Categorification of persistent homology

We redevelop persistent homology (topological persistence) from a categorical point of view. The main objects of study are diagrams, indexed by the poset of real numbers, in some target category. The set of such diagrams has an interleaving distance, which we show generalizes the previously-studied bottleneck distance. To illustrate the utility of this approach, we greatly generalize previous stability results for persistence, extended persistence, and kernel, image and cokernel persistence. We give a natural construction of a category of interleavings of these diagrams, and show that if the target category is abelian, so is this category of interleavings.Comment: 27 pages, v3: minor changes, to appear in Discrete & Computational Geometr

Graphic-based concept retrieval

Two ways of expressing concepts in the context of image retrieval are presented. One, Keypics, is on the side of an image owner, who wants the image itself to be found on the Web; the second, Trittico, is on the side of the image searcher. Both are based on the paradigm of human intermediation for overcoming the semantic gap. Both require tools capable of qualitative analysis, and have been experimented by using persistent homology

Impact of the \u3cem\u3eBrachiaria\u3c/em\u3e Hybrids on Both Soil Health and Carbon Stock on Livestock Production

Pastures occupy 30% of Earth and 80% of the entire agricultural area of the planet. To ensure food to the world and contribute to the quality of the environment, pasture-based animal production systems will also have to undergo through a more intense evolution. The intensification of tropical grasslands is an important strategy of land utilization in developing countries, contributing to increase production and minimize environmental impact through the best management practices. In this sense, the use of Brachiaria hybrids represents an excellent option, since combining the best traits of different Brachiaria species, with higher nutritive value, forage, and seed yield. Here we have evaluated six Brachiaria hybrids’ effects on both soil health and carbon stock. We observed that in all Brachiaria genotypes the mean carbon stock varied significantly in at least two soil depth categories. In general, carbon stock tends to get smaller as soil depth increases. Enzyme activity analysis showed there were no significant differences in the mean enzyme activity except in hybrid GP 3660 for β-glucosidase enzyme. Therefore, the adoption of Brachiaria hybrids might also help farmers to produce in an environmentally friendly manner, due to the potential benefits of Brachiaria to soil life enzyme activity and carbon mitigation

Differential impacts of pesticides on Euschistus heros (Hem.: Pentatomidae) and its parasitoid Telenomus podisi (Hym.: Platygastridae).

Made available in DSpace on 2019-08-27T01:04:09Z (GMT). No. of bitstreams: 1 JoseFranciscomartinss41598019429754.pdf: 1369398 bytes, checksum: 2b23ded0676edce666f4c0f480cfb47b (MD5) Previous issue date: 2019bitstream/item/201294/1/Jose-Francisco-martins-s41598-019-42975-4.pd

Grade de agrotóxicos do kiwi.

Documento integra a série Documentos do Kiwi, que tem como finalidade dar subsídios à aplicação do Programa de Boas Práticas Agricolas (BPA) para a cultura, possibilitando a obtenção de produtos seguros, com qualidade e de menor impacto ambiental possível.bitstream/item/223197/1/ComTec-218-Online-2021.pd

Insecticidal Gene Silencing by RNAi in the Neotropical Region.

Insecticidal gene silencing by RNA interference (RNAi) involves a post-transcriptional mechanism with great potential for insect control. Here, we aim to summarize the progress on RNAi research toward control of insect pests in the Neotropical region and discuss factors determining its efficacy and prospects for pest management. We include an overview of the available RNAi information for Neotropical pests in the Lepidoptera, Coleoptera, Diptera, and Hemiptera orders. Emphasis is put on significant findings in the use of RNAi against relevant Neotropical pests, including diamondback moth (Plutella xylostella L.), Asian citrus psyllid (Diaphorina citri Kuwayama), and the cotton boll weevil (Anthonomus grandis Boheman). We also examine the main factors involved in insecticidal RNAi efficiency and major advances to improve screening of lethal genes, formulation, and delivery. Few studies detail resistance mechanisms to RNAi, demonstrating a need for more research. Advances in formulation, delivery, and resistance management tools for insecticidal RNAi in the Neotropics can provide a basis for efficient field application