The peroxidase-NADH biochemical oscillator. 1. Examination of oxygen mass transport, the effect of light, and the role of methylene blue

1995 ◽  
Vol 99 (4) ◽  
pp. 1204-1211 ◽  
Author(s):  
Dean L. Olson ◽  
Alexander Scheeline
Keyword(s):  
Methylene Blue ◽  
Mass Transport ◽  
Biochemical Oscillator ◽  
Effect Of Light

Modulation of endothelial inflammation after Methylene Blue: role of circulating cells

2014 ◽  
Vol 62 (S 01) ◽  
Author(s):  
I. Kanzler ◽  
F. Guo ◽  
N. Bogert ◽  
A. Moritz ◽  
A. Beiras-Fernandez
Keyword(s):  
Methylene Blue ◽  
Circulating Cells ◽  
Endothelial Inflammation

The role of mass transport in laser-induced chemistry

1990 ◽  
Vol 23 (6) ◽  
pp. 188-194 ◽  
Author(s):  
Toivo T. Kodas ◽  
Paul B. Comita
Keyword(s):  
Mass Transport

Methylene blue potentiates vascular reactivity in isolated rat lungs

1989 ◽  
Vol 66 (3) ◽  
pp. 1040-1045 ◽  
Author(s):  
G. M. Mazmanian ◽  
B. Baudet ◽  
C. Brink ◽  
J. Cerrina ◽  
S. Kirkiacharian ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Vascular Reactivity ◽  
Bolus Injection ◽  
Pressor Response ◽  
Hypoxic Response ◽  
Pressor Responses ◽  
Isolated Rat Lung ◽  
Lung Preparation ◽  
Isolated Rat

A bolus injection of methylene blue (1 mg), a guanylate cyclase inhibitor, or aspirin (3 mg) in the isolated rat lung preparation had little or no effect on resting perfusion pressure under normoxic condition. In contrast, methylene blue markedly potentiated hypoxic vasopressor response (4-fold) when injected before or during the alveolar hypoxic stimulation. Hemoglobin also potentiated the hypoxic pressor response. Similarly, methylene blue or aspirin augmented the pressor responses to angiotensin II (0.1–1 microgram). The increased hypoxic response induced by methylene blue was immediate and sustained. Methylene blue, when added during hypoxia in the presence of aspirin, further augmented the response to hypoxia compared with the enhanced hypoxic response observed with aspirin alone. Our results suggest that, in addition to the role of cyclooxygenase products, the pulmonary vascular bed may be regulated by endothelium-dependent factors that can be antagonized directly or indirectly by methylene blue.

scholarly journals Endometrial evaluation with methylene blue staining in patients with normal hysteroscopy

2019 ◽  
Vol 8 (7) ◽  
pp. 2715
Author(s):  
Alka Goel ◽  
Pooja Gupta ◽  
Akansha Singh ◽  
Khushboo Singh
Keyword(s):  
Methylene Blue ◽  
Pregnancy Loss ◽  
Recurrent Pregnancy Loss ◽  
Blue Staining ◽  
False Negatives ◽  
Normal Endometrium ◽  
Significant Difference ◽  
History Of ◽  
Dark Blue

Background: Normally, endometrium comprises of non-absorptive epithelium and does not take up stain. Conventional staining with methylene blue is explained on the basis of existence of apoptotic cells in endometrium.Methods: Of 50 patients of unexplained infertility, AUB, recurrent pregnancy loss were randomly selected and included in the study. Those with abnormal ultrasound and history of tuberculosis were excluded. Conventional hysteroscopy was performed using normal saline as distending medium and in those with grossly normal endometrium were subjected to staining with 5% methylene blue instilled trans cervically. After 5 min, irrespective of the size and pattern, focal dark blue stained areas were considered abnormal and randomly biopsied. Incidence of endometritis in both groups was compared after histopathological examination.Results: Of total 50 patients, histopathological report of only one patient with dark blue staining had evidence of endometritis. Rest had no evidence, of which 73.5% had light blue or unstained areas and 26.5% showed dark blue staining. No statistically significant difference was found between histopathological reports and light or dark blue staining (p=0.28). When percentage stained area was considered more than 50% only to be positive, sensitivity was 100%, specificity 94%, PPV 25% and NPV 100%. False positives were 75% and no false negatives were observed. Although p values improved but still statistically insignificant.Conclusions: Present study failed to establish any significant correlation between staining pattern and detection rate of endometritis. With no Indian studies published on chromohysteroscopy so far, role of methylene blue in detection of subtle endometrial changes in modern gynaecology in Indian subpopulation is yet to be established.

scholarly journals Uptake of Methylene Blue from Aqueous Solution by Pectin–Chitosan Binary Composites

2020 ◽  
Vol 4 (3) ◽  
pp. 95
Author(s):  
Dexu Kong ◽  
Lee D. Wilson
Keyword(s):  
Methylene Blue ◽  
Aqueous Media ◽  
Dye Adsorption ◽  
Adsorption Properties ◽  
Point Of Zero Charge ◽  
Cross Linking ◽  
Gravimetric Analysis ◽  
Adsorption Sites ◽  
Biopolymer Composites

To address the need to develop improved hybrid biopolymer composites, we report on the preparation of composites that contain chitosan and pectin biopolymers with tunable adsorption properties. Binary biopolymer composites were prepared at variable pectin–chitosan composition in a solvent directed synthesis, dimethyl sulfoxide (DMSO) versus water. The materials were characterized using complementary methods (infrared spectroscopy, thermal gravimetric analysis, pH at the point-of-zero charge, and dye-based adsorption isotherms). Pectin and chitosan composites prepared in DMSO yielded a covalent biopolymer framework (CBF), whereas a polyelectrolyte complex (PEC) was formed in water. The materials characterization provided support that cross-linking occurs between amine groups of chitosan and the –COOH groups of pectin. CBF-based composites had a greater uptake of methylene blue (MB) dye over the PEC-based composites. Composites prepared in DMSO were inferred to have secondary adsorption sites for enhanced MB uptake, as evidenced by a monolayer uptake capacity that exceeded the pectin–chitosan PECs by 1.5-fold. This work provides insight on the role of solvent-dependent cross-linking of pectin and chitosan biopolymers. Sonication-assisted reactions in DMSO favor CBFs, while cross-linking in water yields PECs. Herein, composites with tunable structures and variable physicochemical properties are demonstrated by their unique dye adsorption properties in aqueous media.

Sign in / Sign up

Export Citation Format

Share Document