Recovery of Iron-Dependent Autotrophic Denitrification Activity from Cell–Iron Mineral Aggregation-Induced Reversible Inhibition by Low-Intensity Ultrasonication

2021 ◽  
Author(s):  
Tian Tian ◽  
Ke Zhou ◽  
Yu-Sheng Li ◽  
Dong-Feng Liu ◽  
Han-Qing Yu
Keyword(s):  
Autotrophic Denitrification ◽  
Reversible Inhibition ◽  
Iron Mineral ◽  
Low Intensity ◽  
Denitrification Activity

Tin Recovery from a Cassiterite-Bearing Magnetite Refractory Ore

2014 ◽  
Vol 543-547 ◽  
pp. 3721-3724
Author(s):  
Xiu Juan Li ◽  
Si Qing Liu ◽  
Yang Zhao ◽  
Ting Ting Li
Keyword(s):  
Magnetic Separation ◽  
Mineral Composition ◽  
Gravity Concentration ◽  
Ore Deposit ◽  
Iron Mineral ◽  
Low Intensity

s. Situated in Honghe Municipality of China, a magnetite-bearing cassiterite ore deposit is characterized by iron and tin minerals association in the oxide ores. Magnetite is the main iron mineral containing fine-sized cassiterite that should be recovered. Except for the complex mineral composition, the valuable minerals are finely disseminated in the ore, a joint process of magnetic and gravity concentration was used to process the ore. Results show that, a tin concentrate and a tin middlings can be obtained in processing the tailings of Low-intensity magnetic separation (LIMS), assaying 31.76% Sn and 1.98% Sn at the recovery of 46.18% and 13.36% respectively. The results provide some valuable reference in utilization of the tailings of the ore.

Alkalinity requirements and the possibility of simultaneous heterotrophic denitrification during sulfur-utilizing autotrophic denitrification

2000 ◽  
Vol 42 (3-4) ◽  
pp. 233-238 ◽  
Author(s):  
E.-W. Kim ◽  
J.-H. Bae
Keyword(s):  
Packed Bed ◽  
Autotrophic Denitrification ◽  
Leachate Treatment ◽  
N2o Production ◽  
Packed Bed Reactors ◽  
N Concentration ◽  
N Removal ◽  
Sulfur Layer ◽  
Denitrification Activity ◽  
Heterotrophic Denitrification

Alkalinity requirement and the possibility of simultaneous heterotrophic denitrification during sulfur-utilizing autotrophic denitrification were evaluated with sulfur packed bed reactors (SPBRs). SPBR showed >99% NO3--N removal efficiency at influent NO3--N concentration of 1,500 mg/L, although 25-40% of the added NO3--N was recovered as N2O. Complete denitrification without N2O production was achieved when the influent NO3--N concentration decreased to 750 mg/L. When nitrified landfill leachate containing 602–687 mg/L of NO3--N was fed to SPBR, denitrification efficiency was greater than 98%. During leachate treatment, alkalinity consumption was 3.25–3.76 g CaCO3/g NO3--N removed. Most of denitrification activity occurred within bottom 11.5 cm of sulfur layer, meaning that effective HRT of 2.34 hours was enough for the complete denitrification at the loading rate of 2.2 kg NO3--N/m3-day. Complete denitrification was also achieved when methanol was added to nitrified leachate without alkalinity addition. In this case, alkalinity produced by heterotrophs was used for sulfur-utilizing denitrification.

Rapid and Reversible Inhibition of Brain Aromatase Activity

2001 ◽  
Vol 13 (1) ◽  
pp. 63-73 ◽  
Author(s):  
J. Balthazart ◽  
M. Baillien ◽  
G. F. Ball
Keyword(s):  
Aromatase Activity ◽  
Reversible Inhibition ◽  
Brain Aromatase

Low-Intensity Cognitive Behavioral Therapy

2017 ◽  
Vol 2 (1) ◽  
pp. 31-36
Author(s):  
Pascal Wabnitz ◽  
Michael Schulz ◽  
Michael Löhr ◽  
André Nienaber
Keyword(s):  
Cognitive Behavioral Therapy ◽  
Behavioral Therapy ◽  
Cognitive Behavioral ◽  
Low Intensity

Maori adaptation of a low intensity mental health intervention in primary care

2012 ◽  
Author(s):  
Fiona Mathieson ◽  
Kara Mihaere ◽  
Sunny Collings ◽  
Anthony Dowell ◽  
James Stanley
Keyword(s):  
Mental Health ◽  
Primary Care ◽  
Health Intervention ◽  
Mental Health Intervention ◽  
Low Intensity

Inhibition rather than Enhancement of Hemostatic System Activation during Initiation of Oral Anticoagulant Treatment

1997 ◽  
Vol 77 (04) ◽  
pp. 685-689 ◽  
Author(s):  
Paul A Kyrle ◽  
Johannes Brockmeier ◽  
Ansgar Weltermann ◽  
Sabine Eichinger ◽  
Wolfgang Speiser ◽  
...  
Keyword(s):  
High Intensity ◽  
Oral Anticoagulant ◽  
Protein C ◽  
Venous Blood ◽  
Rapid Decline ◽  
Oral Anticoagulant Treatment ◽  
Shed Blood ◽  
Low Intensity ◽  
Hemostatic System ◽  
System Activation

SummaryCoumarin-induced skin necrosis is believed to be due to a transient hypercoagulable state resulting from a more rapid decline of the protein C activity relative to that of coagulation factors (F) II, IX and X during initiation of oral anticoagulant therapy. We studied hemostatic system activation during early oral anticoagulant treatment with a technique that investigates coagulation activation in the microcirculation.We determined in 10 healthy volunteers the concentrations of prothrombin fragment F1+2 (f1.2) and thrombin-antithrombin complex (TAT) in blood emerging from an injury of the microvasculature (bleeding time incision) before and after initiation of both high-inten- sity and low-intensity coumarin therapy. In addition, f1.2, TAT, activated F VII (F Vila) and the activities of FII, F VII, F X and protein C were measured in venous blood.A rapid decline of F VII and protein C was observed in venous blood with activities at 24 h of 7 ± 1% and 43 ± 2%, respectively, during the high-intensity regimen. A 20 to 30% reduction of f1.2 and TAT was seen in venous blood at 72 h with no major difference between the high- and the low-intensity regimen. F Vila levels were substantially affected by anticoagulation with a >90% reduction at 48 h during the high-intensity regimen. Following high-intensity coumarin, a >50% decrease in the fl.2 and TAT levels was found in shed blood at 48 h suggesting substantial inhibition of thrombin generation during early oral anticoagulation. An increase in the f1.2 and TAT levels was seen neither in shed blood nor in venous blood.Our data do not support the concept of a transient imbalance between generation and inhibition of thrombin as the underlying pathomechanism of coumarin-induced skin nekrosis.

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