Sunday, 8 May 2022

What Time of Day to Take Vitamins

 Nearly half the UK population take vitamin supplements, but experts say when and how you take them changes how effective they are.

Iron: Around three-quarters of women are at risk of iron-deficiency anaemia, mainly due to iron loss during their monthly periods.

  • Take on an empty stomach an hour before bed (and two hours after supper) and combine it with vitamin C or A.
  • Vitamin C can help your body absorb iron as it bonds to iron particles, helping them to dissolve more completely in the gut. Vitamin A can also improve iron absorption.
  • Look for iron supplements that contain vitamin A, or its precursor beta-carotene.
  • Take iron supplements on alternate days, as a 2017 study found that more iron is absorbed taken this way.
  • Avoid taking with dairy, tea or zinc pills. Certain foods, especially dairy - including milk-based drinks, can block iron absorption. And since tea sipped with a meal can inhibit the absorption of iron by up to 90%, take your iron pill with water. And zinc competes with iron because both minerals need to attach to the same 'transporter molecules' in the gut.

Calcium: Many menopausal women take calcium to help prevent the bone-thinning disease osteoporosis. Calcium is often combined in a pill with magnesium, which is also good for bones.

  • Take a supplement (ideally also containing magnesium, vitamin D and vitamin K) with food.
  •  Taking calcium with food will also enhance absorption. Look for products with calcium citrate, which is better absorbed than calcium carbonate.
  • Avoid taking with zinc or iron pills.
Vitamin D: In the winter months, around half the UK population is low in vitamin D, a nutrient vital for healthy bones and strong immunity. This is because we make vitamin D via sun exposure on our skin.
  • Take 10mcg during the winter, in the evening with food (or largest meal of the day) containing fat.
  • Vitamin D is better absorbed if taken with a meal that contains some fat, such as avocado, egg yolks or olive oil.
  • Avoid taking with vitamin E pills; as both are absorbed in the same way.
Vitamin C: Important for the immune system and vital for healthy skin and bones. It is a water soluble nutrient that we can absorb in doses of up to 400 mg. Any excess above this is not stored by the body, but passed out in urine.
  • Take in the morning on an empty stomach. 
  • If taking doses larger than 400 mg (e.g. during a cold), split these throughout the day. 
  • A standard supplement will give you more than enough vitamin C so no need to take liposome-encapsulated products.
  • Best absorbed on a completely empty stomach, e.g. before breakfast, as absorption can be hindered by proteins and fibre in food.
Fish oil: A rich source of two omega-3 fats (EPA and DHA) that have proven benefits for a wide range of illnesses including low mood, heart disease and rheumatoid arthritis.
  • Take with food that contains fat, which triggers the pancreas to release enzymes that help break down the omega-3 oils into fragments small enough to be absorbed through the gut wall.
  • Avoid taking before a workout or sleep to avoid unpleasant fishy burps.
B vitamins: The group of eight B vitamins (including B6, B9 (folic acid), and B12 are vital for healthy blood, nerve function and energy levels. They are water-soluble.
  • Take first thing in the morning on an empty stomach. Choose a supplement with a blend of different B vitamins.
  • Take a blend of B vitamins. Taking folic acid alone can trigger or mask a deficiency in vitamin B12.
  • Avoid taking last thing at night as high vitamin B6 doses can interfere with sleep. Avoid taking with food, as vitamin B12, in particular, binds to the food we eat and can then end up passing straight out of the gut as waste without being absorbed.
Probiotics: These are 'good bacteria' that make up part of our gut microbiome - the community of bacteria that plays a vital role in our digestive health and immune system. A poor diet or medication such as antibiotics can kill off good bacteria, helping bad ones to survive, increasing the risk of gut infections or digestion problems. Probiotic supplements aim to replenish levels of good bacteria. As they are live bacteria, they need to reach the gut intact.
  • Take: half an hour before eating. Take before a meal containing some fat. 
  • Avoid: taking with hot drinks, juices or alcohol.
Magnesium: Useful for bone health. 
  • Take: if using alone for a relaxing effect, take at bedtime.
  • Take care: If you take calcium, then magnesium may help ease anxiety, restless legs, muscle cramps, migraine and improve overall sleep. You should take roughly twice as much calcium as magnesium.
How to take supplements
  • Swallow with a big glass of water. Fluid intake is important to dissolve the tablet, especially for water-soluble nutrients such as B vitamins and vitamin C.
  • Avoid coffee, tea and energy drinks (these also contain caffeine) as caffeine can interfere with the absorption of nutrients. And it's best to wait for an hour after drinking coffee to take supplements.
  • Taking a multivitamin could be a waste of money, as some of the nutrients can compete for absorption. And as they contain both water-soluble and fat-soluble vitamins, taking them on an empty stomach means you don't absorb much of the fat-soluble ones, while taking them with a meal may impair absorption of water-soluble ones.
  • Don't eat nuts before taking minerals (e.g. iron, calcium and magnesium). Phytic acid found in nuts, beans and bran binds to minerals in the gut, meaning that they won't be properly absorbed. This only affects absorption of nutrients eaten at the same meal.
Source: Are you taking your vitamins the right way - or just wasting your money? Experts say that when you take them can determine how effective they are by Caroline Jones, Daily Mail, 28 Feb. 2022


