ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

1

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Hunting habits of lions [Inner Workings] (2013)

Williams, S. C. P.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2013-09-25

Description: A GPS-collared lioness in South Africa’s Kruger National Park surveys the landscape. Image courtesy of Craig Tambling. As the sun sets on the African Savannah, lionesses can be spotted prowling the open land, hunting and making kills, often as a group. Males are more often lounging around during this time,...

Keywords: Inner Workings

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Ecological monitoring in Peru [Inner Workings] (2013)

Horne, R.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2013-09-11

Description: Patricia Alvarez (Left) and a colleague measure vine growth in Peru’s Manú National Park as part of an ecological assessment team. Patricia Alvarez travels 2 days by boat deep into the remote center of Peru's Manú National Park to Cocha Cashu Biological Station to measure 7,000 trees and vines by...

Keywords: Inner Workings

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Freeing the dinos within [Inner Workings] (2014)

Ornes, S.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2014-12-03

Description: Paleontologists have long faced a daunting obstacle to their research: Fossils are usually embedded in rock. To manually wrench the fossils out, scientists use an array of tools, from needles to dentist’s drills to dissolving acids, often with destructive results. Swedish paleozoologist Erik Jarvik, for example, famously took 25 years...

Keywords: Inner Workings

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Cell and DNA repository [Inner Workings] (2013)

Williams, S. C. P.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2013-02-20

Description: pnas;110/8/2686/UNFIG01F1unfig01A technician removes cryopreserved cells from a deep freeze at the Rutger’s Cell and DNA Repository. Image courtesy of Jay A. Tischfield, founder and Chief Executive Officer of RUCDR, Piscataway, NJ.From the outside, it looks like any typical academic building on the Rutgers University campus. However, inside RUCDR (formerly Rutgers...

Keywords: Inner Workings

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5

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Intro to special issue artificial photosynthesis [Introductions] (2012)

Concepcion, J. J., House, R. L., Papanikolas, J. M., Meyer, T. J.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2012-09-26

Description: In the early 1970s, the works by Fujishima and Honda (1) and Honda et al. (2) reported on the results of a now famous experiment. They showed that band gap excitation of anatase TiO2 in a photoelectrochemical cell with a Pt counter electrode and an applied bias resulted in water...

Keywords: Chemical Approaches to Artificial Photosynthesis: Solar Fuels Special Feature

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6

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Narrow the gap of water oxidation to PS II [Chemistry] (2012)

Duan, L., Araujo, C. M., Ahlquist, M. S. G., Sun, L.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2012-09-26

Description: Water oxidation catalysts are essential components of light-driven water splitting systems, which could convert water to H2 driven by solar radiation (H2O + hν → 1/2O2 + H2). The oxidation of water (H2O → 1/2O2 + 2H+ + 2e-) provides protons and electrons for the production of dihydrogen (2H+ + 2e- → H2), a clean-burning and high-capacity energy carrier. One of the obstacles now is the...

Keywords: Chemical Approaches to Artificial Photosynthesis: Solar Fuels Special Feature

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7

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Photocatalytic CO2 reduction to formic acid [Chemistry] (2012)

Tamaki, Y., Morimoto, T., Koike, K., Ishitani, O.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2012-09-26

Description: Previously undescribed supramolecules constructed with various ratios of two kinds of Ru(II) complexes—a photosensitizer and a catalyst—were synthesized. These complexes can photocatalyze the reduction of CO2 to formic acid with high selectivity and durability using a wide range of wavelengths of visible light and NADH model compounds as electron donors...

Keywords: Chemical Approaches to Artificial Photosynthesis: Solar Fuels Special Feature

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8

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Step-by-step self-assembled hybrids that feature control over energy and charge transfer [Chemistry] (2012)

Grimm, B., Schornbaum, J., Jasch, H., Trukhina, O., Wessendorf, F., Hirsch, A., Torres, T., Guldi, D. M.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2012-09-26

Description: In the current work, we have documented the use of two complementary supramolecular motifs, namely multipoint hydrogen bonding and metal complexation, as a means to control the step-by-step assembly of a panchromatically absorbing and highly versatile solar energy conversion system. On one hand, two different perylenediimides (1a/1b) have been integrated...

