94 research outputs found
Formation of Babassu in degraded areas by human action in southeast Para, Brazil : its importance for recovery of legal reserve areas
Importance of Treatment Process on the Analysis of Penicillins in Milk Samples by Capillary Electrophoresis
Fatores edáficos determinando a ocorrência de leguminosas herbáceas em savanas amazônicas
Fatores edáficos vem sendo indicados como determinantes para a distribuição de comunidades de plantas na AmazĂ´nia. O objetivo deste estudo foi investigar quais fatores edáficos determinam a ocorrĂŞncia de leguminosas herbáceas em savanas amazĂ´nicas. Para tanto, foi realizado um inventário da flora herbácea da famĂlia Leguminosae em 34 parcelas permanentes estabelecidas em duas áreas de savana de Roraima, norte da AmazĂ´nia brasileira. As espĂ©cies Chamaecrista desvauxii (24,9%), Aeschynomene histrix (15,7%) e Galactia jussiaeana (10,8%) foram as de maior Ăndice de valor de importância. Todas com grande abundância e ampla distribuição. Os resultados indicaram baixa densidade ou ausĂŞncia de indivĂduos e espĂ©cies em parcelas estabelecidas em solos mal drenados (hidromĂłrficos). Diversidade e riqueza de espĂ©cies tendeu a ser maior em habitats formados por solos bem drenados, mais fĂ©rteis e com menor concentração de alumĂnio trocável. É sugerido que solos pobres e sazonalmente alagados reduzam as chances de ocorrĂŞncia e afetem negativamente a riqueza/diversidade de leguminosas herbáceas nas áreas de savana de Roraima
Vitamin E-analog Trolox prevents endoplasmic reticulum stress in frozen-thawed ovarian tissue of capuchin monkey (Sapajus apella)
Ovarian fragments were exposed to 0.5 M sucrose
and 1 M ethylene glycol (freezing solution; FS) with or
without selenium or Trolox. Histological and ultrastructural
analyses showed that the percentages of normal follicles in
control tissue and in tissue after exposure to FS+50 ÎĽM
Trolox were similar. Trolox prevented endoplasmic reticulum
(ER)-related vacuolization, which is commonly observed in
oocytes and stromal tissue after exposure to FS. From the evaluated stress markers, superoxide dismutase 1 (SOD1)
was up-regulated in ovarian tissue exposed to FS+10 ng/ml
selenium. Ovarian fragments were subsequently frozenthawed
in the presence of FS with or without 50 ÎĽM Trolox,
followed by in vitro culture (IVC). Antioxidant capacity in
ovarian fragments decreased after freeze-thawing in Troloxfree
FS compared with FS+50 ÎĽMTrolox. Although freezing
itself minimized the percentage of viable follicles in each solution, Trolox supplementation resulted in higher rates of
viable follicles (67 %), even after IVC (61 %). Furthermore,
stress markers SOD1 and ERp29 were up-regulated in ovarian
tissue frozen-thawed in Trolox-free medium. Relative mRNA
expression of growth factors markers was evaluated after
freeze-thawing followed by IVC. BMP4, BMP5, CTGF,
GDF9 and KL were down-regulated independently of the
presence of Trolox in FS but down-regulation was less pronounced
in the presence of Trolox. Thus, medium supplementation
with 50 ÎĽMTrolox prevents ER stress and, consequently,
protects ovarian tissue from ER-derived cytoplasmic
vacuolization. ERp29 but not ERp60, appears to be a key
marker linking stress caused by freezing-thawing and cell
vacuolization.http://link.springer.com/journal/441hb201
Biologia floral e sistema reprodutivo de Byrsonima coccolobifolia (Kunth) em uma savana amazĂ´nica
Among and within family selection and combined half-sib family selection in Panicum maximum Jacq.
Decisional conflict in breast cancer patients considering immediate breast reconstruction
Background: Breast cancer (BC) patients who are treated with mastectomy are frequently offered immediate breast reconstruction. This study aimed to assess decisional conflict in patients considering immediate breast reconstruction, and to identify factors associated with clinically significant decisional conflict (CSDC). Methods: Baseline data of a multicenter randomized controlled trial evaluating the impact of an online decision
Transitions of cardio-metabolic risk factors in the Americas between 1980 and 2014
Describing the prevalence and trends of cardiometabolic risk factors that are associated with non-communicable diseases (NCDs) is crucial for monitoring progress, planning prevention, and providing evidence to support policy efforts. We aimed to analyse the transition in body-mass index (BMI), obesity, blood pressure, raised blood pressure, and diabetes in the Americas, between 1980 and 2014
- …