Sunday, 1 May 2022

The Sleeping Beauties by Suzanne O'Sullivan

 The Sleeping Beauties - and other stories of mystery illness by Suzanne O'Sullivan (Picador, 2021)

[The author is a medical neurologist. Her other works on this topic are: It's all in your head: true stories of imaginary illness and Brainstorm: detective stories from the world of neurology.]

 The mind has a lot of power over the body. People can lose consciousness or have seizures through a psychological mechanism as well as part of a disease process. At least a quarter of neurology referrals believe they have epilepsy but instead have dis-associative or psychosomatic seizures. Up to one third of referrals attending a neurology clinic are likely to have a psychosomatic complaint - real physical symptoms from psychological or behavioural causes. The presenting symptoms can also be skin rashes, breathlessness, chest pain, bladder problems, diarrhoea, stomach cramps, and more. While these are symptoms of real problems, when scans and tests fail to reveal a physical cause, many still doubt psychological causes. With no single diagnosis or set criteria for conditions like autism and ADHD, there is a risk of interpretation by the user. Sometimes illness is a sign that the life we have chosen for ourselves is not the right one. Anglo-American cultures tend to consider depression as physiological and psychological, where other cultures regard it as situational.

For most of the 20th century psychosomatic disorders have been labelled 'hysteria' and 'conversion disorder' and viewed from Freud's theories, with hidden psychological trauma converted into physical symptoms. Many people, including doctors, still regard repressed trauma and denied abuse as the full explanation for all psychosomatic disease, even when the patient refuses this diagnosis.

Hysteria (and conversion disorder) are more aptly termed 'functional neurological disorders' (FND). In neurology the term 'functional' has replaced 'psychosomatic'; 'functional' indicates a problem with how the nervous system is working and implies a biological cause, not a mental one. The term 'mass psychogenic illness (MPI) has replaced 'mass hysteria'. A true MPI outbreak actually says more about the society in which it occurs, than it does about the individuals affected. 

  • Mass anxiety disorder occurs out of the blue, without any preceding stresses needing to be present. It usually affects young people and happens in contained environments, such as schools. It spreads by direct contact and comes and goes quickly.
  • Mass motor hysteria can affect people of any age, is more insidious in onset and lasts longer. Typically occurs where there is a background of chronic tensions within a close-knit community.  

The big problem with any MPI is how it is perceived and understood publicly. The way such illness is defined and discussed by the small number of experts who study it is often different to how it is understood outside those circles. In the medical field it is a disorder that arises from group interaction, and is sometimes referred to as a mass sociogenic illness - a social phenomenon rather than a truly psychiatric disorder. By others it is largely presented as a psychological problem, focusing on the individual and ignoring the role of the community. The cliches associated with it are very demeaning to young women, and can make the diagnosis unacceptable for social groups that do not easily fit that category, such as older people and males, or even to conflate it with 'faking' illness.

The media do not help with reports of 'mystery illness', even when a diagnosis of 'non-epileptic seizures' has been given. Reporters often state that 'medical tests have not been able to provide any answers, when they do not recognize the diagnosis is a legitimate medical condition. Publicity can even cause further cases in some circumstances.

