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A Angeretti

Publications and source records attributed to A Angeretti.

50 records · Page 3Linked to original sources
PubMedDate not supplied

[Statistical findings on the variability of chemo-antibiotic resistance in minor Salmonella strains particularly frequent in the Piedmont area].

462 Strains of Salmonella spp. were tested; they had been arranged in species according to the frequency of appearance in Regione Piemonte: 358 of them were isolated in the period 1975-'76 and 104 in 1977. The susceptibility of the two groups considered to 40 antibiotics was determined. The results obtained evidenced significant variations of this parameter.

Anti-Bacterial Agents↗
PubMedDate not supplied

[Isolation of Salmonella in the Piedmont from 1975 to 1978, with designation of rare strains and evaluation of the frequency of the serotypes].

In the present study the data concerning the isolation of Salmonella strains in Regione Piemonte during the years 1975-1978 are reported. During this period, using serological methods 2934 Salmonella strains have been typed which resulted to belong to 69 different serotypes. We have also compared the frequency of the different serotypes in the years 1975, 1976, 1977-'78.

Humans↗
PubMedDate not supplied

[Cefamandole: in vitro and in vivo activity].

Among the cephalosporin antibiotics, a relatively new derivative of Cefamandole has been studied, the sodium salt of its formyl ester, Cefamandole nafate. It has shown a broad spectrum of antibiotic activity against a wide variety of Gram-positive and Gram-negative Bacteria (127 strains); the susceptibility was good even with beta-lactamase-producing bacteria. Good protective doses (PD50) were found after mice infections with Staphylococcus aureus and Salmonella wien. The pharmacokinetics of Cefamandole carried out comparatively in 5 human volunteers and in laboratory animals exhibited high levels, especially in the urines.

Animals↗
PubMedDate not supplied

[Fractionation of serum by gel filtration: contamination of IgM fractions by non-specific inhibitors of hemagglutination of the rubella virus].

Rubella virus hemagglutination non-specific inhibitors, in sera fractionated on Bio-Gel A 5 m, elute in IgM containing fractions. In addition, in heparin-MnCl2 treated sera, the same inhibitors display a different chromatographic behaviour on Bio-Gel A 5m, being eluted earlier than IgM. Therefore, in order to avoid false-positive results due to the presence of non-specific inhibitors in IgM containing fractions it is necessary to verify the disappearance of hemagglutination-inhibition activity after 2-ME reduction.

Blood Chemical Analysis↗
PubMedDate not supplied

[Serum fractionation by gel filtration at a high flow rate: use for diagnostic purposes].

High flow rates permit drastic reduction of time required in human serum fractionation by gel filtration giving relatively pure IgM. Fractionation of human serum on Bio-Gel A5m, Superose 6B and Sephacryl S-400, packed in 0.9 X 30 cm columns, at flow rate of 24 cm/h gives IgM fractions employable in diagnosis, in one hour time only.

Acrylic Resins↗
PubMedDate not supplied

[Fosfomycin, lysine-fosfomycin, arginine-fosfomycin: antibacterial activity in vitro].

The antibacterial activity of NaFosfomicin and of two of its aminoacidic derivatives -Lisin-Fosfomycin and Arginin-Fosfomycin- has been determined "in vitro" as MICs and MBCs, on different groups of Bacteria. The results obtained were then statistically analyzed - according to the "t of Student" - in a comparative evaluation of the values between NaFosfomycin-Lisin-Fosfomycin (F-LF); NaFosfomycin-Arginin-Fosfomycin (F-AF); Lisin-Fosfomycin-Arginin-Fosfomycin (LF-AF). From these comparisons, the data found demonstrated no significant differences among the three compounds, for Proteus, Coliforms and Pseudomonas groups, while Salmonella and Staphylococcus Genera showed good differences (P less than 0.05) from the comparison F-AF.

Anti-Bacterial Agents↗
PubMedDate not supplied

[Inhibitory and fatal activity of amoxicillin, erythromycin and josamycin against Streptococci].

23 Streptococcus sp. of different serological groups were assayed to evaluate the susceptibility to amoxycillin, erythromycin and josamycin. Inhibitory (CMI) and bactericidal (CMB) activity were compared to minimal lethal concentration (CML) observed at different times from the beginning of incubation to study the kinetic of lethal effect of the three antibiotics. Erythromycin shows an earlier bactericidal efficacy against most of the strains assayed. CMB and CML evaluated after 18 hours of incubation are generally similar, while CML against Streptococci group G, Streptococci group D assayed with macrolides and CML against alpha-haemolytic Streptococci assayed with amoxycillin are higher.

Amoxicillin↗
PubMedDate not supplied

[Protein p53 inhibits the activity of the enhancer of the immediate-early genes of murine cytomegalovirus].

The protein encoded by the tumor suppressor gene p53 can complex and functionally interact with cytomegalovirus proteins produced during the immediate-early phase of infection. The functions of these complex are unclear but there is some evidence to suggest that binding of p53 to these viral proteins may inactivate p53 functions. Recent reports have shown that p53 is involved in regulation of transcription. In this study we have considered the possibility that p53 may regulate transcription of cytomegalovirus immediate early genes which play a crucial role for virus replication. Here we report that experiments in which NIH 3T3 cells were cotransfected with a p53 expression plasmid together with a reporter gene linked to the mouse cytomegalovirus immediate-early enhancer/promoter revealed that wild type p53 could efficiently reduce the transcriptional activity of this viral regulatory sequence. By contrast expression of a mutated p53 correlated with a much smaller reduction of transcription. Deletion mutants analysis of the enhancer revealed that repression of transcription by p53 requires a minimal promoter containing an SP1 consensus sequence and a TATA box.

3T3 Cells↗
PubMedDate not supplied

[Serum stimulates the transcriptional activity of the enhancer of the immediate-early genes of the murine cytomegalovirus through p21 ras].

The analysis of the MCMV IE enhancer revealed the presence of many putative binding sites for the transcription factors AP-1 and NFkB. Previous studies suggested that such factors represent a final target for the metabolic cascade triggered by serum and growth factors. On these basis we wanted to verify if serum stimulates the transcriptional activity of the MCMV IE enhancer through p21ras and AP-1 and NFkB according to the actual model of transduction of the mitogenic signal. Our data demonstrate that serum stimulates the MCMV IE enhancer through a pathway in which the p21ras is involded, as demonstrated by using the dominant inhibitory mutant ras(Asn 17). Moreover deletion mutant analysis of the enhancer showed that the serum responsive region lies between nucleotides -1280 and -285 and contains a high concentration of putative AP-1 and NFkB binding sites.

3T3 Cells↗
PubMedDate not supplied

Constitutive expression of the interferon-inducible protein p202 in NIH 3T3 cells affects cell cycle progression.

p202 is a protein expressed in murine cells after Interferon treatment. Although the function of p202 is still basically unknown, its ability to bind the hypophosphorylated form of the retinoblastoma protein pRb suggests a possible role in the control of cell proliferation. To investigate the role of p202 we have generated several cell clones of NIH 3T3 fibroblasts that constitutively express p202. Here we show that proliferation of quiescent cells on stimulation by serum addition is strongly inhibited by constitutive p202 expression. Moreover, when growth arrested cells are stimulated to proliferate, expression of p202 inhibits G0/G1 progression into the S phase and the cells accumulate with a DNA content that is equivalent to cells arrested in the G0/G1 phase of the cell cycle. Taken together, these studies suggest that p202 may play a negative role in growth regulation.

3T3 Cells↗