Evolution and genetics

Xem 1-20 trên 65 kết quả Evolution and genetics
  • Life on Earth originated and then evolved from a universal common ancestor approximately 3.7 billion years ago. Repeated speciation and the divergence of life can be inferred from shared sets of biochemical and morphological traits, or by shared DNA sequences. These homologous traits and sequences are more similar among species that share a more recent common ancestor, and can be used to reconstruct evolutionary histories, using both existing species and the fossil record. Existing patterns of biodiversity have been shaped both by speciation and by extinction....

    pdf56p kennybibo 10-07-2012 65 25   Download

  • Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học thế giới đề tài: Lack of congruence between morphometric evolution and genetic differentiation suggests a recent dispersal and local habitat adaptation of the Madeiran lizard Lacerta dugesii

    pdf0p toshiba19 15-11-2011 11 1   Download

  • Information Theory, Evolution, and the Origin of Life presents a timely introduction to the use of information theory and coding theory in molecular biology. The genetical information system, because it is linear and digital, resembles the algorithmic language of computers. George Gamow pointed out that the application of Shannon’s information theory breaks genetics and molecular biology out of the descriptive mode into the quantitative mode, and Dr. Yockey develops this theme, discussing how information theory and coding theory can be applied to molecular biology....

    pdf272p camchuong_1 04-12-2012 31 10   Download

  • When did humans appear? What is it that makes us different from the rest of the animals? In what way did language develop? Why is it so important to have deciphered the sequence of the human genome? This book offers answers to these and many other questions about the mysteries and marvels of human evolution. Scientists maintain that modern humans originated in Africa because that is where they have found the oldest bones.

    pdf56p maket1311 16-10-2012 19 3   Download

  • Increasing attention has also been given to dissecting and understanding diversity in relation to genes underlying important agronomic traits in a number of crops. Molecular phylogenetics and genetic diversity analysis can help to clarify the taxonomic identity and evolutionary relationships of the wild relatives of crop species. These methods can also help prevent misidentification and carefully plan effective germplasm management strategies.

    pdf414p conquynho32 18-09-2012 33 6   Download

  • Understanding the origins of humanity has long been one of our foremost intellectual pursuits, and one that greatly interests the general public as evidenced by museum attendance and by numerous media productions and general interest publications. Progress toward an improved understanding of our heritage is a continuing challenge for the scientific community, requiring advances in a range of disciplines that include archaeology, anthropology, geology, biology, oceanography, and genetics, and particularly research advances in areas where two or more of these fields intersect.

    pdf128p camchuong_1 04-12-2012 14 4   Download

  • L-Arabinitol 4-dehydrogenase (Lad1) of the cellulolytic and hemicellulolytic fungusHypocrea jecorina(anamorph: Trichoderma reesei) has been implicated in the catabolism ofL-arabinose, and genetic evidence also shows that it is involved in the catabolism of D-xylose in xylitol dehydrogenase (xdh1) mutants and of D-galactose in galactokinase (gal1) mutants of H. jecorina.In order to identify the substrate specificity of Lad1, we have recombinantly produced the enzyme inEscherichia coliand purified it to physical homogeneity....

    pdf9p dell39 03-04-2013 9 2   Download

  • Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Minireview cung cấp cho các bạn kiến thức về ngành y đề tài: Analysis of genetic systems using experimental evolution and whole-genome sequencing...

    pdf5p thulanh20 10-11-2011 18 1   Download

  • This first research project deals with the Human Genome Project, the genetic sequencing exercise of humanity. An extraordinary international project of biological science will add new, and undo old, knowledge about our evolution as a species. ’It is, though, a controversial subject, and we thought we would start in two phases. Dr Jeff Lever’s paper published here worries aloud whether we teach evolutionary theory properly and with sufficient depth to pupils and scholars at our schools.

    pdf0p quatet 14-01-2013 12 1   Download

  • The very latest research is uncovering a stream of evidence revealing evolution in action - from the actual observation of a species splitting into two, to new fossil discoveries, to the deciphering of the evidence stored in our genome. Why Evolution is True weaves together the many threads of modern work in genetics, palaeontology,geology, molecular biology, anatomy, and development to demonstrate the 'indelible stamp' of the processes first proposed by Darwin. It is a crisp, lucid, and accessible statement that will leave no one with an open mind in any doubt about the truth of evolution....

    pdf330p fangfangfang 11-05-2012 145 24   Download

  • 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).