Western doctors are trained to interpret symptoms in a literal way and treat as personal, but every medical problem is a combination of the biological, the psychological and the social. Positive blood tests or scan results provide evidence that allows others to believe in the suffering.

People find it hard to accept a psychosomatic disorder diagnosis. There is no correlation between severity or chronicity of disability and the disease process. 'Psychosomatic' and'functional' do not imply less severe or less disabling symptoms, nor are they imaginary; they are not self-limiting and can cause sustained disability. For many, they are a self-perpetuating phenomenon. Some get better, but for others the symptoms are intensified by the experience of being sick. Social and medical interventions affect the way a patient feels about the problem, and can even make things worse. More tests and less understanding of doctors' explanations leave people more confused and worried, leading to further searches for symptoms and possible external causes.

Functional neurological disorders are usually anatomically and biologically impossible. Symptoms come from the unconscious plus an inaccurate understanding of how the body works. Reading descriptions of psychosomatic disorders, people typically relate to some part of the illness described and hope to get a formal diagnosis. If a doctor is sure that a positive asylum decision is the only cure for resignation syndrome, people get to know this, and subconsciously further spread the outbreak. And sadly, many people still struggle to accept a diagnosis of of psychosomatic or functional illness and cannot let go of the idea that there is another explanation - a virus, a toxin or an unknown illness. Despite public perception, epileptic seizures are generally brief, while dis-associative seizures last a long time. FND disorders are not imaginary, but even medical practitioners have been know to dismiss them as malingering, while the public view is that it happens to damaged people.

It is not known why young women are more likely to be affected by these disorders, but theirs is typically a voiceless position in society, a strange and impossible position that women are supposed to occupy. Young women are told they are equal, but held back if they try to assert their equality. Also physical changes - cyclical hormones and tendencies to low blood pressure and fainting - can lead to dis-associative seizures. They can be expected to live traditional conservative lives while finding themselves sexualised by older men.

The book includes chapters on specific psychosomatic outbreaks in various countries.

Sweden: From 2005, some Yazidi refugee children, boys and girls, became anxious and depressed, withdrew into themselves, soon couldn't go to school, spoke less or not at all and eventually appeared to be in a coma, had to be fed by nasogastric tube and could not open their eyes. Between 2015 and 2016, 169 Yazidi refugee children in various towns were affected. Medical tests showed no disease so doctors diagnosed 'resignation syndrome', which exclusively affects children of asylum seeking families (who have usually suffered persecution in their homeland). The asylum process is slow, and might initially be refused. During this period children integrate in school and area, and since they speak and write Swedish, they often translate any letters sent to their parents. Medical assessment of age is fraught with error due to the effects of chronic deprivation, abuse and malnutrition that caused their flight. When granted residency, children usually 'woke up' though not overnight. Yazidi children arriving in other countries do not suffer from this  syndrome. Why? Until recently in Sweden, families with children with resignation syndrome were automatically granted automatic asylum, but with record numbers arriving in 2014, emerging hostility to immigrants led to this being dropped.

Texas USA: This state has a population of ethnic Miskito originally from Nicaragua. They have had outbreaks of 'grisi siknis', that were first reported in the 1970s but actually started earlier in Nicaragua. Symptoms include tremors, difficulty breathing, trance-like states and convulsions and begin with sufferers having a visual hallucination of being visited by a frightening stranger of the opposite sex who comes to lure the victim away. In Nicaragua, to escape they run into the jungle, the community find them and a local healer (shaman) will say ritual prayers. In Texas, typically the outbreaks occur in schools (mostly girls but sometimes boys) and when they attempt to run away they are restrained by family despite resisting strongly. In the Miskito community, young girls are subject to a lot of attention from (often older) men trying to pressure them into a relationship. Sometimes the interest is welcome and exciting for a girl but it conflicts with the moral standards of a conservative Christian church they follow. Being afflicted also means you are attractive. Grisi siknis is now part of Miskito culture.

