Lilies provide gloriously beautiful and well scented flowering border plants. Choose flowering size bulbs in the garden centre or from a catalogue. Grow these through the winter potted in a general garden compost placed in an unheated greenhouse or cold frame. By March or early-April, substantial green shoots will have formed from the bulbs and they can be transplanted into the garden.
Lilies need a sunny border and very fertile soil to encourage vigorous root growth capable of supporting the flowering spike and ancillary bulbs as they are initiated. This produces magnificent flowers and an increasing colony of bulbs that will spread and become established over future seasons.
Lilium longiflorum, often called the Easter lily | Image credit: Professor Geoff Dixon.
Regular watering and feeding with nutrients are needed, especially potassium, which encourages root and shoot growth. Stake the flower spike as it grows, giving support for the flowers because they are heavy when fully open and easily damaged by winds.
Rewards come in mid-summer with magnificent colourful flowers and wonderful perfumes on warm evenings. Apart from severe winters, lilies are hardy garden plants unless they are from groups specified as tender and requiring protection. In the autumn, simply cut down the flowering spike and remove any fallen foliage.
Buds developed on lily scales after culturing | Image credit: Professor Geoff Dixon.
The Lilium genus has about 100 species originating worldwide mainly from north temperate areas of Europe, Asia and America. The colour range includes white, yellow, orange, pink, red and purple. Plant breeders in The Netherlands, Japan and North America have produced a huge range of multi-coloured hybrids.
Taxonomically, Lilium is divided into divisions, of which the Turk’s Caps, Martagons and American hybrids are popular. The most destructive pest is the scarlet lily beetle (Lilioceris lilii) which devours foliage, flowers and bulbs. The first signs of trouble are shot holes in the foliage. Picking off beetles and larvae is an effective means of dealing with low-level infestations.
Comparison of lily bulbils growing from scale leaves, immature bulb and flowering size bulb | Image credit: Professor Geoff Dixon.
Asexual propagation is a simple and enjoyable occupation. Divide a good-sized bulb into its scales. Choose healthy scales from the outer rings and place these in a plastic box containing damp kitchen paper and place in an airing cupboard. After about 10-12 weeks, small bulbils will have formed on each scale.
Select the boldest mother scales and bulbils and plant in a tray of seedling compost and grow in the greenhouse. After two or three months the most vigorous young plants can be potted individually. Eventually these are planted in the garden and will develop into flowering size bulbs after two or three years.
Written by Professor Geoff Dixon, author of Garden practices and their science, published by Routledge 2019.
The War on Plastic is a grand title. To most of us, it doesn’t seem like much of a war at all – more like a series of skirmishes. Nevertheless, if you look closely, you’ll see that a lot of companies are tackling the issue.
GSK Consumer Healthcare (GSKCH) is one such organisation. The healthcare brand that gave us Sensodyne and Advil has launched a carbon neutral toothbrush to reduce our reliance on fossil fuels (which create virgin plastic).
The composition of its Dr. Best tooth scrubber is interesting. The handle comprises a mixture of a cellulose derived from pine, spruce, and birch trees and tall oil, which comes from the wood pulping industry. The bristles are made from castor oil and the plastic-free packaging includes a cellulose window.
According to GSKCH, Dr. Best is Germany’s favourite toothbrush brand and there are plans to apply the technology to toothbrushes across its portfolio, including its Sensodyne brand. At the moment, GSK needs to apply carbon offsetting initiatives to make the toothbrush carbon neutral, but it says it is working on future solutions that do not require this approach.
GSK isn’t the only company that is actively reducing the use of plastics and minimising waste. Supermarket chain Morrisons has made aggressive moves in recent years to cut waste, and has just launched six ‘net zero waste’ stores in Edinburgh that will operate with zero waste by 2025.
Customers at these stores will be able to bring back hard-to-recycle plastics such as food wrappers, foils, yoghurt tubs, mixed material crisp tubes, coffee tubs, batteries, and plant pots. At the same time, all store waste will be collected by a range of specialist waste partners for recycling within the UK, and unsold food will be offered to customers at a cheaper price on the Too Good to Go app.
Morrisons’ proactive approach will help find a new life for hard-to-recycle packaging.
