Prokaryotic communities of acidic peatlands from the southern Brazilian Atlantic Forest

The acidic peatlands of southern Brazil are ecosystems essential for the maintenance of the Atlantic Forest, one of the 25 hot-spots of biodiversity in the world. In this work, we investigated the composition of prokaryotic communities in four histosols of three acidic peatland regions by constructing small-subunit (SSU) rRNA gene libraries and sequencing. SSU rRNA gene sequence analysis showed the prevalence of Acidobacteria (38.8%) and Proteobacteria (27.4%) of the Bacteria domain and Miscellaneous (58%) and Terrestrial (24%) groups of Crenarchaeota of the Archaea domain. As observed in other ecosystems, archaeal communities showed lower richness than bacterial communities. We also found a limited number of Euryarchaeota and of known methanotrophic bacteria in the clone libraries.

Effects of the pollution by petroleum on the tracheids along the stem of Podocarpus lambertii Klotzsch ex Endl., Podocarpaceae

Podocarpus lambertii Klotzsch ex Endl. (Podocarpaceae) is native and a member of the Pinophyta (Gymnosperm) of southern Brazil, locally known as "pinheiro-bravo". The present work aims to investigate the effects of petroleum on the tracheids dimensions. Wood samples from twenty individuals were studied along the stem, ten being exposed to pollution and ten used as a control set. The wood samples were collected from incisions at three levels: at the ground level, and one and two metres above the ground level. From these samples, sub-samples were selected at the border of the growth layers in the vascular cambium-medulla direction. The methodology followed that traditionally recommended for plant anatomy studies, with analyses done by light microscopy (OLYMPUS - BX41) assisted by the software Image Pro-plus for measurements. Comparison of the individuals exposed to petroleum with the control set, showed that the length, diameter and cell wall width of the tracheids of the former were smaller, a trend which was statistically significant according to the Student's t-test. These traits were observed mainly on the tracheids of the last growth layer, corresponding to the year in which the individuals were exposed to petroleum.

[Post-traumatic stress: the mechanisms of trauma]

Since the first description of stress syndrome, by Hans Selye in 1936, much has been investigated concerning the etiological mechanisms of stress. In recent years the intense research in the field of the neurobiology of stress, namely in Post-Traumatic Stress Disorder (PTSD), revealed some of the mechanisms and neurological structures involved with stress. A systematic research of literature published until December of 2006 was made, through the MEDLINE using as keywords neurobiology, stress, post traumatic stress disorder, neuroendocrine, neurochemical, neuroimmunological, neuroimaging. Of a total of 70 found articles, 39 were selected by its adequacy and acquired for the accomplishment of this revision. Also, reference books were consulted for the areas of theoretical concepts of stress and phenomenology of trauma. The authors intend to review the way cerebral structures, multiple neuronal and hormonal ways form a complex mechanism of reaction to stress. It is intended with this article to demonstrate the relation between psychopathological events, namely in PTSD, the phenomenology of the trauma and neurobiological changes.

Demographic of short gut syndrome: increasing demand is not followed by referral of potential candidates for small bowel transplantation

BACKGROUND

Despite improvements in small bowel transplantation (SBTx), early referral of patients with irreversible intestinal failure (IF) remains a major obstacle. In this study we evaluated the demand for SBTx among seven surgical pediatric centers located at least 200 km from our center.

METHODS

From 1997 to 2001, 640 patients have been treated for neonatal diseases, including 248 who underwent a minor or major intestinal resection. Twenty-four patients with major resections presented with short gut syndrome, requiring total parenteral nutrition (TPN). The greatest demand was in postsurgical neonates with necrotizing enterocolitis, gastroschiesis, onphalocoeles, or midgut volvulus, and in three adults with postradiotherapy arteritis (n = 2) and mesenteric vein thromboses (n = 1). The median length of residual bowel after resection was 20 to 30 cm, without an ileocecal valve. Four patients were referred for SBTx evaluation; three died while awaiting a donor; 20 were not referred, among whom 14 died of TPN complications.

RESULTS

Approximately 62 children per year require nutritional support for IF, most of whom develop complications related to TPN. Because many patients who are TPN-dependent develop complications, we believe that early referral would reduce mortality.

CONCLUSIONS

Greater medical awareness about the feasibility of SBTx procedures and earlier referral may improve results and quality of life after transplant.

Teleconsultation for cooperative acquisition, analysis and reporting of ultrasound studies

We have developed a teleconsultation system to support cooperation between doctors at different institutions in the acquisition, analysis and reporting of ultrasound studies. All the relevant activities were supported by the application. The system enabled remote supervision of the ultrasound study as it was being performed, cooperative static image acquisition and analysis, as well as report writing. Cooperative analysis of previously acquired studies was also possible. The system is undergoing evaluation in five hospitals in Portugal.