Changes in survival characteristics ofDiplostomum spathaceumcercariae emerged from cadmium-exposedLymnaea stagnalis

2005 ◽  
Vol 79 (1) ◽  
pp. 55-59 ◽  
Author(s):  
N.J. Morley ◽  
M. Crane ◽  
J.W. Lewis
Keyword(s):  
Life Span ◽  
Lymnaea Stagnalis ◽  
Control Population ◽  
Survival Period ◽  
Parasite Transmission ◽  
Tail Loss ◽  
Diplostomum Spathaceum ◽  
Time Period ◽  
Potential Indicator ◽  
Over Time

AbstractThe effect of exposingLymnaea stagnalis(Gastropoda: Pulmonata), infected withDiplostomum spathaceum(Trematoda: Diplostomatidae), to 100 μg l−1cadmium for 7 days on survival characteristics (survival, tail loss, decaudized cercarial life-span) of emerged cercariae was investigated. Exposure ofL. stagnalisto cadmium resulted in significantly increasedD. spathaceumcercarial survival and an inhibited tail loss compared to controls. The normal parallel relationship which exists over time between decreasing cercarial survival and increasing tail loss in controls was changed in cercariae from cadmium-exposed hosts with an increased proportion of cercarial deaths occurring without tail loss. The decaudized cercarial life-span over the survival period of the cercarial population did not significantly change. However comparisons between individuals decaudized during the initial 24 h time period with those which were decaudized during the final period of cercarial survival showed a significantly altered life span which did not occur in the control population. As a potential indicator of penetration ‘fitness’ comparisons were also undertaken between control and exposed cercariae decaudized during the initial 24 h time period, which revealed that the decaudized cercarial life-span from the exposed hosts was significantly different from controls. This may have important implications for the ability of cercariae to migrate through the tissues of their target host. The importance and relevance of these results to parasite transmission are discussed.

scholarly journals Dynamics of life expectancy and life span equality

2020 ◽  
Vol 117 (10) ◽  
pp. 5250-5259 ◽  
Author(s):  
José Manuel Aburto ◽  
Francisco Villavicencio ◽  
Ugofilippo Basellini ◽  
Søren Kjærgaard ◽  
James W. Vaupel
Keyword(s):  
Life Expectancy ◽  
Life Span ◽  
Health Policies ◽  
Public Health Policies ◽  
Dynamic Relationship ◽  
Mortality Increase ◽  
Long Time ◽  
Underlying Causes ◽  
The Relationship ◽  
Over Time

As people live longer, ages at death are becoming more similar. This dual advance over the last two centuries, a central aim of public health policies, is a major achievement of modern civilization. Some recent exceptions to the joint rise of life expectancy and life span equality, however, make it difficult to determine the underlying causes of this relationship. Here, we develop a unifying framework to study life expectancy and life span equality over time, relying on concepts about the pace and shape of aging. We study the dynamic relationship between life expectancy and life span equality with reliable data from the Human Mortality Database for 49 countries and regions with emphasis on the long time series from Sweden. Our results demonstrate that both changes in life expectancy and life span equality are weighted totals of rates of progress in reducing mortality. This finding holds for three different measures of the variability of life spans. The weights evolve over time and indicate the ages at which reductions in mortality increase life expectancy and life span equality: the more progress at the youngest ages, the tighter the relationship. The link between life expectancy and life span equality is especially strong when life expectancy is less than 70 y. In recent decades, life expectancy and life span equality have occasionally moved in opposite directions due to larger improvements in mortality at older ages or a slowdown in declines in midlife mortality. Saving lives at ages below life expectancy is the key to increasing both life expectancy and life span equality.

scholarly journals Faculty Publishing Productivity: Comparisons over Time

2006 ◽  
Vol 67 (3) ◽  
pp. 230-239 ◽  
Author(s):  
John M. Budd
Keyword(s):  
Academic Librarians ◽  
Tenure Track ◽  
Data Set ◽  
Part Time Faculty ◽  
Time Period ◽  
Rate Of Increase ◽  
Part Time ◽  
Per Capita ◽  
Time Faculty ◽  
Over Time

