The application of chitosan-based micropowders in development of latent fingermarks

Latent fingermarks are common type of traces found at the crime scene. Therefore, their visualization and enhancement are widely used techniques in identification of offenders and accomplices by law enforcement agencies worldwide. Chemical and physical methods seemed to be reliable for that purpose and have now been used for years. Therefore, researchers focus their work in order to discover new methods for detection and visualization of latent fingermarks. In this regard, the usage of polymeric materials, especially biopolymers, has not yet been sufficiently tested, and scientific public is almost unaware of the potential of these materials in forensic science. In this paper, conjugates based on chitosan were obtained by the precipitating method and their application in detection and visualization of latent fingermarks was examined. The results demonstrated that this bio-based powder system could be potentially used as substitutes for commercially used powders in detecting and visualizing of latent fingermarks

Detection and enhancement of latent fingerprints using dextran-based biopolymer powders obtained from anthocyanin solution

Dextran is extensively exploited in medicine and pharmacy, but, currently no studies using this biopolymer as a powder system for enhancement of latent fingerprints were published. In this paper four different formulations of dextran-based biopolymer powders, obtained by simple precipitation of dextran within anthocyanin solution, were synthetized and characterized in order to determine potential of these biopowders in forensic application. Since detrimental effect on humans is often present while routinely employing commercial dusting methods, the main advantage of prepared dextran-based biopowders are their non-toxic properties, contributing to the safer/healthier operating conditions. The interactions between components of the systems were confirmed by FT-IR analysis. Optical microscopy was used to determine the size of the prepared biopowders, while simultaneously confirmed the interaction between powders and the sweat/lipid residues present in the latent trace. The results demonstrated the potential of novel dextran-based biopowders to supplement routinely employed physical systems in visualizing latent fingerprints

Characterization and potential application of dextran-based biopolymer powder obtained from Hydrangea macrophylla liquid anthocyanins extract by ultrasonic extraction

Biopolymers have numerous advantages, such as their biodegradable, non-toxic, non-inflammatory and biocompatible properties, and, therefore, have a potential for various applications. In this paper dextran-based biopolymer powder, obtained from Hydrangea macrophylla liquid anthocyanins extract by ultrasonic extraction and simple precipitating method, was synthetized and characterized in order to determine its properties and potential application. Attenuated total reflectance Fourier-transform infrared spectroscopy (ATR FT-IR) analyses showed interactions between the components of the system. Optical microscopy suggested that the prepared biopowder formulation was small and somewhat uniform in size, and also showed its easy binding to the fingerprint residues. Additionally, the prepared biopolymer powder was used to visualize latent fingerprints left on different non-porous and semi-porous surfaces, i.e. flat wood, glass, plastic and rubber. The results demonstrated the potential of the obtained dextran-based biopowder to complement routinely applied systems in developing latent fingerprints

Analysis of soybean production and biogas yield to improve eco-marketing and circular economy

In the study attempts to analyze soybean production and possibility obtaining biogas from soybean biomass, in order to obtain energy inputs into the profit function and realized a circular economy. This paper presents the results of five-year studies of soybean production analysis in the world and in Serbia, and was also examined soybeans morphoproductive characteristics and on the biogas yield, of the Favorit variety, produced in Pančevo, Serbia. Serbia has excellent conditions for soybeans production. The maximum soybean biomass yield of soybean variety Favorit was 5 t ha-1. The average biogas yield, for tested five years, was 368 m3ha-1. The biogas yield was in positive statistically significant correlations on the plant height (r=0.65*) and in positive correlations with biomass yield. Soybean cultivar with their characteristics justify the sowing and can be used as a raw material in bio-fuels production

COOPERATION BETWEEN AGRICULTURAL ЕXTENSION SERVICES AND COOPERATIVES – THE STATE AND POSSIBILITIES

One of the key links in the system of knowledge and information transfer in Serbian agriculture is the extension service, which acts as a mediator between scientific institutions and different user groups. Extension officers prefer to cooperate with already formed user groups, such as agricultural cooperatives, because they unite farmers with similar production and are convenient for group methods of extension work. This paper aims to examine the quality of cooperation between agricultural extension services and agricultural cooperatives in Serbia and to evaluate the views of farmers (cooperative members) on the success of this cooperation. For this research, a survey was conducted with 220 respondents, members of agricultural cooperatives. The analysis showed that over 80% of cooperative members cooperated with extension service, and that they were more satisfied with the quantity of extension services than with the quality. More than half of the respondents believe that extension services need to be adapted to the needs of cooperatives, and that the cooperatives should be given more attention in the media appearances of extension officers. This research provides an important insight into the form and specifics of cooperation between agricultural extension services and agricultural cooperatives, on the basis of which measures for their continuous improvement can be proposed. Copyright © 2023 Authors

PSYCHIATRIC CONSEQUENCES OF STRESS AFTER A VEHICLE ACCIDENT

Background: Vehicle accidents are a common cause of disease and death among people over 30 years of age. Essentially, reaction to stress due to the vehicle accident does not differ from the reaction to other stress factors. There are still no uniform viewpoints about the kind of sequels and their percentage representation after vehicle accidents. Subjects and methods: The research was provided as a prospective study, included 150 subjects who had vehicle accident minimum 2 years prior to the examination. A questionnaire adjusted to the needs of the research and a battery of psychological tests was used. Results: Affective disorders occurred in 35.33% of subjects, 65% of persons suffer from travel anxiety, 9% of the total number of examinees doesn’t drive any more, 65% have somatisational dysfunctions of the vegetative nervous system, while the posttraumatic stress disorder is present in 36% of subjects. Conclusion: In 87.4% of persons psychiatric consequences last over two years. Long term consequences in 60% of subjects occur as a combination of multiple psychiatric disorders, so the posttraumatic stress disorder and affective disorders never occur one at a time

