A term in earth science: Great Oxidation Event

The atmosphere of today's Earth contains about 21% of oxygen (O₂). Early in its history, the anoxic Hadean Earth—as it is scientifically proposed to have been existed around 4.4 billion years ago—had no interface of life-supporting oxygen. The Great Oxidation Event (GOE), which has been suggested to have occurred at the end of the Paleoproterozoic Era more than two billion years ago, was the time when some amount of free oxygen surfaced into the atmosphere. The appearance of the first atmospheric oxygen molecules was biologically and geologically induced. Then, photosynthetically produced oxygen paved the way for advancing forms of life and triggered the coevolution of the biosphere and the geosphere [1-3]. From the GOE onwards, Earth's atmosphere and oceans became oxygenated over time in stages [4].

The details of how atmospheric oxygen first rose to significant levels remain lost in geologic time. But ideas and answers are found by searching for fossiliferous formations such as ancient sandstone, black chert, black shale and stromatolites. Based on microbial mat fossils and fossil biomolecules, found in such deposits, researchers are looking for clues to understand the photobiochemistry of early organisms and possible routes of oxygen production. For example, fieldwork by Nora Noffke and others has turned up microbially induced sedimentary structures (MISS), including 3.48-billion-year-old MISS—the oldest ever reported [5].

An interesting aspect of this geobiological research is the interdependent, natural occurrence of organic and inorganic chemical processes throughout most of Earth's history. Robert M. Hazen and Dimitri Sverjensky argue that biodiversity and mineral diversity developed closely interlocked after oxygen became available within Earth's near surface environment [1]:

Our  recent chemical modeling suggests that the Great Oxidation Event paved the way for as many as three thousand minerals, all of them species previously unknown in our Solar System. Hundreds of new chemical compounds of uranium, nickel, copper, manganese, and mercury arose only after life learned its oxygen-producing trick. Many of the most beautiful crystal specimens in museums—blue-green copper minerals, purple cobalt species, yellow-orange uranium ores, and others—speak powerfully of a vibrant living world. These newly minted minerals are unlikely to form in an anoxic environment, so life appears to be responsible, directly or indirectly, for most of Earth's forty-five hundred known mineral species. Remarkably, some of these new minerals provided evolving life with new environmental niches and new sources of chemical energy, so life has continuously coevolved with the rocks and minerals.

Snapshots of the intertwined stories of our early home planet are now coming in view, thanks to groundbreaking discoveries. Will those results help us to understand and reconstruct the evolution of other planets and their moons in the solar system and beyond? Was the Great Oxidation Event a singularly Earth-bound affair?

Other terms for the Great Oxidation Event: Great Oxygenation Event, Oxygen Catastrophe, Oxygen Crisis, Oxygen Revolution and Great Oxidation.

Keywords: geophysics; planetary science; solar system; paleontology; mineralogy; paleochemistry; photosynthesis. 

References and more to explore
[1] Robert M. Hazen: The Story of Earth. The First 4.5 Billion Years, from Stardust to Living Planet. Penguin Books, New York, 2012; see page 180 and others.
[2] Robert M. Hazen: Mineral Evolution [hazen.gl.ciw.edu/research/mineral-evolution].
[3] Dimitri A. Sverjensky: Mineral Evolution [www.jhu.edu/~dsverje1].
[4] Heinrich D. Holland: The oxygenation of the atmosphere and oceans. Phil. Trans. R. Soc. B 2006, 361. DOI: 10.1098/rstb.2006.1838 [rstb.royalsocietypublishing.org/content/361/1470/903.full.pdf].
[5] Jim Raper: Geobiologist Noffke Reports Sign of Life that Are 3.48 Billion Years Old [www.odu.edu/about/odu-publications/insideodu/2013/11/11/topstory1].

Crane nomenclature borrowing from equine nomenclature

Female cranes are known as mares, male cranes are known as roans and the chicks are known as colts [1,2].

Commonly, the term mare is associated with an adult female horse. The term roan refers to a particular color pattern—a mixture of white and color (for example, white or gray sprinkles on a brown coat)—found in animals such as horses and dogs. A horse showing this coat color pattern is called a roan. 

