Non-isocyanate polyurethane thermoset based on a bio-resourced star-shaped epoxy macromonomer in comparison with a cyclocarbonate fossil-based epoxy resin: A preliminary study on thermo-mechanical and antibacterial properties

2019 ◽  
Vol 34 ◽  
pp. 558-567 ◽  
Author(s):  
Zeinab Karami ◽  
Kourosh Kabiri ◽  
Mohammad Jalal Zohuriaan-Mehr
Keyword(s):  
Epoxy Resin ◽  
Antibacterial Properties ◽  
Preliminary Study

scholarly journals The use of a new chemical device based on silver and cationic surfactants as a new approach for daily oral hygiene: A preliminary study on a group of periodontal patients

2019 ◽  
Vol 33 ◽  
pp. 205873841986810
Author(s):  
Dorina Lauritano ◽  
Annalisa Palmieri ◽  
Ornella D’Orto ◽  
Alessandro Bolzoni ◽  
Liliana Ottria ◽  
...  
Keyword(s):  
Oral Hygiene ◽  
Antibacterial Properties ◽  
Test Group ◽  
Study Groups ◽  
Control Group ◽  
Probing Depth ◽  
Chronic Periodontal Disease ◽  
Tingling Sensation ◽  
Didecyldimethylammonium Chloride ◽  
Preliminary Study

The aim of this study was to evaluate the abatement power of oral microbial loading of a new gel formulation based on the complex silver-2-mercaptobenzoate, chlorhexidine digluconate and didecyldimethylammonium chloride (named ADC) through polymerase chain reaction (PCR). The study sample consists of a group of 20 patients with chronic periodontal disease. Patients were over 25 years of age and did not undergo surgical or non-surgical periodontal treatment in the previous 6 months. The study sample was allotted into two groups of 10 patients each, homogeneous by age and sex. The test group received a bottle containing ADC gel, while the control group received an identical one containing placebo, similar to ADC in consistence, colour, taste and odour. Sub-gingival samples of four sites, one in each quadrant, of greatest probing depth in each patient were used. Microbiological analyses were performed at baseline and at day 15. Paired t test was performed to detect statistical significant reduction in total bacterial loading and oral pathogens in the study groups. The analysis showed a statistically significant reduction in the total bacterial loading evaluated pre- and post-treatment ( P = 0.029) in the study groups. In the control group, the decrease in total bacterial loading was not significant ( P = 0.279). Clinically, ADC gel does not have any side effects and discomfort such as pain, burning, tingling sensation or numbness and produces no adverse reactions in time. Our study aimed to evaluate the efficacy of a new chemical formulation with antibacterial properties to use for daily oral hygiene with a preliminary study. Our results showed a statistically significant reduction in total bacterial loading after treatment, but the limitations of our study do not allow us to demonstrate the clinical efficacy of the ADC gel.

Flame Retardant Epoxy Resin Containing Magnesium Phosphinate

2013 ◽  
Vol 634-638 ◽  
pp. 1927-1930 ◽  
Author(s):  
Jia Chen ◽  
Ji Yan Liu ◽  
Xue Qing Liu ◽  
Shan Sun
Keyword(s):  
Flame Retardant ◽  
Epoxy Resin ◽  
Flame Retardancy ◽  
Oxygen Index ◽  
Limiting Oxygen Index ◽  
Gas Source ◽  
Char Formation ◽  
Higher Temperature ◽  
Preliminary Study ◽  
Thermal Stability Of

In this paper, magnesium methylcyclohexylphosphinate (Mg(MHP)) was used as flame retardant for epoxy resin(EP).The flame retardancy and thermal stability of Mg(MHP)/EP composites have been studied. As a result, the composite with 20-25% Mg(MHP) can achieve the satisfying flame retardancy with the limiting oxygen index (LOI) of 29.05 % and passing the UL-94 V-0 rating. TG results showed that adding Mg(MHP) into EP leads to a increase in the onset temperature of degradation and depresses the thermal decomposition below around 470 °C. Beyond 470 °C, the residue char of the composites lost more quickly compared to neat EP. A preliminary study seem to conclude that Mg(MHP) acts as the condensed source by promoting the char formation below around 470 oC and as the gas source by vaporizing at higher temperature.