‘We’re not going to reach our ambitious targets through incremental improvements alone,’ said Jamie Winter, Sustainability Procurement Director at Morrisons. ‘Sometimes you need to take giant steps and we believe that waste is one of those areas. We believe that we can, at a stroke, enable these trial stores to move from recycling around 27% of their general waste to over 84% and with a clear line of sight to 100%.
‘We all need to see waste as a resource to be repurposed and reused. The technology, creativity and will exists – it’s a question of harnessing the right process for the right type of waste and executing it well.’
If this approach is successful, Morrisons plans to roll out the zero waste store format in all of its 498 stores across the UK next year.
>> Interested in reading more about sustainability and the environment? Check out our blog archive.
The government has also issued its latest battle cry in the war on plastics. Having defeated plastic straws, stirrers and cotton buds, it has turned its attention to other single-use plastics.
Single-use plastic plates, cutlery and polystyrene cups are among the items that could be banned in England following public consultation.
The humble cotton bud has now been retired from active service.
Somewhat surprisingly, it estimates that each person in England uses 18 single-use plastic plates and 37 single-use plastic items of cutlery each year; so, it has begun moves to cut out this waste stream.
Environment Secretary George Eustice said: “We have made progress to turn the tide on plastic, banning the supply of plastic straws, stirrers and cotton buds, while our carrier bag charge has cut sales by 95% in the main supermarkets. Now we are looking to go a step further as we build back greener.”
All in all, it’s encouraging to see that companies and the government are brushing up on their sustainable practices.
>> Curious to find out what the future looks like for lab-processed food and meat alternatives? Read what the experts say here.
Life is busy for Rhys Archer. Outside of her work as EPSRC Doctoral Prize Fellow in Biomedical Materials at the University of Manchester, she founded Women of Science to share stories about real women working in science. She has championed STEM in schools in her spare time and received the Robert Perrin Medal from the Institute of Materials, Minerals, and Mining – all before her 30th birthday.
Rhys is also refreshingly forthright in her views. She took the time to speak to us about everything from attitudes towards disability in academia, the problem with STEM statistics, and finding that sense of belonging in science.
Would you mind telling me about your work at the University of Manchester and the research areas that interest you most?
My research interests have always been interdisciplinary – I am a bit of a magpie when it comes to research and I get excited by projects in different areas. Luckily, being a researcher in materials science means that I can apply my knowledge and skills in a wide array of areas and industries. I have recently finished my doctoral studies looking at how carbon fibre composites are damaged during impacts, and how to toughen them while keeping composites light weight, which is particularly useful in the aerospace industry. However, I have since moved over to research in biomedical materials, specifically within tissue engineering, where I am researching biocompatible composite scaffolds for tissue regeneration.
You set up Women of Science in 2016 to share stories about real people in science. How has this been?
When I set up Women of Science, I first looked at it as a personal project that could be of use in schools to young people. However, it became apparent fairly quickly that access to relatable role-models in STEM was needed, not just in schools but also for women across the STEM industry.
Since then, we have been fortunate to be awarded funding to grow the work we do and expand our audiences. One of the most important actions I have taken with Women of Science is to set up an advisory board (which includes a diverse range of women) to share ideas and to influence the direction and activities of Women of Science.
As well as the impact on others, Women of Science has had a huge impact on me personally. When I set up Women of Science I was going through a difficult period of feeling isolated, and found it difficult to feel a sense of belonging in science and in research. By reaching out and hearing other women’s stories – not just their achievements, but also their doubts, worries, and difficulties – I found that I did belong in STEM. I just had to search for it.
Would you mind sharing some of the successes and challenges you’ve experienced in your own career?
At 29, towards the end of my PhD, I was diagnosed as autistic. Looking back, I can see that the challenges I faced, particularly because of depression, anxiety, and isolation, were due to my needs not being considered or met. Being disabled in academia is an ongoing challenge. It is still a fight to gain equitable working arrangements, opportunities, and acceptance.
However, I can also see how the successes I have had, such as setting up Women of Science, and being a part of other projects are a result of ‘being different’. My strongest quality is a diversity of perspective and experience and an eagerness to be a part of a range of different projects.