Somehow, these terms made it from the equine into crane terminology. Alex Shoumatoff notes (page 59 in [2]):

For some reason crane nomenclature is borrowed from horse terms. A mother crane is called a mare, the dads are roans. The terminology sounds like it was created out West.

Keywords: biology, ornithology, terminology, male, female.

References and more to explore
[1] Kachemak Crane Watch: SandHill Cranes, August 20, 2008 [cranewatch.org:8080/Cranewatch/news/sandhill-cranes].
[2] Alex Shoumatoff: Flight Club. Smithsonian March 2014, 44 (11), pp. 54-67.

The three- and four-syllable version of a chemical element name: alumin(i)um

Common ores of the metal aluminum are bauxite and alumina. The English chemist and inventor Sir Humphry Davy christened the metal, which he tried to isolate, after alumina. In 1807, he named the chemical element alumium and then changed the name to aluminum [1,2].  To conform with the “ium” ending of most elements, the name aluminium was adopted in 1812, after an anonymous reviewer objected Davy's naming suggestion in the Quarterly Review. But the reviewer forgot about platinum, molybdenum and tantalum—elements with names that also ended in “um”, like aluminum, without a leading letter “i” [2].

Hugh Aldersey-Williams has more to say about the spelling episode of alumin(i)um [2]:

America and France may have pioneered the development of aluminium, but they disagreed over its spelling. Even the great editor H. L. Mencken is at loss to explain this. In the American Language he is forced to confess: ‘How aluminium, in America, lost its fourth syllable I have been unable to determine, but all American authorities now make it aluminum and all English authorities stick to aluminium.’ Other sources suggest it may have been the doing of Charles Hall. The patents he took out while his commercial publicity material touted the merits of  ‘aluminum’, whether by intent or typographical error is not known. The shorter word spread and stuck in the United States; in France, Britain and the rest of Europe, the extra syllable remained.

The extra syllable was also around in the U.S. until 1925 [1]. Then the American Chemical Society officially decided to use the name aluminum in their publications. Ever since, scientists and engineers are doomed to live with a dual spelling policy for alumin(i)um—switching between aluminum and aluminium depending on which journals they read and where they publish. Fortunately, the element symbol Al is undisputed!

Keywords: chemical element, renaming, history, orthography, typography.

References and more to explore
[1] David R. Lide (Editor): Handbook of Chemistry and Physics. CRC Press, Boca Raton, 88th Edition 2007-2008; page 4-3.
[2] Hugh Aldersey-Williams: Periodic Tales: a cultural history of the elements, from arsenic to zinc. Harper-Collins Publisher, New York, NY 10022, 2011; page 260 [www.harpercollins.com/Srch/index.aspx?search=periodic tales].

The aluminum-ore bauxite, named after the village of Les Baux in Provence, France

Les Baux is a small town near St. Reny in the Bouches-du-Rhône department of the province of Provence in southwest France. Les Baux-de-Provence, as this beautiful and scenic village is often named, is a listed heritage site located in the heart of the Alpilles regional country park [1]. Near Les Baux, the ore bauxite was first discovered in 1821 by the geologist Pierre Berthier [2]. In 1847, Armand Dufrénoy named the ore beauxite. In 1861, Henri Sainte-Claire Deville, who discovered a method to separate kilogram amounts of aluminum from the ore's Al-containing constituents böhmite (γ-AlO(OH)), diaspore (α-AlO(OH)) and gibbsite (Al(OH)3), renamed the ore to bauxite [3].

Hugh Aldersey-Williams summarizes the isolation of aluminum (moniker: silver from clay) from bauxite and the metal's usefulness in his Periodic Tales as follows [4]:

This now ubiquitous material—as vital to us as steel and more visible than any of the metals known in antiquity—was only isolated as recently as the 1820s, and it was not until the 1850s that an even remotely commercial way was found to separate it from its ore, bauxite, named after Les Baux in Provence, where it is still possible to see the bleached quarry works on the hill above the town. The process developed by Henri Sainte-Claire Deville in Paris involved heating compounds of aluminium with sodium metal, which was itself exceptionally hard to obtain, and this made his aluminium hugely expensive. Though it scarcely seems credible now, aluminium was hailed as a new precious metal to be placed along with gold and silver—its sheer cost and exoticism compensating for its low density and diffuse shine—and it was worked and flaunted in ways that reflected this status.

