RESUMEN
The piezoelectric effect is widely known to have a significant physiological function in bone development, remodeling, and fracture repair. As a well-known piezoelectric material, barium titanate is particularly appealing as a scaffold layer to improve bone tissue engineering applications. Currently, the chemical bath deposition method is used to prepare green synthesized barium titanate coatings to improve mechanical and biological characteristics. Molarity of the solutions, an essential parameter in chemical synthesis, is changed at room temperature (0.1-1.2 Molar) to prepare coatings. The XRD spectra for as deposited coatings indicate amorphous behavior, while polycrystalline nature of coatings is observed after annealing (300 °C). Coatings prepared with solutions of relatively low molarities, i.e. from 0.1 to 0.8 M, exhibit mixed tetragonal - cubic phases. However, the tetragonal phase of Perovskite barium titanate is observed using solution molarities of 1.0 M and 1.2 M. Relatively high value of transmission, i.e. â¼80%, is observed for the coatings prepared with high molarities. Band gap of annealed coatings varies between 3.47 and 3.70 eV. For 1.2 M sample, the maximum spontaneous polarization (Ps) is 0.327x10-3 (µC/cm2) and the residual polarization (Pr) is 0.072x10-3 (µC/cm2). For 1.2M solution, a high hardness value (1510 HV) is recorded, with a fracture toughness of 28.80 MPam-1/2. Low values of weight loss, after dipping the coatings in simulated body fluid, is observed. The antibacterial activity of BaTiO3 is tested against E. coli and Bacillus subtilis. Drug encapsulation capability is also tested for different time intervals. As a result, CBD-based coatings are a promising nominee for use as scaffold and protective coatings.
Asunto(s)
Escherichia coli , Óxidos , Bario/química , Titanio/farmacología , Titanio/químicaRESUMEN
A wide range of bioactive materials have been investigated for tissue engineering and regeneration. Barium titanate is a promising smart material to be used as scaffold for bone tissue engineering. Barium titanate coatings are prepared in the present study using chemical bath deposition technique. Coatings are prepared at room temperature with the variation in solution molarity from 0.1 to 1.2 M. Perovskite tetragonal phase is observed after annealing the samples at 300 °C using 1.0-1.2 M solutions. Normal-anomalous dielectric response is observed for annealed coatings. Maximum transmission of â¼55% and â¼82% is observed under as-prepared and annealed coatings, respectivly. Variation in direct band gap, i.e. 3.45-3.64 eV, is observed with varying molarity. High hardness of the coatings (â¼1180 HV) is observed at 1.2M with fracture toughness of â¼22 MPam-1/2. Biodegradation studies show smaller values of weight loss even after immersion in simulated body fluid (SBF) after 26 weeks. Barium titanate coatings also show high antioxidant activity. BaTiO3's antibacterial reaction is evaluated against microorganisms such as Escherichia coli (E. coli) and Staphylococcus aureus. Antibacterial activity shows highest zone of inhibition (â¼31 mm) against Staphylococcus aureus bacteria. Quantitative real-time PCR is used to assess the gene expression profile in cultivated cells. Thus, coatings produced without the use of hazardous solvents/reagents utilizing CBD technique are a potential material for biomedical applications.
