Explaining US Immigration 1971-1998

In this paper we develop and estimate a model to explain the level and source country composition of immigration to the United States since the early 1970s. The model incorporates ratios to the US of source country income and education, and demographic structure, as well as relative inequality as suggested by the Roy model applied to migrant selection. In addition we incorporate the 'friends and relatives effect' as reflected in the stock of previous immigrants and a variety of variables representing different dimensions of the immigration quotas set by policy. We estimate our immigration model on a panel of 81 source countries for the years 1971 to 1998. The results strongly support the influence of economic and demographic variables and geographic characteristics as well as policy variables. We use the results to shed light on the factors that influenced the composition of US immigration by source region. And we provide a further check on its plausibility by simulating the effects of the key changes in immigration policy since the late 1970s.

Where Do U.S. Immigrants Come From, and Why?

The United States has experienced rising immigration levels and changing source since the 1950s. The changes in source have been attributed to the 1965 Amendments to the Immigration Act that abolished country-quotas and replaced them with a system that emphasized family reunification. Some believed that the Amendments would not change the 'traditional' sources of US immigrants. Given this view, it seems all the more remarkable that the sources of immigration changed so dramatically. This paper isolates the economic and demographic fundamentals that determined immigration rates by source from 1971 to 1998 -- income, education, demographic composition and inequality. The paper also allows for persistence - big US foreign-born stocks implying a strong 'friends and neighbors' pull on current immigrant flows. Specific policy variables are included which are derived directly from the quotas allocated to different visa categories. Parameter estimates from the panel data are then used to implement counterfactual simulations that serve to isolate the effects of immigration policy as well as source-country economic and demographic conditions.

Explaining U.S. immigration, 1971-98

The authors develop and estimate a model explaining the level and country-source composition of United States immigration since the early 1970s. The model incorporates ratios of source country income, education, and demographic structure, as well as relative inequality. The authors'model also incorporates both network effects, as reflected in the stock of previous immigrants, and various controls for immigration quota policy. The model is estimated on a panel of 81 source countries for 1971-98. The results strongly support the influence of economic, demographic, and geographic variables as well as policy. The regression results are used to identify those factors that most influenced the changing composition of U.S. immigration by source.Health Monitoring&Evaluation,Public Health Promotion,Voluntary and Involuntary Resettlement,Human Migrations&Resettlements,Gender and Social Development,Health Monitoring&Evaluation,Voluntary and Involuntary Resettlement,Human Migrations&Resettlements,Gender and Social Development,Economic Theory&Research

What Explains Cross-Border Migration in Latin America?

What accounts for the differences in rates of emigration from Latin America compared with those from other sending regions such as Asia and Africa? Why do cross-border migration rates vary so much across Latin America? What explains those rates? This paper looks at evidence covering the period between the early 1970s and the late 1990s. It represents the start of a project seeking answers to these questions.

PRDM14 is expressed in germ cell tumors with constitutive overexpression altering human germline differentiation and proliferation.

Germ cell tumors (GCTs) are a heterogeneous group of tumors occurring in gonadal and extragonadal locations. GCTs are hypothesized to arise from primordial germ cells (PGCs), which fail to differentiate. One recently identified susceptibility loci for human GCT is PR (PRDI-BF1 and RIZ) domain proteins 14 (PRDM14). PRDM14 is expressed in early primate PGCs and is repressed as PGCs differentiate. To examine PRDM14 in human GCTs we profiled human GCT cell lines and patient samples and discovered that PRDM14 is expressed in embryonal carcinoma cell lines, embryonal carcinomas, seminomas, intracranial germinomas and yolk sac tumors, but is not expressed in teratomas. To model constitutive overexpression in human PGCs, we generated PGC-like cells (PGCLCs) from human pluripotent stem cells (PSCs) and discovered that elevated expression of PRDM14 does not block early PGC formation. Instead, we show that elevated PRDM14 in PGCLCs causes proliferation and differentiation defects in the germline

