scholarly journals Key factors controlling microbial distribution on a DNAPL source area

2021 ◽  
Author(s):  
Jofre Herrero ◽  
Diana Puigserver ◽  
Ivonne Nijenhuis ◽  
Kevin Kuntze ◽  
José M. Carmona
Keyword(s):  
Microbial Community ◽  
Chlorinated Solvents ◽  
Source Area ◽  
Statistical Correlation ◽  
Vital Role ◽  
Environmental Data ◽  
Geochemical Data ◽  
Key Factors ◽  
Terminal Electron Acceptor ◽  
Microbial Distribution

AbstractChlorinated solvents are among the common groundwater contaminants that show high complexity in their distribution in the subsoil. Microorganisms play a vital role in the natural attenuation of chlorinated solvents. Thus far, how the in situ soil microbial community responds to chlorinated solvent contamination has remained unclear. In this study, the microbial community distribution within two boreholes located in the source area of perchloroethene (PCE) was investigated via terminal restriction fragment length polymorphism (T-RFLP) and clone library analysis. Microbial data were related to the lithological and geochemical data and the concentration and isotopic composition of chloroethenes to determine the key factors controlling the distribution of the microbial communities. The results indicated that Proteobacteria, Actinobacteria, and Firmicutes were the most abundant phylums in the sediment. The statistical correlation with the environmental data proved that fine granulometry, oxygen tolerance, terminal electron-acceptor processes, and toxicity control microbial structure. This study improves our understanding of how the microbial community in the subsoil responds to high concentrations of chlorinated solvents.

scholarly journals Key Factors Controlling Microbial Distribution on a DNAPL Source Area

2021 ◽  
Author(s):  
Jofre Herrero ◽  
Diana Puigserver ◽  
Ivonne Nijenhuis ◽  
Kevin Kuntze ◽  
José M. Carmona
Keyword(s):  
Microbial Community ◽  
Chlorinated Solvents ◽  
Source Area ◽  
Vital Role ◽  
Environmental Data ◽  
Geochemical Data ◽  
Key Factors ◽  
High Concentration ◽  
Terminal Electron Acceptor ◽  
Microbial Distribution

Abstract The chlorinated solvents are among the common groundwater contaminants that show high complexity in their distribution in the subsoil. Microorganisms play a vital role in the natural attenuation of chlorinated solvents. Up to now, how the in situ soil microbial community responds to chlorinated solvents contamination remains unclear. In this study, the microbial community distribution within two boreholes located in the source area of perchloroethene (PCE) were investigated via terminal restriction fragment length polymorphism (T-RFLP) and clone library analysis. Microbial data were related to the lithological and geochemical data and the concentration and isotopic composition of chloroethenes to stablish the key factors controlling the distribution of the microbial communities. The results indicated that Proteobacteria, Actinobacteria and Firmicutes were the most abundant phylums in the sediment. The statistical correlation with the environmental data proved that fine granulometry, oxygen tolerance, terminal electron acceptor processes and toxicity control microbial structure. This study improves our understanding of how the microbial community in the subsoil responds to high concentration of chlorinated solvents.

scholarly journals The Impact of Tracheotomy on the Eventual Outcome of Surgery for Benign Laryngotracheal Stenosis in a Tertiary Health Care Setup

2015 ◽  
Vol 7 (2) ◽  
pp. 51-56
Keyword(s):  
Health Care ◽  
Vital Role ◽  
Definitive Treatment ◽  
Laryngotracheal Stenosis ◽  
Key Factors ◽  
Tertiary Healthcare ◽  
History Of ◽  
The Impact ◽  
Eventual Outcome ◽  
Outcome Of Surgery

ABSTRACT Introduction Acquired benign laryngotracheal stenosis is often preventable. A majority of such patients have a history of some airway intervention, ranging from a planned endotracheal intubation for the purpose of anesthesia, to an emergency tracheotomy in the setting of stridor. The primary aim of the first treating clinician is to secure the airway, and often these patients already have a tracheotomy at the time of initial presentation. Materials and methods We analyzed 80 patients that have been managed for varying grades and locations of acquired benign laryngotracheal stenosis presenting to a tertiary healthcare centre, and analyzed the impact of tracheotomy on the eventual outcome. Summary and conclusion Tracheotomies performed in patients suffering from stenosis in the airway pose technical challenges. If planned even in the most urgent situations, they can play a vital role in determining the eventual outcome of the definitive treatment. The site, technique and care of the tracheotomy are key factors in determining the eventual outcome. How to cite this article Hathiram BT, Khattar VS. The Impact of Tracheotomy on the Eventual Outcome of Surgery for Benign Laryngotracheal Stenosis in a Tertiary Health Care Setup. Int J Otorhinolaryngol Clin 2015;7(2):51-56.

