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BACKGROUND: In-office three-dimensional (3D) printers and metal sleeveless surgical guides are becoming a major trend recently. However, metal sleeve-free designs are reported to be more prone to distortion which might lead to variation in the inner diameter of the drill hole and cause deviation and inaccuracy in the placement of the implant. Carbon fiber nanoparticles are reported to improve the properties of 3D printing resin material in industrial application. AIM: The purpose of the study is to evaluate and compare the wear resistance of 3D-printed implant guides with metal sleeve, sleeve-free, and reinforced sleeve-free resin to the guide drill. MATERIALS AND METHODS: A total of 66 samples with 22 samples in each group. Three groups including 3D-printed surgical guide with metal sleeve (Group A), without metal sleeve (Group B), an carbon fiber reinforced without metal sleeve (Group C) were included in the study. All samples were evaluated before sequential drilling and after sequential drilling using Vision Measuring Machine. The data were tabulated and statistically evaluated. RESULTS: The data obtained were statistically analyzed with one-way analysis of variance and posthoc test. The data obtained for wear observed in the samples showed that the wear was highest in Group B with a mean of 0.5036 ± 0.1118 and the least was observed in Group A with a mean of 0.0228 ± 0.0154 and Group C was almost similar to Group A with mean of 0.0710 ± 0.0381. The results showed there was a significant difference between Group B with Group A and C, respectively (P < 0.05). The results showed that there was no significant difference regarding the wear observed between Groups A and C (P > 0.05). CONCLUSION: The wear observed in the guide with a metal sleeve and carbon fiber reinforced without a metal sleeve was almost similar. The carbon fiber-reinforced guide showed better tolerance to guide drill equivalent to metal sleeve. Thus, carbon fiber nanoparticles reinforced in 3D printing resin have shown improved strength and can be used as a good replacement for a metal sleeve for an accurate placement of the implant.
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Impression tridimensionnelle , Test de matériaux/méthodes , Techniques in vitro , Métaux/composition chimique , Fibre de carbone/composition chimique , Résines synthétiques/composition chimique , Humains , Implants dentairesRÉSUMÉ
Quorum sensing (QS) is a molecular cell-cell communication utilized by several bacteria and some fungi. It involves cell density dependent gene expression that includes extra polymeric substance production, sporulation, antibiotic production, motility, competence, symbiosis and conjugation. These expressions were carried out by different signaling molecules like acyl homo-serine lactone (AHL) and auto-inducing peptides (AIPs) which was effluxed by gram negative and gram positive bacteria. Pathogenic bacteria and biofilms often exhibit high resistance to antibiotics, attributed to the presence of antibiotic efflux pumps, reduced membrane permeability, and enzymes that deactivate quorum sensing (QS) inhibitors. To counteract virulence and multi-drug resistance (MDR), novel strategies such as employing quorum sensing (QS) inhibitors and quorum quenchers are employed. It targets signaling molecules with synthesis and prevents the signal from binding to receptors. In this present review, the mechanisms of QS along with inhibitors from different sources are described. These strategies potentially interfere with QS and it can be applied in different fields, mainly in hospitals and marine environments where the pathogenic infections and biofilm formation are highly involved.
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Bactéries , Détection du quorum , Biofilms , Antibactériens/pharmacologie , Antibactériens/métabolisme , Bactéries à Gram positifRÉSUMÉ
We report on the superconducting properties and intermediate resistive steps (IRS) observed in the current-voltage characteristics (IVC) of tungsten meander (MW) structures fabricated using focused ion beam (FIB) technique. Three number of MWs were studied with individual wire widths of 240 nm, 640 nm and 850 nm with superconducting transition temperatures (TC) of 4.5 K, 4.55 K and 4.60 K respectively. The measured normal state resistance values at 8 K for these wires are of â¼182 kΩ, â¼49 kΩ and â¼32 kΩ, respectively as a function of increasing wire widths; are higher than the quantum of resistance (h/4e2=6.45kΩ,his a Planck constant andeis electronic charge) indicating extreme disorder nature of the fabricated samples. The variation of resistance with respect to temperature (forT
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Here, we report detailed lattice structure, magnetization (dc and ac) and specific heat measurements on a 3d-5dbased new triple-perovskite material Sr3CuIr2O9. The Sr/Cu forms a layered structure of triangular-lattice while the Ir forms Ir2O9dimers which lie in chain as well as simultaneously makes layered triangular-lattice with neighboring atoms. Due to random site-sharing with Sr2+, the Cu2+(3d9, spin-1/2) forms a diluted magnetic lattice, thus giving a disordered in-plane exchange interaction. Opposed to conventionalJeffmodel, the Ir5+(5d4,Jeff= 0) is believed to be magnetic here which participates both in-chain and in-plane magnetic interactions. This complex lattice structure driven competing exchange interaction leads the ground state to a gapless quantum-spin-liquid state which coexists with (weak) ferromagnetic spin correlations. While underling the importance of spin state (spin-1/2), we believe that the combined effect of lattice structure, geometric frustration, spin-orbit coupling and spin state has given rise this interesting ground state in this material.
