76
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Fang T, Lu D, Liu X, Feng S, Dong X, Shi X, Zhai J, Cai K. ESTABLISHMENT AND MEANING OF ESOPHAGEAL SQUAMOUS CELL CARCINOMA CELL LINES OF KNOCKDOWN AND OVEREXPRESSION DEMETHYLASE ALKBH5 GENERATED BY LENTIVIRUS. Chest 2019. [DOI: 10.1016/j.chest.2019.02.042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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77
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Wang Y, Yang B, Feng S, Pessino V, Huang B. Multicolor fluorescent imaging by space-constrained computational spectral imaging. OPTICS EXPRESS 2019; 27:5393-5402. [PMID: 30876144 PMCID: PMC6410920 DOI: 10.1364/oe.27.005393] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Revised: 01/12/2019] [Accepted: 01/13/2019] [Indexed: 05/31/2023]
Abstract
Spectral imaging is a powerful technique used to simultaneously study multiple fluorophore labels with overlapping emissions. Here, we present a computational spectral imaging method, which uses sample spatial fluorescence information as a reconstruction constraint. Our method addresses both the under-sampling issue of compressive spectral imaging and the low throughput issue of scanning spectral imaging. With simulated and experimental data, we have demonstrated the reconstruction precision of our method in two and three-color imaging. We have experimentally validated this method for differentiating cellular structures labeled with two red-colored fluorescent proteins, tdTomato and mCherry, which have highly overlapping emission spectra. Our method has the advantage of totally free wavelength choice and can also be combined with conventional filter-based sequential multi-color imaging to further improve multiplexing capability.
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Feng S, Fang Q, Barnett R, Li C, Han S, Kuhlwilm M, Zhou L, Pan H, Deng Y, Chen G, Gamauf A, Woog F, Prys-Jones R, Marques-Bonet T, Gilbert MTP, Zhang G. The Genomic Footprints of the Fall and Recovery of the Crested Ibis. Curr Biol 2019; 29:340-349.e7. [PMID: 30639104 PMCID: PMC6345625 DOI: 10.1016/j.cub.2018.12.008] [Citation(s) in RCA: 72] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Revised: 10/09/2018] [Accepted: 12/06/2018] [Indexed: 01/19/2023]
Abstract
Human-induced environmental change and habitat fragmentation pose major threats to biodiversity and require active conservation efforts to mitigate their consequences. Genetic rescue through translocation and the introduction of variation into imperiled populations has been argued as a powerful means to preserve, or even increase, the genetic diversity and evolutionary potential of endangered species [1-4]. However, factors such as outbreeding depression [5, 6] and a reduction in available genetic diversity render the success of such approaches uncertain. An improved evaluation of the consequence of genetic restoration requires knowledge of temporal changes to genetic diversity before and after the advent of management programs. To provide such information, a growing number of studies have included small numbers of genomic loci extracted from historic and even ancient specimens [7, 8]. We extend this approach to its natural conclusion, by characterizing the complete genomic sequences of modern and historic population samples of the crested ibis (Nipponia nippon), an endangered bird that is perhaps the most successful example of how conservation effort has brought a species back from the brink of extinction. Though its once tiny population has today recovered to >2,000 individuals [9], this process was accompanied by almost half of ancestral loss of genetic variation and high deleterious mutation load. We furthermore show how genetic drift coupled to inbreeding following the population bottleneck has largely purged the ancient polymorphisms from the current population. In conclusion, we demonstrate the unique promise of exploiting genomic information held within museum samples for conservation and ecological research.