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Materiales Biocompatibles Revestidos , Escherichia coli , Materiales Biocompatibles Revestidos/farmacología , Materiales Biocompatibles Revestidos/química , Bario , Antibacterianos/farmacología , Antibacterianos/químicaRESUMEN
Corneal collagen crosslinking (CXL) is a commonly used minimally invasive surgical technique to prevent the progression of corneal ectasias, such as keratoconus. Unfortunately, riboflavin/UV-A light-based CXL procedures have not been successfully applied to all patients, and result in frequent complications, such as corneal haze and endothelial damage. We propose a new method for corneal crosslinking by using a Ruthenium (Ru) based water-soluble photoinitiator and visible light (430 nm). Tris(bipyridine)ruthenium(II) ([Ru(bpy)3]2+) and sodium persulfate (SPS) mixture covalently crosslinks free tyrosine, histidine, and lysine groups under visible light (400-450 nm), which prevents UV-A light-induced cytotoxicity in an efficient and time saving collagen crosslinking procedure. In this study, we investigated the effects of the Ru/visible blue light procedure on the viability and toxicity of human corneal epithelium, limbal, and stromal cells. Then bovine corneas crosslinked with ruthenium mixture and visible light were characterized, and their biomechanical properties were compared with the customized riboflavin/UV-A crosslinking approach in the clinics. Crosslinked corneas with a ruthenium-based CXL approach showed significantly higher young's modulus compared to riboflavin/UV-A light-based method applied to corneas. In addition, crosslinked corneas with both methods were characterized to evaluate the hydrodynamic behavior, optical transparency, and enzymatic resistance. In all biomechanical, biochemical, and optical tests used here, corneas that were crosslinked with ruthenium-based approach demonstrated better results than that of corneas crosslinked with riboflavin/ UV-A. This study is promising to be translated into a non-surgical therapy for all ectatic corneal pathologies as a result of mild conditions introduced here with visible light exposure and a nontoxic ruthenium-based photoinitiator to the cornea. STATEMENT OF SIGNIFICANCE: Keratoconus, one of the most frequent corneal diseases, could be treated with riboflavin and ultraviolet light-based photo-crosslinking application to the cornea of the patients. Unfortunately, this method has irreversible side effects and cannot be applied to all keratoconus patients. In this study, we exploited the photoactivation behavior of an organoruthenium compound to achieve corneal crosslinking. Ruthenium-based organic complex under visible light demonstrated significantly better biocompatibility and superior biomechanical results than riboflavin and ultraviolet light application. This study promises to translate into a new fast, efficient non-surgical therapy option for all ectatic corneal pathologies.
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Queratocono , Fotoquimioterapia , Rutenio , Animales , Bovinos , Colágeno/farmacología , Córnea/patología , Reactivos de Enlaces Cruzados/farmacología , Humanos , Queratocono/tratamiento farmacológico , Queratocono/patología , Fármacos Fotosensibilizantes/farmacología , Fármacos Fotosensibilizantes/uso terapéutico , Riboflavina/farmacología , Rutenio/farmacología , Rayos UltravioletaRESUMEN
The present study provides an updated species list of free-living marine nematodes reported from coastal India (Coasts and Islands) based on the thorough consultation of literature published from 1956 to 2022. This exercise resulted in a total of 617 valid species belonging to 266 genera, 48 families, 21 superfamilies and 9 orders. Class Chromadorea comprises 487 species represented by 205 genera, while class Enoplea includes 130 species belonging to 61 genera. The most common family was Xyalidae, with 76 species and the least common families having a single species each were represented by Aegialoalaimidae, Rhadinematidae, Aphanolaimidae, Rhabditidae, Pandolaimidae and Rhabdodemaniidae. The checklist provides a robust framework for the distribution and biogeography of free-living marine nematodes from the Indian waters and could be used to relate with marine ecosystems of other countries.
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Nematodos , Animales , Chromadorea , Ecosistema , India , Rhabditoidea , Lista de Verificación , Organismos AcuáticosRESUMEN
PURPOSE: Morphological and molecular description of a new species of Haematoloechus dehradunensis sp. nov. collected from the lungs of Euphlyctis cyanophlyctis (Schneider 1799) from Dehradun (Uttarakhand), India and reporting first record of H. singaporensis from India. METHODS: Digeneans were fixed in AFA (alcohol-formalin-acetic acid), stained with Borax's carmine, studied and photomicrographed with a BX53 DIC/BF Olympus research microscope. Molecular studies were done by DNA isolation using Qiagen, DNeasy® Blood and Tissue Kit and PCR amplification using r-DNA ITS-1 marker situated between 18S and 1.58S gene. RESULTS AND CONCLUSION: The new species is differentiated from other known species of Haematoloechus in having larger oral sucker, kidney-shaped ovary and oval-lobed testes. H. singaporensis collected from E. cyanophlyctis represents a first record for India and a new host record. ITS sequences submitted and compared at NCBI GenBank support the uniqueness of the new species.