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Aim: Antibiotics treat various diseases by targeting microorganisms by killing them or reducing their multiplication rate. New Delhi Metallo-beta-lactamase-1 (NDM-1) is produced by bacteria possessing the resistance gene blaNDM-1, the enzyme that makes bacteria resistant to beta-lactams. Bacteriophages, especially Lactococcus, have shown their ability to break down lactams. Hence, the current study computationally evaluated the binding potential of Lactococcus bacteriophages with NDM using Molecular docking and dynamics. Methods: Modelling of NDM I-TASSER for Main tail protein gp19 OS=Lactococcus phage LL-H or Lactobacillus delbrueckii subsp. lactis after downloading from UNIPROT ID- Q38344. Cluspro tool helps in Understanding cellular function and organization with protein-protein interactions. MD simulations(19) typically compute atom movements over time. Simulations were used to predict the ligand binding status in the physiological environment. Results: The best binding affinity score was found -1040.6 Kcal/mol compared to other docking scores. MD simulations show in RMSD values for target remains within 1.0 Angstrom, which is acceptable. The ligand-protein fit to receptor protein RMSD values of 2.752 fluctuates within 1.5 Angstrom after equilibration. Conclusions: Lactococcus bacteriophages showed a strong affinity to the NDM. Hence, this hypothesis, supported by evidence from a computational approach, will solve this life-threatening superbug problem.
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Background: The periodontal regeneration is the most challenging process which involves regeneration of both hard and soft tissues. There are various biomaterials available for this purpose. Tooth graft can be used as a regenerative material in the field of periodontics and implantology. The tooth graft with 70% demineralization is considered to be a better option for periodontal regeneration. Different methods are employed for demineralization of tooth using various acids. Materials and Methods: This study was designed as an in vitro study. Totally 60 teeth were collected and categorized into four groups. Groups I, II, and III teeth were demineralized in 2% nitric acid, 0.6 M hydrochloric acid, and 17% ethylenediaminetetraacetic acid (EDTA), respectively. The Group IV teeth were left undemineralized. The elements present in the various tooth graft groups after demineralization were analyzed by EDX-720 XRF Instrument. Results: The EDTA demineralized tooth graft has higher level of Calcium, Strontium, and Zinc content compared to other tooth graft groups and it was statistically significant with P = 0.001. Conclusion: The EDTA demineralized tooth graft can serve as better graft than 2% nitric acid and 0.6M hydrochloric acid demineralized and undemineralized tooth grafts.
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BACKGROUND AND OBJECTIVES: Epidermal growth factor receptor (EGFR) mutation analysis has become an important part of the initial workup of non-squamous non-small cell lung cancer (NS-NSCLC) patients. This study is attempted as South Indians population is comprised of ethnic groups with diverse genetic makeup and only very limited data on EGFR mutation is available from south India. A detailed understanding of EGFR mutation profile will help in better planning of treatment strategies and resource allocation. METHODS: A retrospective analysis of EGFR mutation frequency in 350 patients diagnosed with adenocarcinoma of lung and its association with pathological characteristics was done. RESULTS: Out of 350 cases of pulmonary adenocarcinoma, within an age group ranging from 30 to 86 years. EGFR mutations were identified in 34.8% (n = 122) cases, out of which 35.24% (n = 43) were in non-smoker females (P = 0.001). Of the 14 cases with resistant type of EGFR mutations, nine were in smoker males and the remaining five in non-smoker females. INTERPRETATION AND CONCLUSION: Overall EGFR mutation frequency observed in our study was similar to other Indian studies. However, in our study, we observed that mutation in exon 21 was less frequent compared to other studies. A similar slightly increased frequency of rare mutations and double mutations were observed in our study. A detailed study of the molecular epidemiology of lung cancer and its association with different geographical zones of India is needed. This understanding will help in better planning of treatment strategies and resource allocation.
