Advances on the production of polyhydroxyalkanoates (PHA) by mixed microbial cultures from sugar cane molasses

Dissertação para obtenção do Grau de Mestre em Biotecnologia

Enrichment of a PHA producing microbial community in a continuous bioreactor setup

Polyhydroxyalkanoates (PHAs) are biosynthetic polyesters, biodegradable and biocompatible making them of great interest for industrial purposes. The use of low value substrates with mixed microbial communities (MMC) is a strategy currently used to decrease the elevated PHA production costs. PHA production process requires an important step for selection and enrichment of PHA-storing microorganisms which is usually carried out in a Sequencing Batch Reactor (SBR). The aim of this study was to optimize the PHA accumulating culture selection stage using a 2-stage Continuous Stirrer Tank Reactor (CSTR) system. The system was composed by two separate feast and famine bioreactors operated continuously, mimicking the feast and famine phases in a SBR system. Acetate was used as carbon source and biomass seed was highly enriched in Plasticicumulans acidivorans obtained from activated sludge. The system was operated under two different sets of conditions (setup 1 and 2), maintaining a system total retention time of 12 hours and an OLR of 2.25 Cmmol/L.h-1. An average PHB-content of 3.3 % wt was obtained in setup 1 and 4.8% wt in setup 2. Several other experiments were performed in order to better understand the continuous system behaviour, using biomass from the continuous system. With the fed-batch experiment a maximum of 8.1% PHB was stored and the maximum substrate uptake and specific growth rates obtained in the growth experiment (1.15 Cmol Cmol-1.h-1 and 0.53 Cmol Cmol-1.h-1) were close to the ones from continuous system (1.12 Cmol Cmol-1.h-1 and 0.59 Cmol Cmol-1.h-1). The microbial community was characterized trough microscopic visualization, Denaturing Gradient Gel Electrophoresis (DGGE) analysis and Fluorescent in situ hybridization (FISH). The last studied performed mimicked the continuous system by building up a SBR system with all the same operational conditions while adding an extra acetate dosage during the 12 h cycle, simulating the substrate passing from the feast to the famine reactors under continuous operation. It was shown that possibly the continuous system was not able to efficiently select for PHB storing organisms under the operational conditions imposed, although the selected culture was capable of consuming the substrate and grow fast. This main conclusion might have resulted from two major factors affecting the system performance: the ammonium concentration in the Feast reactor and the amount of substrate leaching from the Feast to the Famine reactor.

Effects of residues on the degradation of PHA produced from mixed microbial cultures and processed in extrusion

Thermal degradation upon melting is one of the major drawbacks reported for polyhydroxyalkanoates (PHA). However, the role of residues originating from the fermentation and the extraction steps on the thermal stability of this class of biopolymers still needs to be clarified. In the particular case of PHA produced from mixed microbial cultures (MMC), this topic is even less documented in the literature. Here, two polyhydroxy(butyrate-co-valerate) (PHBV) produced from MMC enriched in PHA accumulating organisms and fed with cheese whey were studied. A micro extrusion line is used to produce filaments and assess the processability and the degradation of processed PHBV. The prototype micro extrusion line allows for studying grams of materials. The two PHBV contain 18 mol% HV. PHBV was recovered with 11 wt% residues, and further submitted to a purification procedure resulting in a second biopolyester containing less than 2 wt% impurities. The thermorheological characterization of the two PHBV is first presented, together with their semicrystalline properties. Then the processing windows of the two biopolyesters are presented. Finally, the properties of extruded filaments are reported and the thermomechanical degradation of PHBV is extensively studied. The structure was assessed by wide angle X-ray diffraction, mechanical and rheological properties are reported, thermal properties are studied with differential scanning calorimetry and thermogravimetric analysis, whereas Fourier Transform Infrared spectroscopy was used to assess the impact of the extrusion on PHBV chemical structure. All results obtained with the two PHBV are compared to assess the effects of residues on both PHBV processability and degradation.

PHA corporate plan 2009-2010

This report explains the purpose of the PHA, its vision for public health and wellbeing, and the values that underpins its work.

PHA/HSCB Hidden Harm Action Plan

This joint PHA/HSCB Hidden Harm Action Plan - Responding to the needs of children born to and living with parental alcohol and drug misuse in Northern Ireland, has been prepared for the DHSSPS in response to the PfA target on Hidden Harm. The plan was approved by DHSSPS in October 2009.

