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Items from 81 to 100 out of 2,299,245 results

article

Anthropological genetic insights on Caribbean population history

Maria A. Nieves‐Colón

Evolutionary Anthropology: Issues, News, and Reviews > 31 > 3 > 118 - 137

As the last American region settled by humans, yet the first to experience European colonization, the Caribbean islands have a complex history characterized by continuous migration, admixture, and demographic change. In the last 20 years, genetics research has transformed our understanding of Caribbean population history and revisited major debates in Caribbean anthropology, such as those surrounding...

article

Rocks and clocks revised: New promises and challenges in dating the primate tree of life

Luca Pozzi, Anna Penna

Evolutionary Anthropology: Issues, News, and Reviews > 31 > 3 > 138 - 153

In recent years, multiple technological and methodological advances have increased our ability to estimate phylogenies, leading to more accurate dating of the primate tree of life. Here we provide an overview of the limitations and potentials of some of these advancements and discuss how dated phylogenies provide the crucial temporal scale required to understand primate evolution. First, we review...

article

Underappreciated pioneers

Kristin Carline, Suzanne Kunitz, Bernard Wood

Evolutionary Anthropology: Issues, News, and Reviews > 31 > 3 > 112 - 117

This contribution focuses on a 1928 multiauthor paper reporting the discovery of a child's skull at Devil's Tower cave on the Rock of Gibraltar. It was ground‐breaking. Two of the lead authors, Dorothy Garrod and Dorothea Bate, were women, and it was one of the earliest reports of a fossil hominin to incorporate and integrate detailed information about its stratigraphic and environmental context.

article

Site‐specific functional roles of the Factor X activation peptide in the intrinsic tenase‐mediated Factor X activation

Amalie Carnbring Bonde, Sofie Rosenørn Hansen, Eva Johansson, Jais Rose Bjelke, more

FEBS Letters > 596 > 12 > 1567 - 1575

The conversion of zymogen Factor X (FX) to an active protease involves the removal of a 52‐residue long activation peptide (AP). Through site‐directed mutagenesis, we investigate the role of the AP and demonstrate that the high abundance of proline residues is important for efficient proteolysis of FX. Moreover, we identify an essential interaction site for Factor IXa (FIXa) between residues 22 and...

article

An Empirical Assessment of Collusion in the Negotiable Certificates of Deposit Market in Korea: A Discriminant Analysis

Jiyoung Lee, Jung Jae Kim, Jinook Jeong

Asian Economic Journal > 36 > 2 > 203 - 223

This paper econometrically evaluates if collusion actually occurred in the negotiable certificates of deposit (CD) market during the period of Korea Fair Trade Commission's (KFTC) investigation. We propose a general mixture regression model to discriminate the collusion period from the competitive period. We apply our method to Korean CD market data from 1 January 2009 to 23 May 2019 and forecast...

article

Issue Information

Asian Economic Journal > 36 > 2 > 224 - 226

article

Injection site microflora in persons with diabetes: why needle reuse is not associated with increased infections?

Sofia Wareham‐Mathiassen, Lene Bay, Vera Pinto Glenting, Naireen Fatima, more

APMIS > 130 > 7 > 404 - 416

Needle reuse is a common practice and primary cause of customer compliance issues such as pain, bruising, clogging, injection site reactions (ISR), and associated lipodystrophy. This study aimed to characterize skin microflora at injection sites and establish microbial contamination of used pen injectors and needles. The second objective was to evaluate the risk of infections during typical and repeated...

article

Aspergilloma complicating previous COVID‐19 pneumonitis – a case report

Gry Banke, Peter Kjeldgaard, Saher Burhan Shaker, Pradeesh Sivapalan, more

APMIS > 130 > 7 > 397 - 403

Aspergillomas are found in pre‐existing cavities in pulmonary parenchyma. To the best of our knowledge, aspergilloma has not previously been reported in COVID‐19‐associated pulmonary architecture distortion combined with barotrauma from invasive mechanical ventilation therapy. We present a case of a 67‐year‐old woman, who suffered from severe COVID‐19 in the summer of 2020 with no suspicion of infection...

article

Organic Ammonium Ion Battery: A New Strategy for a Nonmetallic Ion Energy Storage System

Haode Zhang, Yu Tian, Wenxuan Wang, Zelang Jian, more

Angewandte Chemie International Edition > 61 > 27 > n/a - n/a

Nonmetallic ammonium (NH₄⁺) ion batteries are promising candidates for large‐scale energy storage systems, which have the merit of low molar mass, sustainability, non‐toxicity and non‐dendrite. Herein, for the first time, we introduce the novel organic ammonium ion batteries (OAIBs). Significantly, a manganese‐based Prussian white analogue (noted as MnHCF) as cathode exhibits a reversible capacity...

