Ultrasound modifications of physical properties of BaTiO3 powders

The starting BaTiO3 powder was prepared by solid state reaction, and then modified by ultrasound into powders with different physical characteristics. The prepared barium titanate powders were characterized by X-ray powder diffraction (XRD), laser particle size analyzer, also, specific surface area and powders density were determined. The studies indicate that physical properties of BaTiO3 powders were changed by sonochemical treatment. However, tetragonal crystal structure was maintained. It is shown that sonochemical method can be used for easy modification of barium titanate powder characteristics.Physical chemistry 2006 : 8th international conference on fundamental and applied aspects of physical chemistry; Belgrade (Serbia); 26-29 September 200

Ultrasound modifications of physical properties of BaTiO3 powders

The starting BaTiO3 powder was prepared by solid state reaction, and then modified by ultrasound into powders with different physical characteristics. The prepared barium titanate powders were characterized by X-ray powder diffraction (XRD), laser particle size analyzer, also, specific surface area and powders density were determined. The studies indicate that physical properties of BaTiO3 powders were changed by sonochemical treatment. However, tetragonal crystal structure was maintained. It is shown that sonochemical method can be used for easy modification of barium titanate powder characteristics.Physical chemistry 2006 : 8th international conference on fundamental and applied aspects of physical chemistry; Belgrade (Serbia); 26-29 September 200

Uticaj etarskih ulja na ishranu jedinki domaćeg miša: II - mamci na bazi bromadiolona i difenakuma sa dodatkom 0.75% etarskog ulja cimeta u praktičnim uslovima primene

The effects of 0.75 % concentration of cinnamon essential oil on bait attractiveness and total biological efficacy of bromadiolone and difenacoum rodenticides to the house mouse were tested in practice. The experiments were conducted in storages with stable house mouse populations for which no resistance to anticoagulant rodenticides had been previously reported. A statistically significant difference was detected between bromadiolone and difenacoum baits. Consumption of bromadiolone baits supplemented with cinnamon essential oil was 74 % higher than the consumption of bromadiolone baits without cinnamon oil. The average efficacy of bromadiolone baits in controlling house mice was 96 %. Cinnamon essential oil added to difenacoum baits increased bait consumption by 39 %, i.e. it was 119 % higher than the consumption of oil-free baits. The average efficacy of difenacoum baits in controlling house mice was 99.5 %.Utvrđen je uticaj etarskog ulja cimeta, u koncentraciji 0.75 %, na ispoljavanje atraktivnosti mamaca, kao i ukupna biološka efikasnost aktivnih materija bromadiolona i difenakuma za domaćeg miša u praktičnim uslovima primene. Eksperimenti su izvedeni u skladišnim objektima, sa stabilnim populacijama domaćeg miša, za koje nije bila utvrđena rezistentnost na antikoagulantne rodenticide. Utvrđena je statistički značajna razlika između ispitivanih mamaca na bazi bromadiolona i ispitivanih mamaca na bazi difenakuma. Mamci na bazi bromadiolona, sa sadržajem etarskog ulja cimeta, prosečno su bili konzumirani za 74 % više od mamaca na bazi bromadiolona u kojima nije bilo dodatka ulja. Prosečna ukupna efikasnost ovih mamaca u suzbijanju domaćeg miša bila je 96 %. Povećanje konzumacije mamaca na bazi difenakuma sa dodatim eteričnim uljem cimeta u ovom eksperimentu bila je za 39 %, odnosno 119 % viša u odnosu na mamce bez dodatka eteričnog ulja. Prosečna ukupna efikasnost ovih mamaca bila je 99,5 % u suzbijanju domaćeg miša

Uticaj etarskih ulja na ishranu jedinki domaćeg miša: I - cimet i karanfilić ispitivani u skladištima

The effect of cinnamon (Cinnamomi zeylanicum) and clove (Eugenia caryophyllata) essential oils on the acceptibility of cereal-based baits to house mice in storage facilities was examined. The effects of three concentrations, 0.5, 0.75 and 1 %, were tested for optimization purposes. The experiments were performed in a mill storage, and in another storage for seeds and seedlings. Attractiveness of the examined concentrations of cinnamon and clove essential oils was statistically significant, compared to placebo bait, within seven days of the experiment. On the seventh day, the average consumption of baits containing 0.75 % and 1 % concentrations of cinnamon oil was 46 % in the mill storage, i.e. 35.5 % more than placebo baits were consumed. Fourteen days after the beginning of the experiment, no significant difference was detected in the consumption of baits offered in the mill storage. On the other hand, a significant difference was revealed regarding the consumption of examined baits in the seed and seedling storage. The average consumption of baits containing 0.75 % and 1 % cinnamon oil was 47 % and 51 % higher after 14 days than the consumption of placebo bait. Compared to the other test baits, those containing cinnamon essential oil at 0.75 % and 1 % concentration demonstrated better attractiveness without mutual statistically significant differences.Utvrđivan je uticaj etarskih ulja cimeta (Cinnamomi zeylanicum) i karanfilića (Eugenia caryophyllata) na prihvatljivost mamaka na bazi žita za domaćeg miša u skladišnim uslovima. U ciju optimizacije sadržaja etarskog ulja, ispitivan je efekat tri različite koncentracije, 0.5, 0.75 i 1 %. Eksperimenti su izvedeni u skladišnim objektima mlina i objektima za skladištenje semenskog i sadnog materijala. Atraktantno delovanje ispitivanih koncentracija etarskih ulja cimeta i karanfilića u odnosu na placebo mamac bilo je statistički značajno od početka pa do sedmog dana eksperimenta. Sedmog dana, u objektima mlina, prosečna konzumacija mamaca sa sadržajem etarskog ulja cimeta u koncentracijama od 0.75 % i 1 % bila je do 46 %, odnosno 35.5 % viša u odnosu na placebo mamac. Četrnaestog dana nije zabeležena statistički značajna razlika u konzumaciji ponuđenih mamaca u objektima mlina. U skladišnim objektima semenskog i sadnog materijala, zabeležena je statistički značajna razlika u konzumaciji ispitivanih mamaca. Prosečna konzumacija mamaka sa sadržajem od 0.75 % i 1 % etarskog ulja cimeta, četrnaestog dana od početka eksperimenta bila je za 47 %, odnosno 51 % viša u odnosu na placebo mamac. U odnosu na druge ispitivane mamce, mamci sa sadržajem etarskog ulja cimeta u koncentracijama od 0.75 % i 1 % ispoljili su atraktantnije delovanje u odnosu na druge mamce i međusobno se nisu statistički značajno razlikovali

