10,769 research outputs found
Letter from John H. Page to the Forester
No full textLetter from John H. Page regarding his right to build a railway between Grand Canyon Station and the Canyon Copper Company's mines and hotel
Letter from Carl Hayden to John H. Page
No full textLetter from Carl Hayden to John H. Page asking his opinion on the proposed national park bill. W.R. Hearst's name and property rights are mentioned
Letter from John H. Page to Carl Hayden
No full textLetter from John H. Page to Carl T. Hayden regarding his company's rights to build a railway if they choose to
Letter from A. F. Potter to John H. Page
No full textLetter from A. F. Potter to John H. Page referring his request to build a railway to the District Forester at Albuquerque, New Mexico
Expression Pattern of nos1 in the Developing Nervous System of Ray-Finned Fish
No full textFish have colonized nearly all aquatic niches, making them an invaluable resource to understand vertebrate adaptation and gene family evolution, including the evolution of complex neural networks and modulatory neurotransmitter pathways. Among ancient regulatory molecules, the gaseous messenger nitric oxide (NO) is involved in a wide range of biological processes. Because of its short half-life, the modulatory capability of NO is strictly related to the local activity of nitric oxide synthases (Nos), enzymes that synthesize NO from L-arginine, making the localization of Nos mRNAs a reliable indirect proxy for the location of NO action domains, targets, and effectors. Within the diversified actinopterygian nos paralogs, nos1 (alias nnos) is ubiquitously present as a single copy gene across the gnathostome lineage, making it an ideal candidate for comparative studies. To investigate variations in the NO system across ray-finned fish phylogeny, we compared nos1 expression patterns during the development of two well-established experimental teleosts (zebrafish and medaka) with an early branching holostean (spotted gar), an important evolutionary bridge between teleosts and tetrapods. Data reported here highlight both conserved expression domains and species-specific nos1 territories, confirming the ancestry of this signaling system and expanding the number of biological processes implicated in NO activities
What Controls Sex Development in Fish?
No full text12 pages. Translations available in English, Spanish, Chinese, French, Portuguese, Japanese, German, Italian, Danish, and Norwegian.In mammals and in birds, the sex of an individual is determined by its genes. A sex determining gene on a sex chromosome influence the development of ovaries or testes. But sex in fishes is much more diverse! What controls sex development in fish? Sex genes like in mammals and birds? Or do other types of sex determination systems exist in fish?
In this short scientific graphic novel, Sophia Breslin, John Postlethwait, and Thomas Desvignes introduce you to the control of sex determination in fish: from the genetic regulation by sex determining genes and sex chromosomes to various cases of hermaphrodism and the influence of the environment, revealing the myriad of different sex determination systems found in fishes
Letter from John H. Page to Carl Hayden
No full textLetter from John Page to Carl Hayden concerning the future of property ownership within the proposed boundaries of the national park
Correspondence from John Hulett to John Lewis, October 11, 1971
No full textCorrespondence from Sheriff John Hulett to John Lewis about supporting the promotional campaign of the Voter Education Project after the 1969 Tax Reform Act
A Mysterious Disease in Antarctic Fish
No full textWhile conducting research in Antarctica in 2018, scientists were surprised to capture many specimens of two species of fish that had massive skin tumors.
In this short graphic novel, “A mysterious disease in Antarctic fish“, Chloe DaMommio, John Postlethwait, and Thomas Desvignes take us on a scientific expedition to Antarctica aboard the US Antarctic Research Vessel Laurence M. Gould to capture those diseased fish, set sail to the isolated Palmer Station to sample them, then back to their laboratory in the States to identify the origin of this mysterious disease and its effects on the fish.
The graphic novel is available in English, Spanish, French, German, and Danish!
And to know more about the science behind the graphic novel, the research results are now published in open-access.This material is based upon work supported by the Office of Polar Programs at the National Science Foundation under NSF grant number OPP-1947040. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation
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