Keywords: Chemical Approaches to Artificial Photosynthesis: Solar Fuels Special Feature

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9

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Long-lived ET state in nanosized silica-alumina [Chemistry] (2012)

Fukuzumi, S., Doi, K., Itoh, A., Suenobu, T., Ohkubo, K., Yamada, Y., Karlin, K. D.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2012-09-26

Description: A simple donor-acceptor linked dyad, 9-mesityl-10-methylacridinium ion (Acr+-Mes) was incorporated into nanosized mesoporous silica-alumina to form a composite, which in acetonitrile is highly dispersed. In this medium, upon visible light irradiation, the formation of an extremely long-lived electron-transfer state (Acr•-Mes•+) was confirmed by EPR and laser flash photolysis spectroscopic methods....

Keywords: Chemical Approaches to Artificial Photosynthesis: Solar Fuels Special Feature

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10

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Photodriven oxidation of a water-oxidation catalyst [Chemistry] (2012)

Vagnini, M. T., Smeigh, A. L., Blakemore, J. D., Eaton, S. W., Schley, N. D., D'Souza, F., Crabtree, R. H., Brudvig, G. W., Co, D. T., Wasielewski, M. R.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2012-09-26

Description: Photodriving the activity of water-oxidation catalysts is a critical step toward generating fuel from sunlight. The design of a system with optimal energetics and kinetics requires a mechanistic understanding of the single-electron transfer events in catalyst activation. To this end, we report here the synthesis and photophysical characterization of two...

Keywords: Chemical Approaches to Artificial Photosynthesis: Solar Fuels Special Feature

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11

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Calculation of thermodynamic hydricities [Chemistry] (2012)

Muckerman, J. T., Achord, P., Creutz, C., Polyansky, D. E., Fujita, E.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2012-09-26

Description: We have developed a correlation between experimental and density functional theory-derived results of the hydride-donating power, or “hydricity”, of various ruthenium, rhenium, and organic hydride donors. This approach utilizes the correlation between experimental hydricity values and their corresponding calculated free-energy differences between the hydride donors and their conjugate acceptors in...

Keywords: Chemical Approaches to Artificial Photosynthesis: Solar Fuels Special Feature

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12

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Cobalt-dithiolene complexes for proton reduction. [Chemistry] (2012)

Mc; Namara, W. R., Han, Z., Yin, C.-J., Brennessel, W. W., Holland, P. L., Eisenberg, R.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2012-09-26

Description: Artificial photosynthesis (AP) is a promising method of converting solar energy into fuel (H2). Harnessing solar energy to generate H2 from H+ is a crucial process in systems for artificial photosynthesis. Widespread application of a device for AP would rely on the use of platinum-free catalysts due to the scarcity...

Keywords: Chemical Approaches to Artificial Photosynthesis: Solar Fuels Special Feature

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13

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Visible light generation of I-I bonds [Chemistry] (2012)

Farnum, B. H., Jou, J. J., Meyer, G. J.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2012-09-26

Description: Seven Ru-tris(diimine) compounds were prepared to study the photooxidation of iodide. Iodide oxidation results in the formation of I–I bonds, and it is therefore relevant to the conversion and storage of solar energy. Iodide oxidation is also a key step for electrical power generation in dye-sensitized solar cells. The mechanistic...

Keywords: Chemical Approaches to Artificial Photosynthesis: Solar Fuels Special Feature

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Drilling for microbes [Inner Workings] (2013)

Zeliadt, N.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2013-02-13

Description: pnas;110/7/2434/UNFIG01F1unfig01The scientific ocean drilling vessel JOIDES Resolution features an ∼7-meter-diameter moon pool. Image courtesy of William Crawford (Integrated Ocean Drilling Program, Texas A&M University, College Station, TX).For scientists who study subseafloor sediment, it’s not unusual to spend a lot of time at sea aboard a ship with a gaping hole...