Today, the sound of the ore name bauxite can be recognized in many languages—with language-specific variations mostly limited to spelling:

• Danish: bauxit
• Dutch: bauxiet
• Finnish: bauksiitti
• German: Bauxit
• Italian: bauxite
• Polish: boksyt
• Portuguese: bauxita (or bauxite)
• Spanish: bauxita

Keywords: mineral name, renaming, place name, locality, aluminium ore, aluminum ore, quarry works, metallurgy, mining, history.

References and more to explore
[1] Les Beaux-de-Provence: One of the most beautiful villages in France [www.lesbauxdeprovence.com/en].
[2] Fact Index: Bauxite [www.fact-index.com/b/ba/bauxite.html].
[3] alu: Bauxite & alumina history [bauxite.world-aluminium.org/mining/process.html].
[4] Hugh Aldersey-Williams: Periodic Tales: a cultural history of the elements, from arsenic to zinc. Harper-Collins Publisher, New York, NY 10022, 2011; page 255 [www.harpercollins.com/Srch/index.aspx?search=periodic tales].

An anagram for LOVE: the word VOLE

Voles are small, mouse-size mammals closely related to other rodents such as lemmings. Voles are famously monogamous [1]. The prairie vole, for example, is an animal model for studying monogamous behavior and pair bonding. However, love-making and romance do not always translate simply into a granted male-female relation—at least not from a scientific viewpoint. Abigail Tucker, in a recent Smithsonian article, disclosed a dirty little secret [2]: “Prairie voles are socially, but not sexually, monogamous.”

Voles—like other mammals, including humans—exhibit the phenomenon of opportunistic infidelity. Some call it side-stepping, others cheating. And anthropologists have always known that monogamy is not the default condition in human cultures and civilization. The behavior of rejecting a recent and yearning for a new sex partner is dubbed the Coolidge Effect, based on an anecdotal story about John Calvin Coolidge, the 30th President of the United States, visiting a rooster & hen farm [3].

Interestingly, a lot of chemistry is behind how our (and the voles) bonding impulses are switched and wired: it has been found that natural variations in the DNA sequence of the vasopressin receptor gene determine the occurrence of neurochemical receptors in certain brain areas and thus the quality of monogamous or polygynous interaction [2,4]. Non-coding DNA, once misnamed “junk DNA,” plays a significant role in sexual programming.

Prairie vole studies demonstrate that brain chemicals are critical and effective communicators in regulating love, bonding and child care. The chemical messenger compound oxytocin—known as a hormone regulating social-cue perception, childbirth and maternal bonding—and the hormone vasopressin are such chemical candidates that trigger partner bonding [2]:

When a female prairie vole received an oxytocin injection in her brain, she huddled with her partner more and formed stronger bonds. Another hormone, vasopressin, related to territoriality, has been found to promote pair-bonding in males. [...] If the hormones responsible for maternal behavior in females and territoriality in males were released during sex, they could foster this novel male-female bond. Prairie vole sex, for instance, involves an unusual amount of vaginal-cervical stimulation—probably an adapted behavior that triggers the oxytocin release normally associated with childbirth. Instead of bonding with a baby, the female bonds with her partner.

Beyond love: oxytocin—the lack of it—has also been linked with autism-spectrum disorder (ASD) [5].

Keywords: molecular biology, neuroscience, neurochemistry, monogamy, partnership, wanderers, anthropology.

References and more to explore
[1] Bob Yirka: Researchers find epigenetic factor in monogamy for voles. June 3, 2013 [phys.org/news/2013-06-epigenetic-factor-monogamy-voles.html].
[2] Abigail Tucker: Love. What can rodents tell us about why humans love? Smithsonian February 2014, 44 (10), pp. 42-49 [www.smithsonianmag.com/science-nature/what-can-rodents-tell-us-about-why-humans-love-180949441/].
[3] Marnia: The Coolidge Effect. June 23, 2005 [www.reuniting.info/science/coolidge_effect].
[4] JUNKDNA [youdontevenknowme.wordpress.com/2013/05/23/human-brains-are-built-to-fall-in-love/].
[5] Christopher Bergland: The Neurobiology of the “Love Hormone” Revealed. Psychology Today August 5, 2013 [www.psychologytoday.com/blog/the-athletes-way/201308/the-neurobiology-the-love-hormone-revealed].

