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https://www.readbyqxmd.com/read/28827706/soil-c-and-n-statuses-determine-the-effect-of-maize-inoculation-by-plant-growth-promoting-rhizobacteria-on-nitrifying-and-denitrifying-communities
#1
Alessandro Florio, Thomas Pommier, Jonathan Gervaix, Annette Bérard, Xavier Le Roux
Maize inoculation by Azospirillum stimulates root growth, along with soil nitrogen (N) uptake and root carbon (C) exudation, thus increasing N use efficiency. However, inoculation effects on soil N-cycling microbial communities have been overlooked. We hypothesized that inoculation would (i) increase roots-nitrifiers competition for ammonium, and thus decrease nitrifier abundance; and (ii) increase roots-denitrifiers competition for nitrate and C supply to denitrifiers by root exudation, and thus limit or benefit denitrifiers depending on the resource (N or C) mostly limiting these microorganisms...
August 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28822937/role-of-earthworms-mucus-in-vermicomposting-system-biodegradation-tests-based-on-humification-and-microbial-activity
#2
Kui Huang, Hui Xia
During vermicomposting, the organic wastes can be recycled into high-value products as mediated by earthworms through gut digestion, burrowing, casting and mucus excretion. However, to date, few studies have been done on the role of mucus in vermicomposting system compared to the effects of the other activities. Hence, this study investigated the potential role of earthworms' mucus in the decomposition and humification of organic wastes. For this, the mucus of Eisenia fetida was extracted and inoculated into three vermicomposting substrates using cow dung (CD), fruit and vegetable wastes (FVW), and sewage sludge (SS)...
August 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28813429/the-impact-of-tree-age-on-biomass-growth-and-carbon-accumulation-capacity-a-retrospective-analysis-using-tree-ring-data-of-three-tropical-tree-species-grown-in-natural-forests-of-suriname
#3
Michael Köhl, Prem R Neupane, Neda Lotfiomran
The world's forests play a pivotal role in the mitigation of global climate change. By photosynthesis they remove CO2 from the atmosphere and store carbon in their biomass. While old trees are generally acknowledged for a long carbon residence time, there is no consensus on their contribution to carbon accumulation due to a lack of long-term individual tree data. Tree ring analyses, which use anatomical differences in the annual formation of wood for dating growth zones, are a retrospective approach that provides growth patterns of individual trees over their entire lifetime...
2017: PloS One
https://www.readbyqxmd.com/read/28813100/first-assessment-of-carbon-stock-in-the-belowground-biomass-of-brazilian-mangroves
#4
Daniel M C Santos, Gustavo C D Estrada, Viviane Fernandez, Marciel R M Estevam, Brunna T DE Souza, Mário L G Soares
Studies on belowground roots biomass have increasingly reported the importance of the contribution of this compartment in carbon stock maintenance in mangrove forests. To date, there are no estimates of this contribution in Brazilian mangrove forests, although the country has the second largest area of mangroves worldwide. For this study, trenches dug in fringing forests in Guaratiba State Biological Reserve (Rio de Janeiro, Brazil) were used to evaluate the contribution of the different classes of roots and the vertical stratification of carbon stock...
August 14, 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28810684/a-new-approach-combining-analytical-methods-for-workplace-exposure-assessment-of-inhalable-multi-walled-carbon-nanotubes
#5
Peter C Tromp, Eelco Kuijpers, Cindy Bekker, Lode Godderis, Qing Lan, Aleksandra D Jedynska, Roel Vermeulen, Anjoeka Pronk
To date there is no consensus about the most appropriate analytical method for measuring carbon nanotubes (CNTs), hampering the assessment and limiting the comparison of data. The goal of this study is to develop an approach for the assessment of the level and nature of inhalable multi-wall CNTs (MWCNTs) in an actual workplace setting by optimizing and evaluating existing analytical methods. In a company commercially producing MWCNTs, personal breathing zone samples were collected for the inhalable size fraction with IOM samplers; which were analyzed with carbon analysis, inductively coupled plasma mass spectrometry (ICP-MS) and scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDX)...
