Comparison of soil bacterial diversity and community composition between clear-cut logging and control sites in a temperate deciduous broad-leaved forest in Mt. Sambong, South Korea

Deforestation or clear-cut logging affects forest ecosystems,including soil microbial communities.The purpose of this study was to investigate the effects of clearcut logging on the soil bacterial community in a temperate deciduous broad-leaved forest on Mt.Sambong,South Korea.We investigated the physicochemical characteristics and bacterial diversity of the soil in clear-cut logging and control sites.The available phosphorus(AP)level in soil was significantly lower in the clear-cut sites than in the control;however,the other physicochemical properties of soil were similar at the two sites.By examining the bacterial 16S rRNA gene using next-generation sequencing,we found that the number of bacterial taxa at the species and phylum level were similar at the control and clear-cut sites.Consistent with the high resilience of bacterial communities and absence of change in the soil physicochemical properties—with the exception of AP—we found similar levels of bacterial diversity at the two sites.Although most taxa showed similar composition ratios at the control and the clear-cut sites,some taxa such as Deltaproteobacteria,Ktedonobacteriales,Myxocccales,Polyangiaceae,Pedosphaera_f,and Solibacter showed differences after clear-cut logging.We conclude that AP was significantly associated with those bacterial taxa that showed differences in their composition ratios following clear-cut logging.

Thoracic pyogenic infectious spondylitis presented as pneumothorax:A case report

BACKGROUND Pyogenic infectious spondylitis(PIS)is a rare condition,with an incidence between 0.2 and 2 cases per 100000 per annum.It’s most common symptom-back or neck pain-occurs in more than 90%of cases.Herein,we reported a case of thoracic PIS accompanied by pneumothorax in a 65-year-old male patient.CASE SUMMARY A 65-year-old man presented with right chest pain and dyspnea.The initial erect posteroanterior chest radiography revealed pneumothorax,which was further evaluated by chest computed tomography,revealing pleural effusion in the right lung and a paravertebral abscess with bony destruction of vertebral body.Based on magnetic resonance imaging,the patient was diagnosed with thoracic infectious spondylitis with an anterior paravertebral abscess.He was prescribed antibiotics and underwent neurosurgery due to aggravated symptoms and neurologic deficit.Tissue examination revealed that the cause of pleural effusion and pneumothorax was Staphylococcus aureus infection contiguously spread to lung pleura.After several surgical treatments with intravenous antibiotic therapy for two months and transition to oral antibiotics(rifampin 600 mg qd and ciprofloxacin 500 mg bid),the patient received physical therapy to recover balance.One month after discharge,the patient had no chest pain or dyspnea,and exhibited no elevation in inflammatory markers or new thoracic lesions.CONCLUSION To our knowledge,this is the very first report of a case of thoracic PIS with pneumothorax.

Cardiac rehabilitation in a heart failure patient after left ventricular assist device insertion and subsequent heart transplantation:A case report

BACKGROUND Insertion of a left ventricular assist device(LVAD)and heart transplantation(HT)improve the survival of patients with heart failure.In addition,cardiac rehabilitation(CR)further increases the functional capacity.This case report describes a successful case of CR after LVAD insertion and subsequent HT.CASE SUMMARY In the present case,during the LVAD insertion period,peak oxygen consumption(VO2)increased by 12.16%after CR.HT was performed 7 mo after the LVAD insertion,and the patient participated in phases I and II CR.The peak VO2 increased from 17.24 to 22.29 m L/kg/min.This improvement was more significant than that reported in previous studies on CR after LVAD insertion or HT.The patient’s quality of life also improved.The total average score of the short form-36 questionnaire increased from 29.5 points at admission to 53.3 points 9 mo after HT.CONCLUSION A tailored CR program after LVAD insertion or HT may improve the patients’quality of life and increase survival.