scholarly journals Pathogenicity of the hymenolepidid cestode Microsomacanthus hopkinsi in its intermediate host, Hyalella azteca: implications for transmission, host fitness, and host populations

2006 ◽  
Vol 84 (1) ◽  
pp. 32-41 ◽  
Author(s):  
T Kokkotis ◽  
J D McLaughlin
Keyword(s):  
Intermediate Host ◽  
Hyalella Azteca ◽  
Experimental Period ◽  
Host Population ◽  
Intermediate Hosts ◽  
Short Term ◽  
Host Fitness ◽  
Negative Effect ◽  
Larval Parasites

Infection by larval parasites can have severe consequences on intermediate hosts that affect transmission, fecundity and fitness of the host, and host population structure. This study examines the pathogenic effects of cysticercoid larvae of the hymenolepidid cestode Microsomacanthus hopkinsi (Schiller, 1951) on its amphipod intermediate host, Hyalella azteca Saussure, 1858. There was a significant, positive relationship between oncosphere consumption, cysticercoid burden, and age in short-term experiments in which groups of H. azteca were exposed individually to single egg packets of M. hopkinsi during instars 1, 2, 3, 4, 6, 8, and 9; however, there was no correlation between oncosphere consumption and the intensity of infection in the amphipod hosts within each instar. The mean number of moults over a 14 day experimental period was significantly less in infected amphipods than in their respective controls. In short-term experiments, the greatest mortality appeared to be limited to amphipods exposed during the earliest instars; little mortality was observed in amphipods exposed during instar 4 or later. Long-term experiments revealed a significant negative effect of infection on the overall life span of both male and female H. azteca exposed individually to a single egg packet during instar 4. Of 72 females infected during instar 4 and provided with mates during instar 6, only 1 and 4 produced broods in instars 8 and 9, respectively, compared with 58 and 57 of 72 control females. Broods produced by infected females were significantly smaller than those of control females. Infected individuals were less likely to mate successfully. The results are discussed in terms of their consequences for transmission, host fitness, and potential effects on host populations.

Labor lawsuits and debt maturity

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Omer Unsal
Keyword(s):  
Chief Executive ◽  
Debt Maturity ◽  
Employee Relations ◽  
Short Term ◽  
Content Type ◽  
Negative Effect ◽  
Debt Market ◽  
Legal Fees

Purpose This paper aims to investigate how firms’ relationships with employees define their debt maturity. The authors empirically test the role of employee litigations in influencing firms’ choice of short-term versus long-term debt. The authors study employee relations by analyzing the importance of the workplace environment on capital structure. Design/methodology/approach The author’s test hypotheses using a sample of US publicly traded firms between 2000 and 2017, including 3,056 unique firms with 4,256 unique chief executive officer, adopting the fixed effect panel model. Findings The authors document that employee litigations have a significant negative effect on the use of short-term debt and a significant positive affect on long-term debt. Employee litigations, along with legal fees, outcomes and charging parties, matter the most in explaining debt maturity. In addition, frequently sued firms abandon the short-term debt market and use less shareholders’ equity to finance their operations while relying more on the longer debt market. Originality/value To the best of the authors’ knowledge, this is the first study to examine the role of employee mistreatment in debt maturity choice. The study extends the lawsuit and finance literature by examining unique, hand-collected data sets of employee lawsuits, allegations, violations, settlements, charging parties, case outcomes and case durations.

scholarly journals PENGARUH GLOBALISASI KEPADATAN PENDUDUK DAN PERTUMBUHAN EKONOMI TERHADAP DEGRADASI LINGKUNGAN DI INDONESIA

2020 ◽  
Vol 2 (4) ◽  
Author(s):  
Safriwan Safriwan ◽  
Idris Idris
Keyword(s):  
Population Density ◽  
Environmental Degradation ◽  
Research Result ◽  
Short Term ◽  
Method Error ◽  
Negative Effect ◽  
Economic Institute ◽  
Carbon Project ◽  
Positive Effect

Abstract : The study describes the effects on globalization population density andeconomic growth on environmental degradation in Indonesia. This research uses a timeseries data from year 1971 - 2017, with method Error Correction Model (ECM). Datasources from Global Carbon Project, KOF Swiss Economic Institute, and WorldBank. Research result explain that (1) Globalization in long term has a insignificantpositive effect on environmental degradation in Indonesia, but short term globalizationhas a insignificant negative effect on environmental degradation in Indonesia (2)Population density in long term has a significant positive , and short term has ainsignificant positive effect on environmental degradation in Indonesia (3) Economicgrowth in long and short term has a significant positive effect on environmentaldegradation in Indonesia.Keywords : Environmental Degradation, Globalization Population Density AndEconomic Growth.

