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Effect of photo-biodegradation and biodegradation on the biogeochemical cycling of dissolved organic matter across diverse surface water bodies

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Journal of Environmental Sciences 2019年第3期31卷 130-147页

作者： m.S.Sankar Padmanava Dash Shatrughan Singh YueHan Lu andrew E.mercer Shuo Chen Department of Geosciences Mississippi State University Department of Geological Sciences University of Alabama Academy for Advanced Interdisciplinary Studies Southern University of Science and Technology

The objective of this research was to quantify the temporal variation of dissolved organic matter(DOm) in five distinct waterbodies in watersheds with diverse types of land use and land cover in the presence and absence of sunlight. The water bodies were an agricultural pond, a lake in a forested watershed, a man-made reservoir, an estuary, and a bay. Two sets of samples were prepared by dispensing unfiltered samples into filtered samples in 1:10 ratio(V/V). The first set was exposed to sunlight(10 hr per day for 30 days) for examining the combined effect of photo-biodegradation, while the second set was stored in dark for examining biodegradation alone. Spectroscopic measurements in tandem with multivariate statistics were used to interpret DOm lability and composition. The results suggest that the agricultural pond behaved differently compared to other study locations during degradation experiments due to the presence of higher amount of microbial humic-like and protein-like components derived from microbial/anthropogenic sources. For all samples, a larger decrease in dissolved organic carbon(DOC) concentration(10.12% ±9.81% for photo-biodegradation and 6.65% ± 2.83% for biodegradation) and rapid transformation of DOm components(i.e., terrestrial humic-like components into microbial humic and protein-like components) were observed during photo-biodegradation *** suggest that sunlight facilitated DOm biodegradation, resulting in simpler recalcitrant molecules regardless of original composition. Overall, it was found that combined effects of light and bacteria are more efficient than bacterial effects alone in remineralizing and altering DOm, which highlights the crucial importance of sunlight in transforming aquatic DOm.

关键词： Photo-biodegradation Biodegradation Dissolved organic matter Land use and land cover Half-life EEm-PARAFAC

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CO2-mediated bicarbonate conversion to concentrated formate in a CEm-based electrolyzer

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Journal of Energy Chemistry 2025年第1期 605-611页

作者： Haocheng Xiong Donghuan Wu Haonan Li andrew Li Qikun Hu Siyao Song Bingjun Xu Qi Lu State Key Laboratory of Chemical Engineering Department of Chemical Engineering Tsinghua University College of Chemistry and molecular Engineering Peking University Ordos Laboratory

Renewable energy-driven bicarbonate conversion to valuable chemicals presents an attractive strategy for mitigating CO2emissions,as bicarbonate can be efficiently generated from the capture of atmospheric CO2using alkaline solutions with reactive *** this work,we present a CO2-mediated bicarbonate conversion to pure formate using a cation exchange membrane-based electrolyzer with a 25 cm2electrode *** electrolysis achieved selectivities exceeding 75%for formate at a total current of 2.5 A,achieving formate concentrations up to 1.2 m and yields as high as 95%over extended *** techno-economic assessment confirmed the economic viability of the process,highlighting the potential for bicarbonate electrolysis as a sustainable method for producing valuable chemicals.

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Branched hybridization chain reaction-using highly dimensional DNA nanostructures for label-free,reagent-less,multiplexed molecular diagnostics

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microsystems & Nanoengineering 2019年第1期5卷 316-322页

作者： Gaolian Xu mingliang Lai Rab Wilson andrew Glidle Julien Reboud Jonathan m.Cooper Division of Biomedical Engineering James Watt School of EngineeringUniversity of GlasgowOakfield AvenueGlasgow G128LTUK

The specific and multiplexed detection of DNA underpins many analytical methods,including the detection of microorganisms that are important in the medical,veterinary,and environmental *** achieve such measurements generally requires enzyme-mediated amplification of the low concentrations of the target nucleic acid sequences present,together with the precise control of temperature,as well as the use of enzyme-compatible *** inevitably leads to compromises between analytical performance and the complexity of the *** hybridization chain reaction(HCR)provides an attractive alternative,as a route to enzyme-free DNA *** date,the linear nucleic acid products,produced during amplification,have not enabled the development of efficient multiplexing strategies,nor the use of label-free ***,we show that by designing new DNA nanoconstructs,we are able,for the first time,to increase the molecular dimensionality of HCR products,creating highly branched amplification products,which can be readily detected on label-free *** show that this new,branching HCR system offers a route for enzyme-free,label-free DNA detection,we demonstrate the multiplexed detection of a target sequence(as the initiator)in whole *** the future,this technology will enable rapid point-of-care multiplexed clinical analysis or in-the-field environmental monitoring.