scholarly journals Inferring directional relationships in microbial communities using signed Bayesian networks

BMC Genomics ◽  
2020 ◽  
Vol 21 (S6) ◽  
Author(s):  
Musfiqur Sazal ◽  
Kalai Mathee ◽  
Daniel Ruiz-Perez ◽  
Trevor Cickovski ◽  
Giri Narasimhan
Keyword(s):  
Microbial Community ◽  
Bayesian Networks ◽  
Bayesian Network ◽  
Microbial Communities ◽  
Community Analysis ◽  
Vital Role ◽  
Microbe Interactions ◽  
Health And Disease ◽  
Colonization Patterns ◽  
Host Microbe Interactions

Abstract Background Microbe-microbe and host-microbe interactions in a microbiome play a vital role in both health and disease. However, the structure of the microbial community and the colonization patterns are highly complex to infer even under controlled wet laboratory conditions. In this study, we investigate what information, if any, can be provided by a Bayesian Network (BN) about a microbial community. Unlike the previously proposed Co-occurrence Networks (CoNs), BNs are based on conditional dependencies and can help in revealing complex associations. Results In this paper, we propose a way of combining a BN and a CoN to construct a signed Bayesian Network (sBN). We report a surprising association between directed edges in signed BNs and known colonization orders. Conclusions BNs are powerful tools for community analysis and extracting influences and colonization patterns, even though the analysis only uses an abundance matrix with no temporal information. We conclude that directed edges in sBNs when combined with negative correlations are consistent with and strongly suggestive of colonization order.

scholarly journals Evaluation of DBPs formation from SMPs exposed to chlorine, chloramine and ozone

2016 ◽  
Vol 15 (2) ◽  
pp. 185-195 ◽  
Author(s):  
Beibei Zhang ◽  
Qiming Xian ◽  
Jian Lu ◽  
Tingting Gong ◽  
Aimin Li ◽  
...  
Keyword(s):  
Natural Organic Matter ◽  
Chlorinated Solvents ◽  
Good Alternative ◽  
Haloacetic Acids ◽  
Soluble Microbial Products ◽  
Key Factors ◽  
Factors Affecting ◽  
Important Group ◽  
Microbial Products ◽  
By Products

Soluble microbial products (SMPs) are an important group of components in wastewater effluents. In this study, the formation of disinfection by-products (DBPs), including trihalomethanes (THMs), haloacetic acids (HAAs), chlorinated solvents (CSs), haloketones (HKs), haloacetonitriles (HANs) and trichloronitromethane (TCNM) (chloropicrin), from SMPs during chlorination, chloramination and ozonation was investigated. More carbonaceous DBPs (C-DBPs: THMs, HAAs, CSs and HKs) and nitrogenous DBPs (N-DBPs: HANs and TCNM) were formed in chlorination than chloramination. More dichloroacetic and N-DBPs, and higher DBP formation potential were generated by SMPs than by natural organic matter. The results also show that disinfection factors, including temperature, pH, disinfectant dose, reaction time and bromide level significantly affected the formation of DBPs from SMPs. Additionally, the bromine incorporation factor indicates that chloramination may be a good alternative to chlorination in reducing the formation of Br-DBPs from SMPs. Bromide level and pH were the key factors affecting the formation of DBPs in both chlorination and chloramination.

scholarly journals Compressive Behavior of Carbon Nanotube Reinforced Polypropylene Composites Under High Strain Rate: Insights From Molecular Dynamics

2021 ◽  
Author(s):  
Brijesh Mishra ◽  
Sumit Sharma
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotube ◽  
Strain Rate ◽  
Compressive Strain ◽  
Md Simulations ◽  
Vital Role ◽  
Key Factors ◽  
Single Walled Carbon Nanotube ◽  
Vacancy Defects ◽  
Polypropylene Composites

