Mating has opposite effects on male and female sexually selected cuticular hydrocarbons

In Drosophila serrata flies, there is female choice for male cuticular hydrocarbon (CHC) profiles and male choice for female CHC profiles. Furthermore, both males and females can alter their CHCs: when there is more opportunity for mating, males express combinations of CHCs preferred by females; however, females appear to change CHC profiles to avoid male harassment. In this study, I investigate the effect of number of matings (0–4) on male and female sexually selected CHCs. Mating caused males to express CHCs associated with higher male mating success. Thus, successfully mating males are likely to have increased future mating success. Conversely, females that mated more times expressed CHC profiles that were associated with lower female mating success. Females maximized their offspring production by mating more than once, but additional matings did not provide additional benefits. Furthermore, number of matings did not affect female survival. In total, these results suggest that females alter CHC expression to discourage male courtship when additional matings are not beneficial. In conclusion, plasticity in male and female CHC expression can both increase variance in male mating success and decrease variance in female mating success, driving the evolution of sexually selected chemical signals

Characterization of interstitial stem cells in hydra by cloning

A procedure has been developed for cloning interstitial stem cells from hydra. Clones are prepared by introducing small numbers of viable cells into aggregates of nitrogen mustard-inactivated host tissue. Clones derived from added stem cells are identified after 1–2 weeks of growth by staining with toluidine blue. The incidence of clones increases with increasing input of viable cells according to one-hit Poisson statistics, indicating that clones arise from single cells. After correction for cell losses in the procedure, about 1.2% of the input cells are found to form clones. This compares with estimates from in vivo experiments of about 4% stem cells in whole hydra [David, C. N., and Gierer, A. (1974). Cell cycle kinetics and development of Hydra attenuata. III. Nerve and nematocyte differentiation. J. Cell Sci. 16, 359–375.] Differentiation of nematocytes and nerve cells in clones was analyzed by labeling precursors with [3H]thymidine and scoring labeled nerves and nematocytes 2 days later. Nine clones examined in this way contained both differentiated nerve cells and nematocytes, demonstrating that the interstitial stem cell is multipotent. This result suggests that the observed localization of nerve and nematocyte differentiation in whole hydra probably occurs at the level of stemcell determination. The observation that differentiated cells occur very early in clone development suggests that a stem cell's decision to proliferate or differentiate is regulated by shortrange feedback signals which are already saturated in young clones

Job Growth and the Quality of Jobs in the U.S. Economy

During the 1980's employment grew rapidly in the United States, prompting many analysts to label the U.S. economy the great American job machine. But while aggregate employment increased rapidly during the 1980's, many did not benefit from the expansion. Among less educated prime-age males, unemployment rates rose and labor force participation rates declined sharply. Moreover, although job growth was high, many argued that the quality of American jobs as measured by wages, benefits, and job security deteriorated. The decline of jobs in the high-paying manufacturing sector and the growth of jobs in the low-paying services sector, the growth in part-time and temporary employment, and the general decline in real wages among less-educated, less-skilled workers have been presented as evidence of an erosion in job quality. The issue of job growth and job quality in the American economy has sparked extensive debate among policymakers and academics over the last decade. The aim of this paper is to critically examine the evidence on job growth and on wages and other indicators of job quality in the U.S. economy during the 1980's and 1990's. To place the American experience in perspective, selected comparisons are made to the experiences in other industrialized countries. The paper is divided into three main sections. In section 1, I look at employment growth in the United States during the 1980's and 1990's. I examine whether and to what extent employment growth was greater in the United States than in other industrialized countries and whether strong employment growth in the United States signaled a healthy economy. I compare the employment performance of the U.S. economy during the 1980's with that in other industrialized countries, and study the factors underlying the cross-country differences in employment growth: differences in the growth of the working age population, differences in the growth in labor force participation, and differences in the growth in unemployment. I also examine differences in the employment experiences across groups of workers defined by gender, education, and age within the United States. In addition, the relation between employment growth, productivity growth, and growth in per capita GDP in the United States and other industrialized countries during the 1980's is explored. Finally, trends in employment growth in the United States during the 1990's are discussed. In sections 2 and 3 of the paper, I examine whether and in what sense there is any evidence that the quality of jobs in the United States has declined. The literature pertaining to trends in the quality of jobs in the U.S. economy falls into at least two main categories: (1) studies of the wage, benefits, and job security characteristics of new jobs created; and (2) studies of trends in real wages, benefits, and earnings inequality. The latter deals with trends in new as well as existing jobs. In section 2 of the paper, I review evidence from several studies on the wage distribution of occupations and industries in which new employment was created during the 1980's and 1990's. I also look at trends in the growth of involuntary part-time employment and temporary employment, which are characterized by low wages, few benefits, and little job security. In section 3 of the paper, I present evidence on trends in wages and benefits across groups of workers and the growth of wage inequality in the United States during the 1980's and 1990's. I review evidence concerning the causes of the decline in real wages among less-educated workers and the growth in wage inequality in the United States. I also review evidence from studies of trends in real wages and wage inequality in other industrialized countries and discuss why trends abroad typically have differed from those in the United States. In section 4, I summarize the evidence on job growth and the quality of jobs in the United States during the 1980's and 1990's and discuss the implications for U.S. policy.job, growth, quality, expansion, Houseman