PHA annual report 2009-2010

The Public Health Agency Annual report 2009–2010 report provides background information about the PHA, highlights the achievements during the2009–2010 financial year and provides an overview of work undertaken in priority areas for each directorate within the organisation. The summary financial accounts are presented in the operating and financial review section of the report and members of the PHA board are detailed within the report also.

PHA supports World No Tobacco Day

The Public Health Agency is taking the opportunity to highlight this year's World No Tobacco Day which takes place on Tuesday 31 May.In Northern Ireland, around 340,000 people aged 16 and over smoke. Smoking contributes not only to many cancers, heart disease, bronchitis and asthma, but to other illnesses, including stroke. In fact, smoking causes around 2,700 deaths per year here, all of them avoidable.The PHA is committed to saving lives by reducing the percentage of people who smoke. The PHA:works with councils to ensure smoking-related laws are enforced; funds a range of support to smokers who want to quit; educates young people to not start smoking, through programmes like 'Teenage Kicks' and 'Smokebusters'. In January this year, the PHA also launched its smoking campaign 'Things to do before you die' to encourage smokers, particularly those aged 20-49, to stop smoking.Health Minister Edwin Poots said:"Smoking is the greatest cause of preventable illness and premature death in Northern Ireland. While good progress has been made in the last number of years to reduce the number of people who smoke, more needs to be done."I would appeal to all smokers to use the wide range of support services available to make every effort to stop smoking - it is the single best step you can take to improve your health and quality of life."Mark Mc Bride, Health Improvement Manager, PHA, said "Smoking is the single greatest preventable cause of death in the world today. Across Northern Ireland there are over 600 support services for people who wish to stop smoking. These are based in GP surgeries, community pharmacies, hospitals, community centres and workplaces."From April 2010 to end March 2011 more than 1 in 10 of all adult smokers sought help from the support services and approximately half had quit after four weeks. This is a substantial - roughly 50% increase - on previous years and shows the benefit of the PHA campaigns and the dedication of the many specialists who help smokers quit."I would encourage everyone who is either thinking about quitting or ready to log on to our Want 2 Stop website www.want2stop.info or to contacting the Smokers' Helpline on 0808 812 8008 a Quit Kit free of charge."

PHA - improving cardiovascular services

?The Public Health Agency has identified ways of delivering cardiovascular services that will help to tackle health inequalities. These are described in a new "health impact assessment" report, launched on 1 June at the Maureen Sheehan Centre, Belfast.The PHA, in partnership with a wide variety of community, voluntary and statutory bodies, leads the work to improve cardiovascular health and wellbeing, through better prevention and treatment services, delivered through a 'cardiovascular service framework'. The result of a wide consultation, this new report will help to improve the way those services are delivered by focusing on the needs of disadvantaged people.Explaining the importance of this work, Dr Adrian Mairs, Consultant in Public Health Medicine, PHA, said: "The Public Health Agency was set up to tackle health inequalities and promote better health and wellbeing across Northern Ireland. Despite many improvements in prevention and treatment, cardiovascular diseases remain the main cause of death in Northern Ireland. We know that these diseases, including heart disease, stroke, circulation problems, diabetes and renal disease have a greater and more severe impact on people living in poverty. "This work will help us to reduce the health inequalities that exist in our society by improving the way cardiovascular services are developed and delivered, eg ensuring stop smoking services meet local needs, identifying and treating high blood pressure, and helping people to take their medicines properly."The health impact assessment has been developed from other work, including a literature review, cardiovascular health and wellbeing profile, and full technical report. All of these resources are available on the PHA website, under 'Directorates', 'Service Development and Screening'. The work will also be used to help the development of service frameworks covering other disease areas. Putting a health inequalities focus on Northern Ireland cardiovascular service framework - Summary report: www.publichealth.hscni.net/publications/putting-health-inequalities-focu... health and wellbeing profile for Northern Ireland: www.publichealth.hscni.net/publications/cardiovascular-health-and-wellbe... health and wellbeing in Northern Ireland - Literature review: www.publichealth.hscni.net/publications/cardiovascular-health-and-wellbe... focus (newsletter): www.publichealth.hscni.net/publications/hia-focus

PHA advises 'breast is best'!