Keywords: Inner Workings

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15

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Testing for executive function in gibbons [Inner Workings] (2014)

Frederick, R.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2014-04-02

Description: It is a commonly held assumption that we humans have a unique thinking ability that distinguishes us from other animals. However, every time scientists have tested that assumption—whether testing for self-recognition in a mirror, the existence of language, problem-solving ability, knowing what another is thinking (or “theory of mind”), deception,...

Keywords: Inner Workings

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16

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Controlling flies with lasers [Inner Workings] (2014)

Williams, S. C. P.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2014-10-29

Description: Inside a two-centimeter-wide pen, a male and female fruit fly dance around each other, performing the careful steps of courtship. However, as the male Drosophila melanogaster begins to approach the female, he crosses an invisible line six millimeters away from the object of his dance. A laser, its beam barely...

Keywords: Inner Workings

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17

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Inner Workings: Roboclam [Inner Workings] (2014)

Cofield, C.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2014-10-22

Description: Digging in the sand might seem like child's play, but doing it efficiently has stumped many adult engineers. As is often the case, nature has revealed a superior solution: this time in the Atlantic razor clam, which can burrow into and out of sandy ocean bottoms more efficiently than man-made,...

Keywords: Inner Workings

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18

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The first rabies vaccination in humans [Inner Workings] (2014)

Rappuoli, R.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2014-08-27

Description: The first human vaccination with a rabies virus attenuated by exposure to dry air started on July 6, 1885, and was reported in the session of the French Academy of Sciences on October 26, 1885 (1). In his report, Louis Pasteur describes how experiments started in 1882 led him to...

Keywords: Inner Workings

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19

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The strictest biosafety [Inner Workings] (2014)

Dance, A.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2014-09-10

Description: In a small town in the middle of Montana, biologists handle deadly pathogens such as Ebola. Hamilton, with a population of about 4,500, hosts the National Institute of Allergy and Infectious Diseases’ Rocky Mountain Laboratories, one of a few dozen facilities worldwide equipped to deal with disease agents designated the...

Keywords: Inner Workings

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A soft robot that swims like a fish [Inner Workings] (2014)

Ornes, S.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2014-12-17

Description: The creature that inhabits a 90-gal tank in the laboratory of Massachusetts Institute of Technology (MIT) computer scientist Daniela Rus looks, moves, and turns like a real fish, although it will never need food, fresh water, or a fake coral reef to stay entertained. It does require a fresh canister...

Keywords: Inner Workings

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21

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After-hours coding on the big screen [Inner Workings] (2014)

Frederick, R.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2014-10-15

Description: It wasn’t exactly sneaking in. Matthew Turk and Jeff Oishi were authorized to use the visualization laboratory at the Kavli Institute for Particle Astrophysics and Cosmology (KIPAC) in Stanford, California, but that’s how Turk remembers it: “We snuck in after hours and repurposed it.” After hours at the KIPAC visualization...

Keywords: Inner Workings

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22

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Mother's milk mysteries [Inner Workings] (2014)

Frederick, R.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2014-05-21

Description: Mothers’ milk is so widely available and so important to babies’ development that it seems unthinkable it would hold any remaining mysteries. However, most milk researchers study the milk of other animals, seek to improve the formula for milk substitutes, or focus on what happens to mammary glands when they...

Keywords: Inner Workings

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23

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Face processing and the Greebles [Inner Workings] (2014)

Katsnelson, A.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2014-07-16

Description: Meet the Greebles, a computer-generated clan of what psychologists descriptively call “novel objects.” For more than 15 years, they have served as foot-soldiers in one of the most divisive debates in cognitive neuroscience: Does making sense of faces require specialized brain machinery, or is the hardware and software the same...

