volpe ◽  
G. Carotenuto ◽  
L. Nicolais
Keyword(s):  
Polymer Blends ◽  
Short Communication ◽  
Metal Clusters ◽  
Communication Synthesis
Sign in / Sign up

Export Citation Format

Share Document