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Anuros , Trematodos , Animales , Femenino , India , Pulmón , MicroscopíaAsunto(s)
Vesícula/etiología , Ficus/efectos adversos , Dermatosis del Pie/etiología , Hipopigmentación/etiología , Trastornos por Fotosensibilidad/diagnóstico , Trastornos por Fotosensibilidad/patología , Crema para la Piel/efectos adversos , Anciano , Biopsia , Técnica del Anticuerpo Fluorescente Directa , Dermatosis del Pie/patología , Humanos , Masculino , Luz Solar/efectos adversosRESUMEN
Demand of bioactive materials that may create a bacteria-free environment while healing and regenerating the defect area is increasing day by day. Zirconia is a very interesting material because of its biocompatibility and high fracture toughness. In this research work, zirconia nanoparticles (NPs) have been synthesized using sol-gel method. Molarity of sols is varied in the range of 25 to 125 mM. The effect of acidic and basic nature of sols is studied by maintaining acidic (2) and basic (9) pH. As-synthesized NPs are made soluble in deionized (DI) water using tangerine drops. Dissolved NPs are spin coated onto glass substrate prior to characterization. Pure tetragonal phase, observed under all conditions using basic medium (pH 9), is accompanied by smaller crystallite size and unit cell volume. Presence of stabilized zirconia phase leads to higher value of density and higher mechanical strength. Nanodendrites with distinct features are observed for the sample prepared with high molarity using basic medium. Whereas, soft agglomerated nanodendrites are observed using acidic medium. Optical properties show transmission of 60-80% in the visible and infrared regions for acidic based samples and ~84% for basic samples. Direct energy band gap is varied from 4.96 eV to 5.1 eV in acidic (pH 2) and 4.91 eV to 4.97 eV in basic (pH 9) media. FTIR spectra show the formation of fundamental tetragonal band at 490 cm-1 for basic samples. Antibacterial response of zirconia is tested against E. coli, Streptococcus and Bacillus bacteria. Human teeth, bare and zirconia coated, are tested for their possible weight loss after dipping in various beverages. Zirconia coated tooth shows negligible degradation in hardness and weight after 24 hr dipping period. Thus, coatings prepared using water soluble zirconia (WSZ) nanoparticles, without the use of toxic solvents/reagents, are promising material to be used as protective coatings in biomedical applications.
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Escherichia coli , Nanopartículas , Dureza , Humanos , Ensayo de Materiales , Propiedades de Superficie , CirconioRESUMEN
Use of ceramic coatings has increased dramatically in orthopedics by improving their wear resistance and consequent long-term stability. Such stability involves not only the strength of material but also its resistance toward bacterial attacks. Amongst all ceramics, zirconia is selected in the present study due to its white color and high value of hardness making it a potential candidate to be used as implants and their coatings. In the present study effect of varying microwave powers (i.e. 100W, 200W, 300W, 400W, 500W, 600W, 700W, 800W, 900W and 1000W) on sol-gel synthesized glucose and fructose added zirconia coatings has been investigated. Formation of mixed tetragonal - monoclinic phases has been observed at relatively low microwave powers, i.e. 100-500W. However, at 600-1000W phase pure tetragonal zirconia is observed without any post heat treatment. FTIR analysis confirms formation of tetragonal phase of zirconia at 600-1000W microwave power. XPS results confirm the binding energies of Zr 3d and O 1s of microwave assisted zirconia coatings. High value of transmittance, i.e. ~90%, is observed at higher microwave powers. Variation in microwave powers is observed to tune the energy band gap of zirconia coatings in the range of 4.2-5.1 eV. Dielectric constant of 8-10 at log f = 4 is observed. High value of hardness and fracture toughness i.e. 1231 HV and 24.85 MPam-1/2, respectively, is observed for stabilized tetragonal zirconia coatings. Stabilized glucose fructose added zirconia shows strong antioxidant activity. Zirconia coatings are tested against Staphylococcus aureus bacteria for their potential application to treat bone infection. Results suggest that stabilized tetragonal zirconia can be successfully employed for orthopedic coatings.
Asunto(s)
Fructosa , Glucosa , Antibacterianos , Cerámica , Ensayo de Materiales , CirconioRESUMEN
INTRODUCTION: Gyrinicola dehradunensis sp. nov. from the intestine of tadpoles of the small paa frog, Nanorana minica, from Dehradun (Uttarakhand), India is described and illustrated. Gyrinicola dehradunensis is the first species of the genus recorded from India and the second species recorded from Asia. METHODS: Light microscopy was used for the identification of nematodes using BX53 DIC/BF Olympus research microscope with an attached DP27 digital camera. Drawings for the description of the new species were made from photomicrographs. For molecular studies, DNA was isolated using Qiagen, DNeasy® Blood and Tissue Kit and amplified using r-DNA ITS-18S, and ITS-1.58S primers. RESULTS: The new species is differentiated from the known species by the absence of larvated eggs and the presence of a tooth-like projection in the buccal region. N. minica is a new host record for the genus. Four r-DNA ITS1 sequences of the new species have been submitted to the NCBI Genbank.
