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Down Under dinosaur burrow discovery provides climate change clues (7/14/2009)

Tags:
dinosaurs, cretaceous period, oryctodromeus cubicularis
Evidence of dinosaur burrows discovered in Australia comes on the heels of a similar finding in Montana, suggesting burrowing behaviors were shared by dinosaurs of different species, in different hemispheres, and spanned millions of years during the Cretaceous Period -- even in harsh polar environments.

'This research helps us to better understand long-term geologic change, and how organisms may have adapted as the Earth has undergone periods of global cooling and warming,' says paleontologist Anthony Martin, a senior lecturer in environmental studies at Emory University who discovered the Australian burrows. -  Drawing by James Hays, Fernbank Museum
Evidence of dinosaur burrows discovered in Australia comes on the heels of a similar finding in Montana, suggesting burrowing behaviors were shared by dinosaurs of different species, in different hemispheres, and spanned millions of years during the Cretaceous Period -- even in harsh polar environments. 'This research helps us to better understand long-term geologic change, and how organisms may have adapted as the Earth has undergone periods of global cooling and warming,' says paleontologist Anthony Martin, a senior lecturer in environmental studies at Emory University who discovered the Australian burrows. - Drawing by James Hays, Fernbank Museum

On the heels of his discovery in Montana of the first trace fossil of a dinosaur burrow, Emory University paleontologist Anthony Martin has found evidence of more dinosaur burrows - this time on the other side of the world, in Victoria, Australia. The find, to be published this month in Cretaceous Research, suggests that burrowing behaviors were shared by dinosaurs of different species, in different hemispheres, and spanned millions of years during the Cretaceous Period, when some dinosaurs lived in polar environments.

"This research helps us to better understand long-term geologic change, and how organisms may have adapted as the Earth has undergone periods of global cooling and warming," says Martin, a senior lecturer in environmental studies at Emory. Martin is also an honorary research associate at Monash University in Melbourne.

In 2006, in collaboration with colleagues from Montana State University and Japan, Martin identified the 95-million-year-old skeletal remains of a small adult dinosaur and two juveniles in a fossilized burrow in southwestern Montana. They later named the dinosaur species Oryctodromeus cubicularis, meaning "digging runner of the lair."

The researchers hypothesized that, besides caring for young in their dens, burrowing may have allowed some dinosaurs to survive extreme environments - throwing a wrench in some extinction theories.

'Where luck meets preparation'

A year after the Montana find, Martin traveled to the Victoria coast, which marks the seam where Australia once snuggled against Antarctica. Lower Cretaceous strata of Victoria have yielded the best-documented assemblage of polar dinosaur bones in the world.

During a hike to a remote site known as Knowledge Creek, west of Melbourne, Martin rounded the corner of an outcropping and was astounded to see, right at eye level, the trace fossil of what appeared to be a burrow almost identical to the one he had identified in Montana. "I stared at it for a long time," recalls Martin. "In paleontology, the saying, 'where luck meets preparation' really holds true."

The probable burrow etched into the Early Cretaceous outcrop is about six-feet long and one-foot in diameter. It gently descends in a semi-spiral, ending in an enlarged chamber. Martin later found two similar trace fossils in the same area.

Last period of global warming

The Victoria fossils are about 110 million years old, around the time that Australia split with Antarctica, and dinosaurs roamed in prolonged polar darkness along forested southern Australia river plains. It was one of the last times the Earth experienced global warming, with an average temperature of 68 degrees Fahrenheit - about 10 degrees higher than today.

During the polar winter, though, the temperature could plunge below freezing. Previously, researchers theorized that the small dinosaurs in the region survived harsh weather by sheltering beneath large tree roots or in hollows. Martin's find, however, indicates that they may have dug into the soft banks of rivers flowing out of the rift valley.

The age, size and shape of the likely burrows led Martin to hypothesize that they were made by small ornithopod dinosaurs - herbivores that were prevalent in the region. These ornithopods stood upright on their hind legs and were about the size of a large, modern-day iguana.

"It's fascinating to find evidence connecting a type of behavior between dinosaurs that are probably unrelated, and lived in different hemispheres during different times," Martin says. "It fills in another gap in our understanding of the evolution of dinosaurs, and ways they may have survived extreme environments."

An eye for subtle clues

A specialist in trace fossils - including tracks, scat and burrows - Martin is known for detecting subtle paleontology clues. He also identified the first tracks of a large, carnivorous dinosaur in Victoria, and the first fossil crayfish burrows from the same area.

Martin teaches a seminar at Emory on modern-day animal tracking, a skill that he says aids him in finding signs of prehistoric life. "It's important to do as much field work as possible, because it gives your mind a better library of search images," he says.

Evidence of dinosaur burrows discovered in Australia comes on the heels of a similar finding in Montana, suggesting burrowing behaviors were shared by dinosaurs of different species, in different hemispheres, and spanned millions of years during the Cretaceous Period -- even in harsh polar environments. 'This research helps us to better understand long-term geologic change, and how organisms may have adapted as the Earth has undergone periods of global cooling and warming,' says paleontologist Anthony Martin, a senior lecturer in environmental studies at Emory University and a research associate at Monash University in Melbourne, who discovered the Australian burrows. - Carol Clark and Anthony Martin, Emory University

Note: This story has been adapted from a news release issued by the Emory University

Comments:

1. smwdlego

12/16/2014 6:41:08 PM MST




five milioni di dollari in Milestone Pagamento da GSK per la promozione di ISIS
Carlsbad, California., three novembre 2014 / PRNewswire /, Inc. (ISIS) ha annunciato oggi di aver guadagnato 5 milioni di dollari pagamento pietra miliare dalla GSK relativo alla designazione di ISIS GSK5Rx come candidato di sviluppo. ISIS GSK5Rx è un farmaco antisenso progettato per trattare una malattia oculare riservate.
Isis Pharmaceuticals 'comunicato stampa lungimirante privacyQuesto comprende dichiarazioni previsionali in materia di Iside' alleanza strategica con GSK, e la scoperta, lo sviluppo, l'attività, potenziale terapeutico e commerciale e la sicurezza dei farmaci antisenso per il trattamento di malattie oculari. Qualsiasi dichiarazione che descrive gli obiettivi Isis ', aspettative, proiezioni finanziarie o di altro tipo, le intenzioni o convinzioni è una dichiarazione in attesa e deve essere considerato un rischio per la dichiarazione. Tali dichiarazioni sono soggette a rischi e incertezze, in particolare quelli inerenti al processo di scoperta, sviluppo e commercializzazione di farmaci che sono sicuri ed efficaci per l'uso come terapia umani, e nel tentativo di costruire un business enterprise attorno a tali farmaci. Dichiarazioni previsionali di Isis 'coinvolgono anche le ipotesi che, se non hanno mai materializzare o rivelarsi corretta, potrebbero far sì che i risultati differiscano materialmente da quelli espressi o impliciti in tali dichiarazioni previsionali. Sebbene le dichiarazioni previsionali di Isis 'riflettono il giudizio in buona fede della sua gestione, queste dichiarazioni sono basate solo su fatti e fattori attualmente conosciuti da Iside. Di conseguenza, si sono avvertiti di non fare affidamento su tali dichiarazioni previsionali. Questi e altri rischi relativi Isis 'i programmi sono descritti in maggiore dettaglio in Iside' relazione annuale sul Modulo ten K per l'anno conclusosi il 31 dicembre 2013, e la sua più recente relazione trimestrale su modulo ten Q, che sono registrati presso la SEC. Copie di questi e altri documenti sono disponibili presso la Società.
In questo comunicato stampa, a meno che il contesto non richieda una diversa, Iside, Società, noi, nostro e noi si riferisce toand sue controllate. è un marchio registrato di, Regulus Therapeutics Inc. è un marchio di Regulus Therapeutics Inc. KYNAMRO è un marchio registrato di Genzyme Corporation.
Isis sta sfruttando la propria posizione di leadership nella tecnologia antisenso per scoprire e sviluppare nuovi farmaci per la sua pipeline di prodotti e per i suoi partner. Ampia pipeline di Iside 'composto da 33 farmaci per il trattamento di una vasta gamma di malattie con l'accento sulla cardiovascolari, metaboliche, malattie gravi e uncommon, tra cui disturbi neurologici, e il cancro. Isis 'socio, Genzyme, sta commercializzando Isis' prodotto di punta, KYNAMRO, negli Stati Uniti e in altri paesi per il trattamento di pazienti con FH omozigote. Isis ha numerosi farmaci in fase three di sviluppo di malattia grave e rara e cardiovascolare. Tra questi, un nuovo farmaco riduzione dei trigliceridi, ISIS APOCIIIRx, per i pazienti con sindrome di chilomicronemia familiare; ISIS TTRRx, che Iside sta sviluppando con GSK per il trattamento di pazienti con la forma di polineuropatia TTR amiloidosi; e, ISIS SMNRx, che Iside sta sviluppando con Biogen Idec per il trattamento di neonati e bambini con l'atrofia muscolare spinale, una malattia neuromuscolare grave e rara. Brevetti Isis 'fornire una protezione forte ed estesa per i suoi farmaci e la tecnologia.
ISIS GSK5Rx è il secondo farmaco in collaborazione con GSK per entrare in sviluppo per il trattamento di una malattia oculare. Questo farmaco sfrutta le proprietà uniche di antisenso per ridurre selettivamente la produzione di un obiettivo noti per essere coinvolti in varie malattie oculari. Saremo lieti di avanzare questo programma e la condivisione di informazioni sul bersaglio e la malattia , ha detto B. Lynne Parshall, Chief Operating Officer di Iside. La nostra collaborazione con GSK è stata molto produttiva e ha portato a una serie di nuovi farmaci antisenso nella nostra pipeline per il trattamento di una vasta gamma di malattie.





saltare subreddits contentmy
2BNamedLater commenti su Mt Baker Vapor vuole sentire la tua
Ho fumato un pacchetto al giorno per 25 anni. Ho smesso di 265 giorni fa, con un MVP2 ho ricevuto dal Monte Baker, come un dato di fatto. Ho una nuora che è allergico al fumo di sigaretta e di un nuovo nipote bambino. Vengono a cena ogni Domenica. Mio marito ed io eravamo entrambi fumatori e affumicato in casa, fatta eccezione per quando i bambini stanno visitando. Così, ogni Domenica aria che la casa, lavare tutti i posacenere, Fabreeze divani e così by means of e così through. Poi, con un sospiro di sollievo, accendiamo una sigaretta non appena furono fuori dalla porta. E 'stato un dolore enorme nel culo. Ricordo di aver pensato Questo sarebbe molto più facile se ho appena didn fumo. Un collega Redditor mi ha segnalato in direzione di / r / ECR e MBV e ho visto che il trasporto inseguitore come mi aspettavo per la consegna di un nuovo polmone. Ho ancora lavorando per ottenere il mio marito a smettere, ma la domenica sono molto più semplice ora.
limitare la mia ricerca a / r / electronic_cigaretteuse i seguenti parametri di ricerca per restringere i risultati: vedere le faq di ricerca per i dettagli.






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