The Public Health Agency is using National Breastfeeding Awareness Week (NBAW) to emphasise the message that breastfeeding is the healthiest option for both you and your baby and that by deciding to breastfeed, you will be giving your child the best possible start in life. NBAW runs from 19-25 June and highlights the fact that any period of breastfeeding, however short, will benefit your baby.Breast milk is different to formula milk as it contains antibodies that cannot be manufactured in formula. Antibodies help protect babies from infection and stimulate their immune system.Northern Ireland has the lowest breastfeeding rate in the UK, with an average of 63% of women breastfeeding their baby at birth. Janet Calvert, Regional Breastfeeding Coordinator at the PHA, said: "This is an issue that clearly needs addressed, as breastfeeding has many important health benefits for both mother and baby. These include a reduced risk of ear, chest, kidney and stomach infections and less risk of childhood diabetes and obesity."Breastfeeding can also significantly reduce the risk of hospital admission of children for gastroenteritis and chest infections. The health benefits for mothers who choose to breastfeed include a reduced risk of developing illnesses such as breast cancer, ovarian cancer and osteoporosis."There are other benefits as well as those to your health. Breastfeeding is free - you don't have to buy formula, bottles, teats, sterilising equipment etc. Breast milk is always available, with the right ingredients, at the right temperature, so it's easier to feed at night or on the go.The PHA recognises the importance of breastfeeding to health and the need to ensure that mothers get off to a good start with breastfeeding. It is vital that mothers get the right support and encouragement from their family and friends should they decide to breastfeed. Breastfeeding can be difficult at the start and mothers need reassurance while they learn."There are many local initiatives in the community to improve breastfeeding support. These include improving support in the health service and through Sure Start programmes, which work in areas of need to help ensure children get the best start in life," Janet added."Mother to mother peer support programmes are in place in many areas and are working with expectant and new mothers to help them breastfeed for longer. There are also 70 breastfeeding support groups, which provide ongoing support for breastfeeding mothers throughout Northern Ireland. "The PHA is also working to improve attitudes to breastfeeding in public through the Breastfeeding Welcome Here scheme, which began in 2005 and now has over 200 businesses and public facilities signed up to support and welcome breastfeeding families. All these initiatives, along with support from partners and family, are vital to help expectant and new mothers stay with breastfeeding."Health Minister Edwin Poots said: "There is clear evidence that breastfeeding offers health benefits for both babies and mothers. We know that breast milk gives baby the best start in life by providing all the nutrients and protection a baby needs for the first six months of life. That is why my Department is committed to promoting and supporting breastfeeding".For further information on breastfeeding visit www.breastfedbabies.org.uk

PHA urges 'freshers' to be smart and know their alcohol limits

As 'fresher's week' commences, the Public Health Agency is encouraging students across Northern Ireland to avoid binge drinking and to know their limits if they do choose to drink alcohol.Enjoying new freedoms, at college or university, means taking care of yourself and others and, if you choose to drink, staying within safe alcohol limits. Owen O'Neill, PHA Health and Social Wellbeing Improvement Manager for drugs and alcohol, said: "Some young people may drink more when they leave home, or join their friends in college or university for the first time. They might think that, as young people, they don't have to take care with alcohol, but staying within the safe drinking limits is important for everyone who drinks. Excessive and binge drinking can have lasting effects on health, such as damage to the liver, heart, brain and stomach. Drinking too much can also increase the risk of accidents and antisocial behaviour as well as sexually transmitted infections and unplanned pregnancy"."We would also strongly advise against drinking games. Although they are regarded as a 'bit of fun', in reality they can be very dangerous. As an extreme form of binge drinking, where large quantities of alcohol are consumed in a very short time, drinking games can result in alcohol poisoning, leading to brain damage, coma or death. The PHA encourages students to enjoy their new student life, but urges them to be aware of their alcohol intake and drink responsibly, especially throughout fresher's week, with the many cheap drink promotions currently available."Daily alcohol limits are recommended by the government in order to avoid the risks of excessive and binge drinking in any one session. These are:Men: No more than 3 to 4 units of alcohol a day and no more than 21 units over the course of the week.Women: No more than 2 to 3 units of alcohol a day and no more than 14 units over the course of the week.Examples of units:Can of extra strong lager - 4 unitsBottle of lager - 1.5 unitsPint of standard lager - 2.5 unitsPint of premium larger - 3 unitsSmall pub bottle of wine - 2.25 units70cl bottle of wine - 7 to 10 unitsStandard 275ml of alcopops - 1.5 to 1.8 units70cl bottle of alcopops - 3.75 to 4.5 unitsPub measure of spirits - 1.5 unitsPint of cider - 3 unitsPint of stout - 2.5 unitsIf you do choose to drink alcohol:DON'T:Ever drink and driveDrink on an empty stomachMix alcohol with other drugsDrink in rounds as this may speed up your drinkingLeave your drinks unattendedDO:Take sips rather than gulpsAlternate each alcoholic drink with a non alcoholic drink e.g. water or a soft drinkSet yourself a limit and try to stick to it (refer to daily alcohol limits) Take frequent breaks from drinking to give your body time to recoverTell friends and family where you are going and who you will be withRemember, that for each unit you drink over the daily limit, the risk to your health increases. It's important to spread the units throughout the week - you can't 'save up' your units for the weekend or your holiday. It is also important to drink plenty of water, ideally matching the amount of alcohol you have consumed.So students make smart choices this term - drink sensibly and know your limits!For further information on sensible drinking and alcohol units visit the Public Health Agency's website www.knowyourlimits.info