>> We’re keen to hear diverse perspectives from people working in the chemical industry. Get in touch with us at: firstname.lastname@example.org
You have championed inclusivity in STEM. Do you think academic institutions and other workplaces could be more inclusive?
Yes. I think there is a huge amount of awareness and conversation about inclusivity in academia and industry, but not nearly as much action and intervention. Often I see workplaces with inclusive policies, but with little consideration of monitoring, evaluating, or reconsidering those policies. We must move past equity, diversity, and inclusivity being a checkbox exercise. The issues faced by women in the workplace are intersectional and complex, and so require well considered, complex solutions.
According to WISE, women now make up 24% of the STEM workforce in the UK. It estimates that this number could rise to 29% by 2030. What do you think about these figures?
While the number of women in STEM is a common metric when considering equality, this does not accurately portray issues surrounding inclusion and belonging. How are women treated? Do they have the opportunity to advance? Are there equitable policies and measures in place? This is particularly true of women in STEM who identify with other protected characteristics around race, disability, sexual orientation, and class. Once you dig into the statistics (where available) further, it is clear that the numbers given are not sufficient to describe the current situation for all women in STEM.
Also, the ‘leaky pipeline’ model is often considered, that is, that the number of women in STEM fall as we follow the statistics from school, to university, and onto the workplace. However, what is not always considered is that, as with a leaky pipeline, when more women are added, rather than ‘fixing’ the pipeline, the cracks become more obvious. Eventually, we reach a point when the pipeline is fractured. We must focus on repairing these cracks, not just increasing a numerical metric.
Additionally, in this current climate, it is incredibly difficult to make predictions as to what the future holds for the number of women in the STEM workforce. A couple of years ago, we could not foresee the impact that a global pandemic would have on women. When we consider the possible effects of climate change over the next decade, can we predict the burden that will be placed on women, or how this will affect women’s choices?
What’s next for you? Are you involved in any exciting projects?
With Women of Science, we have three projects that will be launched towards the end of the year, including a new website, flashcard activities for young people, and a report on the impact of the pandemic on women in STEM. Further ahead, I would love to expand the reach of Women of Science further, working with podcasting and film, as well as reaching out to policy makers. Personally, I am excited to get my teeth stuck into a new research project and see where that leads, as well as doing more teaching, consulting, and any other opportunities that come my way!
>> Are you interested in getting involved in Women of Science? Visit: www.womenofsci.com
A little talked about element, with the atomic mass 140, plays a surprisingly important role in everyday life. It has not only lit many a path, but can be credited with improving and saving the lives of billions of people by enabling cleaner air.
In his talk '140Ce: White light & Clean Air' Andy Walker, Johnson Matthey’s Technical Marketing Director explained why the soft, ductile silvery-white metal Cerium, deserves more recognition.
Walker began by outlining the history of SCI, celebrating its 140th anniversary this year. As an employee of Johnson Matthey, Walker highlighted that George Matthey was among the pioneers of SCI. In addition Walker explained that his PhD research had involved looking at catalysts that included Cerium.
Cerium is a lanthanide and the 26th most abundant element on earth. Indeed it was the first lanthanide to be discovered, found as its ore cerium silicate, in 1803. Cerium makes up 66ppm of the earth’s crust, which is about 5 times as much as lead. It is the only one of the lanthanides able to take on the +4 oxidation state, making it very useful in some of its applications. It is mined in the US, Brazil, India, Sri Lanka, Australian and China, with annual global production of 24 000 tonnes.
However, this straightforward look at the history of Cerium conceals a much more interesting narrative about how this element shaped the life of a number of prominent chemists of the day. Indeed Cerium was found as early as 1751 at a mine in Vestmanland, Sweden by Axel Cronstedt, who also discovered Nickel. Believing it to be an ore of Tungsten, he sent it to Carl Wilhelm Scheele for analysis. However, Scheele was not able to identify it as a new element.
This turn of events for Scheele, perhaps unfairly, helped to seal his moniker as the ‘unlucky chemist’. Scheele, a prominent chemist and pharmacist, had a number of discoveries to his name. He isolated lactic acid, and discovered hydrogen fluoride and hydrogen sulphide.
