scholarly journals Sensitivity to Oxygen of Nitrogenase Activity in Rhizobium Strain ANU289 of the Non-legume Parasponia (Ulmaceae)

1984 ◽  
Vol 37 (2) ◽  
pp. 31 ◽  
Author(s):  
S S Mohapatra ◽  
PM GresshoffA
Keyword(s):  
Carbon Source ◽  
Gas Phase ◽  
Cell Density ◽  
Oxygen Concentration ◽  
Oxygen Tension ◽  
Nitrogenase Activity ◽  
Rhizobium Strain ◽  
Low Oxygen ◽  
Liquid Cultures ◽  
Low Oxygen Tension

Nitrogenase activity can be detected in Rhizobium strain ANU289 of Parasponia in shaken liquid cultures. A combination of consistently low oxygen tension and appropriate cell density was found to be essential for rapid initiation and high specific rates (in the range of 50-60 nmoles of ethylene per milligram protein per hour). In the presence of succinate as carbon source and an oxygen concentration of 0�25% (v/v) in the gas phase, nitrogenase activity developed after incubation for 24 h. The requirement for an oxygen concentration in the range of O� 1 to 0�35% for derepression indicated a lack of any inherent tolerance to higher oxygen levels and thus suggests that plant-derived mechanisms are responsible for protection by oxygen in the nodule.

A brief very-low oxygen tension regimen is sufficient for the early chondrogenic commitment of human adipose-derived mesenchymal stem cells

2021 ◽  
Vol 66 (1) ◽  
pp. 98-104 ◽  
Author(s):  
Marco Govoni ◽  
Claudio Muscari ◽  
Francesca Bonafè ◽  
Paolo Giovanni Morselli ◽  
Marilisa Cortesi ◽  
...  
Keyword(s):  
Stem Cells ◽  
Mesenchymal Stem Cells ◽  
Oxygen Tension ◽  
Low Oxygen ◽  
Low Oxygen Tension

Glucosamine sulphate does not increase extracellular matrix production at low oxygen tension

2009 ◽  
Vol 337 (1) ◽  
pp. 103-111 ◽  
Author(s):  
Cheng-Juan Qu ◽  
Teemu Pöytäkangas ◽  
Marjo Jauhiainen ◽  
Seppo Auriola ◽  
Mikko J. Lammi
Keyword(s):  
Extracellular Matrix ◽  
Oxygen Tension ◽  
Low Oxygen ◽  
Low Oxygen Tension ◽  
Extracellular Matrix Production ◽  
Glucosamine Sulphate ◽  
Matrix Production

Oxygen concentration in milk of healthy and mastitic cows and implications of low oxygen tension for the killing ofStaphylococcus aureusby bovine neutrophils

1988 ◽  
Vol 55 (4) ◽  
pp. 513-519 ◽  
Author(s):  
Susan J. Mayer ◽  
Avril E. Waterman ◽  
Peter M. Keen ◽  
Neil Craven ◽  
F. John Bourne
Keyword(s):  
Staphylococcus Aureus ◽  
Mammary Gland ◽  
Partial Pressure ◽  
Oxygen Concentration ◽  
Bactericidal Activity ◽  
Mammary Glands ◽  
Low Oxygen ◽  
Low Oxygen Tension ◽  
Bovine Neutrophils ◽  
Venous Plasma

SummaryThe partial pressure of O2in milk from normal cows and from cows with mastitis was measured and the concentrations of O2calculated. Oxygen levels of milk from normal cows were similar to those in venous plasma, but inflammation of the mammary gland led to a dramatic drop in O2concentration to < 10% of control values. Intracellular survival ofStaphylococcus aureusstrain M60 in bovine neutrophils was greater under anaerobic than aerobic conditions. The implications of low O2concentrations in milk from infected mammary glands for the bactericidal activity of bovine neutrophils is discussed.

Acclimatization to Low Oxygen Tension

1953 ◽  
Vol 33 (1) ◽  
pp. 13-34 ◽  
Author(s):  
J. Clifford Stickney ◽  
Edward J. Van Liere
Keyword(s):  
Oxygen Tension ◽  
Low Oxygen ◽  
Low Oxygen Tension

scholarly journals Inhibition of Rho Kinase by Y27632 Increases Low Oxygen Tension‐Induced ATP Release from Human Red Blood Cells (RBCs)

2010 ◽  
Vol 24 (S1) ◽  
Author(s):  
Kelly Thuet ◽  
Elizabeth Bowles ◽  
Meera Sridharan ◽  
Shaquria Adderley ◽  
Randy Sprague ◽  
...  
Keyword(s):  
Red Blood Cells ◽  
Oxygen Tension ◽  
Blood Cells ◽  
Atp Release ◽  
Rho Kinase ◽  
Low Oxygen ◽  
Human Red Blood Cells ◽  
Low Oxygen Tension

Effect of Oxygen on Growth of Mycobacterium ulcerans in the BACTEC System

1998 ◽  
Vol 36 (11) ◽  
pp. 3420-3422 ◽  
Author(s):  
J. C. Palomino ◽  
A. M. Obiang ◽  
L. Realini ◽  
W. M. Meyers ◽  
F. Portaels
Keyword(s):  
Primary Culture ◽  
Oxygen Concentration ◽  
Oxygen Tension ◽  
Mycobacterium Ulcerans ◽  
Clinical Samples ◽  
Low Oxygen ◽  
Bactec System ◽  
Effect Of Oxygen ◽  
Low Oxygen Concentration

The effect of low oxygen concentration on the growth of 15 strains of Mycobacterium ulcerans was evaluated in the BACTEC system. Reduced oxygen tension enhanced the growth of M. ulcerans, suggesting that this organism has a preference for microaerobic environments. Application of this observation may improve rates of isolation of M. ulcerans in primary culture from clinical samples and promote isolation of the bacterium from environmental sources.

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