Khazakhstan: The mining town of Krasnagorsk did well for many years with a population of c.6,500 in the 1960s, and was well resourced. When the mine shut in the 1990s, almost the whole of the town became unemployed overnight. As people left for jobs elsewhere, numbers dropped to c.300 in 2010 and just 30 in 2017. From 2010 people reported a wide range of symptoms, but generally older people tended to have long periods sleeping and children to be hyperactive. Cases often occurred in clusters following social gatherings at which happier times were recalled. People did not want to move, but sickness gave a reason why they had to go, and then environmental poison was suggested as a cause for the sickness. Fears about poisoning from the mine were not put to rest despite negative soil and water tests but the government resettlement offer of a move to Esil was not  popular. Unhappy that often smaller accommodation was offered, people felt there was official pressure to move. 

Asia: The Hmong are an ethnic minority in Vietnam. Originally from China, which they had fled at the end of the 19th century to escape persecution, they were then recruited by the US for the Vietnam war; when the US abandoned Vietnam, many Hmong fled to the US as refugees. Within a year there was a high incidence of men dying overnight with no known cause. As illiterate immigrants, used to mountain life and polygamous kinship structure, they found it difficult to live in confined spaces, or to use modern appliances. Their belief systems already included death caused by evil spirits, as do other non-western cultures; but even in the west it is common for people to know of someone who has died within hours or days of a beloved life partner.

Cuba: In 2017 at a time when relations between Cuba and the US were still starting to settle, a group of recently deployed US State Department employees developed serious but unexplained medical problems: headaches, earaches, hearing impairment, dizziness, tinnitis, unsteadyness, visual disturbances, memory problems, difficulty concentrating and fatigue. Despite intensive investigations, no cause was established. All brain scans were normal. Experts were clear that a sonic weapon that could such symptoms did not exist, medical experts were clear that sound did not cause brain damage, but media interest prolonged the investigations. At the  time, relations between the countries were still strained and there was concern over spying, though no physical evidence was ever found.

Columbia: In 2014 a group of schoolgirls had faintings and convulsions that were diagnosed as 'mass hysteria'. Such outbreaks are typically gone in a day but this was still ongoing five years later. Blood tests, brain scans and EEG tests were all negative, but parents felt that some results were held back. Initially media  publicity led to public labelling of the girls as 'crazy', but the community view now is that the HPV vaccine caused it, and referring to supposed incidents in Japan and Italy. This is despite the vaccination being a second dose, the first being given a month previously and having caused no symptoms.

Korea: There is an illness called hwa-byung, meaning fire illness. The condition is referred to as a culture-bound syndrome or folk illness. While the main symptom is a sense of heat or burning all over the body, it also has a cultural meaning. Associated with stress caused by infidelity, it is an acceptable way of asking for support.

END

Sunday, 3 April 2022

Reducing the Number of Premature Births

 At present there are few effective ways to prevent premature births. Such births increase the risk of death or disability in babies.

2022: The state of South Australia has now launched a screening programme that offers free blood tests to all pregnant women to identify and treat those who are low in omega-3. This is due to the findings of a recent research study led by Maria Makrides at the South Australian Health and Medical Research Institute, which investigated a possible link between low levels of the fatty acid omega-3 and premature birth. 

It is not clear why omega-3 fatty acids protect against preterm birth, but there is some evidence that it influences pre-labour changes to the cervix and contractions of the uterus.

  • The results of a trial of supplementation of omega-3 show that it is effective in reducing the risk of birth happening before 34 weeks of gestation by 77 per cent for women who started the trial with low levels of omega-3. 
  • However, the trial also showed that for those women who already had high levels of omega-3, the supplements actually increased the risk. 
  • This suggests that supplementation should only be recommended to women with  low omega-3 levels. However, Makrides says that multivitamins that contain small amounts of omega-3 are fine for women who already have high levels. 

Source: 'Omega-3 supplements could cut the number of pre-term births' by Alice Klein in New Scientist, 5th March 2022.

Some facts about prematurity.

  • In the UK, about eight in 100 babies will be born prematurely.
  • Premature babies, especially those born very early, often have complicated medical problems. The earlier the birth, the higher the risk of complications.
  • Most premature births occur in the late preterm (34 to 36 weeks of pregnancy).
  • Moderately preterm (32 to 34 weeks of pregnancy)
  • Very preterm (less than 32 weeks of pregnancy)
  • Extremely preterm (at or before 25 weeks of pregnancy).

