Temat: oxygen sensors - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Luminescencyjne sensory tlenu, ciśnienia i temperatury
Oxygen, pressure and temperature luminescent sensors
Autorzy:: Tsvirko, M.
Kalota, B.
Powiązania:: https://bibliotekanauki.pl/articles/171947.pdf
Data publikacji:: 2011
Wydawca:: Polskie Towarzystwo Chemiczne
Tematy:: luminescencja
metaloporfiryny
kompleksy europu
sensory tlenu
sensory ciśnienia
sensory temperatury
luminescence
metalloporphyrins
europium complexes
oxygen sensors
pressure sensors
temperature sensors
Opis:: Optical chemical sensors enlarge the definition of a classical chemical sensor; they present results in two-dimensional (2D) or three-dimensional (3D) aspect. They can determine parameters of micro and macro scale objects without using a lot of electronic equipment. This article is focused on sensors based on porphyrin derivatives and europium complexes, being the most frequently used substances sensitive to oxygen concentration, pressure and temperature changes. Along with the presentation of characteristics of substances employed to sensors’ construction, also the general principle of luminescent sensors operation, composition and operation range of selected mono- and bifunctional luminescent sensors are described; moreover the selected achievements, such as the “traffic light” sensor are shown.
Źródło:: Wiadomości Chemiczne; 2011, 65, 11-12; 1069-1097
0043-5104
2300-0295
Pojawia się w:: Wiadomości Chemiczne
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Surface Acoustic Wave Interaction with a Mixture of Oxygen and Nitrogen
Autorzy:: Pasternak, Mateusz
Jasek, Krzysztof
Grabka, Michał
Borowski, Tomasz
Powiązania:: https://bibliotekanauki.pl/articles/176628.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: surface acoustic wave sensors
oxygen detection
leaky Rayleigh waves
Opis:: Parameters of surface acoustic waves (SAW) are very sensible to change of physical conditions of a propagation medium. In the classical theory formulation, the waves are guided along the boundary of semi-infinity solid state and free space. A real situation is more complex and a medium commonly consists of two physical components: a solid substrate and a gaseous or liquid environment. In the case of stress-free substrate, the strongest impact on SAW properties have surface electrical and mechanical conditions determined by solids or liquids adhering to the boundary. This impact is utilised for constructing sensors for different gases and vapours e.g. (Jakubik et al., 2007; Hejczyk et al., 2011; Jasek et al., 2012). The influence of gaseous environment on the SAW properties is usually very weak and ignored. However, in certain condition it can be significant enough to be applied to sensor construction. In general, it concerns Rayleigh wave devices where energy leakage phenomenon is perceptible, especially when the gas being detected considerably changes the density of environment. The paper presents the results of experiments with oxygen-nitrogen mixture. Their primary aim was focused on finding the dependence of resonant frequency and attenuation in SAW resonator on parameters and concentrations of the gas in the environment.
Źródło:: Archives of Acoustics; 2020, 45, 3; 483-486
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The role of hydrogen peroxide in regulation of plant metabolism and cellular signalling in response to environmental stresses
Autorzy:: Ślesak, Ireneusz
Libik, Marta
Karpinska, Barbara
Karpinski, Stanislaw
Miszalski, Zbigniew
Powiązania:: https://bibliotekanauki.pl/articles/1041107.pdf
Data publikacji:: 2007
Wydawca:: Polskie Towarzystwo Biochemiczne
Tematy:: cell wall
cellular redox sensors
transcription factors
photosynthesis
hormone signalling
antioxidants
acclimatory and defence responses
reactive oxygen species (ROS) signalling
cellular metabolism
Opis:: Hydrogen peroxide (H2O2) is produced predominantly in plant cells during photosynthesis and photorespiration, and to a lesser extent, in respiration processes. It is the most stable of the so-called reactive oxygen species (ROS), and therefore plays a crucial role as a signalling molecule in various physiological processes. Intra- and intercellular levels of H2O2 increase during environmental stresses. Hydrogen peroxide interacts with thiol-containing proteins and activates different signalling pathways as well as transcription factors, which in turn regulate gene expression and cell-cycle processes. Genetic systems controlling cellular redox homeostasis and H2O2 signalling are discussed. In addition to photosynthetic and respiratory metabolism, the extracellular matrix (ECM) plays an important role in the generation of H2O2, which regulates plant growth, development, acclimatory and defence responses. During various environmental stresses the highest levels of H2O2 are observed in the leaf veins. Most of our knowledge about H2O2 in plants has been obtained from obligate C3 plants. The potential role of H2O2 in the photosynthetic mode of carbon assimilation, such as C4 metabolism and CAM (Crassulacean acid metabolism) is discussed. We speculate that early in the evolution of oxygenic photosynthesis on Earth, H2O2 could have been involved in the evolution of modern photosystem II.
Źródło:: Acta Biochimica Polonica; 2007, 54, 1; 39-50
0001-527X
Pojawia się w:: Acta Biochimica Polonica
Dostawca treści:: Biblioteka Nauki

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