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Feng S, Liu HW, Chiu ACF, Ng CWW. A steady-state analytical profile method for determining methane oxidation in landfill cover. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 646:1528-1535. [PMID: 30235637 DOI: 10.1016/j.scitotenv.2018.07.097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Revised: 06/09/2018] [Accepted: 07/08/2018] [Indexed: 06/08/2023]
Abstract
Gas concentration profiles of carbon dioxide (CO2), oxygen (O2), methane (CH4) and nitrogen (N2) are usually measured during tests investigating microbial aerobic methane oxidation in landfill cover. However, only qualitative/limited information can be obtained from gas concentration profiles by existing methods. A new method is proposed to determine methane oxidation in soil quantitatively and comprehensively, including methane oxidation efficiency, stoichiometry, gas transfer mechanism, methane generation rate and gas reaction rate distributions. Governing equations are established based on mass balance for O2, CO2, CH4 and N2 at one-dimensional and steady-state condition. Gas transfer mechanisms considered include gas diffusion, advection and gas reaction. The method utilizes gas concentration profiles to determine gas diffusion for each gas component according to Fick's law. Then gas advections and reactions can be determined by mass balance. The method is validated by (i) published soil column tests investigating methane oxidation and (ii) a calibrated numerical model based on a selected soil column test. The new method is capable of determining methane oxidation efficiency, stoichiometry, gas transfer mechanism, methane generation rate and gas reaction rate distributions for CH4, CO2 and O2.
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80
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Gao ZJ, Jiang Q, Chen XL, Chen Q, Ji XN, Mao YY, Feng S, Dong JJ, Xu KM. [Study of de novo point mutations in known genes among patients with unexplained intellectual disability or developmental delay]. ZHONGHUA YI XUE ZA ZHI 2018; 98:3426-3432. [PMID: 30440138 DOI: 10.3760/cma.j.issn.0376-2491.2018.42.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To analyze the de novo point mutations in known genes among patients with unexplained intellectual disability (ID) or developmental retardation (DD). Methods: A total of 120 outpatients with ID or DD were recruited in the Department of Neurology, Affiliated Children's Hospital of Capital Institute of Pediatrics between September 2015 and April 2017. Target gene sequencing was used to screen the candidate gene. The sequencing data were analyzed by a variety of bioinformatics software. Combining with the phenotypes of the patients, the candidate genetic/genomic variants were identified from next-generation sequencing data. The final pathogenicity of the genetic/genomic variants were interpreted according to the guideline of the American College of Medical Genetics and Genomics (ACMG) for variants after segregation analysis in the parents and necessary family members by Sanger sequencing. The comprehensive physiological function and signaling pathways of 20 disease genes with de novo point mutation discovery was also studied. Results: Among the 120 patients, 23 patients were found to carry clear pathological changes, and the incidence of de novo point variation was 19.2%. The patients included 12 males and 11 females, with an age of 2 months to 6-year-6-month. Five patients were diagnosed with early onset of epileptic encephalopathy. Seven had mental retardation type 5, 6, 8, 19, 20, 22, 39, respectively. Weill-Marchesani syndrome type 2 was found in one case, Wiedemann-Steiner syndrome in one case, Coffin-Siris syndrome in two cases, Rubinstein-Taybi syndrome in one case, GLUT1 deficiency syndrome in one case, Rett syndrome in one case, cardio-facio-cutaneous syndrome 3 in one case, neurodegeneration with brain iron accumulation in one case, corpus callosum local dysplasia in one case, and congenital fibrosis of the extra-ocular muscles in one case. A total of 20 novel mutations were reported in this study. No somatic mutation was found in the samples of 6 patients with mutation and their parents' peripheral blood DNA samples by amplicon-based deep sequencing. This study found that the main disease genes were involved in chromatin remodeling, transcriptional regulation, autophagy body assembly, MAPK signal pathway, DNA methylation, potassium, sodium ion transport, cell skeleton assembly and skeletal muscle development. These genes were significantly enriched in the following biological processes: Ras signaling pathways, transcription factor binding and cancer related signaling pathway. Conclusions: The etiology of children affected with intellectual disability or developmental delay is complex. Harmful de novo point mutation plays an important role in these diseases. Targeted exome/genome sequencing based on the core family is helpful for the molecular diagnosis of patients and the discovery of more genes.
