Digital Commons Network^™

Noise Trader Risk In Financial Markets, J. Bradford Delong

J. Bradford DeLong

No abstract provided.

Substituent Effects On The Gas-Phase Acidity Of Silane, Mark S. Gordon, David E. Volk, David R. Gano

Mark S. Gordon

In a previous paper, the gas-phase acidities of XHn compounds (X= C, N, 0, F, Si, P, S, Cl) were predicted with ab initio wave functions. At the MP4 level of theory with extended basis sets (6-311++G(3df,2pd)3 for second-period atoms and 6-3l++G- (3df,2pd) for third-period atoms], the calculated gas-phase acidities for these species were determined to be within 2 kcaljmol of experimental values. Similar results for the second period were obtained by DeFrees and McLean.

Iupac 32nd International Congress On Macromolecules "Macro 88", Otto Vogl, Naohuki Koide, Tatsuki Kitayama, Koichi Hatada

Otto Vogl

No abstract provided.

Heterochronic Genes Control The Stage-Specific Initiation And Expression Of The Dauer Larva Developmental Program In Caenorhabditis Elegans, Zhongchi Liu, Victor R. Ambros

Victor R. Ambros

We report that a stage-specific developmental program, dauer larva formation, is temporally regulated by four heterochronic genes, lin-4, lin-14, lin-28, and lin-29. The effects of mutations in these four genes on dauer larva formation have revealed that they regulate two different processes of dauer larva formation: (1) a decision specifying the larval stage at which dauer larva development initiates, and (2) the specialized differentiation of hypodermal cells during dauer larva morphogenesis. Epistasis analysis has suggested a model in which lin-4 negatively regulates lin-14, and the resulting temporal decrease in lin-14 activity specifies the stage of dauer larva initiation. Our results …

Science Fiction In France: A Brief History And Selective Bibliography, Arthur Evans

Arthur Bruce Evans

No abstract provided.

Review Of "Lethal Secrets", Mirah Riben

Mirah Riben

No abstract provided.

Presence Of A Cs-Resistant Transient Outward Current Which Distorts Ica Measurements In Guinea-Pig Single Ventricular Cells, Georges Christé, Brigitte Delachapelle, Fouad Lemtiri-Chlieh, Carlos Ojeda

fouad Lemtiri-Chlieh

To correctlyr analyse the physical properties of ion channels and the actions of drugs upon them, it is important that the membrane conducts only the ionic species believed permeant. In guinea-pig ventricular cells it has been assumed that only ICaL flows in the potential range -50 to +60 mV in the presence of intra- and extracellular Cs (> 20 mM). We report here that this is not the case due to the presence of a Cs-insensitive, transient outward current.

Measurements Of Cytosolic Free Ca In Cultured Rat Neonate And Adult Guinea-Pig Ventricular Cardiac Myocytes, Jean-Claude Bernengo, Fouad Lemtiri-Chlieh, Carlos Ojeda, Nadine Pltonoff

fouad Lemtiri-Chlieh

Cytosolic free Ca was measured with Indo-1 (Grynkiewicz et al. 1985) as free acid (in guinea-pig cells) or as the ester (in rat neonate cells). Using image analysis we obtained concentration maps at 40 ms intervals at two wavelengths (Cannell et al. 1986). In rat neonate cells, at rest and during contraction, calcium was apparently non-uniformly distributed, in contrast to guinea-pig adult cells. Using a dual PM spectroscopic system adapted to an inverted microscope we found: (1) the conversion of Indo-AM to Indo- 1 in the cytosol is not complete (< 40% contribution to the total light); (2) rat neonate cells buffer Ca (at rest 130-170 nM) only for [Ca]. between 1 and 3 mM, whereas in adult guinea-pig cells the range extended to 10 mM; (3) during contraction [Ca]i rose from 200 nm to no more than 1 microM. Digitoxin increases basal and peak [Ca]i; (4) during spontaneous contractions, in guinea-pig cells, [Ca]i rises from 70 to 200 nm when [Ca]o = 0, and from 170 nm to about 1 microM when [Ca]o = 2 mM; (5) in voltage-clamp conditions the rise in [Ca]i does not exceed 2 microM and oscillations occur in the presence of forskolin. When loading with Indo-1, cells frequently cease to contract (Powell et al. 1988) and the variations in [Ca]i are then very small (about 200 nm at peak ICa). In both cases these values are small compared to the total charge crossing the membrane.