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Adénocarcinome pulmonaire , Carcinome pulmonaire non à petites cellules , Tumeurs du poumon , Mâle , Femelle , Humains , Adulte , Adulte d'âge moyen , Sujet âgé , Sujet âgé de 80 ans ou plus , Carcinome pulmonaire non à petites cellules/anatomopathologie , Tumeurs du poumon/épidémiologie , Tumeurs du poumon/génétique , Tumeurs du poumon/anatomopathologie , Études rétrospectives , Récepteurs ErbB/génétique , Adénocarcinome pulmonaire/génétique , Inde/épidémiologie , MutationRÉSUMÉ
Obesity and its complications is one of the main issues in today's world and is increasing rapidly. A wide range of non-contagious diseases, for instance, diabetes type 2, cardiovascular, high blood pressure and stroke, numerous types of cancer, and mental health issues are formed following obesity. According to the WHO, Malaysia is the sixth Asian country with an adult population suffering from obesity. Therefore, identifying risk factors associated with obesity among Malaysian adults is necessary. For this purpose, this study strives to investigate and assess the risk factors related to obesity and overweight in this country. A quantitative approach was employed by surveying 26 healthcare professionals by questionnaire. Collected data were analyzed with the DEMATEL and Fuzzy Rule-Based methods. We found that lack of physical activity, insufficient sleep, unhealthy diet, genetics, and perceived stress were the most significant risk factors for obesity.
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Diabète de type 2 , Obésité , Adulte , Humains , Obésité/épidémiologie , Obésité/complications , Surpoids/épidémiologie , Logique floue , Diabète de type 2/épidémiologie , Facteurs de risqueRÉSUMÉ
The present work describes the synthesis and characterization of pyrene derivatives, N-(1-Pyrenoylmethyl) pyridinium bromide (PM-PB) and N-(1-Pyrenoylmethyl)-N,N,N-triethylammonium bromide (PM-TAB). The photophysical behavior of these molecules has been studied in various protic and aprotic solvents. Using steady state fluorescence intensity, fluorescence anisotropy and dynamic fluorescence lifetime studies, the sensitivity of these molecules towards the micellization process of bile salts has been monitored. These derivatives have been effectively used in estimating critical micellar concentration (CMC) of bile salt, sodium deoxycholate (NaDC).
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Acides et sels biliaires , Sels , Bromures , Acide désoxycholique , MicellesRÉSUMÉ
Early detection and appropriate treatment of newborn sepsis reduce mortality and morbidity. A rapid, inexpensive laboratory approach is needed to assess newborn sepsis, even though blood culture is the gold standard for diagnosis. To compare serial CRP and Total Leukocyte Count (WBC) with blood culture, this study aimed to evaluate the role of newborn sepsis. A total 148 neonates with clinical symptoms of sepsis were included .CRP was measured by quantitative immuno turbidimetric method andotal leukocyte count (WBC) was measured by automated cell counter. CRP1 and WBC1 were measured within 6 hours of clinical symptoms. CRP2 and WBC2 were measured after 48 hours of clinical symptoms. Sensitivity, specificity, PPV, NPV of CRP1 and CRP2,WBC 1and WBC 2 were compared with culture positive and negative sepsis.CRP 2 showed high sensitivity 96% and high NPV95% with significant p value <0.0001. WBC2 has high sensitivity (90.57%) and NPV (91%) with significant p value <0.0001. CRP 1 has sensitivity 83%and NPV 82.3%, with p value < 0.001.WBC1 has lowest sensitivity (62.2%) and NPV (71.4%) compared to all other parameters. Serial CRP and WBC measurements are useful in the diagnosis of neonatal sepsis. Measurement of CRP and Total Leukocyte Count (WBC) after 48 hours of clinical symptoms were considered promptly for diagnose neonatal sepsis.