Concerns about higher education abound, and these include concerns about productivity. The present study extends two previous examinations of faculty publishing productivity covering the years 1991 to 1993 and 1995 to 1997. Both members of ARL and a group of institutions included in ACRL’s data set are included. For both groups there are some increases in mean total numbers of publications, although the rate of increase has decreased since the second time period. Per capita rates of publication demonstrate an even flatter pattern. In recent years, there have been some changes in the dynamics of universities’ faculties; there are more part-time faculty and more faculty who are not on the tenure track. These factors, coupled with the publishing data, point to activities that all academic librarians should be aware of.

scholarly journals Creating relationship continuity across projects in the construction industry

IMP Journal ◽  
2017 ◽  
Vol 11 (2) ◽  
pp. 207-229 ◽  
Author(s):  
Malena Ingemansson Havenvid ◽  
Elsebeth Holmen ◽  
Åse Linné ◽  
Ann-Charlott Pedersen
Keyword(s):  
Construction Industry ◽  
Empirical Studies ◽  
Mutual Orientation ◽  
Content Type ◽  
Construction Firms ◽  
Relationship Continuity ◽  
Time Period ◽  
Strategy Types ◽  
The Relationship ◽  
Over Time

Purpose The purpose of this paper is to investigate the relationship continuity across projects among actors in the construction industry, and to discuss why and how such continuity takes place. Design/methodology/approach The authors draw on the results from four in-depth case studies illustrating different strategies for pursuing relationship continuity. The results are analysed and discussed in light of the oft-mentioned strategies suggested by Mintzberg (1987): emergent, deliberate and deliberately emergent strategies. Furthermore, the ARA-model is used to discuss why the relationship continuity strategies are pursued, and which factors might enable and constrain the relationship continuity. Findings The main findings are twofold. First, the authors found that the strategy applied for pursuing relationship continuity may, in one-time period, contain one type of strategy or a mix of strategy types. Second, the type of strategy may evolve over time, from one type of strategy being more pronounced in one period, to other strategies being more pronounced in later periods. The strategies applied by construction firms and their counterparts can thus contain elements of emergent, deliberate and deliberately emergent strategies, in varying degrees over time. It is also shown that the strategies of the involved actors co-evolve as a result of interaction. Also, the main reasons for pursuing continuity appear to lie in the re-use and development of important resources and activities across projects to create efficiency and the possibility to develop mutual orientation, commitment and trust over time, and thus reduce uncertainty. Research limitations/implications Further empirical studies are needed to support the findings. For managers, the main implication is that relationship continuity can arise as part of an emerging interaction pattern between firms or as part of a planned strategy, but that elements of both might be needed to sustain it. Originality/value The authors combine Mintzberg’s strategy concepts with the ARA-model to bring new light to the widely debated issue of discontinuity and fragmentation in the construction industry.

scholarly journals Visualizing Belief in Meritocracy, 1930–2010

2018 ◽  
Vol 4 ◽  
pp. 237802311881180 ◽  
Author(s):  
Jonathan J. B. Mijs
Keyword(s):  
Survey Data ◽  
Representative Sample ◽  
Western World ◽  
Birth Cohorts ◽  
Popular Belief ◽  
Time Period ◽  
Level Data ◽  
Two Measures ◽  
Time Periods ◽  
Over Time

In this figure I describe the long trend in popular belief in meritocracy across the Western world between 1930 and 2010. Studying trends in attitudes is limited by the paucity of survey data that can be compared across countries and over time. Here, I show how to complement survey waves with cohort-level data. Repeated surveys draw on a representative sample of the population to describe the typical beliefs held by citizens in a given country and period. Leveraging the fact that citizens surveyed in a given year were born in different time-periods allows for a comparison of beliefs across birth cohorts. The latter overlaps with the former, but considerably extends the time period covered by the data. Taken together, the two measures give a “triangulated” longitudinal record of popular belief in meritocracy. I find that in most countries, popular belief in meritocracy is (much) stronger for more recent periods and cohorts.

scholarly journals Neglecting Decline: Remembered and Predicted Personal Development Diverge from Actual Longitudinal Change.

