197 results on '"Koruga, Đuro"'
Search Results
2. Clinical impact of nanophotonic blue-light filtering spectacles based on fullerene C60 and polymethyl methacrylate (PMMA)
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Jankov Mirko R., Jakšić Vesna, and Koruga Đuro
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spectacles ,filter ,colours ,field of view ,Medicine (General) ,R5-920 - Abstract
Background/Aim. Blue light might be harmful to the retina. The nano-material based on fullerene C60 and polymethyl methacrylate (PMMA) transforms the light into harmonized light and absorbs violet, blue, and ultraviolet (UV) wavelength. The aim of the study was to evaluate the subjective and objective impact of the spectacles on daily activities. Methods. Twenty-five healthy participants were sub-mitted to contrast sensitivity (CS) and visual field (VF) testing and a questionnaire about the influence of spectacles on daily activities: two spectacles with different concentrations of fullerene C60 vs. two commercially available blue-blocking spectacles. Results. There was no statistical difference in CS (p = 0.83), in VF parameters: mean deviation (MD) (p = 0.36), pattern standard deviation (PSD) (p = 0.25), number of relative scotomas (p = 0.31), while the number of absolute scotomas showed a statistically significant decrease (p < 0.05). Spectacles B (with a lower concentration of fullerene – 0.025%) had the best overall comfort mean score (p < 0.00001): four-fifths of participants performed better only during the day, while two-thirds performed better both during the day and night. Spectacles B were also superior in overall satisfaction regarding all combined daily activities (4.04 ± 1.1) (p = 0.0008). Conclusion. Blue-blocking filters with fullerene C60 increase the overall comfort of daily tasks during and after their use. These filters might be an effective mechanism that can protect us from ocular pathologies while providing better comfort in daily activities.
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- 2021
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3. Role of fullerenols derivative 3HFWC in the treatment of Alzheimer's disease
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Ivković, Sanja, Koruga, Đuro, Ivković, Sanja, and Koruga, Đuro
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- 2024
4. The Second Derivative of Fullerene C60 (SD-C60) and Biomolecular Machinery of Hydrogen Bonds: Water-Based Nanomedicine
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Matija, Lidija, Stanković, Ivana, Purić, Milica, Miličić, Milica, Maksimović-Ivanić, Danijela, Mijatović, Sanja, Krajnović, Tamara, Gordić, Vuk, Koruga, Đuro, Matija, Lidija, Stanković, Ivana, Purić, Milica, Miličić, Milica, Maksimović-Ivanić, Danijela, Mijatović, Sanja, Krajnović, Tamara, Gordić, Vuk, and Koruga, Đuro
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The human body contains 60–70% water, depending on age. As a body fluid, it is not only a medium in which physical and chemical processes take place, but it is also one of the active mediators. Water is the richest substance with non-covalent hydrogen bonds. Water molecules, by themselves (in vacuum), are diamagnetic but when organized into clusters, they become diamagnetic or paramagnetic. Also, biomolecules (DNA, collagen, clathrin, and other proteins) have non-covalent hydrogen bonds in their structure. The interaction, as well as signal transmission, between water and biomolecules is achieved through the vibrations of covalent and non-covalent hydrogen bonds, which determine the state and dynamics of conformational changes in biomolecules. Disruptive conformational changes in biomolecules, cells, and tissues lead to their dysfunctionality, so they are a frequent cause of many disorders and diseases. For example, the rearrangement of hydrogen bonding due to mitochondrial disease mutation in cytochrome bc1 disturbs heme bH redox potential and spin state. In order to prevent and repair the dysfunctional conformational changes, a liquid substance was developed based on the second derivative of the C60 molecule (SD-C60), which has classical and quantum properties. The characterization of SD-C60 by UV-VIS-NIR, FTIR, TEM, and AFM/MFM was performed and it is shown that SD-C60 water layers generate vibrations with near-zero phase dispersion which are transmitted through Fibonacci’s water chains to biomolecules. In comparison with previously published SD-C60 derivate (3HFWC, size until 10 nm, and 1–5 water layers), the improved formulation (3HFWC-W, size 10–25 nm, and 6–9 water layers) showed multiplied cytotoxic activity against melanoma cell lines of different aggressiveness. Apart from this, the mode of action was preserved and based on an induction of senescence rather than cell death. Importantly, high selectivity towards malignant phenotypes was detected. Observed e
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- 2023
5. Opto-magnetic imaging spectroscopy in characterization of the tissues during hyperbaric oxygen therapy
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Sedlar Mariana, Nikolić Gorana V., Dragičević Aleksandra, and Koruga Đuro
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hyperbaric oxygenation ,tissues ,spectrum analysis: biomedical engineering ,methods ,optical imaging ,Medicine (General) ,R5-920 - Abstract
Background/Aim. Opto-magnetic imaging spectroscopy (OMIS) was used as a novel method to determine tissue molecular conformation changes during hyperbaric oxygen (HBO) therapy. The aim of this study was to examine the usefulness of OMIS for the assessment of HBO therapy effectiveness on the diseased tissue. Method. OMIS is concerned with obtaining paramagnetic/diamagnetic properties of materials, related to the presence of unpaired/paired electrons based on their interaction with visible light. The basic tool is light of wavelength in the range between 400 nm and 700 nm and its interaction with tissue. The study included 22 subjects: 16 angiopathy patients and 6 healthy subjects as the control group. OMIS was used with patients on the 1st, 10th and 20th session and with the control group on the 1st, 10th and 20th day without HBO therapy in between. Results. The obtained results showed that healthy skin of all the control group subjects had the same shape curve. In the angiopathy patient group, before the first session OMIS showed tissue disorder and after the last session results resembled more closely the results in healthy tissue. The differences in the tissue state in the angiopathy group before each session were noticeable, showing normalized tissue under the influence of HBO. Conclusion. The results showed that OMIS could be used as a diagnostic tool for detection of the tissue state before and after the HBO therapy. [Projekat Ministarstva nauke Republike Srbije, br. III41006]
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- 2015
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6. Physiological Response, Oxidative Stress Assessment and Aquaporin Genes Expression of Cherry Tomato (Solanum lycopersicum L.) Exposed to Hyper-Harmonized Fullerene Water Complex
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Subotić, Angelina, primary, Jevremović, Slađana, additional, Milošević, Snežana, additional, Trifunović-Momčilov, Milana, additional, Đurić, Marija, additional, and Koruga, Đuro, additional
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- 2022
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7. DEEP LEARNING ALGORITHM FOR CERVICAL CANCER DETECTION BASED ON IMAGES OF OPTOMAGNETIC SPECTRA
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Jeftić, Branislava, primary, Hut, Igor, primary, Stanković, Ivana, primary, Šakota Rosić, Jovana, primary, Matija, Lidija, primary, and Koruga, Đuro, primary
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- 2022
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8. Investigation of influence of nanophotonic gas permeable contact lenses on saline by aquaphotomics and OMI spectroscopy
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Tomić Marija M., Conte Manuel, Munćan Jelena S., Stamenković Dragomir M., and Koruga Đuro Lj.
