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4.5.3 Dative bonds

So far, the bonds in our Lewis structures have been shared electron pairs made by taking one electron from each of the two bound atoms. But this need not necessarily be the case. In Sections 4.5.1 and 4.5.2, we encountered the colourless gases NH3 and BF3. When these gases are mixed, a solid compound H3NBF3 is formed as a dense white smoke. The chemical equation for the process is:


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Rich Interpretations of the Face
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6 Conclusion

  1. It is essential that societies seek ways of becoming environmentally sustainable and adaptable to unknowable environmental changes, particularly in the climate. This must happen in the context of globalisation. The concept of sustainability is coming to prominence at a time when established structures of government are being questioned and new ways of thinking about governance are being explored.

  2. Globalisation has several dimensions that are r
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Virtual Maths - Numbers, Geometry 2D shapes
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Iron Bridge K060290

IRON BRIDGE, Telford, Shropshire. Detailed view of the iron work.


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15.835 Entrepreneurial Marketing (MIT)
This course clarifies key marketing concepts, methods, and strategic issues relevant for start-up and early-stage entrepreneurs. At this course, there are two major questions: Marketing Question: What and how am I selling to whom? New Venture Question: How do I best leverage my limited marketing recourses? Specifically, this course is designed to give students a broad and deep understanding of such topics as: What are major strategic constraints and issues confronted by entrepreneurs today? H
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1.3.4 Hormonal control of sperm production

The most important hormone involved in controlling sperm production is a steroid called testosterone. This is produced in the testis itself, by the Leydig cells (see Figure 12a). The testosterone is released from the Leydig cells between the tubules, and taken up by the neighbouring Sertoli cells. The Leydig cells are stimulated to make testosterone by two other hormones, luteinizing hormone (LH) and follicle-stimulating hormone (FSH), which are both produced by the pituitary gland and
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Acknowledgements

The content acknowledged below is Proprietary (see terms and conditions) and is used under licence.

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

Unit Image

Krystia
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8.4 When surgery is required

For some cardiovascular disease patients, surgery may be carried out as an emergency procedure or become an inevitable progression, following on from drug therapy. There are various degrees of surgery carried out, ranging from the fairly routine and minorly invasive procedure of coronary angioplasty to the major life-saving heart (or heart and lung) transplant. While it is important to understand all of the detail of surgical procedures and how the cardiac surgical team work together, it is a
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2.2 Effective communication

Whilst effective communication is an essential skill for the project manager, most people tend to be over-optimistic about the accuracy and efficacy of the communication process. Achieving understanding can be difficult, especially in the atmosphere of change and uncertainty generated by a major project. Verma (1996) identifies the following barriers to good communication.


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3.2 Sub-state forms of nationalism

The advancement of democracy in contemporary Western nation-states and the intensification of globalisation processes have encouraged the re-emergence of nationalist movements representing oppressed or silenced nations that demand the right to self-determination. In the case of ethnic groups formed by people of immigrant origin, democracy has provided them with the tools to pursue the right to develop and practice their indigenous culture and language alongside those of the host country. One
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