The biology of Canadian weeds. 114. Symphyotrichum pilosum (Willd.) Nesom (Aster pilosus Willd.)

2001 ◽  
Vol 81 (4) ◽  
pp. 851-865 ◽  
Author(s):  
Jerry G. Chmielewski ◽  
John C. Semple
Keyword(s):  
North American ◽  
Natural Populations ◽  
The United States ◽  
Biological Data ◽  
First Year ◽  
Minor Importance ◽  
Moderate Amount ◽  
Disturbed Areas ◽  
Arable Fields ◽  
Aster Pilosus

Symphyotrichum pilosum (Willd.) Nesom, the white heath aster, is a robust, native North American, polyploid, herbaceous perennial. Until recently the species was treated as part of Aster. Its placement in the segregate genus Symphyotrichum follows the revised generic combinations proposed for North American asters. Occurring throughout eastern North America from Nova Scotia and Maine in the northeast, southward to Georgia, west ward through southern Quebec and Ontario to Wisconsin, Iowa, Kansas, and Arkansas in disturbed areas such as fallow land, roadsides, dumps, quarries, arable fields, railroad beds, and embankments, the species is troublesome in the United States but a weed of minor importance in Canada. Two varieties, var. pilosum and var. pringlei are recognized. The former, the hairy variety, is weedier than the latter, the hairless variety. The species commonly occurs in fields following the first year of abandonment and may dominate in the second, or subsequent years. Control may be achieved through the application of selected herbicides. Also, even a moderate amount of grazing by herbivores such as small rodents and rabbits is sufficient to restrict growth in the species. Mildew is chronic and widespread in natural populations but typically neither kills the plants nor prevents seed production. This contribution summarizes the known biological data for the species. Key words: Symphyotrichum pilosum, Aster pilosus, white heath aster, weed biology, var. pilosum, var. pringlei

The Biology of the Surface Zone Zooplankton of a Boreo-Arctic Atlantic Ocean Area

1952 ◽  
Vol 9 (5) ◽  
pp. 223-264 ◽  
Author(s):  
William V. Kielhorn
Keyword(s):  
Late Summer ◽  
The United States ◽  
Biological Data ◽  
Coast Guard ◽  
Calanus Finmarchicus ◽  
Labrador Sea ◽  
Physical Factors ◽  
Minor Importance ◽  
Surface Zone ◽  
Secchi Disc

Zooplankton samples were taken from the surface zone waters of the central Labrador Sea at International Ocean Station "B" (56° − 30′N., 51° − 00′W.) at weekly intervals throughout one calendar year for the purpose of determining the composition of the zooplankton, the seasonal progression, fluctuations and pertinent physical factors. An attempt was made to correlate the physical and biological factors.Ships of the United States Coast Guard and the Royal Canadian Navy were used as collecting units, and these were provided with nets, samplers and other equipment with which to carry out the shipboard phase of the investigation. Mid-day, 20 minute oblique hauls from 150-0 metres were made with the Clarke-Bumpus plankton sampler using No. 2 and No. 12 mesh silk nets, along with bathythermograph and Secchi disc lowerings. Later in the day, but at least one hour after dark, an open half-metre net 20 minute surface tow was made for additional qualitative data. Bioluminescence records also were obtained at this time.All available physical and biological data pertaining to the area under investigation were examined to provide a basis for comparison.Synopses of the species found in the material are presented individually, including their seasonal occurrence, probable breeding seasons, numerical and economic importance, and values as indicator forms. In all, 61 species in seven phyla, 10 classes and 17 orders are represented.The zooplankton population of the surface zone in the central Labrador Sea is characterized by relatively few species, but at the same time by large numbers of individuals. The plankton consists mainly of Calanus finmarchicus, Thysanoessa longicaudata, Oithona atlantica, Scolecithricella minor, Oikopleura labradoriensis and Eukrohnia hamata. The remainder of the species assume comparatively minor importance in the economy of the region.The main augmentation season was found to occur generally in late summer, although mid-winter breeding was noted for a few animals. The zooplankton of this region was found to be distinctive, being consistently oceanic, but neither true arctic nor true boreal. Definite biological evidence was obtained that indicated the influx of boreal-subtropical surface waters into the area in winter.Extinction coefficients determined from white Secchi disc readings are graphed, as are comparisons between black and white disc readings. It was concluded that the great variations of transparency were caused by fluctuations in the amount and kinds of phytoplankton and detritus in the water, and that the zooplankton density had little effect on water clarity.No direct correlation was noted between the occurrence of bioluminescence and individuin species or planktonic groups, but it was found that the greatest bioluminescence was observed al the summer and fall.