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contact lenses ,nir spectroscopy ,fullerene ,nanophotonic ,omi spectroscopy ,biocompatibility ,aquaphotomics ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Mechanics of engineering. Applied mechanics ,TA349-359 - Abstract
Contact lenses represent biomaterials whose main purpose is to correct the specific refractive anomaly of the eye. Since the visible light on its way to the perceptive part of the eye has to pass through the contact lens, the characteristics of the materials can significantly modify it. Biocompatibility of the lens surface is one of the most important issues in achieving contact lens wear without problems. We have developed new nanophotonic contact lens materials by adding nanoparticles of fullerene and their derivatives into standard PMMA RGP material. The aim of our investigation was to compare the influences of these materials on saline which is similar to tear film. We used NIR spectroscopy based on 12 vibration modes, called Aquaphotomics and Opto-magnetic imaging (OMI) spectroscopy as methods for characterizing the samples. The acquired spectrums were commented and compared with the standard contact lens material, which was analyzed by the same method.
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- 2014
9. Characterization of fullerenes thin film on glasses by UV/VIS/NIR and opto-magnetic imaging spectroscopy
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Šakota-Rosić Jovana, Conte Manuel, Munćan Jelena, Matija Lidija, and Koruga Đuro
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glasses ,fullerene ,thin film ,uv/vis/nir ,opto-magnetic imaging spectroscopy ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Mechanics of engineering. Applied mechanics ,TA349-359 - Abstract
UV/VIS spectroscopic characterization of glasses is a part of the standard procedure. The reasons to do it is to ensure UV eye protection and characterization of material transparency. However, we extend this research to IR domain because the quality of glasses depend not only on UV protection and their transparency but on complementarities and compatibility of eye vision with optical device, also. We characterized basic material of glasses by UV/VIS/NIR and novel method Opto-magnetic Imaging Spectroscopy (OMIS). Then we doped basic material with fullerenes, and characterized them using the same procedure. Results are presented and discussed.
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- 2014
10. Characterization of materials for commercial and new nanophotonic soft contact lenses by optomagnetic spectroscopy
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Debeljković Aleksandra, Veljić Vladimir, Sijački-Žeravčić Vera, Matija Lidija, and Koruga Đuro
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basic and nanophotonic materials for soft contact lenses ,fullerenes ,optomagnetic spectroscopy ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Mechanics of engineering. Applied mechanics ,TA349-359 - Abstract
The contact lens industry and market have displayed a high level of dynamism in the past few decades, and have evolved into a rapidly changing field in which science and everyday practice constantly interact. This work presents the comparative research of characteristics of the basic (commercial) material and nanophotonic materials which were obtained by incorporation of fullerene nanoparticles and its derivate in basic material for soft contact lenses. Basic contact lens material was sintetized of monomer 2-hydroxyethyl methacrylate (HEMA), and fullerene and its derivates were used due to their good transmission characteristics in ultraviolet, visible and near infra-red spectrum. For the purposes of characterization of materials for soft contact lenses Optomagnetic Spectroscopy (OMS) was used. OMS is based on difference between diffusely reflected white light and reflected polarized white light. This research contributes to applied optical science and biomedical application industry.
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- 2014
11. Discrimination of mineral waters using near infrared spectroscopy and aquaphotomics
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Munćan Jelena S., Matija Lidija, Simić-Krstić Jovana B., Nijemčević Srećko S., and Koruga Đuro Lj.
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water ,discrimination ,near infrared spectroscopy ,aquaphotomics ,multivariate analysis ,Chemical technology ,TP1-1185 - Abstract
Despite that water is one of the most studied materials today its dynamic properties are still not well understood. Water state in human organism is of high importance for normal healthy functioning of human body. Different kinds of water are usually classified according to its present solutes, and concentrations of these solutes, but though it is known that water molecules can form clusters around present solutes, classification of waters based on types of water molecular organization and present clusters is not present in current literature. In this study we used multivariate analysis for classification of commercial mineral waters based on their near infrared spectra (NIR). Further, we applied Aquaphotomics, a new approach for interpretation of near infrared spectra of water, which gives insight into organization of water molecules in each of these waters.
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- 2014
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12. Modeling of bioimpedance for human skin based on fractional distributed-order modified cole model
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Lazović Goran, Vosika Zoran, Lazarević Mihailo, Simić-Krstić Jovana, and Koruga Đuro
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human skin ,fractional calculus ,cole model ,frequency analysis ,electric impedance ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Mechanics of engineering. Applied mechanics ,TA349-359 - Abstract
Electrical impedance measurement data and fractional calculus have been utilized for modeling bioimpedance properties of human skin. We introduced and proposed revisited Cole model using modified distributed order operator based on the Caputo-Weyl fractional derivatives. Our proposed model presents essentially modified single-dispersion Cole model, since it introduces a new parameters k and σ in single-dispersion Cole impedance equation. These parameters characterize the width of interval around fractional index α and they are important for more accurate describing bioimpedance properties of human skin. The impedance spectrum was measured in a finite frequency range up to 100 kHz. Our proposed modified Cole model fits much better to experimental curve in a given frequency range compared to existing Cole models. The fitting is done using the Levenberg-Marquardt nonlinear least squares.
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- 2014
13. Characterization of nanophotonic soft contact lenses based on poly (2-hydroxyethyl methacrylate) and fullerene
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Debeljković Aleksandra D., Matija Lidija R., and Koruga Đuro Lj.
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nanophotonic soft contact lenses ,PHEMA ,fullerenes ,optical power ,Chemical technology ,TP1-1185 - Abstract
This work presents comparative research of characteristics of a basic and new nanophotonic material, the latter of which was obtained by incorporation fullerene, C60, in the base material for soft contact lenses. The basic (SL38) and nanophotonic materials (SL38-A) for soft contact lenses were obtained by radical polymerization of 2-hydroxyethyl methacrylate and 2-hydroxyethyl methacrylate and fullerene, which were derived by the technology in the production lab of the company Soleko (Milan, Italy). The materials were used for production of soft contact lenses in the company Optix (Belgrade, Serbia) for the purposes of this research. Fullerene was used due to its apsorption transmission characteristics in ultraviolet, visible and near infrared spectrum. For the purposes of material characterization for potential application as soft contact lenses, network parameters were calculated and SEM analysis of the materials was performed while the optical properties of the soft contact lenses were measured by a Rotlex device. The values of the diffusion exponent, n, close to 0.5 indicated Fick's kinetics corresponding to diffusion. The investigated hydrogels could be classified as nonporous hydrogels. With Rotlex device, values of optical power and map of defects were showed. The obtained values of optical power and map of defects showed that the optical power of synthesized nanophotonic soft contact lens is identical to the nominal value while this was not the case for the basic lens. Also, the quality of the nanophotonic soft contact lens is better than the basic soft contact lens. Hence, it is possible to synthesize new nanophotonic soft contact lenses of desired optical characteristics, implying possibilities for their application in this field.
