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Article ; Online: K

Gu, Jian-Guo / Wang, Cai-Xia / Hu, Guang-Qi / Shen, Kang / Zhang, Hong-Hai

Organic letters

2023 Volume 25, Issue 17, Page(s) 3055–3059

Abstract: ... The ... ...

Abstract	The K
Language	English
Publishing date	2023-04-26
Publishing country	United States
Document type	Journal Article
ISSN	1523-7052
ISSN (online)	1523-7052
DOI	10.1021/acs.orglett.3c00883
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Article ; Online: Synthesis of β-Deuterated Amino Acids via Palladium-Catalyzed H/D Exchange.

Sheng, Fei-Fei / Gu, Jian-Guo / Liu, Kai-Hui / Zhang, Hong-Hai

The Journal of organic chemistry

2022 Volume 87, Issue 23, Page(s) 16084–16089

Abstract: Despite several synthetic approaches that have been developed for α-deuterated amino acids, the synthesis of β-deuterated amino acids has remained a challenge. Herein, we disclose a palladium catalyzed H/D exchange protocol for a β-deuterated N-protected ...

Abstract	Despite several synthetic approaches that have been developed for α-deuterated amino acids, the synthesis of β-deuterated amino acids has remained a challenge. Herein, we disclose a palladium catalyzed H/D exchange protocol for a β-deuterated N-protected amino amide, which can be converted to a β-deuterated amino acid simply by removal of protecting groups. This protocol is highly efficient, simply manipulated, and appliable for deuterium-labeling of many amino amides. In addition, deuterium labeling of phenylalanine derivatives was also successful when pivalic acid served as an additive to promote the H/D exchange process.
MeSH term(s)	Palladium ; Amino Acids ; Deuterium ; Amides ; Catalysis
Chemical Substances	Palladium (5TWQ1V240M) ; Amino Acids ; Deuterium (AR09D82C7G) ; Amides
Language	English
Publishing date	2022-11-17
Publishing country	United States
Document type	Journal Article
ZDB-ID	123490-0
ISSN	1520-6904 ; 0022-3263
ISSN (online)	1520-6904
ISSN	0022-3263
DOI	10.1021/acs.joc.2c01654
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Article ; Online: Revealing the Marine Cycles of Volatile Sulfur Compounds and Their Biogeochemical Controls: A Case of the Western North Pacific.

Xu, Feng / Zhang, Hong-Hai / Zhong, Xiao-Song / Yan, Shi-Bo / Zhang, Jia-Wei / Yang, Gui-Peng / Ma, Xin / Chen, Zhao-Hui

Environmental science & technology

2024

Abstract: Volatile sulfur compounds, such as dimethyl sulfide (DMS), carbonyl sulfide (OCS), and carbon disulfide ( ... ...

Abstract	Volatile sulfur compounds, such as dimethyl sulfide (DMS), carbonyl sulfide (OCS), and carbon disulfide (CS
Language	English
Publishing date	2024-02-12
Publishing country	United States
Document type	Journal Article
ISSN	1520-5851
ISSN (online)	1520-5851
DOI	10.1021/acs.est.3c07498
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Article ; Online: Synthesis of Perdeuterated Alkyl Amines/Amides with Pt/C as Catalyst under Mild Conditions.

Zhang, Hong-Hai / Chen, Meng-Zhe / Yu, Xinbin / Bonnesen, Peter V / Wu, Zili / Chen, Hsin-Lung / O'Neill, Hugh

The Journal of organic chemistry

2024

Abstract: A convenient method for the synthesis of perdeuterated alkyl amides/amines is disclosed. Perdeuterated acetyl amides can be achieved by a hydrogen-deuterium (H/D) exchange protocol with Pt/C as a catalyst and ... ...

Abstract	A convenient method for the synthesis of perdeuterated alkyl amides/amines is disclosed. Perdeuterated acetyl amides can be achieved by a hydrogen-deuterium (H/D) exchange protocol with Pt/C as a catalyst and D
Language	English
Publishing date	2024-05-13
Publishing country	United States
Document type	Journal Article
ZDB-ID	123490-0
ISSN	1520-6904 ; 0022-3263
ISSN (online)	1520-6904
ISSN	0022-3263
DOI	10.1021/acs.joc.4c00553
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Article ; Online: Biogeochemical controls on climatically active gases and atmospheric sulfate aerosols in the western Pacific

Xu, Feng / Zhang, Hong-Hai / Yan, Shi-Bo / Sun, Ming-Xin / Wu, Jin-Wei / Yang, Gui-Peng

Environmental Research. 2023 Mar., v. 220 p.115211-

2023

Abstract: The Pacific Ocean plays an important role in regulating the budget of climatically active gases and the burden of sulfate aerosols. Here, a field investigation was conducted to clarify the key processes and factors controlling climatically active gases, ... ...

