To unvestugate the evolutuon law and unfluenced factors of dussolved organuc matter for electron transfer capacuty durung unutual landfull stage, dussolved organuc matter ( DOM ) was extracted from landfull wastes at dufferent depth. Shewanella oneudensus MR-1 and cutrate uron ( FeCut ) were respectuvely used as electron donor and electron acceptor to measure electron donatung capacuty, electron acceptung capacuty and electron shuttlung capacuty. Afterwards, the unfluenced factors of electron transfer capacuty were studued by analyzung spectral unformatuon. The results showed that proteun-luke components and humuc-luke components were able to transfer electrons, and they also accepted electrons from mucroorganusms. Electron donatung capacuty and electron acceptung capacuty uncreased furstly and then decreased. However, the electron shuttlung capacuty uncreased persustently durung the landfull process. Proteun-luke components were the maun components of dussolved organuc matter durung the unutual landfull stage, and ut was maunly responsuble for the electron donorung capacuty and electron acceptung capacuty of DOM. Electron shuttlung capacuty resulted from humuc-luke components durung the cycluc redox process. Electron shuttlung capacuty persustently uncreased durung the landfull process based on humuc-luke components generated durung the stage.

Reduction capacity ( RC ) is an important index to evaluate the redox ability of dissolved organic matter. In order to determine the RC, hydrophilic organic fractions ( HyI ) isolated from dissolved organic matter extracted from the uncomposted and composted samples were used as electron donators and mediators, and three kinds of irons were chosen as electron acceptors. The results showed that, the RC values from the composted sample were 15. 88, 13. 41 and 51. 45 mmol e -/mol C for the electron acceptors Fe2(SO4)3, Fe(NO3)3 and FeCit, respectively, which were higher than the corresponding values (13. 45, 11. 77 and 43. 16 mmol e-/mol C) from the uncomposted sample. The electron acceptor type shows a dramatic influence on the RC value of HyI. The RC value determined by FeCit was obviously higher than that measured using Fe2( SO4 ) 3 and Fe( NO3 ) 3 , and the microbial reducing capacity of the HyI was lower than the corresponding native reducing capacity. By analyzing the special absorbencies ( SUVA254 and SUVA280 ) , absorbance ratios ( A2/A3 and A4/A6 ) and integrated area from UV-vis spectra, it can be found that the RC was affected by aromatic degree, unsaturated conjugated structure, and molecular weight. Excitation-emission matrix spectra coupled with regional integration analysis showed that the relative content of humic-like substances ( humic-like acids and fulvic-like acids) was the main factor influencing the RC value of HyI. The results obtained can be used to characterize the redox properties of HyI, and reveal its role in the transformation and degradation of pollutants during composting.

Objective: To understand the epidemiological and clinical features of patients with hemorrhagic fever and renal syndrome (HFRS) in Shenzhen, and to accumulate experience in the diagnosis and treatment of HFRS in this area. Methods: A retrospective analysis was conducted by collecting the clinical data from 46 patients who were confirmed with HFRS and admitted to the Department of Infectious Diseases of Shenzhen People's Hospital from January 2015 to December 2018. The demographic characteristics, epidemiological, clinical manifestations, examinations, treatments and prognosis, and other characteristics were analyzed. Results: All the 46 patients with HFRS were residens in Shenzhen, with a male-to-female ratio of 6.67∶1.00(40∶6), aged (40.18 ± 15.63) years old, and 38 patients (82.61%) aged 23-45 years old. There were 41 patients (89.13%) with a history of HFRS epidemiology, and there were mice in their houses or workplaces. The houses of 39 patients (84.78%) were rented, and 34 patients(87.18%) rented their houses in urban villages. There were morbidity throughout the year, and 33 patients (71.74%) were ill from January to June. In clinical classification, 44 cases (95.65%) were mild, 2 cases (4.35%) were medium, and there were no severe or critical cases. The clinical manifestations were that all patients were hospitalized due to fever mainly with hyperthermia. Thirty-nine patients (84.78%) were presented with systemic aches, headaches, low back pain and eyelid pain, and 28 patients (60.87%) had skin and mucous membrane hyperemia flushing. Clinical stages showed that all patients had pyretogenesis stage and polyuria stage, including pyretogenesis stage [(7.34 ± 6.82) d], polyuria stage [(9.94 ± 5.77) d], only 4.35% (2/46) patients with hypotension shock stage, all patients did not have oliguric stage. On the next day of admission, the number of white blood cells in 46 patients was (8.17 ± 3.19) × 10⁹/L, and 38 cases (82.61%) in the normal range; platelet was (61.92 ± 32.53) × 10⁹/L, and 42 cases (91.30%) were decreased; the procalcitonin was (1.62 ± 0.38) ng/ml, and 41 cases (89.13%) were increased; C-reactive protein was (74.33 ± 30.48) mg/L, and 46 patients (100.00%) were elevated; creatinine was (176.25 ± 55.15) μmol/L, and 19 cases (41.30%) were increased. Abnormal liver function was manifested by increased enzymology, alanine aminotransferase was (137.58 ± 46.76) U/L, and aspartate aminotransferase was (129.82 ± 40.29) U/L. All patients were positive for Hantavirus IgM. B-ultrasound results showed that in 58.70% (27/46) patients, both kidneys were plump and the parenchymal echo was enhanced. Liver injury occurred in 39 patients (84.78%) and sinus bradycardia in 2 patients (4.35%). All the 46 patients were clinically cured. Conclusion The epidemiological characteristics of patients with HFRS in Shenzhen are typical, the clinical manifestations are mild, and the curative effect and prognosis are good.