Check List of the Marine Invertebrates of Virginia
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Effects of Temperature on Seta Elongation in Atrichum Undulatum^ 2- 3
EFFECTS OF TEMPERATURE ON SETA ELONGATION IN ATRICHUM UNDULATUM^ 2- 3 DENNIS WM. STEVENSON4, JAMES R. RASTORFER, AND RAY E. SHOWMAN Department of Botany, The Ohio State University, Columbus, Ohio 43210 ABSTRACT Field-collected gametophytes of Atrichum undulatum were placed in two growth chambers which were maintained at the same light intensity and light period, but at two different temperature regimes. After sporophyte development, differences in seta lengths were observed. Measurements of cell lengths revealed that attached setae grown in the high-temperature regime (12°-22°C) were longer than those grown in a low-temperature regime (3°-12°C), as a result of both more cell divisions and a larger average cell length. Thus, temperature appeared to influence both cell division and cell elongation in the setae of Atrichum undulatum. INTRODUCTION Sporophytes of most liverworts and mosses (Bryophyta) consist of a basal foot attached to the gametophyte and a seta or stalk, which supports a spore-bearing capsule at its apex. Lengths of setae at sporophyte maturity differ among species, varying from a minute structure to a conspicuous organ which may exceed 5 cm (Watson, 1964). Setae of the Common Hair-Cap Moss (Polytrichum commune) are reported to vary from 6 to 12 cm in length (Welch, 1957), but unfortunately it is not clearly understood whether these differences are caused by genetic factors or environmental factors or both. A few studies have suggested that seta elonga- tion can apparently be influenced by environmental factors (e.g. temperature; light intensity; day length), and that there may be interactions of internal plant factors (e.g. -
Faunistic and Biological Notes on Marine Invertebrates Iii
Biologiske Meddelelser udgivet af Det Kongelige Danske Videnskabernes Selskab Bind 23, no. 1 Biol. Medd. Dan. Vid. Selsk. 23, no. 1 (1956) FAUNISTIC AND BIOLOGICAL NOTES ON MARINE INVERTEBRATES III. • The Reproduction and Larval Development of some Polychaetes from the Isefjord, with some Faunistic Notes. B Y • ERIK RASMUSSEN (Report from the Isefjord Laboratory No. 3) København 1956 i kommission hos Ejnar Munksgaard D et Kongelige Danske V idenskabernes Selskab udgiver følgende publikationsrækker : L'Académie Royale des Sciences et des Lettres de Danemark publie les séries suivantes: Bibliograûsk forkortelse Ahréi/iation bibliographique Oversigt over selskabets virksomhed (8°) Overs. Dan. Vid. Selsk. (Annuaire) Historisk-filologiske Meddelelser (8°) Hist. Filol. Medd. Dan. Vid. Selsk. -Historisk-filologiske Skrifter (4°) Hist. Filol. Skr. Dan. Vid. Selsk. (Histoire et Philologie) Arkæologisk-kunsthistoriske Meddelelser (8°) Arkæol. Kunsthist. Medd. Dan. Vid. Selsk. Arkæologisk-kunsthistoriske Skrifter (4°) Arkæol. Kunsthist. Skr. Dan. Vid. (Archéologie et Histoire de I’Art} Selsk. Filosofiske Meddelelser (8°) Filos. Medd. Dan. Vid. Selsk. (Philosophie) Matematisk-fysiske Meddelelser (8°) Mat. Fys. Medd. Dan. Vid. Selsk. (Mathémaliqnes et Physique) Biologiske Meddelelser (8°) Biol. Medd. Dan. Vid. Selsk. Biologiske Skrifter (4®) Biol. Skr. Dan. Vid. Selsk. (Biologie) Selskabets sekretariat og postadresse: Dantes plads 5, København V. L'adresse poslale du secrétariat de VAcadémie est: Det Kongelige Danske Videnskabernes Selskab, Dantes plads 5, København V, Danmark. Selskabets kommissionær: Ejnar Munksgaard’s forlag, Nørregade 6, København K. Les publications sont en vente chez le commissionnaire: Ejnar Münksgaard, éditeur. Nørregade 6, København K, Danmark. Biologiske Meddelelser udgivet af Det Kongelige Danske Videnskabernes Selskab Bind 23, no. 1 Biol. Medd. Dan. -
OREGON ESTUARINE INVERTEBRATES an Illustrated Guide to the Common and Important Invertebrate Animals