Abstract	The Pacific Ocean plays an important role in regulating the budget of climatically active gases and the burden of sulfate aerosols. Here, a field investigation was conducted to clarify the key processes and factors controlling climatically active gases, including dimethyl sulfide (DMS), carbonyl sulfide (OCS), carbon disulfide (CS₂), and carbon dioxide (CO₂), in both surface seawater and the lower atmosphere of the western Pacific. In addition, the relative contributions of different sources to atmospheric sulfate aerosols were quantitatively estimated, and their causes were explored. The maximum concentrations of DMS, OCS and CS₂ and the minimum partial pressure of CO₂ (pCO₂) were observed in the Kuroshio-Oyashio Extension. Kuroshio-induced mesoscale eddies brought abundant nutrients and organic matter from the subsurface layer of Oyashio into the euphotic layer, thus enhancing primary productivity and accelerating the photoreaction of organic matter. These processes led to higher concentrations of DMS, OCS and CS₂ and lower pCO₂. However, the oligotrophic subsurface layer in the subtropical gyre and the strong barrier layer in the equatorial waters suppressed the upward fluxes of nutrients and organic matter, resulting in lower surface concentrations of DMS, OCS, and CS₂ in these areas. Being far from the continents, atmospheric concentrations of DMS, OCS and CS₂ and pCO₂ in the western Pacific generally were observed to depend on the local sea-to-air exchange and may be regulated by atmospheric oxidation and mixing of air masses. In general, oceanic DMS emissions played an important role in the formation of sulfate aerosols in the western Pacific (accounting for ∼19.5% of total sulfate aerosols), especially in the Kuroshio-Oyashio Extension (∼32.3%). These processes in seawater may also determine the variations and emissions of other climatically active gases from biogenic and photochemical sources.
Keywords	air ; carbon dioxide ; carbon disulfide ; carbonyl sulfide ; dimethyl sulfide ; organic matter ; oxidation ; partial pressure ; photochemical reactions ; primary productivity ; research ; seawater ; sulfates ; Pacific Ocean ; Atmospheric sulfate aerosols ; Western pacific
Language	English
Dates of publication	2023-03
Publishing place	Elsevier Inc.
Document type	Article ; Online
ZDB-ID	205699-9
ISSN	1096-0953 ; 0013-9351
ISSN (online)	1096-0953
ISSN	0013-9351
DOI	10.1016/j.envres.2023.115211
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Article ; Online: The role of monoaminergic neurons in modulating respiration during sleep and the connection with SUDEP.

Gu, LeYuan / Yu, Qian / Shen, Yue / Wang, YuLing / Xu, Qing / Zhang, HongHai

Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie

2022 Volume 150, Page(s) 112983

Abstract: Sudden unexpected death in epilepsy (SUDEP) is the leading cause of death among epilepsy patients, occurring even more frequently in cases with anti-epileptic drug resistance. Despite some advancements in characterizing SUDEP, the underlying mechanism ... ...

