In Tennessee, populations of the state endangered Streamside Salamander (Ambystoma barbouri) are in decline as their distribution lies mostly within rapidly developing areas in the Nashville Basin. ...Information regarding the partitioning of genetic variation among populations of A. barbouri and the taxonomic status of these populations relative to northern populations and their congener, the Small-mouthed Salamander (A. texanum), have important implications for management and conservation of this species. Here we combined mitochondrial sequencing and genome-wide single nucleotide polymorphism (SNP) data generated using Genotyping-by-Sequencing (GBS) to investigate patterns of genetic variation within Tennessee populations of A. barbouri, to assess their relationship to populations in Kentucky, and to examine their phylogenetic relationship to the closely related A. texanum. Results from phylogenetic reconstructions reveal a complex history of Tennessee A. barbouri populations with regards to northern populations, unisexual A. barbouri, and A. texanum. Patterns of mitochondrial sequence variation suggest that A. barbouri may have originated within Tennessee and expanded north multiple times into Kentucky, Ohio, Indiana, and West Virginia. Phylogenetic reconstructions based on genome-wide SNP data contradict results based on mitochondrial DNA and correspond to geographic and taxonomic boundaries. Variation in allele frequencies at SNP genotypes, as identified by multivariate analyses and Bayesian assignment tests, identified three evolutionary significant units (ESUs) for A. barbouri within Tennessee. Collectively, these results emphasize the need for prioritizing conservation needs for Tennessee populations of A. barbouri to ensure the long-term persistence of this species.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
2.
The Stuff of Dreams Hurt, R. Douglas
Agricultural history,
10/2020, Letnik:
94, Številka:
4
Journal Article
Advocates of public power, however, believed that governmental generation of electricity would meet the needs of farmers and urbanites rather than emphasize profits as did the private utility ...companies. Before the jolt of the Tennessee Valley Authority in 1933, private companies provided electric power from coal-fired generating plants for relatively few urban customers. ...private power companies won the battle for the generation and dissemination of electric power, and they met the public demand for affordable electricity.
An insulated concrete wall system
1
1
T-Mass™ by the Dow Chemical Company.
was used on exterior walls of a zero energy house. Its thermal functions were investigated using actual data in comparison ...to a conventional wood frame system. The internal wall temperature of massive systems changes more slowly than the conventional wall constructions, leading to a more stable indoor temperature. The Energy10 simulated equivalent
R-value and DBMS of the mass walls under actual climate conditions are, respectively, 6.98 (m
2
°C)/W and 3.39. However, the simulated heating energy use was much lower for the massive walls while the cooling load was a little higher. Further investigation on the heat flux indicates that the heat actually is transferred inside all day and night, which results in a higher cooling energy consumption. A one-dimensional model further verified these analyses, and the calculated results are in good agreement with the actual data. We conclude that the thermal mass wall does have the ability to store heat during the daytime and release it back at night, but in desert climates with high 24-h ambient temperature and intense sunlight, more heat will be stored than can be transferred back outside at night. As a result, an increased cooling energy will be required.
This book provides a unique, thorough, and indispensable resource for anyone investigating the causes and consequences of the Dust Bowl. During the 1930s, drought and the cultivation of submarginal ...lands created a severe wind-erosion problem in the southern Great Plains, a region that became known as the Dust Bowl. During the worst dust storms, the blowing soil often turned day into night. Some people died when caught outside during a black blizzard, others developed "dust pneumonia," and some residents moved to California. Most people, however, remained. Those who stayed and endured the storms had an abiding faith that federal resources and the return of normal rainfall would end the dust storms and return life to normal, free from the desperation and fear caused by the blowing soil. Documents of the Dust Bowl offers a fascinating documentary history of one of the worst ecological disasters in American history. It will enable high school students and academics alike to study the manner in which Dust Bowl residents confronted and endured the dust storms in the southern Great Plains during the 1930s.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
7.
The Two Micron All Sky Survey (2MASS) Skrutskie, M. F; Cutri, R. M; Stiening, R ...
