2 December 2016
Professor Ronald Eccles, of the Common Cold Research Centre at Cardiff, delivered an encyclopaedic review of current knowledge of the common cold and ‘flu’.
The common cold is the symptom of an infection by one of two hundred odd viral sereotypes of cold viruses. There are three main types of cold virus - 30% -50% are rhinoviruses, 10% - 15% are corona viruses and about 10% RSV (respiratory syncytial virus). Most of us get two to five colds a year, children about ten to twelve.
Unlike other human-specific viruses, for example polio, measles, or smallpox, where infection confers lifelong immunity, cold viruses can vary their surface antigens, allowing repeat infections to occur.
Influenza virus pandemics are set off by replication of a new variant of flu genotype, which evolves from crossover in multiple infected cells. The WHO continues to screen for the appearance of new viral sereotypes to update vaccine production.
Symptoms of cold and flu virus infections such as blocked sinuses, fever, aches, pains and coughs are all part of the human body’s fight back to the infection, mediated by prostaglandins and bradykinins. However, often infections do not cause any noticeable symptoms at all.
There are no known cures for cold and flu virus infections, except for alleviating the symptoms. However, the development of neuranimidase inhibitors, which block viral attachment of influenza viruses, are promising developments.
Nasal blockage and sinus swelling in a rhinovirus infection is annoying, and causes the temperature in nasal cavities to increase from the usual 28°C to 37°C. However, this limits rhinovirus replication, meaning decongestants can be counter productive.
This and many other anecdotes made for a most interesting and informative talk to which this report hardly does justice.
12 November 2016
The RSPB reserve on the bank of the Afon Conwy in North Wales is a rather special site. It was created from the millions of tonnes of spoil removed from the bed of the estuary when the six box sections of the A55 undersea road tunnel were being installed in 1991.
This is not the only amazing engineering within sight of the reserve: across the water is Robert Stephenson’s 1849 cast-iron box railway bridge, alongside Thomas Telford’s 1826 road suspension bridge, in the shadow of Edward I’s mighty castle of 1285.
The North Wales Branch came, not only to walk around the reserve and view the wildlife in the two large lagoons, but also to learn how the environmental footprint of the reserve’s operation has been lessened in recent years. John and Rosie Solbé (both Fellows of the Society and volunteers at the reserve) have been part of a team reducing the consumption of electricity (by 87,000 kWh, from 2008 to 2015), reducing water use, organising the reduction, re-use and recycling of waste materials and limiting the use of hazardous products (mostly paints and cleaning products).
The day opened with a description of the site and its history by reserve manager Julian Hughes. From the early days of Portacabins the site now supports a coffee shop, visitor centre with education room, a comfortable look-out built of straw-bales (so no heating required), a children’s play area, dipping pond, board walks through the reed beds, covered hides and viewing screens, all set against the backdrop of the castle, the estuary and the mountains above the glaciated valley of the Conwy. More than 80,000 visitors are welcomed each year. The visitor centre now supports 44 photovoltaic panels; the coffee shop pre-heats its water with roof-mounted vacuum tubes and almost all the lights are LED. Waste water is treated in a three-phase septic tank and ‘polished’ in a newly installed reed-bed system.
Further measures have been applied throughout their offices, bathrooms and kitchens. John gave the results as graphs, kW and ££s and showed the relationship between environmental conditions and power and water consumption and even how the number and demographics of the visitors influence these figures.
After the talks the members had an informative guided tour with Julian, who covered not just the birds (230 species so far recorded, including great white egrets) but also some of the very rare moths and their food plants in this habitat, formed by machinery and colonised by nature.
Mergansers and the first goldeneye of the year performed on the lagoons where teal rested; snipe didn’t quite escape our notice; little egrets stalked the estuary and a flock of linnets did their bit to give us a delightful day.
3 March 2016
Dr Steve Thompson, Partner Associated Petroleum Technologies UK, delivered a comprehensive review of petroleum formation and accumulation as part of the branch's guest lecture.
Bacteria and fungi act on accumulated sedimentary organic carbon over time to produce Keragen, from which petroleum is derived by heat and pressure at depths of 2700 to 4900 metres. The oil and gas formed migrate upwards by bouyancy until trapped under impermeable rock, ready for the oil drill.
