The role of life history traits in mammalian invasion success

Why some organisms become invasive when introduced into novel regions while others fail to even establish is a fundamental question in ecology. Barriers to success are expected to filter species at each stage along the invasion pathway. No study to date, however, has investigated how species traits associate with success from introduction to spread at a large spatial scale in any group. Using the largest data set of mammalian introductions at the global scale and recently developed phylogenetic comparative methods, we show that human-mediated introductions considerably bias which species have the opportunity to become invasive, as highly productive mammals with longer reproductive lifespans are far more likely to be introduced. Subsequently, greater reproductive output and higher introduction effort are associated with success at both the establishment and spread stages. High productivity thus supports population growth and invasion success, with barriers at each invasion stage filtering species with progressively greater fecundity.

Miljöinformation för barn

Ett projektarbete i samarbete Hold Norge Rent, Norsk Resirk och Skiskolenes bransjeførbund i syfte att skapa enkel, intressant och lättförståelig miljöinformation för barn som är på semester i de Norskafjällen. Information bestående av en 12-sidig målarbok med miljövännerna Truls, Trude, Älgen Egiloch Haren Harald tillsammans med ett antal hjälpsamma lämmlar. Tillsammans lär de sig hur man sorterar sopor. I tillägg finns en frågesport med elva frågor om sopsortering, en samlingsplatsskylt och ett diplom. Alla illustrationer är gjorda efter samma manér, detta för att ge hela konceptet ett enhetligt intryck. Fördjupningen handlar om pedagogiska illustrationer för barn. Focus har lagts på barns bildförståelse och hur de tolkar och uppfattar illustrationer.

Överlämningar från förskola till förskoleklass

Syftet med studien var att synliggöra verksamma förskollärares erfarenheter av överlämning från förskola till förskoleklass. Ett antagande var att överlämningen, för att gynna kontinuitet och långsiktighet, behöver fokusera barns lärande inom målområden som styrdokumenten anger för förskolans verksamhet. Empirisk data samlades in genom en kombination av frågeformulärmetod och intervjumetod. 36 förskollärare i förskolan och 38 förskollärare i förskoleklassen besvarade en enkät, medan 4 förskollärare i respektive verksamhet intervjuades. Analysen genomfördes abduktivt genom att studiens teoretiska utgångspunkter och frågeställningar utgjorde grund för teman som identifierades i det empiriska materialet. Studien visar att det genomförs överlämningar mellan verksamheterna. Dessa görs för att ge barnen en trygg övergång snarare än för att gynna kontinuerligt och långsiktigt lärande inom angivna målområden. Omsorg om barnen och föreställningar om skolformernas verksamhet ger avtryck på agerande och ställningstagande i överlämningarna. I artikeln diskuteras professionell bedömning av barns lärande samt behovet av ökad samsyn inom förskola och förskoleklass vad gäller enskilda barns lärande inom olika områden. 

Särskilt begåvade elever : En litteraturstudie om hur lärare kan identifiera elever med särskild begåvning i matematik

Denna systematiska litteraturstudie har syftet att ta reda på vad tidigare forskning säger om hur lärare kan identifiera elever med en särskild begåvning i matematik. Hur dessa elever utmärker sig och vad som är deras kännetecken samt egenskaper. Hur lärare kan arbeta för att synliggöra dessa egenskaper för att kunna identifiera elever med särskild begåvning i matematik. För att besvara studiens frågeställning har en systematisk litteraturstudie använts vilket innebär att svaret sökts i tidigare forskning. Denna systematiska litteraturstudie har hämtat litteratur som behandlar forskningsområdet från databaserna Eric, Summon och Libris. Resultatet av studien visar att de särskilt begåvade eleverna kan identifieras genom elevernas enskilda arbete, prov och tester samt muntlig kommunikation. I identifieringen måste lärarna vara medvetna om att egenskaperna kan skilja sig åt mellan de särskilt begåvade eleverna. Eleverna kan identifieras genom egenskaper som att de är snabba, nyfikna, positiva och engagerande. Det är en fördel i

