Nocturnal Light: Exploring the Perceptual Experience of Bioluminescence
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7.014 Handout PRODUCTIVITY: the “METABOLISM” of ECOSYSTEMS
7.014 Handout PRODUCTIVITY: THE “METABOLISM” OF ECOSYSTEMS Ecologists use the term “productivity” to refer to the process through which an assemblage of organisms (e.g. a trophic level or ecosystem assimilates carbon. Primary producers (autotrophs) do this through photosynthesis; Secondary producers (heterotrophs) do it through the assimilation of the organic carbon in their food. Remember that all organic carbon in the food web is ultimately derived from primary production. DEFINITIONS Primary Productivity: Rate of conversion of CO2 to organic carbon (photosynthesis) per unit surface area of the earth, expressed either in terns of weight of carbon, or the equivalent calories e.g., g C m-2 year-1 Kcal m-2 year-1 Primary Production: Same as primary productivity, but usually expressed for a whole ecosystem e.g., tons year-1 for a lake, cornfield, forest, etc. NET vs. GROSS: For plants: Some of the organic carbon generated in plants through photosynthesis (using solar energy) is oxidized back to CO2 (releasing energy) through the respiration of the plants – RA. Gross Primary Production: (GPP) = Total amount of CO2 reduced to organic carbon by the plants per unit time Autotrophic Respiration: (RA) = Total amount of organic carbon that is respired (oxidized to CO2) by plants per unit time Net Primary Production (NPP) = GPP – RA The amount of organic carbon produced by plants that is not consumed by their own respiration. It is the increase in the plant biomass in the absence of herbivores. For an entire ecosystem: Some of the NPP of the plants is consumed (and respired) by herbivores and decomposers and oxidized back to CO2 (RH). -
Relationships Between Net Primary Production, Water Transparency, Chlorophyll A, and Total Phosphorus in Oak Lake, Brookings County, South Dakota
Proceedings of the South Dakota Academy of Science, Vol. 92 (2013) 67 RELATIONSHIPS BETWEEN NET PRIMARY PRODUCTION, WATER TRANSPARENCY, CHLOROPHYLL A, AND TOTAL PHOSPHORUS IN OAK LAKE, BROOKINGS COUNTY, SOUTH DAKOTA Lyntausha C. Kuehl and Nels H. Troelstrup, Jr.* Department of Natural Resource Management South Dakota State University Brookings, SD 57007 *Corresponding author email: [email protected] ABSTRACT Lake trophic state is of primary concern for water resource managers and is used as a measure of water quality and classification for beneficial uses. Secchi transparency, total phosphorus and chlorophyll a are surrogate measurements used in the calculation of trophic state indices (TSI) which classify waters as oligotrophic, mesotrophic, eutrophic or hypereutrophic. Yet the relationships between these surrogate measurements and direct measures of lake productivity vary regionally and may be influenced by external factors such as non-algal tur- bidity. Prairie pothole basins, common throughout eastern South Dakota and southwestern Minnesota, are shallow glacial lakes subject to frequent winds and sediment resuspension. Light-dark oxygen bottle methodology was employed to evaluate vertical planktonic production within an eastern South Dakota pothole basin. Secchi transparency, total phosphorus and planktonic chlorophyll a were also measured from each of three basin sites at biweekly intervals throughout the 2012 growing season. Secchi transparencies ranged between 0.13 and 0.25 meters, corresponding to an average TSISD value of 84.4 (hypereutrophy). Total phosphorus concentrations ranged between 178 and 858 ug/L, corresponding to an average TSITP of 86.7 (hypereutrophy). Chlorophyll a values corresponded to an average TSIChla value of 69.4 (transitional between eutrophy and hypereutro- phy) and vertical production profiles yielded areal net primary productivity val- ues averaging 288.3 mg C∙m-2∙d-1 (mesotrophy). -
Electronic Text Book Unit 5