August 1, 2017: Annals of Work Exposures and Health
https://www.readbyqxmd.com/read/28809100/porous-carbon-materials-based-on-graphdiyne-basis-units-by-the-incorporation-of-the-functional-groups-and-li-atoms-for-superior-co2-capture-and-sequestration
#6
Yong Dang, Wenyue Guo, Lianming Zhao, Houyu Zhu
Graphdiyne family has attracted a high degree of concern, because of its intriguing and promising properties. However, graphdiyne materials reported to date represent only a tiny fraction of the possible combinations. In this work, we demonstrate a computational approach to generate a series of conceivable graphdiyne-based frameworks (GDY-Rs and Li@GDY-Rs) by introducing a variety of functional groups (R = -NH2, -OH, -COOH, and -F) and doping metal (Li) in the molecular building blocks of graphdiyne without restriction of experimental conditions and rapidly screen the best candidates for the application of CO2 capture and sequestration (CCS)...
August 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28808544/flower-power-floral-and-resource-manipulations-reveal-how-and-why-reproductive-trade-offs-occur-for-lowbush-blueberry-vaccinium-angustifolium
#7
Alex W Bajcz, Francis A Drummond
Plant reproductive trade-offs are thought to be caused by resource limitations or other constraints, but more empirical support for these hypotheses would be welcome. Additionally, quantitative characterization of these trade-offs, as well as consideration of whether they are linear, could yield additional insights. We expanded our flower removal research on lowbush blueberry (Vaccinium angustifolium) to explore the nature of and causes of its reproductive trade-offs. We used fertilization, defoliation, positionally biased flower removal, and multiple flower removal levels to discern why reproductive trade-offs occur in this taxon and to plot these trade-offs along two continuous axes...
August 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28806637/want-need-and-habit-as-drivers-of-smoking-behaviour-a-preliminary-analysis
#8
Luis Wehbe, Harveen Kaur Ubhi, Robert West
BACKGROUND AND AIMS: Models of tobacco smoking behaviour propose that anticipated pleasure or satisfaction, the need to alleviate a nicotine-induced drive state and a stimulus-driven impulse potentially play an important role. This study aimed to provide a preliminary assessment of how far urges to smoke are reported by smokers and whether the strength of such urges prior to a quit attempt predicts short-term success at quitting. METHODS: In a prospective study, 566 smokers attending a treatment programme to help smokers quit completed a written questionnaire covering frequency of different types of urge to smoke (automatic impulse - 'automatic urges', anticipated pleasure - 'pleasure urges', and fulfilling a need - 'need urges')...
July 19, 2017: Addictive Behaviors
https://www.readbyqxmd.com/read/28805700/bilp-19-an-ultramicroporous-organic-network-with-exceptional-carbon-dioxide-uptake
#9
Christoph Klumpen, Florian Radakovitsch, Andreas Jess, Jürgen Senker
Porous benzimidazole-based polymers (BILPs) have proven to be promising for carbon dioxide capture and storage. The polarity of their chemical structure in combination with an inherent porosity allows for adsorbing large amounts of carbon dioxide in combination with high selectivities over unpolar guest molecules such as methane and nitrogen. For this reason, among purely organic polymers, BILPs contain some of the most effective networks to date. Nevertheless, they are still outperformed by competitive materials such as metal-organic frameworks (MOFs) or metal doped porous polymers...
August 12, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28802224/speciation-of-the-trivalent-f-elements-eu-iii-and-cm-iii-in-digestive-media
#10
Claudia Wilke, Astrid Barkleit, Thorsten Stumpf, Atsushi Ikeda-Ohno
In case radioactive materials are released into the environment, their incorporation into our digestive system would be a significant concern. Trivalent f-elements, i.e., trivalent actinides and lanthanides, could potentially represent a serious health risk due to their chemo- and radiotoxicity, nevertheless the biochemical behavior of these elements are mostly unknown even to date. This study, therefore, focuses on the chemical speciation of trivalent f-elements in the human gastrointestinal tract. To simulate the digestive system artificial digestive juices (saliva, gastric juice, pancreatic juice and bile fluid) were prepared...
