Relationships Between Bactericidal Effect and Inhibition of Ribonucleic Acid Nucleotidyl-transferase by Rifampicin in Escherichia coli K-12

The mechanism of action of rifampicin, an antibiotic which inhibits in vitro the polycondensation of ribonucleotides by ribonucleic acid (RNA) nucleotidyltransferase, was studied in vivo in Escherichia coli. It is argued that the inhibition of RNA nucleotidyltransferase represents the primary lesion and is responsible for the bactericidal effect. This conclusion is based on (i) the correlation between concentrations of the antibiotic which block in vivo incorporation of labeled uracil and the bactericidal concentrations, (ii) the evidence that the loss of viability of the cells immediately follows the block of RNA synthesis, and (iii) the observation that the reversal of the inhibition of RNA synthesis goes together with a reversal of the loss of viability.     

Mental and Physical Health and Spiritual Healing: An Evaluation of Complementary Religious Therapies Provided by Spiritist Centers in the City of São Paulo,Brazil

The present study aims to describe the characteristics of the complementary religious treatment conducted by Spiritist centers in the city of São Paulo (Brazil), to understand how physical and mental health problems are addressed and how the directors of these centers differentiate between persons with spiritual experiences from those with psychiatric disorders. From 365 Spiritist centers, which received the questionnaire, 55 (15.1 %) were included in the final analysis. There were on average 261 people per week attending spiritual sessions in each center, totalizing approximately 15,000 attendees per week in all 55 centers. The most common treatment performed in these centers was disobsession (Spirit release therapy) (92.7 %); the least common was the ‘spiritual surgery’, present in only 5.5 %. The most frequent health problems reported by attendees were depression (45.1 %), cancer (43.1 %) and diseases in general (33.3 %). Concerning the directors’ awareness to differentiate between spiritual experiences and psychiatric disorders, we found some remarkable divergent opinions. In conclusion, the Spiritist centers are an important health related support system for the city of São Paulo, responsible for a significant share of the city’s total health consultations. The most common conditions the patients suffer from were depression and cancer.     

New Synthetic Tools for Peptide-Tetraphenylporphyrin Derivatives

New metal-tetraphenylporphyrins and Fmoc-lysine-metalloporphyrin derivatives have been used to prepare peptide-porphyrin and peptide-metalloporphyrin compounds via solid-phase peptide synthesis. A water-soluble peptide, covalently bound to a manganese(III)-porphyrin, has been used as a catalyst to promote the oxidation of ABTS by hydrogen peroxide or t-butylhydroperoxide.     

Effect of black widow spider venom on the cockroach heart

The effect of black widow spider venom [crude gland extract (CGE), gland lumen venom (GLV), or from direct bite] on the cardiac activity of Periplaneta americana was assayed both in vivo and in vitro. It was shown that these different forms of venom in all cases blocked the cockroach heart-beat. Both CGE and GLV showed a selective activity on the heart function compared with their effect on the CNS. It is suggested that cardiac block is due to impairment of either the cardiac nerve ganglia function or the myocardial neuromuscular junctions, or of both of them. The mode of action of the toxic effects on the heart is discussed. Experiments with antiserum from CGE indicate that the antigenic fractions of CGE and GLV affecting the heart function, as well as those affecting the insect motor functions, are common to both toxic materials.     

Use of anti HHV-6 transfer factor for the treatment of two patients with chronic fatigue syndrome (CFS). Two case reports

Specific Human Herpes virus-6 (HHV-6) transfer factor (TF) preparation, administered to two chronic fatigue syndrome patients, inhibited the HHV-6 infection. Prior to treatment, both patients exhibited an activated HHV-6 infection. TF treatment significantly improved the clinical manifestations of CFS in one patient who resumed normal duties within weeks, whereas no clinical improvement was observed in the second patient. It is concluded that HHV-6 specific TF may be of significant value in controlling HHV-6 infection and related illnesses.     

Blood Lipids in Antarctic and in Temperate-Water Fish Species

Antarctic fish live in very cold water and have adapted to this exceptional environment. Hemoglobin is absent or very low; yet these fish still have erythrocytes, and from these we prepared ghost-like membranes. We studied for the first time the lipid composition of ghost membranes and of plasma in Antarctic fish (C. hamatus and T. bernacchii) and compared our results with those obtained for temperate-water fish (C. auratus and A. anguilla taken from Lake Trasimeno, Perugia, Italy). The membranes of Antarctic fish were richer in glycerophospholipid (especially phosphatidylethanolamine), whereas the membranes of temperate-water fish were richer in sphingomyelin. Unsaturated fatty acids were particularly abundant in Antarctic fish: C. hamatus had long-chain unsaturated fatty acid (especially C22:6 ω-3), whereas T. bernacchii had shorter unsaturated fatty acyl chains (c16:1, ω-7). On the other hand, C. auratus and A. anguilla were particularly rich in C16:0, which constituted more than one-half of the total fatty acid. Plasma lipids (both phospholipid and cholesterol) were much more abundant in temperate-water fish. The differences in phospholipid content were mainly due to choline glycerolipids. Measures of membrane fluidity inferred from the fluorescence anisotropy of DPH indicated that the membranes from Antarctic fish were more fluid at any measured temperature than those obtained from fish living in temperate waters. The ability to live in a very cold environment has therefore been achieved by the two Antarctic species tested in this paper by different strategies, but with the same results on fluidity.     

Effects of polyamines on higher-order folding of in situ chromatin

Modifications of the higher-order chromatin structure induced by polyamines have been quantitatively investigated in situ through a non-invasive biophysical approach using Differential Scanning Calorimetry and Quantitative Fluorescence Microscopy. Calorimetric and intensitometric profiles have been acquired for samples of native thymocytes, alternatively suspended in buffers, with or without natural polyamines (spermine and spermidine). The results here reported show that the structure and distribution of nuclear chromatin in situ considerably change upon the ionic composition of the environment. A quantitative analysis of this data and a comparison with previous results obtained from isolated chromatin fibers was carried out. Finally, an inverse relationship between chromatin condensation and nuclear volume was observed.