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article

Ptinid beetles from the Cretaceous gymnosperm-dominated forests

David Peris, T. Keith Philips, Xavier Delclòs, D. Peris, more

Cretaceous Research > 2015 > 52 > Part B > 440-452

The diversity of ptinid beetles (Coleoptera: Ptinidae) is described from Cretaceous amber that originated from the North Atlantic and Western Tethian resiniferous forests. All studied specimens belong to the subfamily Anobiinae. Stegobium raritanensis sp. nov. is described from Raritan amber (Turonian in age) of Sayreville (New Jersey, USA), whereas Actenobius magneoculus sp. nov. is described from...

article

Research of the Dehydration Process of Amber-Containing Mining Mass

Valerii Korniienko, Yevhenii Malanchuk, Vitalii Zaiets, Vasyl Semeniuk, more

Inżynieria Mineralna > 2023 > no. 1 > 7--13

The article highlights the results of research into the process of dehydration of amber-containing mining mass using a vibroclassifier. Features of the technological scheme of amber extraction are described, as it relates to water supply points. The state of equilibrium of the liquid in the cell of the vibroclassifier under different conditions of sieve wettability was studied: a liquid that does...

article

Miocene Ethiopian amber: A new source of fossil cryptogams

Valentine Bouju, Kathrin Feldberg, Ulla Kaasalainen, Alfons Schäfer‐Verwimp, more

Journal of Systematics and Evolution > 60 > 4 > 932 - 954

Amber is renowned for the exceptional preservation state of its inclusions, allowing detailed morphological analysis and providing relevant environmental, palaeoecological, geographical, and geological information. Amber deposits are predominantly known from North America, Europe, and Asia, and are considered to be rare on the continents that formed Gondwana. The recent discovery of fossiliferous...

article

Accelerating the 3D reference interaction site model theory of molecular solvation with treecode summation and cut‐offs

Leighton Wilson, Robert Krasny, Tyler Luchko

Journal of Computational Chemistry > 43 > 18 > 1251 - 1270

The 3D reference interaction site model (3D‐RISM) of molecular solvation is a powerful tool for computing the equilibrium thermodynamics and density distributions of solvents, such as water and co‐ions, around solute molecules. However, 3D‐RISM solutions can be expensive to calculate, especially for proteins and other large molecules where calculating the potential energy between solute and solvent...

article

prepareforleap: An automated tool for fast PDB‐to‐parameter generation

Daniel R. Roe, Christina Bergonzo

Journal of Computational Chemistry > 43 > 13 > 930 - 935

Setting up molecular dynamics simulations from experimentally determined structures is often complicated by a variety of factors, particularly the inclusion of carbohydrates, since these have several anomer types which can be linked in a variety of ways. Here we present a stand‐alone tool implemented in the widely‐used software CPPTRAJ that can be used to automate building structures and generating...

article

Determination of the molecular weight between cross‐links for different ambers: Viscoelastic measurements of the rubbery plateau*

Dejie Kong, Yan Meng, Gregory B. McKenna

Polymer Engineering & Science > 62 > 4 > 1023 - 1040

While much is known about the chemistry of amber, there are, to our knowledge, no quantitative estimates of the molecular weight between cross‐links or quantitative estimates of the amount of cross‐linking. In the present study we provide new data that advances our understanding of ancient ambers through an investigation of the network structure based on measurements of the rubbery modulus. Then,...

article

Mycenaean Greece and Europe. Interconnections and exchanges in the light of recent research

Anthony Harding

Studia Hercynia > 2022 > 26 > 1 > 21-43

The debate over possible connections between Bronze Age Greece and the rest of the European continent, to which Jan Bouzek made major contributions throughout his career, is reviewed in the light of new con tributions and finds. Particularly important is recent work on the north Italian site of Frattesina. Other categories of evidence are considered in turn. In the light of these advances, it is possible...

article

Origin and evolution of fungus farming in wood‐boring Coleoptera – a palaeontological perspective

David Peris, Xavier Delclòs, Bjarte Jordal

Biological Reviews > 96 > 6 > 2476 - 2488

Insect–fungus mutualism is one of the better‐studied symbiotic interactions in nature. Ambrosia fungi are an ecological assemblage of unrelated fungi that are cultivated by ambrosia beetles in their galleries as obligate food for larvae. Despite recently increased research interest, it remains unclear which ecological factors facilitated the origin of fungus farming, and how it transformed into a...

