Search Results - (Author, Cooperation:M. Fidalgo)

2013-02-12

Nature Publishing Group (NPG)

0028-0836

1476-4687

Biology

Chemistry and Pharmacology

Medicine

Natural Sciences in General

Physics

Animals ; Cellular Reprogramming/*physiology ; DNA-Binding Proteins/genetics/*metabolism ; Embryonic Stem Cells ; Gene Expression Regulation, Developmental ; Genome ; Homeodomain Proteins/genetics/*metabolism ; Mice ; Protein Binding ; Proto-Oncogene Proteins/genetics/*metabolism

1572-901X

Springer Online Journal Archives 1860-2000

Chemistry and Pharmacology

Abstract α-Diimines, RN:C(R′)C(R′):NR′′(LL) derived from glyoxal, GLL (R′=H) abbreviated as GAA (R= R′′=4-dimethylaminophenyl) or GHA (R= R′′=4-hydroxyphenyl), and derived from biacetyl, BLL (R′=Me) abbreviated as BDH (R=R′′= NH2), BOH (R=NH2, R′′=OH) react with carbonylrhodium(I) compounds to give different products depending on the imino substituents in the ligand and/or the solvent employed. The reaction of α-diimines bearing amino groups, such as GAA or BDH with [RhCl(CO)2]2 in acetone yields binuclear [RhCl(CO)2]2(μ-LL) while in CH2Cl2 ionic [Rh- (CO)2(LL)]+[RhCl2(CO)2]− species are obtained. In acetone [RhCl(CO)2]2(μ-GAA) exists as an equilibrium mixture between two different neutral binuclear species; [Rh(CO)2(BDH)]+ exists as a mixture of two species containing chelate or monodentate bonded diimine respectively. GAA or BDH react “in situ” with [RhCl(CO)(C2H4)]2 in benzene to yield tetracoordinated monocarbonylated [RhCl(CO)(LL)] compounds. α-Diimines (LL) bearing hydroxy groups, such as GHA or BOH react with [RhCl(CO)2]2 or “[RhCl(CO)(C2H4)]2” to give pentacoordinated dicarbonylated [RhCl(CO)2(LL)] compounds.

Electronic Resource

1572-9699

diffusion chambers ; fecal indicators ; recreational waters ; Salmonella serotypes ; Salmonella survival ; water pollution

Springer Online Journal Archives 1860-2000

Biology

Abstract The presence of Salmonella and its relationship with indicator organisms of fecal pollution, such as total coliforms, fecal coliforms and fecal streptococci, was studied at two marine zones in Portugal. Seventeen different Salmonella serotypes were isolated and identified, S. virchow was the most frequently isolated (21.6%). In addition, a high percentage (35.1%) was recorded for some Salmonella serotypes of clinical significance, namely S. enteritidis, S. infantis, S. typhimurium and S. virchow. In any of the samples from the two zones Salmonella was not detected in the absence of any of the indicator organisms. However, the incidence of Salmonella as a function of indicator concentration intervals established by the EEC standards was 0, 10 and 19.3% at guide values of total coliforms, fecal coliforms and fecal streptococci, respectively in the Faro samples (south of Portugal). In contrast, Salmonella incidence rates of 37.5, 36.4 and 33.3% were recorded at the corresponding guide values the Caminha samples (north of Portugal). No significant correlations (p〉0.005) were obtained between Salmonella and the indicators at the sampling stations; however, total coliforms and fecal streptococci were the indicators most closely related to Salmonella in Caminha and Faro samples, respectively. Survival experiments in Escherichia coli, Enterococcus faecalis and S. typhimurium, using diffusion chambers, were performed to verify whether the lack of correlation between indicators and Salmonella was due to different inactivation rates in seawater. The results indicate that survival percentages of the three microorganisms tested were similar after 48 h of exposure to seawater.

Electronic Resource