5 Light and Optics Chapter 14 Introduction to Chapter 14 Light We live in a world where light and color play a pivotal role in the very survival of life on this planet. Plants use sunlight to make sugar. Our ability to see helps us gather food. These processes and many others hinge on the unique properties of and light. This chapter will introduce you to some of light’s unique characteristics. Investigations for Chapter 14 Color 14.1 Introduction to Light How can you make light and how can you study it? In this Investigation you will look through a diffraction grating at a light source to see all the different colors that make up light. This leads us to the question “What makes different colors?” The different colors of light will be explained in terms of the energy of electrons falling from higher energy to lower energy inside atoms. Different atoms have different energy levels and produce different colors. 14.2 Color What happens when you mix different colors of light? All of the colors of light that you see are really a combination of three primary colors: red, blue and green. In this Investigation, you will discover how to make all colors of light by mixing the three primary colors. You will also use a tool called a spectrometer to analyze light. This instrument allows you to break light into its “fingerprint” wavelengths. 237 Chapter 14: Light and Color Learning Goals By the end of this chapter, you will be able to: ! Describe the atomic origin of light. -
Artificial Light in the Environment
Published by TSO (The Stationery Office) and available from: Online www.tsoshop.co.uk Mail, Telephone Fax & E-Mail TSO PO Box 29, Norwich, NR3 1GN Telephone orders/General enquiries 0870 600 5522 Order through the Parliamentary Hotline Lo-Call 0845 7 023474 Fax orders: 0870 600 5533 E-mail: [email protected] Textphone: 0870 240 3701 The Parliamentary Bookshop 12 Bridge Street, Parliament Square, London SW1A 2JX Telephone orders/ General enquiries: 020 7219 3890 Fax orders: 020 7219 3866 Email: [email protected] Internet: http://www.bookshop.parliament.uk TSO@Blackwell and other Accredited Agents Customers can also order publications from TSO Ireland 16 Arthur Street, Belfast BT1 4GD 028 9023 8451 Fax 028 9023 5401 ISBN 978-0-10-850854-7 9 780108 508547 Artificial Light in the Environment £14.35 © Crown Copyright 2009 The text in this document (excluding the Royal Arms and other departmental or agency logos) may be reproduced free of charge in any format or medium providing it is reproduced accurately and not used in a misleading context. The material must be acknowledged as Crown copyright and the title of the document specified. Where we have identified any third party copyright material you will need to obtain permission from the copyright holders concerned. For any other use of this material please contact the Office of Public Sector Information, Information Policy Team, Kew, Richmond, Surrey TW9 4DU or e-mail: [email protected]. ISBN: 9780108508547 Printed in the UK by The Stationery Office Limited on behalf of the Controller of Her Majesty’s Stationery Office ID 2328242 11/09 Printed on paper containing 75% recycled fibre content minimum. -
Photopigments and Color Vision in the Nocturnal Monkey, Aotus GERALD H
Vision Res. Vol. 33, No. 13, pp. 1773-1783, 1993 0042-6989/93 $6.00 + 0.00 Printed in Great Britain. All rights reserved Copyright 0 1993 Pergamon Press Ltd Photopigments and Color Vision in the Nocturnal Monkey, Aotus GERALD H. JACOBS,*? JESS F. DEEGAN II,* JAY NEITZ,$ MICHAEL A. CROGNALE,§ MAUREEN NEITZT Received 6 November 1992; in revised form 3 February 1993 The owl monkey (Aotus tridrgutus) is the only nocturnal monkey. The photopigments of Aotus and the relationship between these photopigments and visual discrimination were examined through (1) an analysis of the tlicker photometric electroretinogram (ERG), (2) psychophysical tests of visual sensitivity and color vision, and (3) a search for the presence of the photopigment gene necessary for the production of a short-wavelength sensitive (SWS) photopigment. Roth electrophysiological and behavioral measurements indicate that in addition to a rod photopigment the retina of this primate contains only one other photopigment type-a cone pigment having a spectral peak cu 543 nm. Earlier results that suggested these monkeys can make crude color discriminations are interpreted as probably resulting from the joint exploitation of signals from rods and cones. Although Aotus has no functional SWS photopigment, hybridization analysis shows that A&us has a pigment gene that is highly homologous to the human SWS photopigment gene. Aotus trivirgatus Cone photopigments Monkey color vision Monochromacy Photopigment genes Evolution of color vision INTRODUCTION interest to anyone interested in visual adaptations for two somewhat contradictory reasons. On the one hand, The owl monkey (A&us) is unique among present study of A&us might provide the possibility of docu- day monkeys in several regards. -
Understanding Bioluminescence in Dinoflagellates—How Far Have We Come?