Benjamin Henry Latrobe and the nomenclature of two North American fishes

1987 ◽  
Vol 14 (1) ◽  
pp. 85-88
Author(s):  
CHARLOTTE M PORTER
Keyword(s):  
United States ◽  
North American ◽  
The United States ◽  
American Shad ◽  
New Name ◽  
The Common ◽  
Fish Louse

A curious error affects the names of three North American clupeids—the Alewife, American Shad, and Menhaden. The Alewife was first described by the British-born American architect, Benjamin Henry Latrobe in 1799, just two years after what is generally acknowledged as the earliest description of any ichthyological species published in the United States. Latrobe also described the ‘fish louse’, the common isopod parasite of the Alewife, with the new name, Oniscus praegustator. Expressing an enthusiasm for American independence typical of his generation, Latrobe humorously proposed the name Clupea tyrannus for the Alewife because the fish, like all tyrants, had parasites or hangers-on.

The Architecture of Our Discontent

2018 ◽  
Author(s):  
Yochai Benkler ◽  
Robert Faris ◽  
Hal Roberts
Keyword(s):  
Political Communication ◽  
News Media ◽  
The United States ◽  
Online Media ◽  
First Year ◽  
Media Ecosystem ◽  
The Media ◽  
The Right ◽  
Integrated Media ◽  
Presidential Election Campaign

This chapter presents the book’s macrolevel findings about the architecture of political communication and the news media ecosystem in the United States from 2015 to 2018. Two million stories published during the 2016 presidential election campaign are analyzed, along with another 1.9 million stories about Donald Trump’s presidency during his first year. The chapter examines patterns of interlinking between online media sources to understand the relations of authority and credibility among publishers, as well as the media sharing practices of Twitter and Facebook users to elucidate social media attention patterns. The data and mapping reveal not only a profoundly polarized media landscape but stark asymmetry: the right is more insular, skewed towards the extreme, and set apart from the more integrated media ecosystem of the center, center-left, and left.

scholarly journals Progress in Diagnosing Primary Ciliary Dyskinesia: The North American Perspective

Diagnostics ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1278
Author(s):  
Michael Glenn O’Connor ◽  
Amjad Horani ◽  
Adam J. Shapiro
Keyword(s):  
Genetic Testing ◽  
North America ◽  
North American ◽  
Primary Ciliary Dyskinesia ◽  
Clinical Phenotype ◽  
The United States ◽  
Diagnostic Process ◽  
The North ◽  
Diagnostic Guideline ◽  
Ciliary Dyskinesia

Primary Ciliary Dyskinesia (PCD) is a rare, under-recognized disease that affects respiratory ciliary function, resulting in chronic oto-sino-pulmonary disease. The PCD clinical phenotype overlaps with other common respiratory conditions and no single diagnostic test detects all forms of PCD. In 2018, PCD experts collaborated with the American Thoracic Society (ATS) to create a clinical diagnostic guideline for patients across North America, specifically considering the local resources and limitations for PCD diagnosis in the United States and Canada. Nasal nitric oxide (nNO) testing is recommended for first-line testing in patients ≥5 years old with a compatible clinical phenotype; however, all low nNO values require confirmation with genetic testing or ciliary electron micrograph (EM) analysis. Furthermore, these guidelines recognize that not all North American patients have access to nNO testing and isolated genetic testing is appropriate in cases with strong clinical PCD phenotypes. For unresolved diagnostic cases, referral to a PCD Foundation accredited center is recommended. The purpose of this narrative review is to provide insight on the North American PCD diagnostic process, to enhance the understanding of and adherence to current guidelines, and to promote collaboration with diagnostic pathways used outside of North America.