Keywords: Inner Workings

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24

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Sequencing ancient DNA [Inner Workings] (2014)

Nair, P.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2014-02-19

Description: The quest to trace the roots of the human race has long rested on the tools of molecular biology. Researchers have long peered into our evolutionary history in the sequences of ancient DNA extracted from skeletal remains unearthed by archaeologists. For example, sequencing the DNA of 40,000-year-old remnants of an...

Keywords: Inner Workings

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Raising yellow tang [Inner Workings] (2014)

Williams, S. C. P.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2014-07-02

Description: Chatham Callan squints into a 200-liter tank of water. “You have to really look hard to see the little specks in there,” he says. “Those guys just hatched yesterday.” White dots the size of a pinhead float in the water; they’re day-old yellow tang, saltwater fish that are among the...

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26

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Corn syrup mantle plumes [Inner Workings] (2014)

Choi, C.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2014-03-12

Description: In the dark, microscopic plastic beads in the 200-gallon tank of corn syrup glow and sparkle when light from a projector shines at them in geophysical fluid dynamicist Christopher Kincaid’s laboratory at the University of Rhode Island. Experiments with this goo could help explain whether columns of magma rising up...

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The genetic code [Inner Workings] (2014)

Marshall, J.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2014-04-23

Description: After the double-helical structure of DNA was revealed in 1953, researchers had before them the chance to unlock an utterly compelling puzzle, one for the ages and fundamental to the processes of life: What code linked DNA sequences to each of the 20 amino acids that comprised proteins? Every biology...

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28

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Mongolian tree rings [Inner Workings] (2014)

Venton, D.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2014-11-19

Description: A centuries old lava flow, spreading from the base of the now dormant Khorgo volcano in Central Mongolia, seems an unlikely place to find history lessons. However, on spotting it, Amy Hessl wanted to explore. In this lava flow, Hessl supposed, could be clues to how, many centuries ago, a...

Keywords: Inner Workings

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Breaking down bees' dances [Inner Workings] (2014)

Shen, H. H.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2014-11-12

Description: Worker bees in the United Kingdom have taken a new job—collecting data for researchers at the University of Sussex. Margaret Couvillon and her colleagues have devised an environmental monitoring system that uses foraging honey bees and their “waggle” dances to measure land quality. The technique could help scientists assess the...

Keywords: Inner Workings

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Discovering the split mind [Inner Workings] (2014)

Shen, H. H.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2014-12-24

Description: Seeing is believing but the results seemed hard to fathom. In 1962, scientists observed an epilepsy patient named W.J. as he attempted to complete a seemingly simple task: manipulate a set of painted blocks to match a specific pattern. Strangely, he could only execute the task with his left hand,...

Keywords: Inner Workings

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31

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Whole-climate experiments for peatlands [Inner Workings] (2013)

Ornes, S.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2013-06-05

Description: A series of boardwalks form a framework for future enclosures that will sustain modified climates to see the effects on the peatland ecosystem. Image courtesy of Paul J. Hanson. The US Department of Agriculture Forest Service Marcell Experimental Forest covers 890 hectares in northern Minnesota, less than 100 miles south...

Keywords: Inner Workings

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Studying volcanic eruptions with aerial drones [Inner Workings] (2013)

Williams, S. C. P.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2013-07-03

Description: Drones like the one shown being launched are making the detailed investigation of volcanic eruptions and lava flows possible. Image courtesy of David Pieri. In 1984, the volcano Mauna Loa erupted in Hawaii, sending ribbons of lava winding down its slopes. Geologist and former pilot David Pieri of the California...

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Northern hibernaculum [Inner Workings] (2013)

Ornes, S.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2013-07-10

Description: A facility in northern Maine provides a home for hibernating bats. Researchers are using this cave to try to solve the problem of White Nose Syndrome. Image courtesy of Steve Agius. For years, biologist Susi von Oettingen at the US Fish and Wildlife Service tracked the devastation in New England...