2019 ◽  
Author(s):  
Sarah Molouki ◽  
Daniel Bartels ◽  
Oleg Urminsky
Keyword(s):  
Longitudinal Study ◽  
Personal Development ◽  
Absolute Magnitude ◽  
Longitudinal Change ◽  
Personal Change ◽  
Future Change ◽  
Change Over Time ◽  
Time Period ◽  
One Year ◽  
Over Time

A one-year longitudinal study was conducted to investigate the accuracy of people’s assessmentsof their own personal change over time. We compared people’s predicted, actual, and recalledchange in their personality, values, and preferences over this time period. On average,participants underestimated the absolute magnitude of their personal change, yet simultaneouslyoverestimated their net improvement, in both prediction and recall. This effect was due to anasymmetry whereby people selectively neglected negative changes, especially prospectively.Although participants in our sample both improved and declined over the year, they were morelikely to remember past improvements than declines, and made nearly uniformly positivepredictions of future change. We discuss how the current findings reconcile researchdemonstrating expectations of personal improvement (e.g., Wilson & Ross, 2001; Kanten &Teigen, 2008) with other research that suggests people overpredict their personal stability(Quoidbach, Gilbert, & Wilson, 2013).

scholarly journals Geographic disparities and socio-demographic predictors of pertussis risk in Florida

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e11902
Author(s):  
Corinne B. Tandy ◽  
Agricola Odoi
Keyword(s):  
Resource Allocation ◽  
High Risk ◽  
Geographic Distribution ◽  
Temporal Changes ◽  
County Level ◽  
Spatial Clusters ◽  
Geographic Disparities ◽  
Demographic Predictors ◽  
Time Period ◽  
Over Time

Background Pertussis is a toxin-mediated respiratory illness caused by Bordetella pertussis that can result in severe complications and death, particularly in infants. Between 2008 and 2011, children less than 3 months old accounted for 83% of the pertussis deaths in the United States. Understanding the geographic disparities in the distribution of pertussis risk and identifying high risk geographic areas is necessary for guiding resource allocation and public health control strategies. Therefore, this study investigated geographic disparities and temporal changes in pertussis risk in Florida from 2010 to 2018. It also investigated socioeconomic and demographic predictors of the identified disparities. Methods Pertussis data covering the time period 2010–2018 were obtained from Florida HealthCHARTS web interface. Spatial patterns and temporal changes in geographic distribution of pertussis risk were assessed using county-level choropleth maps for the time periods 2010–2012, 2013–2015, 2016–2018 and 2010–2018. Tango’s flexible spatial scan statistics were used to identify high-risk spatial clusters which were displayed in maps. Ordinary least squares (OLS) regression was used to identify significant predictors of county-level risk. Residuals of the OLS model were assessed for model assumptions including spatial autocorrelation. Results County-level pertussis risk varied from 0 to 116.31 cases per 100,000 people during the study period. A total of 11 significant (p < 0.05) spatial clusters were identified with risk ratios ranging from 1.5 to 5.8. Geographic distribution remained relatively consistent over time with areas of high risk persisting in the western panhandle, northeastern coast, and along the western coast. Although county level pertussis risks generally increased from 2010–2012 to 2013–2015, risk tended to be lower during the 2016–2018 time period. Significant predictors of county-level pertussis risk were rurality, percentage of females, and median income. Counties with high pertussis risk tended to be rural (p = 0.021), those with high median incomes (p = 0.039), and those with high percentages of females (p < 0.001). Conclusion There is evidence that geographic disparities exist and have persisted over time in Florida. This study highlights the application and importance of Geographic Information Systems (GIS) technology and spatial statistical/epidemiological tools in identifying areas of highest disease risk so as to guide resource allocation to reduce health disparities and improve health for all.

