scholarly journals Evaluation of mutagenic effects of pure hydroxyapatite doped with chromium (III) through the SMART Test in Drosophila melanogaster Meigen, 1830 (Diptera: Drosophilidae)

2017 ◽  
Vol 4 (8) ◽  
pp. 293-300 ◽  
Author(s):  
Silmara de Moraes Pantaleão ◽  
Marcio dos Santos ◽  
Heriberto A. Anjos ◽  
Alyne D. Lima ◽  
Bruno Lassmar B. Valadares ◽  
...  
Keyword(s):  
Drosophila Melanogaster ◽  
Negative Control ◽  
Trivalent Chromium ◽  
Host Tissue ◽  
Chemical Similarity ◽  
Mineral Phase ◽  
Mutagenic Potential ◽  
Mutagenic Effects ◽  
Negative Controls ◽  
Replacement Factor

Hydroxyapatite (HAP) is a bioceramic used in the medical and dental areas as a bone replacement factor due to its chemical similarity to the mineral phase of bones and teeth. Its use in implants stimulate the growth of bone tissue, showing no toxicity or rejection of the host tissue. Its nanostructured form has been shown to be a viable alternative for photoprotection when doped with metal ions, such as trivalent chromium (Cr+³). Due to the reach of this form among the population, this work evaluated the mutagenic potential of pure nanostructured hydroxyapatite (HAP) and doped with trivalent chromium (Cr+³) (HCrIII) by means of the Somatic Mutation and Recombination Test (SMART Test) on Drosophila melanogaster Meigen, 1830 (Diptera: Drosophilidae) wings. Larvae resulting from standard crosses (ST) and high metabolic bioactivation (HB), treated with PAH and with HCrIII at concentrations 16.66 mg/mL, 8.33 mg/mL, and 4.16 mg/mL. As positive and negative controls, urethane and dodecyl sulfate sodium (SDS) were used, respectively. The frequencies of the different categories of mutant spots observed in offspring of HAP (HAP) and HCrIII treated crosses were not significantly different from those observed in the negative control. These data show that pure and chromium-doped (Cr+³) nanoestructured hydroxyapatite do not exhibit mutagenicity.

scholarly journals Evaluation of Cytotoxic and Mutagenic Effects of the Synthetic Cathinones Mexedrone, α-PVP and α-PHP

2021 ◽  
Vol 22 (12) ◽  
pp. 6320
Author(s):  
Monia Lenzi ◽  
Veronica Cocchi ◽  
Sofia Gasperini ◽  
Raffaella Arfè ◽  
Matteo Marti ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Metabolic Activation ◽  
Fold Increase ◽  
Synthetic Cathinones ◽  
The Other ◽  
Oxygen Species ◽  
Genetic Damage ◽  
Mutagenic Potential ◽  
Tk6 Cells ◽  
Mutagenic Effects

Mexedrone, α-PVP and α-PHP are synthetic cathinones. They can be considered amphetamine-like substances with a stimulating effect. Actually, studies showing their impact on DNA are totally absent. Therefore, in order to fill this gap, aim of the present work was to evaluate their mutagenicity on TK6 cells. On the basis of cytotoxicity and cytostasis results, we selected the concentrations (35–100 µM) to be used in the further analysis. We used the micronucleus (MN) as indicator of genetic damage and analyzed the MNi frequency fold increase by flow cytometry. Mexedrone demonstrated its mutagenic potential contrary to the other two compounds; we then proceeded by repeating the analyzes in the presence of extrinsic metabolic activation in order to check if it was possible to totally exclude the mutagenic capacity for α-PVP and α-PHP. The results demonstrated instead the mutagenicity of their metabolites. We then evaluated reactive oxygen species (ROS) induction as a possible mechanism at the basis of the highlighted effects but the results did not show a statistically significant increase in ROS levels for any of the tested substances. Anyway, our outcomes emphasize the importance of mutagenicity evaluation for a complete assessment of the risk associated with synthetic cathinones exposure.

scholarly journals Evaluation of ionic degradation and slot corrosion of metallic brackets by the action of different dentifrices