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- 2013
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14. Dental calculus: Nano-characterization
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Koruga Đuro, Grga Đurica, Marjanović Marina, Hut Igor, and Dželetović Bojan
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dental calculus ,nano-characterization ,atomic force microscopy (AFM) ,magnetic force microscopy (MFM) ,opto-magnetic spectroscopy (OMS) ,Dentistry ,RK1-715 - Abstract
Emerging technologies and new nanoscale information have potential to transform dental practice by improving all aspects of diagnostics and therapy. Nanocharacterization allows understanding of oral diseases at molecular and cellular levels which eventually can increase the success of prevention and treatment. Opto-magnetic spectroscopy (OMS) is a promising new technique based on light-matter interaction which allows insight into the quantum state of matter. Since biomolecules and tissues are usually paramagnetic or diamagnetic materials it is possible to determine the dynamics of para-and diamagnetism at different teeth structures using that method. The topography of the surface of a sample can be obtained with a very high resolution using atomic force microscopy (AFM), which allows observation of minimal changes up to 10 nm, while magnetic force microscopy (MFM) is used to record the magnetic field gradient and its distribution over the surface of a sample. The aim of this study was to determine the possibility of AFM and MFM for the characterization of dental calculus, and a potential application of OMS for the detection of subgingival dental calculus.
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- 2012
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15. Deep learning algorithm for cervical cancer detection based on images of optomagnetic spectra
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Jeftić, Branislava, Hut, Igor, Stanković, Ivana, Šakota Rosić, Jovana, Matija, Lidija, Koruga, Đuro, Jeftić, Branislava, Hut, Igor, Stanković, Ivana, Šakota Rosić, Jovana, Matija, Lidija, and Koruga, Đuro
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In order to further investigate performance of Optomagnetic Imaging Spectroscopy in cervical cancer detection, deep learning algorithm has been used for classification of optomagnetic spectra of the samples. Optomagnetic spectra reflect cell properties and based on those properties it is possible to differ-entiate normal cells from cells showing different levels of dysplasia and cancer cells. In one of the previous research, Optomagnetic imaging spectroscopy has demonstrated high percentages of accuracy, sensitivity and specificity in cervical cancer detection, particularly in the case of binary classification. Somewhat lower accuracy percentages were obtained in the case of four class classification. Compared to the results obtained by conventional machine learning classification algorithms, proposed deep learning algorithm achieves similar accuracy results (80%), greater sensitivity (83.3%), and comparable specificity percentages (78%).
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- 2022
16. A gold nanoparticles and hydroxylated fullerene water complex as a new product for cosmetics
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Rudolf, Rebeka, Jelen, Z., Zadravec, M., Majerić, P., Jović, Zorana, Vuksanović, M., Stanković, Ivana, Matija, Lidija, Dragičević, Aleksandra, Thompson, Miso N., Horvat, A., Koruga, Đuro, Rudolf, Rebeka, Jelen, Z., Zadravec, M., Majerić, P., Jović, Zorana, Vuksanović, M., Stanković, Ivana, Matija, Lidija, Dragičević, Aleksandra, Thompson, Miso N., Horvat, A., and Koruga, Đuro
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Three types of gold nanoparticles (AuNPs) were synthesised with a custom-made Ultrasonic Spray Pyrolysis (USP) device, from aqueous solutions of gold (III) chloride (AuCl3) and gold (III) acetate (AuC6H12O6), with an initial concentration of Au 0.5 g/L. AuNPs were collected in suspensions of deionised (D.I.) water with the stabilisers polyvinylpyrrolidone (PVP) or polyethylene glycol (PEG), followed by the process of freeze drying the AuNPs to be useful as a new additive for the cream. The standard cream base was used as a matrix for preparation of three types of cream with AuNPs in the same concentration ratios. The third AuNPs cream was prepared with a patented hydroxylated fullerene water complex (3HFWC-W) matrix. To examine the effect of AuNPs as additive in creams, a six-week study of test creams was conducted on 33 volunteers with no dermatological diseases. During the study three main parameters of the skin where measured: Collagen quality, skin moisturisation and the epidermis-dermis function. The results of the study found improvements of collagen quality between 18-24 %, achieved due to the use of AuNPs in standard creams, while the cream with the combination of 3HFWC-W and AuNPs gave significantly higher improvements with a value of 45.7 %. It was also discovered that hydration of the skin (stratum cornum) increased by 6.4-9.6 % in standard creams with AuNPs, and 73.7 % in the 3HFWC/AuNPs' cream. Similar results were measured by the epidermisdermis function, where 24-28 % improvement for standard creams with AuNPs was identified, and 38.4 % for the cream 3HFWC-W/AuNPs.
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- 2022
17. Deformations of the manual endodontic instruments during root canal instrumentation
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Nešković Jelica, Damjanov Marija, Živković Slavoljub, Grga Đurica, Koruga Đuro, and Kojić Dušan
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manual endodontic instruments ,deformation ,sterilization ,Dentistry ,RK1-715 - Abstract
Introduction. Mechanical instrumentation of the complex root canal system is very demanding procedure which requires use of the various manual and rotary instruments. The aim of this study was to assess the frequency and to verify the possible deformation of the working part of endodontic instruments after their multiple clinical use. Material and Methods. New sets of the manual endodontic instruments (reamers, K-files and Hedstroem) used in routine clinical use (44 instruments) and for root canal instrumentation of extracted teeth (44 instruments) were included in the study. Instrumentation was performed by Step-Back technique and constant irrigation with 0.5% NaOCl solution, 10 ml for each root canal. All the instruments were used 10 times and after use sterilized in a dry sterilizer or autoclave. The working parts of deformed instruments were analyzed using optimagnetic print. Results. The results obtained after clinical use showed deformations of the working part of the reamers in 50%, K-files in 43% and Hedstroem in 66.7% of used instruments. After instrumentation the canal of the extracted teeth, deformations were observed in 87.5% of the reamers, in 50% of the K-files and in 62.5% of Hedstroem files. The difference in frequency of the deformations was not statistically significant. On the instruments used for the preparation the canals of the extracted teeth and sterilized in autoclave, malformations were observed in 86.4%, comparing to the instruments sterilized in a dry sterilizer where malformations of the working part were registered in 59.1% of the cases. That difference was statistically significant (χ2=5.250; p=0.072). Conclusion. Multiple use of the manual endodontic instruments in clinical conditions leads to increased frequency of malformations of the working part in all types of manual endodontic instruments.
