Antifungal activities of basil (Ocimum basilicum L.) extract on Fusarium species

The basil extract composition was determined by the GC-MS method and 38 different components were identified. The major components of the basil extract were estragol (86.72%), trans-α-bergamotene (2.91%), eucalyptol (2.67%), trans-ocimene (1.04%), linalool (0.72%), methyl-eugenol (0.71%), etc. The antifungal potential of the basil extract was tested against Fusarium oxysporum, F. proliferatum, F. subglutinans, and F. verticillioides isolated from cakes, using the agar plate method. Extract concentrations of 0.35 and 0.70% (v/v) significantly inhibited the growth of F. proliferatum (33.37 and 44.30%, respectively) and F. subglutinans (24.74 and 29.27%, respectively) whereas other investigated Fusarium species exhibited much lower sensitivity. The basil extract completely inhibited the growth of investigated Fusarium spp. at the concentration of 1.50% (v/v). Higher concentrations (0.35 and 0.70% (v/v)) reduced growth of aerial mycelium in all tested species. Strong medium pigmentation in the case of F. proliferatum and F. verticillioides was observed. The microscopic examination of the samples confirmed the presence of hyphae deformations with a frequent occurrence of fragmentations, thickenings and diminished sporulation. In addition to the basic, sensory, role the extract of basil has in the food product, it exerted significant antifungal properties, depending on its concentration.Key words: Basil (Ocimum basilicum L.) extract, components, antifungal activity, Fusarium spp

Kinematika kompleksne višeosne i viševretene mašine alatke namenjene za proces obrade glodanjem

U okviru ovog rada je prikazana analiza jedne višeosne i viševretene mašine alatke namenjene za proces obrade glodanjem. Prema svojoj konfiguraciji, razmatrana mašina alatka se može okarakterisati kao glodalica horizontalno-vertikalnog tipa što je svrstava u grupu multifunkcionalnih mašina alatki. Mašina alatka se prema više kriterijuma može okarakterisati kao mašina alatka rekonfigurabilnog tipa i u zavisnosti od potreba se može konfigurisati za 3-osnu, 4-osnu ili 5-osnu obradu glodanjem. Konfiguracija mašine alatke poseduje dva nezavisna dvoosna rekonfigurabilna paralelna mehanizma što samu mašinu alatku svrstava u grupu kompleksnih mašina alatki

Strategija 3+2 Osne Obrade Na Novoj Brusilici Za Izradu Profilnih Koturastih Glodala

Rezni alati predstavljaju važan segment u finalnoj obradi drveta. Rezni alati svojom složenom geometrijom omogućuju da se, u jednom prolazu, naprave složene površine na izratku koje su ranijih godina mogle da se kreiraju u više prolaza, korišćenjem manje složenih alata, uz obavezno prisustvo vrlo iskusnih operatera na mašinama. Izrada profilnih koturastih glodala pored konvencionalnih mašina alatki zahteva i petoosnu CNC brusilicu koja profiliše sečivo alata koje je složenog oblika. U ovom radu posebna pažnja posvećena je strategiji 3+2 osne obrade na novoj CNC brusilici uzimajući u obzir činjenicu da je na istoj napravljen veliki broj profilnih koturastih glodala čime je potvrđena industrijska primena nove CNC brusilice i uspostavljene tehnologije

Fundamentals of Multi-User MIMO Communications

In recent years, the remarkable promise of multiple-antenna techniques has motivated an intense research activity devoted to characterizing the theoretical and practical issues associated with multiple-input multiple-output wireless channels. This activity was first focused primarily on single-user communications but more recently there has been extensive work on multi-user settings. The aim of this chapter is to provide an overview of the fundamental information-theoretic results and practical implementation issues of multi-user multiple-antenna networks operating under various conditions of channel state information

Trade-off Analysis of Energy-Efficiency versus Generated Interference when using Regenerative Relay

When using a regenerative relay, a trade-off between increasing the energy efficiency versus reducing the generated interference arises. In this paper, the generated interference in the direct link from the base station to a user terminal is compared with the generated interference from both the base station and the relay node in regenerative relay transmissions. In the space of channel losses, in the transceivers' operating region, the lines corresponding to the generated interference ratio comparing the relay scheme and the direct link are depicted. It is shown that it is possible to tune the energy-efficiency vs generated interference trade-off, by adjusting the transmit powers, constellation size and code rate. The trade-off depends on the channel losses along the links. A key enabler of the trade-off is the appropriate placement of the relay node