Microorganisms 2013, 1, 3-25; doi:10.3390/microorganisms1010003 OPEN ACCESS microorganisms ISSN 2076-2607 www.mdpi.com/journal/microorganisms Review Understanding Bioluminescence in Dinoflagellates—How Far Have We Come? Martha Valiadi 1,* and Debora Iglesias-Rodriguez 2 1 Department of Evolutionary Ecology, Max Planck Institute for Evolutionary Biology, August-Thienemann-Strasse, Plӧn 24306, Germany 2 Department of Ecology, Evolution and Marine Biology, University of California Santa Barbara, Santa Barbara, CA 93106, USA; E-Mail: [email protected] * Author to whom correspondence should be addressed; E-Mail: [email protected] or [email protected]; Tel.: +49-4522-763277; Fax: +49-4522-763310. Received: 3 May 2013; in revised form: 20 August 2013 / Accepted: 24 August 2013 / Published: 5 September 2013 Abstract: Some dinoflagellates possess the remarkable genetic, biochemical, and cellular machinery to produce bioluminescence. Bioluminescent species appear to be ubiquitous in surface waters globally and include numerous cosmopolitan and harmful taxa. Nevertheless, bioluminescence remains an enigmatic topic in biology, particularly with regard to the organisms’ lifestyle. In this paper, we review the literature on the cellular mechanisms, molecular evolution, diversity, and ecology of bioluminescence in dinoflagellates, highlighting significant discoveries of the last quarter of a century. We identify significant gaps in our knowledge and conflicting information and propose some important research questions -
Resource Competition Shapes Biological Rhythms and Promotes Temporal Niche
bioRxiv preprint doi: https://doi.org/10.1101/2020.04.22.055160; this version posted April 22, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. 1 2 3 Resource competition shapes biological rhythms and promotes temporal niche 4 differentiation in a community simulation 5 6 Resource competition, biological rhythms, and temporal niches 7 8 Vance Difan Gao1,2*, Sara Morley-Fletcher1,4, Stefania Maccari1,3,4, Martha Hotz Vitaterna2, Fred W. Turek2 9 10 1UMR 8576 Unité de Glycobiologie Structurale et Fonctionnelle, Campus Cité Scientifique, CNRS, University of 11 Lille, Lille, France 12 2 Center for Sleep and Circadian Biology, Northwestern University, Evanston, IL, United States of America 13 3Department of Medico-Surgical Sciences and Biotechnologies, University Sapienza of Rome, Rome, Italy 14 4International Associated Laboratory (LIA) “Perinatal Stress and Neurodegenerative Diseases”: University of Lille, 15 Lille, France; CNRS-UMR 8576, Lille, France; Sapienza University of Rome, Rome, Italy; IRCCS Neuromed, Pozzilli, 16 Italy 17 18 19 * Corresponding author 20 E-mail: [email protected] 21 1 bioRxiv preprint doi: https://doi.org/10.1101/2020.04.22.055160; this version posted April 22, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. -
Measuring Peroxyoxalate Chemiluminescence Using a Spectrofluorophotometer No.A493
LAAN-A-RF-E003 Application Spectrophotometric Analysis News Measuring Peroxyoxalate Chemiluminescence Using a Spectrofluorophotometer No.A493 Chemiluminescence is a phenomenon where molecules n Fluorescent Dyes Used in Glow Sticks are excited by a chemical reaction and then emit light Commercially marketed glow sticks are shown in Fig. 2. energy as they return to ground state. Chemiluminescence The oxalate ester and fluorescent dye solution are placed based on using oxalate esters features high-emission in a sealed thin-walled glass container and the glass efficiency and long emission time and provides container is placed inside a polyethylene tube together illumination for long periods without any electricity. with hydrogen peroxide solution to which a catalyst is Consequently, it is used for recreational, fishing, and many added. Bending the polyethylene tube breaks the glass other applications where it is commonly called glow sticks. container, which causes both solutions to mix together The following describes the luminescent process of and emit light. peroxyoxalate chemiluminescence and gives an example Examples of the fluorescent dyes used in glow sticks are of using an RF-6000 spectrofluorophotometer to measure shown in Fig. 3. Polycyclic aromatic fluorescent dyes are the emission spectra of glow sticks. used, which emit different colors based on the wavelength of light emitted when the fluorescent dyes change from excited to ground state. n Luminescent Process of Peroxyoxalate Chemiluminescence Peroxyoxalate chemiluminescence is caused by a chemical O RO O reaction between an oxalate ester and hydrogen peroxide O C within a fluorescent dye solution. As shown in Fig. 1, the C C + H2O2 2ROH + O C oxalate ester is oxidized by hydrogen peroxide to produce O OR O ROH and 1,2-dioxetanedione. -