Part I Rationales for State Aid Rules, 2 Evolution of Aid in the EU: Classifying Different Types of Countries, and the Financial and Economic Crisis

2016 ◽  
Author(s):  
Kreuschitz Viktor ◽  
Nehl Hanns Peter
Keyword(s):  
Economic Crisis ◽  
Aggregate Data ◽  
European Market ◽  
Member States ◽  
Eu Member States ◽  
Time Period ◽  
Single European Market ◽  
Similarities And Differences ◽  
Over Time ◽  
The Eu

This chapter examines the evolution of (non-crisis) aid in the EU-27 since 1992, which serves as a basis to assess the similarities and differences between the practices of granting aid in EU Member States. Aggregate data for the EU-27 as a whole suggests that Member States have given a smaller percentage of their GDP as aid over time, which might be regarded as reflective of the view that they are accepting the need for its reduction and its control in the single European market. While declining in the first half of the 1990s, aid levels peaked in 1997, only to be reduced by 1999. This can be explained based on the new regulations that were pursued during the time period, which resulted in broader definitions by the Commission and tighter control.

Growth and Management of Repaired Complete Tracheal Rings after Slide Tracheoplasty

2019 ◽  
Vol 161 (1) ◽  
pp. 164-170 ◽  
Author(s):  
Lyndy J. Wilcox ◽  
Claudia Schweiger ◽  
Catherine K. Hart ◽  
Alessandro de Alarcon ◽  
Nithin S. Peddireddy ◽  
...  
Keyword(s):  
Medical Center ◽  
Academic Medical Center ◽  
Balloon Dilation ◽  
Case Series ◽  
Slide Tracheoplasty ◽  
Time Period ◽  
Academic Medical ◽  
Operative Notes ◽  
Over Time

ObjectiveThis study documents the growth and course of repaired complete tracheal rings over time after slide tracheoplasty.Study DesignCase series with review.SettingTertiary pediatric academic medical center.Subjects/MethodsMedical records of pediatric patients with confirmed tracheal rings on bronchoscopy who underwent slide tracheoplasty between January 2001 and December 2015 were reviewed. Patients who had operative notes documenting tracheal sizing over time were included. Exclusion criteria included tracheal stenosis not caused by complete tracheal rings, surgical repair prior to presentation at our institution, or lack of adequate sizing information. The postoperative follow-up was examined and airway growth over time documented.ResultsOf 197 slide tracheoplasties performed during the study time period, 139 were for complete tracheal rings, and 40 of those children met inclusion criteria. The median age at time of surgery was 7 months, and the median initial airway size was 3.9 mm (n = 34). The median growth postoperatively was 1.9 mm over a median follow-up period of 57 months (0.42 mm/year), which is similar to growth rates of unrepaired complete tracheal rings ( P = .53). Children underwent a median of 10 postoperative endoscopies, with time between endoscopies increasing further out from surgery. The most commonly performed adjunctive procedure was balloon dilation.ConclusionsThis is the first study documenting continued growth of repaired complete tracheal rings after slide tracheoplasty. Postoperative endoscopic surveillance ensures adequate growth. Intervals between airway endoscopies can be increased as the child gets older, as the airway increases in size, and as long as symptoms are minimal.

