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Sunday, October 2, 2011

Reflections

I feel that the forensic science module is fun and enriching and i have learnt a lot from it. I hope to be able to attend such courses in the future.

On Newspaper article:

I feel that forensic science was greatly used in this finding of Ned Kelly, despite him being dead for more than 100 years. If there was no forensic sciece, they would not be able to solve the case of the bones. This example is ideal to show the power and importance of forensic science. 

Article on forensic science

A Hero’s Legend and a Stolen Skull Rustle Up a DNA Drama





MELBOURNE, Australia — Even with the best scientific techniques, you can’t always get what you want. But if you try, as the Rolling Stones put it, sometimes you get what you need.
An undated photograph of Ned Kelly, top, and his headless remains in Melbourne.                           

Multimedia
Consider the case of Ned Kelly’s skull.

In Australia, Kelly needs no introduction; for Americans, it may help to think of him as Jesse James, Thomas Paine and John F. Kennedy rolled into one.

Born about 1854 to an Irish convict exiled to Australia, Kelly became a folk hero as a very young man. He took up arms against a corrupt British constabulary, robbed banks and wrote an explosive manifesto. He was shot and arrested in a final shootout in which he wore homemade metal armor, and in 1880 he was hanged by the Anglo-Irish establishment he despised.
As with any semimythical hero, Kelly’s public has always hungered to get closer to the legend. His armor, cartridge bag, boots and a bloody sash became state treasures.

But perhaps the most priceless among them is his missing skull — the subject of a tangled forensic drama that was finally resolved on Wednesday, at least in part, after decades of investigation, debate, tantalizing leads, stalemates, false starts and what can only be called skulduggery.
After his execution, Ned Kelly was buried in a mass grave at a prison, the Melbourne Gaol. There his remains might have quietly and invisibly decomposed but for a mistake by 19th-century gravediggers: They used a type of lime that slowed decomposition instead of hastening it.
So when the grounds were dug up for development in 1929, startled workers found the site full of skeletons. Officials began to move the remains to another prison. But in a scene of chaos that became a local scandal, a crowd of schoolboys and other onlookers ran amok among the coffins, seizing bones — including, it was thought, the skulls of Ned Kelly and Frederick Bailey Deeming, the notorious British serial killer who may have been Jack the Ripper.
While the jail remains were reburied at Pentridge prison, the skulls were recovered soon after being stolen. They then embarked on a separate, winding journey through the back doors of a number of institutions.

In the 1970s, one skull was put on display in a jail museum alongside Kelly’s death mask, a plaster cast impression made shortly after his execution. (It is unknown whether that mask was the original or a copy.)

But in 1978 the skull was stolen again, and a man named Tom Baxter told journalists that he had it.
Mr. Baxter held onto the skull for over three decades, promising to return it if the government gave Kelly a Christian burial. The government did not respond, and the stalemate continued until 2008, when yet another excavation uncovered more prisoners’ remains. At least 3,000 bone fragments were exhumed and sent to the Victorian Institute of Forensic Medicine. It was thought that Ned Kelly’s bones might be among them.

Shortly after that, Mr. Baxter handed over a fragile, sun-bleached skull to the authorities.
The forensic institute conducted a 21-month investigation of the skull, mixing historical detective work with an array of innovative scientific analyses.

Scientists used historical photographs, cranial plaster casts and a copy of the Kelly death mask to determine whether the skull from Mr. Baxter had indeed been unearthed in the 1929 exhumation. When it came to the skull’s genetic material, however, the scientists faced some serious obstacles. DNA is well preserved in bone but highly vulnerable to contamination. They could not simply cut a square out of the skull, grind it to a powder and extract DNA from that; Joy Beyer, a molecular biologist at the institute, said she was told that the skull could not be damaged.
Finally, the institute sent samples from the skull and other remains to a forensic laboratory in Argentina that specializes in degraded and aged remains. That lab successfully extracted DNA from almost all of the samples.

Even so, the DNA meant little in isolation. The investigators needed something, or someone, to match it against.

Hoping to find DNA in Kelly’s dried blood, they located the boots, bag and sash he wore the night he was shot. “Dried specimens on cloth can preserve DNA for hundreds, even thousands, of years,” said David Ranson, a pathologist at the institute.

