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Biomedical subjects

I Moura

Publications and source records attributed to I Moura.

151 records · Page 9Linked to original sources
PubMed1978

Isolation and characterization of a rubredoxin and an (8Fe-8S) ferredoxin from Desulfuromonas acetoxidans.

A two cluster (4Fe-4S) ferredoxin and a rubredoxin have been isolated from the sulfur-reducing bacterium Desulfuromonas acetoxidans. Their amino acid compositions are reported and compared to those of other iron-sulfur proteins. The ferredoxin contains 8 cysteine residues, 8 atoms of iron and 8 atoms of labile sulfur per molecule; its minimum molecular weight is 6163. The protein exhibits an abosrbance ratio of A385/A283 = 0.74. Storage results in a bleaching of the chromophore; the denatured ferredoxin is reconstitutable with iron and sulfide. The instability temperature is 52 degrees C. The rubredoxin does not differ markedly from rubredoxins from other anaerobic bacteria.

Amino Acids↗
PubMed1978

A comparative spectroscopic study of two non-haem iron proteins lacking labile sulphide from Desulphovibrio gigas.

The ultraviolet visible, and near infrared spectrum of a two-iron protein from Desulphovibrio gigas, a new type of non-haem iron protein lacking labile sulphide, is compared with that of D. gigas rubredoxin. The charge transfer band maxima of rubredoxin at 495 and 565 nm are less separated in the new protein implying a higher symmetry of the two iron centres. The existence of a spin-spin interaction between the two iron centres in the new protein is suggested by the magnetic susceptibility measurements of the oxidized and reduced states of both proteins, which gives a smaller value per iron centre for the new protein. The oxidized form of the two iron-protein has a complex EPR spectrum with signals at g values of 8.97, 7.72, 5.73, 4.94, and 1.84. An EPR titration gives a value of --35 +/- 15 mV for the two signals at g values of 7.72 and 5.73. Rubredoxin has the characteristic spectrum of rubredoxins with two signals at g values of 9.4 and 4.27.

Bacterial Proteins↗
PubMedDate not supplied

[Evaluation of the indirect immunofluorescence test for the diagnosis of bancroftian filariasis using microfilariae W. bancrofti as the antigen, in Recife-PE, Brazil].

The authors analysed the indirect immunofluorescence assay, for the diagnosis of bancroftian filariasis using papain treated W. bancrofti microfilariae as antigen, widely used in Recife-Brazil. Sera from 50 patients with several clinical forms of the disease including asymptomatic carriers, tropical pulmonary eosinophilia, elephantiasis, filarial fever and chyluria were analysed. For the control group, 50 individuals were selected, living at least 5 years in endemic area, with neither previous DEC treatment nor clinical-laboratory evidences of the disease, called normals endemic. The sensitivity and specificity were analysed taking into account different cut off values. It was not possible to differentiate infected individuals from the control group. It was not even possible to establish any correlation with IMF titers among different clinical presentation of the disease. Crossed reactions with various intestinal helminths were considered, but no relationship was found.

Adolescent↗