An Interview with Timothy J. Sullivan

If you know from whence we came, let\u27s just say from 1920, to where we are today, it\u27s an extraordinary story. -- Tim Sullivan. ------------------------------------ The interview of Timothy J. Sullivan, Dean Emeritus of William & Mary Law School and President Emeritus of the College of William & Mary in Virginia, occurred on Tuesday, March 28, 2023, from approximately 2:00 P.M. to 3:00 P.M. in the Media Center of Swem Library. The interview concerned Timothy Sullivan’s tenure at the law school, beginning with his time as a member of the faculty in the early 1970s and continuing to the conclusion of his time as dean of from 1985 to 1992.https://scholarship.law.wm.edu/oralhist_all/1000/thumbnail.jp

The Benefits of Breastfeeding: An introduction for Health Educators

Currently 16% of Americans breastfeed their children for at least 12 months as recommended by the AAP, which is well below the HP 2010 goal of 25%. Breastfed infants receive benefits that can improve their health throughout their lives. The benefits of breastfeeding for children include increased resistance to infectious diseases, such as gastroenteritis, respiratory tract infections, and ear infections. Breastfed children also display lower rates of chronic diseases including diabetes, obesity, asthma, and leukemia. The choice to breastfeed results in economic benefits from lower health care costs and from reduced spending on infant formula. The Healthy People 2010 targets are reviewed along with several studies of interventions to increase breastfeeding rates. Health educators must work to increase breastfeeding rates

Digestive state influences the heart rate hysteresis and rates of heat exchange in the varanid lizard Varanus rosenbergi

© The Company of Biologists LtdTo maximize the period where body temperature (Tb) exceeds ambient temperature (Ta), many reptiles have been reported to regulate heart rate (fH) and peripheral blood flow so that the rate of heat gain in a warming environment occurs more rapidly than the rate of heat loss in a cooling environment. It may be hypothesized that the rate of cooling, particularly at relatively cool Tbs, would be further reduced during postprandial periods when specific dynamic action (SDA) increases endogenous heat production (i.e. the heat increment of feeding). Furthermore, it may also be hypothesized that the increased perfusion of the gastrointestinal organs that occurs during digestion may limit peripheral blood flow and thus compromise the rate of heating. Finally, if the changes in fH are solely for the purpose of thermoregulation, there should be no associated changes in energy demand and, consequently, no hysteresis in the rate of oxygen consumption (O2). To test these hypotheses, seven individual Varanus rosenbergi were heated and cooled between 19°C and 35°C following at least 8 days fasting and then approximately 25 h after consumption of a meal (mean 10% of fasted body mass). For a given Tb between the range of 19-35°C, fH of fasting lizards was higher during heating than during cooling. Postprandial lizards also displayed a hysteresis in fH, although the magnitude was reduced in comparison with that of fasting lizards as a result of a higher fH during cooling in postprandial animals. Both for fasting and postprandial lizards, there was no hysteresis in O2 at any Tb throughout the range although, as a result of SDA, postprandial animals displayed a significantly higher O2 than fasting animals both during heating and during cooling at Tbs above 24°C. The values of fH during heating at a given Tb were the same for fasting and postprandial animals, which, in combination with a slower rate of heating in postprandial animals, suggests that a prioritization of blood flow to the gastrointestinal organs during digestion is occurring at the expense of higher rates of heating. Additionally, postprandial lizards took longer to cool at Tbs below 23°C, suggesting that the endogenous heat produced during digestion temporarily enhances thermoregulatory ability at lower temperatures, which would presumably assist V. rosenbergi during cooler periods in the natural environment by augmenting temperature-dependent physiological processes

NASA/DOE/DOD nuclear propulsion technology planning: Summary of FY 1991 interagency panel results

Interagency (NASA/DOE/DOD) technical panels worked in 1991 to evaluate critical nuclear propulsion issues, compare nuclear propulsion concepts for a manned Mars mission on a consistent basis, and to continue planning a technology development project for the Space Exploration Initiative (SEI). Panels were formed to address mission analysis, nuclear facilities, safety policy, nuclear fuels and materials, nuclear electric propulsion technology, and nuclear thermal propulsion technology. A summary of the results and recommendations of the panels is presented