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- 2010
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18. Fractal analysis for biosurface comparison and behaviour prediction
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Bojović Božica A., Miljković Zoran Đ., Babić Bojan R., and Koruga Đuro Lj.
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fractals ,topography ,surface ,AFM ,image ,Chemical technology ,TP1-1185 - Abstract
Fractal analysis was used in previous authors' researches for characterizations of grinded ceramics surface textures by surface profile fractal dimension. In this paper the 'skyscrapers' method was chosen for calculating fractal dimension of surface, using the image processing toolbox, as well as a custom-developed algorithm of Matlab environment. This method entails recording the surface as an image, by using a scanning probe microscope. In the given contact lens case, fractal dimension values confirm changes of the surface roughness during the cleaning and wearing processes. Examination of real surface roughness could provide comparison and functional behavior prediction.
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- 2009
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19. Fullerene-Filtered Light Spectrum and Fullerenes Modulate Emotional and Pain Processing in Mice
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Lazović, Jelena, Zopf, Lydia M., Hren, Jernej, Gajdos, Martin, Slavković, Marija, Jović, Zorana, Stanković, Ivana, Matović, Valentina, Koruga, Đuro, Lazović, Jelena, Zopf, Lydia M., Hren, Jernej, Gajdos, Martin, Slavković, Marija, Jović, Zorana, Stanković, Ivana, Matović, Valentina, and Koruga, Đuro
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The most symmetric molecule, Buckminster fullerene C-60, due to its unique properties, has been intensively studied for various medical and technological advances. Minimally invasive and minimally toxic treatments hold great promise for future applications. With this in mind, this research exploited the physical properties of fullerene molecules for potential therapeutic effects. Pristine fullerenes have peak absorbance in the 380-500 nm range, making them an attractive violet-blue light filter. Since spectral quality of light can affect behavior, this research used resting state functional magnetic resonance imaging (rs fMRI) and behavioral testing to directly evaluate the effects of fullerene-filtered light on brain processing and behavior in mice. The same method was used to study if hydroxyl fullerene water complexes (3HFWC), with or without fullerene-filtered light, modulated brain processing. A month-long, daily exposure to fullerene-filtered light led to decreased activation of the brain area involved in emotional processing (amygdala). Water supplemented with 3HFWC resulted in an activation of brain areas involved in pain modulation and processing (periaqueductal gray), and decreased latency to first reaction when tested with a hot plate. The combination of fullerene-filtered light with 3HFWC in drinking water led to restored sensitivity to a hot plate and activation of brain areas involved in cognitive functions (prelimbic, anterior cingulate and retrosplenial cortex). These results uncovered the potential of fullerene-filtered light to impact emotional processing and modulate pain perception, indicating its further use in stress and pain management.
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- 2021
20. Mechanisms of skin moisturization with hyperharmonized hydroxyl modified fullerene substance
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Miljković, Suzana, Jeftić, Branislava, Stanković, Ivana, Stojiljković, Nikola, Koruga, Đuro, Miljković, Suzana, Jeftić, Branislava, Stanković, Ivana, Stojiljković, Nikola, and Koruga, Đuro
- Abstract
Background Hyper Harmonized Hydroxyl Modified Fullerene Substance (3HFWC(+)) establishes hydrogen bonds with the surrounding water molecules and organizes them in clusters with the liquid crystalline state, similar to the properties of water surrounding the biomolecules. Aims To investigate the moisturizing properties of hyperharmonized fullerenol-3HFWC(+) as an emulsion O/W ingredient on the skin. Patients/Methods We have analyzed the reflexion of the blue light from the skin, in vivo, with different levels of moisturization and compared the influence of three groups of cosmetic products (with various active ingredients, 3HFWC(+) or water in same percentage in the "vehiculum") on skin moisturization by measuring paramagnetic/diamagnetic properties by Optomagnetic Imaging Spectroscopy. Results Regenerating Cream and Body Lotion have shown statistically significant increase of diamagnetic features predominantly in all 3 types of creams, while the Hand Cream formulations have not shown statistically significant results after 4 weeks of treatment. Anti-aging cream with 3HFWC(+) demonstrated statistically significant increase of paramagnetic properties of the skin (p(+)/p(-) from 0.90 to 0.62) and showed beneficial effects on information transfer and water content in stratum corneum. Conclusion Although it does not act as a classical moisturizing agent on the skin, 3HFWC(+) can increase moisturization as a result of hydrogen bonds established among 3HFWC(+) and water or biomolecules, liquid crystalline state of water in 3HFWC(+) resembling the properties of water surrounding the biomolecules, and finally, liquid crystalline state of water in the products.
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- 2021
21. Klinički efekat nanofotonskih naočara s plavim filterom na bazi fulerena C60 i polimetil metakrilata (PMMA)
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Jankov, Mirko R., Jakšić, Vesna, Koruga, Đuro, Jankov, Mirko R., Jakšić, Vesna, and Koruga, Đuro
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Uvod/Cilj. Plavo svetlo može da bude štetno za retinu. Nano-materijal od fulerena C60 i polimetil metakrilata (PMMA) transformiše svetlo u harmonizovano hiperpolarizovano svetlo upijajući plavu, ljubičastu i ultraljubičastu talasnu dužinu. Cilj ovog rada bio je da se oceni subjektivni i objektivni uticaj nošenja naočara na obavljanje dnevnih aktivnosti. Metode. Dvadeset pet zdravih dobrovoljaca podvrgnuto je kompletnom oftalmološkom pregledu, ispitivanju kontrastne senzitivnosti (KS) i perimetrije (PM). Popunjavan je upitnik o uticaju naočara na dnevne aktivnosti: dvoje naočara sa različitim koncentracijama fulerena C60 upoređeno je sa dvoje komercijalno dostupnih naočara sa plavim filterom. Rezultati. Nije postojala statistička razlika u KS (p = 0,83), kod PM parametara: MD (mean deviation) (p = 0,36), PSD (pattern standard deviation) (p = 0,25), i kod broja relativnih skotoma (p = 0,31), dok je broj apsolutnih skotoma pokazao statistički značajno smanjenje (p lt 0,05). Naočare B (sa manjom koncentracijom fulerena od 0,025%) imale su sveukupno najbolju srednju ocenu (p lt 0,00001): oko četiri petine ispitanika je bolje funkcionisalo danju, dok je oko dve trećine njih osećalo boljitak i danju i noću. Naočare B su isto tako bile superiorne u sveukupnoj oceni zadovoljstva pri svim kombinovanim dnevnim aktivnostima (4,04 ± 1,1) (p = 0,0008). Zaključak. Naočare sa plavim filterom na bazi fulerena C60 povećavaju sveukupan komfor u obavljanju dnevnih aktivnosti pri njihovom nošenju i nakon nošenja. Ovi filteri mogu da budu efikasan način zaštite od očnih bolesti uzrokovanih plavim svetlom uz povećan komfor u obavljanju svakodnevnih aktivnosti., Background/Aim. Blue light might be harmful to the retina. The nano-material based on fullerene C60 and polymethyl methacrylate (PMMA) transforms the light into harmonized light and absorbs violet, blue, and ultraviolet (UV) wavelength. The aim of the study was to evaluate the subjective and objective impact of the spectacles on daily activities. Methods. Twenty-five healthy participants were submitted to contrast sensitivity (CS) and visual field (VF) testing and a questionnaire about the influence of spectacles on daily activities: two spectacles with different concentrations of fullerene C60 vs. two commercially available blue-blocking spectacles. Results. There was no statistical difference in CS (p = 0.83), in VF parameters: mean deviation (MD) (p = 0.36), pattern standard deviation (PSD) (p = 0.25), number of relative scotomas (p = 0.31), while the number of absolute scotomas showed a statistically significant decrease (p lt 0.05). Spectacles B (with a lower concentration of fullerene - 0.025%) had the best overall comfort mean score (p lt 0.00001): four-fifths of participants performed better only during the day, while two-thirds performed better both during the day and night. Spectacles B were also superior in overall satisfaction regarding all combined daily activities (4.04 ± 1.1) (p = 0.0008). Conclusion. Blue-blocking filters with fullerene C60 increase the overall comfort of daily tasks during and after their use. These filters might be an effective mechanism that can protect us from ocular pathologies while providing better comfort in daily activities.