Depending on how early the birth is, the following mild and more severe complications may be present at birth.

  • Small size with disproportionately large head and sharper looking, less rounded features due to lack of fat stores. Fine hair (lanugo) covering much of the body. 
  • Low body temperature, especially immediately after birth (hence the need for incubators).
  •  Difficulty breathing and lack of reflexes for sucking and swallowing, leading to feeding difficulties. 
  • Other problems occur with breathing, heart complications, brain bleeds, low blood pressure, gut problems, anaemia and newborn jaundice, and gut problems.

In the longer term, after birth other complications may occur: cerebral palsy, impaired learning, vision problems, hearing problems, dental problems, behavioural and psychological problems, developmental delays and chronic health issues.

END

Sunday, 27 March 2022

Teenage Brains

 Blame my brain: the amazing teenage brain by Nicola Morgan. Walker Books, 2013.

The human brain contains about 100 billion nerve cells (neurons). Each neuron has a long tail-like part (axon) and many branches (dendrites). A neuron sends super-fast messages to other neurons by passing a tiny electrical current along its axon and across very tiny gaps (synapses) into the dendrites of other neurons. Every single thing you do - thought, action, sneeze, emotion - happens when the neurons send the right messages, very fast, through the complicated web of branches.

Every time you repeat an action, or thought, or recall the same memory, that same web is activated and the web of connections becomes stronger, and the better you are at that specific task. But if you don't use those connections again, they may die off and you forget a fact or a name, or how to do something. To relearn something, you need to rebuild the web of connections by practicing again. If someone has a brain injury (e.g. a stroke) they might need to relearn how to walk or speak.

At birth a human baby has almost all of its neurons but few dendrites and therefore few synapses connecting them - so can't do very much. But their brains develop fast with new dendrites and synapses, as they learn to recognise people, talk and walk. There are also critical periods in brain development. If you don't learn a foreign language before the age of about seven, you can still learn to speak it fluently but probably always speak with the wrong accent, having passed the age when the brain can pick up accents. But most skills can be picked up at any age.

One type of neuron is called a mirror neuron. These neurons fire up when we watch someone else do something. If we watch several times, it may be easier for us to do the same thing because we have watched someone else do it. And it might be these neurons that help us feel what other people are feeling (empathy).

It was thought that all important development takes place in the first three years of life, but now we know that: (1) We can grow more neurons after we are born. (2) The brain grows and develops even into later life. (3) While some neurons die, we sometimes grow new ones. Adolescence is a time of major change in the volume of grey matter in the brain, and some parts of the brain are affected more than others. Not all teenagers show this in their behaviour, but some do.

The part of the brain used for thinking, reasoning,  logic and decision making gets bigger mainly just before puberty (usually 11 to 12 years). But the pre-teen brain grows far too many connections and synapses, and during the teenage years these are cut back: dendrites that don't get used fall away and those that do get used get fewer and thicker.

Body clock: The adult human body clock is 'on' for for about 16 hours of the day when we are awake and it is difficult to sleep in this period. While babies need a lot of sleep, by the age of 9 or 10, we tend to have reached the adult pattern of eight hours of sleep. But research shows that teenagers need around nine hours, at the point they also stay up later - so they are not ready to wake at 7am. 

Sleep: If they are woken too early they risk losing REM (rapid eye movement) sleep which is particularly deep sleep, and seems to be important for memory and learning. Trying to catch up by sleeping more at weekends does not help the body clock and may even disrupt it further. And there is now evidence that the sleeping brain practises the things that you did when you were awake. And the brain is also changing physically by pruning some connections and strengthening others.

Risk taking: Surviving risks means the brain releases dopamine so activating the feelings of pleasure, otherwise we become lazy. But some people's brains are more geared to this than others and adolescents in general do take more risks. Also the pleasure reaction is often stronger than the rational (pre-frontal cortex) part of the brain that logically looks at the risks.  The need to impress friends is important for getting on in life, so teenagers often take different decisions when friends are present. And with puberty starting around 2 years earlier than 50 years ago, alcohol is more widely used, as are (increasingly stronger) drugs. 2013: Rates of sexually transmitted diseases have increased, almost a quarter of 15 year olds smoke regularly and a third have tried cannabis, and a fifth are classified as obese. And around 60% of teenage girls are on diets (often not healthy ones). But remember if a quarter of UK teens get drunk at least three time a month - three quarters don't. 