OREGON ESTUARINE INVERTEBRATES An Illustrated Guide to the Common and Important Invertebrate Animals By Paul Rudy, Jr. Lynn Hay Rudy Oregon Institute of Marine Biology University of Oregon Charleston, Oregon 97420 Contract No. 79-111 Project Officer Jay F. Watson U.S. Fish and Wildlife Service 500 N.E. Multnomah Street Portland, Oregon 97232 Performed for National Coastal Ecosystems Team Office of Biological Services Fish and Wildlife Service U.S. Department of Interior Washington, D.C. 20240 Table of Contents Introduction CNIDARIA Hydrozoa Aequorea aequorea ................................................................ 6 Obelia longissima .................................................................. 8 Polyorchis penicillatus 10 Tubularia crocea ................................................................. 12 Anthozoa Anthopleura artemisia ................................. 14 Anthopleura elegantissima .................................................. 16 Haliplanella luciae .................................................................. 18 Nematostella vectensis ......................................................... 20 Metridium senile .................................................................... 22 NEMERTEA Amphiporus imparispinosus ................................................ 24 Carinoma mutabilis ................................................................ 26 Cerebratulus californiensis .................................................. 28 Lineus ruber ......................................................................... -
ADHESIVE FORCE of a SINGLE GECKO SETA a Thesis Presented
ADHESIVE FORCE OF A SINGLE GECKO SETA A Thesis Presented to The Graduate Faculty of The University of Akron In Partial Fulfillment of the Requirements for the Degree Master of Science Lan Yu May, 2018 ADHESIVE FORCE OF A SINGLE GECKO SETA Lan Yu Thesis Approved: Accepted: Advisor Dean of College Dr. Ali Dhinojwala Dr. Eric J. Amis Committee Member Dean of the Graduate School Dr. Hunter King Dr. Chand K. Midha Department Chair Date Dr. Coleen Pugh ii ABSTRACT The gecko’s adhesion system uses arrays of setae to achieve strong and repeatable adhesion. Observation of the toe pad structure shows that shorter setae are generally proximal while longer ones distal [39]. We hypothesized that a seta of longer length would generate higher adhesive force, as long and slender setae have lower bending modulus, and therefore making it easier to contact spatulae with the surface. By following previous single seta experiments [11], we first measured the shear force generated by an isolated gecko seta using Nano Bionix. We also tested the length hypothesis by measuring the shear adhesion ability of single seta of varying lengths ranging from 80 to 140µm, which was taken from different parts of the gecko toe pad from distal to proximal. Measurements gave the result of shear forces of a single seta in the range of 80 to 250µN and an average of 136.81µN. This number is lower than the average value 194µN in previous studies, which is tested under a preload of 15µN [11]. In addition, results from 12 individual setae suggested that shear adhesion force of a single seta is independent of setal length and dependent on setal diameter. -
Plant Reproduction
AccessScience from McGraw-Hill Education Page 1 of 10 www.accessscience.com Plant reproduction Contributed by: Scott D. Russell Publication year: 2014 The formation of a new plant that is either an exact copy or recombination of the genetic makeup of its parents. There are three types of plant reproduction considered here: (1) vegetative reproduction, in which a vegetative organ forms a clone of the parent; (2) asexual reproduction, in which reproductive components undergo a nonsexual form of production of offspring without genetic rearrangement, also known as apomixis; and (3) sexual reproduction, in which meiosis (reduction division) leads to formation of male and female gametes that combine through syngamy (union of gametes) to produce offspring. See also: PLANT; PLANT PHYSIOLOGY. Vegetative reproduction Unlike animals, plants may be readily stimulated to produce identical copies of themselves through cloning. In animals, only a few cells, which are regarded as stem cells, are capable of generating cell lineages, organs, or new organisms. In contrast, plants generate or produce stem cells from many plant cells of the root, stem, or leaf that are not part of an obvious generative lineage—a characteristic that has been known as totipotency, or the general ability of a single cell to regenerate a whole new plant. This ability to establish new plants from one or more cells is the foundation of plant biotechnology. In biotechnology, a single cell may be used to regenerate new organisms that may or may not genetically differ from the original organism. If it is identical to the parent, it is a clone; however, if this plant has been altered through molecular biology, it is known as a genetically modified organism (GMO). -