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- 2021
22. Anti-melanoma effects of Hyper-harmonized hydroxylated fullerene water complex and hyperpolarized light in vivo
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Draca, Dijana, Markelić, Milica, Mojić, Marija, Jelaca, Sanja, Mijatović, Sanja, Jović, Zorana, Dragičević, Aleksandra, Koruga, Đuro, Maksimović-Ivanić, Danijela, Draca, Dijana, Markelić, Milica, Mojić, Marija, Jelaca, Sanja, Mijatović, Sanja, Jović, Zorana, Dragičević, Aleksandra, Koruga, Đuro, and Maksimović-Ivanić, Danijela
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- 2021
23. Influence of hyper-harmonized fullerene water complex on collagen quality and skin function
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Miljković, Suzana, Jeftić, Branislava, Šarac, Dušan, Matović, Valentina, Slavković, Marija, Koruga, Đuro, Miljković, Suzana, Jeftić, Branislava, Šarac, Dušan, Matović, Valentina, Slavković, Marija, and Koruga, Đuro
- Abstract
Background Fullerene water complex establishes the optimal order and function of biomolecules in natural, biophysical way by transducing the signal through water hydrogen bonds to biomolecules. Objectives This paper considers the effects of the patented hyper-harmonized-hydroxylated fullerene water complex (3HFWC) on biophysical properties of the skin collagen molecules. Method Optomagnetic imaging spectroscopy (OMIS) has been used for the analysis of the biophysical skin properties (diamagnetic/paramagnetic) after applying three groups of different cosmetic products. Tested cosmetic products were prepared by replacing the active ingredients with 3HFWC or with water in four commercial products. The original commercial creams and their vehiculums with water added served as control groups. Data were statistically analyzed using paired t test in R software. Results t Test gave statistically significant results for all of the products with 3HFWC, while within the control group, only body lotion and hand cream did show statistically significant results (P lt 0.05). Significant improvements in abundance and quality of collagen in the dermis were achieved with body lotion with 3HFWC (p(+)/p(-)ranged from 0.82 to 0.97). While body lotion vehiculum made collagen-water interaction more stable (p(+)/p(-)ranged from 0.3 to 0.55), hand cream with 3HFWC made it more dynamic (p(+)/p(-)ranged from 0.63 to 0.49). Body lotion vehiculum improved the compactness of the dermis (p(+)/p(-)ranged from 0.2 to 1.03), as well as commercial hand cream (p(+)/p(-) ranged from 0.28 to 0.85). Conclusion Compared to the control groups, cosmetic products with 3HFWC demonstrated positive effects on the biophysical properties of the skin. Increased paramagnetic properties are linked to more unpaired electrons, their faster movement, and, finally, better signal transduction. Thus, products with 3HFWC could enable faster regeneration of collagen and prompt skin reaction to the negative environmental inf
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- 2020
24. Optical and structural properties of PMMA/C(60)composites with different concentrations of C(60)molecules and its possible applications
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Stanković, Ivana, Matija, Lidija, Jankov, M., Jeftić, Branislava, Koruga, I., Koruga, Đuro, Stanković, Ivana, Matija, Lidija, Jankov, M., Jeftić, Branislava, Koruga, I., and Koruga, Đuro
- Abstract
Poly(methyl methacrylate)-Fullerene (PMMA/C-60) nanocomposites, with different concentrations of C(60)molecules (0.025 wt.%, 0.05 wt.%, 0.075 wt.% and 0.1 wt.%), were synthesized and characterized by Magnetic Force Microscopy and UV-VIS spectroscopy. Characterization had two main objectives: to identify C(60)molecules in the PMMA/C(60)complex and to evaluate the order of PMMA and C(60)molecules in it. Since the structural properties of PMMA/C(60)complex depend on the arrangement of methyl methacrylate (MMA) and C(60)molecules, it can be concluded that the structure of the complex directly correlates to the ratio of an unpaired/paired electrons within the material. To investigate the influence of different concentrations of fullerene molecules in PMMA on the attraction and the repulsion forces in material, based on paired and unpaired electrons, and ultimately on the complex structural and optical properties, Magnetic Force Microscopy was used. Investigation showed that PMMA/C(60)complex with 0.025 wt.% concentration of C(60)has the best structural and optical properties for applications in ophthalmology, and may be used as a new material for spectacles. UV-VIS Spectroscopic analysis in domain of 380 to780 nm showed that PMMA material with 0.025 wt.% concentration of C(60)reduces UV and high blue energy light for more than 60% and in new spectral scenario ratio of blue and green spectra is changed.