New Developments in Gaming Taxation and Regulation: an Update

The gaming industry is facing increased regulatory interest. Congress has authorized a commission to investigate gaming in the United States. The Internal Revenue Service continues to interpret ambiguous areas of the tax code in an attempt to raise gaming tax revenues. Regulatory changes in currency transaction reporting have also resulted in some significant changes for the industry. The purpose of this paper is to provide an update on tax and regulatory issues currently facing the gaming industry. Specifically, the paper will address tax and regulatory developments in: (a) tip compliance, (b) cash transaction reporting, (c) complimentaries, (d) employee cafeterias, (e) outstanding chips and tokens, (e) marker discounts, and (f) high-denomination slot win reporting

Civil Procedure as a Critical Discussion

This Article develops a model for analyzing legal dispute resolution systems as systems for argumentation. Our model meshes two theories of argument conceived centuries apart: contemporary argumentation theory and classical stasis theory. In this Article, we apply the model to the Federal Rules of Civil Procedure as a proof of concept. Specifically, the model analyzes how the Federal Rules of Civil Procedure function as a staged argumentative critical discussion designed to permit judge and jury to rationally resolve litigants’ differences in a reasonable manner. At a high level, this critical discussion has three phases: a confrontation, an (extended) opening, and a concluding phase. Those phases are the umbrella under which discrete argumentation phases occur at points we call stases. Whenever litigants seek a ruling or judgment, they reach a stasis—a stopping or standing point for arguing procedural points of disagreement. During these stases, the parties make arguments that fall into predictable “commonplace” argument types. Taken together, these stock argument types form a taxonomy of arguments for all civil cases. Our claim that the Federal Rules of Civil Procedure function as a system for argumentation is novel, as is our claim that civil cases breed a taxonomy of argument types. These claims also mark the beginning of a broader project. Starting here with the Federal Rules of Civil Procedure, we embark on a journey that we expect to follow for several years (and which we hope other scholars will join), exploring our model’s application across dispute resolution systems and using it to make normative claims about those systems. From a birds-eye view, this Article also represents a short modern trek in a much longer journey begun by advocates in city states in and near Greece nearly 2500 years ago

Examining the relationship between leaders' power use, followers' motivational outlooks, and followers' work intentions

From the foundation of self-determination theory and existing literature on forms of power, we empirically explored relationships between followers' perceptions of their leader's use of various forms of power, followers' self-reported motivational outlooks, and followers' favorable work intentions. Using survey data collected from two studies of working professionals, we apply path analysis and hierarchical multiple regression to analyze variance among constructs of interest. We found that followers' perceptions of hard power use by their leaders (i.e., reward, coercive, and legitimate power) was often related to higher levels of sub-optimal motivation in followers (i.e., amotivation, external regulation, and introjected regulation). However, followers who perceived their leaders used soft power (i.e., expert, referent, and informational power) often experienced higher levels of optimal motivation (i.e., identified regulation and intrinsic motivation), but further investigation of soft power use is warranted. The quality of followers' motivational outlooks was also related to intentions to perform favorably for their organizations.Published versio

Do temporary jobs help low-skilled workers? : surprising data from Detroit

Because Detroit randomly assigns its welfare-to-work clients to different contractors — some favoring temporary jobs, some not — the researchers were able to uncover surprising data on whether temping helps the disadvantaged build careers.Temporary employees ; Public welfare