The Astronomical journal,
02/2006, Letnik:
131, Številka:
2
Journal Article
Recenzirano
Odprti dostop
Between 1997 June and 2001 February the Two Micron All Sky Survey (2MASS) collected 25.4 Tbytes of raw imaging data covering 99.998% of the celestial sphere in the near-infrared J (1.25 mm), H (1.65 ...mm), and Ks (2.16 mm) bandpasses. Observations were conducted from two dedicated 1.3 m diameter telescopes located at Mount Hopkins, Arizona, and Cerro Tololo, Chile. The 7.8 s of integration time accumulated for each point on the sky and strict quality control yielded a 10 s point-source detection level of better than 15.8, 15.1, and 14.3 mag at the J, H, and Ks bands, respectively, for virtually the entire sky. Bright source extractions have 1 s photometric uncertainty of <0.03 mag and astrometric accuracy of order 100 mas. Calibration offsets between any two points in the sky are <0.02 mag. The 2MASS All-Sky Data Release includes 4.1 million compressed FITS images covering the entire sky, 471 million source extractions in a Point Source Catalog, and 1.6 million objects identified as extended in an Extended Source Catalog.
With the Cotonou Agreement due to expire in 2020, formal negotiations towards a new partnership agreement between the EU and African, Caribbean and Pacific (ACP) states began in September 2018. Based ...on the acceptance of the EU’s negotiating mandate, the new arrangement will be primarily organised via three specific regional protocols with each of the ACP regions. Meanwhile, the Joint Africa-EU Strategy (JAES) launched in 2007, has seen the African Union (AU) gain increased prominence as an institutional partner of the EU. Given its ambitious pan-African agenda, it adopted an alternative ‘African’ vision for future EU-ACP relations, to the mandate agreed by the ACP states and expressed a willingness to become directly involved in the negotiations. This article contributes an important new case-study to the existing literature on ‘African agency’ in international politics by considering the scope for Africa to exert agency within the post-Cotonou negotiations, given the negotiation of a specific regional compact with Africa. It adopts a structurally embedded view of agency, based on Cox’s understanding of historical structures, as a fit between institutions, ideas and material relations. The central argument is that, in comparison to the negotiation of the Cotonou Agreement two decades ago, there is greater scope for African agency. However, both the ideational and material aspects of Africa’s relationship with the EU, condition the limits to how effective such agency might be. Moreover, tensions at the institutional level between the ACP and AU further undermine the potential for effective African agency.
Neuroimaging has provided compelling data about the brain. Yet the underlying mechanisms of many neuroimaging techniques have not been elucidated. Here we report a voxel-based morphometry (VBM) study ...of Thy1-YFP mice following auditory fear conditioning complemented by confocal microscopy analysis of cortical thickness, neuronal morphometric features and nuclei size/density. Significant VBM results included the nuclei of the amygdala, the insula and the auditory cortex. There were no significant VBM changes in a control brain area. Focusing on the auditory cortex, confocal analysis showed that fear conditioning led to a significantly increased density of shorter and wider dendritic spines, while there were no spine differences in the control area. Of all the morphology metrics studied, the spine density was the only one to show significant correlation with the VBM signal. These data demonstrate that learning-induced structural changes detected by VBM may be partially explained by increases in dendritic spine density.
Purpose of Review
To provide an overview of current methods of diagnosis and management of refeeding syndrome in the critically ill patient population.
Recent Findings
Despite recent publications ...indicating refeeding syndrome (RFS) is an ongoing problem in critically ill patients, there is no standard for the diagnosis and management of this life-threatening condition. There is not a “gold standard” nutrition assessment tool for the critically ill. Currently, the National Institute for Health and Clinical Excellence criteria represent the best clinical assessment tool for RFS
.
Diagnosis and management with the help of a multidisciplinary metabolic team can decrease morbidity and mortality.
Summary
Although a universal definition of RFS has yet to be defined, the diagnosis is made in patients with moderate to severe malnutrition who develop electrolyte imbalance after beginning nutritional support. The imbalances potentially can lead to cardiac, pulmonary, and gastrointestinal complications and failure. Standardizing a multidisciplinary nutrition care plan and formulating a protocol for critically ill patients who develop RFS can potentially decrease complication rates and overall mortality.
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