Scirus Exitus

Scirus (scirus.com) is (was) a search engine serving the scientific community. Elsevier's subscription-free portal “Scirus for scientific information only” was designed for open access of the scientific literature including databases such as Arxiv (arxiv.org) and NCBI's Pubmed (ncbi.nlm.nih.gov/pubmed) and, in general, for documents under .edu, .org, .gov,.ac.uk as well as .com domains.

To ensure a smooth transition to alternative search solutions, the Scirus home page gives an early announcement of Scirus' retirement plan:

We are sad to say goodbye. Scirus is set to retire in early 2014. An official retirement date will be posted here as soon as it is determined.

Finding alternatives is never easy, once you have accustomed yourself to a particular service and its ins & outs. What might those alternatives be? Google Scholar for the Surface Web plus the diverse set of portals tailored to specific tasks and disciplines?

In chemistry, materials science and nanotechnology, for example, word-based text search has always been just one entry strategy to find documents, data and facts. In addition, the formulation of search requests by using compositional formulae or SMILES—special notations that allow substructure and similarity matching, supplementing string comparison—is routinely employed in data mining concerning chemical materials and molecular structures. The CurlySMILES language has been developed to annotate and communicate nanostructures. However, the success of such specialized formulation strategies depends on their priorly designated association with documents and their implementation into databases, archives, repositories and the World Wide Web.

In HTML5-based Web design, the integration of chemical microdata vocabularies such as Axeleratio's ChemId Vocabulary for chemical compound identification is a way to enhance the chemistry-aware Semantic Web. Encouragingly, the ThermoML project demonstrates that the cooperation between scientific institutions and journal publishers can set standards for open-access representation of data in a specific domain—thermodynamics, providing not only a base for task-driven data extraction, but also for chemical modeling as well as computer-assisted materials & process design. 

The science-oriented approach of Scirus stays alive—for everyone seeking scientific information! And the study and optimization of task-specific search strategies across language barriers is evolving into a science of its own.

Keywords: Scirus, Internet service, scientific search, semantic web, cheminformatics, data mining, content management, query formulation, search strategy.

Genoa in Nevada supposedly named after Genoa in Italy

Genoa seen from trail to Genoa Waterfall

Genoa was founded in 1851 by Mormon pioneers as a Utah Territory settlement (Nevada came into existence ten years later). It served as a trading post along the Emigrant Trail. By 1854 the Mormon Station, as it was called then, had a post office, a newspaper press, a school—and certainly a church and businesses [1-4]. The boundary between the Utah Territory and California was not yet clearly determined around that time. In 1854 Orson Hyde from Salt Lake City was sent by Mormon leader Brigham Young to survey the new Mormon frontier settlement. Billie Rightmire, Genoa town historian and fourth generation Genoan [3], writes that “Hyde changed the name of the surveyed town site to Genoa supposedly in honor of Christopher Columbus' birthplace, Genoa, Italy.”

The original Mormon fort was wiped out by a fire (started to fumigate a bedbug-infested mattress) in 1910 and Genoa lost its seat of Douglas County to nearby Minden in 1916 [4]. Nevertheless, the present replica of the trading post attracts daily sightseers and the humble settlement turned into one of the most attractive little villages in the American West, surrounded by an expansive system of scenic trails (including the Genoa Waterfall Trail, Sierra Canyon Trail and Discovery Trail) as well as golf courses and cattle ranches such as the River Fork Ranch, now owned and operated by The Nature Conservancy to benefit people and nature.

Keywords: history, geography, American West, place name.

References
[1] Town of Genoa: Town springs up from '49er trading post [www.genoanevada.org/history.htm].
[2] Margo Bartlett Pesek: Genoa, Nevada's oldest town, offers scenery, lots of history. Las Vegas Review-Journal, July 12, 2009. [www.reviewjournal.com/trip-week/genoa-nevadas-oldest-town-offers-scenery-lots-history].
[3] Billie J. Rightmire: History of Genoa [www.genoanevada.org/genoafounded.htm].
[4] David W. Toll: The Complete Nevada Traveler. The Affectionate and Intimately Detailed Guidebook to the most Interesting State in America. Gold Hill Publishing Company, Inc., Virginia City, Nevada, 2002; page 90.