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Shi X, Wang Y, Lu D, Liu X, Feng S, Dong X, Cai K. P2.03-31 LncRNA RGMB-AS1 Affects Lung Adenocarcinoma Prognosis by Regulating Microtube Associated Genes: A Genome-Wide Analysis in Silicon. J Thorac Oncol 2018. [DOI: 10.1016/j.jtho.2018.08.1218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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82
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Feng S, Xu C, Wang W, Zhang Q, Zhuang W, Zhu Y, Huang Y, Chen Y, Chen G, Fang M, Lv T, Song Y. P1.03-01 Association of APC Mutations with Chinese Patients Molecular Spectrum in Non-Small-Cell Lung Cancer. J Thorac Oncol 2018. [DOI: 10.1016/j.jtho.2018.08.682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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83
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Feng S, Nocente M, Wünderlich D, Bonomo F, Croci G, Fantz U, Heinemann B, Kraus W, Mario I, Muraro A, Pasqualotto R, Rebai M, Tardocchi M, Gorini G. Neutron measurements at the ELISE neutral beam test facility and implications for neutron based diagnostics at SPIDER. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2018; 89:10I139. [PMID: 30399769 DOI: 10.1063/1.5036823] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Accepted: 07/03/2018] [Indexed: 06/08/2023]
Abstract
Along the route to the development of a neutral beam injector for ITER, the Padua based Source for Production of Ion of Deuterium Extracted from Rf plasma (SPIDER) and megavolt ITER injector and concept advancement facilities will make use of neutron diagnostics to quantify the homogeneity of the neutral beam profile by measuring the map of the neutron emission from the beam dump with the close-contact neutron emission surface mapping (CNESM) system. Neutrons are here produced from beam-target reactions between the deuterium beam and the deuterons previously adsorbed in the calorimeter. In order to aid the interpretation of the diagnostic data, a dedicated experiment on neutron emission from beam-target reactions with beam parameters approaching those expected at SPIDER has been performed at the Extraction from a Large Ion Source Experiment (ELISE) neutral beam test facility. The time trace of neutron emission has been measured using a calibrated liquid scintillator detector at increasing power densities on the target. Compared to calculations based on the local mixing model, a systematic discrepancy was observed exceeding the statistical accuracy of the measurements and increasing as a linear function of the power density. The data are used to derive an empirical temperature dependent correction for applications to neutron measurements at SPIDER.
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Lu D, Dong X, Feng S, Liu X, Shi X, Wu H, Diao D, Ren P, Cai R, Huang Z, Wang H, Cai K, Xin X, Ji H, Wang Z, Hong C, Sun Y, Yu X. P1.05-09 Dielectric Property Test for the Rapid Differential Diagnosis of Lung Nodules/Mass. J Thorac Oncol 2018. [DOI: 10.1016/j.jtho.2018.08.761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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85
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Kukekova AV, Johnson JL, Xiang X, Feng S, Liu S, Rando HM, Kharlamova AV, Herbeck Y, Serdyukova NA, Xiong Z, Beklemischeva V, Koepfli KP, Gulevich RG, Vladimirova AV, Hekman JP, Perelman PL, Graphodatsky AS, O'Brien SJ, Wang X, Clark AG, Acland GM, Trut LN, Zhang G. Red fox genome assembly identifies genomic regions associated with tame and aggressive behaviours. Nat Ecol Evol 2018; 2:1479-1491. [PMID: 30082739 DOI: 10.1038/s41559-018-0611-6] [Citation(s) in RCA: 78] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Accepted: 06/18/2018] [Indexed: 12/30/2022]
Abstract
Strains of red fox (Vulpes vulpes) with markedly different behavioural phenotypes have been developed in the famous long-term selective breeding programme known as the Russian farm-fox experiment. Here we sequenced and assembled the red fox genome and re-sequenced a subset of foxes from the tame, aggressive and conventional farm-bred populations to identify genomic regions associated with the response to selection for behaviour. Analysis of the re-sequenced genomes identified 103 regions with either significantly decreased heterozygosity in one of the three populations or increased divergence between the populations. A strong positional candidate gene for tame behaviour was highlighted: SorCS1, which encodes the main trafficking protein for AMPA glutamate receptors and neurexins and suggests a role for synaptic plasticity in fox domestication. Other regions identified as likely to have been under selection in foxes include genes implicated in human neurological disorders, mouse behaviour and dog domestication. The fox represents a powerful model for the genetic analysis of affiliative and aggressive behaviours that can benefit genetic studies of behaviour in dogs and other mammals, including humans.
