Cisbio (France)

The leafhopper fauna of the Iberian Peninsula is the least studied in Europe. Recent surveys in agroecosystem areas of southern Spain, specifically in Andalusia, aimed to identify potential Auchenorrhyncha vectors of the bacterium Xylella fastidiosa. During these surveys, three previously unrecorded species of Cicadellidae belonging to the subfamily Deltocephalinae have been discovered. These newly recorded species are Balclutha incisa (Matsumura), Cicadulina (Cicadulina) bipunctata (Melichar), and Maiestas angustisecta (Linnavuori). Generally, these species were previously only known from American, African and eastern Palaearctic regions. This work is the first to record these species on the European mainland. Detailed descriptions of adult specimens have been provided, along with information on their current distribution and host plants. The potential role of these leafhoppers as potential vectors of plant pathogens is discussed, highlighting their importance in agroecosystems.

Abstract Within the Mesoamerican biodiversity hotspot, Costa Rica shows high species richness, due to its biogeographical, tectonic and climatic history. Small mammals (i.e. species of less than 500 grams) are a very diverse group in Costa Rica with about 52 native species. This high diversity, recent records of new species and molecular studies detecting cryptic genetic diversity highlight this group and this region as an important target for the DNA barcoding approach. Here we used 131 tissue samples across multiple localities in Costa Rica and sequenced the complete mitochondrial cytochrome b (1140 bp). These samples represented 17 recognized species (including Didelphis marsupialis, which is technically not a small mammal) and two taxa of uncertain status. The new sequence data were supplemented with previously published data from INSDC. Our phylogenetic analyses are consistent with and extend upon recent revisions in Heteromys, Peromyscus and Reithrodontomys and suggest possible new cryptic forms within what are currently named Melanomys chrysomelas, Nyctomys sumichrasti and Proechimys semispinosus. The previously named “Heteromys sp” is indeed likely a new species requiring a full taxonomic description. Our results suggest the continuity of previously described species at our newly described localities in Costa Rica reinforcing recent taxonomic surveys and field guides for the small mammals of Costa Rica. To confirm the presence of cryptic species and major genetic forms in Heteromys, Peromyscus, Reithrodontomys, Melanomys, Nyctomys and Proechimys there needs to be greater sampling, additional genetic markers, morphometrics and other studies. Scotinomys also shows interesting phylogenetic subdivision, requiring further investigation.

Molecule rotation in the control of fungal diseases is essential to ensure sustainability and avoid the tolerance of pathogens to fungicides. Evidencing managements that promote greater efficiency in the control can contribute to increase the efficiency in the control of diseases.This work aims to reveal control alternatives for foliar diseases through different anti-fungal molecules applied in pre-flowering in the linseed crop. The experiment took place in the experimental area of Escola Fazenda, UNIJUÍ, located in the municipality of Augusto Pestana (RS). The experimental design used randomized blocks, with ten fungicide treatments in foliar application and three replications, totaling 30 experimental units. In the useful area of ​​each experimental unit, the following characteristics were measured: plant height, plants per square meter, number of grains per plant, weight of grains per plant, grain yield, normalized green red difference index, green leaf index, spectral saturation index. The data obtained were submitted to descriptive analysis and to the assumptions of analysis of variance, such as homogeneity of residual variances by Bartlett's test and normality of errors by Shapiro Wilk. Afterwards, analysis of variance was carried out at 5% probability, with the significant variables, Tukey's test of multiple comparison of means was applied at the level of 5% of probability. In order to identify the tendency of association between the characters, Pearson's linear correlation was determined at 5% probability by t test. The active ingredient Pyraclostrobin + Fluxapyroxad can contribute favorably to the maintenance of floral units, capsules and grains per plant. The correct positioning of the use of the molecule is decisive and requires further studies in linseed culture.

In this work, the development of highly luminescent europium(III) complexes in water solution is reported, including their syntheses, analyses of their photophysical properties and applications in bioassays. Three Eu(III) complexes are derived from new ligands based on a tripyridinophane platform. There are four distinct sections in the structure of these ligands: an 18-membered polyaminocarboxylic macrocycle to bind efficiently lanthanide ions in aqueous solutions, three chromophoric subunits (4-(phenylethynyl)pyridine moieties) to effectively sensitize the emission of the metal, two peripheral moieties to solubilise the complex in aqueous media (sulfonate, sulfobetaine or glucose groups) and a free NH2 group available for grafting or bioconjugation. In our synthetic procedure, a pivotal macrocyclic platform is obtained with a high yield in the crucial macrocyclization step due to a metal template ion effect (74% yield). In Tris aqueous buffer (pH 7.4), the Eu(III) complexes show a maximum excitation wavelength at 320 nm, a suitable overall quantum yield (14%), a relatively long lifetime (0.80 ms) and a one-photon brightness in the range of 10 000 M-1 cm-1. Importantly, these photophysical properties are retained at dilute concentrations, even in the presence of a very large excess of potentially competing species, such as EDTA or Mg2+ ions. Furthermore, we report the bioconjugation of a Eu(III) complex labelled by an N-hydroxysuccinimide ester reactive group with an antibody (anti-glutathione-S-transferase) and the successful application of the corresponding antibody conjugate in the detection of GST-biotin in a fluoroimmunoassay. These new complexes provide a solution for high sensitivity in Homogeneous Time-Resolved Fluorescence (HTRF®) bioassays.