Economic Complexity and Trade Diversification in the Western Hemisphere Between 1962 and 2017

2021 ◽  
pp. 115-147
Author(s):  
Jorge Mauricio Falcón Gómez ◽  
Fernando Martín Mayoral
Keyword(s):  
Financial Markets ◽  
Transaction Costs ◽  
Trade Openness ◽  
Terms Of Trade ◽  
Western Hemisphere ◽  
Short Term ◽  
Economic Complexity ◽  
Comparative Advantages ◽  
Negative Effect

Trade diversification patterns help explain the level of utilization of trade opportunities by countries, mainly the least developed. Empirical analyses show an inverse U relationship between trade diversification and level of development. Trade diversification measures used do not take into account differences in complexity of exports, and complexity indices only consider products with comparative advantages. This study seeks to cover both gaps by analyzing the differences in the determinants of trade diversification, considering the complexity of products exported by 19 Western Hemisphere countries from 1962 to 2017. The results show that after controlling for economic complexity, the inverted U relationship disappears. Development of financial markets positively affects the complexity of trade diversification in the long term, while the terms of trade that have a negative effect on trade diversification does not affect the complexity-corrected indices. In the short term, transaction costs and trade openness appear to have a significant effect.

Intestinal parasites of the Arctic fox in relation to the abundance and distribution of intermediate hosts

Parasitology ◽  
2009 ◽  
Vol 137 (1) ◽  
pp. 149-157 ◽  
Author(s):  
A. STIEN ◽  
L. VOUTILAINEN ◽  
V. HAUKISALMI ◽  
E. FUGLEI ◽  
T. MØRK ◽  
...  
Keyword(s):  
Intermediate Host ◽  
Intestinal Parasites ◽  
Parasite Community ◽  
Host Population ◽  
The Arctic ◽  
Arctic Fox ◽  
Vole Population ◽  
Intermediate Hosts ◽  
Svalbard Archipelago ◽  
Abundance And Distribution

SUMMARYThe intestinal parasite community of Arctic foxes (Vulpes lagopus) on the Svalbard archipelago in the High Arctic was investigated in relation to the abundance and distribution of intermediate hosts. Five species of cestodes (Echinococcus multilocularis, Taenia crassiceps, Taenia polyacantha, Taenia krabbei and Diphyllobothrium sp.), ascaridoid nematodes and one unidentified acanthocephalan species were found. The cestodes E. multilocularis, T. crassiceps and T. polyacantha all showed a decreasing prevalence in the fox population with increasing distance from their spatially restricted intermediate host population of sibling voles (Microtus levis). In addition, the prevalence of E. multilocularis in a sample from the vole population was directly related to the local vole abundance. The cestode T. krabbei uses reindeer as intermediate host, and its prevalence in female foxes was positively related to the density of reindeer (Rangifer tarandus platyrhyncus). Finally, the prevalence of the ascaridoid nematodes also decreased with increasing distance from the vole population, a finding that is consistent with the idea that voles are involved in transmission, most likely as paratenic hosts. The prevalence of the remaining species (Diphyllobothrium sp. and an unidentified acanthocephalan) was very low. We conclude that the distribution and abundance of intermediate host structure the gastrointestinal parasite community of the Arctic fox on the Svalbard archipelago.

scholarly journals Effects of temperature on the oncospheres of the cestode Microsomacanthus hopkinsi and its implication for their over-winter survival