Abstract	Sudden unexpected death in epilepsy (SUDEP) is the leading cause of death among epilepsy patients, occurring even more frequently in cases with anti-epileptic drug resistance. Despite some advancements in characterizing SUDEP, the underlying mechanism remains incompletely understood. This review summarizes the latest advances in our understanding of the pathogenic mechanisms of SUDEP, in order to identify possible targets for the development of new strategies to prevent SUDEP. Based on our previous research along with the current literature, we focus on the role of sleep-disordered breathing (SDB) and its related neural mechanisms to consider the possible roles of monoaminergic neurons in the modulation of respiration during sleep and the occurrence of SUDEP. Overall, this review suggests that targeting the monoaminergic neurons is a promising approach to preventing SUDEP. The proposed roles of SDB and related monoaminergic neural mechanisms in SUDEP provide new insights for explaining the pathogenesis of SUDEP.
MeSH term(s)	Death, Sudden/epidemiology ; Death, Sudden/etiology ; Death, Sudden/prevention & control ; Epilepsy/complications ; Humans ; Neurons ; Respiration ; Risk Factors ; Sleep/physiology ; Sudden Unexpected Death in Epilepsy
Language	English
Publishing date	2022-04-19
Publishing country	France
Document type	Journal Article ; Review
ZDB-ID	392415-4
ISSN	1950-6007 ; 0753-3322 ; 0300-0893
ISSN (online)	1950-6007
ISSN	0753-3322 ; 0300-0893
DOI	10.1016/j.biopha.2022.112983
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Article ; Online: Biogeochemical controls on climatically active gases and atmospheric sulfate aerosols in the western Pacific.

Xu, Feng / Zhang, Hong-Hai / Yan, Shi-Bo / Sun, Ming-Xin / Wu, Jin-Wei / Yang, Gui-Peng

Environmental research

2023 Volume 220, Page(s) 115211

Abstract	The Pacific Ocean plays an important role in regulating the budget of climatically active gases and the burden of sulfate aerosols. Here, a field investigation was conducted to clarify the key processes and factors controlling climatically active gases, including dimethyl sulfide (DMS), carbonyl sulfide (OCS), carbon disulfide (CS
MeSH term(s)	Gases ; Carbon Dioxide ; Sulfates ; Pacific Ocean ; Aerosols
Chemical Substances	Gases ; Carbon Dioxide (142M471B3J) ; Sulfates ; dimethyl sulfide (QS3J7O7L3U) ; Aerosols
Language	English
Publishing date	2023-01-02
Publishing country	Netherlands
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	205699-9
ISSN	1096-0953 ; 0013-9351
ISSN (online)	1096-0953
ISSN	0013-9351
DOI	10.1016/j.envres.2023.115211
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Article ; Online: Characteristics and emissions of isoprene and other non-methane hydrocarbons in the Northwest Pacific Ocean and responses to atmospheric aerosol deposition.

Wu, Ying-Cui / Gao, Xu-Xu / Zhang, Hong-Hai / Liu, Yong-Zheng / Wang, Jian / Xu, Feng / Zhang, Gui-Ling / Chen, Zhao-Hui

The Science of the total environment

2023 Volume 876, Page(s) 162808

Abstract: Field investigations in the Northwest Pacific Ocean were carried out to determine the distributions of marine and atmospheric non-methane hydrocarbons (NMHCs), sources and environmental effects. We also conducted deck incubation experiments to ... ...

Abstract	Field investigations in the Northwest Pacific Ocean were carried out to determine the distributions of marine and atmospheric non-methane hydrocarbons (NMHCs), sources and environmental effects. We also conducted deck incubation experiments to investigate the effects of atmospheric aerosol deposition on NMHCs production. The marine NMHCs displayed an increasing trend from the South Equatorial Current to the Oyashio Current. The enhanced phytoplankton biomass and dissolved organic materials (DOM) content in the Kuroshio-Oyashio Extension contributed significantly to isoprene and NMHCs production compared with those in tropical waters and the North Pacific subtropical gyre. The Northwest Pacific Ocean was a significant source of atmospheric NMHCs, with average sea-to-air fluxes of 28.0 ± 38.9, 65.2 ± 73.3, 21.0 ± 26.7, 48.7 ± 62.6, 12.7 ± 15.9, 14.2 ± 16.8, and 41.7 ± 80.4 nmol m
Language	English
Publishing date	2023-03-14
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	121506-1
ISSN	1879-1026 ; 0048-9697
ISSN (online)	1879-1026
ISSN	0048-9697
DOI	10.1016/j.scitotenv.2023.162808
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Article ; Online: Contrasting effects of different light regimes on the photoreactivities of allochthonous and autochthonous chromophoric dissolved organic matter.

Zhu, Wen-Zhuo / Wang, Shu-Heng / Wang, De-Zhong / Feng, Wei-Hua / Li, Bo / Zhang, Hong-Hai

Chemosphere

2023 Volume 332, Page(s) 138823

Abstract: Chromophoric dissolved organic matter (CDOM) plays an important role in ultraviolet (UV) light absorption in the ocean. CDOM is known to originate from either an allochthonous or autochthonous source and has varying compositions and levels of reactivity; ...

