10 research outputs found
Plant Macrofossils Associated with an Early Holocene Beaver Dam in Interior Alaska
Dynamic climate changes and expansion of new biomes characterize the late Pleistoceneâearly Holocene of eastern Beringia. Analysis of plant macrofossils from an early Holocene (ca. 9300 14C yrs BP) beaver dam in central Alaska provides insight into the local environment and vegetation. The plant macrofossil assemblage comprises remains of trees and shrubs, graminoids, and forbs, including Betula sp., Carex sp., Rubus sp., Eleocharis sp., Scirpus sp., Potamogeton sp., Najas flexilis and Typha latifolia, indicative of standing water of a beaver pond. Bryophytes from the beaver dam include Warnstorfia spp. and Drepanocladus aduncus, suggesting shallow, stagnant, or slow-moving water. The presence of Najas flexilis, Typha latifolia, and modern beaver (Castor canadensis) suggest that central Alaska had a warmer climate during the early Holocene.Changements climatiques dynamiques et expansion de nouveaux biomes caractĂ©risent la pĂ©riode du PlĂ©istocĂšne supĂ©rieur et de lâHolocĂšne infĂ©rieur de la BĂ©ringie de lâEst. Lâanalyse des macrofossiles de plantes provenant dâune digue de castor du centre de lâAlaska datant de lâHolocĂšne infĂ©rieur (env. 9300 14C annĂ©es BP) donne des indices sur lâenvironnement et la vĂ©gĂ©tation de la rĂ©gion. Lâassemblage de macrofossiles de plantes est composĂ© dâarbres et dâarbustes, de graminoĂŻdes et dâherbes non graminĂ©ennes, dont Betula sp., Carex sp., Rubus sp., Eleocharis sp., Scirpus sp., Potamogeton sp., Najas flexilis et Typha latifolia, ce qui signale la prĂ©sence dâeau stagnante dans un Ă©tang de castor. Parmi les bryophytes de la digue de castor, notons Warnstorfia spp. et Drepanocladus aduncus, ce qui laisse supposer la prĂ©sence dâeau peu profonde stagnante ou se dĂ©plaçant lentement. Par ailleurs, la prĂ©sence de Najas flexilis, Typha latifolia et du castor contemporain (Castor canadensis) laissent croire que le climat du centre de lâAlaska Ă©tait plus chaud pendant lâHolocĂšne infĂ©rieur
Vascular plant, bryophyte, and lichen biodiversity of Agguttinni Territorial Park, Baffin Island, Nunavut, Canada: an annotated species checklist of a new Arctic protected area
Agguttinni Territorial Park is a large, newly established park on the east-central coast of Baffin Island in Nunavut, Canada. Previous knowledge of the plant and lichen biodiversity was limited and based mostly on collections made during the 1950 Baffin Island Expedition. We conducted a floristic inventory of the park in 2021 and re-examined previous collections. We recorded 141 species of vascular plants belonging to 25 families, 69 species of bryophytes in 27 families, and 93 species of lichens in 23 families. Most of the vascular plant and bryophyte species are new records for the park area, and some vascular plants, bryophytes, and lichens are newly reported for Baffin Island, Nunavut, or the Canadian Arctic or represent significant range extensions. Vascular plant species diversity varied greatly among localities, with inland valleys at the heads of fiords showing highest diversity and interior rocky barrens showing the lowest
Vascular plant, bryophyte, and lichen biodiversity of Agguttinni Territorial Park, Baffin Island, Nunavut, Canada: an annotated species checklist of a new Arctic protected area
Agguttinni Territorial Park is a large, newly established park on the east-central coast of Baffin Island in Nunavut, Canada. Previous knowledge of the plant and lichen biodiversity was limited and based mostly on collections made during the 1950 Baffin Island Expedition. We conducted a ïŹoristic inventory of the park in 2021 and re-examined previous collections. We recorded 141 species of vascular plants belonging to 25 families, 69 species of bryophytes in 27 families, and 93 species of lichens in 23 families. Most of the vascular plant and bryophyte species are new records for the park area, and some vascular plants, bryophytes, and lichens are newly reported for Baffin Island, Nunavut, or the Canadian Arctic or represent signiïŹcant range extensions. Vascular plant species diversity varied greatly among localities, with inland valleys at the heads of ïŹords showing highest diversity and interior rocky barrens showing the lowest
Sopra alcuni casi dâinduzione elettro-dinamica
CITATION: Cluver, L. et al. 2020. Parenting in a time of COVID-19. Lancet, 395:e64, doi:10.1016/S0140-6736(20)30736-4.The original publication is available at https://www.thelancet.comCoronavirus disease 2019 (COVID-19) is changing family life. The United Nations Educational, Scientific and
Cultural Organization estimates 1·38 billion children are out of school or child care, without access to group
activities, team sports, or playgrounds.
Parents and caregivers are attempting
to work remotely or unable to work,
while caring for children, with no
clarity on how long the situation will
last. For many people, just keeping
children busy and safe at home is a
daunting prospect. For those living in
low-income and crowded households,
these challenges are exacerbated.Publisher's versio
Parenting in a time of COVID-19
CITATION: Cluver, L. et al. 2020. Parenting in a time of COVID-19. Lancet, 395:e64, doi:10.1016/S0140-6736(20)30736-4.The original publication is available at https://www.thelancet.comCoronavirus disease 2019 (COVID-19) is changing family life. The United Nations Educational, Scientific and
Cultural Organization estimates 1·38 billion children are out of school or child care, without access to group
activities, team sports, or playgrounds.
Parents and caregivers are attempting
to work remotely or unable to work,
while caring for children, with no
clarity on how long the situation will
last. For many people, just keeping
children busy and safe at home is a
daunting prospect. For those living in
low-income and crowded households,
these challenges are exacerbated.Publisher's versio
Sex Differences in Diagnosis and Diagnostic Revision of Suspected Minor Cerebral Ischemic Events
To describe sex differences in the presentation, diagnosis, and revision of diagnosis after early brain MRI in patients who present with acute transient or minor neurologic events.
We performed a secondary analysis of a prospective multicenter cohort study of patients referred to neurology between 2010 and 2016 with a possible cerebrovascular event and evaluated with brain MRI within 8 days of symptom onset. Investigators documented the characteristics of the event, initial diagnosis, and final diagnosis. We used multivariable logistic regression analyses to evaluate the association between sex and outcomes.
Among 1,028 patients (51% women, median age 63 years), more women than men reported headaches and fewer reported chest pain, but there were no sex differences in other accompanying symptoms. Women were more likely than men to be initially diagnosed with stroke mimic (54% of women vs 42% of men, adjusted odds ratio (OR) 1.60, 95% confidence interval [CI] 1.24-2.07), and women were overall less likely to have ischemia on MRI (10% vs 17%, OR 0.52, 95% CI 0.36-0.76). Among 496 patients initially diagnosed with mimic, women were less likely than men to have their diagnosis revised to minor stroke or TIA (13% vs 20%, OR 0.53, 95% CI 0.32-0.88) but were equally likely to have acute ischemia on MRI (5% vs 8%, OR 0.56, 95% CI 0.26-1.21).
Stroke mimic was more frequently diagnosed in women than men, but diagnostic revisions were common in both. Early brain MRI is a useful addition to clinical evaluation in diagnosing transient or minor neurologic events