Genotype by year interaction effects on soybean morpho-productive traits and biogas production

Biodiesel and biogas are especially important sources of renewable energy in the world and in Serbia. Biodiesel is used as transportation fuel; biogas is used for production of electricity and heat. Soybean (Glycine max L.) grain is the primary source of vegetable protein for food and feed supplements, also accounts for much of the world's bio-oil supply. Due to the development of new technologies for processing agricultural waste into energy, the rate of increase in the use of alternative fuels is significantly increasing. The aim of this study was to determine the productivity of soybeans and the possibility of obtaining biogas from soybeans in divergent years, 2017-2019. Main effects were monitored, genotypes (G), years (Y) and genotype by years interaction effects (G x Y) and were used for evaluation of soybean genotypes in different environments. Soybean varieties were tested for mass of 1000 grain (MTG), plant height (PH), grain yields (GY) and biogas yield (BY). Stability of grain and biogas yield was determined to select best genotype. Results showed that genotype and years had a significant impact on all measured variables. In all tested years, the biggest GY and BY were at genotypes G1 (2.40-4.49 t ha(-1), and 461.00-641.00 m(3) ha(-1), respectively) and G3 (1.97-4.30 t ha(-1); i.e. 447.67-620.00 m(3) ha(-1)). Genotype G2 had statistically significantly lower values for all tested parameters compared to other tested genotypes. Correlation analysis of some chosen traits showed different interdependence between measured variables depending on the year conditions. The results of this study pointed out that among best genotypes for production of grain and biogas were G1 and G3. From the results of this study it can be concluded that G x Y trials are important for evaluation of stability and choosing the most stable genotypes of soybean

Autologous blood coagulum containing rhBMP6 induces new bone formation to promote anterior lumbar interbody fusion (ALIF) and posterolateral lumbar fusion (PLF) of spine in sheep

resent study, we evaluated an autologous bone graft substitute (ABGS) composed of recombinant human BMP6 (rhBMP6) dispersed within autologous blood coagulum (ABC) used as a physiological carrier for new bone formation in spine fusion sheep models. The application of ABGS included cervical cage for use in the anterior lumbar interbody fusion (ALIF), while for the posterolateral lumbar fusion (PLF) sheep model allograft devitalized bone particles (ALLO) were applied with and without use of instrumentation. In the ALIF model, ABGS (rhBMP6/ABC/cage) implants fused significantly when placed in between the denuded L4- L5 vertebrae as compared to control (ABC/cage) which appears to have a fibrocartilaginous gap, as examined by histology and micro CT analysis at 16 weeks following surgery. In the PLF model, ABGS implants with or without ALLO showed a complete fusion when placed ectopically in the gutter bilaterally between two decorticated L4-L5 transverse processes at a success rate of 88% without instrumentation and at 80% with instrumentation ; however the bone volume was 50% lower in the instrumentation group than without, as examined by histology, radiographs, micro CT analyses and biomechanical testing at 27 weeks following surgery. The newly formed bone was uniform within ABGS implants resulting in a biomechanically competent and histologically qualified fusion with an optimum dose in the range of 100 g rhBMP6 per mL ABC, while in the implants that contained ALLO, the mineralized bone particles were substituted by the newly formed remodeling bone via creeping substitution. These findings demonstrate for the first time that ABGS (rhBMP6/ABC) without and with ALLO particles induced a robust bone formation with a successful fusion in sheep models of ALIF and PLF, and that autologous blood coagulum (ABC) serves as a preferred physiological native carrier to induce new bone at low doses of rhBMP6 and to achieve a successful spinal fusion

Video game development in Unreal Engine tools

U ovom radu opisali smo osnovne koncepte Unreal Engine-a uz koje možemo započeti rad na novom projektu. Uz ove koncepte i daljnjim proširivanjem znanja proučavanjem alata kroz službenu dokumentaciju moguće je napraviti tehnološki kompleksne projekte koje ne bismo bili u mogućnosti napraviti bez Unreal Engine alata ili bilo kojeg drugog pokretača igara. Za potrebe ovog diplomskog rada napravljena je video igra u UE alatima čiji smo žanr, pravila, strukturu programa i klase opisali u radu. Također smo se upoznali s dizajnom server-klijent aplikacije i detaljnije opisali način na koji funkcioniraju i komuniciraju međusobno sudionici. Koristeći boost biblioteku i moderni C++17 standard implementirali smo asinkroni server i definirali poruke za komunikaciju. Za potrebe razmjenjivanja složenijih struktura podataka preko mreže koristeći poruke implementirali smo i detaljno opisali naš JSON parser.In this master thesis we elaborated the basic concepts of Unreal Engine with which we can start working on a new project. With those concepts and further expanding knowledge by reading official documentation, it is possible to create technologically complex projects that we would not be able to do so without Unreal Engine tool or any other tool for game launching. For the purposes of this thesis, the video game was made in UE tools. Its genre, rules and program structure are described in the paper. Also, the design of the server-client application is introduced. The way participants function and communicate with each other is described in detail. Using the boost library and the modern C ++ 17 standard, we have implemented an asynchronous server and defined messages for communication. For the purpose of exchanging more complex data structures over the network using messages, we have implemented and described in detail our JSON parser