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https://www.readbyqxmd.com/read/28821082/recycling-of-pre-hydrolysis-liquor-to-improve-the-concentrations-of-hemicellulosic-saccharides-during-water-pre-hydrolysis-of-aspen-woodchips
#1
Zongquan Li, Jungang Jiang, Yingjuan Fu, Zhaojiang Wang, Menghua Qin
In this study, the pre-hydrolysis liquor (PHL) was recycled during aspen chip water pre-hydrolysis, and the effects of PHL recycling on the extraction and accumulation of the hemicellulosic saccharides especially that with high molecular weight in the PHL were studied. The results showed that the concentration of hemicellulose saccharides in PHL depended on the pre-hydrolysis temperature and PHL recycling times. Compared to the unrecycled PHL, the concentration of hemicellulosic saccharides in PHL increased significantly when recycling PHL once or twice at 170°C...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28797628/refuse-derived-fuel-rdf-production-and-gasification-in-a-pilot-plant-integrated-with-an-otto-cycle-ice-through-aspen-plus%C3%A2-modelling-thermodynamic-and-economic-viability
#2
Albany Milena Lozano Násner, Electo Eduardo Silva Lora, José Carlos Escobar Palacio, Mateus Henrique Rocha, Julian Camilo Restrepo, Osvaldo José Venturini, Albert Ratner
This work deals with the development of a Refuse Derived Fuel (RDF) gasification pilot plant using air as a gasification agent. A downdraft fixed bed reactor is integrated with an Otto cycle Internal Combustion Engine (ICE). Modelling was carried out using the Aspen Plus™ software to predict the ideal operational conditions for maximum efficiency. Thermodynamics package used in the simulation comprised the Non-Random Two-Liquid (NRTL) model and the Hayden-O'Connell (HOC) equation of state. As expected, the results indicated that the Equivalence Ratio (ER) has a direct influence over the gasification temperature and the composition of the Raw Produced Gas (RPG), and effects of ER over the Lower Heating Value (LHV) and Cold Gasification Efficiency (CGE) of the RPG are also discussed...
August 7, 2017: Waste Management
https://www.readbyqxmd.com/read/28780454/nicotinamide-antioxidative-and-dna-hypomethylation-effects-in-plant-cells
#3
Torkel Berglund, Anders Wallström, Tuong-Van Nguyen, Cecilia Laurell, Anna B Ohlsson
The effects of nicotinamide (NIC) and its natural plant metabolites nicotinic acid (NIA) and trigonelline (TRIG) were studied with respect to defense in plant cell cultures. NIC and NIA could protect against oxidative stress damage caused by 2,2'-azobis(2-amidinopropane) dihydrochloride (AAPH), which generates free radicals. Damage was analyzed as DNA strand breaks in cell cultures of Pisum sativum (garden pea), Daucus carota (carrot), Populus tremula L. × P. tremuloides (hybrid aspen) and Catharanthus roseus (Madagascar periwinkle), monitored by single cell gel electrophoresis (comet assay), and assays of cell leakage in C...
July 29, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28777916/41st-aspen-president-s-address-advancing-the-science-and-practice-of-nutrition-support-into-the-future
#4
Charlene Compher
No abstract text is available yet for this article.
August 1, 2017: JPEN. Journal of Parenteral and Enteral Nutrition
https://www.readbyqxmd.com/read/28768815/synthesis-and-self-assembly-of-cellulose-microfibrils-from-reconstituted-cellulose-synthase
#5
Sung Hyun Cho, Pallinti Purushotham, Chao Fang, Cassandra Maranas, Sara M Díaz-Moreno, Vincent Bulone, Jochen Zimmer, Manish Kumar, B Tracy Nixon
Cellulose, the major component of plant cell walls, can be converted to bioethanol and is thus highly studied. In plants, cellulose is produced by cellulose synthase, a processive family-2 glycosyltransferase. In plant cell walls, individual β-1,4-glucan chains polymerized by CesA are assembled into microfibrils that are frequently bundled into macrofibrils. An in vitro system in which cellulose is synthesized and assembled into fibrils would facilitate detailed study of this process. Here, we report the heterologous expression and partial purification of His-tagged CesA5 from Physcomitrella patens...