Abstract Since the discovery of carbon nanotubes (CNTs), these have received a lot of attention because of their unusual mechanical electrical properties. Strain rate is one of the key factors that play a vital role in enhancing the mechanical properties of nanocomposites. In this study, (4, 4) armchair single-walled carbon nanotube (SWCNT) was employed with the polymer matrix as polypropylene (PP). The influence of compressive strain rate on SWCNT/PP nanocomposites was evaluated using MD simulations, and mechanical properties have been predicted. Stone-Wales (SW) and vacancy defects, were integrated on the SWCNT. The maximum Young’s modulus (E) of 81.501 GPa was found for the pristine SWCNT/PP composite for a strain rate of 1010 s-1. The least value of E was 45.073GPa for 6% SW defective/PP composite for a strain rate of 108 s-1. While the 6% vacancy defective CNT/PP composite showed the lowest value of E as 39.57GPa for strain rate 108 s-1. It was found that the mechanical properties of SWCNT/PP nanocomposites decrease with the increase in percent defect. It was also seen that the mechanical properties were enhanced with the increment in the applied strain rate. The results obtained from this study could be useful for the researchers designing PP-based materials for compression loading to be used for biomedical applications.

scholarly journals Inferring directional relationships in microbial communities using signed Bayesian networks

2020 ◽  
Author(s):  
Musfiqur Sazal ◽  
Kalai Mathee ◽  
Daniel Ruiz-Perez ◽  
Trevor Cickovski ◽  
Giri Narasimhan
Keyword(s):  
Microbial Community ◽  
Bayesian Networks ◽  
Bayesian Network ◽  
Microbial Communities ◽  
Community Analysis ◽  
Vital Role ◽  
Microbe Interactions ◽  
Health And Disease ◽  
Colonization Patterns ◽  
Host Microbe Interactions

AbstractBackgroundMicrobe-microbe and host-microbe interactions in a microbiome play a vital role in both health and disease. However, the structure of the microbial community and the colonization patterns are highly complex to infer even under controlled wet laboratory conditions. In this study, we investigate what information, if any, can be provided by a Bayesian Network (BN) about a microbial community. Unlike the previously proposed Co-occurrence Networks (CoNs), BNs are based on conditional dependencies and can help in revealing complex associations.ResultsIn this paper, we propose a way of combining a BN and a CoN to construct a signed Bayesian Network (sBN). We report a surprising association between directed edges in signed BNs and known colonization orders.ConclusionsBNs are powerful tools for community analysis and extracting influences and colonization patterns, even though the analysis only uses an abundance matrix with no temporal information. We conclude that directed edges in sBNs when combined with negative correlations are consistent with and strongly suggestive of colonization order.

scholarly journals Corporate Governance Practices In Selected Indian Financial Institutions

2012 ◽  
Vol 5 ◽  
Author(s):  
Suman Kalyan Chaudhury ◽  
Sanjay Kanti Das ◽  
Devi Prasad Mishra
Keyword(s):  
Corporate Governance ◽  
Board Of Directors ◽  
Financial Institutions ◽  
Financial Reporting ◽  
Vital Role ◽  
Key Factors ◽  
Additional Information ◽  
Governance Practices ◽  
Increasing Demand

It has been realized that Corporate Governance is vital for better management of any organization. Financial reporting and disclosure of any information are the key factors of corporate governance. Financial Institutions are no exceptions and there has been increasing demand for transparency in functioning of these Institutions in view of several scams.In this paper a modest effort is made to discuss the reporting pattern of India’s twelve financial institutions namely SBI, IDBI, SIDBI, IFCI, NABARD, PNB, UBI, BOB, BOI, KMB, NHB and HDFC. Top Six commercial banks namely (SBI, BOB, PNB, KMB UBI & BOI), six developments banks viz. SIDBI, IFCI, HFDC, IDBI, NHB, and NABARD  are selected under study .The rationale for selection of these institutes is that being incorporated organizations, they should have same Corporate Governance standards. In view of transparency in functioning, the role of different Committees has a vital role to play. Six parameters have been chosen for comparison of various corporate governance practices in all these twelve financial institutions namely, Company’s philosophy on Corporate Governance, Formation of Board of Directors, Composition of Board of Directors, Particulars of Director’s, Organizational Committees, and Additional Information supplied in CG report or in the Annual report. 

