Results 101 to 110 of about 262,566 (370)

Structures of Molecules at the Atomic Level: Caffeine and Related Compounds [PDF]

arXiv, 2008
Recent rsearches have shown that the lengths of the chemical bonds, whether completely or partially covalent or ionic, are sums of the radii of the adjacent atoms and/or ions. On investigating the bond length data for the molecular components of nucleic acids, all were found (for the first time) to be effectively the sums of the covalent radii of the ...
arxiv  

Cyclic Alternating Pattern Dynamics in Individuals at Risk for Developing Parkinson's Disease

Annals of Neurology, EarlyView.
Objective The objective of this study was to investigate the differences in cyclic alternating patterns (CAP) metrics, a non‐rapid eye movement (NREM) sleep physiological rhythm, among recently diagnosed patients with Parkinson's disease (PD), and individuals at high and low risk for developing PD based on genetic and prodromal risk.
Andrew Dagay, Shlomit Katzav, Danielle Wasserman, Valentina Gnoni, Anat Mirelman, Riva Tauman   +5 more
wiley   +1 more source

Diamond Chemistry: Advances and Perspectives

Angewandte Chemie International Edition, Accepted Article.
Diamond as a material has many unique properties. More recently, diamond has emerged as a material with a wide range of applications in chemistry and biology. The high intrinsic stability of diamond, coupled with the ability to modify diamond surfaces with a wide range of species via highly stable covalent linkages, provides a wealth of opportunity to ...
Nianjun Yang, Anke Krueger, Robert J. Hamers   +2 more
wiley   +1 more source

Effects of Reapeated Doses of Caffeine on Performance and Alertness: New Data and Secondary Analyses [PDF]

, 2007
Rationale The effects of caffeine on mood and performance are well established. Some authors suggest that caffeine merely reverses effects of caffeine withdrawal rather than having direct behavioural effects. It has also been suggested that withdrawal
Baddeley, Baddeley, Broadbent, Christopher, Durlach, Fredholm, Haskell, Heatherley, Herbert, Hewlett, Hewlett, Hewlett, James, Lieberman, Lorist, Robelin, Smit, Smith, Smith, Smith, Smith, Walther, Yeomans   +22 more
core   +1 more source

Growth Pattern and Degradation Activity of Caffeine-degrading Bacteria Consortium

Jurnal Ilmu Dasar
Caffeine-degrading bacteria can be used as agents to degrade caffeine, thereby reducing the concentration of caffeine in organic waste. The decomposition process is carried out by a single bacterium or a consortium of bacteria.
Nadhea Ayu Suksma, Esti Utarti, Sattya Arimurti   +2 more
doaj   +1 more source

Effect of caffeine ingestion on anaerobic capacity quantified by different methods.

PLoS ONE, 2017
We investigated whether caffeine ingestion before submaximal exercise bouts would affect supramaximal oxygen demand and maximal accumulated oxygen deficit (MAOD), and if caffeine-induced improvement on the anaerobic capacity (AC) could be detected by ...
Lucyana Arcoverde, Rodrigo Silveira, Fabiano Tomazini, André Sansonio, Romulo Bertuzzi, Adriano Eduardo Lima-Silva, Victor Amorim Andrade-Souza   +6 more
doaj   +1 more source

Photoredox Autocatalysis: Towards a Library of Generally Applicable Sulfonamide Reductive Photocatalysts

Angewandte Chemie International Edition, EarlyView.
Photoredox autocatalysis is revealed to access cyclic biaryl sulfonamides (BASNs) without an initial exogenous photocatalyst. While unveiling photoredox autocatalysis is important to the enrichment of basic research, this has also led to further practical applications such as rapid discovery of novel, potent and readily accessible photocatalyst ...
Jaspreet Kaur, Mark John P. Mandigma, Nakul Abhay Bapat, Joshua P. Barham   +3 more
wiley   +1 more source

The Xenopus Chk1 Protein Kinase Mediates a Caffeine-sensitive Pathway of Checkpoint Control in Cell-free Extracts [PDF]

, 1998
We have analyzed the role of the protein kinase Chk1 in checkpoint control by using cell-free extracts from Xenopus eggs. Recombinant Xenopus Chk1 (Xchk1) phosphorylates the mitotic inducer Cdc25 in vitro on multiple sites including Ser-287.
Dunphy, William G., Emami, Katayoon H., Guo, Zijian, Kumagai, Akiko, Wang, Sophie X.   +4 more
core   +1 more source

Induction of chromosome shattering by ultraviolet light and caffeine [PDF]

, 1981
Synchronized and asynchronously growing cells of a V79 sub-line of the Chinese hamster were either partial-cell irradiation (λ, 254 nm) or laser-UV-microirradiated (λ, 257 nm).
Bender, Cremer, Cremer, Cremer, Cremer, Cremer, Cremer, Cremer, Evans, Freed, Hatfield, Horan, Kato, Kato, Kato, Kihlman, Kihlman, Kihlman, Lehmann, Lennhouts, Nichols, Nichols, Nichols, Nichols, Nilsson, Roberts, Roberts, Schor, Sperling, Stich, Wolff, Zorn, Zorn, Zorn, Zur Hausen   +34 more
core   +1 more source

Sudden Caffeine Withdrawal Triggers Migraine—A Randomized Controlled Trial

Frontiers in Neurology, 2020
Objective: Assessing the effects of caffeine withdrawal on migraine.Background: The effects of caffeine withdrawal on migraineurs are at large unknown.Methods: This was a randomized, double-blind, crossover study (NCT03022838), designed to enroll 80 ...
Karl B. Alstadhaug, Karl B. Alstadhaug, Hilde Karen Ofte, Kai Ivar Müller, Kai Ivar Müller, Anna P. Andreou, Anna P. Andreou   +6 more
doaj   +1 more source