Insectos plaga del arroz en Loreto, Amazonia peruana

The rice is extensively cultivated on the bank of the Ucayali River in the Peruvian Amazonia. Some plantations have been visited and sampled to make an inventory of the phytofagous insects of this crop. Fifteen species of pests of rice are reported. Three of them are considered as potentially dangerous for the rice in this region : #Diatraea saccharalis F., #Oebaleus poecilus Dallas and #Tibraca limbativentris$ Stal. (Résumé d'auteur

Datasets for online controlled experiments

Online Controlled Experiments (OCE) are the gold standard to measure impact and guide decisions for digital products and services. Despite many methodological advances in this area, the scarcity of public datasets and the lack of a systematic review and categorization hinder its development. We present the first survey and taxonomy for OCE datasets, which highlight the lack of a public dataset to support the design and running of experiments with adaptive stopping, an increasingly popular approach to enable quickly deploying improvements or rolling back degrading changes. We release the first such dataset, containing daily checkpoints of decision metrics from multiple, real experiments run on a global e-commerce platform. The dataset design is guided by a broader discussion on data requirements for common statistical tests used in digital experimentation. We demonstrate how to use the dataset in the adaptive stopping scenario using sequential and Bayesian hypothesis tests and learn the relevant parameters for each approach

Observations préliminaires sur les insectes nuisibles à l'araza (Eugenia stipitata McVaugh, Myrtaceae), nouvelle culture fruitière en Amazonie

L'araza (#Eugenia stipitata McVaugh, #Myrtaceae) est un arbuste fruitier amazonien récemment domestiqué, qui présente un fort potentiel agro-industriel. Afin d'inventorier les insectes nuisibles, des évaluations ont été entreprises entre 1988 et 1992 dans les plantations de trois centres de recherche et dans deux plantations privées, proches d'Iquitos, en Amazonie péruvienne. Neuf espèces nuisibles ont été identifiées dont cinq affectent les fruits, trois sont des défoliateurs et la dernière coupe les rameaux. Quatre de ces espèces sont considérées comme nuisibles : #Anastrepha obliqua, #Conotrachelus eugeniae et #Atractomerus immigrans, qui influent sur la qualité et le volume des fruits récoltés ainsi que #Plectrophoroides impressicollis qui peut détruire totalement les inflorescences. (Résume d'auteur

Notas sobre los artropodos que viven en el pijuayo (Bactris gasipaes H.B.K. : Palmae) en la Amazonia peruana

The peachpalm, #Bactris gasipaes$ H.B.K. is cultivated in the Amazon basin and in Central America for its fruits and for the production of heart palm. Several insects and mites attack it. Some observations in Peruvian Amazonia on those pests and other associated insects are reported. Some species are new for Peru. (Résumé d'auteur

Los insectos plaga del camu camu (Myrciaria dubia H.B.K.) y del araza (Eugenia stipitata Mc Vaugh) identificacion y control

Le camu camu (#Myrciaria dubio H.B.K.) et l'araza (#Eugenia stipitata Mc Vaugh) sont des cultures nouvelles en Amazonie péruvienne. Dans ce travail sont citées 21 espèces d'insectes nuisibles au camu camu, parmi lesquelles 6 espèces doivent être considérées comme des ravageurs économiquement importants, ce sont : #Austrotachardiella sp, #Ceroplastes sp., #Conotrachelus sp.1., #Dysmicoccus brevipes Cock, #Tuthillia cognata Hodk. y #Xylosandrus compactus Heichh. Sur araza 9 espèces ont été répertoriées, dont 4 sont des ravageurs importants : #Anastrepha obliqua Macq., #Atractomerus immigrans Clark, #Conotrachelus sp. 2 y #Plectrophoroides impressicollis Chevr. Quelques espèces nouvelles pour la science ont été décrites récemment ou sont en cours d'étude. On donne les premières informations sur les espèces dont la biologie et l'écologie n'étaient pas connues, ainsi que des méthodes de contrôle adaptées au système de gestion des plantations. (Résumé d'auteur

Revision in the first steps of the biosynthesis of the red antibiotic prodigiosin: use of a synthetic thioester to validate a new intermediate.

Funder: Frances and Augustus Newman FoundationFunder: Emmanuel College, University of CambridgeFunder: Cambridge Commonwealth TrustA biosynthetic pathway for the red-antibiotic, prodigiosin, was proposed over a decade ago but not all the suggested intermediates could be detected experimentally. Here we show that a thioester that was not originally included in the pathway is an intermediate. In addition, the enzyme PigE was originally described as a transaminase but we present evidence that it also catalyses the reduction of the thioester intermediate to its aldehyde substrate

Noninvasive rapid detection of metabolic adaptation in activated human T lymphocytes by hyperpolarized ¹³C magnetic resonance.

The metabolic shift induced in human CD4 <sup>+</sup> T lymphocytes by stimulation is characterized by an upregulation of glycolysis, leading to an augmentation in lactate production. This adaptation has already been highlighted with various techniques and reported in several previous studies. We herein propose a method to rapidly and noninvasively detect the associated increase in flux from pyruvate to lactate catalyzed by lactate dehydrogenase using hyperpolarized <sup>13</sup> C magnetic resonance, a technique which can be used for in vivo imaging. It was shown that the conversion of hyperpolarized <sup>13</sup> C-pyruvate to <sup>13</sup> C-lactate during the one-minute measurement increased by a mean factor of 3.6 in T cells stimulated for 5 days as compared to resting T cells. This method can be extended to other metabolic substrates and is therefore a powerful tool to noninvasively analyze T cell metabolism, possibly in vivo