August 2, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28762590/contributions-of-insects-and-droughts-to-growth-decline-of-trembling-aspen-mixed-boreal-forest-of-western-canada
#6
Lei Chen, Jian-Guo Huang, Andria Dawson, Lihong Zhai, Kenneth J Stadt, Philip G Comeau, Caroline Whitehouse
Insects, diseases, fire and drought and other disturbances associated with global climate change contribute to forest decline and mortality in many parts of the world. Forest decline and mortality related to drought or insect outbreaks have been observed in North American aspen forests. However, little research has been done to partition and estimate their relative contributions to growth declines. In this study, we combined tree-ring width and basal area increment series from 40 trembling aspen (Populus tremuloides Michx...
August 1, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28744731/plant-community-chemical-composition-influences-trembling-aspen-populus-tremuloides-intake-by-sheep
#7
Kristen Y Heroy, Samuel B St Clair, Elizabeth A Burritt, Juan J Villalba
Nutrients and plant secondary compounds in aspen (Populus tremuloides) may interact with nutrients in the surrounding vegetation to influence aspen use by herbivores. Thus, this study aimed to determine aspen intake and preference by sheep in response to supplementary nutrients or plant secondary compounds (PSC) present in aspen trees. Thirty-two lambs were randomly assigned to one of four molasses-based supplementary feeds to a basal diet of tall fescue hay (N = 8) during three experiments. The supplements were as follows: (1) high-protein (60% canola meal), (2) a PSC (6% quebracho tannins), (3) 25% aspen bark, and (4) control (100% molasses)...
July 25, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28731841/survey-of-nutrition-management-practices-in-centers-for-pediatric-intestinal-rehabilitation
#8
Anita M Nucci, Kipp Ellsworth, Austin Michalski, Emily Nagel, Jackie Wessel
BACKGROUND: Nutrition management of pediatric intestinal failure (IF) requires interdisciplinary coordination of parenteral nutrition (PN) and enteral nutrition (EN) support. Nutrition strategies used by specialists in pediatric intestinal rehabilitation to promote gut adaptation and manage complications have not been previously summarized. METHODS: A practice survey was distributed to members of the dietitian subgroup of the American Society for Parenteral and Enteral Nutrition Pediatric Intestinal Failure Section...
July 1, 2017: Nutrition in Clinical Practice
https://www.readbyqxmd.com/read/28727958/lipid-injectable-emulsion-survey-with-gap-analysis
#9
Michael L Christensen, Phil Ayers, Joseph I Boullata, Peggi Guenter, Kathleen M Gura, Beverly Holcombe, David S Seres, Gordon S Sacks
BACKGROUND: Lipid injectable emulsion (ILE) is an integral part of parenteral nutrition (PN), providing energy and essential fatty acids. With recent consensus recommendations for PN, clinical guidelines for ordering and preparation of PN, the U.S. Food and Drug Administration approval of new ILE products, and revised ILE labeling to include a 1.2-micron filter, a gap in current practice knowledge was apparent. MATERIALS AND METHODS: The American Society for Parenteral and Enteral Nutrition PN Safety Committee surveyed clinicians on how ILE products are prescribed, prepared, and administered to patients from neonates to adults...
July 1, 2017: Nutrition in Clinical Practice
https://www.readbyqxmd.com/read/28727591/the-effectiveness-of-emla-as-a-primary-dressing-on-painful-chronic-leg-ulcers-a-pilot-randomized-controlled-trial
#10
Anne Purcell, Thomas Buckley, Judith Fethney, Jennie King, Wendy Moyle, Andrea P Marshall
OBJECTIVE: To evaluate the effectiveness of the eutectic mixture of local anesthetics (EMLA; Aspen Pharmacare, St. Leonards, New South Wales, Australia) as a primary dressing on painful chronic leg ulcers. DESIGN: A pilot randomized controlled trial. SETTING: The study was conducted across 6 community nursing procedure clinics located in a community nursing service in New South Wales, Australia. PARTICIPANTS: Sixty participants with painful chronic leg ulcers of varied etiology were recruited into the study...