article

CAN: A new program to streamline preparation of molecular coordinate files for molecular dynamics simulations

Jacob A. Parkman, Caleb A. Barksdale, David J. Michaelis

Journal of Computational Chemistry > 42 > 28 > 2031 - 2035

Preparing molecular coordinate files for molecular dynamics (MD) simulations can be a very time‐consuming process. Herein we present the development of a user‐friendly program that drastically reduces the time required to prepare these molecular coordinate files for MD software packages such as AmberTools. Our program, known as charge atomtype naming (CAN), creates and uses a library of structures...

article

Characterisation of copal resin and amber by negative‐ion electrospray ionisation Fourier transform ion cyclotron resonance mass spectrometry

Yankuan Tian, Jia‐Nan Sun, Bin Jiang, Zhao‐Wen Zhan

Journal of Mass Spectrometry > 56 > 3 > n/a - n/a

Copal resin and amber from Columbia were analysed by negative‐ion electrospray ionisation (ESI) Fourier transform ion cyclotron resonance mass spectrometry (FT‐ICR MS), with particular focus on polar compounds with relatively high molecular weights. A total of 4038 and 2755 compounds were identified between m/z 150 and 1,000 in the spectra of the copal resin and amber DCM extracts, respectively. The...

article

The surface degradation of Baltic amber: The depth‐profiling analysis and its application to historical object

Anna Rygula, Anna Klisińska‐Kopacz, Paulina Krupska, Elżbieta Kuraś, more

Journal of Raman Spectroscopy > 52 > 1 > 123 - 129

A depth profile‐scanning study of an 18th‐century gun‐powder horn as well as reference Baltic amber samples was performed using a Raman confocal microscope equipped with a 785‐nm laser. It was found that spectra collected from the surface are different than those from the bulk. The main changes are observed in the 1,700–1,400 cm⁻¹ range and are caused by degradation of the amber. The degraded layer...

article

Investigation of particle size distribution of grinded amber by electropulse discharges in a liquid medium

Chornyi, Valentyn, Kharchenko, Yevgen, Mysiura, Taras, Popova, Nataliia, more

Archive of Mechanical Engineering > 2021 > 68 > 3

article

Investigation of particle size distribution of grinded amber by electropulse discharges in a liquid medium

Valentyn Chornyi, Yevhen Kharchenko, Taras Mysiura, Nataliia Popova, more

Archive of Mechanical Engineering > 2021 > LXVIII, nr 3 > 337--348

The article presents the study results of electropulse grinding of amber in aqueous and alcoholic media at different amounts of supplied energy. Description of the electropulse grinding laboratory installation, the mechanism of the destruction process of amber particles and methods of statistical processing of experimental data are given. It was established that alcohol medium has a greater impact...

article

Selaginella was hyperdiverse already in the Cretaceous

Alexander R. Schmidt, Ledis Regalado, Stina Weststrand, Petra Korall, more

New Phytologist > 228 > 4 > 1176 - 1182

article

Computational mechanistic study of human liver glycerol 3‐phosphate dehydrogenase using ONIOM method

Ibrahim Yildiz, Banu Sizirici Yildiz

Journal of Physical Organic Chemistry > 33 > 11 > n/a - n/a

Human liver glycerol 3‐phosphate dehydrogenase catalyzes transfer of a hydride anion from NADH to dihydroxyacetone phosphate (DHAP) forming L‐glycerol 3‐phosphate and NAD⁺ in a single step reaction. It is proposed that a hydride ion is transferred from NADH to the carbonyl carbon of DHAP through a general acid catalysis in which the carbonyl oxygen of DHAP is protonated by a nearby acidic residue...

article

Blue‐blocking glasses as additive treatment for mania: Effects on actigraphy‐derived sleep parameters

Tone E. G. Henriksen, Janne Grønli, Jörg Assmus, Ole Bernt Fasmer, more

Journal of Sleep Research > 29 > 5 > n/a - n/a

Improvement of sleep is a central treatment goal for patients in a manic state. Blue‐blocking (BB) glasses as adjunctive treatment hasten overall recovery from mania. This method is an evolvement from dark therapy and builds on the discovery of the blue‐light‐sensitive retinal ganglion cell that signals daytime to the brain. We report effects of adjunctive BB glasses on actigraphy‐derived sleep parameters...