But as Walker explained, his most notable discovery was oxygen, some three years before Joseph Priestley. Sadly for Scheele; it took him six years to publish his findings, by which time Priestley had already presented his data. Putting a contemporary slant on Scheele’s misfortune, Walker added that the cautionary tale here was that getting things out into the public domain as soon as possible can be important to ensure credit goes to the right people.
Further work by Scheele led to the discovery of a number of elements including barium and chlorine, but sadly he did not receive any recognition because he didn’t manage to isolate them and identify them correctly. The chemist Sir Humphrey Davy did so, some years later, getting the credit for their discovery and isolation.
So it was in 1803 that chemists Wilhelm Hisinger and Jons Jacob Bezelius proved that Cerium was indeed a new element, naming it Cerium after an asteroid/dwarf planet which had been called Ceres. The successful isolation of Cerium took place in 1875, carried out by American chemists William Hillebrand and Thomas Norton, by passing an electric current through molten cerium chloride.
99.95% fine cerium isolated on white background
Once isolated, the earliest application of Cerium was in incandescent gas mantles. Developed by Carl Auer von Welsbach, in 1891, he perfected a mixture of 99% thorium oxide and 1% ceria, which gave a soft white light. Introducing his new mantle commercially in 1892, von Welsbach was able to monetise his development selling his product throughout Europe.
Gas mantles have been replaced, but Cerium’s importance in producing white light remains. As Walker explained, most white LEDs use a blue gallium nitride LED covered by a yellowish phosphor coating made of cerium-doped Yttrium Aluminium Garnet crystals.
In the medical arena, Cerium was used by Sir James Young Simpson, Professor of Medicine and Midwifery at Edinburgh who did a lot of work in the area of anaesthetics. Simpson found that cerium nitrate suppressed vomiting, particularly that associated with morning sickness, and well into the last century, medication containing Cerium could be bought over the counter. In addition Cerium has been the basis of treatments for burns.
Other applications for this versatile element are self cleaning ovens and mischmetal alloy, used in flints for cigarette lighters. Walker shared that the chemist and author Primo Levi, while imprisoned in Auschwitz, was able to steal cerium-iron rods from the laboratory he was forced to work in. Making them into cigarette lighter flints, he was able to barter for bread. Cerium is used to harden surfaces; it is a good polishing agent. Cerium sulphide has been used to replace the pigment cadmium red as a non-toxic alternative and Cerium is widely used across the chemical industry as a catalyst to produce a host of chemicals.
Catalysis is probably where Cerium has impacted most people as the element is the basis for the catalytic converters that have provided cleaner air for billions of people. Walker explained that the driver for the development came during the 1950s when photochemical smog was a problem in the Los Angeles Basin. Measurements at the time indicated that vehicles were responsible for the majority of the hydrocarbon and NOx emissions that led to the polluted air.
This turn of events led researchers to develop systems that could mitigate the emissions. Johnson Matthey was among those doing the early work on catalytic converters. Meanwhile, the automotive industry was pushing back on their introduction, concerned about the costs, durability and effectiveness. Working with Ricardo Engineering, Johnson Matthey carried out durability tests over 25 000 miles which also showed that the catalysts could pass US emissions tests.
The catalysts had to operate in three ways, at the same time, oxidising carbon monoxide (CO) and hydrocarbons (HC) while reducing NOx. Early catalysts, circa 1975, were based on Palladium and Platinum and focused on oxidising the CO and HC. Around 1978 a second catalyst was introduced to reduce NOx.
However, the introduction of Cerium then made it possible to develop a single catalyst that was able to carry out the functions that the researchers had wanted to achieve. Hence, 1981 saw the introduction of the three way catalytic converter with all three reactions enabled over a single catalyst. More recently ceria-zirconia oxide based catalysts have been developed with much higher oxygen storage capacity than ceria.
The impact of these developments has allowed the implementation of much more stringent air quality and emissions standards. Indeed Johnson Matthey estimates that its Cerium-based catalysts are responsible for removing around 40 tonnes of pollutants every minute of every day.
A single element has indeed impacted many lives.
Antimicrobial resistance (AMR), now referred to as the silent pandemic, is causing governments, regulatory and health bodies to make a lot of noise.
