98 Works

Complexation of Ferrocene Derivatives by the Cucurbit[7]uril Host:  A Comparative Study of the Cucurbituril and Cyclodextrin Host Families

Woo Sung Jeon, Kwangyul Moon, Sang Hyun Park, Hyungpil Chun, Young Ho Ko, Jin Yong Lee, Eun Sung Lee, S. Samal, N. Selvapalam, Mikhail V. Rekharsky, Vladimir Sindelar, David Sobransingh, Yoshihisa Inoue, Angel E. Kaifer & Kimoon Kim
The formation of inclusion complexes between cucurbit[7]uril (CB[7]) and ferrocene and its derivatives has been investigated. The X-ray crystal structure of the 1:1 inclusion complex between ferrocene and CB[7] revealed that the guest molecule resides in the host cavity with two different orientations. Inclusion of a set of five water-soluble ferrocene derivatives in CB[7] was investigated by 1H NMR spectroscopy and calorimetric and voltammetric techniques. Our data indicate that all neutral and cationic guests form...

Interaction between hunting strategy, habitat type and stratum drive intraguild predation and cannibalism

Radek Michalko, Radek Michalko, Klaus Birkhofer & Stano Pekár
Intraguild predation (IGP) is a common interaction between generalist predators when they competitively exploit similar resources and prey on each other. Theoretical models predict limitations for intraguild predator coexistence unless some mechanisms, such as utilization of alternative prey (i.e., trophic niche partitioning) and cannibalism, increase the relative intraspecific clustering and interspecific segregation. As hunting strategies determine trophic niches of predators and their own vulnerability to predation, the hunting strategies may also determine the relative importance...

Data from: Holokinetic drive: centromere drive in chromosomes without centromeres

Petr Bureš & František Zedek
Similar to how the model of centromere drive explains the size and complexity of centromeres in monocentrics (organisms with localized centromeres), our model of holokinetic drive is consistent with the divergent evolution of chromosomal size and number in holocentrics (organisms with non-localized centromeres) exhibiting holokinetic meiosis (holokinetics). Holokinetic drive is proposed to facilitate chromosomal fission and/or repetitive DNA removal (or any segmental deletion) when smaller homologous chromosomes are preferentially inherited or chromosomal fusion and/or repetitive...

Data from: Weak link between dispersal and parasite community differentiation or immunogenetic divergence in two sympatric cichlid fishes

Pascal I. Hablützel, Arnout F. Grégoir, Maarten P. M. Vanhove, Filip A. M. Volckaert & Joost A. M. Raeymaekers
Geographical isolation, habitat variation and trophic specialization have contributed to a large extent to the astonishing diversity of cichlid fishes in the Great East African lakes. Because parasite communities often vary across space and environments, parasites can accompany and potentially enhance cichlid species diversification. However, host dispersal may reduce opportunities for parasite-driven evolution by homogenizing parasite communities and allele frequencies of immunity genes. To test for the relationships between parasite community variation, host dispersal and...

Data from: Fine-scale vertical stratification and guild composition of saproxylic beetles in lowland and montane forests: similar patterns despite low faunal overlap

Matthias Weiss, Jiří Procházka, Jiří Schlaghamerský & Lukas Cizek
The finer scale patterns of arthropod vertical stratification in forests are rarely studied and poorly understood. Further, there are no studies investigating whether and how altitude affects arthropod vertical stratification in temperate forests. We therefore investigated the fine-scale vertical stratification of diversity and guild structure of saproxylic beetles in temperate lowland and montane forests and compared the resulting patterns between the two habitats. The beetles were sampled with flight intercept traps arranged into vertical transects...

Data from: Monophyletic origin and evolution of the largest crucifer genomes

Terezie Mandáková, Petra Hloušková, Dmitry A. German & Martin A. Lysak
Clade E, or the Hesperis-clade is one of the major Brassicaceae (Crucifereae) clades comprising some 48 genera and 351 species classified into seven tribes and is predominantly distributed across arid and montane regions of Asia. Several taxa have socio-economic significance, being important ornamental but also weedy and invasive species. From the comparative genomic perspective, the clade is noteworthy as it harbors species with the largest crucifer genomes but low numbers of chromosomes (n = 5...

