نتایج جستجو برای: روش DFRC.

تعداد نتایج: 369623  

2008
Anderson Guerra Marcela Norambuena Juanita Freer Dimitris S. Argyropoulos

Enzymatic mild acidolysis lignins (EMAL) isolated from different species of softwood and Eucalyptus globulus were submitted to comparative analysis that included thioacidolysis, derivatization followed by reductive cleavage (DFRC), and DFRC followed by quantitative 31P NMR (DFRC/31P NMR). While gas chromatography (GC) was used to determine the monomer yields from both thioacidolysis and DFRC, 3...

Journal: :Journal of natural products 2008
Anderson Guerra Marcela Norambuena Juanita Freer Dimitris S Argyropoulos

Enzymatic mild acidolysis lignins (EMAL) isolated from different species of softwood and Eucalyptus globulus were submitted to comparative analysis that included thioacidolysis, derivatization followed by reductive cleavage (DFRC), and DFRC followed by quantitative (31)P NMR (DFRC/(31)P NMR). While gas chromatography (GC) was used to determine the monomer yields from both thioacidolysis and DFR...

Journal: :Computer methods and programs in biomedicine 2011
Ashwath Sundaresan J. Geoffrey Chase Christopher E. Hann Geoffrey M. Shaw

BACKGROUND Acute Respiratory Distress Syndrome (ARDS) results in collapse of alveolar units and loss of lung volume at the end of expiration. Mechanical ventilation is used to treat patients with ARDS or Acute Lung Injury (ALI), with the end objective being to increase the dynamic functional residual capacity (dFRC), and thus increasing overall functional residual capacity (FRC). Simple methods...

Journal: :Journal of agricultural and food chemistry 2012
José C del Río Jorge Rencoret Pepijn Prinsen Ángel T Martínez John Ralph Ana Gutiérrez

The structure of the lignin in wheat straw has been investigated by a combination of analytical pyrolysis, 2D-NMR, and derivatization followed by reductive cleavage (DFRC). It is a p-hydroxyphenyl-guaiacyl-syringyl lignin (with an H:G:S ratio of 6:64:30) associated with p-coumarates and ferulates. 2D-NMR indicated that the main substructures present are β-O-4'-ethers (∼~75%), followed by phenyl...

2013
Erwin J van Drunen J Geoffrey Chase Yeong Shiong Chiew Geoffrey M Shaw Thomas Desaive

BACKGROUND Acute Respiratory Distress Syndrome (ARDS) is characterized by inflammation, filling of the lung with fluid and the collapse of lung units. Mechanical ventilation (MV) is used to treat ARDS using positive end expiratory pressure (PEEP) to recruit and retain lung units, thus increasing pulmonary volume and dynamic functional residual capacity (dFRC) at the end of expiration. However, ...

Journal: :IEEE Aerospace and Electronic Systems Magazine 2022

Enabled by the advancement in radio frequency technologies, convergence of radar and communication systems becomes increasingly promising is envisioned as a key feature future sixth-generation networks. Recently, frequency-hopping (FH) MIMO has been introduced to underlay dual-function radar-communication (DFRC) systems. Superior many previous radar-centric DFRC designs, symbol rate FH-MIMO rad...

Journal: :IEEE Communications Letters 2021

In Part I of this three-part tutorial on dual-functional radar-communication (DFRC), we overviewed the fundamental elements DFRC. As II tutorial, letter overviews state-of-the-art (SoA) in DFRC, with a particular emphasis use technique for seamless connectivity vehicular network. We commence by introducing conventional beam tracking approaches millimeter wave (mmWave) communication systems, bas...

Journal: :Applied and environmental microbiology 2004
Anderson Guerra Régis Mendonça André Ferraz Fachuang Lu John Ralph

Pinus taeda wood chips were biotreated with Ceriporiopsis subvermispora under solid-state fermentation for periods varying from 15 to 90 days. Milled wood lignins extracted from sound and biotreated wood samples were characterized by wet-chemical and spectroscopic techniques. Treatment of the lignins by derivatization followed by reductive cleavage (DFRC) made it possible to detect DFRC monomer...

Journal: :Journal of agricultural and food chemistry 2002
Dimitris S Argyropoulos Lubo Jurasek Lívia Kristofová Zhicheng Xia Yujun Sun Ernest Palus

To define the abundance and comprehend the reactivity of dibenzodioxocins in lignin, model compound studies, specific degradation experiments on milled wood lignin, and molecular modeling calculations have been performed. Quantitative (31)P NMR measurements of the increase of biphenolic hydroxyl groups formed after a series of alkaline degradations in the presence of hydrosulfide anions (kraft ...

Journal: :Journal of agricultural and food chemistry 2015
Jorge Rencoret Pepijn Prinsen Ana Gutiérrez Ángel T Martínez José C Del Río

The structure of the lignin from brewer's spent grain (BSG) has been studied in detail. Three different lignin preparations, the so-called "milled-wood" lignin (MWL), dioxane lignin (DL), and cellulolytic lignin (CEL), were isolated from BSG and then thoroughly characterized by pyrolysis GC/MS, 2D-NMR, and derivatization followed by reductive cleavage (DFRC). The data indicated that BSG lignin ...

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