Greenish-blue discoloration of the brain and heart after treatment with methylene blue

2020 ◽  
Author(s):  
Carlos Durão ◽  
Frederico Pedrosa ◽  
Ricardo Jorge Dinis-Oliveira
Keyword(s):  
Methylene Blue ◽  
Blue Discoloration ◽  
Greenish Blue ◽  
The Brain

scholarly journals Charge Density Studies on Anti-Alzheimer Agents

2014 ◽  
Vol 70 (a1) ◽  
pp. C969-C969
Author(s):  
Peter Luger ◽  
Stefan Mebs ◽  
Manuela Weber ◽  
Birger Dittrich
Keyword(s):  
Methylene Blue ◽  
Charge Density ◽  
Tau Protein ◽  
Positive Charge ◽  
Brain Disorders ◽  
Electronic Interactions ◽  
Hirshfeld Surfaces ◽  
Spherical Structures ◽  
The Brain ◽  
Positively Charged

The average age of people is increasing continuously thanks to the progress in the medicinal sciences and further social advances. As a consequence, however, diseases which affect people more likely at a higher age also increase. In this course Alzheimer's disease (AD) and related brain disorders distribute rapidly and have to be taken more serious. One of the most frequently applied drugs against AD is donepezil®. Its function is a reversible inhibition of acetylcholinesterase (AChE), thereby reducing the deficit of acetylcholine associated with the occurrence of AD. As one result from the charge density (CD) of the small-molecule structure containing the donepezilium cation comparable electronic interactions were identified as in the macromolecular TcAChE-donepezil complex which were made visible by electrostatic potential and Hirshfeld surfaces.[1] Two newer developments of Alzheimer agents are bexarotene and methylene blue. For the first one a therapeutic effect on AD in a mouse model was recently reported. From a comparative CD study on bexarotene and its disila analogue differences in the electrostatic potentials were identified, while the spherical structures showed no significant differences. The second one, methylene blue, targets the abnormal tangle type tau protein aggregation inside the nerve cells in the brain and stops its spread. The molecule is positively charged with various counterions. From the CD an answer to the not yet understood question is expected whether the formal positive charge is localized or delocalized.

scholarly journals Enhancement of rat brain tryptophan metabolism by chronic ethanol administration and possible involvement of decreased liver tryptophan pyrrolase activity

1979 ◽  
Vol 178 (3) ◽  
pp. 575-580 ◽  
Author(s):  
A A Badawy ◽  
N F Punjani ◽  
M Evans
Keyword(s):  
Methylene Blue ◽  
Rat Brain ◽  
Chronic Ethanol ◽  
Tryptophan Metabolism ◽  
Ethanol Administration ◽  
Chronic Ethanol Administration ◽  
Tryptophan Pyrrolase ◽  
Tryptophan Concentration ◽  
Phenazine Methosulphate ◽  
The Brain

1. Chronic ethanol administration enhances rat brain 5-hydroxytryptamine synthesis by increasing the availability of circulating tryptophan to the brain. This increased availability is not insulin-mediated or lipolysis-dependent. 2. Under these conditions, tryptophan accumulates in the liver and apo-(tryptophan pyrrolase) activity is completely abolished, but could be restored by administration of regenerators of liver NAD+ and/or NADP+. 3. All four regenerators used (fructose, Methylene Blue, phenazine methosulphate and sodium pyruvate) prevented the ethanol-induced increase in liver tryptophan concentration and the increased availability of tryptophan to the brain. 4. It is suggested that the enhancement of brain tryptophan metabolism by chronic ethanol administration is caused by the decreased hepatic tryptophan pyrrolase activity. The results are briefly discussed in relation to previous work with ethanol. 5. Fructose enhances the conversion of tryptophan into 5-hydroxyindol-3-ylacetic acid in brains of ethanol-treated rats, whereas Methylene Blue inhibits this conversion in both control and ethanol-treated animals.

scholarly journals The Suitability of Methylene Blue Discoloration (MB Method) to Investigate the Fe0/MnO2 System

Processes ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 548
Author(s):  
Viet Cao ◽  
Ghinwa Alyoussef ◽  
Nadège Gatcha-Bandjun ◽  
Willis Gwenzi ◽  
Chicgoua Noubactep
Keyword(s):  
Methylene Blue ◽  
Time Dependent ◽  
Diffusive Transport ◽  
Mass Loading ◽  
Batch Experiments ◽  
Present Communication ◽  
Iron Corrosion ◽  
Typical Time ◽  
Blue Discoloration

The typical time-dependent decrease of the iron corrosion rate is often difficult to consider while designing Fe0-based remediation systems. One of the most promising approaches is the amendment with manganese dioxide (Fe0/MnO2 system). The resulting system is a very complex one where characterization is challenging. The present communication uses methylene blue discoloration (MB method) to characterize the Fe0/MnO2 system. Shaken batch experiments (75 rpm) for 7 days were used. The initial MB concentration was 10 mg L−1 with the following mass loading: [MnO2] = 2.3 g L−1, [sand] = 45 g L−1, and 0 < [Fe0] (g L−1) ≤ 45. The following systems where investigated: Fe0, MnO2, sand, Fe0/MnO2, Fe0/sand, and Fe0/MnO2/sand. Results demonstrated that MB discoloration is influenced by the diffusive transport of MB from the solution to the aggregates at the bottom of the test-tubes. Results confirm the complexity of the Fe0/MnO2/sand system, while establishing that both MnO2 and sand improve the efficiency of Fe0/H2O systems in the long-term. The mechanisms of water decontamination by amending Fe0-based systems with MnO2 is demonstrated by the MB method.

scholarly journals The brain metabolic enhancer methylene blue improves discrimination learning in rats

2007 ◽  
Vol 86 (4) ◽  
pp. 712-717 ◽  
Author(s):  
Kathryn M. Wrubel ◽  
Penny D. Riha ◽  
Monica A. Maldonado ◽  
David McCollum ◽  
F. Gonzalez-Lima
Keyword(s):  
Methylene Blue ◽  
Discrimination Learning ◽  
The Brain

scholarly journals HEME OXYGENASE-2 NEURONS BRAIN AND SPINAL CORD OF HUMAN

2012 ◽  
Vol 67 (6) ◽  
pp. 36-41 ◽  
Author(s):  
V. M. Chertok ◽  
A. E. Kotsyuba ◽  
E. P. Kotsyuba
Keyword(s):  
Spinal Cord ◽  
Central Nervous System ◽  
Methylene Blue ◽  
Nervous System ◽  
Brain Stem ◽  
Heme Oxygenase ◽  
Enzyme Reaction ◽  
Brain And Spinal Cord ◽  
The Brain ◽  
Number Of Cells

Immune localization of heme oxygenase-2 in neurons of some nuclei of the spinal cord and brain stem in 6 men 18–44 years old who died from causes unrelated to injury of central nervous system was studied. Neurons with positive reaction are determined for all studied regions of the brain where their contents in various nuclei ranging from 0,5 to 16% of the total number of cells detected by methylene blue. In all the sensory nuclei there is a high proportion of small neurons with a high or moderate density of reaction produc deposits. Large cells of motor nuclei often exhibit negative or low intensive enzyme reaction. 

Sign in / Sign up

Export Citation Format

Share Document