نتایج جستجو برای: 6 bishydroxymethyl phenols

تعداد نتایج: 965939  

2013
Xueyong Ren Jinsheng Gou Wenliang Wang Qiang Li Jianmin Chang Ben Li

Bark is one of the most under-utilized types of lignocellulosic biomass in the forest industry. In this study, bark fast pyrolysis was optimized for phenols yield using response surface methodology (RSM), considering the pyrolysis temperature, gas flow rate, and biomass particle size. The bio-oil generated under optimal conditions was then characterized by gas chromatography-mass spectrometry (...

Journal: :Diseases of aquatic organisms 2016
Maya L Groner Colleen A Burge Catherine J S Kim Erin Rees Kathryn L Van Alstyne Sylvia Yang Sandy Wyllie-Echeverria C Drew Harvell

Seagrasses are ecosystem engineers of essential marine habitat. Their populations are rapidly declining worldwide. One potential cause of seagrass population declines is wasting disease, which is caused by opportunistic pathogens in the genus Labyrinthula. While infection with these pathogens is common in seagrasses, theory suggests that disease only occurs when environmental stressors cause im...

Journal: :international journal of environmental research 2010
h. liu j. tan h.x. yu h.x. liu l.s. wang

although extensive experimental work has been carried out during the last several years, experimental reaction rate constants are available only for hundreds of compounds. therefore, it is useful to develop a theoretical prediction method, which can be used to obtain estimates of the necessary kinetic parameters. one of the most successful approaches to predict chemical properties starting only...

Journal: :iranian journal of catalysis 2014
shahnaz rostamizadeh negar zekri

3-methyl-1-(4-sulfobuthyl)-1-h-imidazol-3ium hydrogen sulfate, as a dual acidic ionic liquid (dail), was found to be an efficient catalyst for the simple, rapid and green synthesis of substituted trisphenols from the condensation of different substituted phenols and 2,6-bis (methylol) phenols (bmp). dail catalyst efficiently promoted the reaction between phenols and bmps with a variety of funct...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 1997
habib firouzabadi nasser iranpoor mohammad ali zolfigol

nitration of phenol and various 4-substituted phenols with cu(no3)2.3h2o, cu(no3)2.3h2o/sio2, 9h2o and cr(no3)2. 9h2o in different anhydrous organic solvents are investigated. high selectivity ratio of para vs ortho isomers has been observed. mono- and dinitro compounds from phenol and 4-substituted phenols by choosing the proper solvents and reaction conditions, are also obtained with high sel...

2008
MICHAEL K. SOFONIOU

Total phenols were determined by molecular spectmphotometry, after distillation, complexation with Caminoantipyrine and extraction into chloroform. Cyanides were also determined spectrophotometrically after distillation from the acidified samples, and complexation in moderate acidic solution with barbituric acid. The dynamic ranges were 0 100 pg L-' for total phenols and 0 30 pg L-' for cyanide...

2017
Qian Wu Dingyuan Yan Ying Chen Ting Wang Feng Xiong Wei Wei Yi Lu Wei-Yin Sun Jie Jack Li Jing Zhao

Ubiquitous tyrosinase catalyses the aerobic oxidation of phenols to catechols through the binuclear copper centres. Here, inspired by the Fischer indole synthesis, we report an iridium-catalysed tyrosinase-like approach to catechols, employing an oxyacetamide-directed C-H hydroxylation on phenols. This method achieves one-step, redox-neutral synthesis of catechols with diverse substituent group...

Journal: :Biomedical and environmental sciences : BES 2005
Xing Yuan Guang-Hua Lu Li-Min Su

OBJECTIVE To study the correlation of toxicity with biodegradability (BODT) in order to promote QSBR development and understand the degradation mechanism. METHODS Toxicity of substituted phenols to river bacteria was determined by the turbidities that were measured using a spectrophotometer (UV-190) at 530 nm against a blank control. The biodegradability of substituted phenols was expressed a...

2006
Go Inoue Feifei Su Satoshi Takada Katsumi Honda Yusuke Shimoyama Yoshio Iwai Yasuhiko Arai

The distribution coefficients for phenols (phenol, o-cresol, m-cresol, p-cresol, 3,5-xylenol and α-naphthol) in ionic liquid (1-butyl-3-methylimidazolium haxafluorophosphate ([bmim][PF6]))/water two-phase system were measured at 298 K to examine a removal ability of phenols in wastewater by the liquid-liquid extraction. Judging from these distribution coefficients, it is feasible that phenols c...

2013
Alaa A. Gaafar Zeinab A. Salama

Cynara scolymus L. is a medicinal plant frequently used in traditional medicine for liver diseases. The aim of this study is to evaluate the antimicrobial activity of the different parts of Artichoke. Maximum antimicrobial activity was observed with methanolic extract of bound phenols for (bract and heart) against Gram negative bacteria. The MIC values for bound phenols from heart were (63μg/ml...

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