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Martian Crater Morphology
ANALYSIS OF THE DEPTH-DIAMETER RELATIONSHIP OF MARTIAN CRATERS A Capstone Experience Thesis Presented by Jared Howenstine Completion Date: May 2006 Approved By: Professor M. Darby Dyar, Astronomy Professor Christopher Condit, Geology Professor Judith Young, Astronomy Abstract Title: Analysis of the Depth-Diameter Relationship of Martian Craters Author: Jared Howenstine, Astronomy Approved By: Judith Young, Astronomy Approved By: M. Darby Dyar, Astronomy Approved By: Christopher Condit, Geology CE Type: Departmental Honors Project Using a gridded version of maritan topography with the computer program Gridview, this project studied the depth-diameter relationship of martian impact craters. The work encompasses 361 profiles of impacts with diameters larger than 15 kilometers and is a continuation of work that was started at the Lunar and Planetary Institute in Houston, Texas under the guidance of Dr. Walter S. Keifer. Using the most ‘pristine,’ or deepest craters in the data a depth-diameter relationship was determined: d = 0.610D 0.327 , where d is the depth of the crater and D is the diameter of the crater, both in kilometers. This relationship can then be used to estimate the theoretical depth of any impact radius, and therefore can be used to estimate the pristine shape of the crater. With a depth-diameter ratio for a particular crater, the measured depth can then be compared to this theoretical value and an estimate of the amount of material within the crater, or fill, can then be calculated. The data includes 140 named impact craters, 3 basins, and 218 other impacts. The named data encompasses all named impact structures of greater than 100 kilometers in diameter. -
Towards Bioinspired in Vitro Models of Intestinal Mucus
RSC Advances REVIEW View Article Online View Journal | View Issue Towards bioinspired in vitro models of intestinal mucus Cite this: RSC Adv.,2019,9, 15887 Lorenzo Sardelli, Daniela Peneda Pacheco, Anna Ziccarelli, Marta Tunesi, Omar Caspani, Andrea Fusari, Francesco Briatico Vangosa, Carmen Giordano and Paola Petrini * Intestinal mucus is a biological structure that acts as a barrier between the external environment and the epithelium. It actively selects nutrient and drug intake, regulates the symbiosis with the intestinal microbiota and keeps the epithelium protected from the attack of pathogens. All these functions are closely connected to the chemical and structural complexity of this biological material, on which its viscoelastic and diffusive properties depend. Many models have been proposed to replicate these characteristics using glycoproteins in solution and possibly the addition of other mucus components, such as lipids and other proteins. In the field of mucus modelling, an overall view of the mucus as a material, having its own viscous, rheological and diffusive characteristics, has been undersized with Creative Commons Attribution-NonCommercial 3.0 Unported Licence. Received 28th March 2019 respect to a pure biological-functional analysis. In this review, we propose a description of the mucus as Accepted 9th May 2019 a biomaterial, including a presentation of its chemical and structural complexity, and of its main DOI: 10.1039/c9ra02368b viscoelastic-diffusive properties, in order to provide a synthesis of the characteristics necessary for the rsc.li/rsc-advances engineering of more advanced mucus models. Introduction The European Union has moved towards increasing Replacement, Reduction and Rening (3Rs principle) of animal The intestinal microbial species, present in both physiological studies with other scientically validated alternatives, such as in This article is licensed under a and pathological conditions, affect multiple districts of the vitro models,10 as tools for high throughput screening, limiting human body. -
(Approx) Mixed Micro Shells (22G Bags) Philippines € 10,00 £8,64 $11,69 Each 22G Bag Provides Hours of Fun; Some Interesting Foraminifera Also Included