article

Highly Fluorescent Bipyrrole‐Based Tetra‐BF₂ Flag‐Hinge Chromophores: Achieving Multicolor and Circularly Polarized Luminescence

Luxia Cui, Hyuga Shinjo, Takafumi Ichiki, Koichi Deyama, more

Angewandte Chemie International Edition > 61 > 27 > n/a - n/a

This study reports the facile syntheses of tetra‐boron difluoride (tetra‐BF₂) complexes, flag‐hinge‐like molecules that exhibit intense green‐to‐orange luminescence in solution and yellow‐to‐red emission in the solid states. Single‐crystal structure analysis and density functional theory calculations suggested a bent structure of this series of compounds. The complexes also exhibited excellent optical...

article

Layered Organic Metal Chalcogenides (OMCs): From Bulk to Two‐Dimensional Materials

Guan‐E Wang, ShaoZhen Luo, Tuo Di, ZhiHua Fu, more

Angewandte Chemie International Edition > 61 > 27 > n/a - n/a

The modification of inorganic two‐dimensional (2D) materials with organic functional motifs is in high demand for the optimization of their properties, but it is still a daunting challenge. Organic metal chalcogenides (OMCs) are a type of newly emerging 2D materials, with metal chalcogenide layers covalently anchored by long‐range ordered organic functional motifs, these materials are extremely desirable...

article

Multimodal Imaging‐Guided Photothermal Immunotherapy Based on a Versatile NIR‐II Aggregation‐Induced Emission Luminogen

Dingyuan Yan, Miao Wang, Qian Wu, Niu Niu, more

Angewandte Chemie International Edition > 61 > 27 > n/a - n/a

Synergistic photothermal immunotherapy has captured great attention owing to the mutually strengthening therapeutic outcomes towards both original tumors and abscopal tumors. Herein, a versatile theranostic agent displaying aggregation‐induced emission, namely TPA‐BT‐DPTQ, was designed and prepared based on benzo[c]thiophene unit as a building block; it can be used for simultaneous fluorescence imaging...

article

Efficient Triplet‐Triplet Annihilation Upconversion Sensitized by a Chromium(III) Complex via an Underexplored Energy Transfer Mechanism

Cui Wang, Florian Reichenauer, Winald R. Kitzmann, Christoph Kerzig, more

Angewandte Chemie International Edition > 61 > 27 > n/a - n/a

Sensitized triplet‐triplet annihilation upconversion (sTTA‐UC) mainly relies on precious metal complexes thanks to their high intersystem crossing (ISC) efficiencies, excited state energies, and lifetimes, while complexes of abundant first‐row transition metals are only rarely utilized and with often moderate UC quantum yields. [Cr(bpmp)₂]³⁺ (bpmp=2,6‐bis(2‐pyridylmethyl)pyridine) containing earth‐abundant...

article

Photocatalytic Chemical Crosslinking for Profiling RNA–Protein Interactions in Living Cells

Huixin Luo, Wei Tang, Hongyu Liu, Xiangmei Zeng, more

Angewandte Chemie International Edition > 61 > 27 > n/a - n/a

The dynamic interactions between RNAs and proteins play crucial roles in regulating diverse cellular processes. Proteome‐wide characterization of these interactions in their native cellular context remains desirable but challenging. Herein, we developed a photocatalytic crosslinking (PhotoCAX) strategy coupled with mass spectrometry (PhotoCAX‐MS) and RNA sequencing (PhotoCAX‐seq) for the study of...

article

Modular Nitrogen‐Doped Concave Polycyclic Aromatic Hydrocarbons for High‐Performance Organic Light‐Emitting Diodes with Tunable Emission Mechanisms**

Jakub Wagner, Paola Zimmermann Crocomo, Michał Andrzej Kochman, Adam Kubas, more

Angewandte Chemie International Edition > 61 > 27 > n/a - n/a

Although bowl‐shaped N‐pyrrolic polycyclic aromatic hydrocarbons (PAHs) can achieve excellent electron‐donating ability, their application for optoelectronics is hampered by typically low photoluminescence quantum yields (PLQYs). To address this issue, we report the synthesis and characterization of a series of curved and fully conjugated nitrogen‐doped PAHs. Through structural modifications to the...

article

Poly(ionic liquid)‐Armored MXene Membrane: Interlayer Engineering for Facilitated Water Transport

Ming Yi, Mi Wang, Yan Wang, Yanlei Wang, more

Angewandte Chemie International Edition > 61 > 27 > n/a - n/a

Two‐dimensional (2D) MXene‐based lamellar membranes bearing interlayers of tunable hydrophilicity are promising for high‐performance water purification. The current challenge lies in how to engineer the pore wall's surface properties in the subnano‐confinement environment while ensuring its high selectivity. Herein, poly(ionic liquid)s, equipped with readily exchangeable counter anions, succeeded...