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Rando HM, Farré M, Robson MP, Won NB, Johnson JL, Buch R, Bastounes ER, Xiang X, Feng S, Liu S, Xiong Z, Kim J, Zhang G, Trut LN, Larkin DM, Kukekova AV. Construction of Red Fox Chromosomal Fragments from the Short-Read Genome Assembly. Genes (Basel) 2018; 9:E308. [PMID: 29925783 PMCID: PMC6027122 DOI: 10.3390/genes9060308] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2018] [Revised: 05/19/2018] [Accepted: 06/04/2018] [Indexed: 01/08/2023] Open
Abstract
The genome of a red fox (Vulpes vulpes) was recently sequenced and assembled using next-generation sequencing (NGS). The assembly is of high quality, with 94X coverage and a scaffold N50 of 11.8 Mbp, but is split into 676,878 scaffolds, some of which are likely to contain assembly errors. Fragmentation and misassembly hinder accurate gene prediction and downstream analysis such as the identification of loci under selection. Therefore, assembly of the genome into chromosome-scale fragments was an important step towards developing this genomic model. Scaffolds from the assembly were aligned to the dog reference genome and compared to the alignment of an outgroup genome (cat) against the dog to identify syntenic sequences among species. The program Reference-Assisted Chromosome Assembly (RACA) then integrated the comparative alignment with the mapping of the raw sequencing reads generated during assembly against the fox scaffolds. The 128 sequence fragments RACA assembled were compared to the fox meiotic linkage map to guide the construction of 40 chromosomal fragments. This computational approach to assembly was facilitated by prior research in comparative mammalian genomics, and the continued improvement of the red fox genome can in turn offer insight into canid and carnivore chromosome evolution. This assembly is also necessary for advancing genetic research in foxes and other canids.
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87
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Li J, Feng S, Xia Z. The dawn of unknown-onset strokes. Eur J Neurol 2018; 25:e55. [PMID: 29667354 DOI: 10.1111/ene.13597] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Accepted: 02/07/2018] [Indexed: 11/28/2022]
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88
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Mahar A, Wang P, Ali A, Lahori AH, Awasthi MK, Wang Z, Guo Z, Wang Q, Feng S, Li R, Zhang Z. (Im)mobilization of soil heavy metals using CaO, FA, sulfur, and Na2S: a 1-year incubation study. INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY 2018; 15:607-620. [DOI: 10.1007/s13762-017-1427-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/20/2023]
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Roberts KE, Feng S, Adsett I, Rickett K, Woodward N. Abstract P3-14-06: The prevention and management of chemotherapy-induced peripheral neuropathy in breast cancer patients: A systematic review. Cancer Res 2018. [DOI: 10.1158/1538-7445.sabcs17-p3-14-06] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background: Chemotherapy induced peripheral neuropathy (CIPN) remains a common treatment related adverse event for breast cancer (BC) patients. CIPN interferes with the ability to complete chemotherapy & therefore potentially compromises survival outcomes. CIPN can worsen health-related quality of life and also add to the ongoing morbidity experienced by BC survivors. Previously, systematic reviews & ASCO guidelines have examined CIPN across many cancer types & different chemotherapies, which may lead to the introduction of confounding factors not relevant to BC patients. A recent prospective cohort also identified other specific lifestyle factors associated with CIPN in BC patients (1). From our search, a systematic review specifically looking at CIPN in BC patients has not previously been undertaken.
Methods: We conducted a systematic search in PubMed, EMBASE, CINAHL and CENTRAL. Clinical trials and observational studies for all potential pharmacological and non-pharmacological interventions were included. Risk of bias for full-text papers was assessed using the Cochrane Risk of Bias Assessment or the modified Newcastle Ottawa score.
Results: Of 706 records being identified, 601 unique citations were screened with 21 full text papers retrieved for assessment, and 16 studies included in the qualitative assessment. We identified 10 randomised controlled trials (RCTs), one observational cohort study, and five controlled before-and-after studies (CBA). Pharmacological interventions which were investigated included calcium/magnesium infusion, glutamine, amifostine, goshajinkigan, omega 3 fatty acids, acetyl-L-carnitine, pregabalin, alpha-lipoic acid and minocycline. Non-pharmacological interventions included body mass index & lifestyle factors, electroacupuncture, exercise, limb hypothermia, carbon dioxide limb bathing and limb compression therapy. All trials identified were investigating primary prevention of CIPN in the setting of taxane chemotherapy. Improvements in the incidence of CIPN were reported with omega 3 fatty acids, glutamine and alpha-lipoic acid, but only one of these studies is a published RCT. In two of the studies, the benefit was identified only on physical examination, but no significant benefit with nerve conduction (NCS) testing. On subgroup analysis of trials investigating exercise, there was a benefit in the use of high intensity exercise versus low intensity exercise, particularly in patients <50 years old within a healthy weight range. Mixed results were seen with goshajinkigan. An increase in CIPN was seen with antioxidant use, electroacupuncture and acetyl L carnitine. Majority of the RCTs were associated with a high overall risk of bias.