Keywords: Inner Workings

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Seeing sea spray by the seashore [Inner Workings] (2013)

Powell, D.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2013-06-12

Description: The ocean-atmosphere wave flume (33 × 0.5 × 1 m) facility at Scripps Institution of Oceanography, University of California, San Diego. Surfers aren't the only ones chasing the perfect wave in California. After more than a year spent refurbishing an old metal tank, atmospheric chemist Kimberly Prather can recreate in...

Keywords: Inner Workings

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35

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Immersive visualization [Inner Workings] (2013)

Williams, S. C. P.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2013-03-20

Description: When you’re standing in the middle of Stony Brook University’s Reality Deck looking at a world map, you can see the organization of the continents that surround you—literally. Covering the four walls—and even the door—of the cave-like room are 416 27-inch screens containing a total of 1.5 billion pixels. If...

Keywords: Inner Workings

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36

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Imaging permafrost [Inner Workings] (2013)

Williams, S. C. P.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2013-04-24

Description: pnas;110/17/6611/UNFIG01F1unfig01Susan Hubbard tugs a ground-penetrating radar device attached to skis across the Arctic permafrost to get measurements of the frozen ground below. Image courtesy of Susan Hubbard.Last October, when Susan Hubbard and her team pulled sleds full of sensitive sensors across the snow near the northernmost point in Alaska, temperatures...

Keywords: Inner Workings

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37

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Radio tagging Burmese pythons [Inner Workings] (2013)

Nair, P.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2013-05-15

Description: pnas;110/20/7963/UNFIG01F1unfig01A Burmese python undergoes surgical implantation of a radiotransmitter. Image courtesy of Tony Mills.If, as the ancient Greek myth holds, the serpent god Ophion once reigned supreme over Mount Olympus, Burmese pythons in southern Florida are now living up to the spirit of the lore. Constrictor snakes from southern Asia...

Keywords: Inner Workings

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38

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3D viewing in the deep sea [Inner Workings] (2013)

Schrope, M.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2013-05-22

Description: A team from WHOI uses a new super high-resolution panoramic camera system affixed to a small remotely operated vehicle to explore a coral reef in Palau. Image courtesy of Bill Lange. A new multicamera system enables unprecedented panoramic video feeds from remotely operated vehicles (ROVs) used to explore the deep...

Keywords: Inner Workings

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39

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Studying an elusive cuckoo [Inner Workings] (2013)

Williams, S. C. P.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2013-05-29

Description: A video camera caught this image of two couples of Greater Ani cuckoos sharing a nest. Image courtesy of Christina Riehl. In a single nest, perched on a branch overhanging a marshy river in Panama, four birds jostle for space. The birds all belong to a species of cuckoo called...

Keywords: Inner Workings

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40

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Theoretical physicists' blackboards [Inner Workings] (2013)

Ornes, S.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2013-11-20

Description: William Donnelly discusses the details of a phenomenon known as the Unruh Effect with colleagues on a public-space blackboard at Perimeter Institute for Theoretical Physics. Image courtesy of Perimeter Institute. The almighty blackboard. At some institutions, it is becoming a relic, gone the way of the Dodo, replaced by a...

Keywords: Inner Workings

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41

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Sea star wasting [Inner Workings] (2014)

Schrope, M.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2014-05-14

Description: In June of last year, researchers got the first report that sea stars in Washington’s Olympic National Park were succumbing to a new disease outbreak. By August, stars were falling off the rocks—dead by the thousands—at Vancouver Island. “That’s the point at which we started getting samples and alerting people,”...

Keywords: Inner Workings

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42

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Spraying to see cancer cells [Inner Workings] (2014)

Williams, S. C. P.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2014-06-11

Description: In a Stanford University operating room, surgeons peer into the abdomen of a patient, scalpels delicately dancing under the bright lights. They’re removing a gastric tumor, hoping they can cut away every cancerous cell. Just outside the operating room, an unlikely group waits to lend a hand: they’re not medical...