Special Price £ US$ Family Genus, species Country Quality Size Remarks w/o Photo Date added Category characteristic (€) (approx) (approx) Mixed micro shells (22g bags) Philippines € 10,00 £8,64 $11,69 Each 22g bag provides hours of fun; some interesting Foraminifera also included. 17/06/21 Mixed micro shells Ischnochitonidae Callistochiton pulchrior Panama F+++ 89mm € 1,80 £1,55 $2,10 21/12/16 Polyplacophora Ischnochitonidae Chaetopleura lurida Panama F+++ 2022mm € 3,00 £2,59 $3,51 Hairy girdles, beautifully preserved. Web 24/12/16 Polyplacophora Ischnochitonidae Ischnochiton textilis South Africa F+++ 30mm+ € 4,00 £3,45 $4,68 30/04/21 Polyplacophora Ischnochitonidae Ischnochiton textilis South Africa F+++ 27.9mm € 2,80 £2,42 $3,27 30/04/21 Polyplacophora Ischnochitonidae Stenoplax limaciformis Panama F+++ 16mm+ € 6,50 £5,61 $7,60 Uncommon. 24/12/16 Polyplacophora Chitonidae Acanthopleura gemmata Philippines F+++ 25mm+ € 2,50 £2,16 $2,92 Hairy margins, beautifully preserved. 04/08/17 Polyplacophora Chitonidae Acanthopleura gemmata Australia F+++ 25mm+ € 2,60 £2,25 $3,04 02/06/18 Polyplacophora Chitonidae Acanthopleura granulata Panama F+++ 41mm+ € 4,00 £3,45 $4,68 West Indian 'fuzzy' chiton. Web 24/12/16 Polyplacophora Chitonidae Acanthopleura granulata Panama F+++ 32mm+ € 3,00 £2,59 $3,51 West Indian 'fuzzy' chiton. 24/12/16 Polyplacophora Chitonidae Chiton tuberculatus Panama F+++ 44mm+ € 5,00 £4,32 $5,85 Caribbean. 24/12/16 Polyplacophora Chitonidae Chiton tuberculatus Panama F++ 35mm € 2,50 £2,16 $2,92 Caribbean. 24/12/16 Polyplacophora Chitonidae Chiton tuberculatus Panama F+++ 29mm+ € 3,00 £2,59 $3,51 Caribbean. -
Appendix I Lunar and Martian Nomenclature
APPENDIX I LUNAR AND MARTIAN NOMENCLATURE LUNAR AND MARTIAN NOMENCLATURE A large number of names of craters and other features on the Moon and Mars, were accepted by the IAU General Assemblies X (Moscow, 1958), XI (Berkeley, 1961), XII (Hamburg, 1964), XIV (Brighton, 1970), and XV (Sydney, 1973). The names were suggested by the appropriate IAU Commissions (16 and 17). In particular the Lunar names accepted at the XIVth and XVth General Assemblies were recommended by the 'Working Group on Lunar Nomenclature' under the Chairmanship of Dr D. H. Menzel. The Martian names were suggested by the 'Working Group on Martian Nomenclature' under the Chairmanship of Dr G. de Vaucouleurs. At the XVth General Assembly a new 'Working Group on Planetary System Nomenclature' was formed (Chairman: Dr P. M. Millman) comprising various Task Groups, one for each particular subject. For further references see: [AU Trans. X, 259-263, 1960; XIB, 236-238, 1962; Xlffi, 203-204, 1966; xnffi, 99-105, 1968; XIVB, 63, 129, 139, 1971; Space Sci. Rev. 12, 136-186, 1971. Because at the recent General Assemblies some small changes, or corrections, were made, the complete list of Lunar and Martian Topographic Features is published here. Table 1 Lunar Craters Abbe 58S,174E Balboa 19N,83W Abbot 6N,55E Baldet 54S, 151W Abel 34S,85E Balmer 20S,70E Abul Wafa 2N,ll7E Banachiewicz 5N,80E Adams 32S,69E Banting 26N,16E Aitken 17S,173E Barbier 248, 158E AI-Biruni 18N,93E Barnard 30S,86E Alden 24S, lllE Barringer 29S,151W Aldrin I.4N,22.1E Bartels 24N,90W Alekhin 68S,131W Becquerei -
In Pdf Format
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Marine Ecology Progress Series 228:153
MARINE ECOLOGY PROGRESS SERIES Vol. 228: 153–163, 2002 Published March 6 Mar Ecol Prog Ser Carnivore/non-carnivore ratios in northeastern Pacific marine gastropods James W. Valentine1,*, Kaustuv Roy2, David Jablonski3 1Department of Integrative Biology and Museum of Paleontology, University of California, Berkeley, California 94720, USA 2Ecology, Behavior and Evolution Section, Division of Biology, University of California at San Diego, 9500 Gilman Drive, La Jolla, California 92093-0116, USA 3Department of Geophysical Sciences, University of Chicago, 5734 Ellis Avenue, Chicago, Illinois 60637, USA ABSTRACT: For 2321 species of shelled gastropods of the northeastern Pacific, the ratio of carnivo- rous to non-carnivorous species (C/NC ratio), computed for each degree of latitude, reveals striking spatial changes, with tropical and arctic areas characterized by high values and with the mid- latitudes having the lowest ratios. This latitudinal trend is markedly different from trends for terres- trial clades. The zonal variation in C/NC ratios within bins is largely due to differences in geographic ranges of the groups; for example, tropical carnivorous species range farther than non-carnivorous ones, thus overlapping them in more latitudinal bins. Differences in the distribution and diversity of carnivorous and non-carnivorous species may arise from a number of sources, including variability of primary production in the tropical eastern Pacific, patchiness of substrates to which non-carnivores are adapted, narrow dietary specializations of tropical carnivores, and higher provinciality found in extratropical regions. KEY WORDS: Trophic ratios · Latitudinal diversity trends · Provinciality · Variable productivity Resale or republication not permitted without written consent of the publisher INTRODUCTION diversities (Faaborg 1985, Jeffries & Lawton 1985, Karr et al. -
Und Belegsammlungen Sammlung Geologie Mikropaläontologie, Wirbellosen-Paläontologie Walter Etter
Liste der Typen- und Belegsammlungen Sammlung Geologie Mikropaläontologie, Wirbellosen-Paläontologie Walter Etter zuletzt aktualisiert am: 14.12.2016 Typen- und Belegsammlungen 1 Umfang Fossil- Bemerkungen zur Sammlung Prim.- Anzahl Autor(en) od. Sammler Jahr Zitat (Titel) Journal/Verlag print pdf Region Stratigraphie Standort (Anzahl gruppe Dokumentation? Typen Stücke Schieber) Description des echinodermes Nouv. Mém. Soc. Helv. Agassiz, Louis 1840 fossiles de la Suisse. 2e partie: x x Ech Jura Jura 2 Holotypen, 2 Syntypen, 2 Belege 2 6 A08/129 0.1 Sci. Nat. 4, 1-107 Cidarides Etudes critiques sur les Agassiz, Louis 1840 Mollusques fossiles; Mémoire des Neuchatel, 1-58 x x Moll Jura, Frankreich Jura-Kreide 2 Holotypen, 10 Cotypen und Belege 2 12 A01/171 0.3 Trigonies Monographie d'echinodermes vivans et fossiles. Echinites. Frankreich, 2 Syntypen, davon 1 Verweis auf Knorr & Agassiz, Louis 1841 Neuchatel, 1-152 x x Ech Tertiär 1 1 A08/129 0.1 Famille des Clypéastroides. 2e Italien Walch 1768 Monographie. Des Scutelles Etudes critiques sur les Jura, Frankreich, ca 20 Belege, alles Abgüsse, z. T. von Agassiz, Louis 1842 Mollusques fossiles; Monographie Neuchatel, 1-142 x x Moll Jura-Kreide 0 20 A01/171 0.7 England Typen des Myes Costa Rica, Aguilera, O. A., Schwarzhans, W. & Otoliths of the Sciaenidae from Palaeo Ichthyologica Dominikanische 2016 x x Vert Tertiär Béarez, P. the Neogene of tropical America 14, 7-90 Republik, Panama Geologie des Fürstentums Selbstverlag des Liechtenstein. 3. Teil. Geologie Historischen Vereins für des südlichen Gebietes Falknis, Jura, Kreide, Allemann, F. 1956 das Fürstentum For Liechtenstein ca 70 Dünnschliffe 0 70 B02/199 1.0 Lawena, Triesenberg unter Tertiär Liechtenstein, Vaduz, besonderer Berücksichtigung des 244 S., 4 Taf. -
Regional Wind Patterns on Mars Inferred from Dune Field Studies
47th Lunar and Planetary Science Conference (2016) 1868.pdf REGIONAL WIND PATTERNS ON MARS INFERRED FROM DUNE FIELD STUDIES. Y-J. Ku1 and J. R. Zimbelman2, 1 Department of Geosciences, National Taiwan University, Taipei City 106, Taiwan (R.O.C), 2Center for Earth and Planetary Studies, MRC 315, National Air and Space Museum, Smithsonian Institution, Independence Avenue and 6th Street SW, Washington, DC 20013-7012. ([email protected]) Introduction: Sand dunes are good indicators for through mapping of the CTX images. Some of the the aeolian processes on Earth and Mars. Wind activi- dune types documented include: ties shaped many surface features on Mars, the shapes Barchan: The well-defined crescent-shape dunes of which are related to atmospheric circulation, as well indicate