article

Structural changes from heating amber and copal as observed by nuclear magnetic resonance spectroscopy

Joseph B. Lambert, Truongan V. Nguyen, Allison J. Levy, Yuyang Wu, more

Magnetic Resonance in Chemistry > 58 > 9 > 812 - 819

Structural changes caused by heating of fossilized (amber) and semifossilized (copal) resins have been examined by nuclear magnetic resonance spectroscopy. A set of 28 samples was constituted to include different geographical sources, degrees of maturation, colors, and structural groupings. The onset of structural alterations was determined by observation of the lowest temperature at which spectral...

article

Analyzing amber color features and methods of estimating colors of amber debris

Hina Ishikawa, Yoichi Kageyama, Chikako Ishizawa, Tsuyoshi Takahashi, more

IEEJ Transactions on Electrical and Electronic Engineering > 15 > 6 > 872 - 880

In our previous study, we presented a method of estimating the color of amber using the red, green, and blue (RGB) color space and the hue, saturation, and value (HSV) color space. In particular, the method estimates the color of amber on a target image consisting of four colors (yellow, brown, black, and amber with an outer cover [AOC]). However, because of the existence of amber with a partially...

article

The fossil record of spiders revisited: implications for calibrating trees and evidence for a major faunal turnover since the Mesozoic

Ivan L. F. Magalhaes, Guilherme H. F. Azevedo, Peter Michalik, Martín J. Ramírez

Biological Reviews > 95 > 1 > 184 - 217

Studies in evolutionary biology and biogeography increasingly rely on the estimation of dated phylogenetic trees using molecular clocks. In turn, the calibration of such clocks is critically dependent on external evidence (i.e. fossils) anchoring the ages of particular nodes to known absolute ages. In recent years, a plethora of new fossil spiders, especially from the Mesozoic, have been described,...

article

The any particle molecular orbital/molecular mechanics approach

José M. Rodas, Johan F. Galindo, Adrian E. Roitberg, Andrés Reyes

Journal of Molecular Modeling > 2019 > 25 > 10 > 1-10

A computational scheme is proposed to broaden the range of applications of multicomponent methodologies for the study of local properties of big molecular systems existing in the gas phase and in solvated environments. This scheme extends the any particle molecular orbital (APMO) approach in the quantum mechanics/molecular mechanics (QM/MM) framework. As a first assessment of the performance of the...

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Search results

Ptinid beetles from the Cretaceous gymnosperm-dominated forests

Research of the Dehydration Process of Amber-Containing Mining Mass

Miocene Ethiopian amber: A new source of fossil cryptogams

Accelerating the 3D reference interaction site model theory of molecular solvation with treecode summation and cut‐offs

prepareforleap: An automated tool for fast PDB‐to‐parameter generation

Determination of the molecular weight between cross‐links for different ambers: Viscoelastic measurements of the rubbery plateau*

Mycenaean Greece and Europe. Interconnections and exchanges in the light of recent research

Origin and evolution of fungus farming in wood‐boring Coleoptera – a palaeontological perspective

CAN: A new program to streamline preparation of molecular coordinate files for molecular dynamics simulations

Characterisation of copal resin and amber by negative‐ion electrospray ionisation Fourier transform ion cyclotron resonance mass spectrometry

The surface degradation of Baltic amber: The depth‐profiling analysis and its application to historical object

Investigation of particle size distribution of grinded amber by electropulse discharges in a liquid medium

Investigation of particle size distribution of grinded amber by electropulse discharges in a liquid medium

Selaginella was hyperdiverse already in the Cretaceous

Computational mechanistic study of human liver glycerol 3‐phosphate dehydrogenase using ONIOM method

Blue‐blocking glasses as additive treatment for mania: Effects on actigraphy‐derived sleep parameters

Structural changes from heating amber and copal as observed by nuclear magnetic resonance spectroscopy

Analyzing amber color features and methods of estimating colors of amber debris

The fossil record of spiders revisited: implications for calibrating trees and evidence for a major faunal turnover since the Mesozoic

The any particle molecular orbital/molecular mechanics approach

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