PHA supports World Hospice and Palliative Care Day

Saturday 8 October 2011 marks World Hospice and Palliative Care Day. The Public Health Agency would like to celebrate and support hospice and palliative care around the world by raising awareness and understanding of the needs - medical, social, practical and spiritual - of people living with a life-limiting illness, and their families.This year's World Hospice and Palliative Care Day theme is 'Many diseases, manylives, many voices - palliative care fornon-communicableconditions'.The theme will focus on how people living with conditions thatare notinfectious can benefit from palliative care.Non-communicable diseases (NCDs), which include cardiovascular diseases, cancers, chronic respiratory conditions and diabetes, make up60% of deaths worldwide. The majority of thesedeaths occur in low and middle income countries, where palliative care is often not available. To get involved in World Hospice and Palliative Care Day, log on to www.worldday.org/get-involved/ which gives you ideas and suggestions on what you can do on the day to support people living with life-limiting illnesses, and their families.Mary Hinds, Director of Nursing and Allied Health Professions, PHA, and Chair of the Implementation Process for End of Life Care in Northern Ireland, said: "Good quality palliative and end of life care will be important for us all. 'Living Matters, Dying Matters' is a five year strategy for palliative and end of life care in Northern Ireland, established to ensure that any person living with a life-threatening illness lives well and dies well, irrespective of their condition or care setting. "It has been encouraging to see the plans being taken forward by the Health and Social Care Trusts in partnership with local hospices and other providers, and involving local people."We aim to ensure that people receiving palliative care, their families and carers, are provided with high quality care across all settings and conditions, and are supported to enjoy a good quality of life, maximising their potential through the course of their illness."There is still some progress to be made within the context of the review of health and social services. We are looking for statutory and voluntary services to work together to make a significant difference in improving access to high quality services for those with life-limiting conditions, and to develop innovative approaches to care."