2013 ◽  
Vol 18 (1) ◽  
pp. 86-93
Author(s):  
Gustavo Antônio Martins Brandão ◽  
Rafael Menezes Simas ◽  
Leandro Moreira de Almeida ◽  
Juliana Melo da Silva ◽  
Marcelo de Castro Meneghim ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Artificial Saliva ◽  
Positive Control ◽  
Negative Control ◽  
Sem Analysis ◽  
Wilcoxon Test ◽  
Surface Polishing ◽  
Aluminium Ion ◽  
Negative Controls

OBJECTIVE: To evaluate the in vitro ionic degradation and slot base corrosion of metallic brackets subjected to brushing with dentifrices, through analysis of chemical composition by Energy Dispersive Spectroscopy (EDS) and qualitative analysis by Scanning Electron Microscopy (SEM). METHODS: Thirty eight brackets were selected and randomly divided into four experimental groups (n = 7). Two groups (n = 5) worked as positive and negative controls. Simulated orthodontic braces were assembled using 0.019 x 0.025-in stainless steel wires and elastomeric rings. The groups were divided according to surface treatment: G1 (Máxima Proteção Anticáries®); G2 (Total 12®); G3 (Sensitive®); G4 (Branqueador®); Positive control (artificial saliva) and Negative control (no treatment). Twenty eight brushing cycles were performed and evaluations were made before (T0) and after (T1) experiment. RESULTS: The Wilcoxon test showed no difference in ionic concentrations of titanium (Ti), chromium (Cr), iron (Fe) and nickel (Ni) between groups. G2 presented significant reduction (p < 0.05) in the concentration of aluminium ion (Al). Groups G3 and G4 presented significant increase (p < 0.05) in the concentration of aluminium ion. The SEM analysis showed increased characteristics indicative of corrosion on groups G2, G3 and G4. CONCLUSION: The EDS analysis revealed that control groups and G1 did not suffer alterations on the chemical composition. G2 presented degradation in the amount of Al ion. G3 and G4 suffered increase in the concentration of Al. The immersion in artificial saliva and the dentifrice Máxima Proteção Anticáries® did not alter the surface polishing. The dentifrices Total 12®, Sensitive® and Branqueador® altered the surface polishing.

scholarly journals Assessment of the Mutagenic Activity of Extracts of Brazilian Propolis in Topical Pharmaceutical Formulations on Mammalian CellsIn VitroandIn Vivo

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Juliana Marques Senedese ◽  
Aline Rafaela Rodrigues ◽  
Michelle Andrade Furtado ◽  
Viviane Dias Faustino ◽  
Andresa A. Berretta ◽  
...  
Keyword(s):  
Chromosomal Aberrations ◽  
Mutagenic Activity ◽  
Biological Activities ◽  
Antioxidant Properties ◽  
Test System ◽  
Negative Control ◽  
Continuous Treatment ◽  
Mutagenic Potential ◽  
Topical Formulations

Propolis possesses various biological activities such as antibacterial, antifungal, anti-inflammatory, anesthetic and antioxidant properties. A topically applied product based on Brazilian green propolis was developed for the treatment of burns. For such substance to be used more safely in future clinical applications, the present study evaluated the mutagenic potential of topical formulations supplemented with green propolis extract (1.2, 2.4 and 3.6%) based on the analysis of chromosomal aberrations and of micronuclei. In thein vitrostudies, 3-h pulse (G1phase of the cell cycle) and continuous (20 h) treatments were performed. In thein vivoassessment, the animals were injured on the back and then submitted to acute (24 h), subacute (7 days) and subchronic (30 days) treatments consisting of daily dermal applications of gels containing different concentrations of propolis. Similar frequencies of chromosomal aberrations were observed for cultures submitted to 3-h pulse and continuous treatment with gels containing different propolis concentrations and cultures not submitted to any treatment. However, in the continuous treatment cultures treated with the 3.6% propolis gel presented significantly lower mitotic indices than the negative control. No statistically significant differences in the frequencies of micronuclei were observed between animals treated with gels containing different concentrations of propolis and the negative control for the three treatment times. Under the present conditions, topical formulations containing different concentrations of green propolis used for the treatment of burns showed no mutagenic effect in either test system, but 3.6% propolis gel was found to be cytotoxic in thein vitrotest.