Data from: The Aquilegia genome provides insight into adaptive radiation and reveals an extraordinarily polymorphic chromosome with a unique history

Danièle L. Filiault, Evangeline S. Ballerini, Terezie Mandakova, Gökçe Aköz, Nathan J. Derieg, Jeremy Schmutz, Jerry Jenkins, Jane Grimwood, Shengqiang Shu, Richard D. Hayes, Uffe Hellsten, Kerrie Barry, Juying Yan, Sirma Mihaltcheva, Miroslava Karafiatova, Viktoria Nizhynska, Elena M. Kramer, Martin A. Lysak, Scott A. Hodges & Magnus Nordborg
The columbine genus Aquilegia is a classic example of an adaptive radiation, involving a wide variety of pollinators and habitats. Here we present the genome assembly of A. coerulea 'Goldsmith', complemented by high-coverage sequencing data from 10 wild species covering the world-wide distribution. Our analyses reveal extensive allele sharing among species, and demonstrate that introgression and selection played a role in the Aquilegia radiation. We also present the remarkable discovery that the evolutionary history of...

Data from: Strategic exploitation of fluctuating asymmetry in male Endler's guppy courtship displays is modulated by social environment

Radomil Rezucha & Martin Reichard
Lateral asymmetry in signalling traits enables males to strategically exploit their best side. In many animals, both body colouration and fluctuating asymmetry are signals of male attractiveness. We demonstrated experimentally that even sexually naïve male Poecilia wingei were able to identify their most attractive side (i.e. that with a higher proportion of carotenoid pigmentation) and use it preferentially during courtship. Notably, males retained their strategic signalling in a male-biased social environment, whereas they ceased to...

Data from: Metazoan parasites of African annual killifish (Nothobranchiidae): abundance, diversity, and their environmental correlates

Veronika Nezhybová, Martin Reichard, Radim Blažek & Markéta Ondračková.
Estimates of biodiversity and its global patterns are affected by parasite richness and specificity. Despite this, parasite communities are largely neglected in biodiversity estimates, especially in the tropics. We studied the parasites of annual killifish of the genus Nothobranchius that inhabit annually desiccating pools across the African savannah and survive the dry period as developmentally arrested embryos. Their discontinuous, non-overlapping generations make them a unique organism in which to study natural parasite fauna. We investigated...

Habitats of Pleistocene megaherbivores reconstructed from the frozen fauna remains

Irena Axmanová, Jan Robovský, Lubomír Tichý, Jiri Danihelka, Elena Troeva, Albert Protopopov & Milan Chytrý
The Late Pleistocene landscape in northern Eurasia and North America was inhabited by a specific megafaunal complex, which largely disappeared during the Pleistocene/Holocene transition. Vegetation changes are considered as one of the factors responsible for these extinctions, but the structure and composition of the Pleistocene vegetation are still poorly known. Here we complement previous studies by comparing the taxonomic composition of the plant remains found in the gastrointestinal tracts of the frozen carcasses of Pleistocene...

Data from: The leaf economic and plant size spectra of European forest understory vegetation

Josep Padullés Cubino, Idoia Biurrun, Gianmaria Bonari, Tatiana Braslavskaya, Xavier Font, Ute Jandt, Florian Jansen, Valerijus Rašomavičius, Wolfgang Willner & Milan Chytrý
Forest understories play a vital role in ecosystem functioning and the provision of ecosystem services. However, the extent to which environmental conditions drive dominant ecological strategies in forest understories at the continental scale remains understudied. Here, we used ~29,500 forest vegetation plots sampled across Europe and classified into 25 forest types to explore the relative role of macroclimate, soil pH, and tree canopy cover in driving abundance-weighted patterns in the leaf economic spectrum (LES) and...

