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U.S. Day Ahead: Obama meets with state leaders on "cliff"
In round #2 of this week's "fiscal cliff" talks, President Obama meets at the White House with a bipartisan group of governors, including Delaware's Jack Markell and Wisconsin's Scott Walker.
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The Paganini Project with Peter Sheppard Skærved
Polymathic and ever-curious British violinist Peter Sheppard Skærved delves into the Library's fascinating Niccolò Paganini collection. Examining posters, playbills, letters, manuscripts and memorabilia collected by Paganini himself, he reveals how the virtuoso created his own mystique as a violinist and musical innovator. From his "Secret Red Book" containing recipes, prescriptions, tour dates, a laundry list and financial notes, to clues about the virtuoso's alleged use of a steel bow, our P
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Strengthening Capability of State Universities on Vulnerability Assessment to Enhance their Role in
By: UP Los Baños Presentation by Dr. Amparo M. Wagan, University Extension Specialist, University of the Philippines Los Banos, Philippines. Delivered during the International Conference on Climate Change Impacts and Adaptation for Food and Environmental Security, November 21-22, 2012 at SEARCA, UPLB, College, Laguna, Philippines.
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Groter en kleiner dan
groter_dan_kleiner_dan.JPG

Leerlingen vergelijken twee getallen en plaatsen er het juiste teken (>, < of =) tussen. Er wordt gewerkt met getallen tot en met vijf.


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5.2 The pharmaceutical background

The existence of alpha receptors had been known for many years, and the obvious approach of trying to block these receptors, and hence prevent the noradrenaline from binding, had already been tried by many research groups. A number of compounds with alpha-blocking activity had been identified, including one called prazosin (2) discovered by Pfizer at their US research laboratories in Groton. Substances such as prazosin which block agonist action are called antagonists.


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2.4 What does relationship mean in systematics? E. Mayr

Activity 3

0 hours 5 minutes

Dr. Patterson looks at the second of his three systematists, Ernst Mayr. Mayr’s answer to the meaning of ‘relationship’ in systematics comes from the point of view o
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2.2 Darwin, Linnaeus and Simpson

Activity 1

0 hours 15 minutes

In the first clip, Dr. Colin Patterson introduces and explains Darwin’s ‘tree of life’, image, shown below (Figure 3). This was the only image included in his book,
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2.1 Introduction

The late Dr. Colin Patterson was a palaeontologist at the Natural History Museum, and an authority on systematic methods. He played a prominent role in promoting cladistics, the method now most widely employed for phylogenetic analysis. He introduces the sequence of audio clips by drawing attention to the connection perceived by Darwin beteen the systematic grouping of species into higher taxa and the closeness of their evolutionary relationships (‘propinquity of descent’).

This lea
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1.5 Clades and mammals

SAQ 3

Are the mammals a clade?

Answer

Yes, despite Simpson's earlier reservations about their possible polyphyletic origins, morphological and molecular data now st
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1.3 Relationships between species

SAQ 1

Using the idea of blood relationships in people as an analogy, can you think of two distinct types of relationship between species?

Answer

One is the relation
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1.1 Introduction

To the lay person, it might seem surprising that there is any problem with the recognition of higher taxa. The very existence of long-established vernacular names for inclusive groupings of species (e.g. finches, thrushes, parrots and hawks as distinct groups of birds) suggests that higher taxa are self-evident. Accordingly, the task of the taxonomist might seem merely to consist of recognising these groupings and assembling them in a hierarchy of increasingly inclusive categories.

Inde
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Introduction

This unit is from our archive. It is an adapted extract from the Science (S365) module that is no longer in presentation. If you wish to study formally at The Open University, you may wish to explore the courses we offer in this Curriculum Area

This unit is concerned with macroevo
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Acknowledgements

Except for third party materials and otherwise stated (see terms and conditions), this content is made available under a Creative Commons Attribution-NonCommercial-ShareAlike 2.0 Licence.

Grateful acknowledgement is made to the following sources for permission to reproduce material in this unit:

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4.2 Intermediate forms

In essence, the argument about intermediate forms runs as follows. If whales evolved from a terrestrial ancestor through the accumulation of small differences over time, we should expect to find the fossils of a number of ‘missing links’, i.e. creatures with a mixture of terrestrial and aquatic characteristics. In fact, we might expect to find a succession of such animals, each a little bit more whale-like and a little bit less well adapted to life on land than its predecessor.

To m
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3.6 Summary of Section 3

  1. The electronic configuration of an atom can be obtained by allocating its electrons to s, p, d and f sub-shells in the order given by Figure 21. This procedure generates a periodicity in electronic configuration which matches that of the Periodic Table.

  2. The typical elements have
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1.2.1 Isotopes

All atoms of the same element have identical atomic numbers, and are chemically similar, but they may not be identical in other ways. Figure 2f shows copper. All copper atoms have atomic number 29: all their nuclei contain 29 protons. But they also contain uncharged particles called neutrons. In natural copper, the a
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2.8 Descriptive statistics

Scientists collect many different types of information, but sets of data may be very loosely classified into two different types. In the first type, so-called ‘repeated measurement’, an individual quantity is measured a number of times. An astronomer wanting to determine the light output of a star would take many measurements on a number of different nights to even out the effects of the various possible fluctuations in the atmosphere that are a cause of stars ‘twinkling’. In the seco
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Mathematical language
In our everyday lives we use we use language to develop ideas and to communicate them to other people. In this unit we examine ways in which language is adapted to express mathematical ideas. First published on Tue, 28 Jun 2011 as Author(s): Creator not set

Modelling heat transfer

The main teaching text of this unit is provided in the workbook below. The answers to the exercises that you'll find throughout the workbook are given in the answer book. You can access it by clicking on the link under the workbook.

Click 'View document' to open the workbook (PDF, 0.4 MB).

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