Keywords: Inner Workings

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43

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Splitting CO2 into CO and O2 by a single catalyst [Chemistry] (2012)

Chen, Z., Concepcion, J. J., Brennaman, M. K., Kang, P., Norris, M. R., Hoertz, P. G., Meyer, T. J.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2012-09-26

Description: The metal complex [(tpy)(Mebim-py)RuII(S)]2+ (tpy = 2,2′ : 6′,2′′-terpyridine; Mebim-py = 3-methyl-1-pyridylbenzimidazol-2-ylidene; S = solvent) is a robust, reactive electrocatalyst toward both water oxidation to oxygen and carbon dioxide reduction to carbon monoxide. Here we describe its use as a single electrocatalyst for CO2 splitting, CO2 → CO + 1/2 O2, in a two-compartment electrochemical cell.

Keywords: Chemical Approaches to Artificial Photosynthesis: Solar Fuels Special Feature

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44

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Water splitting in dye-sensitized solar cells [Chemistry] (2012)

Zhao, Y., Swierk, J. R., Megiatto, J. D., Sherman, B., Youngblood, W. J., Qin, D., Lentz, D. M., Moore, A. L., Moore, T. A., Gust, D., Mallouk, T. E.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2012-09-26

Description: Photoelectrochemical water splitting directly converts solar energy to chemical energy stored in hydrogen, a high energy density fuel. Although water splitting using semiconductor photoelectrodes has been studied for more than 40 years, it has only recently been demonstrated using dye-sensitized electrodes. The quantum yield for water splitting in these dye-based systems...

Keywords: Chemical Approaches to Artificial Photosynthesis: Solar Fuels Special Feature

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45

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Mimicking PS II electron transfer [Chemistry] (2012)

Megiatto, J. D., Antoniuk-Pablant, A., Sherman, B. D., Kodis, G., Gervaldo, M., Moore, T. A., Moore, A. L., Gust, D.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2012-09-26

Description: In the photosynthetic photosystem II, electrons are transferred from the manganese-containing oxygen evolving complex (OEC) to the oxidized primary electron-donor chlorophyll P680•+ by a proton-coupled electron transfer process involving a tyrosine-histidine pair. Proton transfer from the tyrosine phenolic group to a histidine nitrogen positions the redox potential of the tyrosine...

Keywords: Chemical Approaches to Artificial Photosynthesis: Solar Fuels Special Feature

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46

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H2 evolution: [Ni(P2N2)2]2+ in acidic ionic liq./H2O [Chemistry] (2012)

Pool, D. H., Stewart, M. P., O'Hagan, M., Shaw, W. J., Roberts, J. A. S., Bullock, R. M., Du; Bois, D. L.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2012-09-26

Description: The electrocatalytic reduction of protons to H2 by (where in the highly acidic ionic liquid dibutylformamidium bis(trifluoromethanesulfonyl)amide shows a strong dependence on added water. A turnover frequency of 43,000–53,000 s-1 has been measured for hydrogen production at 25 °C when the mole fraction of water (χH2O) is 0.72. The same catalyst in...

Keywords: Chemical Approaches to Artificial Photosynthesis: Solar Fuels Special Feature

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47

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Insights into proton-coupled electron transfer mechanisms of electrocatalytic H2 oxidation and production [Chemistry] (2012)

Horvath, S., Fernandez, L. E., Soudackov, A. V., Hammes-Schiffer, S.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2012-09-26

Description: The design of molecular electrocatalysts for H2 oxidation and production is important for the development of alternative renewable energy sources that are abundant, inexpensive, and environmentally benign. Recently, nickel-based molecular electrocatalysts with pendant amines that act as proton relays for the nickel center were shown to effectively catalyze H2 oxidation...