Sistem za upravljanje industrijskim robotima realizovan primenom savremenih softverskih alata za rad u realnom vremenu

G. Ferenc, Z. Dimić, V. Kvrgić, V. Cvijanović, Sistem za upravljanje industrijskim robotima realizovan primenom savremenih softverskih alata za rad u realnom vremenu, Kosisnik: Tehnička škola, Železni

Distributed Robot Control System Based on the Real-Time Linux Platform

Abstract: Flexible and user-friendly virtual environment, Lola Robot Simulator, was developed to simulate andsupervise robot cells. 3D graphic visualisation of robots and their environment, automatic and manual movement ofvirtual robot axes and end-effector trajectory tracing are implemented through open-source tools on Linux platform.In this paper, a short presentation of the Lola Robot Simulator will be given, with emphasis on main features of thesystem. Lola Robot Simulator was successfully applied to a robot cell comprised of two industrial robots –“Lola15” and “Lola50” and a track guided vehicle “Robo1000” (PDF) System for Simulation and Supervision of Robotic Cells

Distribuirani sistem za kontrolu robota korišćenjem CORBA protokola

Maja Lutovac, Z. Dimić, G. Ferenc, J. Vidaković, V. Kvrgić, Distribuirani sistem za kontrolu robota korišćenjem CORBA protokola, Zbornik radova 56. Konferencija ETRA

Influence of Polyglycidyl-type Bonding Agents on the Viscoelastic Properties of a Carboxyl-terminated Poly(butadiene-co-acrylonitrilе)-based Composite Rocket Propellant

In the present study, functionally substituted bonding agents (triglycidyl isocyanurate and diglycidyl dimethylhydantoin) were incorporated into a composite propellant formulation based on carboxyl-terminated poly(butadiene-co-acrylonitrilе) and ammonium perchlorate. Bonding agents are an important component of a composite propellant, making up to 0.5 wt.% of the formulation. They affect processing, mechanical properties, ballistics, ageing and the characteristics of insensitive munition (IM) propellants. All of the testing has been done using an unmetallized propellant formulation (80 wt.% bimodal ammonium perchlorate and 20 wt.% binder). The focus has been on the mechanical properties of the propellant, as influenced by the presence of these bonding agents. Mechanical uniaxial tensile tests were accompanied by a dynamic mechanical analysis (DMA) over a wide range of temperatures. The storage modulus, loss modulus, loss factor and glass transition temperature for each propellant sample have been evaluated. The network characteristics, such as sol-gel content and crosslink density have been calculated and successfully correlated with the mechanical properties. The dynamic mechanical studies showed that the content of the bonding agent did not influence the glass transition temperature; however, the loss factor was shown to be a function of the crosslink density

Reduction of sterigmatocystin biosynthesis and growth of food-borne fungi by lactic acid

© 2020 BMFH Press. Food contamination by fungi and mycotoxins presents a problem for food safety even today. Since lactic acid (LA) has Generally Recognized As Safe (GRAS) status, the aim of this research was to determine its potential in protection of food against mycological and mycotoxicological contamination. In this study, LA showed an inhibitory effect on the growth of food-borne fungi (Penicillium aurantiogriseum K51, Aspergillus parasiticus KB31, Aspergillus versicolor S72, and Aspergillus niger K95) and on biosynthesis of sterigmatocystin (STE). For the antifungal effect of LA on the growth of food-borne fungi, the disc diffusion and microdilution methods were performed. The effect of LA on the STE biosynthesis by A. versicolor was determined using an LC-MS/MS technique. The largest inhibition zone was observed for A. versicolor (inhibition zone of 24 ± 0.35 mm), while there were no inhibition zones for A. niger and A. parasiticus at all tested LA concentrations. The minimal inhibitory concentration (MIC) of LA on fungi ranged from 25.0 mg/mL to 50.0 mg/mL, while the minimum fungicidal concentrations (MFCs) ranged from 50.0 mg/mL to 100.0 mg/mL. Complete inhibition of STE biosynthesis by A. versicolor was observed at an LA concentration of 50.0 mg/mL. The obtained results showed that LA could be efficient for protection of food against mycological and STE contamination