Xem 1-20 trên 238 kết quả Human populations
  • In this chapter, students will be able to understand: How many people live in the world today? How many people live in poverty? What is the current rate of world population growth? What is the demographic constant used to calculate population doubling time? What percent of the worlds wealth is controlled by developed and developing countries respectively? What proportion of the human population lives in developing countries?

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  • Environmental science includes: definition, scope and important, natural resources, ecosystem, biodiversity and conservation, pollution and its factor, social issues, human population and environment, field trip, modern library, morden and effective teacher.

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Evolution of naturally occurring 5'non-coding region variants of Hepatitis C virus in human populations of the South American region

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Avian influenza A (H9N2): computational molecular analysis and phylogenetic characterization of viral surface proteins isolated between 1997 and 2009 from the human population

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  • Tham khảo tài liệu 'báo cáo hóa học: " evolution of naturally occurring 5'non-coding region variants of hepatitis c virus in human populations of the south american region"', luận văn - báo cáo phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Retrovirology cung cấp cho các bạn kiến thức về ngành y đề tài: Detection of a gammaretrovirus, XMRV, in the human population: Open questions and implications for xenotransplantation...

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  • Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Wertheim cung cấp cho các bạn kiến thức về ngành y đề tài: Panmixia postponed: ancestry-related assortative mating in contemporary human populations...

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  • Improvements in agriculture health and medicine have produced a dramatic rise in the human population This increase in population size leads to an increase in pollution and higher demand for the world’s resources. Humans are using up the earth’s resources, including fossil fuels.

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  • Research in tropical forestry is confronted with the task of finding strategies to alleviate pressure on remaining forests, and techniques to enhance forest regeneration and restore abandoned lands, using productive alternatives that can be attractive to local human populations. In addition, sustainable forestry in tropical countries must be supported by adequate policies to promote and maintain specific activities at local and regional scales.

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  • When it comes to advocating animal conservation, it is difficult to be convincing without becoming alarmist. The fact is, time is running out for many of the world’s animal species. Habitat loss, introduced species, overexploitation and pollution, all caused by human activities, combine with stochastic factors to place ever-increasing pressure on natural populations (Primack 2002).

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  • The epidemiology of infectious diseases is one of the great triumphs of applied ecology. In particular, the public health importance of parasites has lead to a large literature, exploring their impact on the population dynamics, population genetics and evolutionary biology of human populations. An important milestone was the Dahlem Conference on population biology of infectious diseases, held in 1981. The resulting book (Anderson and May 1982) lucidly summarised the contemporary state of parasite ecology and epidemiology.

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  • Publisher: RANDPublished Time: RANDPages: 100Countries in the Arab region are faced with the challenge of developing their populations’ skills and technical knowledge, or human capital, in order to compete in the 21st century global economy. The authors describe the education and labor market initiatives implemented or under way in four countries in the Arab region ......

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  • Table 62-8 Genetic Approaches for Identifying Disease Genes Method Indications Advantages and Limitations Linkage Studies Classical linkage analysis Analysis of Difficult to collect (parametric monogenic traits large informative pedigrees methods) Suitable for genome scan Difficult to obtain sufficient statistical power for complex traits Control not required population Useful for multifactorial disorders in isolated populations Allele-sharing Suitable for Difficult to collect methods (nonparametric identification methods) susceptibility genes of sufficient nu...

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  • Population Genetics In population genetics, the focus changes from alterations in an individual's genome to the distribution pattern of different genotypes in the population. In a case where there are only two alleles, A and a, the frequency of the genotypes will be p2 + 2pq + q2 = 1, with p2 corresponding to the frequency of AA, 2pq to the frequency of Aa, and q2 to aa. When the frequency of an allele is known, the frequency of the genotype can be calculated. Alternatively, one can determine an allele frequency, if the genotype frequency has been determined. Allele frequencies vary...

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  • DNA testing is performed by mutational analysis or linkage studies in individuals at risk for a genetic disorder known to be present in a family. Mass screening programs require tests of high sensitivity and specificity to be costeffective. Prerequisites for the success of genetic screening programs include the following: that the disorder is potentially serious; that it can be influenced at a presymptomatic stage by changes in behavior, diet, and/or pharmaceutical manipulations; and that the screening does not result in any harm or discrimination.

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  • Virtually every organism serves as the host for a complement of parasites. Parasitism is so common that it is rare to find classes of animals without members that have adopted a parasitic mode of living. Evidence gained from various archeological studies indicates that parasitic diseases existed in prehistoric human populations. Since there is no evidence to suggest that our long and intimate association with parasites will ever end, it seems reasonable to propose that the study of human parasites warrants some consideration.

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  • Allelic Association, Linkage Disequilibrium, and Haplotypes Allelic association refers to a situation in which the frequency of an allele is significantly increased or decreased in individuals affected by a particular disease in comparison to controls. Linkage and association differ in several aspects. Genetic linkage is demonstrable in families or sibships. Association studies, on the other hand, compare a population of affected individuals with a control population.

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  • Manypeoplehavehelped make this book possible. I especially want to thank George J. and KathleenWatersMatthews, whose support for scholarship at Northeastern University has made this book possible. I also want to thank my dean, Emily Spieler, for gener- ous research support and a schedule conducive to writing. Many thanks are also owed to my wonderful colleagues at Northeastern University School of Law.

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  • Chapter 19 - Variation and selection in populations. This chapter involves the study of how genetic laws impact the genetic makeup of a population. Mendelian principles are the basis for the Hardy-Weinberg law which allows one to calculate allele and genotype frequencies from one generation to the next. The Hardy-Weinberg law can be used only if other forces are not acting on the allele frequency. Those forces include selection, migration, mutation, and population size.

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  • We used the genotyping data generated by the International HapMap Project to study the patterns of linkage disequilibrium (LD) in human genic regions. LD patterns for 11 998 genes from 11 HapMap populations were identified by analyzing the distribution of haplotype blocks.

    pdf8p cosis54 09-12-2012 17 1   Download

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