Keywords: Chemical Approaches to Artificial Photosynthesis: Solar Fuels Special Feature

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48

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Power curves for artificial leaves [Chemistry] (2012)

Surendranath, Y., Bediako, D. K., Nocera, D. G.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2012-09-26

Description: An artificial leaf can perform direct solar-to-fuels conversion. The construction of an efficient artificial leaf or other photovoltaic (PV)-photoelectrochemical device requires that the power curve of the PV material and load curve of water splitting, composed of the catalyst Tafel behavior and cell resistances, be well-matched near the thermodynamic potential...

Keywords: Chemical Approaches to Artificial Photosynthesis: Solar Fuels Special Feature

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49

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Artificial photosynthesis of CO [Chemistry] (2012)

Smieja, J. M., Benson, E. E., Kumar, B., Grice, K. A., Seu, C. S., Miller, A. J. M., Mayer, J. M., Kubiak, C. P.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2012-09-26

Description: The effective design of an artificial photosynthetic system entails the optimization of several important interactions. Herein we report stopped-flow UV-visible (UV-vis) spectroscopy, X-ray crystallographic, density functional theory (DFT), and electrochemical kinetic studies of the Re(bipy-tBu)(CO)3(L) catalyst for the reduction of CO2 to CO. A remarkable selectivity for CO2 over H+...

Keywords: Chemical Approaches to Artificial Photosynthesis: Solar Fuels Special Feature

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50

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Catalytic mechanism for water oxidation [Chemistry] (2012)

Lin, X., Hu, X., Concepcion, J. J., Chen, Z., Liu, S., Meyer, T. J., Yang, W.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2012-09-26

Description: Water oxidation is a linchpin in solar fuels formation, and catalysis by single-site ruthenium complexes has generated significant interest in this area. Combining several theoretical tools, we have studied the entire catalytic cycle of water oxidation for a single-site catalyst starting with [RuII(tpy)(bpm)(OH2)]2+ (i.e., [RuII-OH2]2+; tpy is 2,2′∶6′,2′′-terpyridine and bpm...

Keywords: Chemical Approaches to Artificial Photosynthesis: Solar Fuels Special Feature

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51

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Catalytic hydrogen evolution [Chemistry] (2012)

Valdez, C. N., Dempsey, J. L., Brunschwig, B. S., Winkler, J. R., Gray, H. B.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2012-09-26

Description: A dicobaloxime in which monomeric Co(III) units are linked by an octamethylene bis(glyoxime) catalyzes the reduction of protons from p-toluenesulfonic acid as evidenced by electrocatalytic waves at -0.4 V vs. the saturated calomel electrode (SCE) in acetonitrile solutions. Rates of hydrogen evolution were determined from catalytic current peak heights (kapp = 1100 ± 70 M-1 s-1). Electrochemical...

Keywords: Chemical Approaches to Artificial Photosynthesis: Solar Fuels Special Feature

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52

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Charge carrier dynamics in hematite photoanodes [Chemistry] (2012)

Barroso, M., Mesa, C. A., Pendlebury, S. R., Cowan, A. J., Hisatomi, T., Sivula, K., Gratzel, M., Klug, D. R., Durrant, J. R.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2012-09-26

Description: This paper addresses the origin of the decrease in the external electrical bias required for water photoelectrolysis with hematite photoanodes, observed following surface treatments of such electrodes. We consider two alternative surface modifications: a cobalt oxo/hydroxo-based (CoOx) overlayer, reported previously to function as an efficient water oxidation electrocatalyst, and a...

Keywords: Chemical Approaches to Artificial Photosynthesis: Solar Fuels Special Feature

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53

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Mass transport in Si wire-array photoelectrodes [Chemistry] (2012)

Xiang, C., Meng, A. C., Lewis, N. S.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2012-09-26

Description: Physical integration of a Ag electrical contact internally into a metal/substrate/microstructured Si wire array/oxide/Ag/electrolyte photoelectrochemical solar cell has produced structures that display relatively low ohmic resistance losses, as well as highly efficient mass transport of redox species in the absence of forced convection. Even with front-side illumination, such wire-array based...