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Background: Accidental electrocution was more common in animals and death was mostly due to shock and cardiac arrest. Survival of animals or humans could be possible if victims receive immediate medical support. Case description: A 3-year-old crossbred Jersey heifer was presented to the Emergency and Critical Care Medicine Referral Clinic of the Veterinary College and Research Institute, Orathanadu, with a history of accidental electrocution by broken high-tension overhead power transmission line during grazing in the paddy fields. The animal was dull and depressed, dark red, and some areas were charred in appearance on the dorsum and limbs. The animal showed difficulty walking due to the electrocution burn injury and was poorly responding to the surroundings. Clinical examination revealed subnormal temperature, polypnea, pale mucous membranes, ruminal atony, and arrhythmias on auscultation. Findings/treatment and outcome: On point of care (PoC) hematology testing, leukocytosis, neutrophilia, and microcytosis were observed. PoC electrolyte analysis revealed hypocalcemia (ionized calcium 0.89 mmol/L), mild hypochloremia, and severe hypokalemia (2.81 mmol/L). PoC biochemistry revealed hypoglycemia (41 mg/dl). PoC elevated levels of serum cardiac troponin (0.33 ng/dl) indicated cardiac damage. Aspartate aminotransferase (1794 U/L), CK-MB (699 U/L) and LDH (6.7 U/L) were also elevated. On PoC urinalysis, proteinuria, myoglobinuria, and glucosuria were observed. Evident clinical recovery, wound healing, and improvement in animal activities were observed. Conclusion: High-voltage electrocution injury is a serious type of accident with the potential risk of multi-organ damage and death. Early diagnosis of electrocution and immediate management enhances the expectancy of complete recovery.
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Disorder induced phase slip (PS) events appearing in the current voltage characteristics (IVCs) are reported for two-dimensional TiN thin films produced by a robust substrate mediated nitridation technique. Here, high temperature annealing of Ti/Si3N4 based metal/substrate assembly is the key to produce majority phase TiN accompanied by TiSi2 & elemental Si as minority phases. The method itself introduces different level of disorder intrinsically by tuning the amount of the non-superconducting minority phases that are controlled by annealing temperature (Ta) and the film thickness. The superconducting critical temperature (Tc) strongly depends on Ta and the maximum Tc obtained from the demonstrated technique is about 4.8 K for the thickness range ~ 12 nm and above. Besides, the dynamics of IVCs get modulated by the appearance of intermediated resistive steps for decreased Ta and the steps get more prominent for reduced thickness. Further, the deviation in the temperature dependent critical current (Ic) from the Ginzburg-Landau theoretical limit varies strongly with the thickness. Finally, the Tc, intermediate resistive steps in the IVCs and the depairing current are observed to alter in a similar fashion with Ta and the thickness indicating the robustness of the synthesis process to fabricate disordered nitride-based superconductor.
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As the epidemic of coronavirus disease (COVID-19) has spread rapidly, health organizations around the world has made wearing face mask obligatory to prevent the spread of the infections for the wellness of the society. As wearing face masks become a daily routine, the usage of cloth facemasks from textile fabric, is popular among the public. Since antiquity, textiles have been proven to be intertwined with human lives and the integrant of these crucial materials are fibers. Particularly, nanofiber fabrics manufactured by electrospinning have attracted attention, owing to the better filtration efficiency and breathability. In addition, the electrospinning process provide opportunities to fine tuning of the surface functionality through polymer chemistry and an encapsulation of bioactive agents in single step process. This review opens up a new horizon in possible textile applications especially, an active layer of bioactive agent (Curcumin and Moringa) loaded nanofibrous fabrics-based facemasks for day to day life.
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Security is the most critical issue amid transmission of medical images because it contains sensitive information of patients. Medical image security is an essential method for secure the sensitive data when computerized images and their relevant patient data are transmitted across public networks. In this paper, the dual encryption procedure is utilized to encrypt the medical images. Initially Blowfish Encryption is considered and then signcryption algorithm is utilized to confirm the encryption model. After that, the Opposition based Flower Pollination (OFP) is utilized to upgrade the private and public keys. The performance of the proposed strategy is evaluated using performance measures such as Peak Signal to Noise Ratio (PSNR), entropy, Mean Square Error (MSE), and Correlation Coefficient (CC).