Use of Foraminifera in Climate Science

2019 ◽  
Author(s):  
Gerhard Schmiedl
Keyword(s):  
Stable Isotope ◽  
Trace Element ◽  
Ocean Circulation ◽  
Transfer Functions ◽  
Isotope Composition ◽  
Sediment Cores ◽  
Environmental Data ◽  
Geochemical Data ◽  
Climate History ◽  
Sediment Types

The understanding of past changes in climate and ocean circulation is to a large extent based on information from marine sediments. Marine deposits contain a variety of microfossils, which archive (paleo)-environmental information, both in their floral and faunal assemblages and in their stable isotope and trace element compositions. Sampling campaigns in the late 19th and early 20th centuries were dedicated to the inventory of sediment types and microfossil taxa. With the initiation of various national and international drilling programs in the second half of the 20th century, sediment cores were systematically recovered from all ocean basins and since then have shaped our knowledge of the oceans and climate history. The stable oxygen isotope composition of foraminiferal tests from the sediment cores delivered a continuous record of late Cretaceous–Cenozoic glaciation history. This record impressively proved the effects of periodic changes in the orbital configuration of the Earth on climate on timescales of tens to hundreds of thousands of years, described as Milankovitch cycles. Based on the origination and extinction patterns of marine microfossil groups, biostratigraphic schemes have been established, which are readily used for the dating of sediment successions. The species composition of assemblages of planktic microfossils, such as planktic foraminifera, radiolarians, dinoflagellates, coccolithophorids, and diatoms, is mainly related to sea-surface temperature and salinity but also to the distribution of nutrients and sea ice. Benthic microfossil groups, in particular benthic foraminifera but also ostracods, respond to changes in water depth, oxygen, and food availability at the sea floor, and provide information on sea-level changes and benthic-pelagic coupling in the ocean. The establishment and application of transfer functions delivers quantitative environmental data, which can be used in the validation of results from ocean and climate modeling experiments. Progress in analytical facilities and procedures allows for the development of new proxies based on the stable isotope and trace element composition of calcareous, siliceous, and organic microfossils. The combination of faunal and geochemical data delivers information on both environmental and biotic changes from the same sample set. Knowledge of the response of marine microorganisms to past climate changes at various amplitudes and pacing serves as a basis for the assessment of future resilience of marine ecosystems to the anticipated impacts of global warming.

scholarly journals Eco-Friendly Photocatalysts for Degradation of Dyes

Catalysts ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1129
Author(s):  
Gee Een Lau ◽  
Che Azurahanim Che Abdullah ◽  
Wan Amir Nizam Wan Ahmad ◽  
Suvik Assaw ◽  
Alvin Lim Teik Zheng
Keyword(s):  
Uv Light ◽  
Antioxidant Properties ◽  
Spherical Shape ◽  
Vital Role ◽  
Synthesis Process ◽  
Synthetic Dyes ◽  
Key Factors ◽  
Degradation Of Dyes ◽  
Low Toxicity ◽  
Industrial Use

In the current era of globalization, synthetic dyes are one of the key factors of water pollution. Photocatalysis constitutes a promising technology for the treatment of wastewater, especially to those containing hard-to-remove organic compounds. Zinc oxide nanoparticles (ZnONPs) play a vital role as a photocatalyst material. This research highlights the synthesized ZnONPs with roselle flower and oil palm leaf extract. The extracts and sodium hydroxide (NaOH) act as reducing agents during the synthesis process. Synthesis without the addition of plant extract is used as blank control for the experiment. Structural and optical studies of the three variants of ZnONPs were performed. High purity of ZnONPs with element Zn and O was obtained. The size of the three variants of ZnONPs was from 10–15 nm and found in agglomerated spherical shape. Large band gap, 3.2 eV was obtained by UV-Vis and high thermal stability was proven by TGA. Oxygen vacancies that assist in the degradation phenomenon were found in ZnONPs. Five percent of ZnONPs with the presence of 10 W UV light could effectively degrade 10 ppm MO in 5 h and MB in 3 h. Besides, high antioxidant properties and low toxicity demonstrated the ability of ZnONPs to be used as photocatalysts. In conclusion, ZnONPs can be further developed for pharmaceutical and industrial use.

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