Female and male brains: [The following statements are averages and not everyone's brain behaves in the same way; the brains of some girls work more in a male way, and vice versa. and it's not about being homosexual or heterosexual.] Boys tend to be interested in technical details of (e.g. a mobile phone) and girls more in the appearance and how useful it is. Boys are more likely to be diagnosed with autism, lacking understanding of social skills and bonding mechanisms. However, this may be less so as if is now being recognised that girls can mask the symptoms of autism by copying behaviour to 'fit in'.

The male brain is typically 10% heavier than a female brain but female brains have a greater proportion of the information-processing grey matter. Women are less likely to have dyslexia, language difficulty, colour blindness, schizophrenia, ADHD, Tourette's and other brain disorders. In later life, men lose brain cells faster and are more likely to develop memory problems.

Sex Hormones: these are chemicals that affect many aspects of our lives. When a sperm fertilizes an egg, the resulting embryo always starts out female. During week 6 or 7 the sex hormones either turn  the embryo into a male (testosterone) or keeping it as female (oestrogen). Normal males will have a small amount of female hormones and females a small amount of male hormones. Hormone levels change during our lifetime and are especially active at puberty. They also change with the season and, for women, during the menstrual cycle.

Oestrogen: One effect of this hormone is to boost dopamine, which can make the world seem rosier, brighter but can also make it feel darker and sadder, and it can cause mood swings. But not all females have mood swings. And mood swings are not only causes by sex hormones. Boys have mood swings too.

Testosterone: Increased testosterone causes aggressive behaviour. Testosterone increases during and after intense sport, especially if you are on the winning side - and also if you are a spectator. Females with the condition 'congenital hyperplasia' have too much testosterone; they show more aggressive behaviour and better spatial skills - both of which are more common in males.

Learning: Different sexes may learn better with different teaching methods. For languages, some pupils (especially boys) may need the rules and grammar explained in a very structured way. In science subjects, some pupils (perhaps more often the girls) may need more rote learning, practical examples or a using comparisons or analogies.

Emotional behaviour: Girls start to use their pre-frontal cortex to control emotional behaviour sooner than boys, who may take longer to develop self-control.

Risk behaviour: Boys seem to take more risks and more dangerous ones - not wearing seat belts or helmets, driving while drunk, binge drink and drink heavily, use and deal drugs, smoke, fight and carry weapons, have sex before 13, overeat and so be overweight. Girls' risk taking is more often having sex when they hadn't intended to, fast or vomit to lose weight or avoid physical exercise.

Body changes: Girls start to look like women before boys start to look like men. This sometimes makes girls feel they are fat. Research using pictures shows that women think men like thinner women, while men didn't choose the same photos.

Developing early or late: Either is difficult for both sexes. Early development in girls creates an extra risk of early sex and alcohol addiction, depression, anxiety and eating disorders. For boys, while they may be more popular and given leadership roles, adults may expect them to be advanced in school work too which is unlikely as their frontal cortex is not mature.

Clumsiness: One the areas of the brain that grow the most in adolescence is the cerebellum, which is important in controlling large movements. However the brain may not have completely rewired itself as fast as the body growth. Stress can also cause clumsiness.

Social: Girls are likely to hit puberty just as they start secondary school, while boys have time to settle in before puberty starts. Both sexes may feel less comfortable with their other-sex parent and argue more with opposite sex siblings. It is thought that this is a biological way of preventing incest which can lead to deformities in offspring.

End

Sunday, 20 March 2022

Women and Science

Human society is diverse and we should celebrate and treasure the strength in this quality. When you don't have diversity in the creative process, you inevitably end up with a single, narrow, distorted perspective that hinders progress. 

While Aristotle answered the question 'What is the immediate source of the design that we see in living things?' correctly with 'It is the information that they inherit from their parents', there is much that he did not understand. For example, he thought that women were 'deficient' and a departure from the male, and believed that they had fewer teeth than men. But while attitudes to women have changed a great deal, in science as in other areas, women still struggle for the recognition they deserve. 

