12 results on '"Hartfield K"'
Search Results
2. Assessing Transmission of Crop Diseases by Insect Vectors in a Landscape Context
- Author
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Carrière, Y., primary, Degain, B., additional, Hartfield, K. A., additional, Nolte, K. D., additional, Marsh, S. E., additional, Ellers-Kirk, C., additional, Van Leeuwen, W.J.D., additional, Liesner, L., additional, Dutilleul, P., additional, and Palumbo, J. C., additional
- Published
- 2014
- Full Text
- View/download PDF
3. Developing, implementing, and evaluating a condom promotion program targeting sexually active adolescents.
- Author
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Alstead M, Campsmith M, Halley CS, Hartfield K, Goldbaum G, and Wood RW
- Abstract
This article describes the development, implementation, and evaluation of the Condom Campaign, a 1995 HIV prevention program promoting condom use among sexually active adolescents in three King County, Washington, urban communities. This program employed three main strategies: (a) mobilizing all levels of the target communities to support and guide program development and implementation; (b) creating and implementing a mass media campaign targeting sexually active teenagers that promoted correct condom use and favorable attitudes toward condoms; and (c) recruiting public agencies, community organizations, and businesses to distribute condoms from bins and vending machines. We evaluated the program through a series of cross-sectional interviews conducted in the three communities chosen for their elevated levels of adolescent sexual risk behavior. Overall, 73% of target youth reported exposure to the Condom Campaign; exposure did not differ by age, gender, race, or level of sexual experience. Levels of sexual activity remained stable throughout the media campaign. [ABSTRACT FROM AUTHOR]
- Published
- 1999
4. Adverse childhood experiences contribute to race/ethnic differences in post-secondary academic performance among college students.
- Author
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Watt TT, Hartfield K, Kim S, and Ceballos N
- Abstract
Objective: This study explores how adverse childhood experiences (ACEs) relate to race/ethnicity and academic achievement among a sample of college students., Participants: Participants were students attending a large public university in the Southwest (n = 404). Methods: Online surveys captured ACE scores, demographics, and self-reported GPA., Results: Students of Color had higher ACE scores and lower GPAs than White students. Regression analyses also revealed that an ACE score of 4 or higher is associated with lower GPAs, but only for Students of Color (Black and Hispanic students), not for White students., Conclusions: There are race/ethnic differences in the incidence and impact of adverse childhood experiences on post-secondary academic achievement. Thus, it is important for colleges and universities to create a trauma-informed campus culture and holistic mental health support system, particularly for Students of Color, who may not have had access to high quality care before attending college.
- Published
- 2023
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5. Pair-bonding leads to convergence in approach behavior to conspecific vocalizations in California mice (Peromyscus californicus).
- Author
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Rieger NS, Monari PK, Hartfield K, Schefelker J, and Marler CA
- Subjects
- Animals, Female, Male, Behavior, Animal physiology, Aggression physiology, Social Behavior, Peromyscus physiology, Vocalization, Animal physiology, Pair Bond
- Abstract
Pair-bonding allows for division of labor across behavioral tasks such as protecting a territory, caring for pups or foraging for food. However, how these labor divisions are determined, whether they are simply intrinsic differences in the individual's behavior or a coordinated behavioral response by the pair, remains unknown. We used the monogamous, biparental and territorial California mouse (Peromyscus californicus) to study how behavioral approach to an aggressive vocal stimulus in a novel environment was affected by pair-bonding. Using a three-chambered vocal playback paradigm, we first measured the amount of time individuals spent in close proximity to aggressive bark vocalizations. We found that animals could be categorized as either approachers or avoiders. We then paired individuals based on their initial approach behavior to an opposite sex individual who displayed either similar or different approach behaviors. These pairs were then retested for approach behavior as a dyad 10-11 days post-pairing. This test found that pairs showed convergence in their behavioral responses, such that pairs who were mismatched in their approach behaviors became more similar, and pairs that were matched remained so. Finally, we analyzed the ultrasonic vocalizations (USV) produced and found that pairs produced significantly more USVs than individuals. Importantly, increased USV production correlated with increasing behavioral convergence of pairs. Taken together, this study shows that pair-bonded animals alter their approach behaviors to coordinate their response with their partner and that vocal communication may play a role in coordinating these behavioral responses. Overall, our findings indicate that pair-bonding generates an emergent property in pairs, adjusting their combined approach behavior towards a new aggressive stimulus representing a potential challenge to the bonded pair. Such findings may be broadly important for social bonding in other social systems., Competing Interests: The authors have declared no competing interests exist.
