Results 31 to 40 of about 97,415 (180)

Possible contribution of olefins and heteroatoms to the Unidentified Infrared Bands [PDF]

Astron.Astrophys.402:L13-L16,2003, 2003
The current assignments of the 11.3 feature are shown to be incompatible with observations. An unbiased survey of correlation charts suggests that the olefinic group R2=CH2 is a good alternative candidate. For the 12.7 feature, the best fits are provided by nitrites, R-O-N=O, and amines, R-N=H2.
arxiv   +1 more source

Expedient Access to 18F‐Fluoroheteroarenes via Deaminative Radiofluorination of Aniline‐Derived Pyridinium Salts

Angewandte Chemie, Volume 136, Issue 26, June 21, 2024.
18F‐Fluoroheteroarenes find wide application as radiotracers for PET (positron emission tomography) imaging. Here, we present a deaminative radiosynthetic approach via pyridinium tetrafluoroborates that facilitates radiofluorination of 33 structurally diverse heteroarenes in up to 98 % RCY (radiochemical yield).
Joseph Ford, Sebastiano Ortalli, Zijun Chen, Jeroen B. I. Sap, Matthew Tredwell, Véronique Gouverneur   +5 more
wiley   +2 more sources

Synthesis of 6-(Phenanthrene-3-yl)-2,3-dihydro-1,2,4,-triazine-3-thione as a New Reagent for the Non-Extractive Spectrophotometric Determination of Cu(II) [PDF]

Iranian Journal of Chemistry & Chemical Engineering, 2018
A simple, sensitive, and non-extractive spectrophotometric method was developed for the determination of copper (II) using a newly synthesized chromogenic reagent, 6-(phenanthrene-3-yl)-1,2,4,-triazine-3-thione(PhDTT), in Tween 80 neutral surfactant.
Marzieh Maskoot, Maliheh Barazandeh Tehrani, Mahdyeh Asaee, Effat Souri   +3 more
doaj  

Amyl nitrite inhalation, a “volatile” anemia

American journal of hematology/oncology, 2016
A 41 year-old Caucasian man was referred to hematology consultation due to iterative episodes (for several weeks) of regenerative anemia associated with asthenia, dyspnea, and diarrhea, but without bacteriological documentation.
Lauriane Filliatre, J. Broséus, S. Pissard, C. Mekki, P. Feugier, J. Perrin   +5 more
semanticscholar   +1 more source

Assessing Popper Purity—Implications for the Regulation and Recreational Use of Alkyl Nitrites

Psychoactives
Alkyl nitrites (“poppers”) are a diverse class of volatile chemical compounds with a varied legal and medical history. Though once commonly prescribed to treat angina, popper use is now almost exclusively recreational.
Nathan S. Makarewicz, Brent G. Albertson, Twan Sia, Anuj Aggarwal   +3 more
doaj   +1 more source

Nanoelectrodes for intracellular measurements of reactive oxygen and nitrogen species in single living cells [PDF]

Current Opinion in Electrochemistry, Elsevier, 2020, 22, pp.44-50, 2020
Reactive oxygen and nitrogen species (ROS and RNS) play important roles in various physiological processes (e.g., phagocytosis) and pathological conditions (e.g., cancer). The primary ROS/RNS, viz., hydrogen peroxide, peroxynitrite ion, nitric oxide, and nitrite ion, can be oxidized at different electrode potentials and therefore detected and ...
arxiv   +1 more source

H2FPEF and HFA‐PEFF scores for heart failure risk stratification in hypertrophic cardiomyopathy patients

ESC Heart Failure, EarlyView.
Abstract Aims H2FPEF and HFA‐PEFF scores have demonstrated prognostic value in heart failure (HF) with preserved ejection fraction. This study aimed to explore the value of the H2FPEF and HFA‐PEFF scores for HF risk stratification in patients with hypertrophic cardiomyopathy (HCM).
Yi‐Peng Gao, Hong‐Yun Liu, Xiao‐Jun Bi, Jie Sun, Ying Zhu, Wei Zhou, Ya‐Ting Fan, Xue‐Qing Cheng, Pei‐Na Huang, Ya‐Ni Liu, You‐Bin Deng   +10 more
wiley   +1 more source

Dinitroacetylene: Can It be Made?

Propellants, Explosives, Pyrotechnics, Volume 50, Issue 4, April 2025.
With a predicted record‐high heat of formation, energy density, and outstanding performance as a rocket propellant, dinitroacetylene stretches the imagination for what is possible in terms of organic chemical explosives and monopropellants. In this study, we employ quantum chemical methods to assess the isolability and kinetic stability of this ...
Lara Harter, Guillaume Bélanger‐Chabot, Martin Rahm   +2 more
wiley   +1 more source

Diels‐Alder Reactivity of Triisopropylsilyl Ethynyl Substituted Acenes

Chemistry – A European Journal, Volume 31, Issue 2, January 9, 2025.
The Diels‐Alder reaction of TIPS‐Pen as diene with a number of different dienophiles was examined – the Diels‐Alder reactivity of TIPS‐Pen has not been investigated yet. The lateral size of the dienophile and the dispersion interaction between dienophile and diene are responsible for the unusual regioselectivity of cyclohexene‐based dienophiles with ...
Fabian Jester, Tobias Kaczun, Steffen Maier, Paul Meiners, Svenja Weigold, Frank Rominger, Andreas Dreuw, Jan Freudenberg, Uwe H. F. Bunz   +8 more
wiley   +1 more source

Study on Bacterial Community Changes and Volatile Flavor Correlation During Fermentation of Low‐Salt Dry‐Cured Ham

Journal of Food Biochemistry, Volume 2025, Issue 1, 2025.
The aim of this work is to elucidate the effects of reduced salt content on the microbial ecology and flavor profile of dry‐cured ham. To develop the low‐salt (LS) treatment group, a curing mixture consisting of 18% potassium lactate, 12% lysine, and 70% sodium chloride was utilized instead of traditional curing salts.
Yijia Sun, Xin Liu, Jingqi Cao, Yingdao Nan, Baide Mu, Guanhao Li, Tingyu Li, Chunxiang Piao, Yong-Quan Xu   +8 more
wiley   +1 more source