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Biomedical subjects

M H Santos

Publications and source records attributed to M H Santos.

7 recordsLinked to original sources
PubMed2003

Ameliorating effects of industrial sugar residue on the Jales gold mine spoil (NE Portugal) using Holcus lanatus and Phaseolus vulgaris as indicators.

Phytostabilisation of bare heavily contaminated substrate, such as abandoned mine sites, is considered a very appropriate technology in order to diminish erosion and dispersion of contaminants into the surroundings. In this short-term pot study, application of industrial sugar residue (ISR), a waste product of the sugar industry, proved to ameliorate spoils conditions for plant performance by elevating pH and immobilising several metals. Although arsenate concentrations were positively correlated to spoil pH and spoil treatment with ISR mobilised As, growth of both Phaseolus vulgaris and Holcus lanatus improved significantly after applications of 3.75 g ISR kg(-1) dry spoil. Nutrient uptake from the substrate, with the exception of potassium, was elevated by ISR. As a remediation technique ISR application could be effective although in As-contaminated sites application might be restricted to areas where leaching to (ground) water does not form a risk.

Calcium Carbonate↗
PubMed2001

6-Deoxyjacareubin.

The natural compound 5,10-dihydroxy-2,2-dimethylpyrano[3,2-b]xanthen-6(2H)-one (6-deoxyjacareubin), C(18)H(14)O(5), was isolated from leaves of Vismia latifolia (Guttiferae family). The compound has four six-membered rings. The molecule has two planar benzenoid and one planar pyranoid ring, plus a pyranoid ring in a distorted chair conformation. The crystal is stabilized by one intra- and one intermolecular hydrogen bond.

Crystallography, X-Ray↗
PubMed1998

Amino acid decarboxylase capability of microorganisms isolated in Spanish fermented meat products.

Enterobacteria, lactic acid bacteria (LAB) and Gram-positive cocci were isolated from Spanish meat products. The most frequent species in the meat products studied were identified as Lactobacillus sake, Lactobacillus plantarum and Lactobacillus curvatus from De Man-Rogosa-Sharpe agar; Staphylococcus xylosus, Staphylococcus saprophyticus and Micrococcus varians from mannitol salt phenol-red agar; and Hafnia alvei, Escherichia coli, Pseudomonas fluorescens, Enterobacter amnigenes and Enterobacter aerogenes from violet red bile dextrose agar. The amino acid decarboxylase activity of the microorganisms isolated was assayed. Enterobacteria had higher amino acid decarboxylase activity than the other groups. LAB did not show any significant amino acid decarboxylase capability in this study.

Amino Acids↗
PubMed1982

Amino acid sequence of a 3Fe:3S ferredoxin from the "archaebacterium" Methanosarcina barkeri (DSM 800).

The complete amino acid sequence for a 3Fe:3S ferredoxin from the "archaebacterium" Methanosarcina barkeri (DSM 800) was determined by repetitive Edman degradation on the whole protein and peptides derived from trypsin, thermolysin, and Staphylococcus aureus protease digestion. The protein has 59 residues of which 8 are cysteines. The latter have the same spacing and distribution as found for the clostridial-type 2 x 4Fe:4S ferredoxins. Also, the sequence had evidence of internal homology which is indicative of gene duplication prior to the divergence of the archaebacteria and the eubacteria. This is the first sequence to be reported for a methanogen ferredoxin and only the fourth for a 3Fe:3S ferredoxin from any source.

Amino Acid Sequence↗
PubMed1982

Role of vitamin B12 in methyl transfer for methane biosynthesis by Methanosarcina barkeri.

When Methanosarcina barkeri is grown on methanol as the sole carbon source, a B12-containing protein is synthesized by this organism. This B12 protein contains bound aquocobalamin, and when this cofactor is reduced and methylated with [14C]methyl iodide, the resultant [14C]methyl B12 protein is extremely active in the biosynthesis of 14C-labeled methane. These findings indicate that a B12-dependent system is operative in the biological formation of methane in addition to other systems that are B12-independent.

Bacterial Proteins↗