Tag Archives: bones

How moss led to the solving a grave-robbing mystery

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In 2009, a cemetery, located directly outside of Chicago, revealed a scandal. The employees at the Burr Oak Cemetery in Alsip, Illinois had been accused of digging up aged graves, shifting the remains to other places within the cemetery and selling the burial plots back. One such piece of evidence was a small knot of moss when the case went to trial in 2015.

Researchers have published the original full scientific account of the case in a new article in the journal Forensic Sciences Research where it is described how exactly moss was used to find that a crime had been committed.

The lead author of the paper, Matt von Konrat, the head of the botany collections at the Field Museum in Chicago, is a follower of detective programs on television (the new paper is called Silent Witness on the BBC), but he never thought that his work would bring him into a criminal case scenario. Around 2009, von Konrat received a call on the phone, which happened to be the FBI, inquiring whether she could assist in identifying a few plants, says von Konrat. The FBI appeared at the Field Museum and gave von Konrat a piece of moss which was discovered eight inches under the earth, and the recovered human remains at the cemetery.

What sort of moss it was, and how long it had been lying in the soil, they wanted to know.

First, von Konrat and his associates had looked at the moss under a microscope and compared it with dried moss specimens in museum collections to conclude that it was taxifolius Fissidens, which is also referred to as a common pocket moss. According to von Konrat, they conducted a survey of the various types of mosses found in different locations around the site of the crime and that type of moss was not present in the area. However, examining the remainder of the cemetery we discovered a large colony of that form of moss growing in the same spot where the investigator thought that the bones had been disturbed.

The investigators did not only require the species of the moss, however, they were also concerned about its age. The defendants to the case argued that someone must have exhumed the bones and reburied them at a later time prior to the defendants commencing working in the cemetery. As the moss was buried with the re-buried bones, the length of time that the moss had been under the ground would be used to help prove the date that the bones were reburied.

“Moss,” says von Konrat, “is a bit of a freak. Mosses are intriguingly physiologically regulated so that although they may be dry and lifeless and preserved, still they may have an active metabolism and some active cells. The level of metabolic activity decays with time, and that would inform us about when a moss sample was harvested.”

The metabolic activity of a plant may be determined by its chlorophyll – the green color that is used to photosynthesize the food. The chlorophyll in the cells of plants deteriorates as they die and more of the cells of plants lose the ability to perform their functions. The authors of the research determined the quantity of the light captured by chlorophyll of the moss specimens in known ages, including fresh and those that have been stashed in the museum collections over the past 14 years. Then they repeated the same test on the moss that was picked at the crime scene. The researchers concluded that the evidence moss was no more than a year or two old- which helped the case against the cemetery employees who in 2015 were finally found guilty of desecrating human remains.

https://en.wikipedia.org/wiki/Burr_Oak_Cemetery

“Occasionally, there are also cases when the FBI only has to summon experts to assist in the gathering of evidence, conduct analyses, submit the evidence to the prosecutors and testify to their efforts should a conviction be required. Burr Oak Cemetery case was one of those cases when we approached the Chicago Field Museum Botanical Program, which happened to be of invaluable help since plant material within the cemetery provided the key to charge four individuals and convict them,” says Doug Seccombe, a former FBI agent and worked on the case, as well as, a co-author of the new paper.

Von Konrat has been consulted after the Burr Oak Cemetery case on a number of moss cases. However, these cases are quite few in the field of forensic science: in 2025, he and some of his co-authors released another article, looking into the application of mosses and other bryophyte plants as forensic evidence. It was only within the last century that they had discovered a dozen-odd examples.

“Mosses are usually underrated and that is how we hope our research will help to create awareness that there are other groups of plants out there other than flowering plants and they play a very crucial role in society and around us. However, most to the point, we wish to mention this microscopic group of plants as a law enforcement tool. Should we find the means of raising mosses as possible evidence, perhaps this might prove of service to some families in the future.”

Children are ‘skin and bones’ as Sudan marks a grim milestone

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It is a grim milestone for Sudan, the world’s worst humanitarian crisis. But with insufficient funding, lack of access to key regions and intensifying violence, milestones like this have become the grim norm.  

“This is not hypothetical. It is a looming catastrophe,” said Sheldon Yett, the UN Children’s Fund (UNICEF) representative in Sudan.

And it is a catastrophe that is unduly affecting women and children, many of whom have been displaced multiple times and lack access to even the most basic of services such as clean water, food and protection.  

“Every day the conflict continues in Sudan, innocent lives are lost, communities are torn apart and trauma continues to haunt generations,” said Radhouane Nouicer, the UN’s designated expert on human rights in Sudan.  

Emotional scar tissue 

Children in Sudan are among those most affected by the crisis – 3.2 million  children under five are projected to suffer from acute malnutrition in the next year.

On a recent trip Jebel Aulia, a locality in Khartoum state which is at extreme risk of famine, Mr. Yett was horrified by what he saw.  

“Many of the children are reduced to just skin and bones,” Mr. Yett said.

However, these children are not only contending with malnutrition – some of them have also been displaced four or five times, and over three-quarters of Sudanese children are out of school.  

“The emotional scar tissue is massive – children don’t know where they are going next … often feeling like aliens in their own land,” Mr. Yett said.  

He spoke with one mother in Jebel Aulia whose daughter may be forever changed by the violence.  

“Since the war started, my daughter has fallen into a state of silence, and I can feel her heart racing with fear,” one mother said.  