article

Manganese‐Catalysed Deuterium Labelling of Anilines and Electron‐Rich (Hetero)Arenes

Florian Bourriquen, Nils Rockstroh, Stephan Bartling, Kathrin Junge, more

Angewandte Chemie International Edition > 61 > 27 > n/a - n/a

There is a constant need for deuterium‐labelled products for multiple applications in life sciences and beyond. Here, a new class of heterogeneous catalysts is reported for practical deuterium incorporation in anilines, phenols, and heterocyclic substrates. The optimal material can be conveniently synthesised and allows for high deuterium incorporation using deuterium oxide as isotope source. This...

article

Minimizing the Reorganization Energy of Cobalt Redox Mediators Maximizes Charge Transfer Rates from Quantum Dots

Madeleine J. Fort, Sophia M. Click, Evan H. Robinson, Felix M. C. He, more

Angewandte Chemie International Edition > 61 > 27 > n/a - n/a

Light‐induced charge separation is at the very heart of many solar harvesting technologies. The reduction of energetic barriers to charge separation and transfer increases the rate of separation and the overall efficiency of these technologies. Here we report that the internal reorganization energy of the redox acceptor, the movement of the atoms with changing charge, has a profound effect on the...

article

Bonding in a Crystalline Tri‐Thorium Cluster: Not σ‐Aromatic But Still Unique

Dariusz W. Szczepanik

Angewandte Chemie > 134 > 27 > n/a - n/a

Very recently, Boronski et al. reported the first thorium–thorium bond in a crystalline cluster prepared under normal experimental conditions. By using a range of experimental techniques and computational models, the authors found that the isolated actinide cluster contains at its heart two paired electrons delocalized over the tri‐thorium ring. The recorded Raman spectrum allegedly confirmed the...

article

Avoiding Structural Collapse to Reduce Lead Leakage in Perovskite Photovoltaics

Xueyuan Wei, Mengqi Xiao, Boyu Wang, Chenyue Wang, more

Angewandte Chemie > 134 > 27 > n/a - n/a

Perovskite solar cells (PSCs) have become a promising candidate for the next‐generation photovoltaic technologies. As an essential element for high‐efficiency PSCs however, the heavy metal Pb is soluble in water, causing a serious threat to the environment and human health. Due to the weak ionic bonding in three‐dimensional (3D) perovskites, drastic structure decomposition occurs when immersing the...

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INFONA - science communication portal

Search results

Anthropological genetic insights on Caribbean population history

Rocks and clocks revised: New promises and challenges in dating the primate tree of life

Underappreciated pioneers

Site‐specific functional roles of the Factor X activation peptide in the intrinsic tenase‐mediated Factor X activation

An Empirical Assessment of Collusion in the Negotiable Certificates of Deposit Market in Korea: A Discriminant Analysis

Issue Information

Injection site microflora in persons with diabetes: why needle reuse is not associated with increased infections?

Aspergilloma complicating previous COVID‐19 pneumonitis – a case report

Organic Ammonium Ion Battery: A New Strategy for a Nonmetallic Ion Energy Storage System

Highly Fluorescent Bipyrrole‐Based Tetra‐BF₂ Flag‐Hinge Chromophores: Achieving Multicolor and Circularly Polarized Luminescence

Layered Organic Metal Chalcogenides (OMCs): From Bulk to Two‐Dimensional Materials

Multimodal Imaging‐Guided Photothermal Immunotherapy Based on a Versatile NIR‐II Aggregation‐Induced Emission Luminogen

Efficient Triplet‐Triplet Annihilation Upconversion Sensitized by a Chromium(III) Complex via an Underexplored Energy Transfer Mechanism

Photocatalytic Chemical Crosslinking for Profiling RNA–Protein Interactions in Living Cells

Modular Nitrogen‐Doped Concave Polycyclic Aromatic Hydrocarbons for High‐Performance Organic Light‐Emitting Diodes with Tunable Emission Mechanisms**

Poly(ionic liquid)‐Armored MXene Membrane: Interlayer Engineering for Facilitated Water Transport

Manganese‐Catalysed Deuterium Labelling of Anilines and Electron‐Rich (Hetero)Arenes

Minimizing the Reorganization Energy of Cobalt Redox Mediators Maximizes Charge Transfer Rates from Quantum Dots

Bonding in a Crystalline Tri‐Thorium Cluster: Not σ‐Aromatic But Still Unique

Avoiding Structural Collapse to Reduce Lead Leakage in Perovskite Photovoltaics

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