The derived petroleum contains saturated alkanes, aromatic hydrocarbons, heterocyclic hydrocarbons, and huge polymeric asphaltenes. Isoprenoid alkanes are ubiquitous, derived from chlorophyll side chains of photosynthetic organisms and purple sulfur bacteria, highlighting the biological origins. High performance liquid chromatography of the petroleum gives a chromatogram of hydrocarbon species on which oil well development depends.
Archeobacteria can degrade petroleum in cool shallow reservoirs, but hot deep burial prevents this. Many oil discoveries can be rendered uneconomic because of microbial degradation of over half the oil fraction. Biodegradation of petroleum deposits and the released methane is probably the source of vast gas deposits in Siberia.
To conclude, Steve discussed the formation and stability of methane clathrates, where methane derived from microbial degradation forms complexes with ice. Global warming could raise ground temperatures in permafrost areas with sudden vast releases of methane as ice melts.
A sobering thought to end the talk.
3 December 2015
Professor Brian Moss talked to the North Wales branch on inadequacies of current conservation policies. The problem, he said, was that, because the British landscape had been dissected for so long, sight had been lost that it was part of a continuous global system, on which major element cycles depended.
The Americans, in creating wilderness National Parks, had been more successful, but even they had made mistakes, in managing for human ends, rather than allowing self-regulation with an intact biota.
Professor Moss showed how global systems for carbon and oxygen cycling needed continuity and how the chemistry of the atmosphere, oceans and soils depended on biological processes that maintained the biosphere in a condition where liquid water was able to persist, and life could flourish.
Pristine land vegetation was parsimonious with nutrients, but various short-cuts had developed, including movements of nutrients by Pacific salmon among the oceans, rivers and surrounding forests, where scavengers like bears had important roles. In pristine African floodplain lakes, movements and dunging by large herbivores created a near pristine system, with turbid water and algal blooms that would be perceived, perhaps wrongly, as highly damaged in Europe.
There is increasing palaeolimnological evidence for large mammal herds and nutrient-rich conditions everywhere in the early Holocene. That has implications for how we now perceived reference states for lake restoration.
Conservation policy in Britain is dominated by parochial attitudes that essentially garden postage stamps of nature reserves, and ignore effects of catchment damage on freshwaters. It is faced with a much abused, polluted, engineered, manipulated and divided system. There is no way that a state even remotely answering that required by the Water Framework Directive (slightly different from no or negligible human influence) could easily be achieved under current conservation policies.
Government conservation agencies are less independent than ever before and have devised assessment schemes that allow boxes to be ticked for the pleasure of uncomprehending Government, rather than biodiversity to be genuinely conserved. Likewise, the Water Framework Directive has been betrayed by creation of liberal and politically motivated standards, with much propaganda but no net improvements over the past six years.
Moreover, like the backgrounds of virtually all world leaders, those of the Board members of both Government and Non-Government Agencies reflect a dominance of business, finance, law, politics, the military and hard engineering, with only marginal expertise in ecology. All of which might cause us to shrug our shoulders, for that is how the Establishment operates.
But with climate change, everything changes. Parochial national attitudes are counter productive and diversionary. Climate change is mutually linked with western overconsumption, with poverty, war and population growth in the developing world, and loss of three quarters of the biomes, which provide the best carbon stores.
Unless carbon emissions are reduced very rapidly, we must mop up the surplus carbon of over 4 gigatonnes, accumulating in the atmosphere each year, with new and replacement stores.
Temperature will not begin to fall until emissions are annually matched by storages. The scale of the problem is that about one-third of current world agricultural land would need to be rewilded to functioning biome, with immense implications for human societies.
Perhaps we will not succeed and will face catastrophic consequences, but we should heed what W H Auden wrote in 1947: We would rather be ruined than saved; we would rather die in our dread than climb the cross of the moment and let our illusions die.
10 October 2015
John Baker, a valued volunteer at Erddig, arranged this visit and talk from head gardener Glyn Smith.
Seven members and guests met on a sunny autumnal day and were led to a vast display of apple varieties ‐ 148 of the orchards collection. The apple crop has already been picked and was ripening in empty greenhouses ready for sale.
Glyn gave a brief history of the origins of domesticated apples from the European crab apples (Malus sylvestris) to the modern day sweet apples (Malus pumila spp). Apple varieties of were long thought to be hybrids of the two, but recent studies of DNA and history traces M. pumila type apples back to the Tien San region of Kazakstan, coming along the Silk Road to Europe.