Possible Late Pleistocene Uplift, Chesapeake Bay Entrance
W&M ScholarWorks VIMS Articles Virginia Institute of Marine Science 2-1965 Possible late Pleistocene uplift, Chesapeake Bay entrance W. Harrison RJ Malloy GA Rusnak J Terasmae Follow this and additional works at: https://scholarworks.wm.edu/vimsarticles Part of the Geology Commons VOLUME 73 NUMBER 2 THE JOURNAL OF GEOLOGY March 1965 POSSIBLE LATE PLEISTOCENE UPLIFT CHESAPEAKE BAY ENTRANCE1 W. HARRISON,2 R. J. MALLOY,3 GENE A. RUSNAK,4 AND J. TERASMAE5 ABSTRACT Paleontological and lithological studies of engineering borings and boring logs indicate that a buried, subaerial erosion surface of Pliocene (?)-Pleistocene age cuts across clastic sediments of pre-Yorktownian Miocene age in the subsurface and subbottom of the lower Chesapeake Bay area. When the bore-hole data are coupled with the results of subbottom echo profiling and piledriving records, it is possible to construct accurate cross sections of the buried Miocene-Pleistocene contact. The cross sections show "lows" in the erosion surface that may be correlated with the buried channels of the Pleistocene Elizabeth, James, York, and Susquehanna river valleys. Probable channel depths below mean low water at control points are: 100 feet (Elizabeth River, beneath Tunnel no. 1), 155 feet (James River, at Hampton Roads Tunnel), 120 feet (York River, at Yorktown), 158 feet (Susquehanna River, off Cape Charles City), and 160 feet (Susquehanna River, at Fisherman Island, Cape Charles). The channel depths of what is believed to be the buried Susquehanna River valley are less than expected when placed on a curve showing the expectable gradients of that stream during the time of the most-recent, maximum lowering of sea level (ca. -
VIRGINIA the Birthplace of a Nation
VIRGINIA The Birthplace of a Nation Created for free use in the public domain American Philatelic Society ©2010 • www.stamps.org Financial support for the development of these album pages provided by Mystic Stamp Company America’s Leading Stamp Dealer and proud of its support of the American Philatelic Society www.MysticStamp.com, 800-433-7811 Virginia Discovered The history of Virginia begins long before the Englishmen set foot in the New World. The land had been inhabited by Native Americans for several thousand years. The Algonquian, Iroquoian, Siouan all resided along the Central Atlantic coast. After the discovery of the New World, England, the Dutch Republic, France, Portugal, and Spain all attempted to establish New World colonies. A Spanish exploration party had come to the lower Chesapeake Bay region of Virginia about 1560 and met the Native Americans living on the Virginia Peninsula. The first English settlers arrived at Jamestown in 1607. Jamestown Exposition Issue Jamestown Exposition Issue Founding of Jamestown, 1607 Captain John Smith 1907 • Scott 329 1580–1631 1907 • Scott 328 Jamestown was founded in 1607 by a group of 104 English “gentlemen” who were sent by King James I to John Smith is remembered as the leader of the first English search for gold and a water route to the Orient. Disease, settlement in Virginia. Having endured the four month famine, and attacks from the Algonquians, took a toll on journey (from December 1606 to April 1607) to the New the initial population. However, with the determination World, the colonists only survived because of Smith’s “He of John Smith and the trading with Powhatan (chief of who does not work, will not eat” policy. -
GENERAL BOTANY Lecture 32 - Bryophytes
