4,442 research outputs found
Five new species of the genera Heerz Marsh, Lissopsius Marsh and Ondigus Braet, Barbalho and van Achterberg (Braconidae, Doryctinae) from the Chamela-Cuixmala biosphere reserve in Jalisco, Mexico
Five new species belonging to the poorly known Neotropical doryctine parasitoid wasps genera Heerz Marsh (H. ecmahla sp. n. and H. macrophthalma sp. n.), Lissopsius Marsh (L. pacificus sp. n. and L. jalisciensis sp. n.) and Ondigus Braet, Barbalho & van Achterberg (O. cuixmalensis sp. n.) are described from the Chamela-Cuixmala Biosphere reserve in Jalisco, Mexico. Keys to the described species of the above three genera are provided. The phylogenetic placement of the examined taxa is investigated based on mitochondrial (COI) and nuclear (28S, 2nd and 3rd domain regions) DNA sequence data.Fil: Zaldivar Riverón, Alejandro. Universidad Nacional Autónoma de México; MéxicoFil: Martinez, Juan Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”; Argentina. Universidad Nacional Autónoma de México; MéxicoFil: Ceccarelli, Fadia Sara. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”; Argentina. Universidad Nacional Autónoma de México; MéxicoFil: Shaw, Scott R.. University of Wyoming; Estados Unido
Effects of Ponderosa Pine Ecological Restoration on Forest Soils and Understory Vegetation in Northern Arizona
The human exclusion of wildfire and overgrazing by livestock since settlement have caused dramatic changes in ponderosa pine (Pinus ponderosa Dougl ex Laws) forest ecosystems. These changes include increased numbers of tree stems, reduced understory cover and diversity, and the introduction of invasive, non-native understory species. This study evaluated the coverage and species composition of understory vegetation present in the “cool-season” (late spring and early summer) in a ponderosa pine forest on grazed and ungrazed plots that had undergone restoration treatments on three different soil/geologic parent material types near Flagstaff, Arizona, twelve years after tree thinning and grazing exclosure treatments were applied. Several measured soil properties, such as soil respiration and temperature, were also evaluated in this study. Species richness of “cool-season” vegetation was influenced more by grazing practices than restoration treatments. Differences could be less or greater when vegetation that is active later in the season is measured. Vegetative cover was significantly influenced by restoration treatments (9.3% cover under open canopies and 6.5% under dense canopies), probably due to differences in competition for light and other resources (i.e. soil moisture and nutrients). Unlike finding by Abella et al. (2015), who studied “warm-season” vegetation, “cool-season” understory cover was not influenced by soil parent material type in this study, which might suggest that differences in understory cover due to soil properties are only seen shortly after restoration treatments are applied, or the time of year vegetation is evaluated may play a role in the differences seen. Soil respiration was highest on limestone soil parent material type (3.3 g C-CO2 m-2 day-1), and soil temperature was lowest under closed canopy treatments (15°C)
A New Species of Andesipolis Whitfield & Choi from the Eastern Andes of Ecuador with Notes on Biology and Classification (Hymenoptera: Braconidae: Rhysipolinae)
A new species of braconid wasp, Andesipolis yanayacu, is described from the eastern Andes of Ecuador. Andesipolis yanayacu was reared as a gregarious koinobiont parasitoid of shelter building Pyralidae (Lepidoptera) larvae feeding on Urticaceae (Phenax rugosus and Boehmeria bullata). These are the first biological observations for the genus Andesipolis and the first species recorded from Ecuador. This is also the northern-most record for the genus as previously described species are from Chile. Based on morphological attributes and the newly discovered biology, Andesipolis is re-classified from the subfamily Mesostoinae into the subfamily Rhysipolinae
Nine New Species of Aleiodes Wesmael Reared at Yanayacu Biological Station (Hymenoptera: Braconidae: Rogadinae) in Eastern Ecuador
Nine new species of Aleiodes (Braconidae: Rogadinae) are described and illustrated: A. aclydis, A. albiterminus, A. arbitrium, A. atripileatus, A. capillosus, A. greeneiyi, A. nebulosus, A. speciosus and A. stilpnos. Because of the difficulties in distinguishing Neotropical species that belong to the circumscriptus and gastritor species-groups, a larger species-group combining the two, termed the circumscriptus/gastritor species-group, is created. The new species described in this study belonged to the seriatus, albitibia, gressitti, and circumscnptus/gastritor species-groups, respectively. Aldodes capillosus represents the first Neotropical species belonging to the gressitti species-group. Of the 34 previously described Neotropical species in Aldodes, only 13 have known biologies. The Aleiodes species in this study were reared from the families Geometridae and Noctuidae, two of the most common host families of other Aleiodes species worldwide