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Anuros/parasitología , Larva/parasitología , Nematodos/anatomía & histología , Nematodos/clasificación , Animales , ADN de Helmintos/genética , Femenino , India , Microscopía , Nematodos/aislamiento & purificaciónRESUMEN
Rhabdias garhwalensis sp. nov. from the lungs of Duttaphrynus himalayanus (Günther, 1864) collected in Kimoi Tehsil, district Tehri Garhwal (Uttarakhand), India is described and illustrated. Rhabdias garhwalensis sp. nov. represents the 15th species described from the Oriental zoogeographical zone and the 9th species from India. The new species is differentiated from the closely related Oriental species in having 6 lips, cup-shaped buccal cavity with muscular striations in the posterior region and smaller esophagus to body length ratio. In addition to the new species, a second species, Cosmocercoides bufonis Karve, 1944, was found in the large intestine of D. himalayanus.
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Bufonidae/parasitología , Infecciones por Strongylida/veterinaria , Strongyloidea/clasificación , Animales , Femenino , India/epidemiología , Intestino Grueso/parasitología , Pulmón/parasitología , Masculino , Prevalencia , Infecciones por Strongylida/epidemiología , Infecciones por Strongylida/parasitología , Strongyloidea/anatomía & histologíaRESUMEN
Testicular sonography has contributed greatly to the preoperative diagnosis of testicular torsion in the pediatric patient and is the mainstay for evaluation of acute scrotal pain. Despite its high sensitivity and specificity, both false-negative and false-positive findings occur. Presence of documented Doppler flow within the testis might be a dissuading factor for surgical exploration with resultant testicular loss in the false-negative cases. Our goal is to illustrate key sonographic features in the spectrum of testicular torsion with preserved testicular flow, and to describe how to differentiate testicular torsion from epididymitis in order to avoid the under-diagnosis of testicular torsion. We simplify the anatomy of the bell clapper testis. We also describe our sonographic protocol for testicular torsion and share valuable tips from our approach to challenging cases.
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Torsión del Cordón Espermático/diagnóstico por imagen , Ultrasonografía Doppler/métodos , Niño , Diagnóstico Diferencial , Humanos , Masculino , Sensibilidad y EspecificidadRESUMEN
Rhabdias stomatica sp. nov. from the lungs of Duttaphrynus stomaticus (Lutken, 1864) from Dehradun, Uttarakhand, India is described and illustrated. Rhabdias stomatica sp. nov. is the 16th species described from the Oriental biogeographical region and the 8th species from India. The new species is differentiated from the closely related Oriental species in having 4 weakly developed lips, a trapezoidal shaped buccal cavity, different position of nerve ring and in the esophagus/body length ratio. In addition, to the new species found in the lungs, mature specimens of Aplectana macintoshii (Stewart, 1914) Travassos, 1931 and larvae representing two unidentified species of nematode were found in the large intestine of the D. stomaticus.