Data from: Selection on multiple sexual signals in two Central- and Eastern-European populations of the barn swallow

Peter Laszlo Pap, Attila Fülöp, Marie Adamkova-Kotasova, Jaroslav Cepak, Romana Michalkova, Rebecca J. Safran, Alexandru N. Stermin, Oldrich Tomasek, Csongor I. Vágási, Orsolya Vincze, Matthew R. Wilkins & Tomas Albrecht
Variation in intensity and targets of sexual selection on multiple traits has been suggested to play a major role in promoting phenotypic differentiation between populations, although the divergence in selection may depend on year, local conditions or age. In this study, we quantified sexual selection for two putative sexual signals across two Central and East European barn swallow (Hirundo rustica rustica) populations from Czech Republic and Romania over multiple years. We then related these differences...

Data from: Testing macroecological abundance patterns: the relationship between local abundance and range size, range position and climatic suitability among European vascular plants

Maria Sporbert, Petr Keil, Gunnar Seidler, Helge Bruelheide, Ute Jandt, Svetlana Aćić, Idoia Biurrun, Juan Antonio Campos, Andraž Čarni, Milan Chytrý, Renata Custerevska, Jürgen Dengler, Valentin Golub, Florian Jansen, Anna Kuzemko, Jonathan Lenoir, Corrado Marcenò, Jesper Erenskjold Moeslund, Aaron Pérez-Haase, Solvita Rūsiņa, Urban Šilc, Ioannis Tsiripidis, Vigdis Vandvik, Kiril Vassilev, Risto Virtanen … & Erik Welk
Aim: A fundamental question in macroecology centres around understanding the relationship between species’ local abundance and their distribution in geographic and climatic space (i.e. the multi-dimensional climatic space or climatic niche). Here, we tested three macroecological hypotheses that link local abundance to the following range properties: (1) the abundance-range size relationship, (2) the abundance-range centre relationship, and (3) the abundance-suitability relationship. Location: Europe Taxon: Vascular plants Methods: Distribution range maps were extracted from the Chorological...

Dataset for estimation of the biotic and climatic niche breadths and geographic range size of beech (Fagus) species worldwide

Qiong Cai, Erik Welk, Chengjun Ji, Wenjing Fang, Francesco Maria Sabatini, Jianxiao Zhu, Jiangling Zhu, Zhiyao Tang, Fabio Attorre, Juan Antonio Campos, Andraž Čarni, Milan Chytrý, Süleyman Çoban, Jürgen Dengler, Jiri Dolezal, Richard Field, József Pál Frink, Hamid Gholizadeh, Adrian Indreica, Ute Jandt, Dirk Nikolaus Karger, Jonathan Lenoir, Robert K. Peet, Remigiusz Pielech, Michele De Sanctis … & Helge Bruelheide
This dataset could be used to test whether the commonly observed positive range size–niche breadth relationship, as posited by the “niche breadth hypothesis”, exists for Fagus, one of the most dominant and widespread broad‐leaved deciduous tree genera in temperate forests of the Northern Hemisphere. There are many ways to estimate niche breadth. Here, we estimated biotic and climatic niche breadths per species using plot‐based co‐occurrence data and climate data, respectively. The range sizes of the...

Thermodynamics of Halide Binding to a Neutral Bambusuril in Water and Organic Solvents

Tomas Fiala, Kristina Sleziakova, Kamil Marsalek, Karolina Salvadori & Vladimir Sindelar
Driving forces of anion binding in water in contrast to nonpolar environments are of high interest because of their relevance to biology and medicine. Here we report a neutral bambusuril macrocycle (1), soluble in both water and nonpolar solvents due to decoration with 12 polyethylene glycol-based substituents. The new bambusuril has the highest affinity for I– in pure water ever reported for a synthetic macrocycle relying on hydrogen bonding interactions rather than metal coordination or...

