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Nomenclatura Unesco > (55) Historia

Mostrando recursos 161 - 180 de 145,259

161. Resource predictability and host specificity in fleas: the effect of host body mass - B. R. Krasnov; S. Morand; D. Mouillot; G. I. Shenbrot; I. S. Khokhlova; R. Poulin
Ecological specialization is hypothesized to result from the exploitation of predictable resource bases. For parasitic organisms, one prediction is that parasites of large-bodied host species, which tend to be long-lived, should specialize on these hosts, whereas parasites of small host species, which represent more ephemeral and less predictable resources, should become generalists.We tested this prediction by quantifying the association between the level of host specificity of fleas and the mean body mass of their mammalian hosts, using published data from 2 large, distinct geographical regions (South Africa and northernNorth America). In general, we found supporting evidence that flea host specificity,...

162. Long-term Study of Group Dynamics and Female Reproduction in Venezuelan Pithecia pithecia - Marilyn A. Norconk
White-faced sakis (Pithecia pithecia) are well known for their specialized feeding strategy and dependence on seed-eating, but we know less about so-cial dynamics and reproduction. I summarize data from 1990 to 2001 on sakis inhabiting a small island in Lago Guri, Venezuela that includes changes in group composition, aggressive behavior, and female reproductive histories. Though the characteristic group size and typical mating system are still un-certain for wild, free-ranging Pithecia spp., size of the study group ranged from 2–3 adult females and 1–4 adult males. My group and I collected fecal samples from adult females, which we dried and assayed...

163. Investigation of a Psychosocial Hypothesis in Appendectomies - Eugene Meyer; H. Thomas Unger; Regina Slaughter
For a population of 389 patients operated for the primary diagnosis of appen-dicitis, the prediction was made that female patients between the ages of 10 and 29 years would have more normal appendices removed than would male patients of the same age. It was also predicted that the young female patient who had a normal appendix removed would have more illness in the 10 years following ap-pendectomy than one who had a pathological appendix removed. This prediction was based on the assumption that the "normal-appendix " population would con-tain more young women who would continue to translate emotional distress into...

164. Development of mother-infant relationships and infant behavior in wild blue monkeys (Cercopithecus mitis stuhlmanni - Marina Cords
A characteristic feature of primate life histories is the prolonged period of postnatal development in which newborns depend on adults, especially their mothers, for nutrition, transport, and protection, and develop social skills that enable them to become fully integrated members of society. Many

165. Through Bulkhead Initiator Studies - David R. Begeal
This report describes recent work done to demonstrate feasibility of a fail-safe Through Bulkhead Initiator with minimum dimensions and suitable for use in cyclical thermal environments. Much of the ground work for a fail-safe TBI was previously done by A. C. Schwartz.1 This study is an expansion of Schwartz’s work to evaluate devices with bulkheads of 304 stainless steel and Inconel 718; explosive donors of PETN, BNCP, and a 0.005 inch thick steel flying plate donor traveling at 2.6 mm/s; and explosive acceptors of PETN and BNCP. Bulkhead thickness were evaluated in the range of 0.040 to 0.180 inch. The...

166. AN EMPIRICAL EXAMINATION OF MANAGEMENT OF REAL OPTIONS IN THE U.S. VENTURE CAPITAL INDUSTRY - Isin Guler
This study empirically examines how firms manage real options over time in the context of the U.S. venture capital industry. It tracks the venture-capital funding histories of U.S. portfolio companies founded during 1989-1993, and their outcomes, until 2004. An examination of sequential investments suggests asymmetries in the management of successful and unsuccessful companies. Signals of a company’s progress, such as the number of its patents, are significant predictors of VC investment practices in the case of successful companies, but not in the case of unsuccessful companies. In contrast, VC firm characteristics, such as experience in the company’s industry, IPO experience,...