But the boot and the bag had no usable DNA. The sash, which they found in a country museum, had been thoroughly washed before it was put on display. And a search for the original Kelly death mask — which might hold a stray eyelash or some skin — came up empty.

Next, the investigators looked for relatives. They found Leigh Olver, an art teacher who was descended from Ned Kelly’s mother, down a direct line of women. He donated blood for analysis, and they compared his mitochondrial DNA with that of the skull.

On Wednesday, the forensic institute announced the disappointing results of that analysis. It appears that after all this time, after being abducted more than once, placed on display for the world to see, hidden for decades, cherished, handled, sought after and tested, the skull is not Ned Kelly’s. “Mr. Olver’s DNA and the DNA from the skull do not match,” said Fiona Leahy, a historian and legal adviser at the institute.

There was one rather powerful note of consolation. The investigators found a match between the Olver DNA and one set of bones dug up at Pentridge, including a palm-size fragment of skull. So while most of Kelly’s skull is still missing, the rest of him appears to have been found.
As for the stolen skull, it could belong to the serial killer, Frederick Deeming, who died in 1892. The forensic institute is seeking a maternal relative to test DNA.

What of Kelly’s skeleton? Should it be returned to the extended family? Or should there be a public grave? Many Australians regard Kelly as a national hero. Countless books and movies tell the story of his life. But others see him as a villain.

“You can’t just bury the man,” Mr. Olver said. “Someone is going to dig him up again in half an hour.”

Activity 4- Fingerprints


The number of fingerprints that are loops are the most, followed by whorls, arches and composites.

Friday, September 30, 2011

Activity 3 - Skeleton measurements

My bone measurements(in cm) :

Humerus- 28.0
Radius- 24.0
Femur- 52.0
Tibia- 32.0

Theoretical height(in cm) :

Humerus- 151.7
Radius- 164.6
Femur- 179.0
Tibia- 154.7

Simon's measurements(in cm) :

Humerus- 27.0
Radius- 22.0
Femur- 40.0
Tibia- 35.0

Theoretical height(in cm) :

Humerus- 148.4
Radius- 157.9
Femur- 156.5
Tibia- 161.8

Reasons for discrepancies

1. Some people have a longer specific body part, thus, it is difficult to accurately measure his/her height.

2. The measuring tape might be faulty.



My golden ratio is 1.64 corrected to 3 sf. ( Φ Golden Ratio= 1.618 033 988 7...)

The case of the middle aged woman

Annie told Sherlock Holmes that she saw "a shadow" and was sure that it was the grizzly bear. However, the shadows of a human being and a bear are different and Annie was able to differentiate that Bill's shadow was not of a grizzly bear. Thus, Holmes was sure that Annie murdered Bill.

Monday, September 26, 2011

Activity 2- Avatar making and description writing

                                                                        My Avatar-





Steve Jobs-


Steve Jobs has bald hair and wears spectacles. He has a curve chin and small eyes.

Tuesday, September 20, 2011

Activity 1- Lefty Lewis

1. Evidence that may have been left at the scene of the crime.

-his blood stains that contained his dna
-fingerprints
-torch that had fallen out
-Car's leaking oil that showed his route
-tyre tracks that showed the path
-his car being chipped by the gate

2. Evidence that might have been taken away by Lefty

-paint of the gate when it was chipped by his car
-the lost jewellery
-soil on his shoes

3. Suggestions for the forensic scientist

Lefty is the thief as there are many evidences such as fingerprints that were found in the mayor's house and the blood stains that contained his dna, proving that he was present when the incident happened.

Thursday, September 15, 2011

Summer Arctic melt among worst ever

"Depending on whom you ask, this year’s annual minimum of Arctic sea ice either broke or came close to breaking the record set in 2007. And that’s without the unusual weather conditions that conspired to melt so much ice that historic year.

Increased melting of the Arctic Ocean’s frozen lid in the last few decades underscores a changing northern reality, scientists say — that summer sea ice is on a downward spiral. “The bigger picture here is this is continuing the long-term decline in sea ice cover,” says Mark Serreze, director of the National Snow and Ice Data Center in Boulder, Colo.

