Results 1 to 10 of about 548,341 (164)

MINERALOGY OF THE VORONTSOVSKOE GOLD DEPOSIT (NORTHERN URALS). PART 4: OXYSALTS [PDF]

Минералогия, 2021
This is a final paper in a series of publications devoted to the mineralogy of the Vorontsovskoe gold deposit in the Northern Urals. The article reports on oxygen compounds (oxyhalides, oxides, hydroxides, carbonates, sulfates, tungstates, phosphates ...
A.V. Kasatkin, S.Yu. Stepanov, M.V. Tsyganko, R. Škoda, F. Nestola, J. Plášil, E. Makovicky, A.A. Agakhanov, R.S. Palamarchuk   +8 more
doaj   +1 more source

Synthesis and characterization of oxygen-containing imidazo[1,2-d][1,2,4]oxadiazole fused-ring energetic compounds

Energetic Materials Frontiers, 2022
Oxygen plays an important role in improving the oxygen balances and densities of energetic compounds. In this study, a series of oxygen-containing imidazo[1,2-d][1,2,4]oxadiazole building block-based energetic compounds (3–8) were synthesized and fully ...
Hui Dou, Peng Chen, Chun-lin He, Si-ping Pang   +3 more
doaj   +1 more source

1,4,6,10-Tetraazaadamantanes (TAADs) with N-amino groups: synthesis and formation of boron chelates and host–guest complexes

Beilstein Journal of Organic Chemistry, 2022
A synthetic route to 1,4,6,10-tetraazaadamantanes (TAADs) bearing free and protected amino groups at the bridge N-atoms has been developed via intramolecular cyclotrimerization of C=N units in the corresponding tris(hydrazonoalkyl)amines.
Artem N. Semakin, Ivan S. Golovanov, Yulia V. Nelyubina, Alexey Yu. Sukhorukov   +3 more
doaj   +1 more source

Metabolomic fingerprinting based on network analysis of volatile aroma compounds during the forced aging of Huangjiu: Effects of dissolved oxygen and temperature

Frontiers in Nutrition, 2023
IntroductionHuangjiu is an important Chinese alcoholic beverage, usually prepared from rice. Although its unique flavor improves with prolonged storage in traditional pottery jars, knowledge of the aging mechanism, necessary for commercialization of an ...
Na Wang, Lili Zhang, Xuejiao Ren, Shuang Chen, Zhen Zhang   +4 more
doaj   +1 more source

ANALYSIS AND IDENTIFICATION OF OXYGEN COMPOUNDS IN LONGKOU SHALE OIL AND SHENMU COAL TAR; pp. 322–333 [PDF]

Oil Shale, 2012
Methods of acid-base separation and extrography were used to decompose shale oil of Longkou oil shale (LSO), Shandong province, and coal tar of Shenmu coal (SCT), Shanxi province, both China, into acid, base and neutral fractions. The molecular structure
CENGCENG GENG, SHUYUAN LI, YUE MA, CHANGTAO YUE, JILAI HE, Wenzhi Shang   +5 more
doaj   +1 more source

First-principles study of the morphology and surface structure of LaCoO3 and La0.5Sr0.5Fe0.5Co0.5O3 perovskites as air electrodes for solid oxide fuel cells

Science and Technology of Advanced Materials: Methods, 2021
The slow kinetics of the oxygen exchange reaction at the surface of air electrodes for solid oxide fuel cells must be improved to reduce their operating temperature.
Masanobu Nakayama, Katsuya Nishii, Kentaro Watanabe, Naoto Tanibata, Hayami Takeda, Takanori Itoh, Toru Asaka   +6 more
doaj   +1 more source

Effect of Oxygen Concentration in Fermentation on Black Tea Quality and Optimization of Oxygen-enriched Fermentation Process

Shipin gongye ke-ji, 2023
Fermentation is a critical process of black tea quality formation and oxygen is the key factor affecting the fermentation, so it is important to analyze the effect of oxygen in fermentation on the quality and metabolites of black tea.
Yunfei YANG, Yuwan WANG, Jiazheng LIN, Zheng TU, Tianmeng LAN, Lin CHEN, Yang YE   +6 more
doaj   +1 more source

The Relationship Between Salivary Redox, Diet, and Food Flavor Perception

Frontiers in Nutrition, 2021
The mouth is the gateway for entrance of food and microorganisms into the organism. The oral cavity is bathed by saliva, which is thus the first fluid that food and microorganisms will face after their entrance.
Mathieu Schwartz, Fabrice Neiers, Gilles Feron, Francis Canon   +3 more
doaj   +1 more source

Tumor Hypoxia Imaging Agents in Nuclear Medicine

Trends in Peptide and Protein Sciences, 2017
Hypoxia is due to imbalance in oxygen supply and oxygen demand compromising biological functions of cells. Since tumor hypoxia results in angiogenesis, apoptosis, metastasis, tumor aggressiveness and treatment failure, in vivo measurement is required ...
Mahtab Mohammadpour, Soraya Shahhosseini
doaj   +1 more source

Vinyl Polymerization by Organoboron Compounds.-Cocatalytic Action of Oxygen and Oxygen Compounds

The Journal of the Society of Chemical Industry, Japan, 1958
トリアルキルホウ素は,ビニル化合物をよく重合させるが,このとき,ビニル基が電気的に,より正になっているような化合物ほど重合速度が大きい。また,トリアルキルホウ素触媒重合においては,酸素あるいは酸素化合物が顕著な助触媒作用をもっていることがわかった。なお,トリアルキルホウ素以外の各種の有機ホウ素化合物を別に合成し,これらの重合触媒能をしらべた結果,触媒活性はホウ素原子上の電子密度の大きさとだいたい平行的であるらしいという結論に達した。しかし,この重合の反応機構については未解の点が多く,なお詳細な研究を必要とする段階にある。
Junji Furukawa, Teiji Tsuruta, Akira Onishi, Takeo Saegusa, Takayuki Fueno, Hideo Fukutani, Takanobu Imada   +6 more
openaire   +2 more sources