The relative sensitivities of structurally related Eu(III) complexes to quenching by electron and energy transfer processes have been compared. In two sets of 9-coordinate complexes based on 1,4,7-triazacyclononane, the Eu emission lifetime decreased as the number of conjugated sensitising groups and the number of unbound ligand N atoms increased, consistent with photoinduced electron transfer to the excited Eu(III) ion that is suppressed by N-protonation. Quenching of the Eu 5D0 excited state may also occur by electronic energy transfer, and the quenching of a variety of 9-coordinate complexes by a cyanine dye with optimal spectral overlap occurs by an efficient FRET process, defined by a Förster radius (R0) value of 68 Å and characterised by second rate constants in the order of 109 M-1 s-1; these values were insensitive to changes in the ligand structure and to the overall complex hydrophilicity. Quenching of the Eu and Tb excited states by energy transfer to Mn(II) and Cu(II) aqua ions occurred over much shorter distances, with rate constants of around 106 M-1 s-1, owing to the much lower spectral overlap integral. The calculated R0 values were estimated to be between 2.5 to 4 Å in the former case, suggesting the presence of a Dexter energy transfer mechanism that requires much closer contact, consistent with the enhanced sensitivity of the rate of quenching to the degree of steric shielding of the lanthanide ion provided by the ligand.

Abstract Higher air temperatures and drier conditions may create stronger water vapour pressure and increase rates of cutaneous water loss, while elevated body temperatures may in turn directly speed up metabolic rates that lead to higher respiratory water loss. Therefore, water budgets are an important organismal trait for understanding their responses to climate change. The most common method of water loss estimation combines respiratory and cutaneous pathways by measuring body weight loss over a defined period of time. Currently, obtained values are often summed or averaged for population or species comparisons. We warn about potential statistical problems using average or summed values of water loss due to emerging temporal patterns. In this study we used a model dataset of lizards and to investigate temporal patterns in water loss datasets. We found that temporal patterns strongly vary across datasets and often deviate from the summed/average profile. Also, the duration of the experiment needs to remain long enough to detect the temporal patterns and produce representative results, while averages at different end-points of the experiment will also vary with temporal patterns. We propose that a simple statistical approach including hour of the experiment as non-linear explanatory variable in GAMM is used to investigate and adequately account for temporal patterns, which will ensure comparability of studies using meta-analyses in the future. Found signal of temporal variation in water loss also suggests that it holds significant biological relevance, potentially mostly connected to behavioural but also physiological adjustments and needs research attention in the future.

As key regulators of the actin cytoskeleton, RHO GTPase expression and/or activity are deregulated in tumorigenesis and metastatic progression. Nevertheless, the vast majority of experiments supporting this conclusion was conducted on cell lines but not on human tumor samples that were mostly studied at the expression level only. Up to now, the activity of RHO proteins remains poorly investigated in human tumors. In this article, we present the development of a robust nanobody-based ELISA assay, with a high selectivity that allows an accurate quantification of RHO protein GTP-bound state in the nanomolar range (1 nM; 20 μg/L), not only in cell lines after treatment but also in tumor samples. Of note, we present here a fine analysis of RHOA-like and RAC1 active state in tumor samples with the most comprehensive study of RHOA-GTP and RHOC-GTP levels performed on human breast tumor samples. We revealed increased GTP-bound RHOA and RHOC protein activities in tumors compared to normal tissue counterparts, and demonstrated that the RHO active state and RHO expression are two independent parameters among different breast cancer subtypes. Our results further highlight the regulation of RHO protein activation in tumor samples and the relevance of directly studying RHO GTPase activities involvement in molecular pathways.

Kunst und Wissenschaft Inspiriert von Dalis “Die Beständigkeit der Erinnerung” repräsentieren die drei Uhren im Bild das Prinzip dieser Studie, mit drei zeitlichen optischen Detektionsfenstern, die für eine RGB-Kodierung (rot, grün, blau) genutzt wurden. Gezeigt sind eine Nanopartikelanordnung (orange Uhr, von Ameisen bedeckt im Original) links unten, ein Mikroskopobjektiv (das “Monster” im Original) in der Mitte (unter der blauen Uhr) und ein Mikroskopträger mit roten, grünen und blauen Zellen (die Plattform im Original) oben links. Mehr dazu in der Zuschrift von L. Huang, N. Hildebrandt et al. auf S. 13876.

Abstract Fluoreszenzstrichkodierung mittels Nanopartikeln bietet viele Vorteile für die Multiparameter‐Mikroskopie. Es ist jedoch extrem schwierig, verschiedene konzentrationsunabhängige Codes zu erstellen, ohne verschiedene Nanopartikel zu mischen und Anregung und Emission einer einzelnen Wellenlänge für die zelluläre Multiplex‐Bildgebung zu verwenden. Hier berichten wir über die Entwicklung von Quantenpunkten (quantum dots: QDs) mit zwei unterschiedlichen SiO2‐Schalenstärken (6 und 12 nm), die mit zwei verschiedenen Lanthanoidkomplexen (Tb und Eu) beschichtet sind. FRET von Tb‐ oder Eu‐Donoren auf QD‐Akzeptoren führte zu vier unterschiedlichen Photolumineszenz(PL)‐Abklingkurven, die durch einfache zeitgetaktete (time‐gated: TG) PL‐Intensitätsdetektion in drei individuellen temporalen Detektionsfenstern kodiert wurden. Die wohldefinierten Einzelnanopartikel‐Codes wurden für die Lebendzellen‐Mikroskopie und die Unterscheidung von vier verschiedenen Zellen in einem einzigen Sichtfeld mittels einer Messung verwendet. Diese Einzelfarben‐Strichkodierungsstrategie eröffnet neue Möglichkeiten für die Multiplexmarkierung und Verfolgung von Zellen.