PHA urges parents to get 'at risk' children vaccinated against seasonal flu

The Public Health Agency is urging Northern Ireland parents to make sure children in 'at risk' groups get their flu vaccine early.The message has been issued to parents and carers of children as the PHA's seasonal flu vaccination programme gets underway for 2011/12.It is very important that children with any condition that puts them more at risk of the complications of flu get the vaccine.These 'at risk' conditions include:chronic lung conditions such as asthma;chest infections that have required hospital admission;chronic heart conditions;chronic liver disease;chronic kidney disease;diabetes;lowered immunity due to disease or treatment such as steroids or cancer therapy;chronic neurological conditions such as stroke, multiple sclerosis or a condition that affects the nervous system, such as cerebral palsy;hereditary and degenerative diseases of the central nervous system or muscles.Children who attend special schools for severe learning or physical disabilities are considered to be particularly at risk, as well as those with other complex health needs.The PHA has written to principals of local special schools, as well as parents of children at these schools, to raise awareness of the importance of getting vaccinated early.Dr Richard Smithson, PHA Flu Vaccination Lead, said: "For many people, flu is a short, unpleasant illness, but it does not usually cause any serious problems. However, for others, it can have very serious complications including, in rare cases, being fatal."We have been particularly reminded over the last two winters that children with chronic neurological problems and other complex health needs are very vulnerable to these complications. We have seen children become very seriously ill and, tragically, there have even been a few deaths in children who attend special schools."For this reason, we recommend that all children who attend special schools for severe learning disability, and special schools for physical disability, are offered the flu vaccine early in the autumn, before the flu viruses start circulating."The vaccine is now available from GP surgeries and the PHA recommends that parents check arrangements with their own GP's surgery so that their child can get the jab.The earlier you get vaccinated the better, as it takes the body about 10-14 days after the jab to develop antibodies. These will then protect you against the same or similar viruses if the body is exposed to them. The vaccine contains three strains of the flu virus, which are considered the most likely to be circulating this winter, including the H1N1 (swine flu) virus."Your child needs to get the flu jab every year - the protection it gives only lasts for one winter, so even if they got it last year, they still need to get it this year," added Dr Smithson."Also, if your child has been diagnosed with flu or swine flu in the past couple of years, they will still need the jab this year as there are different types of flu that the jab will protect against. Getting the flu jab is the best way to protect your child against flu and we would strongly recommend that you arrange for them to have it."Although the vaccine gives good protection, no vaccine gives total protection, so if your child develops flu-like symptoms (such as fever, cough, aches and pains, and sore throat) you should contact your GP for advice. If your child has any of these symptoms, they should be kept at home until they feel better."For more information on seasonal flu, go to www.fluawareni.info and follow us on Facebook and Twitter.

Smoking causes mouth cancer, PHA warns

Mouth cancer awareness week begins on the 13 - 20 November. With this in mind the Public Health Agency is urging everyone to be aware of the signs and symptoms of mouth cancer and is encouraging all smokers thinking about stopping smoking to make the decision to stop today.In Northern Ireland 195 people were diagnosed with mouth cancer in 2009. The disease causes one death every five hours in the UK and yet it is one of the least well-known cancers. Smoking and excess alcohol consumption is associated with an increased risk of developing mouth cancer, which can occur in or on any part of the mouth, tongue, lips, neck and throat. In its very early stages, mouth cancer can be easy to ignore. Most people with mouth cancer have no early symptoms at all, but others may have:an ulcer in the mouth or on the lip that won't heal; constant pain or soreness; red or white patches in the mouth;a lump on the lip, tongue or in the neck; bad breath; unexplained bleeding in the mouth; numbness in the mouth; loose teeth.The earlier the disease is caught, the better. Survival rates rise to 90 per cent if the cancer is treated before it has spread. Gerry Bleakney, Head of Health and Social Wellbeing Improvement, PHA, said: "Certain lifestyle choices can increase an individual's risk of developing mouth cancer. Tobacco is considered to be the main cause of mouth cancer, with three in four cases being linked to smoking. Excess alcohol consumption is also a known factor, with those who both smoke and drink excessively being up 30 times more likely to be at risk. "Mouth cancer and the treatment required can be traumatic for the patient as this may affect functions such as speech, chewing and swallowing. The positive news is that stopping smoking is associated with a rapid reduction in the risk of oral cancers. Regular trips to the dentist are also a must because half of all mouth cancer cases are detected by dentists."I would encourage everyone who is thinking about quitting to log on to our Want 2 Stop website www.want2stop.info and order a 'Quit Kit' free of charge. Alternatively contact the Smokers' Helpline on 0808 812 8008. "Health Minister Edwin Poots said: "Smoking is the single greatest cause of preventable illness and premature death in Northern Ireland.It is a major risk factor for oral cancer, as well as coronary heart disease, strokes and other diseases of the circulatory system. Approximately 2,300 people die each year in Northern Ireland from smoking related illnesses. Quitting smoking is the single most effective step people can take to improve their long term health."A key objective of the Department's new ten-year tobacco control strategy, due to be published next month,is to prevent people from starting to smoke. Funding provided by the Department for smoking cessation services has resulted in around 650 such services being made available in Northern Ireland in a range of settings, including pharmacies, GP surgeries and community centres. These services have helped almost 80,000 smokers to set a quit date between 2008/09 and 2010/11."The Minister added: "It is also important for people to look after their oral health by regularly attending the dentist for check-ups, as any problems can be picked up and treated at an early stage."

