Staging of Prostate Cancer Using Automatic Feature Selection, Sampling and Dempster-Shafer Fusion

A novel technique of automatically selecting the best pairs of features and sampling techniques to predict the stage of prostate cancer is proposed in this study. The problem of class imbalance, which is prominent in most medical data sets is also addressed here. Three feature subsets obtained by the use of principal components analysis (PCA), genetic algorithm (GA) and rough sets (RS) based approaches were also used in the study. The performance of under-sampling, synthetic minority over-sampling technique (SMOTE) and a combination of the two were also investigated and the performance of the obtained models was compared. To combine the classifier outputs, we used the Dempster-Shafer (DS) theory, whereas the actual choice of combined models was made using a GA. We found that the best performance for the overall system resulted from the use of under sampled data combined with rough sets based features modeled as a support vector machine (SVM)

Concomitant granular cell tumor and balanitis xerotica obliterans of the foreskin: A case report and literature review

AbstractBalanitis xerotica obliterans is a chronic dermatosis that frequently involves the glans penis and the foreskin. Granular cell tumor is a benign tumor that may rarely involve the penis, but involvement of the foreskin is exceedingly rare. It may result in thickening and ulceration of the overlying epidermis, which can mimic squamous cell carcinoma. An association of these two lesions, one very common and one extremely uncommon, arising concomitantly in the penile foreskin has not been previously documented. A 23-year-old patient with phimosis and a subcutaneous foreskin nodule presented for a medical circumcision. The microscopic examination demonstrated balanitis xerotica obliterans and granular cell tumor, occurring in continuity in the foreskin. To our knowledge, this is the first reported example of these two lesions arising simultaneously in the male genitalia

Hydrothermal synthesis of hematite (Fe2O3) nanoparticles, structure, morphology and magnetic properties

У овој докторској дисертацији описана је хидротермална синтеза наночестичног хематита (α-Fe2O3), као и карактеризација материјала, у сврху његове потенцијалне примене у различитим областима. Синтетисани узорци су карактерисани ренгеноструктурном анализом (XRDP), електронском микроскопијом (SEM и TEM), магнетометријом са вибрирајућим узорком (VSM) и вибрационом спектроскопијом (FTIR и Raman). Извршена је и математичка анализа морфологија честица, применом дескриптора облика на одабране ТЕМ слике узорака...This doctoral dissertation presented hydrothermal synthesis and characterization of hematite (α-Fe2O3) nanoparticles, towards potential applications in differrent fields. Synthesized sample were characterized with X-ray powder diffraction method (XRDP). electrone microscopy (SEM and TEM), vibrating sample magnetometry (VSM) and vibrational spectroscopy methods (FTIR and Raman). Mathematical analysis of nanoparticle morphology was also conducted, applying shape descriptors on segmented TEM sample images..

Фотодиелектрична карактеризација светлосног погона Au/TiO2 наномотори у течном медију

This article reports on photodielectric properties of hydrocolloids of TiO2 particles and Au/TiO2 hybrid particles of lateral dimension of ∼200 nm. Illumination of the colloids with visible light did not cause measurable changes in their electrical conductivity, while the application of UV (365 nm) light led to photoinduced increase in conductivity of up to 2%. The photogeneration of ions in water, regardless of the presence of the particles, makes a dominant contribution to the photoinduced increase in conductivity of the colloid

The calcification of collagen by HAP functionalized carbon materials

Bone is composed of two phases. The organic phase is made of collagen fibrils assembled in broad fibers acting as a template for mineralization. The mineral phase comprises hydroxyapatite (HAP) crystals grown between and inside the collagen fibers. We have developed a material using functionalized carbon nanotubes, carbon fibers and glasy carbon as scaffold to initiate in vitro mineralization. Mentioned carbon materials are functionalized with carboxylic groups prior to decorating. All samples were dispersed in ultra-pure water and incubated for 2 weeks in a synthetic body fluid with dispersed HAP, in order to induce the calcification of the functionalized carbon materials. Atomic force microscopy (AFM) and transmision electron microscopy (TEM) showed that Ca2+ and PO4 3- ions were deposited as round-shaped nodules. Raman spectroscopic studies confirmed the HAP formation, and image analysis made on TEM pictures showed that HAP were packed around and inside the carbon materials together. All three types of investigated carbon materials leading to successful calcification of collagen. This suggests that it takes the presence of carbon materials to prevent it from calcification of collagen, independent of the structures of the material

Anthocyanin-functionalized biopolymer films as pH-sensitive indicators

Anthocyanins are water-soluble, non-toxic flavonoid pigments, which produce the blue, red and purple color of many plants. Color change of anthocyanin extracts is a direct consequence of the transformation of their chemical structure when exposed to different pH conditions. Optical properties investigated in UV-Vis absorption and PL spectra show a clear difference between anthocyanins in acidic and in alkaline environments. Chitosan, a natural-based, non-toxic and biodegradable polysaccharide, is chosen as an ideal matrix for nanocomposites. It is proven to be a good carrier for anthocyanins, because of its ability to entrap the indicator dyes and at the same time the ability to release anthocyanins when in contact with an acidic environment. In this research, we have developed anthocyanin-enhanced biopolymer indicator systems, which provide fast colorimetric response to alterations in pH levels of the environment. Transmittance spectra of nanocomposites show excellent light-blocking properties of the films. This opens up possibilities for advancement in future technology of smart biodegradable food packaging biomaterials. The availability of innovative and healthy materials reduces the need for using synthetic plastic in the modern food industry.IX International School and Conference on Photonics : PHOTONICA2023 : book of abstracts; August 28 - September 1, 2023; Belgrad