scholarly journals Interaction of Normal and Sickle Hemoglobins for Sodium Dodecylsulphate and Hydrogen Peroxide at pH 5.0 and 7.2

2013 ◽  
Vol 2013 ◽  
pp. 1-5
Author(s):  
Fortunatus C. Ezebuo ◽  
Sabinus Oscar O. Eze ◽  
Colin B. Lukong ◽  
Ferdinand C. Chilaka
Keyword(s):  
Hydrogen Peroxide ◽  
Hydroxyl Radicals ◽  
Malaria Parasite ◽  
Significant Proportion ◽  
Clinical Manifestations ◽  
Metabolic Process ◽  
Binding Parameters ◽  
Digestive Vacuole ◽  
Sodium Dodecylsulphate ◽  
Intraerythrocytic Stage

Clinical manifestations of malaria primarily result from proliferation of the parasite within the hosts’ erythrocytes. The malaria parasite digests hemoglobin within its digestive vacuole through a sequential metabolic process involving multiple proteases. The activities of these proteases could lead to the production of ROS which could lead to the death of the parasites due to the destruction of their membrane. The action of SDS on hemoglobins can be likened to the way malarial proteases destabilizes host hemoglobin. Hence, the study was designed to determine the binding parameters of SDS and H2O2 for normal, sickle trait carrier and sickle hemoglobins at pH 5.0 and 7.2 using UV-VIS Titration Spectrophotometry. Hb-SDS interactions were significantly different at pH 5.0 but were not at pH 7.2. Also, Hb-H2O2 interactions were statistically different at pH 5.0 and 7.2. The interactions suggest that HbA and HbS are easily destabilized than HbAS and that HbAS has more affinity for H2O2. These suggest a production of more ferryl intermediates or hydroxyl radicals. All these interactions may hinder the development of the malaria parasite at the intraerythrocytic stage and could likely account for a significant proportion of the mechanism that favours the resistance to malaria by individuals with HbAS.

scholarly journals 2021 Update on the Clinical Management and Diagnosis of Kawasaki Disease

2021 ◽  
Vol 23 (3) ◽  
Author(s):  
Frank Zhu ◽  
Jocelyn Y. Ang
Keyword(s):  
High Risk ◽  
Kawasaki Disease ◽  
Corticosteroid Therapy ◽  
Clinical Management ◽  
Treatment Guidelines ◽  
Day Treatment ◽  
Significant Proportion ◽  
Clinical Manifestations ◽  
Heart Association ◽  
Ivig Resistance

Abstract Purpose of Review Provide an updated review of the clinical management and diagnosis of Kawasaki disease with inclusion of potential diagnostic difficulties with multisystem inflammatory syndrome in children (MIS-C) given the ongoing COVID-19 pandemic. Recent Findings Adjunctive corticosteroid therapy has been shown to reduce the rate of coronary artery dilation in children at high risk for IVIG resistance in multiple Japanese clinical studies (most notably RAISE study group). Additional adjunctive therapies (etanercept, infliximab, cyclosporin) may also provide limited benefit, but data is limited to single studies and subgroups of patients with cardiac abnormalities. The efficacy of other agents (atorvastatin, doxycycline) is currently being investigated. MIS-C is a clinically distinct entity from KD with broad clinical manifestations and multiorgan involvement (cardiac, GI, hematologic, dermatologic, respiratory, renal). MIS-C with Kawasaki manifestations is more commonly seen in children < 5 years of age. Summary The 2017 American Heart Association (AHA) treatment guidelines have included changes in aspirin dosing (including both 80–100 mg/kg/day and 30–50 mg/kg/day treatment options), consideration of the use of adjuvant corticosteroid therapy in patients at high risk of IVIG resistance, and the change in steroid regimen for refractory KD to include both pulse-dose IVMP and longer course of prednisolone with an oral taper. A significant proportion of children diagnosed with MIS-C, a post-infectious syndrome of SARS-CoV-2 infection, meet criteria for Kawasaki disease. Further investigation is warranted to further delineate these conditions and optimize treatment of these conditions given the ongoing COVID-19 pandemic.

Removal of Proteinaceous Soils Using Hydroxyl Radicals Generated by the Electrolysis of Hydrogen Peroxide

2002 ◽  
Vol 250 (2) ◽  
pp. 409-414 ◽  
Author(s):  
Koreyoshi Imamura ◽  
Yoichiro Tada ◽  
Hirohumi Tanaka ◽  
Takaharu Sakiyama ◽  
Kazuhiro Nakanishi
Keyword(s):  
Hydrogen Peroxide ◽  
Hydroxyl Radicals

scholarly journals Killing of Bacillus Spores by Aqueous Dissolved Oxygen, Ascorbic Acid, and Copper Ions

