Antioxidant and Prooxidant Role of β-Carotene in Murine Normal and Tumor Thymocytes: Effects of Oxygen Partial Pressure

1997 ◽  
Vol 22 (6) ◽  
pp. 1065-1073 ◽  
Author(s):  
Paola Palozza ◽  
Chiara Luberto ◽  
Gabriella Calviello ◽  
Paola Ricci ◽  
Gianna Maria Bartoli
Keyword(s):  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Β Carotene

Role of oxygen partial pressure and seed layer chemistry in flux mediated epitaxy of single phase multiferroic BiFeO3 thin films

2008 ◽  
Vol 93 (19) ◽  
pp. 192906 ◽  
Author(s):  
Varatharajan Anbusathaiah ◽  
Ching Jung Cheng ◽  
Sung Hwan Lim ◽  
Makoto Murakami ◽  
Lourdes G. Salamanca-Riba ◽  
...  
Keyword(s):  
Thin Films ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Seed Layer ◽  
Single Phase ◽  
Bifeo3 Thin Films ◽  
Multiferroic Bifeo3

Oxidation of 1-butene and butadiene to maleic anhydride. 1. Role of oxygen partial pressure

1983 ◽  
Vol 22 (4) ◽  
pp. 565-570 ◽  
Author(s):  
Fabrizio Cavani ◽  
Gabriele Centi ◽  
Italo Manenti ◽  
Alfredo Riva ◽  
Ferruccio Trifiro
Keyword(s):  
Maleic Anhydride ◽  
Oxygen Partial Pressure ◽  
Partial Pressure

Role of Oxygen Vacancies on the Ferroelectric Properties of Pzt Thin Films

1991 ◽  
Vol 243 ◽  
Author(s):  
Chi Kong Kwok ◽  
Seshu B. Desu
Keyword(s):  
Thin Films ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Vacancy Concentration ◽  
Ferroelectric Properties ◽  
Sol Gel ◽  
Low Oxygen ◽  
Partial Pressures ◽  
Pzt Films

AbstractThe properties of ferroelectric thin films can be significantly influenced by the presence of point defects. The concentration of vacancies presented in these thin films is known to be one of the key parameters causing the degradation of these films when these films are subjected to polarization reversals.To study the effects of the vacancy concentration on the ferroelectric properties, sol gel PZT films and powders were annealed in different oxygen partial pressures. For the PZT films, the reduction of oxides to pure metals was not observed even with films annealed at 2×10−5 atmosphere of oxygen partial pressure. Samples annealed at low oxygen partial pressure (for instance, 10−3 and 2×10−5 atmosphere), which has more Pb and O2 depletions and consequently has more Pb and O2 vacancies, cannot be switched easily. The ratios of coercive field after and before fatigue increase as the defect concentrations of the annealed samples increase.

Role of the oxygen partial pressure on the properties of undoped tin oxide films deposited at low temperature

2008 ◽  
Vol 205 (8) ◽  
pp. 1957-1960
Author(s):  
P. Parreira ◽  
J. Valente ◽  
G. Lavareda ◽  
C. Nunes de Carvalho ◽  
A. R. Ramos ◽  
...  
Keyword(s):  
Low Temperature ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Tin Oxide ◽  
Oxide Films ◽  
Tin Oxide Films

scholarly journals Role of the oxygen partial pressure in the formation of composite Co-CoO nanoparticles by reactive aggregation

2011 ◽  
Vol 13 (10) ◽  
pp. 4583-4590 ◽  
Author(s):  
J. A. De Toro ◽  
J. P. Andrés ◽  
J. A. González ◽  
J. M. Riveiro ◽  
M. Estrader ◽  
...  
Keyword(s):  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Coo Nanoparticles

Oxygen Monitor to Study Vascularization of Medical Devices

MRS Advances ◽  
2020 ◽  
Vol 5 (18-19) ◽  
pp. 991-1000
Author(s):  
Avid Najdahmadi ◽  
Rachel Gurlin ◽  
Mellonie Zhang ◽  
Jonathan RT Lakey ◽  
Elliot Botvinick
Keyword(s):  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Medical Devices ◽  
Optical Probe ◽  
Tissue Response ◽  
Optical Technology ◽  
Subcutaneous Space ◽  
Oxygen Sensitive ◽  
Oxygen Dynamics

Abstract:Prevascularized medical devices can improve cell therapy. Such devices may replace whole organ transplantation with hosting only the necessary therapeutic cells. We have developed a noninvasive optical technology to study the vascularization into such medical devices. In our technique, oxygen partial pressure within a device is monitored by Oxygen Sensitive Tubes (OSTs), comprising oxygen permeable silicone tubing with inner luminal surfaces coated by an oxygen-sensitive porphyrin dye. OSTs were placed within a PDMS device and transplanted into the subcutaneous space of athymic nude mice. An optical probe placed over the skin excites the OSTs with a pulse of light and detects the luminescent lifetime of emitted light, which is uniquely related to oxygen partial pressure. Furthermore, we developed a Dynamic Inhalation Gas Test (DIGT) to determine the oxygen transport rate between the microvasculature and the device. DIGT works by monitoring oxygen partial pressure in a device following a step change in inhaled-gas oxygen content. We report DIGT oxygen dynamics measured intermittently over eight weeks. Our study shows DIGT dynamics are unique to each implant, supporting the important role of the host tissue response in the availability of oxygen over time.

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