Jim Bidlack - BIO 1304 GENERAL BOTANY Lecture 32 - Bryophytes COMMENT: WELCOME TO THE WORLD OF PLANTS!! (WE'RE NOW IN KINGDOM PLANTAE) I. General characteristics of the Bryophyte Phyla A. Similarities to algae 1. Produce free-swimmin' sperm that travel through water to reach the eggs 2. No vascular system 3. No lignified tissue 4. Lack roots and true leaves B. What makes Bryophytes members of the Kingdom Plantae? 1. Eucaryotic 2. Lack chitinous walls (cellulose instead) & photosynthesis 3. Embryos have a jacket of sterile cells encasing reproductive cells C. Special characteristics of Bryophytes 1. Eggs formed in archegonia; sperm produced in antheridia 2. Chief photosynthetic body is the gametophyte (haploid) - note that Bryophytes demonstrate the sporic life cycle (sporophyte & gametophyte) 3. Structure is usually thallus 4. Uses: ecological importance, aesthetic value, absorbing ability, food, and medicine 5. May be the evolutionary link between algae and higher plants II. Characteristics of Bryophyte Phyla A. Phylum Hepaticophyta (liverworts - "HHHHEEEEPPPPPTTTTT!!!! [liver]") - small, green, ribbon-shaped plants 1. Two generations: gametophyte (predominant) and sporophyte 2. Ribbon-shaped thallus can often form a rosette 3. Female part (archegonia) has a head that looks like a palm tree (archegoniophore); male part (antheridia) has a head that looks like an umbrella (antheridiophore) 4. Collective term for archegonia and antheridia is gametangia B. Phylum Antherocerotophyta (hornworts - "antlers [horns]"): looks like liverwort except that the sporophyte has a much longer structure 1. Two generations: gametophyte is a ribbon-shaped thallus and sporophyte towers over the gametophyte 2. Hornworts are unique because they only have one large chloroplast per cell and those chloroplasts have pyrenoids (mosses and liverworts have many chloroplasts and lack pyrenoids) C. -
3.11 Socioeconomics
Atlantic Fleet Training and Testing Draft EIS/OEIS June 2017 Draft Environmental Impact Statement/Overseas Environmental Impact Statement Atlantic Fleet Training and Testing TABLE OF CONTENTS 3.11 Socioeconomics .................................................................................................... 3.11-1 3.11.1 Introduction and Methods ................................................................................ 3.11-1 3.11.2 Affected Environment ....................................................................................... 3.11-2 3.11.2.1 Sources of Energy Production and Distribution ............................... 3.11-2 3.11.2.2 Mineral Extraction ............................................................................ 3.11-7 3.11.2.3 Commercial Transportation and Shipping ...................................... 3.11-10 3.11.2.4 Commercial and Recreational Fishing ............................................ 3.11-22 3.11.2.5 Aquaculture .................................................................................... 3.11-32 3.11.2.6 Tourism ........................................................................................... 3.11-33 3.11.3 Environmental Consequences ........................................................................ 3.11-35 3.11.3.1 Impacts on Accessibility .................................................................. 3.11-36 3.11.3.2 Impacts from Airborne Acoustics ................................................... 3.11-46 3.11.3.3 Physical Disturbance and Strike Stressors -
Revising the Definition of the Crustacean Seta and Setal
Blackwell Science, LtdOxford, UKZOJZoological Journal of the Linnean Society0024-4082The Lin- nean Society of London, 2004? 2004 142? 