In the world of science, the achievements of women scientists are often not acknowledged, and are instead attributed to male colleagues. This has been named the 'Matilda effect' after the 19th century suffragist and abolitionist Matilda Joslyn Gage.

This is a problem with our culture, not with science. No major international exhibition of contemporary art has ever achieved gender parity, and it is telling how few women have been thought of as great artists throughout Western history.

Nettie Maria Stevens at Bryn Mawr College in Pennsylvania overturned the idea that the environment was important in determining the sex of a child, when she demonstrated that the X and Y chromosomes are responsible. Her colleague and mentor Edmund Wilson is more commonly cited as the discoverer. Though when she died of breast cancer in 1912, the journal Science referred to her worldwide reputation.

In late 1950's France, the credit for Marthe Gautier's work on the discovery of Down syndrome went instead to a male colleague, Jerome Lejeune.

Marie Sklodowska Curie, of Polish origin but who had to conduct her research in Paris, became the first women to win the 1903 Nobel Prize for Physics. In 1910 she lost the vote over her nomination as a member of the French Academie des Sciences. The following year she won the Nobel Prize for Chemistry, becoming the only person to win the award in two different sciences. The Academie only elected its first female full member in 1979, the mathematician Yvonne Choquet-Bruhat.

In the US, Esther Lederberg deserved more credit for her work in bacterial genetics, including the discovery of a virus that infects bacteria, but was given a shared Nobel prize in 1958 with her husband Joshua Lederberg. Esther was more adept at experimental work than Joshua. A major pioneer of bacterial genetics, Esther discovered the lamda phage, which is widely used to study gene regulation and genetic recombination. She also invented the replica plating technique, which is used to isolate and analyse bacterial mutants and track antibiotic resistance. This work was crucial to Joshua's research.

At the John Hopkins University, Baltimore, US, graduate student Candace Pert helped discover the opiate receptor (the cellular binding site for the body's own painkillers, endorphins, in the brain) and famously protested when only men went on the share the Nobel Prize for this work.

Who knows how different our world would be if pioneers such as Hilde Mangold and Rosalind Franklin had not died so tragically young? It is tempting to think that fertility science would have become more focused on making reproduction easier and more comfortable for women. But we all know that if Mangold and Franklin and other remarkable women like them had lived to an old age, it is doubtful if the dial would have turned much from male control to female empowerment.

Hilde Mangold (1898-1924) was a German embryologist best known for her 1923 dissertation which demonstrated embryonic induction, the capacity of cells to direct the developmental trajectory of other cells. This work was the foundation for her mentor, Hans Spemann's 1935 Nobel Prize for Medicine for the discovery of the embryonic organizer, and remains a fundamental concept and area of ongoing research in the field. Her dissertation is one of the very few doctoral theses in biology that have directly resulting in the awarding of a Nobel Prize. 

Rosalind Franklin (1920-1958) was an English chemist and X-ray crystallographer whose work was central to the understanding of DNA, RNA, viruses, coal and graphite. She is best known for her work on X-ray diffraction images of of DNA which led to the discovery of the DNA double helix - for which Francis Crick, James Watson and Maurice Wilkins shared the Nobel Prize in Phsiology or Medicine in 1962. Watson suggested she receive a Nobel Prize in Chemistry, but the Nobel Committee did not usually make posthumous awards, and are not currently permitted. (If a person is awarded a prize, but dies before receiving it, the prize is still presented.)

The fact is that the heroic narrative of the brilliant scientist who died tragically young has been told many times when it comes to men such as Alan Turing, Srinivasa Ramanujan and Blaise Pascal. But it is only in recent years that the many talented women who died before fulfilling their potential have started to rise out of the murk of history.

In 2020 the gap still remains. A 2018 study of more than 10 million research papers concluded that women were less often in authorship positions linked with seniority. Other studies show that grant reviewers award lower scores to proposals from women. And women often still feel it intimidating to speak in public, and are less likely to ask questions after a talk.

Source: The Dance of Life: symmetry, cells and how we become human. Magdalena Zernicka-Goertz & Roger Highfield. W.H. Allen, 2020.