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- 2020
25. NEW APPROACH TO DETECTION OF ABNORMAL CERVICAL CELLS
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Jeftić, Branislava, primary, Matija, Lidija, primary, and Koruga, Đuro, primary
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- 2019
- Full Text
- View/download PDF
26. Chapter Recent Advances in IR and UV/VIS Spectroscopic Characterization of the C76 and C84 Isomers of D2 Symmetry
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Jovanović, Tamara, Koruga, Đuro, Jovančićević, Branimir, Jovanović, Tamara, Koruga, Đuro, and Jovančićević, Branimir
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The stable isomers of the higher fullerenes C76 and C84 with D2 symmetry as well as the basic fullerenes C60 and C70 were isolated from carbon soot and characterized by the new and advanced methods, techniques, and processes. The validity of several semiempirical, ab initio, and DFT theoretical calculations in predicting the general pattern of IR absorption and the vibrational frequencies, as well as the molecular electronic structure of the C76 and C84 isomers of D2 symmetry, is confirmed, based on recent experimental results. An excellent correlation was found between the previously reported theoretical data and the recently obtained experimental results for these molecules over the relevant spectral range for the identification of fullerenes. These results indicate that there are no errors in the calculations in the significant spectral regions, the assumptions that were based on previous comparisons with partial experimental results Isolated fullerenes are important for their applications in electronic and optical devices, solar cells, optical limiting, sensors, polymers, nanophotonic materials, diagnostic and therapeutic agents, health and environment protection, and so forth.
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- 2019
27. Mechanical properties of surfaces studied by atomic force microscope
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Matija, Lidija, Kojić, Dušan, Petrov, Ljubiša, Koruga, Đuro, Matija, Lidija, Kojić, Dušan, Petrov, Ljubiša, and Koruga, Đuro
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- 2019
28. Mechanical properties of human skin studied by atomic force microscope
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Kojić, Dušan, Matija, Lidija, Petrov, Ljubiša, Koruga, Đuro, Kojić, Dušan, Matija, Lidija, Petrov, Ljubiša, and Koruga, Đuro
- Published
- 2019
29. Novi pristup otkrivanja abnormalnih ćelija grlića materice
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Jeftić, Branislava, Matija, Lidija, Koruga, Đuro, Jeftić, Branislava, Matija, Lidija, and Koruga, Đuro
- Abstract
Optomagnetna imidžing spektroskopija pokazala je visok procenat tačnosti u klasifikaciji bioloških tkiva, posebno kada se radi o uzorcima grlića materice, usne duplje i debelog creva. Ova metoda omogućava detekciju abnormalnog tkiva i ćelija i stoga može da se koristi kao dijagnostički test u okviru skrining programa. U prethodnim studijama analizirani su cervikalni uzorci i uzorci dobijeni tehnikom citologije na tečnoj bazi pomoću optomagnetne imidžing spektroskopije u cilju detekcije karcinoma grlića materice i pokazano je da ova metoda može da razdvoji zdravo tkivo od kancera. Do sada su testirani samo binarni klasifikacioni modeli za kasifikaciju cervikalnih uzoraka na bazi optomagnetnih spektara uzoraka. U ovom radu testirana je klasifikacija Papanikolaou razmaza u četiri klase (II, III, IV i V Papanikolaou grupe) korišćenjem klasifikacionog modela na bazi Random Forest klasifikatora koji je pokazao interklasnu senzitivnost od 49,25%, 58,97%, 50%, 44,44% za II, III, IV i V Papanikolau grupu respektivno, i specifičnost od 65,26%, 54,76%, 98,70% i 98,69% za II, III, IV i V Papanikolau grupu respektivno., Optomagnetic Imaging Spectroscopy demonstrated high percentages of accuracy in biological sample classification, namely cervical, oral and colon samples. It enables detection of abnormal tissue and cells, and thus can be used as a diagnostic tool in screening programs. Papanicolaou smears and liquid based cytology samples were analysed in previous studies on cervical cancer detection by Optomagnetic Imaging Spectroscopy and it was shown that this method can diferentiate normal healthy tissue from the cancer tissue. So far, only binary classification of the cervical samples was performed based on optomagnetic spectra of the samples. In this paper, classification of the Papanicolaou smears into four groups (II, III, IV and V Papanicolaou groups) was tested with the Random Forest classification model that demonstrated interclass sensitivity of 49.25%, 58.97%, 50%, 44.44% for II, III, IV and V Papanicolaou group respectively, and specificity of 65.26%, 54.76%, 98.70% and 98.69% for II, III, IV and V Papanicolaou group respectively.
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- 2019
30. Classification of Healthy and Cancer States of Colon Epithelial Tissues Using Opto-magnetic Imaging Spectroscopy
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Dragičević, Aleksandra, Matija, Lidija, Krivokapić, Zoran, Dimitrijević, Ivan, Baros, Marko, Koruga, Đuro, Dragičević, Aleksandra, Matija, Lidija, Krivokapić, Zoran, Dimitrijević, Ivan, Baros, Marko, and Koruga, Đuro
- Abstract
Colorectal carcinoma (CRC) as a major health problem in industrialized countries is highly preventable and can be successfully treated in the early stages. However, incidence and mortality of CRC has increased over the last two decades. The reason could be that the current recommended options for screening are costly, unpleasant for patients, have low sensitivity and poor accessibility for screening. These reasons provide a strong rationale for the development of a new method. Opto-magnetic imaging spectroscopy (OMIS) as a new imaging method for the characterisation of various materials, including human tissues, is based on light-matter interaction, using a Poincare sphere for light properties and a Bloch sphere for electron properties, and allows the detection of biophysical characteristics within human tissue samples. Compared with histopathology examination, the OMIS method achieved an accuracy of 92.59% using Multilayer Perceptron Neural Network as a classifier, and 89.87% using Naive-Bayes, respectively. The obtained results, based on the investigation of 316 samples, both tumour and normal mucosa (162 cancer cases), strongly suggest that the new non-invasive OMIS method might be used for tissue characterization ex vivo to discriminate between the healthy and carcinoma state of the colon. However, it opens up the possibility of using the same method in in vivo studies to assist physicians in targeting biopsies of colorectal tissue.
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- 2019
31. Machine Learning Classification of Cervical Tissue Liquid Based Cytology Smear Images by Optomagnetic Imaging Spectroscopy
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Hut, Igor, Jeftić, Branislava, Matija, Lidija, Ćojbašić, Žarko, Koruga, Đuro, Hut, Igor, Jeftić, Branislava, Matija, Lidija, Ćojbašić, Žarko, and Koruga, Đuro
- Abstract
Semi-automated system for classification of cervical smear images based on Optomagnetic Imaging Spectroscopy (OMIS) and machine learning is proposed. Optomagnetic Imaging Spectroscopy has been applied to screen 700 cervical samples prepared according to Liquid Based Cytology (LBC) principles and to record spectra of the samples. Peak intensities and peak shift frequencies from the spectra have been used as features in classification models. Several machine learning algorithms have been tested and results of classification have been compared. Results suggest that the presented approach can be used to improve standard LBC screening tests for cervical cancer detection. Developed system enables detection of pre-cancerous and cancerous states with sensitivity of 79% and specificity of 83% along with AUC (ROC) of 88% and could be used as an improved alternative procedure for cervical cancer screening. Moreover, this can be achieved via portable apparatus and with immediately available results.