scholarly journals “The Future of Archaeology Is Antiracist”: Archaeology in the Time of Black Lives Matter

2021 ◽  
pp. 1-20
Author(s):  
Ayana Omilade Flewellen ◽  
Justin P. Dunnavant ◽  
Alicia Odewale ◽  
Alexandra Jones ◽  
Tsione Wolde-Michael ◽  
...  
Keyword(s):  
United States ◽  
North American ◽  
The United States ◽  
Heritage Preservation ◽  
Social Unrest ◽  
Black Lives Matter ◽  
The North ◽  
Road Map ◽  
The Social ◽  
The Future

This forum builds on the discussion stimulated during an online salon in which the authors participated on June 25, 2020, entitled “Archaeology in the Time of Black Lives Matter,” and which was cosponsored by the Society of Black Archaeologists (SBA), the North American Theoretical Archaeology Group (TAG), and the Columbia Center for Archaeology. The online salon reflected on the social unrest that gripped the United States in the spring of 2020, gauged the history and conditions leading up to it, and considered its rippling throughout the disciplines of archaeology and heritage preservation. Within the forum, the authors go beyond reporting the generative conversation that took place in June by presenting a road map for an antiracist archaeology in which antiblackness is dismantled.

Notice of transfer of figured specimens of North American Devonian cyclocystoids

1993 ◽  
Vol 67 (1) ◽  
pp. 151-151
Author(s):  
R. William Orr ◽  
Richard H. Fluegeman
Keyword(s):  
United States ◽  
New York ◽  
North American ◽  
The United States ◽  
State University ◽  
Ball State University ◽  
Geological Museum ◽  
University College ◽  
University Of Cincinnati ◽  
The University

In 1990 (Fluegeman and Orr) the writers published a short study on known North American cyclocystoids. This enigmatic group is best represented in the United States Devonian by only two specimens, both illustrated in the 1990 report. Previously, the Cortland, New York, specimen initially described by Heaslip (1969) was housed at State University College at Cortland, New York, and the Logansport, Indiana, specimen was housed at Ball State University, Muncie, Indiana. Both institutions recognize the importance of permanently placing these rare specimens in a proper paleontologic repository with other cyclocystoids. Therefore, these two specimens have been transferred to the curated paleontologic collection at the University of Cincinnati Geological Museum where they can be readily studied by future workers in association with a good assemblage of Ordovician specimens of the Cyclocystoidea.

Are Future Doctors Prepared to Address Patients’ Nutritional Needs? Cooking and Nutritional Knowledge and Habits in Medical Students

2021 ◽  
pp. 155982762110181
Author(s):  
Sam Sugimoto ◽  
Drew Recker ◽  
Elizabeth E. Halvorson ◽  
Joseph A. Skelton
Keyword(s):  
Medical Students ◽  
Prior Knowledge ◽  
The United States ◽  
First Year ◽  
Nutritional Knowledge ◽  
Cross Sectional Survey ◽  
Cross Sectional ◽  
Nutritional Needs ◽  
Second Year ◽  
First Year Medical Students

Background. Many diseases are linked to lifestyle in the United States, yet physicians receive little training in nutrition. Medical students’ prior knowledge of nutrition and cooking is unknown. Objective. To determine incoming medical students’ prior nutrition knowledge, culinary skills, and nutrition habits. Methods. A dual-methods study of first-year medical students. Cross-sectional survey assessing prior knowledge, self-efficacy, and previous education of cooking and nutrition. Interviews of second-year medical students explored cooking and nutrition in greater depth. Results. A total of 142 first-year medical students participated; 16% had taken a nutrition course, with majority (66%) learning outside classroom settings. Students had a mean score of 87% on the Nutritional Knowledge Questionnaire versus comparison group (64.9%). Mean cooking and food skills score were lower than comparison scores. Overall, students did not meet guidelines for fiber, fruit, vegetables, and whole grains. Interviews with second-year students revealed most learned to cook from their families; all believed it important for physicians to have this knowledge. Conclusions. Medical students were knowledgeable about nutrition, but typically self-taught. They were not as confident or skilled in cooking, and mostly learned from their family. They expressed interest in learning more about nutrition and cooking.

