OALib Journal期刊

ISSN: 2333-9721




2020 ( 42 )

2019 ( 97 )

2018 ( 100 )

2017 ( 116 )


匹配條件: “David Pimentel” ,找到相關結果約54702條。
Corn and Cellulosic Ethanol Cause Major Problems
David Pimentel,Marcia Pimentel
Energies , 2008, DOI: 10.3390/en1010035
Abstract: Crops for biofuels squanders cropland, water, and energy resources vital for food production needed for people.
Energy Inputs in Food Crop Production in Developing and Developed Nations
David Pimentel
Energies , 2009, DOI: 10.3390/en20100001
Abstract: Detailed energy outputs and inputs were assessed for the following crops, cultured in the U.S. and developing countries: corn, wheat, rice, soy, potato, cassava, tomato, citrus and apple. In addition, the labor input for each crop was analyzed.
Genetically Modified Crops and the Agroecosystem: Comments on "Genetically Modified Crops: Risks and Promise" by Gordon Conway
David Pimentel
Ecology and Society , 2000,
Silent Spring, the 50th anniversary of Rachel Carson’s book
Pimentel David
BMC Ecology , 2012, DOI: 10.1186/ 1472-6785-12-20
Abstract: Editorial David Pimentel is a professor of ecology and agricultural sciences at Cornell University, Ithaca, NY 14853–0901. His Ph.D. is from Cornell University and had postdoctoral research at the University of Chicago, MIT, and fellowship at Oxford University (England). He was awarded a distinguished honorary degree from the University of Massachusetts. His research spans the fields of energy, population ecology, biological pest control, pesticides, sustainable agriculture, land and water conservation, livestock, and environmental policy. Pimentel has published more than 700 scientific papers and 37 books and has served on many national and government committees including the National Academy of Sciences; President’s Science Advisory Council; U.S Department of Agriculture; U.S. Department of Energy; U.S. Department of Health, Education and Welfare; Office of Technology Assessment of the U.S. Congress; and the U.S. State Department. He is currently Editorial Advisor for BMC Ecology. In this article, he reflects on 50 years since the publication of Rachel Carson’s influential book, Silent Spring.
Soil Erosion Threatens Food Production
David Pimentel,Michael Burgess
Agriculture , 2013, DOI: 10.3390/agriculture3030443
Abstract: Since humans worldwide obtain more than 99.7% of their food (calories) from the land and less than 0.3% from the oceans and aquatic ecosystems, preserving cropland and maintaining soil fertility should be of the highest importance to human welfare. Soil erosion is one of the most serious threats facing world food production. Each year about 10 million ha of cropland are lost due to soil erosion, thus reducing the cropland available for world food production. The loss of cropland is a serious problem because the World Health Organization and the Food and Agricultural Organization report that two-thirds of the world population is malnourished. Overall, soil is being lost from agricultural areas 10 to 40 times faster than the rate of soil formation imperiling humanity’s food security.
Analysis of Perceptions and Prenatal Medical Records of Black Teens Girls in a S?o Paulo Hospital  [PDF]
Adelma Pimentel
Psychology (PSYCH) , 2014, DOI: 10.4236/psych.2014.519224
Abstract: This paper studied pre-natal black teenager girls in a public hospital in Santos, state of Sao Paulo, Brazil. We discussed the strategies of the professional staff members, and the conceptions of reproductive and sexual health for teenagers. We noticed, among other things that medical records had not been completely filled, the item color had subdivisions, total lack of familiarity with public policies directed toward the Black population, and some discrete signs of institutional racism. We considered that specific attention to black teens was not given during work as part of a public policy; the lack of medical prevention leads to a referral hospital that does not articulate, on triage, the integral health policy for the Black population, the institutional care and equity.
Seeking to Understand the Reasons for Different Energy Return on Investment (EROI) Estimates for Biofuels
Charles A.S. Hall,Bruce E. Dale,David Pimentel
Sustainability , 2011, DOI: 10.3390/su3122413
Abstract: The authors of this paper have been involved in contentious discussion of the EROI of biomass-based ethanol. This contention has undermined, in the minds of some, the utility of EROI for assessing fuels. This paper seeks to understand the reasons for the divergent results.
Variante anatómica: Tronco Carotídeo Común o Truncus Bicaroticus
Rodríguez Palomo,David; Brenes Pimentel,Adrián;
Medicina Legal de Costa Rica , 2011,
Abstract: this paper describes the presence of anatomical variation called common carotid trunk or truncus bicaroticus in one case incidental dissection at the school of medicine of universidad de ciencias médicas, presented in this variant less than 0.2% of the population. it also reviews the issue and its clinical importance.
Variante anatómica: Tronco Carotídeo Común o Truncus Bicaroticus
David Rodríguez Palomo,Adrián Brenes Pimentel
Medicina Legal de Costa Rica , 2011,
Abstract: Este trabajo describe la presencia de la variante anatómica denominada tronco carotídeo común o truncus bicaroticus en un caso incidental de disección en la Escuela de Medicina de la Universidad de Ciencias Médicas, dicha variante se presenta en menos de un 0.2% de la población. Así mismo se revisa el tema y su importancia clínica. This paper describes the presence of anatomical variation called common carotid trunk or truncus bicaroticus in one case incidental dissection at the School of Medicine of Universidad de Ciencias Médicas, presented in this Variant less than 0.2% of the population. It also reviews the issue and its clinical importance.
Paleogeography and Sequence Stratigraphy in Dariyan Carbonate Reservoir, NE Shiraz  [PDF]
Amir Karimian Torghabeh, Nuno Pimentel
Open Journal of Geology (OJG) , 2016, DOI: 10.4236/ojg.2016.611101
Abstract: Zagros Basin is a very important hydrocarbon region in the Iran and World. One of the major reservoirs in this basin is the Lower Cretaceous Dariyan Formation. Based on petrographic studies, 9 microfacies were determined and interpreted as related to lagoon, barrier island and open marine environments. Facies associations show deposition in a carbonate ramp. Sequence stratigraphy studies show two sequences, each one with a transgressive system tract, marked by open marine microfacies, and then a retrogradational highstand, marked by barrier and lagoonal facies. Paleogeography and sequence stratigraphy studies of this formation and correlation of it with other sections may provide useful information about reservoir characterizations.

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