- Published
- 2021
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- View/download PDF
6. Inhibition of CMP-sialic acid transport by endogenous 5-methyl CMP.
- Author
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Ahuja S, Cahill J, Hartfield K, and Whorton MR
- Subjects
- Animals, Cell Line, Cytidine Monophosphate metabolism, Epigenesis, Genetic genetics, Glycosylation, Methylation, Nucleotide Transport Proteins metabolism, RNA Processing, Post-Transcriptional genetics, Sf9 Cells, Spodoptera, Biological Transport physiology, Cytidine Monophosphate analogs & derivatives, Cytidine Monophosphate N-Acetylneuraminic Acid metabolism, Gene Expression Regulation physiology
- Abstract
Nucleotide-sugar transporters (NSTs) transport nucleotide-sugar conjugates into the Golgi lumen where they are then used in the synthesis of glycans. We previously reported crystal structures of a mammalian NST, the CMP-sialic acid transporter (CST) (Ahuja and Whorton 2019). These structures elucidated many aspects of substrate recognition, selectivity, and transport; however, one fundamental unaddressed question is how the transport activity of NSTs might be physiologically regulated as a means to produce the vast diversity of observed glycan structures. Here, we describe the discovery that an endogenous methylated form of cytidine monophosphate (m5CMP) binds and inhibits CST. The presence of m5CMP in cells results from the degradation of RNA that has had its cytosine bases post-transcriptionally methylated through epigenetic processes. Therefore, this work not only demonstrates that m5CMP represents a novel physiological regulator of CST, but it also establishes a link between epigenetic control of gene expression and regulation of glycosylation., Competing Interests: The authors have declared that no competing interests exist.
- Published
- 2021
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- View/download PDF
7. Correction: Spatial, Temporal, and Density-Dependent Components of Habitat Quality for a Desert Owl.
- Author
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Flesch AD, Hutto RL, van Leeuwen WJ, Hartfield K, and Jacobs S
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- 2015
- Full Text
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8. Spatial, temporal, and density-dependent components of habitat quality for a desert owl.
- Author
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Flesch AD, Hutto RL, van Leeuwen WJ, Hartfield K, and Jacobs S
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- Animals, Longitudinal Studies, Mexico, Population Density, Population Dynamics, Reproduction physiology, Conservation of Natural Resources methods, Desert Climate, Ecosystem, Strigiformes physiology, Weather
- Abstract
Spatial variation in resources is a fundamental driver of habitat quality but the realized value of resources at any point in space may depend on the effects of conspecifics and stochastic factors, such as weather, which vary through time. We evaluated the relative and combined effects of habitat resources, weather, and conspecifics on habitat quality for ferruginous pygmy-owls (Glaucidium brasilianum) in the Sonoran Desert of northwest Mexico by monitoring reproductive output and conspecific abundance over 10 years in and around 107 territory patches. Variation in reproductive output was much greater across space than time, and although habitat resources explained a much greater proportion of that variation (0.70) than weather (0.17) or conspecifics (0.13), evidence for interactions among each of these components of the environment was strong. Relative to habitat that was persistently low in quality, high-quality habitat buffered the negative effects of conspecifics and amplified the benefits of favorable weather, but did not buffer the disadvantages of harsh weather. Moreover, the positive effects of favorable weather at low conspecific densities were offset by intraspecific competition at high densities. Although realized habitat quality declined with increasing conspecific density suggesting interference mechanisms associated with an Ideal Free Distribution, broad spatial heterogeneity in habitat quality persisted. Factors linked to food resources had positive effects on reproductive output but only where nest cavities were sufficiently abundant to mitigate the negative effects of heterospecific enemies. Annual precipitation and brooding-season temperature had strong multiplicative effects on reproductive output, which declined at increasing rates as drought and temperature increased, reflecting conditions predicted to become more frequent with climate change. Because the collective environment influences habitat quality in complex ways, integrated approaches that consider habitat resources, stochastic factors, and conspecifics are necessary to accurately assess habitat quality.
- Published
- 2015
- Full Text
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9. The University of Washington's Community-Oriented Public Health Practice program and Public Health-Seattle & King County partnership.
- Author
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House PJ, Hartfield K, Nicola B, and Bogan SL
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- Education, Public Health Professional methods, Humans, Interinstitutional Relations, Local Government, Washington, Education, Public Health Professional organization & administration, Public Health Practice, Universities organization & administration
- Abstract
The Community-Oriented Public Health Practice (COPHP) program, a 2-year in-residence MPH degree program in the University of Washington School of Public Health, has partnered with Public Health-Seattle & King County (PHSKC) since 2002 to create a mutually beneficial set of programs to improve teaching and address community-based public health problems in a practice setting. The COPHP program uses a problem-based learning approach that puts students in small groups to work on public health problems. Both University of Washington-based and PHSKC-based faculty facilitate the classroom work. In the first year for students, COPHP, in concert with PHSKC, places students in practicum assignments at PHSKC; in the second year, students undertake a master's project (capstone) in a community or public health agency. The capstone project entails taking on a problem in a community-based agency to improve either the health of a population or the capacity of the agency to improve population health. Both the practicum and the capstone projects emphasize applying classroom learning in actual public health practice work for community-based organizations. This partnership brings PHSKC and COPHP together in every aspect of teaching. In essence, PHSKC acts as the "academic health department" for COPHP. There are detailed agreements and contracts that guide all aspects of the partnership. Both the practicum and capstone projects require written contracts. The arrangements for getting non-University of Washington faculty paid for teaching and advising also include formal contracts.