limited sand supply as well as the dominant as possibly to paleo-climate behavior. This research wind direction. Depending on dune shape, elongated classified 15 different types of sand dunes using CTX barchans and barchans with ‘tails’ were also defined, image mapping at 30 sites widely distributed around the later providing evidence for a bi-modal wind re- the planet [1], generating statistical information of dif- gime, perhaps reflecting seasonally varying winds with ferent types to provide a recent view of global wind respective angles as defined by [8]. The total mapped patterns on Mars. The results fill a gap between local area for barchan dunes from all sites is 1489.0 km2. ripple mapping and global wind models. Barchanoid: Generally arc-shaped dunes which are Background: Mars preserves a large number of connected but do not form a single continuous crest sand dune fields that reflect both past and present wind line. -
The Interference of Tetrachloromethane
The interference of tetrachloromethane in the measurement of benzene in air by Gas Chromatography - Photoionisation Detector (GC-PID) Cristina Romero-Trigueros1, Esther González 2, Marta Doval Miñarro3, Enrique González Ferradás2 5 1Dipartimento di Scienze Agro-Ambientali e Territoriali, University of Bari Aldo Moro, Via Amendola, 165/A, 70126, Bari, Italy 2Chemical Engineering Department, School of Chemistry, University of Murcia, 30071, Murcia, Spain 3Chemical and Environmental Engineering Department, Technical University of Cartagena, Paseo Alfonso XIII, 52, 30203 Cartagena, Murcia, Spain 10 Correspondence to: Esther González ([email protected]) Abstract. The European Union requires that benzene in air is continuously measured due to its toxicity and widespread presence in the population nuclei, mainly motivated by vehicle emissions. The reference measuring technique is gas chromatography (GC). Automatic chromatographs used in monitoring stations must verify the operating conditions 15 established in Standard EN 14662 part 3, which includes a type approval section with a number of tests that analysers must pass. Among these tests, the potential interference of a number of compounds is evaluated. The 2005 version of the mentioned standard requires the evaluation of the potential interference of tetrachloromethane (TCM). The 2015 version eliminates TCM as a potential interferent. Although most consumer uses of TCM have been banned, recent studies have measured significant concentrations of TCM in air. In this paper, the potential interference -
Columbellidae
WMSDB - Worldwide Mollusc Species Data Base Family: COLUMBELLIDAE Author: Claudio Galli - [email protected] (updated 07/set/2015) Class: GASTROPODA --- Clade: CAENOGASTROPODA-HYPSOGASTROPODA-NEOGASTROPODA-BUCCINOIDEA ------ Family: COLUMBELLIDAE Swainson, 1840 (Sea) - Alphabetic order - when first name is in bold the species has images Taxa=2015, Genus=71, Subgenus=24, Species=746, Subspecies=37, Synonyms=1136, Images=525 abyssicola , Pyreneola abyssicola (J.W. Brazier, 1877) achatina , Mitrella achatina G.B. Sowerby, 1844 - syn of: Mitrella gervillii (B.C.M. Payraudeau, 1826) acicula, Aoteatilia acicula (H.H. Suter, 1908) acicula , Columbella acicula L.A. Reeve, 1858 - syn of: Graphicomassa ligula (P.L. Duclos, 1840) aciculata , Mazatlania aciculata J.B.P.A. Lamarck, 1822 - syn of: Mazatlania cosentini (R.A. Philippi, 1836) acleonta , Metanachis acleonta P.L. Duclos, 1835 - syn of: Metanachis jaspidea (G.B. II Sowerby, 1844) acuminata , Amphissa acuminata (E.A. Smith, 1915) acuminata , Mitrella acuminata K.T. Menke, 1843 acus , Aesopus acus L.A. Reeve, 1859 - syn of: Aesopus obesus (R.B. Hinds, 1844) acuta , Mitrella acuta W. Kobelt, 1889 - syn of: Mitrella gervillii (B.C.M. Payraudeau, 1826) acutecostata , Amphissa acutecostata (R.A. Philippi, 1844) acuticostata , Amphissa acuticostata R.A. Philippi, 1844 - syn of: Amphissa acutecostata (R.A. Philippi, 1844) acutocostata , Amphissa acutocostata R.A. Philippi, 1844 - syn of: Amphissa acutecostata (R.A. Philippi, 1844) adamsi, Nassarina adamsi (G.W. Tryon, 1883) adamsi, Parvanachis adamsi M. De Maintenon, 2014 adansoni , Columbella adansoni K.T. Menke, 1853 adela, Antimitrella adela (K.H.J. Thiele, 1925) adelinae , Anachis adelinae (G.W. Tryon, 1883) adiostina , Mitrella adiostina P.L. Duclos, 1835 - syn of: Graphicomassa albina (L.C. -