The Effect of Different Final Irrigant Activation Techniques on the Bond Strength of an Epoxy Resin–based Endodontic Sealer: A Preliminary Study

2014 ◽  
Vol 40 (6) ◽  
pp. 862-866 ◽  
Author(s):  
Hüseyin Sinan Topçuoğlu ◽  
Öznur Tuncay ◽  
Sezer Demirbuga ◽  
Asiye Nur Dinçer ◽  
Hakan Arslan
Keyword(s):  
Bond Strength ◽  
Epoxy Resin ◽  
Preliminary Study ◽  
Irrigant Activation

scholarly journals ANTIBACTERIAL PROPERTIES OF TEMPORARY FILLING MATERIALS

2018 ◽  
Vol 22 (5) ◽  
pp. 229-232
Author(s):  
S. V Tarasenko ◽  
L. A Grigor’janc ◽  
Ilana Aleksandrovna Gor ◽  
I. V Medvedeva ◽  
G. R Pogosyan
Keyword(s):  
Zinc Oxide ◽  
Antibacterial Activity ◽  
Growth Inhibition ◽  
Epoxy Resin ◽  
Antibacterial Effect ◽  
Antibacterial Properties ◽  
Petri Dish ◽  
Filling Materials ◽  
Sealing Materials ◽  
Temporary Filling

Object: assessment of the antibacterial effect of sealing materials based on epoxy resin, zinc-eugenol of cement and hydroxide of calcium. Materials and methods: Antibacterial activity was estimated by agaro-diffusive test (ADT) estimated the of microorganisms. Plates from filling materials were placed on Petri dish, the sowed with St. aureus, and a zone of a growth inhibition of microorganisms was estimated. Materials were used right after mixing, right after hardening, in 30 days after mixing. Results: Materials had the maximum antibacterial effect after hardening, minimum in 30 days after mixing. The greatest efficiency against St. aureus showed material based on zinc-oxide- eugenol cement.

THE BACTERIAL FLORA OF LOW-ACID VEGETABLES CANNED AT 212° F.: II. A PRELIMINARY STUDY OF THE EFFECTS OF EXTRACTS FROM PROCESSED TOMATO JUICE AND FROM TOMATO PLANTS ON BACTERIA INVOLVED IN FOOD PRESERVATION

1946 ◽  
Vol 24f (6) ◽  
pp. 467-473
Author(s):  
J. W. Conner
Keyword(s):  
Tomato Fruit ◽  
Bacterial Flora ◽  
Antibacterial Properties ◽  
Food Preservation ◽  
Tomato Juice ◽  
Tomato Plants ◽  
Food Industries ◽  
Tomato Seedlings ◽  
Test Organisms ◽  
Preliminary Study

Commercially processed tomato juice, dehydrated tomato stems, leaves, seed, and fruit (variety, Sutton's Very Earliest), and tomato seedlings (variety Pan America), were extracted with methanol and the extracts tested for antibacterial properties against certain species of bacteria important in the food industries, and other Gram-positive and Gram-negative types. The extracts prepared from tomato juice and tomato fruit inhibited the growth of most of the test organisms.

Ultrastructural investigation of spontaneous pituitary gonadotroph cell adenomas in aging Sprague-Dawley rats

1983 ◽  
Vol 41 ◽  
pp. 702-703
Author(s):  
D. J. McComb ◽  
J. Beri ◽  
F. Zak ◽  
K. Kovacs
Keyword(s):  
Electron Microscopy ◽  
Animal Model ◽  
Epoxy Resin ◽  
Immunoelectron Microscopy ◽  
Tumor Type ◽  
Gonadal Function ◽  
Sprague Dawley ◽  
Male And Female ◽  
Reticulin Fibers ◽  
Sprague Dawley Rats