Arctic sea ice melts back in the summer and re-freezes each winter, on average a little less each year in recent decades due in part to warming temperatures.

On September 9, University of Bremen researchers announced that the sea ice had bottomed out the previous day at 4.240 million square kilometers, breaking its 2007 record low of 4.267 million square kilometers. But another group that uses the same data, from a microwave instrument on board the Aqua satellite, puts 2011 in second place, at least as of September 14.

That estimate, which comes from the Japan Aerospace Exploration Agency, working with the International Arctic Research Center at the University of Alaska Fairbanks, uses a different algorithm and hence gets slightly different results, says Walt Meier of NSIDC. The discrepancy may stem in part from the Bremen group’s ability to capture more fine-scale details such as small open-water areas atop the ice, of which there were plenty this year.

For its part, the NSIDC uses a different microwave instrument aboard a defense meteorological satellite to study ice cover. On September 13 the center announced that Arctic ice was near its record low: 4.34 million square kilometers on September 10, compared with the 2007 minimum of 4.17 million square kilometers (by its calculations).

“We are sitting at number two and I think we’re going to continue to sit at number two,” Serreze says, noting that summer’s end is already bringing cooler temperatures to the Arctic. The NSIDC doesn’t release final numbers until after the sea-ice skin has grown for several days.

To reach the historic 2007 minimum, high pressure over the Beaufort Sea and low pressure over northeastern Siberia pumped a lot of heat into the Arctic while persistent winds from the south melted and packed the ice together. This year, conditions were neither particularly favorable nor unfavorable for ice loss, Serreze says; instead, the loss might trace back partly to ice conditions this spring. “The spring ice cover is just so thin now that it can’t take a hit,” he says.




My Reflections

I feel that if nothing is done to stop global warming, we could possibly in a water-filled country in 50 years time. Despite efforts to prevent global warming over the past few years, the melting of the ice is still not dropping. This shows that we have to put in more effort into conservation of resources and less pollution.

Tuesday, September 13, 2011

Genetically Modified Glowing Beagle

Tegon is her name and glowing is her game. Tegon is not the only animal that has been genetically modified to glow; she joins a red fluorescent puppy named Ruppy and Mr. Green Genes the cat. Tegon is a beagle and was created by Byeong Chun Lee, the director of the Seoul National University Hospital for Animals in Korea, and his colleagues in 2009. Lee told Discovery news, “The entire body of the dog glows. One can witness a slightly yellower change in the color of the dog’s skin, but to the naked eye, fluorescence cannot be seen without the presence of UV light and goggles.”

There was a five step process that had to happen in order to produce Tegon:

The first step was to insert a piece of DNA that controls the way a green fluorescent gene is expressed into dog cells. After modifying the dog cells they injected them into the DNA of an immature female reproductive cell before it’s fertilization. Step three consisted of producing an embryo using a technique called Somatic Cell Nuclear Transfer. This embryo was implanted into a mother beagle. Tegon was born 60 days later with the ability to glow under UV light when given a certain antibiotic called doxycycline. The study started in 2009, but the details of the study was just released last month. Now Tegon is grown and with pups of her own. It hasn’t been made clear whether her pups inherited her glowing talents.
Reflections

My first reaction to this article was "Wow its impossible, how is a dog able to glow?". However, i was won over and i am impressed by the improvements of genetically modified things. I certainly hope that other animals can also be genetically modified to glow as it would be fun to see them glow in the dark. Wouldnt it be cool if humans could glow too?

"Diamond Planet"

Australian astronomers have recently discovered a diamond planet in space on Thursday August, 25th. Before it became a diamond planet it was known as a White Dwarf. The Diamond planet was created by radio waves coming off the planet’s sun, a rare spinning neutron star named PSR J1719-1438. R

Researchers reported in Science that the radio waves were let of by PSR J1719-1438 a little over every two hours and it only sent one wave at a time. These waves ate away at the planet’s surface until it was one big diamond. Matthew Bailes at the Swinburne University of Technology in Melbourne says that,”the evolutionary history and amazing density of the planet all suggest it is comprised of carbon,” and a little oxygen. With the strong pull of gravity the carbon crystallizes making the planet one big diamond.