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- 2019
32. Predictive Value of Opto-magnetic Imaging Spectroscopy in Discriminating Oral Squamous Cell Carcinoma from Non-tumor Tissue in Surgical Margins
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Lisul, Bogdan, Lisul, Bogdan, Jelovac, Drago, Petrović, Milan, Tepavčević, Zvezdana, Koruga, Đuro, Grga, Đurica, Lisul, Bogdan, Lisul, Bogdan, Jelovac, Drago, Petrović, Milan, Tepavčević, Zvezdana, Koruga, Đuro, and Grga, Đurica
- Abstract
PurposeNegative surgical margins status is of extreme importance for better prognosis and lower recurrence rate in patients undergoing surgical treatment for oral squamous cell carcinoma (OSCC). Standard histopathology is time consuming and current optical procedures come with various limitations. We examined the potential of a new imaging technique-opto-magnetic imaging spectroscopy (OMIS) in discriminating tumor (OSCC) from adjacent non-tumor oral cavity tissue.MethodsA total of 46 samples from 21 patients were included in this study. Samples were taken from a fresh surgical specimen of primary OSCC. Digital imaging of samples was performed within 60 min of resection using OMIS device. Images were processed through a specifically designed convolution algorithm based on light-matter interaction. As a result a convolution spectrum was generated. Predictive value of spectral data was assessed using correlation tests and Naive Bayes classification model.ResultsThere was no significant correlation in distribution of characteristic peaks between tumor and non-tumor tissue (P>0.05). Tumor tissue showed more magnetic activity compared to non-tumor tissue. Naive Bayes classifier with kernel density estimation discriminated tumor from non-tumor tissue with the accuracy of 82.61%, 86.96% sensitivity, 78.26% specificity and the AUC value of 0.917.ConclusionOMIS seems to be a promising optical method for ex vivo characterization of OSCC and non-tumor tissue. Further investigation is necessary to determine how tissue type and level of pathological transformation impact OMIS results. Ultimately, this could aid surgeons in using this method as an in vivo indicator for surgical resection with safe margins.
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- 2019
33. IR spectroscopy of the higher fullerene C84-D2:22 for its qualitative and quantitative determination
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Jovanović, Tamara, Koruga, Đuro, Mitrović, Aleksandra, Stamenković, Dragomir, Tomić, Marija, and Rosić, Šakota
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ComputingMilieux_MISCELLANEOUS - Abstract
International Conference of Experimental and Numerical Investigations and New Technologies
- Published
- 2018
34. Determination of New UV/VIS Spectroscopic Parameters for the Quantitaive Determination of Fullerene Nanomaterials
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Jovanović, Tamara, Koruga, Đuro, Mitrović, Aleksandra, and Stamenković, Dragomir
- Abstract
Proceedings of the Twentieth Annual Conference YUCOMAT 2018
- Published
- 2018
35. IR and UV/VIS Spectroscopic Characterization of the Higher Fullerene C76-D2 for its Quantitative and Qualitative Determination
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Jovanović, Tamara, Jovanović, Tamara, Koruga, Đuro, Mitrović, Aleksandra, Stamenković, Dragomir, Dević, Gordana, Jovanović, Tamara, Jovanović, Tamara, Koruga, Đuro, Mitrović, Aleksandra, Stamenković, Dragomir, and Dević, Gordana
- Published
- 2018
36. Soft contact lenses nanomaterial characterization by atomic force microscopy and lacunarity method
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Mitrović, Aleksandra, Bojović, Božica, Stamenković, Dragomir, Conte, Manuel, and Koruga, Đuro
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ComputingMilieux_MISCELLANEOUS - Abstract
International Conference of Experimental and Numerical Investigations and New Technologies
- Published
- 2017
37. Comparative Spectroscopic Characterization of Fullerene Nanomaterials
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Jovanović, Tamara, Koruga, Đuro, Mitrović, Aleksandra, and Stamenković, Dragomir
- Abstract
Proceedings of the Nineteenth Annual Conference YUCOMAT 2017
- Published
- 2017
38. IR Spectroscopy of the Higher Fullerene C76-D2 for its Qualitative and Quantitative Determination
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Jovanović, Tamara, Koruga, Đuro, and Stamenković, Dragomir
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ComputingMilieux_MISCELLANEOUS - Abstract
International Conference on Experimental and Numerical Investigations and New Technologies CNN TECH 2017
- Published
- 2017
39. Pravci daljeg razvoja, BIOMEDICINSKA FOTONIKA
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Koruga, Đuro, Koruga, Đuro, Tomić, Marija, Stamenković, Dragomir, Rosić, Šakota, Golubović, Zorana, Koruga, Đuro, Koruga, Đuro, Tomić, Marija, Stamenković, Dragomir, Rosić, Šakota, and Golubović, Zorana
- Published
- 2013
40. Nanophotonic Rigid Contact Lenses: Engineering and Characterization
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Koruga, Đuro, Koruga, Đuro, Stamenković, Dragomir, Đuričić, Ivan, Mileusnić, Ivana, Šakota, Jovana, Bojović, Božica, Golubović, Zorana, Koruga, Đuro, Koruga, Đuro, Stamenković, Dragomir, Đuričić, Ivan, Mileusnić, Ivana, Šakota, Jovana, Bojović, Božica, and Golubović, Zorana
- Published
- 2013
41. The IR Spectra, Molar Absorptivity, and Integrated Molar Absorptivity of the C76-D2 and C-84-D-2:22 Isomers
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Jovanović, Tamara, Koruga, Đuro, Jovančićević, Branimir, Jovanović, Tamara, Koruga, Đuro, and Jovančićević, Branimir
- Abstract
The FT-IR spectra of the stable C-76 and C-84 isomers of D-2 symmetry, isolated by the new, advanced extraction and chromatographic methods and processes, were recorded by the KBr technique, over the relevant region from400 to 2000 cm(-1), at room temperature. All the observed infrared bands are in excellent agreement with the semiempirical QCFF/PI, DFT, and TB potential calculations for these fullerenes, which is presented in this article, as the evidence of their validity. The molar absorptivity epsilon and the integrated molar absorptivity psi of their IR absorption bands were determined and reported together with the relative intensities. Excellent agreement is found between the relative intensities of the main and characteristic absorption maxima calculated from epsilon(lambda) and from the psi(lambda) values in adequate integration ranges. These results are significant for the identification and quantitative determination of the C-76-D-2 and C-84-D-2:22 fullerenes, either in natural resources on Earth and in space or in artificially synthesized and biomaterials, electronic, optical, and biomedical devices, sensors, polymers, optical limiters, solar cells, organic field effect transistors, special lenses, diagnostic and therapeutic agents, pharmaceutical substances in biomedical engineering, and so forth.