slowly growing natural populations. Various approaches have been adopted in order to improve the sensitivity. These have included the use of multiple probes labelled with a single fluor (Lee et al. 1993); or labelled with multiple fluors (Trebesius et al. 1994) and enzyme-linked probes or detection systems that allow signal amplification (Lebaron et al. 1997, Schonhuber et al. 1999). The latter indirect approach not only has the potential for signal amplification, but may also be used in natural samples showing high levels of autofluorescence. Any thorough identification method has to include positive and negative controls. False-positive results may either be caused by cells emitting autofluorescence upon excitation or by nonspecific binding of the probe to nontarget cells. Samples should therefore be checked for autofluorescence before hybridization and a negative control with a fluorescent oligonucleotide not complementary to rRNA has to be applied to check for sequence-independent nonspecific binding. Such non-specific binding may be due to interaction of the dye compound of the probe with hydrophobic cell components. Failures to detect cells containing target sequences (false-negatives) may originate from cells with either low cellular ribosome content or limited permeability of the cell periphery for the fluorescent probe (Manz et al. 1992). With the rapidly expanding database of 16S rRNA sequences, the problem of probe specificity has become more apparent and the design of probes is becoming increasingly difficult. These problems are also applicable to PCR and other oligonucleotide-dependent techniques. The problem of probe specificity may be overcome by using multiple specific oligonucleotide probes targeting different sites on the rRNA molecule and labelled with different fluorochromes. While a single oligonucleotide target sequence may be found in a number of related taxa, the probability that target sites for three designed oligonucleotides are found in a nontarget organism is, however, much reduced.

2003 ◽  
pp. 232-232
Keyword(s):  
Signal Amplification ◽  
Specific Binding ◽  
Natural Populations ◽  
Negative Control ◽  
Target Sequence ◽  
Cell Periphery ◽  
Nonspecific Binding ◽  
Detection Systems ◽  
Cell Components ◽  
Negative Controls

scholarly journals Effect of Sodium Carboxymethylcellulose and Sorbitol on Anti-Peptic Ulcer Activity of Anredera cordifolia Leaves Extract

2019 ◽  
Vol 4 (1) ◽  
pp. 16
Author(s):  
Maria Ulfah ◽  
Revika Rachmaniar ◽  
Egi MR. Sudrajat ◽  
Rida W. Fadla ◽  
Hary S. Pinuji
Keyword(s):  
Body Weight ◽  
Peptic Ulcer ◽  
Normal Control ◽  
Wistar Rat ◽  
Positive Control ◽  
Negative Control ◽  
Sodium Carboxymethylcellulose ◽  
Freeze Dried ◽  
Male Wistar Rats ◽  
Negative Controls

Anredera cordifolia or binahong is one of the Indonesian medicinal plants that is used to treat peptic ulcer. The purpose of this study was to evaluate the effect of the addition of sodium carboxymethylcellulose (CMC) and sorbitol on anti-peptic ulcer activity of A. cordifolia leaves extracts in male Wistar rats. The plants were extracted using decoction method and freeze dried. Three liquid formulas were used i.e., i) a combination of sodium CMC and sorbitol; ii) only sorbitol; iii) extract only. The rats were divided into 6 groups, i.e., positive control (sucralfate 35 mg/kg body weight); negative control (80% ethanol); normal control; and 3 formulas. After the administration of the liquid formula, all groups, except normal control, were given 80% ethanol (l5 ml/kg body weight) to induce peptic ulcer. Antipeptic ulcer activity was evaluated using direct observation on rats gastric mucosa, and histopathology assessment. The result showed that the strongest anti-peptic ulcer  was shown by sorbitol only (96.95% inhibition),  followed by the combination of sodium CMC and sorbitol (92.68% inhibition). The formula which only contained extract showed only  31.70% inhibition.  Statistical analysis showed significant differences between formula 1 and 2 with negative controls. In conclusion, A. cordifolia leaves extract with the addition of sorbitol showed the strongest anti-peptic ulcer activity. Keyword: Anredera cordifolia, peptic ulcer, suspense, Wistar rat.

