Phenotypic Plasticity of Reproduction in Schizachyrium scoparium (Poaceae) Populations in Relation to Ecological History

Genetic differentiation in reproduction in the wide-ranging Schizachyrium scoparium (Poaceae) has been demonstrated in uniform gardens. However, the fine-tuning of flowering phenology and biomass allocation in relation to spatial and temporal fluctuations in the local environment is best accomplished by plastic responses to local variability. An earlier central New Jersey study suggested that S. scoparium populations in old fields of 2 to 40 years differed in plasticity. To test this apparent effect of ecological history on the development of different levels of plasticity, genotypes were collected from high- and low-fertility sites in New Jersey (forest biome) and in Oklahoma (grassland biome). Three greenhouse experiments manipulating light and nutrients were used to partition variation into genetic and environmental components. High light or high nutrients resulted in plasticity for increased biomass, greater reproductive allocation, and more tillers. Earlier flowering was induced by high light, but nutrient treatments had no effect. Populations were more likely to differ in plasticity across regions than within regions, and Oklahoma populations were consistently more plastic than New Jersey populations. In response to nutrients, populations from high-nutrient sites were often more plastic than those from low-nutrient sites. There were fewer differences in plasticity in response to light between high- and low-nutrient populations. The greater plasticity in Oklahoma populations is suggested to be the result of historically greater environmental unpredictability and K-selection factors such as density-dependent selection and greater competition for resources. A native grass population is more than just a Latin binomial. Evolutionary forces create an ecological unit unique and irreplaceable at the local level

Are hygiene standards useful in assessing infection risk?

We monitored the surface level cleanliness of a five-bedded surgical intensive care unit (SICU) over a ten-week period in order to evaluate proposed hygiene standards.Ten environmental sites within SICU were sampled twice weekly along with collection of clinical and patient activity data. The standards designate aerobic colony counts (ACCs) >2.5cfu/cm2 from hand-touch sites and the presence of Staphylococcus aureus as hygiene failures. Nearly a quarter of 200 samples failed the standards, mostly from hand-touch sites on curtains, beds and medical equipment. The total number of fails each week was associated with bed occupancy (p=0.04), trending towards association with SICU-acquired infections (p=0.11). Environmental S.aureus was associated with the proportion of beds occupied (p = 0.02). Indistinguishable genotypes were found between patient and environmental staphylococci, with timescales supporting staphylococcal transmission in both directions. Hygiene standards based on microbial growth levels and the presence of S.aureus reflect patient activity and provide a means to risk manage infection. They also exposed a staphylococcal reservoir that could represent a more tangible risk to patients. Standards for surface level cleanliness deserve further evaluation

Klipsun Magazine, 1981, Volume 12, Issue 01 - November

https://cedar.wwu.edu/klipsun_magazine/1060/thumbnail.jp

Can The Mercenary from James Bond Shoot Through A Train Coupling?

This paper discusses the possibility of the mercenary from Skyfall, Patrice, being able to shoot through the link between two train carriages to attempt to get away from the secret agent, James Bond. During an altercation atop a train in Istanbul, Patrice shoots through the coupling with ease, separating the two carriages. This paper shows that the required force to shoot through a steel alloy coupling would be 148285N, as the bullet would only exert around a third of the force required, 52099.2N, and this paper proves that this cannot be done with such ease as portrayed in the film

Can Nyan Cat Escape The Moon?

This paper discusses the possibility of Nyan Cat’s capabilities to escape the moon. The dimensions and nutritional values, provided by the Kellogg’s Company, of a Pop-Tart were used, and applied to the model of an average adult cat. It was concluded that Nyan Cat would not be able to escape from the moon. However, if the rainbow that he excretes has some magical powers that would provide him the extra 8.42x10^6J needed to escape the moon

Klipsun Magazine, 1982, Volume 12, Issue 02 - January

https://cedar.wwu.edu/klipsun_magazine/1061/thumbnail.jp

Would the Demolition Man become the Demolished Man?

In the 1993 film Demolition Man, starring Sylvester Stallone, the main character falls from a helicopter suspended by a wire of steel. The fall would generate a G-force of 14.03G and since the wire is attached to his waist it would most likely be terminal but a further, more in depth look into the problem is required

A dialogue of two selves : themes of alienation and African humanism in the works of Es'kia Mphahlele

Es'kia Mphahlele's concept of African humanism was a seminal influence on Black Consciouness thought and provided the philosophical basis for a landmark body of South African criticism and aesthetics wilh roots in Africa. African humanism as a black ethos, combined with rich metaphoric speech, symbols, values and myths resurrected from the deep African past, afforded the author a powerful cultural weapon with which to criticize centuries of colonialism, racism, and state apartheid, related western industrial forces of economic exploitation and alienation. Moreover, the counterweights of African humanism and alienation in the dialogue of two selves -- one that is Western-educated and colonized and the other African -- contribute key elements of realism, vitality, humour, insight, cultural identity, and characterization to Mphahlele's most effective protest writing which, in turn, has helped to shape a black nationalist vision which has surprising relevance to South Africa in the 1990s.M.A. (English)English Studie

Measuring the effect of enhanced cleaning in a UK hospital : a prospective cross-over study

Increasing hospital-acquired infections have generated much attention over the last decade. There is evidence that hygienic cleaning has a role in the control of hospital-acquired infections. This study aimed to evaluate the potential impact of one additional cleaner by using microbiological standards based on aerobic colony counts and the presence of Staphylococcus aureus including meticillin-resistant S. aureus. We introduced an additional cleaner into two matched wards from Monday to Friday, with each ward receiving enhanced cleaning for six months in a cross-over design. Ten hand-touch sites on both wards were screened weekly using standardised methods and patients were monitored for meticillin-resistant S. aureus infection throughout the year-long study. Patient and environmental meticillin-resistant S. aureus isolates were characterised using molecular methods in order to investigate temporal and clonal relationships. Enhanced cleaning was associated with a 32.5% reduction in levels of microbial contamination at handtouch sites when wards received enhanced cleaning (P < 0.0001: 95% CI 20.2%, 42.9%). Near-patient sites (lockers, overbed tables and beds) were more frequently contaminated with meticillin-resistant S. aureus/S. aureus than sites further from the patient (P = 0.065). Genotyping identified indistinguishable strains from both handtouch sites and patients. There was a 26.6% reduction in new meticillin-resistant S. aureus infections on the wards receiving extra cleaning, despite higher meticillin-resistant S. aureus patient-days and bed occupancy rates during enhanced cleaning periods (P = 0.032: 95% CI 7.7%, 92.3%). Adjusting for meticillin-resistant S. aureus patient-days and based upon nine new meticillin-resistant S. aureus infections seen during routine cleaning, we expected 13 new infections during enhanced cleaning periods rather than the four that actually occurred. Clusters of new meticillin-resistant S. aureus infections were identified 2 to 4 weeks after the cleaner left both wards. Enhanced cleaning saved the hospital £30,000 to £70,000.Introducing one extra cleaner produced a measurable effect on the clinical environment, with apparent benefit to patients regarding meticillin-resistant S. aureus infection. Molecular epidemiological methods supported the possibility that patients acquired meticillin-resistant S. aureus from environmental sources. These findings suggest that additional research is warranted to further clarify the environmental, clinical and economic impact of enhanced hygienic cleaning as a component in the control of hospital-acquired infection