2003 ◽  
Vol 69 (4) ◽  
pp. 2245-2252 ◽  
Author(s):  
J. B. Cross ◽  
R. P. Currier ◽  
D. J. Torraco ◽  
L. A. Vanderberg ◽  
G. L. Wagner ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Ascorbic Acid ◽  
Dissolved Oxygen ◽  
Hydroxyl Radicals ◽  
Fenton Reaction ◽  
Copper Ions ◽  
Transition Metal Ions ◽  
Fenton Reagent ◽  
Bacillus Spores ◽  
Modified Fenton

ABSTRACT An approach to decontamination of biological endospores is discussed. Specifically, the performance of an aqueous modified Fenton reagent is examined. A modified Fenton reagent formulation of cupric chloride, ascorbic acid, and sodium chloride is shown to be an effective sporicide under aerobic conditions. The traditional Fenton reaction involves the conversion of hydrogen peroxide to hydroxyl radical by aqueous ionic catalysts such as the transition metal ions. Our modified Fenton reaction involves the conversion of aqueous dissolved oxygen to hydrogen peroxide by an ionic catalyst (Cu2+) and then subsequent conversion to hydroxyl radicals. Results are given for the modified Fenton reagent deactivating spores of Bacillus globigii. A biocidal mechanism is proposed that is consistent with our experimental results and independently derived information found in the literature. This mechanism requires diffusion of relatively benign species into the interior of the spore, where dissolved O2 is then converted through a series of reactions which ultimately produce hydroxyl radicals that perform the killing action.

scholarly journals Photochemical Degradation of Sulfadiazine

2013 ◽  
Vol 39 (3) ◽  
pp. 79-91 ◽  
Author(s):  
Natalia Lemańska-Malinowska ◽  
Ewa Felis ◽  
Joanna Surmacz-Górska
Keyword(s):  
Hydrogen Peroxide ◽  
Uv Radiation ◽  
Hydroxyl Radicals ◽  
Rate Constant ◽  
Photochemical Degradation ◽  
Photochemical Processes

Abstract The photochemical degradation of the sulfadiazine (SDZ) was studied. The photochemical processes used in degradation of SDZ were UV and UV/H2O2. In the experiments hydrogen peroxide was applied at different concentrations: 10 mg/dm3 (2.94*10-4 M), 100 mg/dm3 (2.94*10-3 M), 1 g/dm3 (2.94*10-2 M) and 10 g/dm3 (2.94*10-1 M). The concentrations of SDZ during the experiment were controlled by means of HPLC. The best results of sulfadiazine degradation, the 100% removal of the compound, were achieved by photolysis using UV radiation in the presence of 100 mg H2O2/dm3 (2.94*10-3 M). The determined rate constant of sulfadiazine reaction with hydroxyl radicals kOH was equal 1.98*109 M-1s-1.

scholarly journals Proteinuria and malaria parasite counts in children

2013 ◽  
Vol 53 (6) ◽  
pp. 295 ◽  
Author(s):  
Mahrani Lubis ◽  
Rusdidjas Rusdidjas ◽  
Rafita Ramayati ◽  
Oke Rina Ramayani ◽  
Rosmayanti S Siregar ◽  
...  
Keyword(s):  
Malaria Parasite ◽  
Clinical Manifestations ◽  
Cross Sectional Study ◽  
Sectional Study ◽  
Cross Sectional ◽  
Urine Dipstick ◽  
Weak Association ◽  
Blood Smears ◽  
Moderate Malnutrition ◽  
Peripheral Blood Smears

Background Malaria-induced proteinuria has been observed insevere cases of malaria. Few studies have been done to assess foran association between proteinuria and malaria parasite countsbefore the disease becomes severe.Objective To investigate a possible association between proteinuriaand malaria parasite counts in children .Methods A cross-sectional study was conducted on school-agedchildren in Panyabungan, Mandailing Natal, between Septemberto November 2010. Malaria was diagnosed by microscopicexamination of peripheral blood smears. Children with malariaunderwent proteinuria t ests by urine dipstick method. Anassociation between proteinuria and malaria parasite counts wasanalyzed using linear regression test.Results Of 181 participants with Plasmodium fak:iparum malaria,53.6% were female and had a mean age of 7.8 years. Subjects'nutritional status were as follows: 50.8% normoweight, 28.2%mild malnutrition, 3 .3% moderate malnutrition, and 17. 7% severemalnutrition. Clinical manifestations showed 36.5% suffered fromsubfebrile temperatures and 29.8% had pallor. Proteinuria occurredin 45.9% participants and there was a weak association betweenproteinuria and malaria parasite counts (raa .261, Paa .0001).Conclusion There is a weak association between proteinuria andmalaria parasite counts in children.

Bactericidal effect of hydroxyl radicals generated by the sonolysis and photolysis of hydrogen peroxide for endodontic applications

2017 ◽  
Vol 103 ◽  
pp. 65-70 ◽  
Author(s):  
Haruna Ibi ◽  
Makoto Hayashi ◽  
Fumihiko Yoshino ◽  
Muneaki Tamura ◽  
Ayaka Yoshida ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Hydroxyl Radicals ◽  
Bactericidal Effect
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