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Bufonidae/parasitología , Pulmón/parasitología , Tylenchida/clasificación , Tylenchida/aislamiento & purificación , Estructuras Animales/anatomía & histología , Animales , Ascarídidos/clasificación , Ascarídidos/aislamiento & purificación , Biometría , India , Microscopía , Tylenchida/anatomía & histologíaRESUMEN
In the form of biofilms, bacteria exhibit more resistance to antibiotics. Biofilm formers can withstand severe conditions and the host's defense system. Therefore, it is necessary to search for effective biofilm inhibitors. In this study, we investigated the effect of a chloroform extract of turmeric on biofilm formation against antibiotic resistant bacteria. The extract exhibited its antibiofilm effect by altering adherence, motility, extracellular polymeric substance (EPS) production and cell surface hydrophobicity; important attributes of biofilm formation. Cell attachment assays indicated that a chloroform extract resulted in a 38.9-60.2% inhibition of cell adherence to a polystyrene surface, and a 44.5-58.3% inhibition to a glass surface. Static biofilm formation assays indicated that a chloroform extract resulted in a 23-74.5% reduction in biofilm formation. The chloroform extract inhibited flagella-directed swarming and swimming motility and pilus-directed twitching motility in a dose-dependent manner. In addition to repression of motility, a chloroform extract also significantly (p < 0.05) altered the hydrophobic behavior, and bacterial strains such as K. pneumoniae and E. cloacae exhibited hydrophilic behavior after the addition of the extract, as compared with control cells. The presence of the extract also significantly (p < 0.05) increased the detachment of biofilms by a surfactant as compared with controls. Fourier transformed infrared spectroscopy (FTIR) had indicated a loss of vital functional groups of polysaccharides and proteins from the EPS of cells treated with a chloroform extract. Gas chromatography mass spectrometry (GC-MS) analysis indicated the presence of many phytochemical constituents, mainly sesquiterpenes and fatty acid groups. These results clearly suggested that turmeric could affect multiple cellular activities in biofilm formers exhibiting antibiotic resistance by modulating adherence, EPS production, motility and surface hydrophobicity.
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Fenómenos Fisiológicos Bacterianos/efectos de los fármacos , Biopelículas/efectos de los fármacos , Cloroformo/química , Curcuma/química , Farmacorresistencia Bacteriana/efectos de los fármacos , Extractos Vegetales/farmacología , Antibacterianos/farmacología , Bacterias/efectos de los fármacos , Relación Dosis-Respuesta a Droga , Cromatografía de Gases y Espectrometría de Masas , Pruebas de Sensibilidad Microbiana , Polisacáridos Bacterianos/biosíntesis , Espectroscopía Infrarroja por Transformada de FourierRESUMEN
Parapharyngodon tuberculata sp. nov., Thelandros tuberculata sp. nov. and Thelandros dehradunensis sp. nov. (Nematoda: Pharyngodonidae) from the large intestine of a rock lizard, Laudakia tuberculata Gray, 1827), are described and illustrated. Parapharyngodon tuberculata sp. nov. is the 8th Oriental species and 59th species assigned to the genus Parapharyngodon and differs from other species of the genus by possessing 3 pairs of caudal papillae, an echinate cloacal lip, 112-115 µm spicule length and postbulbar ovary. Thelandros tuberculata sp. nov. is the 5th and Thelandros dehradunensis sp. nov. the 6th Oriental species, respectively, and they are the 40th and 41st species assigned to the genus Thelandros. They differ from other species of the genus in caudal papillae arrangement, length of spicules, and structure of the anterior end of the esophagus. We transfer Parapharyngodon arequipensis Calisaya and Cordova, 1997 to Thelandros arequipensis (Calisaya and Cordova, 1997) comb. n. based upon the presence of a terminal operculum in the egg and large, pendant, caudal papillae.
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Lagartos/parasitología , Nematodos/anatomía & histología , Nematodos/clasificación , Infecciones por Nematodos/veterinaria , Animales , India/epidemiología , Infecciones por Nematodos/epidemiología , Infecciones por Nematodos/parasitología , Especificidad de la EspecieAsunto(s)
Carcinoma Basocelular/patología , Neoplasias Cutáneas/patología , Adulto , Anciano , Anciano de 80 o más Años , Carcinoma Basocelular/cirugía , Proliferación Celular/fisiología , Femenino , Humanos , Masculino , Persona de Mediana Edad , Cirugía de Mohs , Estudios Prospectivos , Neoplasias Cutáneas/cirugía , Reino UnidoRESUMEN
We present the case of a 13-year-old girl with a recurrent urinary tract infection, malodorous vaginal discharge, and urinary incontinence caused by a retained vaginal foreign body. The foreign body, an aerosol cap retained for over 2 years, resulted in the formation of a ureterovaginal fistula, an extremely rare complication. The critical value of ultrasound and magnetic resonance urography in delineating the foreign body, the fistulous tract, and the intraperitoneal urine leak is described. Through this unique diagnostic dilemma, we wish to highlight that the evaluation of persistent unusual urinary symptoms and vaginal discharge in a young girl must include a thorough pelvic examination and focused imaging to look for retained vaginal foreign bodies.