Abstract 2819: Cross-correlation Analysis of Myocardial Velocity is Superior to Conventional Time-to-Peak Parameters for Quantifying Left Ventricular Dyssynchrony

Circulation ◽  
2007 ◽  
Vol 116 (suppl_16) ◽  
Author(s):  
Brandon K Fornwalt ◽  
Takeshi Arita ◽  
Mohit Bhasin ◽  
George Voulgaris ◽  
John D Merlino ◽  
...  
Keyword(s):  
Cross Correlation ◽  
Positive Control ◽  
Negative Control ◽  
Left Ventricular ◽  
Left Ventricular Dyssynchrony ◽  
Control Group ◽  
Time To Peak ◽  
Data Points ◽  
Negative Controls ◽  
Threshold Line

Background- A recent study showed that the most commonly used Tissue Doppler imaging (TDI) parameters to diagnose left ventricular dyssynchrony agree only 50% of the time. Most of these parameters require calculation of the ``time-to-peak” myocardial velocity. This ``time-to-peak” based analysis utilizes only one of >100 data points collected per heart cycle. Methods- We developed and tested a new dyssynchrony parameter, cross-correlation delay (XCD), that utilizes all velocity data points from 3 consecutive beats (~420 points). We hypothesized that XCD would be superior to existing methods at diagnosing dyssynchrony. We tested XCD on 11 members of a positive control group (echocardiographic responders to cardiac resynchronization therapy) and 12 members of a negative control group (normal echocardiogram and 12-lead ECG). We compared XCD to septal-to-lateral delay in time-to-peak (SLD), maximum difference in the basal 2- or 4-chamber times-to-peak (MaxDiff) and standard deviation of the 12 basal and mid-wall times-to-peak (Ts-SD). Results- An XCD threshold of 31ms discriminated between positive and negative controls with 100% sensitivity and specificity (Figure 1 ). SLD, MaxDiff and Ts-SD showed sensitivities of 36, 55 and 100% and specificities of 50, 42 and 50%, respectively. ROC analysis showed XCD and Ts-SD were superior to SLD and MaxDiff in discriminating between positive and negative controls (p<0.01). XCD was the only parameter which decreased after resynchronization in the positive controls (from 160±88ms to 69±61ms, p=0.003). Conclusion- XCD is superior to existing parameters at discriminating patients with LV dyssynchrony from those with normal function. Figure 1. XCD shows the greatest discrimination between positive and negative controls. Dyssynchrony values for each positive control are shown as x’s and values for each negative control are shown as circels. Different dyssynchrony parameters are shown in each subplot (A-D). Threshold values to diagnose dyssynchrony are plotted as horizontal lines in each figure. Note that x’s above the threshold line represent false positives while circles below the threshold line represent false negatives.

scholarly journals Essential oils as tick repellents on clothing

2019 ◽  
Vol 79 (2) ◽  
pp. 209-219 ◽  
Author(s):  
Oliver Soutar ◽  
Freya Cohen ◽  
Richard Wall
Keyword(s):  
Essential Oils ◽  
No Reduction ◽  
Positive Control ◽  
Negative Control ◽  
Tick Abundance ◽  
Spearmint Oil ◽  
Oregano Oil ◽  
Negative Controls ◽  
Tick Repellents

Abstract Essential oils show promise as natural alternatives to synthetic tick repellents, but few studies have investigated their repellent efficacy in vivo or under field conditions. Here, blanket-drags and standardised walks were employed to evaluate tick acquisition by 1 m2 cotton blankets or cotton trousers, respectively, in woodland edge habitats of known high tick abundance. Blankets and trousers had been treated with one of 5% oregano, rosemary, spearmint or thyme oils, 20% DEET (N,N-diethyl-3-methylbenzamide) (positive control) or ethanol excipient-only (negative control). The number of ticks present on the blankets or trousers differed significantly between treatments: spearmint oil treatments resulted in significantly fewer ticks than the negative controls for both blankets and trousers and significantly fewer ticks were present on the oregano oil treated blankets. For ticks that did attach to the trousers, the rate of drop off within 3 min was significantly higher for trousers treated with spearmint oil or thyme oil than ethanol, oregano oil and rosemary oil. No reduction in repellence was detected over a 24 h period between treatment and testing. The results suggest that 5% oregano and spearmint oils exhibit potential as natural clothing repellents, with an effective equivalence to 20% DEET.

