1,084 research outputs found
Bees visiting the broad bean (Vicia faba L.) and the impact of border planting on their abundance and the yield improvement in Ismailia, Egypt:
Incorporating flowering plants into cropping systems has the potential to actively enhance pollination and crops yields. This study evaluated whether the introduction of border planting affects bee visitation and yield of a broad bean (Vicia faba L.). Experiments were carried out in 2018 and 2019 in Ismailia, Egypt. Bee visitation and broad bean yields were compared between plots with and without border planting. Results showed that open flowers achieved higher yields than netted flowers. Apis mellifera L. was the dominant visitor, followed by four solitary bee species, Chalicodoma siculum (Rossi), Colletes lacunatus Dours, 1872, Andrena ovatula and Xylocopa pubescens (Kirby, 1802). The addition of border planting was associated with a significant increase in the abundance of all five bee visitors and the associated yields. Findings showed that flowering border plants adjacent to broad bean can actively enhance pollination services and yields of this commercially valuable crop, whilst helping to conserve vulnerable bee populations
Assessing the Ability of Student Pharmacists to Facilitate Human Immunodeficiency Virus Point-of-Care Testing
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On the discovery of K-enhanced and possibly Mg-depleted stars throughout the Milky Way
Stars with unusual elemental abundances offer clues about rare astrophysical
events or nucleosynthetic pathways. Stars with significantly depleted magnesium
and enhanced potassium ([Mg/Fe] 1) have to date only been
found in the massive globular cluster NGC 2419 and, to a lesser extent, NGC
2808. The origin of this abundance signature remains unknown, as does the
reason for its apparent exclusivity to these two globular clusters. Here we
present 112 field stars, identified from 454,180 LAMOST giants, that show
significantly enhanced [K/Fe] and possibly depleted [Mg/Fe] abundance ratios.
Our sample spans a wide range of metallicities (-1.5 < [Fe/H] < 0.3), yet none
show abundance ratios of [K/Fe] or [Mg/Fe] that are as extreme as those
observed in NGC 2419. If confirmed, the identified sample of stars represents
evidence that the nucleosynthetic process producing the anomalous abundances
ratios of [K/Fe] and [Mg/Fe] probably occurs at a wide range of metallicities.
This would suggest that pollution scenarios that are limited to early epochs
(such as Population III supernovae) are an unlikely explanation, although they
cannot be ruled out entirely. This sample is expected to help guide modelling
attempts to explain the origin of the Mg-K abundance signature
‘Scots and Scabs from North-by-Tweed’:Undesirable Scottish Migrants in Seventeenth- and Early Eighteenth-Century England
While very prominent in the contemporary world, anxiety about the potentially negative impact that immigrants might have on their host communities has deep historical roots. In a British context, such fears were particularly heightened following the regal union of 1603 when large numbers of Scots began settling in England. This article offers a fresh perspective on these issues by exploring the experiences and reception of poor, deviant or otherwise ‘undesirable’ Scottish migrants to England during the seventeenth and eighteenth centuries. Focusing in particular on chapmen, vagrants and criminals, it suggests that, while in general Scots were able to integrate relatively easily into English society, there existed an unwelcome subset surviving by dubious means. Though not usually attracting unduly severe treatment on account of their nationality, these unwelcome migrants had a disproportionate effect on English perceptions of and attitudes towards the broader cohort of Scottish migrants in their midst
Kinematic and thermal signatures of the directly imaged protoplanet candidate around Elias 2-24
We report kinematic and thermal signatures associated with the directly
imaged protoplanet candidate in the Elias 2-24 disc. Using the DSHARP ALMA
observations of the CO J=2-1 line, we show that the disc kinematics are
perturbed, with a detached CO emission spot at the location of the planet
candidate and traces of spiral wakes, and also that the observed CO emission
intensities require local heating. While the foreground extinction hides the
velocity channels associated with the planet, preventing a planet mass
estimate, the level of gas heating implied by the CO emission indicates the
presence of a warm, embedded giant planet. Comparison with models show this
could either be a M, or a lower mass ( M) but accreting proto-planet.Comment: 6 pages, 3 figures, accepted for publication in MNRAS Letter
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