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  • Author: Danuta Nowak x
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Open access

Danuta Kulpa and Natalia Nowak

In vitro flowering of Petunia × atkinsiana D. Don

The aim of this study was an attempt to determine the influence of PGRs - auxins, cytokinins and gibberellic acid - on the flowering and morphogenesis of ‘Flash Red’ Petunia × atkinsiana D. Don in vitro. The best results at the propagation stage were obtained on an MS medium supplemented with 0.5 mg dm-3 GA3. The petunia plants propagated under these conditions developed high main shoots and a large number of leaves and adventitious shoots. The plants with the best-developed root system were regenerated on an MS medium supplemented with 0.5 and 1.0 mg dm-3 IAA. Flowering initiation should be performed using an MS medium supplemented with 0.5 mg dm-3 KIN.

Open access

Jan Kalembkiewicz, Elżbieta Sitarz-Palczak, Eleonora Soćo, Danuta Nowak and Irena Trojnar

Abstract

The atmospheric fallout over the Rzeszów town was investigated. Intensity of dustfall (quarterly periods, 2011.2012) and its physicochemical properties (acid-base character, solubility and sequential solubility, mobile fractions) were investigated. The intensity of dustfall was variable from 25 to 83 g·m.2 and depended on the season. Contents of metals in precipitation were diverse with quantities exceeding 1%: Fe, K, Ca, Na, in 0.1.1%: Mg, Zn, Na, Ca, Mn, Ni, Co, Cr, and less than 0.1%: Cu, Bi, Cr, Mn, Ni, Pb. It was found that the dustfall is a possible source of metals. The atmospheric fallout can enlarge a pool of metals in soils from 0.18% up to 80%.

Open access

Katarzyna Gorazda, Zygmunt Kowalski, Regina Kijkowska, Danuta Pawłowska-Kozińska, Zbigniew Wzorek, Marcin Banach and Anna K. Nowak

Abstract

The study presents a technology of sodium tripolyphosphate (STPP) production with the use of a dry, single-stage method. The reacting substrates (concentrated wet-process phosphoric acid - WPPA and solid Na2CO3 ) are mixed with a recycled final product (STPP) in a mixer, then a „quasi-dry” mixture is calcined in a rotary kiln. Thanks to that, some stages of a classic method of STPP production are eliminated: one of the two-stage neutralization of the phosphoric acid with sodium carbonate at temperature ~80°C, filtration of the neutralised solution and its evaporation, as well as the stage of drying a solution of mono- and di-sodium orthophosphate in a spray dryer. According to the presented technical and economical analysis, the costs of STPP production using a single-stage dry method can be 10% lower compared to the classic method.

Open access

Konrad Chabowski, Adam F. Junka, Tomasz Piasecki, Damian Nowak, Karol Nitsch, Danuta Smutnicka, Marzenna Bartoszewicz, Magdalena Moczała and Patrycja Szymczyk

Abstract

The suitability of low-cost impedance sensors for microbiological purposes and biofilm growth monitoring was evaluated. The sensors with interdigitated electrodes were fabricated in PCB and LTCC technologies. The electrodes were golden (LTCC) or gold-plated (PCB) to provide surface stability. The sensors were used for monitoring growth and degradation of the reference ATCC 15442 Pseudomonas aeruginosa strain biofilm in invitro setting. During the experiment, the impedance spectra of the sensors were measured and analysed using electrical equivalent circuit (EEC) modelling. Additionally, the process of adhesion and growth of bacteria on a sensor’s surface was assessed by means of the optical and SEM microscopy. EEC and SEM microscopic analysis revealed that the gold layer on copper electrodes was not tight, making the PCB sensors susceptible to corrosion while the LTCC sensors had good surface stability. It turned out that the LTCC sensors are suitable for monitoring pseudomonal biofilm and the PCB sensors are good detectors of ongoing stages of biofilm formation.