August 2017: Advances in Skin & Wound Care
https://www.readbyqxmd.com/read/28692414/how-common-is-within-plant-signalling-via-volatiles
#11
Tao Li, James D Blande
Many plants respond to herbivory by releasing a complex blend of volatiles that may differ from that emitted by intact counterparts. These herbivore-induced plant volatiles (HIPV) mediate many interactions among plants and their community members, including alerting undamaged leaves of the attacked or neighbouring plants to impending danger. It has been postulated that HIPVs evolved for within-plant signalling and that other organisms subsequently evolved to use them. However, only seven studies have reported HIPV-mediated within-plant signalling, most conducted in the laboratory or greenhouse...
July 10, 2017: Plant Signaling & Behavior
https://www.readbyqxmd.com/read/28680120/post-glacial-biogeography-of-trembling-aspen-inferred-from-habitat-models-and-genetic-variance-in-quantitative-traits
#12
Chen Ding, Stefan G Schreiber, David R Roberts, Andreas Hamann, Jean S Brouard
Using species distribution models and information on genetic structure and within-population variance observed in a series of common garden trials, we reconstructed a historical biogeography of trembling aspen in North America. We used an ensemble classifier modelling approach (RandomForest) to reconstruct palaeoclimatic habitat for the periods 21,000, 14,000, 11,000 and 6,000 years before present. Genetic structure and diversity in quantitative traits was evaluated in common garden trials with 43 aspen collections ranging from Minnesota to northern British Columbia...
July 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28667282/maintaining-ecosystem-resilience-functional-responses-of-tree-cavity-nesters-to-logging-in-temperate-forests-of-the-americas
#13
José Tomás Ibarra, Michaela Martin, Kristina L Cockle, Kathy Martin
Logging often reduces taxonomic diversity in forest communities, but little is known about how this biodiversity loss affects the resilience of ecosystem functions. We examined how partial logging and clearcutting of temperate forests influenced functional diversity of birds that nest in tree cavities. We used point-counts in a before-after-control-impact design to examine the effects of logging on the value, range, and density of functional traits in bird communities in Canada (21 species) and Chile (16 species)...
June 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28652863/stimulation-and-inhibition-of-enzymatic-hydrolysis-by-organosolv-lignins-as-determined-by-zeta-potential-and-hydrophobicity
#14
Yang Huang, Shaolong Sun, Chen Huang, Qiang Yong, Thomas Elder, Maobing Tu
BACKGROUND: Lignin typically inhibits enzymatic hydrolysis of cellulosic biomass, but certain organosolv lignins or lignosulfonates enhance enzymatic hydrolysis. The hydrophobic and electrostatic interactions between lignin and cellulases play critical roles in the enzymatic hydrolysis process. However, how to incorporate these two interactions into the consideration of lignin effects has not been investigated. RESULTS: We examined the physicochemical properties and the structures of ethanol organosolv lignins (EOL) from hardwood and softwood and ascertained the association between lignin properties and their inhibitory and stimulatory effects on enzymatic hydrolysis...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28647656/delayed-retroclival-and-cervical-spinal-subdural-hematoma-complicated-by-pre-existing-chiari-malformation-in-an-adult-trauma-patient
#15
Ha Nguyen, Hoon Choi, Shekar Kurpad, Hesham Soliman
INTRODUCTION: Traumatic spinal subdural hematoma involving the retroclival region and upper cervical spine is a rare pathology. To our knowledge, there have only been two prior cases in an adult trauma patient. We describe a patient with pre-existing Chiari 1 malformation, who recently sustained a unilateral Type 1 OCF (occipital condyle fracture) with associated disruption of the tectorial membrane and transverse ligament, that returned with a retroclival subdural hematoma extending down to C7, causing spinal cord compression and symptomatic obstructive hydrocephalus...