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Algorithmes , Sécurité informatique , Imagerie diagnostique , Entropie , Humains , Rapport signal-bruitRÉSUMÉ
The present study was aimed to evaluate the antimicrobial activities of bioactive compounds synthesized from vermicast isolated actinomycetes species. Specifically, the synthesized bioactive compounds were evaluated for their antimicrobial activity against selected Gram + ve and Gram - ve human pathogenic bacteria including Staphylococcus aureus, Bacillus circulans, Bacillus subtilis, Pseudomonas aeruginosa, and Escherichia coli. Interestingly, a total of five different actinomycetes species were recovered from vermicasts. More interestingly, among these potential actinomycetes species, the bioactive compounds synthesized by isolate AS9 showed a significant antibacterial activity and its mean zone of inhibition was found at 11.3⯱â¯1.6â¯mm, 9.5⯱â¯0.91â¯mm, and 9.9⯱â¯1.71mm against S. aureus, B. subtilis, and B. circulans, respectively. Furthermore, according to antibacterial activity and spectrum broadness, three of the actinomycetes strains were selected and characterized by conventional methods. Subsequently, the bioactive compound profiling of these isolated actinomycetes strains performed through GC-MS analysis indicating the presence of the bioactive compounds including 3, octadecene (E), behnic alcohol phenol, 2,4-bis(1,1-dimethyl ethyl) 1-nonadecene, 1-heneicosanol, milbemycin 3-eicosene (E), and 1-docosanol.
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Actinobacteria/métabolisme , Antibactériens/pharmacologie , Actinobacteria/classification , Actinobacteria/isolement et purification , Antibactériens/isolement et purification , Bacillus/effets des médicaments et des substances chimiques , Bacillus subtilis/effets des médicaments et des substances chimiques , ADN bactérien/génétique , Escherichia coli/effets des médicaments et des substances chimiques , Escherichia coli/métabolisme , Chromatographie gazeuse-spectrométrie de masse , Inde , Phylogenèse , Pseudomonas aeruginosa/effets des médicaments et des substances chimiques , ARN ribosomique 16S/génétique , Spectroscopie infrarouge à transformée de Fourier , Staphylococcus aureus/effets des médicaments et des substances chimiquesRÉSUMÉ
OBJECTIVE: Dermatophytes are resistant to some available antibiotics. Development of new plant drugs to control drug resistant microbes is urgently needed. This study evaluates the antidermatophytic potential of 18 selected medicinal plants used by traditional healers in Theni and Virudhunagar Districts of Tamil Nadu, India. MATERIALS AND METHODS: Selected plant parts were collected, shade dried and powdered. Plant powders were extracted with ethanol and their antifungal potency was investigated against and clinical dermatophytes. The antioxidant effect of the extracts was screened using DPPH assay. Minimal Inhibitory Concentration (MIC) and Minimal Fungicidal Concentration (MFC) were estimated for the extracts. Ten plant extracts showed maximum MFC and they were selected to study their efficacy in interfering with ergosterol biosynthesis. Fluconazole-35µg/mL known fungicide was used as control. The most active extracts were taken for biocompatibility studies using 3T3-L1 fibroblast cell lines. RESULTS: The ethanol extract of Phyllanthus reticulates leaves showed good antifungal activity compared to other plant extracts. The MIC and MFC for Phyllanthus reticulatus were 62.5 and 250µg/mL against M. pachydermatitis and T. rubrum respectively. The ethanol extracts of Phyllanthus reticulatus, Coldenia procumbens, Thespesia populnea and Senna alata significantly lowered the release of ergosterol by 16.37, 19.53, 24.79, and 21.44%, respectively. The ethanol extract of Phyllanthus reticulatus leaves was more biocompatible to host cells than other active extracts. CONCLUSION: Our study indicated that the ethanol extract of Phyllanthus reticulates leaves showed promising activity against dermatophytes. It could be a potential material for future development of antidermatophytic agents.