RESUMEN
Chabaudus dehradunensis sp. nov. (Nematoda: Seuratoidea) from the large intestine of the water skipper, Euphlyctis cyanophlyctis (Anura, Dicroglossidae), from Dehrandun, India is described and illustrated. Chabaudus dehradunensis sp. nov. is the 6th species assigned to the genus and 1st species reported from India. It is separated from its congeners based upon the number and arrangement of caudal papillae and the length of spicule. Euphlyctis cyanophlyctis is the new host record for the genus Chabaudus.
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Anuros/parasitología , Nematodos/clasificación , Nematodos/aislamiento & purificación , Animales , India , Intestino Grueso/parasitología , Microscopía , Nematodos/anatomía & histologíaRESUMEN
Peritonsillar infections are one of the most common deep neck space infections, particularly in adolescents. Inaccurate diagnosis can lead to delay in management and potentially life-threatening complications. Contrast-enhanced computed tomography (CT) scan of the neck traditionally has been used to diagnose suspected peritonsillar abscess. With growing concern over radiation exposure, there has been increasing utilization of ultrasound (US) using intraoral and transcutaneous approaches. We chose the transcutaneous US technique due to its ease of performance in children. The purpose of this article is twofold: a) to describe our technique of performing transcutaneous US of the tonsil showing sonographic appearance of normal tonsil, highlighting pertinent anatomy and unique considerations for this modality in children, and b) to illustrate the sonographic findings in the spectrum of pediatric peritonsillar infections, which includes uncomplicated tonsillitis, peritonsillar cellulitis, small intratonsillar abscess and frank peritonsillar abscess. Parapharyngeal abscess can sometimes be detected.
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Absceso Peritonsilar/diagnóstico por imagen , Ultrasonografía/métodos , Niño , Medios de Contraste , Diagnóstico Diferencial , HumanosRESUMEN
Oral cancer is one of the most prevalent form of cancer and its severity is aggrandized specially among the socio-economically backward population in developing countries. A major fraction of patient population is unable to avail diagnosis for oral cancer due to scarcity of state-of-the-art infrastructure and experienced oral and maxillofacial pathologist. Contemporary gold standard of oral cancer confirmation relies on biopsy report. But biopsy is invasive and thus patients are usually reluctant to undergo this test. Moreover, biopsy yields considerable false negatives if investigated tissue is not collected precisely from the carcinogenic location. Till date, there is dearth of computer aided pre-screening tool for detection of oral cancer. The paper presents Digital Infrared Thermal Imaging as a viable modality for early screening of oral cancer. This is the pioneering attempt to discriminate normal subjects from patients by leveraging discriminating texture features on oral thermograms. Statistically significant texture features were selected from a) both halves of frontal face and b) right and left profile faces. Due to disparity of distribution of facial temperature between normal subjects and patients, the corresponding texture features form discriminative class specific local clusters. Such local conglomeration was exploited using k-means and fuzzy k-means clustering. We adopt the concept of cluster prototype classifier which assigns label to each cluster according to majority class labels within that cluster. Highest classification accuracy of 86.12% is attained on fusion of features from left and right half of frontal face of precancerous subject followed by fuzzy k-means guided cluster prototype classification. The proposed work outperforms our previously developed pre-screening framework by upto 6.5%. Such promising results boosts the viability of our approach.
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Diagnóstico por Computador/métodos , Neoplasias de la Boca/diagnóstico por imagen , Termografía/métodos , Adulto , Anciano , Área Bajo la Curva , Análisis por Conglomerados , Humanos , Procesamiento de Imagen Asistido por Computador , Persona de Mediana Edad , Neoplasias de la Boca/patología , Lesiones Precancerosas/diagnóstico por imagen , Lesiones Precancerosas/patologíaRESUMEN
Prosotocus punjabensis sp. nov. (Digenea, Pleurogenidae) from the intestine of the water skipper, Euphlyctis cyanophlyctis (Anura, Dicroglossidae), from Punjab, India is described and illustrated. Prosotocus punjabensis sp. nov. is the 13th Oriental species assigned to the genus and is separated from its congeners based upon the morphology of the vitellaria and cecal terminations. In addition, E. cyanophlyctis was found to harbour three species of Nematoda, Aplectana macintoshii, Cosmocerca kalesari and an unidentified species assigned to Cosmocerca.