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At least 163 records · Page 9Linked to original sources
PubMed1985

Effect of central sympathectomy on gastric and small intestinal myoelectric activity and plasma motilin concentrations in the dog.

Using a canine model, we studied fed and fasting gastric and small intestinal myoelectric activity and plasma motilin concentrations before and after transection of the spinal cord between the second and third thoracic segments. In sham-operated dogs, migrating complexes returned to normal by the second day after operation. Immediately after spinal cord transection, migrating complexes cycled in jejunum and ileum but not in the stomach and duodenum. After 11 and 15 days, migrating complexes returned to the duodenum and stomach, respectively. Plasma motilin concentrations did not cycle in animals without duodenal migrating complexes but returned to a normal cyclical pattern when duodenal migrating complexes returned. Feeding interrupted migrating complexes after cord transection and sham operation. The data observed in animals after 15 days suggest that myoelectric activity in fasted dogs and conversion of the fasted to the fed state of myoelectric activity are not under the control of supraspinal, sympathetic pathways.

Animals↗
PubMed1997

Migration between home country and diaspora: an economic analysis.

"This paper investigates the distribution of a population group between a home country and diaspora, given sequential decision-making regarding migration at the individual level. The home country is attractive to the members of the group, yet their presence there requires a fixed amount of public spending (e.g., on defense). The per-capita tax burden depends then on the size of the domestic population, reflecting a case of ¿fiscal externality'. This results in an inefficient distribution of the group between the home country and the diaspora. Encouraging immigration to the home country is an interest not only of those individuals who are currently in the home country but also of those residing in the diaspora. However, only when the burden of public spending in the home country is large enough do the latter volunteer to bear part of it. Even then, in general, this part is smaller than socially optimal."

Behavior↗
PubMed1989

The impact of circular migration on a village economy.

The author examines the economy of a rural village in Indonesia in which a high proportion of households rely on remittances from urban informal sector earnings. Household income and per capita income are analyzed according to whether or not households have at least one temporary migrant, and by the sex and age of the household head. Findings indicate that "remittances from short-term circular migration push many households into the middle and upper income ranges. However, the wealthiest households continue to rely on traditional high earning activities and do not depend on remittances. The poorest households are scattered among those who rely on remittances and those still totally dependent upon traditional low earning village activities, regardless of the sex and age of the household head."

Age Factors↗
PubMed1990

Urban ties of rural Thais.

This article analyzes interpersonal linkages between villagers and urban dwellers and the effect on circular migration in Thailand. "Using data from Northeast Thailand, it examines the prevalence of urban social contacts, selectivities involved in such linkages, the characteristics of the urban contacts themselves, the salience of the interpersonal relationships, and the potential for the urban contact to act as a sponsor for the villagers. Furthermore, using a prospective research design, the impact of social contacts on subsequent rural-urban mobility of villagers is examined." A distinction is made between Bangkok and Northeastern Thai urban centers in order to illustrate some of the obstacles to the decentralized urbanization program in Thailand.

Asia↗
PubMed1988

Determinants of internal migration in Israel: expected returns and risks.

"A multinomial logit model of place-to-place migration focusing on economic, geographic and demographic factors is applied to empirical data on inter-regional migration in Israel in 1980. It explains 75% of the (cross-sectional) variance in the data. The results presented in this paper depart from previous empirical work due to its industrialized context and its focus on risk aversion as a determinant of the migration decision. The results support the Harris-Todaro (1970) hypothesis, and indicate that regional similarities in the structure of industrial employment promote migration."

Asia↗
PubMed1996

Emigration, return, immigration: a review and evaluation of Greece's postwar experience of international migration.

"This paper offers a review and evaluation of the Greek experience of international migration.... The analysis is based partly on available published data, and partly on qualitative appraisals. Three major international migration phases are analysed--emigration, return migration and immigration--and the main socio-economic and cultural effects of these migration trends are discussed. The paper pays particular attention to the recent mass immigration movements, noting their heterogeneity...and describing their impact on the Greek labour market. The article concludes with some comments on the difficulties of formulating a Greek migration policy in the light of the country's location, open borders and internationalized economy."

Culture↗
PubMed1987

International migration under incomplete information.

"We present a model for deriving optimal sequential migration decisions under incomplete information. As a main characteristic of the model, the decision maker can rationally learn about pecuniary and non-pecuniary net return on migration in different countries by migrating into these countries. Furthermore it is shown that the optimal migration policy can be characterized by a 'simple' procedure, called 'Gittins-index policy'. In the context of our sequential migration model we find more satisfying explanations for some relevant empirical observations (e.g. remigration) than...would be possible within the traditional deterministic approach." (SUMMARY IN FRE AND GER)

Behavior↗
PubMed1988

Caribbean skilled international migration and the transnational household.

"This paper briefly outlines the occupational profile of Caribbean migrants and raises questions concerning the extent to which migrant outflow represents absolute loss.... It is argued that circulation is not confined to commuter-type mobility but in the Caribbean it is also a feature of long-stay migration and the establishment of what are effectively transnational households. Though the characteristics and spatial behaviour of the household vary with the specific migration type, the transnational household provides a more appropriate model for analysing Caribbean migration and its implications than does the model based on migration as displacement."

Americas↗
PubMed1996

Outmigration of U.S. immigrants.

"A methodology is devised for the empirical analysis of the determinants of outmigration of immigrants in a population. Empirical studies in this area have been hindered by a lack of longitudinal data on the characteristics of the immigrants. This problem is tackled by making use of cross-sectional data at two points in time. It is applied to the study of male immigrants in the United States. It is found that education is positively related to the rate of outmigration for immigrants from Canada, Asia and the pooled sample of immigrants. This finding suggests that the cross-sectional estimates of the growth in earnings of immigrants in the United States are underestimated for these groups of immigrants."

Americas↗