Bactérias diazotróficas em mudas de bananeira

Este trabalho objetivou selecionar bactérias diazotróficas isoladas de bananeira (Musa spp.) e avaliar sua influência no crescimento de mudas micropropagadas. Bactérias do tipo Herbaspirillum e relacionadas a Burkholderia cepacia foram inoculadas em plântulas de banana cv. Prata Anã e cv. Caipira. As bananeiras cv. Prata Anã, cultivadas in vitro com substrato pobre em N, apresentaram maior crescimento na presença de bactérias do tipo Herbaspirillum, ao passo que as bananeiras cv. Caipira cresceram melhor com o inóculo contendo bactérias do gênero Burkholderia. Em casa de vegetação, as bananeiras cv. Caipira crescidas em sacolas de plástico contendo areia e vermiculita (1:2), suplementada com a solução de Hoagland contendo 5 mg L-1 de N, apresentaram maior crescimento quando da inoculação simultânea dos dois gêneros de bactérias, em comparação à inoculação individual. A inoculação simultânea proporcionou um crescimento nas bananeiras equivalente ao observado nas plantas-controles adubadas com 50 mg L-1 de N no substrato, porém o teor e o acúmulo de N na parte aérea das bananeiras foram menores. A contribuição de bactérias diazotróficas no crescimento de bananeiras é demonstrada pela primeira vez.

Interactions of dietary whole-grain intake with fasting glucose- and insulin-related genetic loci in individuals of European descent: a meta-analysis of 14 cohort studies.

Whole-grain foods are touted for multiple health benefits, including enhancing insulin sensitivity and reducing type 2 diabetes risk. Recent genome-wide association studies (GWAS) have identified several single nucleotide polymorphisms (SNPs) associated with fasting glucose and insulin concentrations in individuals free of diabetes. We tested the hypothesis that whole-grain food intake and genetic variation interact to influence concentrations of fasting glucose and insulin. Via meta-analysis of data from 14 cohorts comprising ∼ 48,000 participants of European descent, we studied interactions of whole-grain intake with loci previously associated in GWAS with fasting glucose (16 loci) and/or insulin (2 loci) concentrations. For tests of interaction, we considered a P value <0.0028 (0.05 of 18 tests) as statistically significant. Greater whole-grain food intake was associated with lower fasting glucose and insulin concentrations independent of demographics, other dietary and lifestyle factors, and BMI (β [95% CI] per 1-serving-greater whole-grain intake: -0.009 mmol/l glucose [-0.013 to -0.005], P < 0.0001 and -0.011 pmol/l [ln] insulin [-0.015 to -0.007], P = 0.0003). No interactions met our multiple testing-adjusted statistical significance threshold. The strongest SNP interaction with whole-grain intake was rs780094 (GCKR) for fasting insulin (P = 0.006), where greater whole-grain intake was associated with a smaller reduction in fasting insulin concentrations in those with the insulin-raising allele. Our results support the favorable association of whole-grain intake with fasting glucose and insulin and suggest a potential interaction between variation in GCKR and whole-grain intake in influencing fasting insulin concentrations.

Rumuuden politiikka: sukupuoli, ruumis ja kansallisuuden rakentuminen 1900-luvun alun Suomessa

Abstract: Politics of ugliness: gender, body and the construction of nationality in early twentieth century Finland

Arsenic and heavy metal concentrations in agricultural soils in South Savo province

Selostus: Etelä-Savon viljelysmaan arseeni- ja raskasmetallipitoisuudet