167. P235-WE GEOCHEMICAL CHARACTERIZATION OF THE ASPHALTITE VEINS FROM THEŞIRNAK AREA IN SOUTHEASTERN TURKEY: THEIR USE AS ARCHAEOLOGICAL MATERIAL - Ohran Kavak; Jacques Connan; M. Namık Yalçin; Brian Jarvie
Asphaltic-like veins in southeastern Turkey were mapped and studied till 1969 by Lebküchner and Orhun. They originated from the filling of open cracks in thrust faults and faulted anticline where enormous amounts of asphaltic materials were squeezed towards surface (Lebküchner et al., 1972). They have been extensively mined as alternative solid fuel. At a first glance the easy accessible asphaltites may have been mined in antiquity to be used as bitumen which is present on potsherds in some antic sites, e.g. Kütnüs Höyük, Nervan Höyük and Takyan Höyük, located southward of the asphaltite vein district. In order to cover a...

168. Disorders of thought are severe mood disorders: the selective attention defect in mania challenges the Kraepelinian dichotomy—a review - C. Raymond Lake
Kraepelin said severe mental illness was due to 2 diseases subsequently characterized as disorders of thought vs dis-orders of mood, ie, the Kraepelinian dichotomy. Schizo-phrenia, traditionally considered the disorder of thought, has been defined by the presence of hallucinations, delu-sions, catatonia, and disorganization. Tangentiality, de-railment, loose associations, and thought blocking are typically considered pathognomonic of schizophrenia. By contrast, the mood disorders have been characterized only as disorders of the emotions, though both depression and mania, when severe, are now recognized to include the same psychotic features traditionally considered diagnostic of schizophrenia. This article addresses disordered thinking in mania in order...

169. $rec.titulo
pharynx, which was remarkably higher (P = 0.042) than that in the patients without stomach ailment history (1 case, which was 2.9%). CONCLUSION: H pylori may not be detected in the pharynx of healthy people. Chronic pharyngitis may be related to H pylori infection. The infection rate with H pylori in the pharynx is higher in patients with stomach ailment histories than in patients without stomach ail-ment histories, suggesting that chronic pharyngitis may be related to stomach ailment history.

170. 1 DECIPHERING NORTH AMERICAN PLEISTOCENE EXTINCTIONS - Donald K. Grayson
The debate over the cause of North American Pleistocene extinctions may be further from resolution than it has ever been in its 200 year history and is certainly more heated than it has ever been before. Here, I suggest that the reason for this may lie in the fact that paleontologists have not heeded one of the key biogeographic concepts that they themselves helped to establish: that histories of assemblages of species can be understood only be deciphering the history of each individual species within that assemblage. This failure seems to result from assumptions first made about the nature of...

171. Gone, But Not Forgotten: The Current State of Private Computing - Aseem Rastogi; Jun Yuan; Rob Johnson
Abstract—Private data comes in many forms: web browser histories, chat logs, sensitive word processor documents, net-work proxy logs, and many more. Some applications – pri-marily web browsers – now support private modes that aim to prevent sensitive information leaks. There are two problems with this application-level approach. First, there are many software engineering challenges in implementing correct and complete private modes. More fundamentally, applications cannot always tell which data is private – this is up to the user. As a result, applications that do support private modes may not implement the user’s desired policy, and many other applications that process...

172. Reflections on Displacement
Displacements of various kinds, overlaying one another across time and space, litter Zimbabwe’s histories and geographies, while adding new layers to ongoing relationships with neighbouring

173. Private Monitoring with Infinite Histories," mimeo - Christopher Phelan; Andrzej Skrzypacz
This paper develops new recursive methods for studying stationary sequential equilibria in games with private monitoring. We first consider games where play has occurred forever into the past and develop methods for analyzing a large class of stationary strategies, where the main restriction is that the strategy can be represented as a finite automaton. For a subset of this class, strategies which depend only on the players ’ signals in the last k periods, these methods allow the construction of all pure strategy equilibria. We then show that each sequential equilibrium in a game with infinite histories defines a correlated...

174. Journal of Agricultural and Applied Economics, 28,1(Ju1Y 1996):135-147 @ 1996 Southern Agricultural Economics Association Effect of Liberalized U.S.-Mexico Dry Onion Trade: A Spatial and- “ ‘ “ Equilibrium Analysis - Stephen Fuller; Melanie Gillis; A. Ziari
A spatial, intertemporal equilibrium model of the North American dry onion economy is constructed to analyze the impact of liberalized U.S.-Mexico trade. In a free-trade environment, exports of Mexi-can onions to the U.S. are projected to increase about 509Z0,while Mexico’s share of the U.S. market increases from 8.7 to 12.8’%. Farm-level prices in the U.S. are projected to decline 8.!)~o, while production declines 2.4%. The effect of free trade on U.S. producers is disproportional across re-gions. Northwest storage onion producers experience the greatest decline in production; however, analysis suggests that improved storage methods may offset a portion of the unfavorable...