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- 2017
42. Lacunarity properties of nanophotonic materials based on poly(methyl methacrylate) for contact lenses
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Tomić, Marija, Tomić, Marija, Bojović, Božica, Stamenković, Dragomir, Mileusnić, Ivana, Koruga, Đuro, Tomić, Marija, Tomić, Marija, Bojović, Božica, Stamenković, Dragomir, Mileusnić, Ivana, and Koruga, Đuro
- Published
- 2017
43. Optomagnetic Imaging Spectroscopy Application in Cervical Dysplasia and Cancer Detection: Comparation of Stained and Unstained Papanicolaou Smears
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Jeftić, Branislava, Papić-Obradović, Milena, Munćan, Jelena S., Matija, Lidija, Koruga, Đuro, Jeftić, Branislava, Papić-Obradović, Milena, Munćan, Jelena S., Matija, Lidija, and Koruga, Đuro
- Abstract
Cervical cancer is the fourth most common cancer worldwide. The fact that cervical cancer takes many years to develop indicates that mortality rates can be significantly decreased with early detection. This is why screening tests for early cervical cancer detection are so important, especially in developing countries where screening programs are not available to the same extent as in developed countries. About 84% of all cervical cancer cases in 2012 occurred in less developed countries mainly due to the lack of effective screening programs. Even if the necessary infrastructure in one country exists, the cost of screening test is usually too high. Finally, the accuracy of screening test needs to be satisfying in order to detect all the abnormal cases and treat them effectively. Papanicolaou test is still the most effective screening test for cervical cancer detection so far. However, the accuracy of Papanicolaou test is closely related to the expertise of the cytopathologist and therefore the accuracy varies producing relatively low sensitivity of Papanicolaou test (50-85%). HPV DNA test is approved as primary screening test, but so far it gives better results when it is used in conjunction with cytology. We present a method and device for detection of cervical cancer based on optomagnetic imaging spectroscopy (OMIS) and compare the results for cancer detection using stained and fresh unstained cervical cell samples. Compared to stained samples, unstained fresh sample classification by OMIS into healthy/cancerous group with Na lt ve Bayes classifier gave higher accuracy (96% compared to 85,18%).
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- 2017
44. Classical and quantum information channels in protein chain
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Koruga, Đuro, Koruga, Đuro, Tomić, A., Ratkaj, Z., Matija, Lidija, Koruga, Đuro, Koruga, Đuro, Tomić, A., Ratkaj, Z., and Matija, Lidija
- Abstract
Investigation of the properties of peptide plane in protein chain from both classical and quantum approach is presented. We calculated interatomic force constants for peptide plane and hydrogen bonds between peptide planes in protein chain. On the basis of force constants, displacements of each atom in peptide plane, and time of action we found that the value of the peptide plane action is close to the Planck constant. This indicates that peptide plane from the energy viewpoint possesses synergetic classical/quantum properties. Consideration of peptide planes in protein chain from information viewpoint also shows that protein chain possesses classical and quantum properties. So, it appears that protein chain behaves as a triple dual system: (1) structural - amino acids and peptide planes, (2) energy - classical and quantum state, and (3) information - classical and quantum coding. Based on experimental facts of protein chain, we proposed from the structure-energy-information viewpoint its synergetic code system.
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- 2006
45. Investigation of the HEV Blue Light Blocking Effect of Nanophotonic Material
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Bojović, Božica, Tomić, Marija, Stamenković, Dragomir, and Koruga, Đuro
- Abstract
3rd International Translational Nanomedicine Conference
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- 2015
46. Nanophotonics and the damaging effects of light in ophthalmology
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Stamenković, Dragomir, Bojović, Božica, Tomić, Marija, Šakota, Jovana, and Koruga, Đuro
- Abstract
8. radionica fotonike
- Published
- 2015
47. Characterization of Photonic Nanomaterials for Contact Lenses, Before and After Exposure to External Magnetic Field by Spinner Magnetometer and Optomagnetic Imaging Spectroscopu
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Tomić, Marija, Bojović, Božica, Stamenković, Dragomir, Matija, Lidija, and Koruga, Đuro
- Abstract
3rd International Translational Nanomedicine Conference
- Published
- 2015
48. Gibbson: Peptide plane as a unique biological nanostructure
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Koruga, Đuro, Koruga, Đuro, Tomić, A., Ratkaj, Z., Matija, Lidija, Koruga, Đuro, Koruga, Đuro, Tomić, A., Ratkaj, Z., and Matija, Lidija
- Abstract
In this paper we describe the properties of peptide plane of amino acids from a biophysical point of view. We use Lagrange's equations to calculate the energy states of peptide plain and to explain its biophysical proper-ties. We calculate both the energy distribution of each atom in the peptide plain and the energy distribution of peptide plains in a protein chain. As examples, we make calculations of the energy state for collagen, integrin and tubulin peptide chains. We found out that there are no two peptide plains with the same energy state in a single protein chain. Energy distribution of peptide plains is predicted by Gibbs statistics distribution and therefore we named the peptide plain Gibbson. The Gibbson is an elementary quasi particle, "biological condensate", on a nanometer scale. The relationship between Gibbs' energy distribution of collagen, integrin and tubulin opens a new view for understanding cells and tissues communication. This knowledge could be relevant for nanoscience, biomedicine and nanotechnology.
- Published
- 2004
49. The IR Spectra, Molar Absorptivity, and Integrated Molar Absorptivity of the C76-D2and C84-D2:22 Isomers
- Author
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Jovanović, Tamara, primary, Koruga, Đuro, additional, and Jovančićević, Branimir, additional
- Published
- 2017
- Full Text
- View/download PDF
50. Monte Carlo simulation of light transport through lens
- Author
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Miljković, Vladimir M., Miljković, Vladimir M., Mitrović, Aleksandra, Stamenković, Dragomir, Popović, Dejana P., Koruga, Đuro Lj., Miljković, Vladimir M., Miljković, Vladimir M., Mitrović, Aleksandra, Stamenković, Dragomir, Popović, Dejana P., and Koruga, Đuro Lj.
- Abstract
A Monte Carlo model of steady state light transport in contact lenses has been coded in ANSI Standard C. The Monte Carlo simulation offers a flexible, yet rigorous approach to photon transport in tissue which can be applied on the lenses as well. The method describes local rules of photon propagation that are expressed as probability distributions. However, the method is statistical and as such relies on calculating the propagation of large number of photons. As a result, this method requires a large amount of computational time. This method is applied on the lenses and the obtained results are presented. The results confirm the possibility for the theoretical prediction of optical properties of materials.
- Published
- 2016
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