Issuing a statement in late August 2021, the Global Leaders Group on Antimicrobial Resistance called on countries to ‘significantly reduce the levels of antimicrobial drugs used in global food systems’. The Global Leaders Group on Antimicrobial Resistance includes heads of state, government ministers and leaders from the private sector and civil society. It was established during 2020 to accelerate global political momentum, leadership and action AMR.
Co-chaired by Mia Amor Mottley, Prime Minister of Barbados and Sheikh Hasina, Prime Minister of Bangladesh, the Group is calling for all countries to take action to tackle the issue. Steps include: Ending the use of antimicrobial drugs that are of critical importance to human medicine to promote growth in animals, eliminating or significantly reducing over-the-counter-sales of antimicrobial drugs that are important for medical of veterinary purposes, and reducing the overall need for antimicrobial drugs by improving infection prevention and control, hygiene, bio security and vaccination programmes in agriculture and aquaculture.
Leaders are calling for the reduction in the use of antimicrobial drugs.
Speaking at the second meeting of the Global Leaders Group on Antimicrobial Resistance, Inger Andersen, Under-Secretary-General of the United Nations and Executive Director the United Nations Environment Programme said: ‘Already 700 000 people die each year of resistant infections. There are also serious financial consequences: in the EU alone, AMR costs an estimated €1.5 billion per year in health care and productivity costs…’ But Andersen added that now was an opportune moment to make change. ‘With concern over zoonotic diseases at an all-time high, governments can take advantage of the synergies available from tackling emerging disease threats concurrently. The Global Leaders Group has strategic access to forums to promote AMR integration in post-covid-19 plans and financing…It’s time to for us to act on the science and respond rapidly to AMR,’ Andersen said.
The Communiqué from the G7 Health Ministers’ Meeting held in Oxford, UK during June also gave significant space the AMR issue and the link with the pandemic. ‘We reiterate the need for ongoing education and reinforced stewardship of the use of antimicrobials, including avoiding their use where there is no science-based evidence of effectiveness. The pandemic has also highlighted the importance of infection prevention and control measures to tackle AMR, targeting both health-care associated and community-associated infections.’ Adding a sense of urgency the Communiqué continued: ‘We must act strongly and across disciplines if we are to curb the silent pandemic of antimicrobial resistance.’
A letter from the BactiVac Bacterial Vaccinology Network reminded the G7 Health Ministers that the 2016 O’Neill Report estimated that by 2050, 10 million lives each year and a cumulative US$100 trillion of economic output will be at risk due to increasing AMR unless proactive solution are developed now. In its letter to the G7, the Network issued this warning. ‘The headlines on AMR may have less immediate impact, but the news is no less stark. Over the long-term, AMR bacteria will cause more prolonged suffering than covid-19, with a more insidious impact on all our lives.’ Signatories to the letter included Professor Calman MacLennan, Senior Clinical Fellow and Group Leader, Jenner Institute, University of Oxford, Professor of Vaccine Immunology, University of Birmingham.
Researchers are collaborating to understand how AMR is impacted by a range of factors
The G7 also stressed the need for collaborative efforts for a better understanding of how AMR is impacted by a range of factors. Taking up this challenge; several initiatives has been put in place to study this. Most recently the United Nations Environment Programme and the Indian Council of Medical Research have launched a project looking at ‘Priorities for the Environmental Dimension of Antimicrobial Resistance in India.’ The project aims to strengthen the environmental aspects of national and state-level AMR strategies and action plans. In a similar development the European Food Safety Agency published an assessment of the role played by food production and its environment in the emergence and spread of antimicrobial resistance. Publishing the findings in the EFSA journal, the report indicated that fertilisers of faecal origin, irrigation and water are the most significant sources of AMR in plant-based food production and aquaculture.
Meanwhile, the first quarter of 2021 saw Ineos donate £100 million to the University of Oxford to establish a new antimicrobials research facility. The Ineos Oxford Institute for Antimicrobial Resistance aims to create collaborative and cross disciplinary links involving the university’s department of chemistry and department of zoology. The Institute also intends to partner with other global leaders in the field of AMR.
Partnering with India, the UK has committed £4 million to the AMR fight. With a total investment of £8 million, the partners have established five joint research projects which aim to develop a better understanding of how waste from antimicrobial manufacturing could be inadvertently fuelling AMR.