The mega huge diamond is about half the size of Jupiter with the same mass, but it’s density is twenty times more than Jupiter. It’s diameter has been measured to be approximately 34,175 miles. The over-sized gem is located in the Serpens constellation, which is, from our solar system, only an eighth of the way toward the middle of the Milky Way.

Most spinning pulsars that spin at a rate faster than once every twenty milliseconds are part of a binary star system and usually only thirty percent of them are companied by other stars or planets. This specific discovery is so rare because there is only one other existing spinning pulsar with an companion the size of a planet.



Reflections

I feel that this discovery is important the field of Astronomy. Being a fan of astronomy, this planet is a huge breakthrough as this planet is rare, with only one other existing pulsar with a companion the size of a planet. I feel that the planet is beautiful too, as the "diamond planet" is made up of crystallized carbon that makes it shiny like a diamond.

Sunday, September 11, 2011

Saturn

Saturn is the six planet from the Sun. It is name after the Roman Gad Saturn. Its astronomical symbol represents the Roman's God sickle.

Fun Facts:

1. Saturn is a gas giant, along with Jupiter, Uranus and Neptune.
2. Saturn has rings surrounding it.
3. Wind speeds on Saturn can reach 1800km/h.
4. It takes Saturn 29.5 years to revolve around the Sun.

Saturday, June 4, 2011

Chromatology

Chromatography is the collective term for a set of ;ab techniques to seperate mixtures. It involves passing a mixture dissolved in a "mobile phase" through a stationary phase, which separates the anayte to be measured from other molecules in the mixture based on differential partitioning between the mobile and stationary phases. Subtle differences in a compound's partition coefficient result in differential retention on the stationary phase and thus changing the separation.

Reflections on Term 2 science

I feel that I have learnt a lot in term 2. The most interesting thing that I learnt was chromatography, which was to separate colors. In that lab lesson, I managed to separate different colors from two black ink. I had a lot of fun doing that.

Saturday, April 30, 2011

Amphibians: Disappearing act

Yesterday was Save The Frogs Day. about a third of today's amphibians are already facing extinction. A recent global frog hunt, Search for Lost Frogs, which aimed to record the survival status of likely-extinct amphibians that have not been seen over the past decade. It found only 4 out of 100 species. Lets take a look at a few of them......

No.1: Asia's tiniest frog (Microphyla nepenthicola)
  • Adult measures 10.6mm to 12.8mm long
  • Tadpoles grow in water collected inside the pitcher plant
  • Found in Sarawak, Borneo
No.2 : Beaked toad (rhinella)

  • This 2cm long frog has deep purple skin speckled with small blue blotches
  • The color and shape of its head resembles the dead leaves on which it lives
  • Found in Choco, Colombia






















No.3 : Chalazodes Bubble-nest Frog
  • Last seen: 1874
  • Found in India
  • Critically endangered
  • It has a unique fluorescent green body with ash-blue thighs and groins
No.4 : Glass/Crystal Frog (Mr. "Nothing-to-hide)
  • Endangered
  • Named for its translucent body
  • More than 150 species of glass frogs reside in cloud forests in Central and South America.
No.5 : Wood Frog (Mr. "Freeze & Thaw")
  • Least concern
  • It creates an antifreeze like solution in its blood to literally freeze in winter
  • The minimum survival temperature is -4 to -5 deg C
  • When spring arrives, the frog thaws and its heart starts pumping again and it is revived-- unharmed

Sunday, April 24, 2011


Reflections:

I think this is a very cool video on chemical reaction. The magnesium stripe when reacting with fire, in other words being burnt, create a white, bright light. The end product is a white and powdery magnesium oxide.