Avaliação do padrão socieconômico como indicador do perfil do consumo de mídia na sociedade brasileira

Este trabalho estuda o comportamento do consumo dos principais meios de mídia na sociedade brasileira, investigando se ele está relacionado à classe social de um indivíduo. Sendo assim, foi feito um levantamento teórico sobre consumo de mídia, classes sociais e comportamento do consumidor. Posteriormente, são estudados quais outros fatores, além da classe social, influenciam no padrão do consumo de mídia, a partir de uma análise de correspondência. Para isso, são examinadas características sociais, demográficas e comportamentais das amostras de indivíduos que consomem cada mídia. Ademais, a análise de correspondência também permite examinar o poder das variáveis estudadas em cada meio como influenciador na decisão de compra, conforme mostra a teoria do comportamento do consumidor.

A participação nos lucros ou resultados e as contribuições previdenciárias: uma análise da jurisprudência do Conselho Administrativo de Recursos Fiscais

O trabalho tem como objeto o estudo de temas específicos relacionados à Participação dos trabalhadores nos Lucros ou Resultados (PLR) empresariais, tais como a periodicidade do pagamento, do pagamento de PLR a somente algumas áreas da empresa e das regras claras e objetivas sobre a forma do acordo celebrado entre empregado e empregador. A matéria será introduzida por meio do exame da controvérsia constitucional acerca da auto aplicabilidade do art. 7°, XI, da Constituição Federal de 1988, questão que é objeto do Recurso Extraordinário n° 569.441-RS, cuja repercussão geral foi recentemente reconhecida pelo Supremo Tribunal Federal (STF) e que ainda está pendente de julgamento. Após breve histórico sobre a legislação que regulamenta a PLR, por meio da análise prática da jurisprudência do Conselho Administrativo de Recursos Fiscais (CARF), será apresentado o entendimento do tribunal acerca de temas controvertidos existentes na legislação (Lei n 10.101/2000) que regulamenta a matéria.

Avaliação da atividade antioxidante e antiproliferativa do extrato aquoso de frutas tropicais

The antioxidant activity of aqueous extracts of five edible tropical fruits (Spondias lutea, Hancornia speciosa, Spondias purpurea, Manilkara zapota and Averrhoa carambola) was investigated using different methods. The amount of phenolic compounds was determined by the Folin-Ciocalteu reagent. The M. zapota had Total Antioxidant Capacity (TAC) higher than the other fruits. Extracts showed neither reducing power nor iron chelation (between 0.01 and 2.0 mg/mL). H. speciosa exhibited the highest superoxide scavenging activity (80%, 0.5 mg/mL). However, at high concentrations (8.0 mg/mL) only A. carambola, S. purpurea and S. lutea scavenging 100% of radicals formed. M. zapota and S. purpurea had higher phenolic compound levels and greater OH radical scavenging activity (92 %, 2.0 mg/mL). Antiproliferative activity was assessed with 3T3 fibroblasts and cervical tumor cells (HeLa). The most potent extract was S. purpurea (0.5 mg/mL), which inhibited HeLa cell proliferation by 52%. The most fruits showed antioxidant and antiproliferative properties, characterizing them as functional foods.

Síntese e caracterização de redes metalorgânicas baseadas em zinco e ácidos benzenodicarboxílicos