Conclusions: There has been a paucity of research on CIPN in BC patients. There were no interventions identified in this systematic review which show a clear clinical benefit in the prevention of CIPN in BC patients. BC patients may have specific lifestyle and hormonal factors which influence CIPN and this should prompt ongoing specific patient focussed research within this subgroup with large, blinded, randomised controlled trials.
Greenlee, et al. Natl Cancer Inst 2017; 109(2).
Citation Format: Roberts KE, Feng S, Adsett I, Rickett K, Woodward N. The prevention and management of chemotherapy-induced peripheral neuropathy in breast cancer patients: A systematic review [abstract]. In: Proceedings of the 2017 San Antonio Breast Cancer Symposium; 2017 Dec 5-9; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2018;78(4 Suppl):Abstract nr P3-14-06.
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Sheng GH, Wang CF, Feng S, Gao X, Zhu HL. Characterization and Crystal Structure of a Novel Mononuclear Cobalt(II) Complex with Hydrazone Derived from Protocatechuic Acid. J STRUCT CHEM+ 2018. [DOI: 10.1134/s0022476618010213] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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91
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Hari P, Mateos MV, Abonour R, Knop S, Bensinger W, Ludwig H, Song K, Hajek R, Moreau P, Siegel DS, Feng S, Obreja M, Aggarwal SK, Iskander K, Goldschmidt H. Efficacy and safety of carfilzomib regimens in multiple myeloma patients relapsing after autologous stem cell transplant: ASPIRE and ENDEAVOR outcomes. Leukemia 2017; 31:2630-2641. [PMID: 28439109 PMCID: PMC5729352 DOI: 10.1038/leu.2017.122] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Revised: 03/09/2017] [Accepted: 04/03/2017] [Indexed: 01/12/2023]
Abstract
Autologous stem cell transplantation (ASCT) is a standard treatment for eligible multiple myeloma (MM) patients, but many patients will relapse after ASCT and require subsequent therapy. The proteasome inhibitor carfilzomib is approved for relapsed or refractory MM (RRMM). In phase 3 trials, carfilzomib-based regimens (ASPIRE, carfilzomib-lenalidomide-dexamethasone; ENDEAVOR, carfilzomib-dexamethasone) demonstrated superior progression-free survival (PFS) compared with standard therapies for RRMM (ASPIRE: lenalidomide-dexamethasone; ENDEAVOR, bortezomib-dexamethasone). This subgroup analysis of ASPIRE and ENDEAVOR evaluated outcomes according to prior ASCT status. In total, 446 patients in ASPIRE and 538 in ENDEAVOR had prior ASCT. Median PFS was longer for carfilzomib-based regimens vs non-carfilzomib-based regimens for patients with prior ASCT (ASPIRE: 26.3 vs 17.8 months (hazard ratio (HR)=0.68); ENDEAVOR: not estimable vs 10.2 months (HR=0.61)), those with one prior line of therapy that included ASCT (ASPIRE: 29.7 vs 17.8 months (HR=0.70); ENDEAVOR: not estimable vs 11.2 months (HR=0.46)), and those without prior ASCT (ASPIRE: 26.4 vs 16.6 months (HR=0.76); ENDEAVOR: 17.7 vs 8.5 months (HR=0.43)). Overall response rates also favored the carfilzomib-based regimens. No new safety signals were detected. This analysis suggests that carfilzomib-based treatment may lead to improvement in PFS and response rates regardless of prior transplant status. Further evaluation is warranted.
