Results 11 to 20 of about 5,575,915 (212)

Lattice Stiffening and Delayed Fluorescence in Columnar Liquid-Crystalline Glasses. [PDF]

Chempluschem
If the substitution pattern is well‐chosen, semiflexible triaryltriazine esters form glassy columnar liquid crystals whose column lattice distinctively shrinks at the glass transition. The presence of columnar liquid‐crystalline order is found to favor delayed fluorescence by triplet–triplet annihilation.
da Silva Kutz M, de Oliveira WA, Belarmino Cabral MG, Durola F, Bechtold IH, Westphal E, Bock H.   +6 more
europepmc   +2 more sources

A DESCOBERTA DOS RAIOS X

, 2017
O dia 8 de novembro de 1895 foi transcendente para a ciência e, principalmente, para a medicina. Wilhelm C. Roentgen, professor de Física da Universidade de Wurzburg, na Alemanha, fez uma das descobertas mais importantes da história das ciências: o achado de misteriosos raios, na época desconhecidos, que permitiam olhar dentro do corpo.
SILVA, HORÁCIO SCIGLIANO DA
core   +3 more sources

Mechanistic Insights and Catalytic Efficiency of a 2,2'-Bipyridine-Coordinated Peroxidovanadium Complex as a Haloperoxidase Biomimetic. [PDF]

Chempluschem
A peroxidovanadium(V) complex mimics vanadium haloperoxidases for eco‐friendly halogenation of organic substrates. Density functional theory studies reveal two major reaction pathways for iodide/bromide oxidation. The catalyst offers high‐yield bromination/iodination of 8‐hydroxyquinoline (73/86%) under mild conditions (30 °C, pH 5.8), and it also ...
Fachini LG, Elisandro EVS, Baptistella GB, Bottini RCR, Briganti M, Nunes GG, de Sá EL.   +6 more
europepmc   +2 more sources

Reappraisal is less effective than distraction in downregulation of neural responses to physical threats—An event‐related potential investigation

Psychophysiology, Volume 60, Issue 9, September 2023., 2023
Abstract Evolutionary threats (ETs), such as predatory animals and heights, elicit stronger fear responses and are more often the subject of specific phobias, as compared to modern threats (MTs, such as guns and motorcycles). Since processing of ET depends on lower‐order, phylogenetically conserved neural fear circuits, it may be less susceptible to ...
Agnieszka K. Adamczyk, Miroslaw Wyczesany, Karin Roelofs, Jacobien M. van Peer   +3 more
wiley   +1 more source

Anxiety attenuates learning advantages conferred by statistical stability and induces loss of volatility‐attuning in brain activity

Human Brain Mapping, Volume 44, Issue 6, Page 2557-2571, April 15, 2023., 2023
To determine how anxious individuals learn during stable and volatile environments, we used an auditory oddball reversal paradigm combined with threat‐of‐shock during fMRI scanning. We found that threat eliminates the behavioural learning advantages of stable over volatile environments.
Elise G. Rowe, Clare D. Harris, Ilvana Dzafic, Marta I. Garrido   +3 more
wiley   +1 more source

Acute stress alters probabilistic reversal learning in healthy male adults

European Journal of Neuroscience, Volume 57, Issue 5, Page 824-839, March 2023., 2023
In this study, we investigated the effect of acute psychosocial stress on flexible behavioural adaptation using a reversal learning task during fMRI scanning and after a Trier Social Stress Test in 28 healthy male participants. We found a small improving effect on task performance accuracy, which was best explained by Rescorla–Wagner double updating in
Lara Wieland, Claudia Ebrahimi, Teresa Katthagen, Martin Panitz, Lennart Luettgau, Andreas Heinz, Florian Schlagenhauf, Zsuzsika Sjoerds   +7 more
wiley   +1 more source

Forest disturbance and growth processes are reflected in the geographical distribution of large canopy gaps across the Brazilian Amazon

Journal of Ecology, Volume 110, Issue 12, Page 2971-2983, December 2022., 2022
The proportion of large gaps in the forest canopy varied substantially over the Brazilian Amazon. We have shown that the trends can be explained by geographical variation in disturbance and growth. The frequency of extreme weather events is predicted to increase under climate change, and changes could lead to greater forest disturbance, which should be
Cristiano Rodrigues Reis, Toby D. Jackson, Eric Bastos Gorgens, Ricardo Dalagnol, Tommaso Jucker, Matheus Henrique Nunes, Jean Pierre Ometto, Luiz E. O. C. Aragão, Luiz Carlos Estraviz Rodriguez, David A. Coomes   +9 more
wiley   +1 more source

mRNA vaccines in the prevention and treatment of diseases

MedComm, Volume 3, Issue 3, September 2022., 2022
Mechanisms of mRNA vaccines for infectious diseases and cancers. mRNA molecules encoding tumor antigens are injected into body (either with or without delivery vehicles). The mRNA molecules are taken up and translated into protein antigens by antigen‐presenting cells (APCs).
Yangzhuo Gu, Jiangyao Duan, Na Yang, Yuxin Yang, Xing Zhao   +4 more
wiley   +1 more source

Developing a CRISPR‐assisted base‐editing system for genome engineering of Pseudomonas chlororaphis

Microbial Biotechnology, Volume 15, Issue 9, Page 2324-2336, September 2022., 2022
In this study, we established a CRISPR‐assisted base‐editing (CBE) system for Pseudomonas chlororaphis. This CBE system converts C:G into T:A without DNA strands breaks or any donor DNA template. By engineering a premature STOPcodon in target spacers, the hmgA and phzO genes ofP. chlororaphis were successfully interrupted with high efficiency.
Sheng‐Jie Yue, Peng Huang, Song Li, Yu‐Yuan Cai, Wei Wang, Xue‐Hong Zhang, Pablo I. Nikel, Hong‐Bo Hu   +7 more
wiley   +1 more source

Identificaçao radiológica de dispositivos cardíacos eletrônicos implantáveis

Journal of Cardiac Arrhythmias, 2017
INTRODUÇAO: Este trabalho teve por objetivos identificar as características comuns aos geradores e classificá-los no menor número possível de grupos para facilitar a identificaçao radiológica, e, também, identificar características que permitam ...
Bruno Pereira Valdigem, Nilton José Carneiro da Silva, Rogerio Braga Andalaft, Celso Salgado de Melo   +3 more
doaj   +4 more sources