Metal Organic Frameworks (MOFs) are supramolecular structures consisted of ions or metal clusters coordinated to organic ligands which are repeated in two or three dimensions. These structures have atracted much attention due to their properties such as low density, high specific surface area and large volume of pores. In this work, MOFs consisted of zinc clusters connected by ditopic ligands, terephthalic acid (1,4- H2BDC) or isophthalic acid (1,3-H2BDC) were synthesized. To obtain the proposed materials, different routes and synthetic parameters were tested, such as the molar ratio of the precursors, the addition of template molecules, the type of solvente, the addition of organic base or the type of a counter-ion of Zn salt. It was found that the variation of these parameters led to the formation of different metalorganic structures. The solids obtained were characterized by XRD, SEM and IR. For the samples identified as MOF- 5, it was verified that the structure was composed of both interpenetrated and non interpenetrated structures. These samples showed a low stability, becoming totally transformed into another structure within less than 72 hours. The addition of the nickel and/or cobalt was found to be a promissing method for increasing the stability of MOF- 5, which in this case, still remained unconverted to another structure even after 15 days of exposure to air. The samples prepared from 1,3-H2BDC were probably new, still unknown Metal Organic Frameworks

Immunohistochemical evaluation of Ki-67 and PCNA in canine mammary neoplasias: Correlation with prognostic factors and clinical outcome

E-cadherin is a cell-cell adhesion molecule and low e-cadherin expression is related to invasiveness and may indicate a bad prognosis in mammary neoplasms. The expression of cell proliferation markers PCNA and especially Ki-67, has also proved to have a strong prognostic value in this tumor class. The expression of these markers was related to the clinical-pathological characteristics of 73 surgically removed mammary tumors in female dogs by immunohistochemistry. There was no statistical correlation between these markers and death by neoplasm, survival time and disease-free interval. However, the loss of e-cadherin expression and marked Ki-67 expression (p=0.016) were considered statistically significant for the diagnosis (p=0.032). When evaluated as independent factors, there was evidence of the relationship between the loss of e-cadherin expression and high PCNA expression with changes in the body status (divided into obese, normal and cachectic) of female dogs (p=0.030); there was also evidence of the relationship between pseudopregnancy and e-cadherin alone (p=0.021) and for ulceration and PCNA alone (p=0.035). The significant correlation between the markers expression and these well known prognostic factors used individually or in combination suggests their prognostic value in canine mammary tumors.

Metabolic acidosis in healthy mules under general anaesthesia with halothane

Objective To report the severe metabolic acidosis identified in a group of 11 healthy mules anaesthetized with halothane for castration.Study design Data generated from a prospective study.Animals Eleven mules aged 2.5-8 years, weighing 230-315 kg and 11 horses aged 1.5-3.5 years, weighing 315-480 kg.Methods Animals were anaesthetized for castration as part of an electroencephalographic study. Preanaesthetic medication was acepromazine (0.03 mg kg(-1)) administered through a preplaced jugular venous catheter. Anaesthesia was induced 30-90 minutes later with intravenous thiopental (10 mg kg(-1)). After orotracheal intubation, anaesthesia was maintained with halothane vaporised in oxygen. The animals' lungs were ventilated to maintain the end-tidal CO(2) concentration between 3.9 and 4.5 kPa (29-34 mmHg). Anaesthetic monitoring included invasive blood pressure measurement via the auricular artery (mules) and submandibular branch of the facial artery (horses). Arterial blood gas samples were drawn from these catheters at three time points during surgery and pH, PaCO(2), base excess (ecf) and HCO(3)(-) were measured. Values were compared between groups using a Mann-Whitney test. p was taken as <0.05. Results are reported as median (range).Results PaCO(2) did not differ between groups but pH was significantly lower in mules [7.178 (7.00-7.29)] compared to horses [7.367 (7.24-7.43)] (p = 0.0002). HCO(3)(-) values were significantly lower in the mules [16.6 (13.0-22.3) mM] compared to horses [23.7 (20.9-23.7) mM] (p = 0.0001), whilst base excess (ecf) was significantly more negative in the mules [-11.4 (-1.27 to -16) mM] compared to horses [-1.3 (-5.8 to +2.4) mM] (p = 0.0004).Conclusion and clinical relevance This study demonstrated severe metabolic acidosis in healthy mules, which may have prompted intervention with drug therapies in a clinical arena. It is probable that the acidosis existed prior to anaesthesia and caused by diet, but other possible causes are considered.