关键词： reagent attractive branching

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Pancreaticopleuralfistula:etiology,treatmentandlong-termfollow-up

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Hepatobiliary & Pancreatic Diseases International 2012年第2期11卷 215-219页

作者： Keith J Roberts maria Sheridan Gareth morris-Stiff andrew m Smith Department of Pancreatic Surgery St James University HospitalLeedsUK

BACKGROUND:Pancreaticopleural fistula(PPF) are *** multidisciplinary treatment is required due to nutritional compromise and *** is the first description of long-term follow-up of patients with ***:Eleven patients with PPF treated at a specialist unit were ***,investigation,treatment and outcomes were ***:Pancreatitis was the etiology of the PPF in 9 patients,and in the remaining 2 the PPF developed following distal ***-sectional imaging demonstrated the site of duct disruption in 10 cases,with endoscopic retrograde cholangiopancreatography identifying the final *** of pancreatic exocrine secretion and percutaneous drainage formed the mainstay of *** cases resolved following pancreatic duct stent insertion and three patients required surgical treatment for established *** were no *** all cases that resolved there has been no recurrence of PPF over a median follow-up of 50 months(range 15-62).CONCLUSIONS:PPF is an uncommon event complicating pancreatitis or pancreatectomy;pancreatic duct disruption is the common link.A step-up approach consisting of minimally invasive techniques treats the majority with surgery needed for refractory sepsis.

关键词： pancreatic disease pancreatitis pancreatic pseudocyst

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microbiome and colorectal carcinogenesis:Linked mechanisms and racial differences

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World Journal of Gastrointestinal Oncology 2022年第2期14卷 375-395页

作者： Sofia C Tortora Vimal m Bodiwala andrew Quinn Laura A martello Shivakumar Vignesh Department of medicine and Division of Gastroenterology&Hepatology SUNY Downstate Health Sciences UniversityBrooklynNY 11203United States

Various studies have shown the interplay between the intestinal microbiome,environmental factors,and genetic changes in colorectal cancer(CRC)*** this review,we highlight the various gut and oral microbiota associated with CRC and colorectal adenomas,and their proposed molecular mechanisms in relation to the processes of“the hallmarks of cancer”,and differences in microbial diversity and abundance between race/*** with CRC showed increased levels of Bacteroides,Prevotella,Escherichia coli,enterotoxigenic Bacteroides fragilis,Streptococcus gallolyticus,Enterococcus faecalis,Fusobacterium nucleatum(***)and Clostridium *** levels of Bacteroides have been found in African American(AA)compared to Caucasian American(CA)***-inflammatory bacteria such as *** and Enterobacter species were significantly higher in ***,AA patients have been shown to have decreased microbial diversity compared to CA *** studies have shown that using microbiome profiles in conjunction with certain risk factors such as age,race and body mass index may help predict healthy colon vs one with adenomas or *** is one of the most common bacterial infections in humans and is more prevalent in Non-Hispanic-Blacks as compared to Non-Hispanic *** condition causes increased systemic inflammation,immune dysregulation,gut microbiota dysbiosis and thereby possibly influencing colorectal ***-associated bacteria such as Fusobacterium,Prevotella,Bacteroides and Porphyromonas have been found in CRC tissues and in feces of CRC ***,a deeper understanding of the association between oral and gastrointestinal bacterial profile,in addition to identifying prevalent bacteria in patients with CRC and the differences observed in ethnicity/race,may play a pivotal role in predicting incidence,prognosis,and lead to the development of new treatments.