1992 ◽  
Vol 70 (5) ◽  
pp. 935-940 ◽  
Author(s):  
John Lee ◽  
Wilfred Pilgrim ◽  
J. D. McLaughlin ◽  
M. D. B. Burt
Keyword(s):  
Intermediate Host ◽  
Survival Time ◽  
Host Population ◽  
Potential Significance ◽  
Northern Limit ◽  
Natural Conditions ◽  
Short Term ◽  
Inactive Period ◽  
Effects Of Temperature ◽  
Time Of Feeding

In an attempt to determine whether hymenolepidid oncospheres may overwinter and contribute to the pool of cysticercoids in the intermediate host population the following spring, we studied the survival of the oncospheres of the cestode Microsomacanthus hopkinsi following storage at 7 and 20 °C, following short-term freezing under laboratory conditions, and after overwintering (October–May) under natural conditions at depths of 0.5, 1, and 1.5 m in a local lake. Viability was tested by feeding the oncospheres to laboratory-reared amphipods (Hyalella azteca). The percentage of surviving amphipods that became infected following exposure to oncospheres stored at 7 °C declined steadily from 96% following 4 weeks storage to 43% after 24 weeks. Only 3% (2 of 60) were infected following exposure to oncospheres stored for 28 weeks. Oncospheres held overwinter under natural conditions failed to produce infections. These were slightly older (29 weeks) than the oldest oncospheres maintained at 7 °C in the laboratory, at the time of feeding to the amphipods. It appears that 28 weeks approaches the maximum survival time for the oncospheres of this species. Oncospheres subjected to short-term freezing also failed to produce infections when fed to amphipods. Oncospheres survived in sufficient numbers for up to 24 weeks to be of potential significance in the formation of infective pools in amphipods in the spring. However, there is a northern limit beyond which the inactive period of the amphipod host is too long for the oncospheres to bridge. Under these circumstances, they are of no consequence in the formation of the infective pool. Only 5% (3 of 60) of the amphipods exposed to oncospheres stored at 20 °C for 4 weeks became infected. Foci established in warmer conditions, as expected, are infective for much shorter periods.

Effect of Goal Proximity and Goal Specificity on Muscular Endurance Performance: A Replication and Extension

1991 ◽  
Vol 13 (2) ◽  
pp. 174-187 ◽  
Author(s):  
Gershon Tenenbaum ◽  
Saadia Pinchas ◽  
Gabi Elbaz ◽  
Michael Bar-Eli ◽  
Robert Weinberg
Keyword(s):  
High School Students ◽  
Endurance Performance ◽  
Experimental Period ◽  
Baseline Period ◽  
Short Term ◽  
School Students ◽  
Goal Specificity ◽  
And Performance ◽  
The Relationship

The purpose of the present investigation was to extend the literature on the relationship between goal specificity, goal proximity, and performance by using high school students and attempting to control for the effects of social comparison. Subjects (N=214) in Experiment 1 were randomly assigned to one of five goal-setting conditions: (a) short-term goals, (b) long-term goals, (c) short- plus long-term goals,(d) do-your-best goals, and (e) no goals. After a 3-week baseline period, subjects were tested once a week on the 3-minute sit-up over the course of the 10-week experimental period. Results indicated that the short- plus long-term group exhibited the greatest increase in performance although the short-term and long-term groups also displayed significant improvements. In Experiment 2, a short- plus long-term group was compared against a do-your-best group. Results again revealed a significant improvement in performance for the combination-goal group whereas the do-your-best group did not display any improvement.

scholarly journals PENGARUH VARIABEL MAKRO EKONOMI TERHADAP PERTUMBUHAN EKONOMI INDONESIA TAHUN 2015-2019

2021 ◽  
Vol 2 (2) ◽  
pp. 88-99
Author(s):  
Feby Kinanda
Keyword(s):  
Economic Growth ◽  
Exchange Rate ◽  
Unemployment Rate ◽  
Trade Balance ◽  
Inflation Rate ◽  
Short Term ◽  
Negative Effect ◽  
The Exchange Rate ◽  
Positive Effect