Gonadotroph cell adenomas of the pituitary are infrequent in human patients and are not invariably associated with altered gonadal function. To date, no animal model of this tumor type exists. Herein, we describe spontaneous gonadotroph cell adenomas in old male and female Sprague-Dawley rats by histology, immunocytology and electron microscopy.The material consisted of the pituitaries of 27 male and 38 female Sprague Dawley rats, all 26 months of age or older, removed at routine autopsy. Sections of formal in-fixed, paraffin-embedded tissue were stained with hematoxylin-phloxine-saffron (HPS), the PAS method and the Gordon-Sweet technique for the demonstration of reticulin fibers. For immunostaining, sections were exposed to anti-rat β-LH, anti-ratβ-TSH, anti-rat PRL, anti-rat GH and anti-rat ACTH 1-39. For electron microscopy, tissue was fixed in 2.5% glutaraldehyde, postfixed in 1% OsO4 and embedded in epoxy-resin. Tissue fixed in 10% formalin, embedded in epoxy resin without osmification, was used for immunoelectron microscopy.

The Ultrastructure of Metastatic Human Mammary Carcinoma After Prolonged Estrogen Therapy

1967 ◽  
Vol 25 ◽  
pp. 180-181
Author(s):  
John H.L. Watson ◽  
John L. Swedo ◽  
R.W. Talley
Keyword(s):  
Mammary Carcinoma ◽  
Osmium Tetroxide ◽  
Estrogen Therapy ◽  
Ultrastructural Level ◽  
Uranyl Acetate ◽  
Human Mammary Carcinoma ◽  
Surgical Biopsy ◽  
Lead Hydroxide ◽  
Preliminary Study ◽  
Hormonal Therapies

A preliminary study of human mammary carcinoma on the ultrastructural level is reported for a metastatic, subcutaneous nodule, obtained as a surgical biopsy. The patient's tumor had responded favorably to a series of hormonal therapies, including androgens, estrogens, progestins, and corticoids for recurring nodules over eight years. The pertinent nodule was removed from the region of the gluteal maximus, two weeks following stilbestrol therapy. It was about 1.5 cms in diameter, and was located within the dermis. Pieces from it were fixed immediately in cold fixatives: phosphate buffered osmium tetroxide, glutaraldehyde, and paraformaldehyde. Embedment in each case was in Vestopal W. Contrasting was done with combinations of uranyl acetate and lead hydroxide.

Surface Structure in Microtomed Sections Caused by Glass and Diamond Knives

1971 ◽  
Vol 29 ◽  
pp. 456-457
Author(s):  
J. Temple Black ◽  
William G. Boldosser
Keyword(s):  
Plastic Deformation ◽  
Epoxy Resin ◽  
Carbon Coating ◽  
Surface Damage ◽  
Body Angle ◽  
Normal Manner ◽  
Bottom Side ◽  
Cutting Direction ◽  
Made In ◽  
Diamond Knife

Ultramicrotomy produces plastic deformation in the surfaces of microtomed TEM specimens which can not generally be observed unless special preparations are made. In this study, a typical biological composite of tissue (infundibular thoracic attachment) infiltrated in the normal manner with an embedding epoxy resin (Epon 812 in a 60/40 mixture) was microtomed with glass and diamond knives, both with 45 degree body angle. Sectioning was done in Portor Blum Mt-2 and Mt-1 microtomes. Sections were collected on formvar coated grids so that both the top side and the bottom side of the sections could be examined. Sections were then placed in a vacuum evaporator and self-shadowed with carbon. Some were chromium shadowed at a 30 degree angle. The sections were then examined in a Phillips 300 TEM at 60kv.Carbon coating (C) or carbon coating with chrom shadowing (C-Ch) makes in effect, single stage replicas of the surfaces of the sections and thus allows the damage in the surfaces to be observable in the TEM. Figure 1 (see key to figures) shows the bottom side of a diamond knife section, carbon self-shadowed and chrom shadowed perpendicular to the cutting direction. Very fine knife marks and surface damage can be observed.

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