3.1 Introduction On an autumnal morning in November 1994, a group of people gathered at Regent's College, London, conscious that they were making history. The purpose of the meeting was to discuss an important issue: plant biotechnology and how it should be regulated in the UK. At the time, the genetic engineering of plants was emerging as a technology of great potential for the development of new pest-resistant, higher yield crops, although the technique hadn't attracted the degree of media attention and pub
1 How did the notion of public dialogue arise? There is a good case to be made that the emphasis on ‘dialogue’ in relation to science and the public in the UK coincided with the publication in 2000 of the House of Lords report on Science and Society. But the impact of that report has to be seen in the context of what was happening under the ‘public understanding of science’ (PUS) banner in the years between the publication of the Bodmer report (1985) and the House of Lords report 15 years later. In the UK, this period
6.1 Control of Substances Hazardous to Health (COSHH) Regulations For those companies involved in the handling of chemicals and/or biological material there are a number of additional regulations. These are known as the Control of Substances Hazardous to Health (COSHH) Regulations. These were introduced in 1988, and the last update was in 1999. These regulations apply to chemicals, biological hazards and dusts. The essential requirements are that the employer must: make an assessment of the health risk to empl
1 History of health and safety The discipline of health and safety is relatively modern, only developing in the last century. However, throughout the ages people have voiced their concerns about people being exposed to harmful substances. Hippocrates mentions in the 4th century BC that lead miners and workers tended to suffer from diseases. The phrase ‘mad as a hatter’ was coined because mercury used in the hat industry caused mental illness. In 1775 Pott reported that chimney s
References 5 Summary At the time of writing (2006) a relatively small number of types of GM crop have been grown globally, in a limited number of countries. The take-up of these crops has been relatively high in countries like the USA and Canada, but very much lower in Europe. However, there is a very rapid increase in the growth of GM crops in developing countries. The technique most commonly used to introduce new genetic material into dicots has involved the use of a modified soil bacterium, Agrobacter 4.1 Vitamin A deficiency Vitamin A, more properly known as retinol, is an important chemical intermediate in a number of biochemical processes in mammals. It is involved in vision, and is found in the rod cells of the retina of the eye. These cells are particularly important in seeing at low light levels, and night blindness is a symptom of vitamin A deficiency (VAD). Vitamin A is also involved in the proper functioning of the immune system. Children suffering from VAD are prone to serious infections, and often die f 2.1 Crown gall disease: genetic engineering in nature A. tumefaciens causes crown gall disease in a wide range of dicotyledonous plants. (Dicotyledonous plants, are also known as dicots, have broad leaves with branching veins. An example would be a broad leaved tree like an oak. Narrow leaved plants with parallel grains such as grasses are known as monocotyledonous plant or monocots.) The infection normally occurs at the site of a wound in the plant. The disease gains its name from the large tumour-like swellings, or galls, that o Introduction This unit is from our archive and it is an adapted extract from Human Biology and Health (SK220) which 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 looks at the human being in the context of an individual life cycle, examining some of the processes that Learning outcomes By the end of this unit you should be able to: using information from wells, the topography of the ground and a water table contour map, carry out the following: interpret cross-sections, calculate the thickness of the unsaturated zone, and the rate of groundwater flow; deduce the direction in which groundwater is flowing; and estimate the depth to the saline interface in a coastal area from the height of the water table; list the types of rock that usually make g 3.2 Uranium occurrence and ore deposits In igneous rocks, uranium is more abundant in granites (~3.5 ppm) than in basalts (~1 ppm). The large size of the uranium atom prevents it from easily entering the structures of common rock-forming minerals, so it is an incompatible element that tends to remain in magmas until a late stage of crystallisation, when it enters minor minerals, or even the uranium oxide, uraninite (UO2). In suitable circumstances, following fractional crystallisation of uranium-rich granitic magm 1.3.2 Peat formation in raised mires Mires can also form inland within low-lying depressions, provided the rate of precipitation exceeds the rate of evaporation (Figure 4a). Peat is impermeable and so its accumulation progressively impedes drainage. This attribute gives mires the ability to maintain a water table independent of the area surrounding them. 1.3 Coal-forming environments today Coal formation begins with preservation of waterlogged plant remains to produce peat and then slow compression as the peat is buried. About 10 m of peat will compress down to form about 1 m of coal; clearly large amounts of plant debris must be available for preservation. Even so, for a significant thickness of peat to accumulate there must be a balance between the growth of plants and the decay of underlying dead material to form peat (a process known as humification). Su 1.2 The origins of coal If you examine a piece of coal, at first sight it appears black and rather homogenous. However, closer inspection generally shows a series of parallel bands up to a few millimetres thick. Most obvious are shiny bands that break into angular pieces if struck. Between them are layers of dull, relatively hard coal and thin weak layers of charcoal-like carbon. Coal splits easily along these weak layers, which crumble to give coal its characteristic dusty black coating. Microscopic examinati 1.1 Introduction There are many environmental reasons why coal is a rather undesirable source of energy. Burning it introduces large amounts of gases into the atmosphere that harm the environment in a variety of ways, as well as other, solid waste products. Coal extraction leads to spoil heaps and mines that scar the landscape, land subsidence that affects roads and buildings, and in some cases water pollution. With apparently so little going for it, why do we rely so much on coal to meet our energy nee 3 DNA: Spot the difference Here we look at DNA, the molecule which contains the instructions for making each living creature. It is contained within the genes of every individual living thing on Earth. Closely related creatures have DNA that is very similar, and distantly related creatures have DNA that is very different. By looking at how similar or different their DNA molecules are, we can see how closely related two species are. 2 Odd one out The image below shows models of four mammals: Rhinoceros Whale Elephant Hippopotamus 4.2 Peptide signal sequences The distinct chemistry of proteins at the N- and C-termini provides protein molecules with two positionally and chemically unique sites for post-translational modifications and with the means to control their spatial and temporal interactions and position. This feature of proteins is crucial for a variety of biological processes from protein degradation to protein sorting for specific cellular compartments. The N- and C-termini of proteins have distinct roles, and we have already emphasised t 4.2 Summary Glycogen metabolism is controlled by two enzymes, glycogen synthase (mediating glycogen synthesis) and phosphorylase (mediating glycogen breakdown). Three pathways converge in the regulation of glycogen synthase: cAMP/PKA and GSK-3β are negative regulators, whereas ISPK/PP1G positively regulate the activity of glycogen synthase. Insulin and adrenalin have opposite effects on glycogen synthesis: insulin promotes glycogen synthes 3.9 Summary Heterotrimeric G proteins are tethered to the internal surface of the plasma membrane, and are activated by conformational change within 7TM receptors. There are many different α subunits (and a few βγ subunits), which interact with different receptors and different effectors. The major targets of G proteins include ion channels, adenylyl cyclase (activated by Gαs and inhibited by Gαi) and PLC-β (activated by Gαq).