Response of wild Mus musculus to baits containing essential oils: I - Cinnamon and clove tested in storage facilities

The effect of cinnamon (Cinnamomi zeylanicum) and clove (Eugenia caryophyllata) essential oils on the acceptibility of cereal-based baits to house mice in storage facilities was examined. The effects of three concentrations, 0.5, 0.75 and 1 %, were tested for optimization purposes. The experiments were performed in a mill storage, and in another storage for seeds and seedlings. Attractiveness of the examined concentrations of cinnamon and clove essential oils was statistically significant, compared to placebo bait, within seven days of the experiment. On the seventh day, the average consumption of baits containing 0.75 % and 1 % concentrations of cinnamon oil was 46 % in the mill storage, i.e. 35.5 % more than placebo baits were consumed. Fourteen days after the beginning of the experiment, no significant difference was detected in the consumption of baits offered in the mill storage. On the other hand, a significant difference was revealed regarding the consumption of examined baits in the seed and seedling storage. The average consumption of baits containing 0.75 % and 1 % cinnamon oil was 47 % and 51 % higher after 14 days than the consumption of placebo bait. Compared to the other test baits, those containing cinnamon essential oil at 0.75 % and 1 % concentration demonstrated better attractiveness without mutual statistically significant differences

Influence of Synthesis Parameters on Structure of 1-D TiO2 nanostructures

The influence of electrochemical conditions and the heat treatment on the crystal structure and the microstructure evolution of TiO2 based nanotubes synthesized by the self-ordering anodization process is investigated in this work. The electrochemical anodization was performed at room temperature, for 30 minutes under 15, 20 and 25 V, with stirring. The as-anodized Ti foils were annealed in air at 450, 600, 650 and 700 °C for 30 minutes. The structure and the lattice dynamics of the samples has been studied by using XRD and Raman spectroscopy methods. The microstructure development of the 1-D TiO2 nanostructures has been analyzed by FESEM

Influence of Synthesis Parameters on Structure of 1-D TiO2 nanostructures

The influence of electrochemical conditions and the heat treatment on the crystal structure and the microstructure evolution of TiO2 based nanotubes synthesized by the self-ordering anodization process is investigated in this work. The electrochemical anodization was performed at room temperature, for 30 minutes under 15, 20 and 25 V, with stirring. The as-anodized Ti foils were annealed in air at 450, 600, 650 and 700 °C for 30 minutes. The structure and the lattice dynamics of the samples has been studied by using XRD and Raman spectroscopy methods. The microstructure development of the 1-D TiO2 nanostructures has been analyzed by FESEM

Genetičko-biohemijske osnove rezistentnosti korovskih biljaka prema herbicidima inhibitorima acetolaktat sintetaze ALS

Genetic and biochemical bases of resistance of weed plants to herbicides that inhibit acetolactate synthetase (ALS) are reviewed. Resistance to sulfonyl urea and imidazolinone herbicides and their new derivative products, namely triazolopyrimidin sulfoanilide, pyrimidinil oxybenzoi acid, non-aromatic imidazolinone and sulphonyl carboxiamide is discussed. The main biosynthetic pathway of amino acids with branching chains (valine, isoleucine and leucine) is shown, as well as the herbicides' mechanisms of inhibition of ALS enzyme. Mechanisms of weed resistance to ALS inhibitors are discussed from the aspects of mechanism of resistance located on the primary site of activity, mechanism of resistance based on metabolism of herbicides, mechanism of resistance based on cross-resistance located on the primary site of activity and outside the primary site. Special attention is focused on the mechanism of resistance based on multiple resistance. For all cases of developing resistance, examples are cited of instances of change and mutation on the primary site of activity in region A of the ALS gene leading to an exchange of individual amino acids within ALS molecules. Special attention is focused on natural plant tolerance to ALS inhibitors, which is attributed to herbicide metabolism, brief lif span of created intermediaries during the metabolic process and forming of conjugates with significantly reduced herbicide activity

Variable use of amiodarone is associated with a greater risk of recurrence of atrial fibrillation in the critically ill

Background: Atrial fibrillation is a common rhythm disturbance in the general medical-surgical intensive care unit. Amiodarone is a popular drug in this setting but evidence to inform clinical practice remains scarce. We aimed to identify whether variation in the clinical use of amiodarone was associated with recurrent atrial fibrillation