This study aims to analyze the effect of macroeconomic variables including the open unemployment rate, trade balance, inflation rate and the rupiah exchange rate against the dollar on Indonesian economic growth by using the ECM error correction model approach to see the long-term and short-term relationships that influence macro variables on economic growth. , in the long term the open unemployment rate variable, the trade balance, the inflation rate have a negative effect while the exchange rate has a positive effect, while in the short term the open unemployment rate, the inflation rate and the exchange rate have a negative effect while the trade balance has a positive effect.   Keywords: Economic Growth, Open Unemployment Rate, Trade Balance, Inflation, Exchange Rate

scholarly journals ANALYSIS OF ECONOMIC ON ENVIRONMENTAL DEGRADATION IN INDONESIA

2021 ◽  
pp. 251
Author(s):  
Rahardyan Haris Yuswinarto ◽  
Edy Yusuf Agung Gunanto
Keyword(s):  
Economic Growth ◽  
Population Growth ◽  
Environmental Degradation ◽  
Short Term ◽  
Gas Emissions ◽  
Co2 Gas ◽  
Negative Effect ◽  
Short And Long Term ◽  
Dynamic Time

Environmental degradation occurs is influenced by economic growth and the means of transportation that support it, besides that, the population size also affects the occurrence of environmental degradation. This study aims to determine the effect of economic growth, population growth and total of transportation on environmental degradation in short and long term. This research uses dynamic time series autoregressive distribution lag method. The results showed that the gross domestic product (GDP) variable had a significant positive effect in increasing CO2 gas emissions both in the short and long term. The variable amount of transportation has a positive and insignificant effect on the increase in CO2 gas emissions in the short term and has a negative effect in the long term. Meanwhile, population growth variable has a positive and significant effect in the short term and negative and significant in the long term.

scholarly journals Struktur Pendanaan dan Profitabilitas: Studi pada Perusahaan Non-Keuangan yang Listing di Bursa Efek Indonesia

2019 ◽  
Vol 1 (1) ◽  
pp. 55-66
Author(s):  
Irene Rini Demi Pangestuti ◽  
Dinar Nur Septiyanto
Keyword(s):  
Capital Structure ◽  
Random Sampling ◽  
Stock Exchange ◽  
Sampling Technique ◽  
Short Term ◽  
Return On Assets ◽  
Negative Effect ◽  
Equity Ratio ◽  
Positive Effect

Purpose- The study was conducted to examine the effect of capital structure on profitability. Variables of the capital structure are Long-term Debt to total assets (LTD), Short-term Debt to total assets (STD) and Debt to Equity Ratio (DER) while profitability is proxied by Return on Assets (ROA. Research is conducted on all Non-Financial companies listed on the Indonesia Stock Exchange (IDX) in the period 2014-2016. Methods- Use the Purposive Random Sampling technique to take samples. Samples taken from Bloomberg. The sample used amounted to 175 companies using multiple regression analysis SPSS program assistance. Finding- The results of the study note that LTD and STD have a significant negative effect on ROA. DER has not a significant positive effect on ROA.

scholarly journals Pengaruh Harga Emas Dunia, Harga Minyak Mentah Dunia dan Indeks Produksi Industri Terhadap Indeks Saham di Jakarta Islamic Index (JII) Dalam Jangka Panjang dan Jangka Pendek (Periode Januari 2005-Desember 2015)

2017 ◽  
Vol 4 (7) ◽  
pp. 515
Author(s):  
Dwi Purnamasari ◽  
Raditya Sukmana
Keyword(s):  
Crude Oil ◽  
Industrial Production ◽  
Secondary Data ◽  
Stock Index ◽  
Short Term ◽  
Long Run ◽  
The World ◽  
Negative Effect ◽  
Positive Effect

This research aims to know the influence of long-term and short-term world gold price, the price of crude oil to the world, and the index of industrial production against the stock index at the Jakarta Islamic Index (JII) during the period January to December 2015-2015. The object of this research is the stock index at the Jakarta Islamic Index (JII). Types of data used are secondary data. This research method using technical analysis with quantitative method of Error Correction Mechanism (ECM). The results showed that significant influence world gold prices in the long term and the short term against a stock index of JII. While the price of crude oil the world significant negative effect on the long run, and a significant positive effect on the short term. The index of industrial production turned out to be only a significant effect in the long term, but not in the short term.

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