关键词： Colorectal cancer Oral microbiome Gut microbiome Hallmarks of cancer Racial/ethnic microbial diversity

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Hepatic metastatic disease in pediatric and adolescent solid tumors

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World Journal of Hepatology 2015年第14期7卷 1807-1817页

作者： Israel Fernandez-Pineda John A Sandoval andrew m Davidoff Department of Surgery St. Jude Children’s Research Hospital

The management of hepatic metastatic disease from solid tumors in adults has been extensively described and resection of metastatic liver lesions from colorectal adenocarcinoma, renal adenocarcinoma, breast cancer, testicular cancer, and neuroendocrine tumors(NET) havedemonstrated therapeutic benefits in select patients. However, there are few reports in the literature on the management of hepatic metastatic disease in the pediatric and adolescent populations and the effectiveness of hepatic metastasectomy. This may be due to the much lower incidence of pediatric malignancies and the higher chemosensitivity of childhood tumors which make hepatic metastasectomy less likely to be required. We review liver involvement with metastatic disease from the main pediatric solid tumors, including neuroblastoma and Wilms tumor focusing on the management and treatment options. We also review other solid malignant tumors which may have liver metastases including germ cell tumors, gastrointestinal stromal tumors, osteosarcoma, desmoplastic small round cell tumors and NET. However, these histological subtypes are so rare in the pediatric and adolescent populations that the exact incidence and best management of hepatic metastatic disease are unknown and can only be extrapolated from adult series.

关键词： Hepatic metastatic disease Pediatric andadolescent solid tumors Neuroblastoma Wilms tumor

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Ischemic cholangiopathy after livertransplantation

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Hepatobiliary & Pancreatic Diseases International 2005年第4期4卷 495-501页

作者： andrew m. Cameron Ronald W. Busuttil Division of Liver and Pancreas Transplantation Department of SurgeryDavid Geffen School of Medicine at UCLALos AngelesCalifornia 90095-7054USA

Orthotopic liver transplantation ( OLT) has evolved over the last forty years from an experimental endeavor to standard of care therapy for many patients with end stage hepatic disease. many technical advances have contributed to the current success of OLT, but surgical complications, especially involving the biliary reconstruction, remain a morbid problem. Biliary complications after OLT include leaks and strictures. Strictures may be anastoinotic or intrahepatic and diffuse, as seen in cases of hepatic artery thrombosis. Current efforts to expand the limited donor pool include the use of non-heart beating donors. The organ procurement process in these donors entails an increased period of warm ischemia and results with non-heart beating donor grafts have been mixed. It is now appreciated that there is an increased incidence of subsequent diffuse biliary stricturing or ' ischemic cholangiopathy' in recipients of these organs. Animal models of this phenomenon and potential therapeutic strategies targeted at ischemic cholangiopathy are being developed with potential applicability to non-heart beating donation and will be the focus of this review.

关键词： orthotopic liver transplantation biliary strictures non-anastoinotic strictures ischemic cholangiopathy non-heart beating donor

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本·胡尔英文插图本

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丛书名：小书架插图版英语世界名著系列丛书

2002年

作者：（美）lew Wallace

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Large quantum alphabets with a tiny footprint

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Light(Science & Applications) 2024年第9期13卷 1701-1703页

作者： Fazilah Nothlawala andrew Forbes School of Physics University of the WitwatersrandJohannesburgSouth Africa

High-dimensional quantum states are known to offer advantages over their two-dimensional qubit counterparts,but their preparation and manipulation has been bulky and ***,quantum state control has been demonstrated on-chip with a~1μm2 footprint and nm-scale features,producing up to eight-dimensional quantum states and ushering in a new route to large quantum information encoding on a small footprint.

关键词： quantum states dimensional

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Strong Laws of Large Numbers for Double Sums of Banach Space Valued Random Elements

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Acta mathematica Sinica,English Series 2019年第5期35卷 583-596页

作者： Robert PARKER andrew ROSALSKY Department of Biostatistics University of Florida Department of Statistics University of Florida

For a double array {V_(m,n), m ≥ 1, n ≥ 1} of independent, mean 0 random elements in a real separable Rademacher type p(1 ≤ p ≤ 2) Banach space and an increasing double array {b_(m,n), m ≥1, n ≥ 1} of positive constants, the limit law ■ and in L_p as m∨n→∞ is shown to hold if ■ This strong law of large numbers provides a complete characterization of Rademacher type p Banach spaces. Results of this form are also established when 0 mean 0 conditions are placed on the random elements and without any geometric conditions placed on the underlying Banach space.

关键词： Real separable Banach space double array of independent random elements strong law of large numbers almost sure convergence Rademacher type p Banach space convergence in Lp

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