Motivic Milnor fiber of a quasi-ordinary hypersurface

Let f : (Cd+1, 0) -> (C, 0) be a germ of complex analytic function such that its zero level defines an irreducible germ of quasi-ordinary hypersurface (S, 0) subset of (Cd+1, 0). We describe the motivic Igusa zeta function, the motivic Milnor fibre and the Hodge-Steenbrink spectrum of f at 0 in terms of topological invariants of (S, 0) subset of (Cd+1, 0)

Motivic Milnor fiber of a quasi-ordinary hypersurface

Let $f$ be a germ of complex analytic function at $({\mathbf{C}}^{d+1}, 0)$ such that its zero level defines an irreducible germ of quasi-ordinary hypersurface $(S,0)$. We describe the motivic Igusa zeta function, the motivic Milnor fibre and the Hodge-Steenbrink spectrum of $f$ at 0 in terms of topological invariants of the quasi-ordinary hypersurface $(S,0)$

Log canonical thresholds of quasi-ordinary hypersurface singularities

The log canonical thresholds of irreducible quasi-ordinary hypersurface singularities are computed, using an explicit list of pole candidates for the motivic zeta function found by the last two authors

Partición de biomasa y nitrógeno en el cultivo de papa bajo tres tratamientos de fertilización nitrogenada

Nitrogen nutrition considerably influences the process of growing and producing potato crops. The aim of this study was to determine the effects of nitrogen nutrition on the pattern of biomass and nitrogen partitioning during the growth of potato crop in Mérida, Mérida, Venezuela. Experimental land plots were set, with a randomized blocks design, and with three different fertilization treatment settings for the "Granola" cultivar. The first one without nitrogen (0-N), the next one with 133 Kg N Ha-1 (133-N), and the last one with 400 Kg N Ha-1 (400-N). In the main phenological stages of the crop, biomass and nitrogen levels were measured for each organ. The performance of the tubers and the total biomass are strongly influenced by the availability of nitrogen and assimilatory biomass. The total biomass production, as well as the biomass and nitrogen partitioning to each organ, showed the following sequence: 400-N > 133-N > 0-N. However, biomass and nitrogen partitioning to the roots and stolons was higher in the treatment with limited nitrogen levels. Proportional changes among aboveground and belowground biomass are adaptive responses to nitrogen deficit conditions, which, in their turn, are determining factors in crop production

Effects of Forest Restoration Techniques on Community Diversity and Aboveground Biomass on Area Affected by Mining Tailings in Mariana, Southeastern Brazil

Currently there is an urgent and special attention in actions to restore tropical forests. In this study, we evaluated the effect of different restoration methods on aboveground biomass (AGB) stock, tree community diversity and structure, in areas affected by the Fundão tailings dam collapse in Mariana, Minas Gerais state, Brazil. We measured and compiled data of the AGB, community diversity and structure attributes in 36 plots distributed in six restoration treatments and six replicas: planting of native tree seedlings with fertilization and pH correction (PSf) and without fertilization and pH correction (PS); seeding of native trees with fertilization and pH correction (SDf) and without fertilization and pH correction (SD); natural regeneration with fertilization and pH correction (NRf) and without fertilization and pH correction (NR). No significant differences in substrate properties and AGB between treatments. Although biomass storage between treatments was not statistically different, there is a clear pattern showing higher values active restoration method. The Pielou index ranged from 0.520 (SDf) to 0.943 (NR), except for SDf all the others treatments had values higher than 0.76. This result suggests floristic heterogeneity, without ecological dominance in the plant community. Overall, active restoration had important implications for the forest restoration where natural regeneration is limited

Explorando el potencial alimenticio y nutricional de tres artrópodos amazónicos comestibles