August 4, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28801596/a-synthesis-of-soil-carbon-and-nitrogen-recovery-after-wetland-restoration-and-creation-in-the-united-states
#11
Lingfei Yu, Yao Huang, Feifei Sun, Wenjuan Sun
Wetland restoration and creation efforts have been widely attempted as a way to compensate for wetland losses and to recover wetland functions; however, to date, there has been no comprehensive evaluation of the efficacy of soil carbon (C) and nitrogen (N) content recovery at a regional scale. This meta-analysis synthesizes 48 articles to identify the general patterns of soil C and N change after wetland restoration and creation in the United States. Our results indicate that, after 11-20 years, soil C and N in restored and created wetlands are still significantly lower by 51...
August 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28800106/recent-trends-on-electrochemical-sensors-based-on-ordered-mesoporous-carbon
#12
REVIEW
Alain Walcarius
The past decade has seen an increasing number of extensive studies devoted to the exploitation of ordered mesoporous carbon (OMC) materials in electrochemistry, notably in the fields of energy and sensing. The present review summarizes the recent achievements made in field of electroanalysis using electrodes modified with such nanomaterials. On the basis of comprehensive tables, the interest in OMC for designing electrochemical sensors is illustrated through the various applications developed to date. They include voltammetric detection after preconcentration, electrocatalysis (intrinsically due to OMC or based on suitable catalysts deposited onto OMC), electrochemical biosensors, as well as electrochemiluminescence and potentiometric sensors...
August 11, 2017: Sensors
https://www.readbyqxmd.com/read/28799143/adsorption-studies-on-the-removal-of-cod-and-bod-from-treated-sewage-using-activated-carbon-prepared-from-date-palm-waste
#13
Abd ElAziz A Nayl, Reda A Elkhashab, Tamer El Malah, Sobhy M Yakout, Mohamed A El-Khateeb, Mahmoud M S Ali, Hazim M Ali
In this work, the adsorption of chemical oxygen demand (COD) and biological oxygen demand (BOD) from treated sewage with low-cost activated carbon prepared from date palm shell waste by chemical activation method was studied. Different parameters affecting the adsorption process such as carbon dose, pH, contact time, agitation rate, and temperature were studied. Adsorption equilibrium was attained after 150 min at pH 6.0 with agitation rate of 400 rpm at 25 °C. The results showed that COD removal percentage of 95...
August 10, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28798958/biofunctionalized-conductive-polymers-enable-efficient-co2-electroreduction
#14
Halime Coskun, Abdalaziz Aljabour, Phil De Luna, Dominik Farka, Theresia Greunz, David Stifter, Mahmut Kus, Xueli Zheng, Min Liu, Achim W Hassel, Wolfgang Schöfberger, Edward H Sargent, Niyazi Serdar Sariciftci, Philipp Stadler
Selective electrocatalysts are urgently needed for carbon dioxide (CO2) reduction to replace fossil fuels with renewable fuels, thereby closing the carbon cycle. To date, noble metals have achieved the best performance in energy yield and faradaic efficiency and have recently reached impressive electrical-to-chemical power conversion efficiencies. However, the scarcity of precious metals makes the search for scalable, metal-free, CO2 reduction reaction (CO2RR) catalysts all the more important. We report an all-organic, that is, metal-free, electrocatalyst that achieves impressive performance comparable to that of best-in-class Ag electrocatalysts...
August 2017: Science Advances
https://www.readbyqxmd.com/read/28795456/click-chemistry-in-functional-aliphatic-polycarbonates
#15
REVIEW
Yu Dai, Xiaojin Zhang, Fan Xia
Click chemistry, one of the most important methods in conjugation, plays an extremely significant role in the synthesis of functional aliphatic polycarbonates, which are a group of biodegradable polymers containing carbonate bonds in their main chains. To date, more than 75 articles have been reported on the topic of click chemistry in functional aliphatic polycarbonates. However, these efforts have not yet been highlighted. Six categories of click reactions (alkyne-azide reaction, thiol-ene reaction, Michael addition, epoxy-amine/thiol reaction, Diels-Alder reaction, and imine formation) that have been afforded for further post-polymerization modification of polycarbonates are reviewed...