233252 Original Article DEFINITION OF CRUSTACEAN SETAE AND SETAL CLASSIFICATION SYSTEMA. GARM Zoological Journal of the Linnean Society, 2004, 142, 233–252. With 11 figures Revising the definition of the crustacean seta and setal classification systems based on examinations of the mouthpart setae of seven species of decapods A. GARM* Biological Institute, University of Copenhagen, Denmark Received July 2003; accepted for publication June 2004 The crustacean cuticle has numerous projections and some of these projections, the setae, have important mechan- ical as well as sensory functions. The setae display a wide diversity in their external morphology, which has led to great problems separating setae from other projections in the cuticle and problems in making a consistent classifi- cation system. Here, the cuticular projections on the mouthparts of seven species of decapods are examined by scan- ning and transmission electron microscopy. A new definition is given: a seta is an elongate projection with a more or less circular base and a continuous lumen; the lumen has a semicircular arrangement of sheath cells basally. From the details of the external morphology the mouthpart setae are divided into seven types: pappose, plumose, serrulate, serrate, papposerrate, simple and cuspidate setae, which are suggested to reflect mechanical functions and not evolutionary history. This classification system is compared with earlier systems. © 2004 The Linnean Society of London, Zoological Journal of the Linnean Society, 2004, 142, 233–252. ADDITIONAL KEYWORDS: functional morphology – mechanical function – setal types. INTRODUCTION paper, the most often used term is setae and it will therefore be used here. -
Hermit Crabs - Paguridae and Diogenidae
Identification Guide to Marine Invertebrates of Texas by Brenda Bowling Texas Parks and Wildlife Department April 12, 2019 Version 4 Page 1 Marine Crabs of Texas Mole crab Yellow box crab Giant hermit Surf hermit Lepidopa benedicti Calappa sulcata Petrochirus diogenes Isocheles wurdemanni Family Albuneidae Family Calappidae Family Diogenidae Family Diogenidae Blue-spot hermit Thinstripe hermit Blue land crab Flecked box crab Paguristes hummi Clibanarius vittatus Cardisoma guanhumi Hepatus pudibundus Family Diogenidae Family Diogenidae Family Gecarcinidae Family Hepatidae Calico box crab Puerto Rican sand crab False arrow crab Pink purse crab Hepatus epheliticus Emerita portoricensis Metoporhaphis calcarata Persephona crinita Family Hepatidae Family Hippidae Family Inachidae Family Leucosiidae Mottled purse crab Stone crab Red-jointed fiddler crab Atlantic ghost crab Persephona mediterranea Menippe adina Uca minax Ocypode quadrata Family Leucosiidae Family Menippidae Family Ocypodidae Family Ocypodidae Mudflat fiddler crab Spined fiddler crab Longwrist hermit Flatclaw hermit Uca rapax Uca spinicarpa Pagurus longicarpus Pagurus pollicaris Family Ocypodidae Family Ocypodidae Family Paguridae Family Paguridae Dimpled hermit Brown banded hermit Flatback mud crab Estuarine mud crab Pagurus impressus Pagurus annulipes Eurypanopeus depressus Rithropanopeus harrisii Family Paguridae Family Paguridae Family Panopeidae Family Panopeidae Page 2 Smooth mud crab Gulf grassflat crab Oystershell mud crab Saltmarsh mud crab Hexapanopeus angustifrons Dyspanopeus -
The Eastern Shore of Virginia, 1603-1964
For Reference Do Hot Take From the Library The laaB Eastern Shore l^UmUlllliUI IHitllUU^tSR Virginia 1603 - 1964 »« m • For Reference Not to be taken from this room V^€' T), v/ VIRGINIA BEACH PUBLIC LIBRARY CENTRAL LIBIJAR'Y 4100 VIRGiHlA BEACH BLVD. VIIJGINIA BtACH, VA= 23452 NOTE The following explanations are offered relative to inlonnation contained in this printing of The Eastern Shore of Virginia 1603-1964. Page Line 1 3 Reference is made to modern reckoning of longitude. 28 20 The wife of William Gotten was a sis- ter-in-law of William Stone. 43 3 The date should be July 28, 1643. 43 10 The date should be March 1643 N. S. 110 25 The General Assembly of 1732 provided for local sponsorship for licensing at- torneys rather than providing for the direct licensing of attorneys. 197 16 It was George R. Mapp who became the third superintendent and not John R. Mapp. 272 40 William T. Fitchett was Circuit Court Judge from March 1882 to March 1884 between two terms of Benjamin T. Gun- ter. 274 38 The reference to the Clerk of Court should be Robert H. Oldham rather than Robert H. Oldham, Jr. 274 49 In the list of Superintendent of Schools for Northampton County, the name should be D. W. Peterson rather than W. D. Peters, 280 1 John Andrews Upshur was graduated from the United States Naval Academy in the class of 1921. 280 44 Henry Alexander Wise was the son of Edward S. Wise rather than Edgar S. Wise as stated.