Ensuring food supply and availability, and consequently food safety, on a global scale represents one of the most important challenges of this century. The exploitation of local resources such as invertebrates has been extremely relevant to contribute to food security. However, most research has focused on evaluating the nutritional potential of insects, with very few studies approaching other invertebrate groups. Three types of edible arthropods, the palm weevil larva (Rhynchophorus palmarum), the leaf-cutter ant (Atta laevigata), and the Goliath bird-eating spider (Theraphosa blondi) were studied in the Northern Amazon basin. Eight composite samples of each arthropod were collected and chemically analyzed following the procedures of the Associations of Official Analytical Chemists. Proximate composition analysis was performed to quantify moisture, crude fiber, protein, crude fat, and ash. The energy content was calculated by multiplying the mean values of crude protein by the Atwater factors. All three analyzed arthropod species have high nutritional potential compared with different types of insects and other invertebrates worldwide. Results of nutritional analysis on the three arthropods selected for this study revealed statistically significant differences in their chemical composition. Such values are similar to those of insects from orders Coleoptera and Hymenoptera, with variations of 1377% in protein amounts, 1066% in lipid amounts, and 90500 kcal/100 g in energy content per unit dry weight. We recommend that future research not only demonstrates the nutritional potential of edible arthropods, but also assesses the impact they have on food security.La disponibilidad de alimentos para garantizar la seguridad alimentaria a escala global, representa uno de los desafíos más importantes del presente siglo. Los recursos locales, como el aprovechamiento de invertebrados, han sido de mucha relevancia para contribuir con la seguridad alimentaria. Sin embargo, la mayoría de los estudios ha sido para evaluar el potencial alimentario de los insectos, y muy poco sobre otros grupos de invertebrados. Se estudiaron tres tipos de artrópodos comestibles, larvas de picudo de palma (Rhynchophorus palmarum), hormigas cortadoras de hojas (Atta laevigata) y arañas Goliat come pájaros (Theraphosa blondi) en el norte de la Amazonía. Se colectaron ocho muestras compuestas de cada tipo de artrópodo, y cada muestra se analizó químicamente de acuerdo con los procedimientos de la Associations of Official Analytical Chemists. En el análisis nutricional se determinó el contenido de agua, fibra bruta, proteína, grasa bruta y cenizas. El contenido energético se calculó multiplicando los valores medios de la proteína bruta. Las tres especies de artrópodos analizadas en este estudio tienen un alto potencial nutricional, en comparación con diferentes tipos de insectos y otros invertebrados en todo el mundo. Los resultados de los análisis nutricionales de los tres artrópodos seleccionados para este estudio revelaron diferencias estadísticamente significativas en su composición química. Tales valores son similares a los de los insectos de los órdenes Coleoptera e Hymenoptera, con variaciones de 13-77% en las cantidades de proteínas, 10-66% en las cantidades de lípidos, y 90-500 kcal / 100 g en el contenido de energía por unidad de peso seco. Recomendamos que las investigaciones futuras no sólo demuestren el potencial nutricional de los artrópodos comestibles, sino que también evalúen el impacto que tienen en la seguridad alimentaria.info:eu-repo/semantics/publishedVersio

Study on Site Preparation and Restoration Techniques for Forest Restoration in Mining Tailings of Mariana, Brazil

Ecological restoration in forest ecosystem is a priority in Mariana, Brazil. Thus, we evaluated the effects of passive and active restoration methods through different site preparation techniques by manipulating physical-chemical properties of substrates on tree community coverage in Mariana, Brazil. A total of 48 plots (12 × 12 m each) were established in two areas along the flood plains with accumulation of tailings. The following treatments were established: (1) planting of native tree seedlings with fertilization (PSf) and (2) without fertilization (PS); (3) direct seeding of native trees with fertilization (SDf) and (4) without fertilization (SD); (5) natural regeneration with fertilization (NRf) and (6) without fertilization (NR). Differences in substrate properties and tree community coverage were evaluated between treatments, the substrate properties and tree community coverage relationship, and main effects of substrate fertility and texture on tree community coverage. There were marked differences in substrate and plant coverage between treatments. On average, the highest plant coverage was found in treatment with fertilization, such as NRf (59,5%) and SDf (48%). However, the treatment with seedling planting (PSf and PS) and NR did not show differences (~37%), while the lowest values were observed in SD (23%). There is a strong relationship between substrate fertility and plant community coverage, with significant positive effects. We observed that the passive and active restoration methods can be complementary in the soil and plant community coverage recovery

Knowledge of oral cancer and preventive attitudes of Spanish dentists. Primary effects of a pilot educational intervention

Objective: To assess the knowledge and preventive attitudes that Spanish dentists have towards oral cancer, before and after an educational intervention. Methods: A quasi-experimental study based on a nationwide intervention. All Spanish dentists were offered an on-site course on oral cancer. An individual questionnaire was administered before and after attending the course. The main outcome measures were systematic examination of the oral cavity, promotion of healthy habits and knowledge of clinical aspects. Results: 440 GDPs entered the study. Age: 40.7±10.7, range 21-74. Professional experience: 13.9±8.9 years, range 0-45. Of those who participated in the study, 53.1% had never attended a course on oral cancer, 72.4% stated that they perform a systematic examination of the oral mucosa, 88.2% provided systematic counselling on tobacco cessation, and 54.7% reported that they did the same for alcohol. In addition, 32.3% advised patients to eat fruits and vegetables high in antioxidants. Professional experience was significantly associated with oral mucosa systematic examination (t= 2.9; p=0.003), advice on alcohol consumption (t=5.0; p=0.000), and on fruit and vegetable intake (t=5.1; p<0.001). None of these practices were specifically associated with knowledge on oral cancer. All areas of knowledge examined showed statistically significant improvement after the educational intervention. Conclusions: The intervention appears to have improved the GDP´s knowledge, confirming the importance of this national campaign