A gendered crisis

Around Sudan, as the food insecurity crisis spirals, women and girls are the “hungriest face of the crisis,” according to Salvator Nkurunziza, the UN Women representative in Sudan.

“With conditions now at near famine thresholds in several regions in the country, it is not just a food crisis but a gender emergency caused by a failure of gender-responsive action,” said Mr. Nkurunziza at a Tuesday press briefing in Geneva.  

A recent report further drove home the gendered nature of the crisis, revealing that women-led households in Sudan are three times more likely to experience severe insecurity than households led by men.  

This is especially concerning as the death, displacement or forced disappearance of men has left more and more women the sole bread winners. In total 75 per cent of women-led households cannot meet basic food needs.

“The data is unequivocal: female-headed households are slipping deeper into starvation, with fewer coping mechanisms, less access to income, and even more systemic barriers than last year,” the report said.  

Nevertheless, Mr. Nkurunziza reminded the international community that women are not just victims but also agents of change in crisis settings.  

Women-led organizations are on the frontlines, providing food through soup kitchens and supporting displaced families. And yet, they remain excluded from many of the decision-making processes and exposed to undue risks.  

An unchanged human rights landscape

Food security and displacement are not the only challenges that the Sudanese face. Rather, the human rights situation is also deteriorating, according to Mr. Nouicer who visited Sudan to meet key government officials in July.  

“I remain gravely concerned that civilians in Sudan continue to suffer widespread violations and abuses, including extrajudicial killings, sexual violence, forced displacement and arbitrary detention,” he said.  

He specifically highlighted the unique challenges that women, children and people with disabilities face when confronting displacement and violence.  

“The ongoing war has devastated civilian lives and turned daily survival into a constant struggle.”  

‘Irreversible damage’

Mr Yett said that in his most recent trip, he saw the best and worst of humanity – the devastating impact of violence and inaction coupled with the hopeful possibilities that peace and action could provide.  

“We are on the verge of irreversible damage to an entire generation of children, not because we lack the knowledge or the tools to save them but because we are collectively failing to act with the urgency and at the scale this crisis demands,” he said.  

The first step is ensuring access to regions of Sudan like Zamzam which have been cut off from aid. With the rainy season approaching – and some roads already impassable – this is only becoming more difficult.  

Mr. Nouicer highlighted that even if a ceasefire between the warring rival militaries happened, the level of devastation and abuse is so extreme that the future will require more than just peace.  

“The path forward demands more than ceasefires and peace talks. It requires a sustained commitment to justice, accountability, and inclusive governance.” 

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Smile please! Now improved mineralized material can restore tooth enamel

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Scientists have perfected hydroxyapatite, a material for mineralizing bones and teeth. By adding a complex of amino acids to hydroxyapatite, they were able to form a dental coating that replicates the composition and microstructure of natural enamel. Improved composition of the material repeats the features of the surface of the tooth at the molecular and structural level, and in terms of strength surpasses the natural tissue. The new method of dental restoration can be used to reduce the sensitivity of teeth in case of abrasion of enamel or to restore it after erosion or improper diet. The study and experimental results are published in Results in Engineering.

“Tooth enamel has a protective function, but unfortunately, its integrity can be destroyed by, for example, abrasion, erosion or microfractures. If the surface of the tissue is not repaired in time, the enamel lesion will affect the dentin and then the pulp of the tooth. Therefore, it is necessary to restore the enamel surface to a healthy level or build up additional layers on the surface if it has become very thin. We have created a biomimetic (i.e., mimicking natural) mineralized layer whose nanocrystals replicate the ordering of apatite nanocrystals of tooth enamel. We also found out that the designed layer of hydroxyapatite has increased nanohardness that exceeds that of native enamel,” says Pavel Seredin, Leading Specialist at UrFU Center “Nanomaterials and Nanotechnologies”, Head of the Department of Solid State Physics and Nanostructures at Voronezh State University.

 

Scientists tested the effectiveness of the new enamel coating on real healthy teeth./Anastasia Kurshpel / UrFU

Hydroxyapatite is a compound that is a major component of human bones and teeth. Scientists selected a complex of polyfunctional organic and polar amino acids, including, for example, lysine, arginine, and histidine, which are important for the formation and repair of bone and muscle structures. The chosen amino acids made it possible to obtain hydroxyapatite, which is morphologically completely similar to apatite (the main component of tissues) of dental enamel. The researchers also described the conditions of the environment in which the processes of binding of hydroxyapatite to the dental tissue should occur. Only if these conditions are met it is possible to fully reproduce the structure of natural enamel.

“Traditionally in dentistry, composite restorative materials are used in enamel restoration. To increase the bonding efficiency of enamel and composite, the restoration technique involves acid etching of the enamel beforehand. The etching products left behind may not always have a positive effect on the bonding of enamel and synthetic materials. To reproduce the enamel layers with biomimetic techniques, we neutralized the media and removed the etching products using calcium alkali. In this way we improved the binding of the new hydroxyapatite layers,” explains Pavel Seredin.

The formation of a mineralized layer with properties resembling those of natural hard tissue was confirmed by field emission electron and atomic force microscopy as well as by chemical imaging of surface areas using Raman microspectroscopy. The study was conducted on healthy teeth to eliminate the influence of extraneous factors on the resulting layer and to be able to compare the results with healthy teeth. Next, the researchers will tackle the challenge of repairing larger defects, which can be of varying nature from the initial stages of caries to cracks and volumetric fractures.