A microfluidic “baby machine” for cell synchronization
Common techniques used to synchronize eukaryotic cells in the cell cycle often impose metabolic stress on the cells or physically select for size rather than age. To address these deficiencies, a minimally perturbing method known as the “baby machine” was developed previously. In the technique, suspension cells are attached to a membrane, and as the cells divide, the newborn cells are eluted to produce a synchronous population of cells in the G1 phase of the cell cycle. However, the existing “baby machine” is only suitable for cells which can be chemically attached to a surface. Here, we present a microfluidic “baby machine” in which cells are held onto a surface by pressure differences rather than chemical attachment. As a result, our method can in principle be used to synchronize a variety of cell types, including cells which may have weak or unknown surface attachment chemistries. We validate our microfluidic “baby machine” by using it to produce a synchronous population of newborn L1210 mouse lymphocytic leukemia cells in G1 phase.National Cancer Institute (U.S.). Physical Sciences-Oncology Center (U54CA143874)National Institute of General Medical Sciences (U.S.) (EUREKA R01GM085457
Can a stress management programme reduce stress and improve quality of life in people diagnosed with multiple sclerosis?
Background
Despite evidence of perceived stress as a risk factor for multiple sclerosis activity, the evidence for managing stress is limited.
Objective To evaluate a stress management programme on perceived stress and quality of life, over 6 months.
Methods
One hundred people with multiple sclerosis were randomly assigned to either a stress management programme of mindfulness, meditation and progressive muscle relaxation, or wait list. Perceived stress and quality of life were assessed at three intervals across 6 months. Salivary cortisol levels were assessed at two intervals: baseline and first follow-up.
Results
The stress management programme did not significantly reduce perceived stress, when comparing mean scores. Secondary analysis using median scores found a significant improvement for quality of life, favouring the intervention group.
Conclusion
Stress management had no significant effect on the primary outcome of perceived stress but did improve quality of life in a secondary analysis of median scores
Gender, migration and the ambiguous enterprise of professionalizing domestic service: the case of vocational training for the unemployed in France
Drawing on ethnographic data concerning migrant male domestic workers, this article examines the gendered dimensions of the process of racialization in Italy and France. First, it shows that specific racialized constructions of masculinity are mobilized by the employers as well as by training and recruitment agencies. These constructions of masculinity are related to different forms of organization of the sector in each country and to different ideologies about the integration of migrants. Second, the data presented reveal the strategies used by migrant male domestic workers to reaffirm their masculinity in a traditionally feminized sector. In doing so, this article intends to explore the connections between international migration and the gendering of occupations, with regard to the construction and management of masculinities in domestic service. Finally, by examining men’s experiences, this article aims to contribute to a more complex definition of the international division of care work
Association between intravenous chloride load during resuscitation and in-hospital mortality among patients with SIRS