175. DOI: 10.1093/aje/kwg136 PRACTICE OF EPIDEMIOLOGY Validation of Self-reported Screening Mammography Histories among Women with and without Breast Cancer - Ra A. Norman; A. Russell Localio; Lan Zhou; Leslie Bernstein; Ralph J. Coates; Elaine W. Flagg; Polly A. Marchbanks; Kathleen E. Malone; Linda K. Weiss; Nancy C. Lee; Marion R. Nadel
As part of a case-control study of the efficacy of screening mammography, the authors validated the mammography histories of 2,495 women aged 40–64 years with incident breast cancer diagnosed in 1994–1998 and a 25 % random sample of 615 controls never diagnosed with breast cancer, all reporting a mammogram in the past 5 years. Subjects from five metropolitan areas of the United States were cross-classified by facility records (“gold standard”) and self-report according to history of a recent screening mammogram (within 1 year or within 2 years). Sensitivity and specificity of self-reported screening at 1 year were 0.93 and 0.82,...

176. Developmental idealism and family and demographic change - Arland Thornton; Dimiter Philipov
In this paper we provide new explanations for the dramatic family and demographic changes in Central and Eastern Europe following the political transformations of the late 1980s and early 1990s. Following these political transformations there were substantial changes in family and demographic beliefs and values, dramatic declines in marriage and childbearing, significant increases in nonmarital cohabitation and childbearing, and a movement from reliance on abortion to a reliance on contraception for fertility limitation. Although many explanations have been offered for these family and demographic trends, we offer a new set of explanations based on ideational influences and the intersection of...

177. International Debt Sustainability Reconciling Debt Intolerance with Original Sin - Julia Nicole Thornton
In the recent literature on debt sustainability, two competing viewpoints have emerged addressing the underlying causes of many emerging market countries ’ difficulty in sustaining their debt. Carmen Reinhart, Kenneth Rogoff, and Miguel Savastano, authors of the 2003 article “Debt Intolerance, ” argue that institutional weaknesses, evidenced by histories of default and inflation, are the root causes of many countries ’ inability to sustain advanced country levels of debt, or debt intolerance. On the other hand, Barry Eichengreen, Ricardo Hausmann, and Ugo Panizza, authors of the 2003 article “The Pain of Original Sin, ” argue that while institutional history certainly...

178. RS2003/04-002: Occupational Risk Identification for Ovarian Cancer - Dr. Nhu Le
The purpose of this research is to identify potential carcinogens in the BC work environment for the ovarian cancer. Relatively little work has been done concerning occupational risk factors in ovarian cancer and suspected carcinogens have not been identified due to the lack of detailed exposure assessment at the individual levels. Mortality studies with BC women have shown elevated risks in teachers, nurses, and in hairdressers. Moreover, women at the present time constitute about one-half the BC workforce, and in the past 10 years have moved heavily into non-traditional jobs. For these reasons, women are potentially more exposed to occupational...

179. Thermal history and oil charge on the UK Atlantic margin - J. Parnell; P. F. Green; G. Watt; D. Middleton
ABSTRACT: Integrated apatite fission track analysis and vitrinite reflectance data show that well 204/19-1 in the West of Shetland region, UK Atlantic margin, has experienced only limited additional burial beyond present-day depths. Uplift and cooling to present-day levels probably occurred during late Cenozoic (Eocene to Miocene) basin inversion. Fluid inclusion data indicate that Paleocene–Eocene sandstones have experienced temperatures much higher than can be explained by burial alone. Temperatures up to 200C indicate the passage of hot fluid through Cenozoic sandstones, which by-passed the pre-Cenozoic section in this and other wells. The hot fluid event must have been of very brief...

180. German Economics Journals - Laureano Figuerola; De Historia Económica; Jordi Pons Novell; Daniel A. Tirado Fabregat; Jordi Pons Novell (a; Daniel A. Tirado Fabregat (b
Number 05-08

 

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