Evolution, Distribution, and Phylogenetic Clumping of a Repeated Gastropod Innovation
Zoological Journal of the Linnean Society, 2017, 180, 732–754. With 5 figures. The varix: evolution, distribution, and phylogenetic clumping of a repeated gastropod innovation NICOLE B. WEBSTER1* and GEERAT J. VERMEIJ2 1Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada T6G 2E9 2Department of Earth and Planetary Sciences, University of California, Davis, CA 95616, USA Received 27 June 2016; revised 4 October 2016; accepted for publication 25 October 2016 A recurrent theme in evolution is the repeated, independent origin of broadly adaptive, architecturally and function- ally similar traits and structures. One such is the varix, a shell-sculpture innovation in gastropods. This periodic shell thickening functions mainly to defend the animal against shell crushing and peeling predators. Varices can be highly elaborate, forming broad wings or spines, and are often aligned in synchronous patterns. Here we define the different types of varices, explore their function and morphological variation, document the recent and fossil distri- bution of varicate taxa, and discuss emergent patterns of evolution. We conservatively found 41 separate origins of varices, which were concentrated in the more derived gastropod clades and generally arose since the mid-Mesozoic. Varices are more prevalent among marine, warm, and shallow waters, where predation is intense, on high-spired shells and in clades with collabral ribs. Diversification rates were correlated in a few cases with the presence of varices, especially in the Muricidae and Tonnoidea, but more than half of the origins are represented by three or fewer genera. Varices arose many times in many forms, but generally in a phylogenetically clumped manner (more frequently in particular higher taxa), a pattern common to many adaptations. -
N66 -19648 To7/-2 70 ?
I- ! 1 70 ? N66 -19648 ~ACCESSION~hlR) ITHRUI / #I (PAGES1 \ (&!I To7/-2 c (NASA CR OR TMX OR AD NUMBER) (CATEGORY) -/ GPO PRICE $ - CFSTI PRICE(§) $ Microfiche (MF) 75 ff 853 July 65 PHOTOMETRY AND POLARIMETRY OF THE MOON AND THEIR RELATIONSHIP TO PHYSICAL PROPERTIES OF THE LUNAR SURFACE August 23, 1963 BY C. A. Pearse 3ellco,m, Inc. ‘dashington, D. C. TABLE OF CONTENTS I SUMMARY I I. INTRODUCTION I 11. HISTORICAL BACKGROUND 111, LTJNAR PHOTOMETRIC MEASUREMENTS I IV . EXPERIMENTAL PHOTOMETRIC RESULTS V. OLDER THEORETICAL PHOTOMETRIC FUNCTIONS I VI. SUMMARY OF LUNAR PHOTOMETRIC RESULTS I VII. EXPERIMENTAL PHOTOMETRIC STUDIES OF TERRESTRIAL MATERIALS VIII. A RECENT THEORETICAL PHOTOMETRIC FUNCTION I IX. LUNAR COLORIMETRIC MEASUREMENTS X. LUNAR POLARIMETRIC STUDIES I XI. EXPERIMENTAL POLARIMETRIC MEASUREMENTS I XII. INTERPRETATION OF THE POLARIZATION OF LIGHT FROM THE MOON XI11 RECENT POLARIMETRIC STUDIES I XIV . THEORETICAL POLARIMETRIC CONSIDERATIONS xv. PROBABLE SMALL SCALE LUNAR SURFACE CONDITIONS I XVI . APPENDIX A - PHOTOMETRIC MODELS OF OPTICALLY ROUGH SURFACES 1, Suilface Scattering Fui-ictifiii 2. Lambert Emission Law I 3. Lambert Reflection Law 4. Schoenberg-Lommel-Seeliger Law 5. Sixrface Brightness - Photometric Function 6. The Principle of Reciprocity XVII, APPENDIX B - COLOR INDEXES AND EFFECTIVE TEMPERATURES SEFERENCES SUMMAliY This report is a review of the large body of experimental and theoretical information relating to the photometry of the moon, written, primarily, for those who have a direct interest in the subject matter. In the report an attempt is made to display the salient lunar light reflecting properties which are controlled by the exact nature of the lunar surface microrelief.