What makes a community invasible? For over a century ecologists have sought to understand the relative importance of biotic and abiotic factors that determine community composition. The fact that we are still exploring this topic today hints at both its importance and complexity. As the impacts from harmful non-native species accumulate, it has become increasingly urgent to find answers to the ...

This 1989-1991 study in California and Utah used daily urinary metabolites of estrogen and progesterone and computer algorithms to assess ovulatory status and day of ovulation. The authors examined the associations of risk factors with menstrual cycle characteristics for 309 working women aged 20-44 years who collected a median of five cycles each of daily urine samples. Linear mixed models wer...

UBBY and LEWONTIN (1966; LEWONTIN and HUBBY 1966) have demonstrated the probability that a population of diploid organisms can support more than an estimated 1000 polymorphisms. Their calculations agree with those of KIMURA and CROW (1964) and VAN VALEN (1963) in indicating that such widespread polymorphism cannot be maintained through single locus heterosis without entailing an absurdly high s...

Using data from the fifth wave of the World Values Survey (2005-2008), this study examined the relationship between affluence, post-materialist values, and pro-environmental attitudes from individuals from Morocco, Uruguay, Sweden, and the United States. Demographic variables were also analyzed to determine which factors were the best predictors of pro-environmental attitudes from each of the f...

Studies on Italian Double-entry Bookkeeping Thought (IDBT) evolution are seldom found in such aspects as accounts with persons (AP), accounts with goods (AG), and accounts equilibria (AE), etc., so we studied IDBT evolution in the aspects stated above and the principal factors for IDBT evolution, including their selection, contribution and sequence in this thesis. By our analysis, IDBT evolved ...

n the twenty years that preceded 1920 I there was a 245 percent increase in the average per-acre price of farmland (including improvements) before land values fell sharply. Today’s escalation in land values-364 percent between 1957 and 1977-prompts some pointed questions: Have land prices reached their peak? If not, when will they plateau, if ever? Will they then decline and, if so, will the de...

The mechanisms by which different factors affect the maximal acid secretion of the stomach are discussed with particular reference to nationality, sex, age, body weight or lean body mass, procedural details, mode of calculation, the nature, dose and route of administration of a stimulus, the synergistic action of another stimulus, drugs, hormones, electrolyte levels, anaemia or deficiency of th...

Consumer interest in local foods has increased sharply, including both fresh and processed products. As such, appropriate marketing strategies need to be developed at the firm and/or association level to effectively capture this growing demand. For example, the New York Wine and Grape Foundation has expended significant efforts recently in funding research and outreach programs aimed at helping...

BACKGROUND AND PURPOSE The ability to predict future strokes in asymptomatic patients with carotid stenosis is currently limited. The management of symptomatic patients with <50% stenosis is also debatable. In this context, we performed the following open prospective study to identify factors affecting symptomatology in patients with carotid stenosis. METHODS During 1988-1997, 442 arteries wi...