Pig Vocalizations Under Selected Husbandry Practices, Hongwei Xin, James A. Deshazer, D. W. Leger

Hongwei Xin

Acoustical characteristics of vocalizations of sows, piglets, and nursery pigs under selected husbandry practices were analyzed with a digital signal processing system. The duration (D) and major energy-resonance frequency (P) for each call were determined as follows: a) processing of piglets (D = 0.81 s and f* = 3 700 Hz); b) food anticipation of breeding-gestation sows (2.50 s and 3 000 Hz); c) isolation of piglet (0.34 s and 500, 3 500 Hz); d) startling of nursery pigs (0.29 s and 900 Hz); e) sows in heat (3.07 s and 1 375 Hz); f) farrowing (0.10 s and 3 …

The Effects Of Site Quality On Breeding-Site Fidelity In Bobolinks, Eric K. Bollinger, Thomas A. Gavin

Eric K. Bollinger

We compared breeding-site fidelity of Bobolinks (Dolichonyx oryzivorus) at two low-quality sites (Bald Hill and Shackelton Point, BH +SP) with that at one high-quality site (Moore Road, MR) in central New York. Yearly density of fledglings at Moore Road was more than six times the density at Bald Hill and Shackelton Point. Furthermore, individual residents fledged 50-70% more young at the high-quality site. At Moore Road, 70% of the males and 49% of the females returned one or more times, compared with 44% of the males and 25% of the females at the low-quality sites. Successful residents (i.e. those fledging …

Treatment Modality And Quality Differences For Black And White Breast Cancer Patients Treated In Community Hospitals, Paula Diehr

Paula Diehr

This study assessed the relationship of race and patterns of care, defined by an expert NCI-appointed committee, for 7,781 patients with breast cancer treated in 107 hospitals in 45 communities between 1982 and 1985. After control for age and stage of disease, black patients had significantly different care from white patients for four of the ten patterns examined. They were less likely to have a progesterone receptor assay or to be referred for postmastectomy rehabilitation, two patterns deemed desirable for all patients. Black patients were also more likely to receive liver scans and radiation therapy in situations in which these …

Lonergan On The Catholic University, Richard M. Liddy

Richard M Liddy

No abstract provided.

Student Perceptions Of The Relative Importance Of Selected Attributes Of An Institution Of Higher Education: A Conjoint Approach, John Fraas, Ronald Paugh

John W. Fraas

A study investigated the relative importance of certain college attributes to the freshmen of Ashland University, a small, private university in Ohio. Five institutional characteristics were examined: availability and variety of financial aid, dorm life (living conditions and food quality), quality of education (quality of teaching, career relevance of the curriculum, and overall institutional reputation), student-faculty relationships and interaction (availability of faculty to students, faculty promotion of student development, and degree of faculty advice given to students on personal as well as academic matters), and campus social life.

The Problem Of Transaction Costs, Pierre Schlag

Pierre Schlag

No abstract provided.

El Municipio Y La Organización Del Estado En Ecuador, Fernando Carrión Mena

Fernando Carrión Mena

El proceso de urbanización en el Ecuador se rige por la lógica concentradora y excluyente, propia del tipo de desarrollo capitalista en nuestras naciones, se expresa entre otras cosas, en la desarticulación de la red urbana, el ilimitado crecimiento de las ciudades grandes por sobre el resto de los asentamientos humanos, la profundización de los desequilibrios y desigualdades a todo nivel (social, intraurbano y ecológico), el predominio de la población urbana sobre la rural, etc.

Esta expresión fenoménica de la urbanización ecuatoriana tiende a acrecentarse desde los años sesenta y con mayor énfasis desde el "boom petrolero" en 1972. Ello …

Statutes Versus Enforcement: The Case Of The Optimal Speed Limit, Philip E. Graves, Dwight R. Lee, Robert L. Sexton

PHILIP E GRAVES

There was no abstract for this paper.

Isolation And Partial Characterization Of The Glutamate/Aspartate Transporter From Pea Leaf Mitochondria Using A Specific Monoclonal Antibody, Jeevalatha Vivekananda, David J. Oliver

David J. Oliver

A library of monoclonal antibodies directed against the proteins of the inner mitochondrial membrane was screened for antibodies that could bind to the glutamate/aspartate transporter of pea mitochondria and thereby inhibit its activity. One antibody, 2C7, had the property of inhibiting glutamate and aspartate-dependent oxaloacetate metabolism by pea mitochondria without affecting the metabolism of other substrates. The antibody specifically recognized a 21,000 dalton protein, which was tentatively identified as the glutamate/aspartate transporter. The antibody was used to follow the extraction of this protein by Triton X-114 and cardiolipin and the partial purification of the protein by centrifugation and chromatography on …

Equatorial F-Regionvertical Plasma Drifts During Solar Maxima, Bela G. Fejer, E. R. De Paula, I. S. Batista, E. Bonelli, R. F. Woodman

Bela G. Fejer

Incoherent scatter radar measurements at Jicamarca are used to study the effects of large solar fluxes and magnetic activity on the F region vertical plasma drifts. The average drifts from the two last solar maxima are almost identical except in the late afternoon-early evening sector where their variations with solar flux and magnetic activity are strongly season dependent. The average evening winter (May-August) drifts appear to remain almost constant after a certain solar flux level is reached but increase with magnetic activity. The equinoctial evening drifts increase systematically with solar-flux but decrease with magnetic activity. Very large prereversal enhancement velocities, …

A Prospective Study Of Disordered Eating Among College Students, Ruth H. Striegel-Moore, Lisa R. Silberstein, Peter Frensch, Judith Rodin

Ruth Striegel Weissman

Statutes Versus Enforcement: The Case Of The Optimal Speed Limit, Philip E. Graves, Dwight R. Lee, Robert L. Sexton

Robert L Sexton

There was no abstract for this paper.