The PHA message is clear for World COPD Day - smoking is bad for your lungs

In 2011, 31,574 people were registered as having Chronic Obstructive Pulmonary Disease (COPD) in Northern Ireland. The most common cause of COPD is smoking and to mark this year's World COPD day, which takes place on Wednesday 16 November, the Public Health Agency is encouraging all smokers to make a decision to stop smoking today and reduce their risk of developing the disease.COPD refers to a group of diseases which includes emphysema, chronic bronchitis, and in some cases asthma. With COPD, the airways in the lungs become damaged, causing them to become narrower, therefore restricting airflow and thus making it harder to breathe. The most common symptoms of COPD are breathlessness, wheezing, abnormal sputum (a mix of saliva and mucus in the airway), and a chronic cough often mistaken for a 'smokers' cough'. Symptoms can range from mild to severe, depending upon how advanced the disease is. In advanced cases, daily activities, such as walking up a short flight of stairs, can become very difficult.There is no cure for COPD. Stopping smoking is the single most effective wayto reduce your risk of developing COPD and avoid any further damage to the lungs. Gerry Bleakney, Head of Health and Social Wellbeing Improvement, PHA, said: "Smoking causes the lining of the airways to become inflamed and damaged and is the biggest cause of COPD. The risk of developing COPD increases the more an individual smokes and the longer they smoke. "The good news is that making changes to your lifestyle can reduce your risk of developing COPD. Stopping smoking reduces the risk of developing COPD and also slows down its progression. There is support available to help you quit and I would encourage everyone thinking about stopping smoking to log on to our Want 2 Stop website www.want2stop.info and order a 'Quit Kit' free of charge. Alternatively contact the Smokers' Helpline on 0808 812 8008 for help on planning to stop smoking or to find out where your nearest Stop Smoking Service is. "The Health Minister Edwin Poots said: "The impact of living with COPD can place a considerable strain on the lives of those suffering from the condition and their families. I understand that most smokers want to quit but it is not always easy to succeed and that several attempts are frequently necessary. I would therefore urge all smokers on world COPD day, to make that commitment to stop smoking. Professional help and support are readily available. There are almost 650 smoking cessation services provided all over Northern Ireland, mostly in community pharmacies, but also in GP surgeries, hospitals, community halls and schools."

PHA reinforce sensible drinking in Alcohol Awareness Week

Recent health figures show that 20% of adults surveyed admitted to drinking over the weekly alcohol limits (1)so the Public Health Agency is using Alcohol Awareness Week (14-20th November) to reinforce the importance of drinking sensibly and staying within safe alcohol limits.Government guidelines on safe drinking are 21 units per week for males and 14 units per week for females. Staying within these limits is important as excessive and binge drinking can lead, in the short term, to increased risk of accidents, antisocial behaviour, impact on relationships, unplanned pregnancy. Longer term it can damage the liver, heart, brain and stomach, not to mention the other human costs, and costs to the economy and society as a whole.Owen O'Neill, PHA Health and Social Wellbeing Improvement Manager and Drugs and Alcohol Lead, said: "The Department of Health, Social Services and Public Safety's drinking limits are in place to encourage the public to develop safe and sensible drinking habits. However, these recent figures highlight that not everyone is adhering to these limits. It is crucial that those who do decide to have a drink do so in moderation and stick to the recommended limits to prevent any long or short term damages".The message is clear, if you drink, remember to be smart and enjoy alcohol within safe limits. People should follow the recommended daily alcohol intake. These are:Men: No more than 3 to 4 units of alcohol a day and no more than 21 units over the course of the week.Women: No more than 2 to 3 units of alcohol a day and no more than 14 units over the course of the week.Examples of units:Can of extra strong lager - 4 unitsBottle of lager - 1.5 unitsPint of standard lager - 2.5 unitsPint of premium larger - 3 unitsSmall pub bottle of wine - 2.25 unitsPub measure of spirits - 1.5 unitsPint of cider - 3 unitsPint of stout - 2.5 units. Remember, that for each unit you drink over the daily limit, the risk to your health increases. It's important to spread the units throughout the week - you can't 'save up' your units for the weekend or an upcoming holiday. It is also important to drink plenty of water, ideally matching the amount of alcohol you have consumed.For further information on sensible drinking and alcohol units visit the Public Health Agency's website www.knowyourlimits.infoReference(1) Health Survey Northern Ireland: first results from the 2010/2011 survey (2011) DHSSPS, http://dhsspsni.giv/index/stats_research/stats-public-health.htm