Mr. Hartan's Science Class

"Knowledge is a reckoning . . . a way to assess your location, your true position, not a strategy for improving your position." -Walter Kirn-

Archive for December, 2008

Soda, Fat and You

Science Meets Art

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Credit: Caryn Babaian, Bucks County Community College, Newtown, Pennnsylvania

Biology teacher Caryn Babaian recreates Leonardo da Vinci’s Vitruvian Man on the blackboard in her introductory anatomy class. She uses the iconic sketch as a “multiconceptual image” to illustrate rotation, transparency, and transverse section, and requires her students to draw the image in their notebooks as they watch it take shape on the blackboard.

Blood from mosquito traps Finnish suspect

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Police in Finland believe they have caught a car-thief thanks to a DNA sample taken from a sample of his blood found inside a mosquito.(AFP/OFF/FIle)

Yahoo News:

HELSINKI (AFP) – Police in Finland believe they have caught a car-thief thanks to a DNA sample taken from a sample of his blood found inside a mosquito.

Last June a car was stolen in Lapua, some 380 kilometres (235 miles) north of Helsinki. It was soon found near a railway station in Seinaejoki, about 25 kilometres from where it was stolen.

“A police patrol carried out an inspection of the car and they noticed a mosquito that had sucked blood. It was sent to the laboratory for testing, which showed the blood belonged to a man who was in the police registers,” inspector Sakari Palomaeki told AFP.

The suspect, who has been interrogated, has insisted he did not steal the car, saying he had hitchhiked and was given a lift by a man driving the car.

Palomaeki said a prosecutor would decide if the evidence was solid enough for charges to be pressed.

Finnish police said it was rare for them to use insects to solve crimes, although they are interested in everything found at a crime scene.

“It is not usual to use mosquitoes. In training we were not told to keep an eye on mosquitoes at crime scenes,” Palomaeki said, laughing.

“It is not easy to find a small mosquito in a car, this just shows how thorough the crime scene investigation was,” he added.

 

The Yawn Explained

Yawn

(Discovery News)

Dec. 15, 2008 — If your head is overheated, there’s a good chance you’ll yawn soon, according to a new study that found the primary purpose of yawning is to control brain temperature.

The finding solves several mysteries about yawning, such as why it’s most commonly done just before and after sleeping, why certain diseases lead to excessive yawning, and why breathing through the nose and cooling off the forehead often stop yawning.

The key yawn instigator appears to be brain temperature.

“Brains are like computers,” Andrew Gallup, a researcher in the Department of Biology at Binghamton University who led the study, told Discovery News. “They operate most efficiently when cool, and physical adaptations have evolved to allow maximum cooling of the brain.”

Speciescape

species-scape

This speciescape illustrates the relative diversity of insects in relation to other species groups. The relative diversity is proportional to the size of the organism and therefore in the illustration above the fly is much larger than all the other organisms.

Science News: Original Ancestor

081217124200Black smoker at a mid-ocean ridge hydrothermal vent. Researchers generally believe that LUCA (Last Universal Common Ancestor) was a heat-loving or hyperthermophilic organism, similar to those found today that live deep under the ocean in hot vents along continental ridges. New evidence, however, suggests that LUCA was actually sensitive to warmer temperatures and lived in a climate below 50 degrees. (Credit: P. Rona; OAR/National Undersea Research Program (NURP); NOAA)

Winter Solstice

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Solstice at Newgrange

Credit: Photograph by Cyril Byrne-courtesy of The Irish Times

Victory

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Useful Cell Biology Links

The CSI Effect

Read ‘The CSI Effect’ at NEATORAMA.com

csi-gil-grissomCSI’s Gil Grissom – via Wikipedia

Inner Life of a Cell

Tay-Sachs Disease and Enzymes

enzyme3

b -hexosaminidase A

Please Answer the Following Questions (3 paragraphs). Remember–do not to include your full name in your posts (example: John T. Period 3).

http://www.marchofdimes.com/pnhec/4439_1227.asp

(useful link but you made need to access other resources)

1. What is Tay-Sachs disease and who does it affect?

2. What are the symptoms of Tay-Sachs? What is the prognosis for a child with Tay-Sachs disease?

3. Explain how enzymes play a role in the genetic disorder. Be detailed.

Beautiful View of the Universe

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Image courtesy of NASA

Microscope Photography

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(image by Tora Bardal)

posted at www.darkroastedblend.com (the site for Weird and Wonderful Things)


NASA: Astronomy Picture of the Day

Universe Expansion

Inflating the Universe (2006 March 23)
Credit: WMAP Science Team, NASA Explanation: The Universe is expanding gradually now. But its initial expansion was almost impossibly rapid as it likely grew from quantum scale fluctuations in a trillionth of a second. In fact, this cosmological scenario, known as Inflation, is now reported to be further quantified by an analysis of three years of data from the WMAP spacecraft. WMAP’s instruments detect the cosmic microwave background radiation – the afterglow light from the early Universe. WMAP’s amazing success in exploring the first trillionth of a second and favoring specific inflationary scenarios lies in its ability to make unprecedented, precise measurements of the properties of the microwave background. The subtle properties are distilled from conditions in the early Universe and related to its first moments of existence. Schematically, this diagram traces the 13.7 billion year (plus a trillionth of a second …) history of the Universe from the quantum scale to the formation of stars, galaxies, planets, and WMAP.

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