Statutes Versus Enforcement: The Case Of The Optimal Speed Limit, Philip E. Graves, Dwight R. Lee, Robert L. Sexton

Robert L Sexton

There was no abstract for this paper.

Economic Analysis Of Legal Disputes And Their Resolution, Robert D. Cooter, Daniel L. Rubinfeld

Robert Cooter

No abstract provided.

La Investigación Urbana En El Ecuador, Fernando Carrión Mena

Fernando Carrión Mena

Con el trabajo se busca realizar un balance del trayecto seguido por la investigación regional y urbana en el país y del estado en que se encuentra. Para ello se parte de la definición del "momento fundacional" del campo (principios de la década del ochenta), a través de ciertos antecedentes históricos que confluyen cuando el proceso de urbanización se acelera en el país, las ciencias sociales se fortalecen y los agentes sociales que la conducen y consumen se forman. Posteriormente y bajo dos entradas metodológicas diversas, la una que clasifica la bibliografía en función de dos paradigmas fundamentales y la …

"Does It Make A Difference Whether Party Control Of The American National Government Is Unified Or Divided?" At Annual Conference Of Apsa, San Francisco, David R. Mayhew

David Mayhew

No abstract provided.

Extraction Of Knowledge About The Cognitive Process Of Browsing From Discourse And Thinking-Aloud Protocols. Also Published As Part Of: Kwasnik, B. Et Al Automatic Knowledge Extraction From Dictionary Text: Project Development., Barbara H. Kwasnik, Elizabeth D. Liddy, Myaeng H. Sung

Barbara H. Kwasnik

No abstract provided.

Random Sequential Adsorption Of Unoriented Rectangles Onto A Plane, R. Dennis Vigil, Robert M. Ziff

R. Dennis Vigil

Random sequential adsorption of nonoverlapping rectangles of arbitrary orientation onto a continuous plane was investigated by computer simulation. The approach to the jamming limit was found to obey Feder's law for a wide range of rectangle aspect ratios. The coverage fraction at the jamming limit was found to depend upon the aspect ratio of the adsorbed rectangles, with a maximum in the jamming coverage occurring at aspect ratios ~2.

Image Segmentation Using Human Visual System Properties With Applications In Image Compression, Heidi A. Peterson, Sarah A. Rajala, Edward J. Delp

Sarah A. Rajala

Many image compression techniques involve segmentation of a gray level image. With such techniques, information is extracted that describes the regions in the segmented image, and this information is then used to form a coded version of the image. In this paper we present a region-growing-based segmentation technique that incorporates human visual system properties, and describe the use of this technique in image compression. We also discuss the effect of requantizing a segmented image. Requantization of a segmented image is useful because it can lead to a reduction in the number of bits required to code the description of the …

Finite-Temperature Defect Properties From Free-Energy Minimization, Richard Alan Lesar, R. Najafabadi, D. J. Srolovitz

Richard Alan Lesar

We present two simple, but accurate, techniques for calculating the finite-temperature atomic structure and free energy of any solid defect (point or extended). The finite-temperature equilibrium atomic structure and thermodynamic properties of defects in solids are obtained self-consistently by minimizing the rree energy of the solid with respect to the coordinates of the atoms. Application of the two methods to a perfect crystal and one with a vacancy show that both methods yield excellent agreement with Monte Carlo calculations for temperatures up to at least 75% of the melting point.

Cooperation In A Repeated Prisoner's Dilemma With Ostracism, Eric Bennett Rasmusen, David Hirshleifer

Eric Bennett Rasmusen

The unique Nash equilibrium of the finitely repeated n-person Prisoners' Dilemma calls for defection in all rounds. One way to enforce cooperation in groups is ostracism: players who defect are expelled. If the group's members prefer not to diminish its size, ostracism hurts the legitimate members of the group as well as the outcast, putting the credibility of the threat in doubt. Nonetheless, we show that ostracism can be effective in promoting cooperation with either finite or infinite rounds of play. The model can be applied to games other than the Prisoners' Dilemma, and ostracism can enforce inefficient as well …

Toxicology Of Synthetic Pyrethroids In Aquatic Organisms: An Overview, Steven P. Bradbury, Joel R. Coats, D. M. Symonik, S. D. Dyer, L. K. Timson, G. J. Atchison

Steven P. Bradbury

The aquatic toxicology of the photostable synthetic pyrethroid insecticides as it affects two important groups of susceptible organisms — fish and aquatic insects — is discussed. The sensitivity of these aquatic species to the pyrethroids is dependent on several factors, including toxicokinetics, target site (nervous system), sensitivity and possible secondary mechanisms of action, as well as chemical and physical properties of the aquatic medium that influence toxicity and bioavailability. Uptake rates and routes of fenvalerate greatly affected the toxicity of fenvalerate to mosquito larvae. LD50 values were determined for cuticular and dietary exposure routes by utilizing radiolabeled fenvalerate at the …