scholarly journals Antimicrobial Activity of an Amnion-Chorion Membrane to Oral Microbes

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
Haroon Ashraf ◽  
Kerri Font ◽  
Charles Powell ◽  
Michael Schurr
Keyword(s):  
Bacterial Species ◽  
Healing Process ◽  
Antimicrobial Properties ◽  
Positive Control ◽  
Negative Control ◽  
Collagen Membrane ◽  
Wound Healing Process ◽  
Bacterial Strains ◽  
Oral Microbes ◽  
Negative Controls

Objective. The aim of this study was to evaluate wound biomodification by assessing antimicrobial properties present within a human-derived composite amnion-chorion membrane (ACM). Methods. Membranes analyzed were the human-derived ACM BioXclude™ and the porcine-derived collagen membrane Bio-Gide®. Paper discs with and without tetracycline served as positive and negative controls, respectively. The same number of colony-forming units per milliliter for each bacterial species (Aggregatibacter actinomycetemcomitans, Streptococcus mutans, and Streptococcus oralis) was inoculated on each of the discs. Discs from each group were removed at 12 and 24 hours and sonicated to remove the bacteria off the membranes. A serial dilution was performed to quantify bacterial growth. Results. The ACM inhibited growth at all time points, with all bacterial strains, identical to the negative control tetracycline discs. The collagen membrane and positive controls did not inhibit growth of any of the bacterial species throughout the 24-hour study period. P<0.05 for microbial growth on ACM or negative control vs. either collagen membrane or positive control. Conclusion. ACM was proven to be as bactericidal as paper discs inoculated with tetracycline at its minimum bactericidal concentration. The ACM bactericidal property may be beneficial in the early wound healing process.

scholarly journals KULIT BUAH JERUK LIMAU (Citrus amblycarpa (Hassk.) Osche) SEBAGAI ANALGESIK

Jurnal Kimia ◽  
2020 ◽  
pp. 24
Author(s):  
R. A. I. K. Maharani ◽  
N. K. Cahyaningsih ◽  
M. D. Abimanyu ◽  
K. W. Astuti
Keyword(s):  
Body Weight ◽  
Analgesic Activity ◽  
Treatment Options ◽  
Ethanol Extract ◽  
Positive Control ◽  
Negative Control ◽  
Fruit Peel ◽  
Hot Plate ◽  
Inflammatory Drugs ◽  
Negative Controls

Nonsteroidal anti-inflammatory drugs (NSAIDs) are the treatment options for relieving pain. However, long-term use can trigger gastrointestinal bleeding. Therefore, alternative analgesics which have the same therapeutic effect with lower side effects are needed. Limau (Citrus amblycarpa) is an empirical drug for tingling and cramping. The aim of the study is to determine the analgesic activity of ethanol extract of C. amblycarpa fruit peel. The method used in testing analgesic activity is the Hot Plate method. The study was conducted by dividing 30 mice into 6 groups. The group given CMC-Na 1% was used as a negative control, the group given suspension of sodium diclofenac dose of 6.5 mg/kg of body weight was used as a positive control, and the group given suspension of ethanol extract of C. amblycarpa fruit peel with dose variations 100, 300 and 600 mg/kg of body weight. The test animals were placed on top of the Hot Plate with a temperature of 70°C at 30 minutes after giving suspension test and the response time of mice to heat was observed every 30 minutes for 3 hours with cut off time 15 second. Based on the test results, it can be concluded that the administration of ethanol extract of C. amblycarpa fruit peel with 100, 300 and 600 mg/kg of body weight gave analgesic activity on mice compared to the negative controls (CMC-Na 1%).   Keywords: C. amblycarpa, Fruit Peel, Analgesics, Hot Plate 

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