Though the Erddig apple collection holds 148 distinct varieties, requests for identification of apples is still a bit of an art, rather than a science. DNA markers will come. Apples are hermaphrodites, but self incompatible to their own pollen, hence the requirement of cross pollination by other pollination groups determined by overlapping flowering periods. But, as Glyn remarked, you could hold early flowers in the fridge and get fertilisation.
Human selection and crossing of apple varieties have led to the 'sweetest' apple Golden Delicious. As well as supermarket varieties bred for rough handling and colour uniformity - at the cost of taste!
The apple taste is influenced by the presence of tannins from almost nothing in Golden Delicious to the almost inedible cider apple varieties. Crossing apple varieties produces incredibly varied offspring ‐ hence selected varieties are and have been maintained by grafting for a 1000 years or more of DNA replication.
Glyn finished the visit by giving a tour of the garden. He discussed its history, the future of funding and teaching/training of future horticulturists. Members and guests finish an enjoyable day with an excellent lunch in the Trust's restaurant.
4 December 2014
This was the subject of a talk by Adrian Lloyd Jones of the North Wales Wildlife Trust to members and friends of the North Wales branch at St Asaph in early December. The lecture was followed by the branch AGM and an excellent buffet at the Bod Erw Hotel.
Adrian has led the project on returning the beaver to Wales since 2005, a period in which he has examined the habits of the European beaver Castor fiber in parts of mainland Europe where beavers have lived for decades.
In Wales beavers were already very rare in the time of Giraldus Cambrensis (1188), hunted for their valuable pelt, their meat and other bits of their anatomy which were thought to have medicinal properties! In the case of their castor sacs this may have been real, since beavers eat willow and castoreum contains salicin but in the case of their testicles the effects were a myth.
Credit: Allard Martinius
Canadian beaver and European beaver cannot interbreed (distinctly different numbers of chromosomes). In the UK they can be found in zoos, in secure enclosures and also in the wild.
Looking at the ecology and habitat of beaver on the European mainland provides clues on how beaver might respond to and affect UK habitats. They don't eat fish (!); they do like aspen; they are not keen on conifers; they eat bark when they need to; they do burrow as well as build lodges; they live together as two generations and when a third generation arrives the second must leave.
They defend their territory against intruding beaver and their fights can be serious! Typically they take charge of 3km of shoreline and only a very small fraction of their lives is spent more than 20 metres from the water's edge.
Beaver make dams up to about one metre in height. They fell trees for this purpose and open up the riparian canopy, increasing the variation in age-class structure of the trees. The response of the nibbled or felled trees is to put out suckers so they increase young growth. The dams provide an underwater entrance to their lodges.
Dams can affect water quality and the hydrograph because they act as silt and nutrient traps and their structure as well as resultant ponds provide additional wildlife habitat. Beaver are considered as keystone species providing benefits for others. It is said that the biomass of fish in a beaver area is as much as 80 times greater than elsewhere. When beaver abandon a lodge, otters can move in.
Beaver can damage field crops but this tends to occur where the riparian buffer zone is very narrow. Their burrows can collapse and they can drill through dykes. Control measures include, amongst other things, electric fencing, trapping (using apples as bait) and removing animals but it has been estimated that the benefit of beaver outweighs the cost of control measures 100-fold.
In Wales there are excellent locations for planned experimental releases of beaver but sites are now sought where problems are more likely to occur than in the more isolated upland valleys originally proposed. This will allow investigation of their impacts on aquatic features such as salmon, and provide experience in addressing negative impacts. Watch this space!
14 March 2014
This was the intriguing title of Tim Hall's talk in Bangor University to a lecture theatre packed with students, staff, members and friends the branch. David Urry, regional coordinator at the Society, began proceedings by introducing the role and benefits of the Society.
Worldwide, 50% of people now live in cities and the figure is even higher (80%) in the UK. Cities include trees to a greater or lesser extent. Trees in such close proximity to city dwellers are termed urban forests. Are trees beneficial? How? Is there a financial, social, psychological or environmental gain?