Magnesium (Mg) + Oxygen (O2)= Magnesium oxide (Mg0)


Thursday, February 3, 2011

Nature's weirdest animals






From newly discovered deep-bottom dwellers to mammals that look like rodents, nature has unravelled some outright weird-looking creatures



1. Scientific name: Psychrolutes marcidus
AKA : Blobfish
Found in : Australia
-dubbed as the world's most miserable-looking fish
-made up of a muscle-free gelatine-style mass that allows it to live at depths of 800m
-diet includes sea urchins and mollucs
-swallows edible matter that flows in front of it

2. Scientific name: Ambystoma mexicanum
AKA : Axolatl
Found in : Mexico
-this amphibian is able to regenerate lost limbs
-retains juvenile characteristics into adulthood
-popular in the aquarium trade
-roasted axolotl is considered a delicacy in Mexico

3. Scientific name: Grimpoteuthis
AKA : Dumbo Octopus
Found : Floor of every ocean in the world
- swallows its prey, mostly made up of worms and crustaceans
- can live at extreme depths of 3000-4000m, and even up to 7000m

4. Scientific name: Craseonyteris thonglongyai
AKA : Bumblebee bat
Found : Thailand and Myanmar
- measures up to 2.5cm
- feast on insects
- roosts in groups and is active only in dusk

Friday, January 28, 2011

Young Again







Scientist may have found the way of slowing the age of humans. Firstly, we will look into why humans age.

1. Chromosones in cells are capped by telomeres, which looks like shoelace tips.
2. Each time a cell divides to create new skin blood or bone, it uses a bit of telomeret to create the new cells.
3. After 50 to 70 divisions, the telomere runs out
4. Cells die because there is not enough telomere to create new cells.
5. Cells without telomeres may also fuse with each other, creating dangerous mutations, so cells usually kill themselves when the telomere is used up.
6. Telomeres get shorter and shorter as more cells die. As human body ages, the body becomes more prone to diseases and eventually dies.

Harvard scientists have genetically enginered mice without telomerase, an enzyme used to create telomeres. These mice became prematurely aged and diseases-ridden. But after they injected the mice with a drug that stimulates telomerase production, the mice became younger, less diseased and more active.If a similar drug is found for humans, cells may divide indefinitely, slowing age indefinitely.

Objections: 1.Some scientists question the comparison between engineered mice and normal human growth.
2. Others believe telomere erosion is not the dominant cause for human ageing.
3. Also, mutations in telomerase may cause cancer and help tumors grow faster

Why mouse? 1.Mouse have 70-90% of human's dna. 2. Because of their small body size, large numbers can be housed together in relatively small places. 3. They reproduce quickly and in large numbers.

Friday, January 21, 2011

Vanishing Act

Invisible World

Do you believe things can be made invinsible? If you don't, I am now going to to introduce you into a world of invisibility. There are a few types of invisibility cloaks. Firstly, I will be talking about the radar cloak. The radar cloaks purpose is to minimise detection by radar, which uses radio waves to detect objects. How? The cloak is created using materials and paint which absorb radar waves. It is only used on stealth planes, such as the F-22 Raptor and some Navy ships, such as the Singapore Navy. However, there are some limitations-- 1. Bad weather can increase chances of detection. 2. No radar-absorbent materials is effective for all radar bandwidths. Next, I will be talking on the Sonar Cloak, which basically absorbs sound so that ships and submarines are "hidden". There is one limitation-- 1. Active sonar can be absorbed at near distances. Lastly, I will be talking on the optical cloak, which can hide tanks and planes in plain sight! With the optical cloak, you can hide pipes and protrusions and hide the observer observing wildlife. However, the optical cloak can only currently work on micro and nano metre objects. The good news is that the optical cloak can start to cover bigger and bigger objects. What fun would we have playing with Harry Potter's "Invisibilty Cloak!" For now, it is only a dream, but someday, we will be able to.

Saturday, January 15, 2011


Mercury

Mercury is the first and nearest planet from the sun. It has no moons and orbits the sun every 87.969 days. It is called Mercury( the winged messanger from roman mythology) as it is orbital rate is faster than all of the plantets. Its surface is about the same as the moon- rocky and lots of craters. Do you know why? During Mercury's formation, it was bombarded with many comets. Mercury has a thin but unstable atmosphere. It has a magnetic field unlike the moon that is approxinately 1% of Earth's. Its average speed is 47.87 km/s. Its ditance from the sun is 57, 910,000 km or 38 AU.( AU=Astronomical Unit)(1AU is the distance from the sun to the earth) Its diamter is 4880km.