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92
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Feng S, Leung AK, Ng CWW, Liu HW. Theoretical analysis of coupled effects of microbe and root architecture on methane oxidation in vegetated landfill covers. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 599-600:1954-1964. [PMID: 28549371 DOI: 10.1016/j.scitotenv.2017.04.025] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2017] [Revised: 04/02/2017] [Accepted: 04/04/2017] [Indexed: 06/07/2023]
Abstract
Reduction of soil moisture by plant root-water uptake could improve soil aeration for microbial aerobic methane oxidation (MAMO) in a landfill cover, but excessive soil moisture removal could suppress microbial activity due to water shortage. Existing models ignore the coupled microbe-vegetation interaction. It is thus not known whether the presence of plants is beneficial or adverse to MAMO. This study proposes a newly-improved theoretical model that couples the effects of root-water uptake and microbial activity for capturing water-gas flow and MAMO in unsaturated soils. Parametric studies are conducted to investigate the effects of root characteristics and transpiration rate on MAMO efficiency. Uniform, parabolic, exponential and triangular root architectures are considered. Ignoring the effects of water shortage on microbe over-predicts the MAMO efficiency significantly, especially for plants with traits that give high root-water uptake ability (i.e., uniformly-rooted and long root length). The effects of plants on MAMO efficiency depends on the initial soil moisture strongly. If the soil is too dry (i.e., close to the permanent wilting point), plant-water uptake, with any root architecture considered, would reduce MAMO efficiency as further soil water removal by plants suppresses microbial activity. Plants with exponential or triangular root architectures could preserve 10% higher MAMO than the other two cases. These two architectures are more capable of minimizing the adverse effects of root-water uptake due to microbial water shortage. This implies that high-water-demand plants such as those with long root length and with uniform or parabolic root architectures require more frequent irrigation to prevent from excessive reduction of MAMO efficiency.
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Harbell JW, Morgan T, Feldstein VA, Roll GR, Posselt A, Kang SM, Feng S, Hirose R, Freise CE, Stock P. Splenic Vein Thrombosis Following Pancreas Transplantation: Identification of Factors That Support Conservative Management. Am J Transplant 2017; 17:2955-2962. [PMID: 28707821 DOI: 10.1111/ajt.14428] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Revised: 06/14/2017] [Accepted: 07/03/2017] [Indexed: 01/25/2023]
Abstract
Prophylaxis for graft portal/splenic venous thrombosis following pancreas transplant varies between institutions. Similarly, treatment of venous thrombosis ranges from early re-exploration to conservative management with anticoagulation. We wished to determine the prevalence of graft splenic vein (SV) thrombosis, as well as the clinical significance of non-occlusive thrombus observed on routine imaging. Records of 112 pancreas transplant recipients over a 5-year period at a single center were reviewed. Venous thrombosis was defined as absence of flow or presence of thrombus identified in any part of the graft SV on ultrasound. Thirty patients (27%) had some degree of thrombus or absence of flow in the SV on postoperative ultrasound. There were 5 graft losses in this group. Four were due to venous thrombosis, and occurred within 20 days of transplant. All patients with non-occlusive partial SV thrombus but normal arterial signal on Doppler ultrasound were successfully treated with IV heparin followed by warfarin for 3-6 months, and remained insulin independent. Findings of arterial signal abnormalities, such as absence or reversal of diastolic flow within the graft, require urgent operative intervention since this finding can be associated with more extensive thrombus that may lead to graft loss.