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- 2014
- Full Text
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10. Variability in practices for investigation, prevention, and control of communicable diseases among Washington State's Local health jurisdictions.
- Author
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Thiede H, Duchin JS, Hartfield K, and Fleming DW
- Subjects
- Health Care Surveys, Humans, Washington, Communicable Disease Control standards, Local Government, Public Health Practice standards
- Abstract
Objective: To assess variability in investigation, prevention, and control of communicable diseases of public health significance among Washington State local health jurisdictions., Design: Online survey conducted from December 2010 to January 2011., Setting: Washington State local health jurisdictions., Participants: Local health officers in the 35 local health jurisdictions in Washington State., Main Outcome Measures: Variability across local health departments in public health case investigation practices, recommendations, and activities related to animal bites and potential rabies exposures, hepatitis C, meningitis, pertussis, foodborne illness complaints, tuberculosis, reportable animal diseases, provision of health education materials, and use of local disease investigation protocols in addition to statewide case reporting guidelines., Results: We found differences in approaches to investigation of several notifiable diseases. The most pronounced variations were in investigation of hepatitis C cases and recommendations for rabies postexposure prophylaxis. We also found variability in follow-up of low-risk contacts of pertussis cases, testing for latent tuberculosis infection, organization of response to foodborne illness complaints and avian chlamydiosis, and use of zoonotic disease prevention materials., Conclusions: Washington State residents receive different public health advice and services for communicable disease issues depending on where they reside in the state. Unnecessary variation is undesirable and may undermine public confidence in the public health system. Additional research is needed to better understand reasons for these differences and to determine whether there are policy, funding, or programmatic changes that could address areas in need of standardization.
- Published
- 2012
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11. Large-scale, spatially-explicit test of the refuge strategy for delaying insecticide resistance.
- Author
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Carrière Y, Ellers-Kirk C, Hartfield K, Larocque G, Degain B, Dutilleul P, Dennehy TJ, Marsh SE, Crowder DW, Li X, Ellsworth PC, Naranjo SE, Palumbo JC, Fournier A, Antilla L, and Tabashnik BE
- Subjects
- Animals, Arizona, Bacillus thuringiensis drug effects, Gossypium drug effects, Gossypium genetics, Gossypium parasitology, Hemiptera drug effects, Plants, Genetically Modified, Regression Analysis, Agriculture methods, Insecticide Resistance drug effects, Pyridines toxicity
- Abstract
The refuge strategy is used worldwide to delay the evolution of pest resistance to insecticides that are either sprayed or produced by transgenic Bacillus thuringiensis (Bt) crops. This strategy is based on the idea that refuges of host plants where pests are not exposed to an insecticide promote survival of susceptible pests. Despite widespread adoption of this approach, large-scale tests of the refuge strategy have been problematic. Here we tested the refuge strategy with 8 y of data on refuges and resistance to the insecticide pyriproxyfen in 84 populations of the sweetpotato whitefly (Bemisia tabaci) from cotton fields in central Arizona. We found that spatial variation in resistance to pyriproxyfen within each year was not affected by refuges of melons or alfalfa near cotton fields. However, resistance was negatively associated with the area of cotton refuges and positively associated with the area of cotton treated with pyriproxyfen. A statistical model based on the first 4 y of data, incorporating the spatial distribution of cotton treated and not treated with pyriproxyfen, adequately predicted the spatial variation in resistance observed in the last 4 y of the study, confirming that cotton refuges delayed resistance and treated cotton fields accelerated resistance. By providing a systematic assessment of the effectiveness of refuges and the scale of their effects, the spatially explicit approach applied here could be useful for testing and improving the refuge strategy in other crop-pest systems.
- Published
- 2012
- Full Text
- View/download PDF
12. Developing a cost-effective media campaign addressing unprotected anal sex among gay men.
- Author
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Dawson C and Hartfield K
- Subjects
- Cartoons as Topic, Cost-Benefit Analysis, Humans, Male, Program Evaluation, Washington, Condoms statistics & numerical data, HIV Infections prevention & control, Health Promotion methods, Homosexuality, Male, Mass Media economics
- Abstract
This paper describes the development and implementation of the Stella Seattle campaign, a media campaign targeting men who have unprotected anal sex with other men. Stella Seattle utilizes a serial cartoon strip format. Scenarios and characters in the strip are derived from local formative research on factors associated with unprotected anal sex in men who have sex with men, including depression, isolation, misinformation, and normative behavior. Weekly strips illustrating the struggles and hopes of gay men who are practicing unprotected anal sex are distributed in postcard form throughout the gay community and are placed in two weekly newspapers. Surveys conducted in the gay community and at an HIV test site indicate that 35% to 45% of men have seen Stella, and of these men about half have discussed it with their friends.
- Published
- 1996
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