Abstract	Chromophoric dissolved organic matter (CDOM) plays an important role in ultraviolet (UV) light absorption in the ocean. CDOM is known to originate from either an allochthonous or autochthonous source and has varying compositions and levels of reactivity; however, the effects of individual radiation treatments and the combined effects of UVA and UVB on allochthonous and autochthonous CDOM remain poorly understood. Thus, here, we measured changes in the common optical properties of CDOM collected from China's marginal seas and the Northwest Pacific, using full-spectrum, UVA (315-400 nm), and UVB (280-315 nm) irradiation to induce photodegradation over the same time period (60 h). Excitation-emission matrices (EEMs) combined with parallel factor analysis (PARAFAC) identified four components: marine humic-like C1, terrestrial humic-like C2, soil fulvic-like C3, and tryptophan-like C4. Although the behaviours of these components during full-spectrum irradiation exhibited similar decreasing tendencies, three components (C1, C3, and C4) underwent direct photodegradation under UVB exposure, whereas C2 was more susceptible to UVA degradation. The diverse photoreactivities of the source-dependent components to different light treatments led to differing photochemical behaviours of other optical indices [a
MeSH term(s)	Dissolved Organic Matter ; Spectrometry, Fluorescence ; Oceans and Seas ; Humic Substances/analysis ; Factor Analysis, Statistical ; China
Chemical Substances	Dissolved Organic Matter ; Humic Substances
Language	English
Publishing date	2023-04-30
Publishing country	England
Document type	Journal Article
ZDB-ID	120089-6
ISSN	1879-1298 ; 0045-6535 ; 0366-7111
ISSN (online)	1879-1298
ISSN	0045-6535 ; 0366-7111
DOI	10.1016/j.chemosphere.2023.138823
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Article: Variability and composition of amino acids and amino sugars in sediment cores of the Changjiang Estuary

Wei, Jin-E / Chen, Yan / Zhang, Ning / Yang, Jun-Qi / Chen, Rong / Zhang, Hong-Hai / Yang, Gui-Peng

Organic geochemistry. 2022 Jan., v. 163

2022

Abstract: Understanding the sources, compositions and degradation states of sedimentary organic matter (SOM) in estuarine regions can provide significant information about regional carbon and nitrogen cycles. Amino acids (AAs), amino sugars (ASs), total organic ... ...

Abstract	Understanding the sources, compositions and degradation states of sedimentary organic matter (SOM) in estuarine regions can provide significant information about regional carbon and nitrogen cycles. Amino acids (AAs), amino sugars (ASs), total organic carbon (TOC), total nitrogen (TN) and stable carbon isotopic composition (δ¹³OC) were investigated in six sediment cores of the Changjiang Estuary. The concentrations of ASs ranged from 0.60 to 3.11 μmol g⁻¹, and accounted for 1.7 ± 0.7% of TOC and 2.1 ± 0.9% of TN. The concentrations of AAs ranged from 5.18 to 11.66 μmol g⁻¹ and accounted for 8.1 ± 1.7% of TOC and 17.4 ± 3.9% of TN. Relatively coarse and fresh SOM was mainly deposited in the nearshore (e.g., station B6), whereas fine and degraded SOM occurred in the offshore area (e.g., station A7-4). The relationships between median grain size and AA-C% and degradation index (DI) revealed that fine-grained particles adsorbed older SOM, but sandy sediments were correlated with relatively fresh SOM. Diatoms were the main contributor of marine SOM and high primary production increased the burial of fresh SOM. TOC and TN contents and their degradation states did not exhibit distinct trends with core depth, possibly due to frequent vertical disturbance. Additionally, bacterial OM contributed 0.4–23.7% to TOC and 0.6–30.6% to TN in the sediment cores. The hypoxia of the water might have further promoted the proportion of bacterial OM in the sediments.
Keywords	estuaries ; geochemistry ; hypoxia ; nitrogen ; primary productivity ; sediments ; stable isotopes ; total nitrogen ; total organic carbon
Language	English
Dates of publication	2022-01
Publishing place	Elsevier Ltd
Document type	Article
ISSN	0146-6380
DOI	10.1016/j.orggeochem.2021.104330
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