Genetically effective and adult population sizes in the Apache silverspot butterfly, Speyeria nokomis apacheana (Lepidoptera: Mynphalidae)

Genetically effective and adult population sizes of the Apache silverspot butterfly ( Speyeria nokomiis apacheana ) from the Great Basin of North America were tracked from 1991 to 1997. Speyeria nokomis inhabits mesic habitats in the Great Basin, and its recent declines in abundance have raised concerns about its future persistence. Adult population size estimates determined from mark-recapture methods ranged from 100 to 1900 individuals from 1993 through 1997. Genetically effective population sizes based on temporal changes in allozyme frequencies ranged from less tha 1 individual to 20 individuals between 1991 and 1995. Despite these small annual estimates, it is likely that gene flow resulted in overestimation of genetically effective population sizes. These reusuts, combined with observations in the field, suggest that suitable but vacan habitat patches be maintained for potential recolonization by S. n. apacheana.     

Resident Utah deer hunters' preferences for management options

A total of 3291 resident deer hunters returned questionnaires distributed at checking stations in fall 1989 and 1990 providing opinions and management data concerning the Utah rifle hunt. Hunters reported hunter crowding and too few big bucks as critical reasons for possibly choosing to quit deer hunting in Utah. Indeed, hunter age structure and measured satisfaction suggested a negative future trend in hunter participation. Results suggested the adoption of several hunter-preferred management options would increase satisfaction, motivation, and success.     

Fat depth at the xiphoid process--a rapid index to deer condition

Vegetal composition was determined during 1974 and 1984 using 60 permanent 50 m 2 plots within a mature pinyon-juniper community in northeastern Utah. Results indicated that not only was there little significant change in community composition, but with many species frequency and density remained nearly the same during the decade.     

Late summer changes in mule deer diets with increasing use on bitterbrush rangeland

Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} Late summer diet composition of mule deer was determined daily within a mountain browse enclosure dominated by antelope bitterbrush. Palatable forages of low abundance were rapidly depleted, and bitterbrush continually composed over 50% of the diet, even at utilization exceeding 350 deer-days/ha. The relationship of bitterbrush forage production and deer-days use is discussed.     

DNA electrophoresis in microlithographic arrays.

We have used optical microlithography to fabricate capped quasi-two-dimensional obstacle courses in SiO2. We report here observations using epifluorescence microscopy of the electrophoresis and length fractionation of large DNA molecules confined in arrays. Simple reptation theory, based on the work of deGennes, predicts that at low electric fields the electrophoretic mobility of a polymer of length L much greater than the persistence length p scales inversely with L (ref. 2). But elongation of the coil in the matrix at sufficiently strong electric fields results in a length-independent electrophoretic mobility. The application of suitably timed pulsed electric fields restores the fractionating power of gels for long molecules but the protocols of pulsed-field electrophoresis are semi-empirical because the complex and ill-understood gel matrix plays a critical role in fractionation. Microlithographically constructed obstacle arrays, with their low dimensionality, small volume and extremely reproducible topography, will make it possible to understand the motion and fractionation of large polymer molecules in complex but well characterized topologies.     

Oncogenic properties of PPM1D located within a breast cancer amplification epicenter at 17q23

We found that PPM1D, encoding a serine/threonine protein phosphatase, lies within an epicenter of the region at 17q23 that is amplified in breast cancer. We show that overexpression of this gene confers two oncogenic phenotypes on cells in culture: attenuation of apoptosis induced by serum starvation and transformation of primary cells in cooperation with RAS.     

Dose-related enhancement of erythropoiesis by sulfhydryl compounds and its reversal with a thiol inhibitor

Summary Erythropoietin-mediated erythrocyte development from bone marrow of hypertransfused rats was significantly greater when the culture medium contained an optimal dose of certain sulfhydryls. This stimulatory action was attributed to the presence of SH groups because erythroblast numbers fell to control levels when the culture contained the thiol inhibitor, p-hydroxymercuribenzoate.     

Political forecasting as a management tool

Political forces in developing countries permeate and significantly shape the business environment. Yet the political information used by managers is usually general, subjective and superficial. Managers lack an appropriate analytical framework for systematically examining political factors and forecasting their impact on the firm. This paper attempts to present such a framework. The framework focuses on the impact of political forces on development strategies, public policies and policy instruments. It then discusses how the analysis of these factors can be made managerially relevant by integrating them with firm specific characteristics and corporate strategy. This approach departs from many of the traditional political forecasting techniques which only concentrate on macro-level factors and indicators.