Tim, from the Woodland Trust for Scotland addressed these questions using examples from around the world. Consider the effect of a row of deciduous trees in a street of typically mixed use. In summer the trees shade the buildings and pavements, and thus lessening the need for air-conditioning. Mature tree can act as an evaporative cooling system, evapo-transpiring 450 litres of water each day. In winter the leaves have fallen so the bare branches allow warmth and light through and thus reduce the amount of heating required, while also lessening the wind-chill factor on the structures and still absorbing some of the traffic noise.
Trees scour particulates and even some undesirable gases from the urban atmosphere. In Chicago it is calculated that trees remove 10.8 tonnes of particulate pollutants each day. They lessen the impact of rainfall with its effects on soil and sediment run-off and retain moisture in their root systems.
Yes, there can be problems when trees are not managed correctly: roots can undermine buildings or disrupt the many services which are now routed below our pavements. Dead branches can fall or violent winds fell even the strongest trees. But think of the advantages – the pleasant walk to work or the shops under a canopy of leaves; the great benefit of parkland as originally conceived by the Victorians; the ecosystem diversity trees offer; the health benefits (apparently there is an inverse correlation between childhood asthma and urban tree density).
Tim's hitchhiking was a success, without recourse to his towel or the number 42.
5 October 2013
Members joined students from Prifysgol Bangor on a fungal foray to Treborth, the University's botanical garden. The autumn colours had hardly developed in this Indian summer but the fungi made up for this with an amazing array of hues from blush pink, through orange and brown to white, deep violet and black.
Our knowledgeable guide Nigel Brown explained some of the intricacy of fungi, the challenges they presented to the taxonomist, their many strategies for reproduction and survival, their chemical complexity and the delights and affronts they could impose on our senses.
The most deadly (to plants) honey fungus Armillaria mellea was in profusion with its fruiting bodies lined up along the lawns. This was a puzzling. The fungus is a root parasite but it made its way straight across the grass and not around a tree. Perhaps its black rhizomorphs were following a straight root run from a distant tree.
We learned of the various forms of simple folds, laminate gills, spines or complex pores from which the spores were released. The most minute deviation from the vertical would mean spores hit the sticky sides of the gills and not get released.
Red Admiral butterflies were also in abundance, we saw them feeding on fallen, fermenting apples and becoming intoxicated and less cautious as a result. The afternoon ended with an inspection of the massed collection of the two dozen foragers. Fungi are so varied and so complex that we may well have found new species for the site.
Professor John Solbé MBE CBiol FSB
11 May 2013
Near Porthmadog in North Wales lies a rather unusual (and potentially exciting) nature reserve: an abandoned site of nitroglycerine manufacture. The process involved mixing glycol plus nitric acid and sulphuric acid with glycerine (carefully). For safety reasons the site occupied a wide area (28ha) with its three valleys each carrying out a distinct process. Woodland provided some degree of insulation from explosions as did using buildings whose roofs were designed to blow off in the event of problems. In the early days, mixing was done manually and the temperature was crucial; too cool and the reaction did not occur, too warm and it exploded. The worker whose job it was to stir and maintain the temperature was provided with a one-legged stool so if he nodded off he also fell off and woke in time to monitor the reaction!
The site opened in 1865 and was completely destroyed by a massive explosion in 1915. After serving the armaments industry in both World Wars (5,000 tonnes of military explosive and 17 million grenades safely made in WWII) the factory continued to operate making very effective and safe detonators for the mining industry until 1995. Since then (and a cleansing process using fire to mop up any remaining explosive contamination) the site has been left almost in peace having been handed over to the North Wales Wildlife Trust in 1998. It now offers a haven for wildlife such as nightjars, lesser horseshoe bats and a large number of moth species.
On a wet and windy morning in May ten members and friends of the North Wales branch explored the site under the guidance of Mike Willis (whose most important instruction was not to touch anything that might explode)! To the contrasting calls of cuckoos, willow warblers and ravens we climbed up through sessile oaks, birches and willows with native bluebells and wild strawberries underfoot, past ponds for cooling and for purifying the products and derelict buildings including safety shelters, now inhabited by bats, to the nightjar territory of mixed heathland. Up on this height there were extensive views all round and the impressive sight of a two tonne ballistic pendulum, into whose maw was positioned a cannon loaded with a test charge of explosive. The distance the pendulum swung when the cannon was fired gave a measurement of the strength of the batch tested.
Our discussions of the natural history and ecology were concluded in warmer conditions over a pub lunch.
Professor John Solbé MBE CBiol FSB