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Nocente M, Feng S, Wünderlich D, Bonomo F, Croci G, Fantz U, Heinemann B, Kraus W, Mario I, Pasqualotto R, Tardocchi M, Gorini G. Experimental investigation of beam-target neutron emission at the ELISE neutral beam test facility. FUSION ENGINEERING AND DESIGN 2017. [DOI: 10.1016/j.fusengdes.2017.03.152] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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95
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Feng S, Ng CWW, Leung AK, Liu HW. Numerical modelling of methane oxidation efficiency and coupled water-gas-heat reactive transfer in a sloping landfill cover. WASTE MANAGEMENT (NEW YORK, N.Y.) 2017; 68:355-368. [PMID: 28545891 DOI: 10.1016/j.wasman.2017.04.042] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Revised: 03/16/2017] [Accepted: 04/24/2017] [Indexed: 06/07/2023]
Abstract
Microbial aerobic methane oxidation in unsaturated landfill cover involves coupled water, gas and heat reactive transfer. The coupled process is complex and its influence on methane oxidation efficiency is not clear, especially in steep covers where spatial variations of water, gas and heat are significant. In this study, two-dimensional finite element numerical simulations were carried out to evaluate the performance of unsaturated sloping cover. The numerical model was calibrated using a set of flume model test data, and was then subsequently used for parametric study. A new method that considers transient changes of methane concentration during the estimation of the methane oxidation efficiency was proposed and compared against existing methods. It was found that a steeper cover had a lower oxidation efficiency due to enhanced downslope water flow, during which desaturation of soil promoted gas transport and hence landfill gas emission. This effect was magnified as the cover angle and landfill gas generation rate at the bottom of the cover increased. Assuming the steady-state methane concentration in a cover would result in a non-conservative overestimation of oxidation efficiency, especially when a steep cover was subjected to rainfall infiltration. By considering the transient methane concentration, the newly-modified method can give a more accurate oxidation efficiency.
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Wisel SA, Gardner JM, Roll GR, Harbell J, Freise CE, Feng S, Kang SM, Hirose R, Kaufman DB, Posselt A, Stock PG. Pancreas-After-Islet Transplantation in Nonuremic Type 1 Diabetes: A Strategy for Restoring Durable Insulin Independence. Am J Transplant 2017; 17:2444-2450. [PMID: 28489277 PMCID: PMC5573612 DOI: 10.1111/ajt.14344] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2017] [Revised: 04/21/2017] [Accepted: 04/22/2017] [Indexed: 01/25/2023]
Abstract
Islet transplantation offers a minimally invasive approach for β cell replacement in diabetic patients with hypoglycemic unawareness. Attempts at insulin independence may require multiple islet reinfusions from distinct donors, increasing the risk of allogeneic sensitization. Currently, solid organ pancreas transplant is the only remaining surgical option following failed islet transplantation in the United States; however, the immunologic impact of repeated exposure to donor antigens on subsequent pancreas transplantation is unclear. We describe a case series of seven patients undergoing solid organ pancreas transplant following islet graft failure with long-term follow-up of pancreatic graft survival and renal function. Despite highly variable panel reactive antibody levels prior to pancreas transplant (mean 27 ± 35%), all seven patients achieved stable and durable insulin independence with a mean follow-up of 6.7 years. Mean hemoglobin A1c values improved significantly from postislet, prepancreas levels (mean 8.1 ± 1.5%) to postpancreas levels (mean 5.3 ± 0.1%; p = 0.0022). Three patients experienced acute rejection episodes that were successfully managed with thymoglobulin and methylprednisolone, and none of these preuremic type 1 diabetic recipients developed stage 4 or 5 chronic kidney disease postoperatively. These results support pancreas-after-islet transplantation with aggressive immunosuppression and protocol biopsies as a viable strategy to restore insulin independence after islet graft failure.
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Cheng L, Broome ME, Feng S, Hu Y. Taking Root: a grounded theory on evidence-based nursing implementation in China. Int Nurs Rev 2017; 65:270-278. [PMID: 28766707 DOI: 10.1111/inr.12396] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Evidence-based nursing is widely recognized as the critical foundation for quality care. AIM To develop a middle-range theory on the process of evidence-based nursing implementation in Chinese context. METHODS A grounded theory study using unstructured in-depth individual interviews was conducted with 56 participants who were involved in 24 evidence-based nursing implementation projects in Mainland China from September 2015 to September 2016. RESULTS A middle-range grounded theory of 'Taking Root' was developed. The theory describes the evidence implementation process consisting of four components (driving forces, process, outcome, sustainment/regression), three approaches (top-down, bottom-up and outside-in), four implementation strategies (patient-centred, nurses at the heart of change, reaching agreement, collaboration) and two patterns (transformational and adaptive implementation). LIMITATIONS Certain perspectives may have not been captured, as the retrospective nature of the interviewing technique did not allow for 'real-time' assessment of the actual implementation process. The transferability of the findings requires further exploration as few participants with negative experiences were recruited. CONCLUSION This is the first study that explored evidence-based implementation process, strategies, approaches and patterns in the Chinese nursing practice context to inform international nursing and health policymaking. The theory of Taking Root described various approaches to evidence implementation and how the implementation can be transformational for the nurses and the setting in which they work. IMPLICATIONS FOR NURSING AND HEALTH POLICY Nursing educators, managers and researchers should work together to improve nurses' readiness for evidence implementation. Healthcare systems need to optimize internal mechanisms and external collaborations to promote nursing practice in line with evidence and achieve clinical outcomes and sustainability.