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Antifongiques/pharmacologie , Arthrodermataceae/effets des médicaments et des substances chimiques , Ergostérol/antagonistes et inhibiteurs , Extraits de plantes/pharmacologie , Plantes médicinales/composition chimique , Antifongiques/composition chimique , Antioxydants/pharmacologie , Arthrodermataceae/isolement et purification , Arthrodermataceae/pathogénicité , Mycoses cutanées/traitement médicamenteux , Mycoses cutanées/microbiologie , Ergostérol/biosynthèse , Ergostérol/métabolisme , Éthanol/composition chimique , Humains , Inde , Médecine traditionnelle , Tests de sensibilité microbienne , Feuilles de plante/composition chimiqueRÉSUMÉ
Zinc oxide nanoparticles (ZnONPs) exhibit abundant biomedical applications. Anisotropic ZnONPs with a defined shape and size were synthesized using Bacillus megaterium (NCIM 2326) cell free extract as a bio-reductant. The study investigated the multidimensional effect of ZnONPs on Helicobacter pylori strains and assessed its biosafety in normal human mesenchymal stem cells (hMSc). The highly stable ZnONPs were produced using B. megaterium and Zinc nitrate as a precursor. The phase of ZnONPs formation and structural characterization were performed by UV- visible (UV-Vis), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) and Field Emission Scanning electron microscopy (FESEM) analysis. Furthermore, the ZnONPs exhibited higher biocompatibility against human mesenchymal stem cells (hMSC) and proved to be potentially safe in mammalian cells. Corroborating the current investigation, we described the anti-H. Pylori dosage of ZnONPs was safe to hMSC and could efficiently use as nano-antibiotic.
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Antibactériens/pharmacologie , Technologie de la chimie verte/méthodes , Nanoparticules métalliques/composition chimique , Oxyde de zinc/pharmacologie , Anisotropie , Antibactériens/composition chimique , Apoptose/effets des médicaments et des substances chimiques , Bacillus megaterium/métabolisme , Membrane cellulaire/effets des médicaments et des substances chimiques , Helicobacter pylori/effets des médicaments et des substances chimiques , Humains , Test de matériaux , Cellules souches mésenchymateuses/effets des médicaments et des substances chimiques , Nanoparticules métalliques/ultrastructure , Tests de sensibilité microbienne , Taille de particule , Espèces réactives de l'oxygène/métabolisme , Oxyde de zinc/métabolismeRÉSUMÉ
Probiotics are vital bacteria that colonize the intestine and modify its microflora with benefits for the host. Very few members of the Bacillus group are recognized as safe for use and hence only a few strains are available as commercial preparations for application in humans and animals. Acute and subacute studies in rats were conducted to establish safety of Bacillus clausii (B. clausii) UBBC07. In the acute toxicity study, the oral LD50 for B. clausii UBBC07 was found to be >5000 mg/kg (630 billion cfu/kg) body weight. The NOAEL for B. clausii UBBC07 was found to be 1000 (126 billion cfu) mg/kg body weight/day by oral route in the subacute toxicity study. There were no significant differences between control and treated groups in any of the endpoints assessed using an OECD443 or OECD407 protocol. B. clausii UBBC07 was found to be resistant to three antibiotics -clindamycin, erythromycin and chloramphenicol. Analysis of the whole genome sequence of B. clausii UBBC07 revealed that the antibiotic resistance genes are present in chromosomal DNA which is intrinsic and not transferable. Toxin genes were also found to be absent. These results suggest consumption of B. clausii UBBC07 is safe for humans.
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INTRODUCTION: Implant-supported prosthesis has high predictability and success and improves quality of life. This study aims at assessing awareness among the patients regarding implant-supported prosthesis. MATERIALS AND METHODS: A cross-sectional study was conducted among 391 study participants. A structured questionnaire was distributed to assess implant-related awareness among the study participants. The questionnaires were analyzed for the responses. RESULTS: Among the 391 respondents, 37.5% of the respondents reported having moderate knowledge regarding the tooth replacement options. Nearly 50% considered implants as a viable treatment option. The majority of them enlisted the dentist as the major source of information regarding implants, and media had a share of about 7.03% only. High cost was a major barrier in selecting implants as a treatment option. CONCLUSION: This survey showed that awareness among people was low regarding the dental implants. Efforts need to be directed to increase the awareness levels by utilizing media as a tool to achieve the target. CLINICAL SIGNIFICANCE: A patient who is aware of the advantages of the implant-supported dentures will make an informed decision for better functional stability and retention of the denture, especially in the mandibular arch.