PURPOSE: Recent data suggest that both elevated serum chloride levels and volume overload may be harmful during fluid resuscitation. The purpose of this study was to examine the relationship between the intravenous chloride load and in-hospital mortality among patients with systemic inflammatory response syndrome (SIRS), with and without adjustment for the crystalloid volume administered. METHODS: We conducted a retrospective analysis of 109,836 patients ≥18 years old that met criteria for SIRS and received fluid resuscitation with crystalloids. We examined the association between changes in serum chloride concentration, the administered chloride load and fluid volume, and the ‘volume-adjusted chloride load’ and in-hospital mortality. RESULTS: In general, increases in the serum chloride concentration were associated with increased mortality. Mortality was lowest (3.7 %) among patients with minimal increases in serum chloride concentration (0–10 mmol/L) and when the total administered chloride load was low (3.5 % among patients receiving 100–200 mmol; P < 0.05 versus patients receiving ≥500 mmol). After controlling for crystalloid fluid volume, mortality was lowest (2.6 %) when the volume-adjusted chloride load was 105–115 mmol/L. With adjustment for severity of illness, the odds of mortality increased (1.094, 95 % CI 1.062, 1.127) with increasing volume-adjusted chloride load (≥105 mmol/L). CONCLUSIONS: Among patients with SIRS, a fluid resuscitation strategy employing lower chloride loads was associated with lower in-hospital mortality. This association was independent of the total fluid volume administered and remained significant after adjustment for severity of illness, supporting the hypothesis that crystalloids with lower chloride content may be preferable for managing patients with SIRS. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s00134-014-3505-3) contains supplementary material, which is available to authorized users
Commentary: Essential Programs and Services Model
To further discussion about the Essential Programs and Services (EPS) model for funding public education in Maine, Maine Policy Review asked eight superintendents—representing districts across the state— to provide their views. We also asked each to discuss the needs of his district and whether additional state policy options were necessary to tackle the most pressing issues. The districts represented by these superintendents are a cross section of urban and rural high-receivers and low-receivers. Still, several commonalities emerge: the need for a state commitment that does not wax and wane with the business cycle; the urgency of professional development for new and experienced teachers; and, the importance of linking student outcomes with student assessment measures and student funding. In short, EPS is not seen as a solution to the state’s ongoing debate over public-education funding, but is recognized as a necessary first step
The alpine flora on inselberg summits in the Maloti–Drakensberg Park, KwaZulu-Natal, South Africa
Background: Inselberg summits adjacent to the Maloti–Drakensberg escarpment occupy an alpine zone within the Drakensberg Alpine Centre (DAC). Inselbergs, the escarpment and surrounding mountains such as Platberg experience a severe climate; inselberg summits are distinct by being protected from human disturbance.
Objectives: The aim of this article was to describe for the first time the flora of inselberg summits and to assess their potential contribution to conservation of DAC plant diversity.
Method: We investigated whether the flora of inselberg summits formed a representative subset of the DAC flora in terms of shared, especially endemic or near endemic, species and representation of families. All species were listed for six inselbergs between Giant’s Castle and Sentinel, located in the Royal Natal National Park (RNNP) during November 2005. Comparisons, using literature, were made with floras of the DAC, as well as Platberg, an inselberg approximately 60 km north from Sentinel in the RNNP.
Results: We recorded 200 species of pteridophytes and angiosperms on inselbergs, 114 DAC endemics or near endemics, one possible new species, and several range and altitudinal extensions. Asteraceae, Poaceae and Ericaceae comprised 42.1% of endemic and near endemic species, with Scrophulariaceae and Hyacinthaceae contributing 8.8%. Inselberg and DAC floras differed in respective rankings of Crassulaceae (8th vs. 15th), Polygalaceae, Apiaceae and Rosaceae (10th, 11th, 12th vs. 15th), Poaceae (2nd vs. 5th), Cyperaceae (3rd vs. 4th) and Scrophulariaceae (6th vs. 2nd). Growth forms on inselbergs were consistent with DAC flora. Inselbergs shared 40% of species with Platberg.
Conclusion: Inselbergs, which supported 7.9% of species occurring in the DAC flora, are well protected from human impact, lack alien plants, but, despite this, are highly vulnerable to climate change. Conservation importance of inselbergs will increase as escarpment vegetation becomes increasingly degraded as a consequence of intensifying land use
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