August 10, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28793810/remote-sensing-tropical-coral-reefs-the-view-from-above
#16
Sam J Purkis
Carbonate precipitation has been a common life strategy for marine organisms for 3.7 billion years, as, therefore, has their construction of reefs. As favored by modern corals, reef-forming organisms have typically adopted a niche in warm, shallow, well-lit, tropical marine waters, where they are capable of building vast carbonate edifices. Because fossil reefs form water aquifers and hydrocarbon reservoirs, considerable effort has been dedicated to understanding their anatomy and morphology. Remote sensing has a particular role to play here...
August 9, 2017: Annual Review of Marine Science
https://www.readbyqxmd.com/read/28791040/rocking-the-boat-damage-to-eelgrass-by-swinging-boat-moorings
#17
Richard K F Unsworth, Beth Williams, Benjamin L Jones, Leanne C Cullen-Unsworth
Seagrass meadows commonly reside in shallow sheltered embayments typical of the locations that provide an attractive option for mooring boats. Given the potential for boat moorings to result in disturbance to the seabed due to repeated physical impact, these moorings may present a significant threat to seagrass meadows. The seagrass Zostera marina (known as eelgrass) is extensive across the northern hemisphere, forming critical fisheries habitat and creating efficient long-term stores of carbon in sediments...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28783118/optimization-of-baker-s-yeast-production-on-date-extract-using-response-surface-methodology-rsm
#18
Mounira Kara Ali, Nawel Outili, Asma Ait Kaki, Radia Cherfia, Sara Benhassine, Akila Benaissa, Noreddine Kacem Chaouche
This work aims to study the production of the biomass of S. cerevisiae on an optimized medium using date extract as the only carbon source in order to obtain a good yield of the biomass. The biomass production was carried out according to the central composite experimental design (CCD) as a response surface methodology using Minitab 16 software. Indeed, under optimal biomass production conditions, temperature (32.9 °C), pH (5.35) and the total reducing sugar extracted from dates (70.93 g/L), S. cerevisiae produced 40 g/L of their biomass in an Erlenmeyer after only 16 h of fermentation...
August 7, 2017: Foods (Basel, Switzerland)
https://www.readbyqxmd.com/read/28777746/characterization-of-breast-calcification-types-using-dual-energy-x-ray-method
#19
Niki Martini, Vaia Koukou, George Fountos, Christos Michail, Athanasios Bakas, Ioannis S Kandarakis, Robert David Speller, George C Nikiforidis
Calcifications are products of mineralization whose presence is usually associated with pathological conditions. The minerals mostly seen in several diseases are calcium oxalate (CaC2O4), calcium carbonate (CaCO3) and hydroxyapatite (HAp). Up to date, there is no in-vivo method that could discriminate between minerals. To this aim, a dual energy X-ray method was developed in the present study. An analytical model was implemented for the determination of the Calcium/Phosphorus mass ratio (mca/mp ). The simulation was carried out using monoenergetic and polyenergetic X-rays and various calcification thicknesses (100 to 1000 um) and types (CaC2O4, CaCO3, HAp)...
August 4, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28774610/organic-chloramines-in-chlorine-based-disinfected-water-systems-a-critical-review
#20
REVIEW
Zuo Tong How, Ina Kristiana, Francesco Busetti, Kathryn L Linge, Cynthia A Joll
This paper is a critical review of current knowledge of organic chloramines in water systems, including their formation, stability, toxicity, analytical methods for detection, and their impact on drinking water treatment and quality. The term organic chloramines may refer to any halogenated organic compounds measured as part of combined chlorine (the difference between the measured free and total chlorine concentrations), and may include N-chloramines, N-chloramino acids, N-chloraldimines and N-chloramides...
August 2017: Journal of Environmental Sciences (China)
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