641 North American Practices for Facial Massage and Stretching Post Facial Burns

2021 ◽  
Vol 42 (Supplement_1) ◽  
pp. S176-S177
Author(s):  
Alexa Barwick ◽  
Dana Y Nakamura ◽  
James H Holmes ◽  
Joseph Molnar
Keyword(s):  
North American ◽  
Service Providers ◽  
Multiple Choice ◽  
Scar Tissue ◽  
The United States ◽  
Burn Care ◽  
Speech Language Pathologist ◽  
Specific Protocol ◽  
Facial Burns ◽  
Therapy Interventions

Abstract Introduction Facial burns can be complicated by the development of scar tissue and contractures, resulting in decreased flexibility of the tissue involved in swallowing, facial expression, and verbal communication. Maximizing functional range of motion is an important preventative measure for improving functional outcomes for swallowing, communication, and for the prevention of microstomia. A range of therapy interventions including stretching, massage, compression, and use of appliances has been reported in the literature; however, there is limited to no information on current practice patterns amongst North American providers (MD, DO, PA, NP, etc.) or therapists (PT, OT, and SLP). Methods A RedCap survey was developed by a Speech-Language Pathologist and Occupational Therapist involved in burn care. The survey consisted of 18 total questions, with participants responding to between 12–13 questions due to branching logic. Questions were related to demographic and service provision related to facial massage and stretching. Survey questions were multiple choice, multiple answer multiple choice, or contained text boxes. The survey was distributed to Providers and Therapists from the United Stated of America and Canada who were members of the American Burn Association (ABA). Results A total of 69 surveys were collected, with 57 surveys meeting criteria for inclusion. Respondents consisted of therapists 68%, providers 23%, and other health professionals 9%. Forty-six ABA burn centers from across the United States and Canada were represented. The majority of respondents had over 10 years of experience working with burn patients. 91% of respondents reported that facial massage and stretching was used as a tool at their facility. Respondents, who report facial massage is utilized at their facility, report OT as being the primary discipline responsible for assessing (67%) and completing (65%) facial massage, with 85% reporting additional discipline(s) also participating in facial massage. 9% of respondents report that facial massage and stretching is not utilized at their facility following facial burns. Of those who responded that facial massage and stretching is not utilized following facial burns, 40% felt this would be beneficial to patients, while 60% were unsure. Conclusions Facial scar management is an important part of burn care, with the majority of respondents reporting completion of facial massage and stretching as part of the services provided to patients who have suffered facial burns. OTs are the primary service providers for facial massage and stretching post facial burn. Practices for facial massage varies greatly, with the majority of respondents reporting no specific protocol for facial massage and stretching is followed.

Financial Returns in Major League Soccer

2021 ◽  
pp. 152700252110227
Author(s):  
John Charles Bradbury
Keyword(s):  
United States ◽  
Ownership Structure ◽  
North American ◽  
Consumer Demand ◽  
Professional Sports ◽  
The United States ◽  
Professional Soccer ◽  
Major League Soccer ◽  
Major League ◽  
Sports Leagues

Major League Soccer (MLS) is the top-tier professional soccer league serving the United States and Canada. This study examines factors hypothesized to impact consumer demand for professional sports on team revenue in this nascent league. The estimates are consistent with positive returns to performance, novelty effects from newer teams, and varying impacts from roster quality and composition. Other factors hypothesized to be important for MLS teams (e.g., stadium quality and market demographics) are not associated with team revenue. The estimates are similar to findings in other major North American sports leagues, even though MLS operates with a unique single-entity ownership structure that has the potential to disincentivize individual team investments by league owners.

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