Memory and its Materiality: The Case of Early Iron Age Khirbet Qeiyafa and Jerusalem

2015 ◽  
Vol 127 (1) ◽  
Author(s):  
Daniel D. Pioske
Keyword(s):  
Material Culture ◽  
Iron Age ◽  
Hebrew Bible ◽  
Early Iron Age ◽  
Time Period ◽  
Ancient Israel ◽  
Over Time

In den wenigen Jahren seitdem Ausgrabungen in Khirbet Qeiyafa durchgeführt wurden, haben sich schon einige wichtige Studien mit seiner beeindruckenden Hinterlassenschaft aus der frühen Eisenzeit beschäftigt. Was bislang unberücksichtigt blieb, sind die Folgerungen der Befunde für die Schriftkultur, die für das Bild dieser Periode in der Hebräischen Bibel verantwortlich ist. Die Absicht dieser Studie besteht darin, das literarische Schicksal von Khirbet Qeiyafa mit dem des frühen und späten eisenzeitlichen Jerusalem zu vergleichen und zu ermitteln, was das Nichtvorkommen bzw. Vorkommen dieser Standorte in der Hebräischen Bibel über die Quellen der biblischen Verfasser aussagt, über die sie im 11. und 10. Jh. v. Chr. verfügten. Zugleich wird gefragt, welchen Beitrag Ort und Erinnerung bei der Überlieferung dieser Geschichten im antiken Israel und Juda hatten.In the few short years since excavations were first carried out at Khirbet Qeiyafa a number of important studies have been devoted to its impressive early Iron Age remains. Yet what has not been pursued within these discussions are the implications of the settlement’s material culture for our understanding of the scribal cultures responsible for the portrayal of this time period in the Hebrew Bible. In comparing the literary fate of Khirbet Qeiyafa with that of the contemporaneous site of late Iron I/early Iron IIA Jerusalem, the intent of this study is to examine what the absence and presence of these two sites in the Hebrew Bible indicates about the sources biblical scribes possessed about the 11th–10th centuries BCE, and how place and memory contributed to the transmission of these stories over time in ancient Israel and Judah.Dans les quelques années qui ont suivi les fouilles à Khirbet Qeiyafa, un bon nombre d’études conséquentes ont été consacrées à ses impressionnants vestiges du début de l’âge de Fer. Cependant, ce qui n’a pas été développé dans ces discussions, ce sont les implications de la culture matérielle de ce site pour notre compréhension milieux de scribes responsables de la description de cette période dans la Bible hébraïque. En comparant le destin littéraire de Khirbet Qeiyafa avec celui de Jérusalem, site contemporain de la fin du Fer I et du début du Fer IIA, cette étude cherche à examiner ce que la présence et l’absence de ces deux sites dans la Bible hébraïque indiquent au sujet des sources que les scribes bibliques possédaient sur les 11–10

scholarly journals “Would You Be My Friend?”: Friendship Selection and Contagion Processes of Early Adolescents Who Experience Victimization

2019 ◽  
Vol 39 (9) ◽  
pp. 1286-1310 ◽  
Author(s):  
Christian Berger ◽  
Mariola Claudia Gremmen ◽  
Diego Palacios ◽  
Eduardo Franco
Keyword(s):  
Peer Relations ◽  
Early Adolescents ◽  
Negative Consequences ◽  
Network Analyses ◽  
Time Period ◽  
Prosocial Peers ◽  
Social Network Analyses ◽  
Over Time ◽  
Friendship Selection

Victimization in early adolescence can have severe negative consequences later in life. Friendships are especially important in this time period. The present study investigated friendship selection and influence (contagion) processes with regard to victimization, as well as prosocial and aggressive characteristics of victims’ friends. Using social network analyses (RSiena), we longitudinally analyzed data of five fourth-grade classrooms, including 185 students (56.8% girls; [Formula: see text] age at Time 1 = 10 years old). Results showed that early adolescents who experience peer victimization were not likely to select peers with similar levels of victimization as friends but selected prosocial peers as friends. Moreover, friends did not become more similar over time in their victimization levels. Prosocial students selected similar peers as friends. The discussion highlights the relevance of fostering positive peer relations for targeting victimization and discusses the defending role of friends in victimization situations.

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