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Feng S, Machina M, Beattie W. Influence of anaemia and red blood cell transfusion on mortality in high cardiac risk patients undergoing major non-cardiac surgery: a retrospective cohort study. Br J Anaesth 2017; 118:843-851. [DOI: 10.1093/bja/aex090] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/08/2017] [Indexed: 01/19/2023] Open
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Feng S, Yang J, Wang W, Hu X, Liu H, Qian X, Feng D, Zhang X. Incidence and Risk Factors for Cytomegalovirus Infection in Patients With Kidney Transplantation: A Single-Center Experience. Transplant Proc 2017; 48:2695-2699. [PMID: 27788803 DOI: 10.1016/j.transproceed.2016.08.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Accepted: 08/03/2016] [Indexed: 10/20/2022]
Abstract
BACKGROUND Cytomegalovirus (CMV) infection is deemed to be a major cause of morbidity and mortality in patients after kidney transplantation. The purpose of this study was to analyze the incidence of CMV infection and risk factors for CMV infection in our center, to help in determination of its impact on the kidney function in this patient population, and to provide new ideas for the prevention and treatment of CMV infection. METHODS A total of 319 kidney transplant recipients from our center were studied between January 2000 and December 2015. The CMV viral load in each kidney transplant patients was monitored with the use of CMV quantitative nucleic acid testing (CMV-QNAT). Laboratory data and other medical records were also collected. RESULTS The incidence of CMV infection was 8.8% in our studied patients. The patients within 3 to 6 months and 5 to 10 years after transplantation had a higher risk of CMV infection. CMV infection was probably correlated with lower white blood cell counts but elevated hemoglobin, serum creatinine, blood urea nitrogen, potassium, and estimated glomerular filtration rate (eGFR). Anti-CMV immunoglobulin (Ig)G and history of allograft rejection were also associated with CMV infection. In multivariate regression analysis, white blood cells, eGFR, anti-CMV IgG, and history of allograft rejection were the independent risk factors associated with CMV infection in kidney transplantation patients. CONCLUSIONS CMV infection was an important complication after kidney transplantation, particularly in these patients with allograft impairment.
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Feng S, Liao Z, Huang H. Effect of prophylactic placement of internal iliac artery balloon catheters on outcomes of women with placenta accreta: an impact study. Anaesthesia 2017; 72:853-858. [PMID: 28401537 DOI: 10.1111/anae.13895] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/11/2017] [Indexed: 02/05/2023]
Abstract
We performed an impact study on the introduction of routine placement of internal iliac artery balloon catheters for the management of haemorrhage during caesarean section in women with placenta accreta. We identified 11 women, with prenatally diagnosed placenta accreta/increta/percreta before this change in practice, who acted as controls, and 30 women who had iliac artery balloons placed. The balloons were inflated in 27 cases. The median (IQR [range]) intra-operative blood loss was 1100 (800-2600 [500-6000]) ml in controls, compared with 1000 (600-2513 [400-15000]) ml in women with iliac artery balloons (p = 0.64). Six (54%) controls received intra-operative blood transfusion compared with 14 (47%) women with iliac artery balloons (p = 0.66). Caesarean hysterectomy was performed in 3 (27.3%) controls and 13 (43.3%) women with iliac artery balloons (p = 0.48). Balloon catheter insertion was associated with a shortened postoperative hospital stay, 6 (5-7 [4-12] days in controls vs. 5 (4-6 [3-10]) in the iliac artery balloon group (p = 0.033). General anaesthesia was used in six (54%) controls, but all women with iliac artery balloons. This study demonstrates that prophylactic balloon occlusion of the internal iliac arteries did not reduce intra-operative haemorrhage or caesarean hysterectomy in women with placenta accreta undergoing caesarean section. In addition, it has a significant impact on the choice of anaesthetic technique.
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