June 21, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28645173/spatially-resolved-metabolic-analysis-reveals-a-central-role-for-transcriptional-control-in-carbon-allocation-to-wood
#16
Melissa Roach, Stéphanie Arrivault, Amir Mahboubi, Nicole Krohn, Ronan Sulpice, Mark Stitt, Totte Niittylä
The contribution of transcriptional and post-transcriptional regulation to modifying carbon allocation to developing wood of trees is not well defined. To clarify the role of transcriptional regulation, the enzyme activity patterns of eight central primary metabolism enzymes across phloem, cambium, and developing wood of aspen (Populus tremula L.) were compared with transcript levels obtained by RNA sequencing of sequential stem sections from the same trees. Enzymes were selected on the basis of their importance in sugar metabolism and in linking primary metabolism to lignin biosynthesis...
June 22, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28631123/modeling-solubility-of-co2-hydrocarbon-gas-in-ionic-liquid-emim-fap-using-aspen-plus-simulations
#17
Bishwadeep Bagchi, Sushmita Sati, Vidyasagar Shilapuram
The Peng-Robinson equation of state with quadratic van der Waals (vdW) mixing rule model was chosen to perform the thermodynamic calculations in Flash3 column of Aspen Plus to predict the solubility of CO2 or any one of the hydrocarbons (HCs) among methane, ethane, propane, and butane in an ionic liquid 1-ethyl-3-methylimidazolium tris(pentafluoroethyl)trifluorophosphate ([emim][FAP]). Bubble point pressure, solubility, bubble point temperature, fugacity, and partial molar volume at infinite dilution were obtained from the simulations, and enthalpy of absorption, Gibbs free energy of solvation, and entropy change of absorption were estimated by thermodynamic relations...
June 19, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28624948/metal-release-from-contaminated-leaf-litter-and-leachate-toxicity-for-the-freshwater-crustacean-gammarus-fossarum
#18
Florence Maunoury-Danger, Vincent Felten, Clément Bojic, Fabrice Fraysse, Mar Cosin Ponce, Odile Dedourge-Geffard, Alain Geffard, François Guérold, Michael Danger
Industrialization has left large surfaces of contaminated soils, which may act as a source of pollution for contiguous ecosystems, either terrestrial or aquatic. When polluted sites are recolonized by plants, dispersion of leaf litter might represent a non-negligible source of contaminants, especially metals. To evaluate the risks associated to contaminated leaf litter dispersion in aquatic ecosystems, we first measured the dynamics of metal loss from leaf litter during a 48-h experimental leaching. We used aspen (Populus tremula L...
June 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28622737/a-mnemonic-for-pharmacists-to-ensure-optimal-monitoring-and-safety-of-total-parenteral-nutrition-i-am-full
#19
Chris J Bohl, Ann Parks
OBJECTIVE: To present a guideline-derived mnemonic that provides a systematic monitoring process to increase pharmacists' confidence in total parenteral nutrition (TPN) monitoring and improve safety and efficacy of TPN use. DATA SOURCES: The American Society for Parenteral and Enteral Nutrition (ASPEN) guidelines were reviewed. Additional resources included a literature search of PubMed (1980 to May 2016) using the search terms: total parenteral nutrition, mnemonic, indications, allergy, macronutrients, micronutrients, fluid, comorbidities, labs, peripheral line, and central line...
July 2017: Annals of Pharmacotherapy
https://www.readbyqxmd.com/read/28595513/modeling-and-comparative-assessment-of-bubbling-fluidized-bed-gasification-system-for-syngas-production-a-gateway-for-a-cleaner-future-in-pakistan
#20
Areeb Shehzad, Mohammed J K Bashir, Mika Horttanainen, Mika Manttari, Jouni Havukainen, Ghulam Abbas
The present study explores the potential of MSW gasification for exergy analysis and has been recently given a premier attention in a region like Pakistan where the urbanization is rapidly growing and resources are few. The plant capacity was set at 50 MW based on reference data available and the total exergetic efficiency was recorded to be 31.5 MW. The largest irreversibility distribution appears in the gasifier followed by methanation unit and CO2 capture. The effect of process temperature, equivalence ratio and MSW moisture content was explored for inspecting the variations in syngas composition, lower heating value, carbon conversion efficiency and cold gas efficiency...
June 19, 2017: Environmental Technology
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