Hypervalent Iodine Based Reversible Covalent Bond in Rotaxane Synthesis

Vladimir Sindelar, Václav Havel, Marek Nečas, Markéta Kandrnálová & Zoran Kokan
The interlocked bambusuril: Reactive hypervalent iodine species possessing dynamic covalent bonds are utilized in a constitutive sense for the near quantitative synthesis of rotaxanes via the stabili...

Propanediurea-Based Molecular Clips Bind Halide Anions: An Insight into the Mechanism of Cucurbituril Formation

Tomas Lizal, Lukas Ustrnul, Marek Necas & Vladimir Sindelar
The synthesis and supramolecular properties of the first methylene-bridged propanediurea-based dimers are described. These dimers, bearing an aromatic sidewall, have the shape of molecular clips. Unlike glycoluril-based dimers, these clips neither dimerize nor accept any organic guests, due to their small cavities. Both propanediurea- and glycoluril-based dimers bind halide anions on the convex side of the molecules, even in highly polar organic solvents. This observation brings new insights into the mechanism of cucurbituril formation.

Anion Binding by Bambus[6]uril Probed in the Gas Phase and in Solution

Vladimir Sindelar, Jan Svec, Ágnes Révész, Detlef Schröder & Michaela Wimmerová
Electrospray ionization mass spectrometry (ESI-MS) is used to probe the binding of small anions to the macrocycle of bambus[6]uril. For the halide ions, the experimental patterns suggest F– < Cl– < Br– < I–, which is consistent with the order of anion binding found in the condensed phase. Parallel equilibrium studies in the condensed phase establish the association constants of halide anions and bambus[6]uril in mixed solvents. A detailed analysis of the mass spectrometric data...

Effects of cucurbituril size on the binding of a lutidine guest

Jan Svec, Vladimir Sindelar & Angel E. Kaifer
Six- and seven-membered cucurbiturils form inclusion complexes with a lutidine derivative. These inclusion complexes differ in the binding mode, stability, kinetics of complexation, and sensitivity toward basic media.

Bambusuril as a One-Electron Donor for Photoinduced Electron Transfer to Methyl Viologen in Mixed Crystals

Tomas Fiala, Lucie Ludvíková, Dominik Heger, Jan Švec, Tomáš Slanina, L’ubica Vetráková, Michal Babiak, Marek Nečas, Petr Kulhánek, Petr Klán & Vladimir Sindelar
Methyl viologen hexafluorophosphate (MV2+·2PF6–) and dodecamethylbambus[6]uril (BU6) form crystals in which the layers of viologen dications alternate with those of a 1:2 supramolecular complex of BU6 and PF6–. This arrangement allows for a one-electron reduction of MV2+ ions upon UV irradiation to form MV+• radical cations within the crystal structure with half-lives of several hours in air. The mechanism of this photoinduced electron transfer in the solid state and the origin of the long-lived charge-separated...

Cucurbiturils Substituted on the Methylene Bridge

Laura Gilberg, Muhammad S. A. Khan, Marketa Enderesova & Vladimir Sindelar
Cucurbit[6]uril (CB[6]) with a substituent attached solely to one methylene bridge was prepared for the first time. The monosubstituted CB[6] undergoes self-assembly to form a cyclic tetramer in the solid state. The affinity of the monosubstituted CB[6] to a series of alkylammonium salts was measured revealing a minor effect of the substituent on the binding properties of the macrocycle.

Modulation of Bambusuril Anion Affinity in Water

Vaclav Havel, Michal Babiak & Vladimir Sindelar
Abstract Neutral and negatively charged anion receptors functioning in pure water are rare in supramolecular chemistry. Moreover, studies on adjusting the affinity of such receptors toward anions i...

Glycoluril‐Derived Molecular Clips are Potent and Selective Receptors for Cationic Dyes in Water

Nengfang She, Damien Moncelet, Laura Gilberg, Xiaoyong Lu, Vladimir Sindelar, Volker Briken & Lyle Isaacs
Abstract Molecular clip 1 remains monomeric in water and engages in host–guest recognition processes with suitable guests. We report the Ka values for 32 1⋅guest complexes measured by 1H NMR, UV/Vi...

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