    pdf415p hellsaint 21-12-2011 45 16   Download

  • The theoretical metrics developed, such as genetic variance and heritability (Fisher, 1930; Wright, 1931), provided the quantitative standards necessary for the evolutionary synthesis. Further research has focused on the origin of genetic diversity, its maintenance and its role in evolution. Simple questions such as “who breeds with whom” initiated studies on the relatedness of populations.

    pdf548p conquynho32 18-09-2012 54 11   Download

  • Genetic programming (GP) is a branch of Evolutionary Computing that aims the automatic discovery of programs to solve a given problem. Since its appearance, in the earliest nineties, GP has become one of the most promising paradigms for solving problems in the artificial intelligence field, producing a number of human-competitive results and even patentable new inventions. And, as other areas in Computer Science, GP continues evolving quickly, with new ideas, techniques and applications being constantly proposed....

    pdf0p cucdai_1 19-10-2012 32 10   Download

  • As a research scientist in the area of human nutrition, I have observed a sea change in emphasis within my field over the past 10–15 years. There have always been dynamics within the subject: During the first half of the twentieth century, scientists grappled with discovering the essential micronutrients and with characterizing the biological effects of their deficiency. This interest in “too little” was supplanted in the mid-1980s by a preoccu- pation with too much—too much fat, too much sugar, and too much obesity.

    pdf153p tiramisu0908 25-10-2012 30 9   Download

  • How different levels of genetic variance affect the rate of evolutionary change within populations has also been intensively studied. Such changes were originally studied using phenotypic markers: variation among individual plants in traits, such as leaf shape or flower color (Ward et al., 2008). Subsequently the detection of genetic variation has become more sensitive, firstly through the utilization of variation in enzymes (allozymes) and then through PCR-based marker systems allowing direct examination of DNA sequence variation.

    pdf288p conquynho32 18-09-2012 21 7   Download

  • The Directive culminated in the passage of the 1989 Companies Act. Specifically, we explore how the UK accountancy profession and the government were concerned to construct, articulate and negotiate particular meanings of what it is to be professional, self regulated, independent and commercial. The second episode concerns the impact on the accounting profession of the Financial Services Act. Initially, this regulation, developed to improve "investor protection" as well as to abolish restrictive practices, was understood to be unrelated to the work of accountants.

    pdf28p taisaovanchuavo 26-01-2013 12 6   Download

  • The Project Gutenberg EBook of Evolution in Modern Thought, by Ernst Haeckel and J. Arthur Thomson and August Weismann This eBook is for the use of anyone anywhere at no cost and with almost no restrictions whatsoever. You may copy it, give it away or re-use it under the terms of the Project Gutenberg License included with this eBook or online at www.gutenberg.org Title: Evolution in Modern Thought Author: Ernst Haeckel J. Arthur Thomson August Weismann Release Date: August 29, 2007

    pdf876p khangoc2392 26-09-2012 21 5   Download

  • The Project Gutenberg EBook of Lamarck, the Founder of Evolution, by Alpheus Spring Packard This eBook is for the use of anyone anywhere at no cost and with almost no restrictions whatsoever. You may copy it, give it away or re-use it under the terms of the Project Gutenberg License included with this eBook or online

    pdf0p khangoc2392 26-09-2012 19 4   Download

  • The single coherent form is particularly difficult to describe and assess because of the fluid transitions between the form elements which sculptor Erik Thommesen [8] have chosen to divide his sculptures in. First and foremost Thommesen uses theoretical dividing of a form into form elements when balancing the form into a harmonious whole by scaling and shifting each form element. Other effects such as rhythm, contrast, and activation of space can be processed in the same way [9]. The theoretical division of the form sometimes trigger a physical division.

    pdf27p giamdocamnhac 06-04-2013 26 4   Download

  • In this book, we introduce a new type of algebra, which we call evolution algebras. These are algebras in which the multiplication tables are of a special type. They are motivated by evolution laws of genetics. We view alleles (or organelles or cells, etc,) as generators of algebras. Therefore we define the multiplication of two “alleles” Gi and Gj by Gi · Gj = 0 if i = j. However, Gi ·Gi is viewed as “self-reproduction,” so that Gi ·Gi = j pijGj, where the summation is taken over all generators Gj .

    pdf135p camchuong_1 04-12-2012 23 3   Download

Đồng bộ tài khoản