Keywords: Chemical Approaches to Artificial Photosynthesis: Solar Fuels Special Feature

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54

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Photosystems by ruthenium oxo and native systems [Chemistry] (2012)

Tanaka, K., Isobe, H., Yamanaka, S., Yamaguchi, K.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2012-09-26

Description: The nature of chemical bonds of ruthenium(Ru)–quinine(Q) complexes, mononuclear [Ru(trpy)(3,5-t-Bu2Q)(OH2)](ClO4)2 (trpy = 2,2′:6′,2′′-terpyridine, 3,5-di-tert-butyl-1,2-benzoquinone) (1), and binuclear [Ru2(btpyan)(3,6-di-Bu2Q)2(OH2)]2+ (btpyan = 1,8-bis(2,2′:6′,2′′-terpyrid-4′-yl)anthracene, 3,6-t-Bu2Q = 3,6-di-tert-butyl-1,2-benzoquinone) (2), has been investigated by broken-symmetry (BS) hybrid density functional (DFT) methods. BS DFT computations for the Ru complexes have elucidated that the closed-shell structure (2b) Ru(II)–Q complex is less stable than...

Keywords: Chemical Approaches to Artificial Photosynthesis: Solar Fuels Special Feature

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Spinning silk from spiders [Inner Workings] (2013)

Choi, C.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2013-09-04

Description: Sarah Strauss harvesting silk from a spider. Photo courtesy of Malte Fliess. In the laboratory, biologist Sarah Strauss finds it easy to catch spiders using clear little boxes: The golden orb-weavers, whose webs shine golden in the sunlight, are typically very sedate, and in any case are used to being...

Keywords: Inner Workings

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Avian acrobatics [Inner Workings] (2013)

Nair, P.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2013-04-17

Description: pnas;110/16/6245/UNFIG01F1unfig01Researchers record a hummingbird lifting a string of small weights to determine the bird’s muscle power. Image courtesy of Doug Altshuler, Team Hummingbird.As flying vertebrates go, hummingbirds are veritable humdingers. Featherweight members of the vertebrate subphylum, some species of hummingbirds can thrive at heights of 5,000 meters above sea level,...

Keywords: Inner Workings

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57

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Filming chimpanzee gestures [Inner Workings] (2013)

Ravindran, S.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2013-02-27

Description: pnas;110/9/3208/UNFIG01F1unfig01Individuals from the Sonso community of chimpanzees groom each other, as a researcher films them to capture the gestures they use to communicate. Image courtesy of Liran Samuni.The Sonso community of chimpanzees has its own reality television show. However, the show isn’t on any cable network; it’s for the benefit...

Keywords: Inner Workings

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58

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Vacuuming rocks [Inner Workings] (2013)

Venton, D.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2013-03-06

Description: pnas;110/10/3709/UNFIG01F1unfig01Researchers vacuum myriad tiny, swimming creatures from the surface of rocks off the coast of Southern Italy. Image courtesy of Kristy Kroeker.Kristy Kroeker vacuums invertebrates from a rock off the coast of Southern Italy. Her SCUBA-tank powered vacuum, called an “airlift,” inhales shrimp, sand fleas, marine worms, and “things that...

Keywords: Inner Workings

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Fossil-hunting in billion-dollar holes [Inner Workings] (2013)

Frederick, R.

National Academy of Sciences

In: PNAS - Proceedings of the National Academy of Sciences

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Publication Date: 2013-12-25

Description: At the northern tip of Colombia, Jonathan Bloch hunts for fossils in the midst of spontaneous combustion fires, noxious gases laced with foul-smelling sulfur, rock-shattering explosions, and some of the largest machines in the world. Fires start spontaneously in Latin America's largest coal mine, where Jonathan Bloch (Right) and a...

Keywords: Inner Workings

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