Metagenomic Investigation of Bacterial and Archaeal Diversity of Hammam Essalihine Hot Spring from Khenchela, Algeria
GEOMICROBIOLOGY JOURNAL
Authors: Adjeroud, Moussa; Escuder-Rodriguez, Juan-Jose; Gonzalez-Siso, Maria-Isabel; Kecha, Mouloud
Abstract
Hot springs are natural environments where hot groundwater comes out from the earth. Exploring the microbial diversity present in hot springs is important first to determine the microorganisms able to proliferate there and to understand their role in biogeochemical cycles. In Algeria, research concerning microbial populations in those ecosystems is limited. This study describes bacterial and archaeal diversity of the 'Hammam Essalihine' hot spring in Khenchela province in north-east Algeria using a culture-independent approach. This is the first microbial diversity investigation in the 'Hammam Essalihine' hot spring using next-generation sequencing techniques to assess the species classification of thermophilic microorganisms. Genomic DNA was extracted from water samples and the V4-V5 region of 16SrRNAgene were amplified, sequenced, and analyzed. The average temperature of water varies from 68 to 70 degrees C. High-throughput sequencing analysis revealed the presence of 21 bacterial phyla, including an unknown phylum and distributed across 42 families and 39 genera. The majority of the sequences were observed to belong to the kingdom Bacteria. The bacterial community from this hot spring is dominated byProteobacteria(41.52%),Chloroflexi(7.62%), andBacteroidetes(7.62%), whereas the community ofArchaeais scarcely present in the study site and the two identified operational taxonomic units (OTUs) are far from what is known in the GenBank database. The study shows several uncharacterized sequences, indicating that the water of 'Hammam Essalihine' hot spring contains undescribed microorganisms. This study is thought to add to the understanding of thermophile diversity and ecology of 'Hammam Essalihine' hot spring.
Effect of radiotherapy on coronary arteries and heart in breast-conserving surgery: a dosimetric analysis
RADIOLOGY AND ONCOLOGY
Authors: Gocer, Gulsen Pinar Soydemir; Ozer, Elif Eda
Abstract
Background. There are certain risks of radiotherapy (RT), especially patients with left-sided breast cancer have a higher tendency to develop cardiac complications than the right-sided cancers. This study aims to perform a dosimetric analysis the effect of RT on coronary arteries and heart in breast-conserving surgery. Patients and methods. A total of 40 patients with early stage right and left-sided breast carcinomas (T1/T2 + NO) were randomly selected. RT was delivered to the entire breast, and tumor beds were boosted in these patients using tangential fields with computed tomography based planning. The doses for Left anterior descending coronary artery (LAD), left circumflex coronary artery (LCx), right ventricle (RV), left ventricle (LV), and heart were recorded and median values compared between groups. Results. The highest mean of radiation dose in patients with left-sided breast cancer was to LAD 2402.48 +/- 838.39 cGy, while the highest mean dose in right-sided breast cancer patients was to RV 130.18 +/- 24.92. The highest maximum dose of radiotherapy was applied to heart at left-sided breast cancer patients as well as at right-sides prients. The mean V5 of the LV was 18.68% (6.89-31.69), mean V25 of the LV was 5.22% (0.45-16.54), mean V5 in bilateral ventricles was 23.73% (2.56-26.89), and mean V25 in bilateral ventricles 6.78% (0.63-13.63). Conclusions. Especially in left-sided breast cancer, the most direct and best strategy to reduce and protect radiation-induced cardiac injury is to balance dose constraints between several high-dose regions of cardiac substructures and the mean heart dose.