Does Employment Protection Inhibit Labor Market Flexibility? Lessons from Germany, France and Belgium

Laws in most West European countries give workers strong job rights, including the right to advance notice of layoff and the right to severance pay or other compensation if laid off. Many of these same countries also encourage hours adjustment in lieu of layoffs by providing prorated unemployment compensation to workers on reduced hours. This paper compares the adjustment of manufacturing employment and hours in West Germany, France and Belgium, three countries with strong job security regulations and well-established short-time compensation systems, with that in the United States. Although the adjustment of employment to changes in output is much slower in the German, French and Belgian manufacturing sectors than in U.S. manufacturing, the adjustment of total hours worked is much more similar. The short-time system makes a significant contribution to observed adjustment in all three European countries. In addition, we find little evidence that the weakening of job security regulations that occurred in Germany, France and Belgium during the 1980s affected employers' adjustment to changes in output. These findings suggest that, given appropriate supporting institutions, strong job security need not inhibit employer adjustment to changing conditions.labor, market, flexibility, Europe, France, Belgium, Germany, Abraham, Houseman

EVALUATING TELEMEDICINE TECHNOLOGIES IN RURAL SETTINGS

Changes in health care policies, demographics, and technology have presented new opportunities for the delivery of medical care services and information to rural communities. Telemedicinethe use of electronic information and communications technologies to provide and support health care when distance separates the participantshas significantly impacted the delivery of rural health care services. This paper presents an overview of the telemedicine technologies, government involvement in support of telemedicine, and issues that need to be addressed in designing an economic framework to evaluate the net benefits of telemedicine to rural communities and consumers. Federal and state governments have invested millions of support dollars in the form of equipment, infrastructure, and incentives for consumers and providers to expand the use of telecommunications in medical care. Since disbursement of these funds is already underway, it only makes sense to develop a method to determine both where and whether an additional dollar of funding for telemedicine development would be of the greatest benefit to society. If telemedicine can prove itself as a useful method for improving the likelihood of survival of rural hospitals, then, in the interest of rural development, it may be a technology worth investing in; i.e., the social benefits, measured as the sum of the private and public benefits, may outweigh the costs. According to its supporters, telemedicine systems have the potential to simultaneously address several problems characteristic of health care in rural areas, including access to care, cost containment, and quality assurance. Access can be improved by linking providers in remote areas with specialists in metropolitan centers or peers in rural areas. Telemedicine not only enables a wider range of services to be offered in the local community but may have the added effect of improving physician retention in isolated areas, one of the primary challenges in maintaining access for frontier medical centers. Telemedicine can promote cost containment through the substitution of lower-cost rural providers and facilities. Ideally, improved quality will be achieved by the ready availability of consultations and referrals. These are the potential benefits of telemedicine implementation, but they have not yet been verified by research in a field setting. An evaluation framework for telemedicine needs to be capable of modeling changes in the behavior of health care consumers (i.e., altered visitation patterns), recognizing differences in quality of service, and finally, quantifying the value of these changes. This is no small task, and obtaining the required data will likely require the cooperation of many parties, including health care providers, patients, hospital and program administrators, and policymakers. These are the same groups that could benefit greatly from a better understanding of how telemedicine technologies affect health care delivery, but a meaningful framework for analysis needs to capture the many aspects of telemedicine implementation.rural health care, telemedicine, averted costs, economic benefits, telecommunications technology, R0, Community/Rural/Urban Development, Health Economics and Policy, Research and Development/Tech Change/Emerging Technologies, I1,

A 1-W, 30-ghz, CPW Amplifier for ACTS Small Terminal Uplink

The progress is described of the development of a 1 W, 30 GHz, coplanar waveguide (CPW) amplifier for the Advanced Communication Technology Satellite (ACTS)Small Terminal Uplink. The amplifier is based on Texas Instruments' monolithic microwave integrated circuit (MMIC) amplifiers; a three stage, low power amplifier, and a single stage, high power amplifier. The amplifiers have a power output of 190 mW and 0.710 W, gain of 23 and 4.2 dB, and efficiencies of 30.2 and 24 percent for the three stage and one stage amplifiers, respectively. The chips are to be combined via a CPW power divider/combiner circuit to yield the desired 1 W of output power