A Comparative Study on the Affinities for Inorganic Carbon Uptake, Nitrate and Phosphate Between Marine Diatoms and Dinoflagellates
A comparative study on the affinities for inorganic carbon uptake, nitrate and phosphate between marine diatoms and dinoflagellates Mr. T. (Thomas) Hofman - 11066938 Institute for Biodiversity and Ecosystem Dynamics (IBED) Supervised by: mw. dr. J.H.M. Verspagen Abstract: Eutrophication and increasing atmospheric carbon dioxide concentrations are water quality concerns threatening our drinking water and food supply due to a rise in harmful cyanobacterial and harmful algal blooms. Understanding which factors determine the species distribution of phytoplankton could help to prevent the increase of these blooms in the future. Growth is thought to be limited by the scarcest resource available. As eutrophic waters are, by definition, rich in macronutrients such as nitrate and phosphate, inorganic carbon limitation becomes more significant in population dynamics as a limiting factor. Moreover, due to increased growth rates in eutrophied oceans, inorganic carbon depletes faster. An in silico literature research on the the affinity for phosphate, nitrate and inorganic carbon in marine diatom and dinoflagellate species gave insights in species distribution, based on in vivo uptake kinetics, field measurements and uptake mechanisms of both taxonomic groups. The affinity for nitrate and inorganic carbon was significantly higher dinoflagellates. This difference could explain the species composition in marine environments. According to findings in this research, dinoflagellates are better adapted, based on their affinity for nutrients and inorganic carbon, to oligotrophic and Ci depleted environments. 1. Introduction Phytoplankton blooms can severely decrease water quality, threatening drinking water and food supply. Anthropogenic increase of atmospheric carbon dioxide (CO2) concentrations and nutrient enrichment alter hydrological patterns and strongly influence the duration, frequency and intensity of harmful cyanobacterial blooms (HCB’s) (Visser et al, 2016) and harmful algal blooms (HAB’s) (Smith and Schindler, 2009). -
Novel and Rapidly Diverging Intergenic Sequences Between Tandem Repeats of the Luciferase Genes in Seven Dinoflagellate Species1
J. Phycol. 42, 96–103 (2005) r 2005 Phycological Society of America DOI: 10.1111/j.1529-8817.2005.00165.x NOVEL AND RAPIDLY DIVERGING INTERGENIC SEQUENCES BETWEEN TANDEM REPEATS OF THE LUCIFERASE GENES IN SEVEN DINOFLAGELLATE SPECIES1 Liyun Liu and J. Woodland Hastings2 Department of Molecular and Cellular Biology, Harvard University, 16 Divinity Avenue, Cambridge, Massachusetts 02138, USA Tandemly arranged luciferase genes were previ- Our previous studies of the structure of dinoflagel- ously reported in two dinoflagellates species, but lates genes and their circadian regulation revealed that their intergenic regions were strikingly different several occur in tandemly arranged copies (Le et al. and no canonical promoter sequences were found. 1997, Li and Hastings 1998, Okamoto et al. 2001). Here, we examined the intergenic regions of the Other than for ribosomal genes (Sollner-Webb and luciferase genes of five other dinoflagellate species Tower 1986) and a few protein-coding genes in two along with those of the earlier two. In all cases, the protozoa, Trypanosoma brucei and Babesia bovis (Lee and genes exist in multiple copies and are arranged Van der Ploeg 1997, Suarez et al. 1998), such an ar- tandemly, coding for proteins of similar sizes and rangement is not known in other eukaryotes. Indeed, sequences. However, the 50 untranslated region, 30 it is well known that the dinoflagellate nucleus is very untranslated region, and intergenic regions of the unusual; its envelope remains intact throughout the seven genes differ greatly in length and sequence, cell cycle, with the separation of the chromosomes in except for two stretches that are conserved in the mitosis being carried out by an external mitotic spindle intergenic regions of two pairs of phylogenetically (Taylor 1987). -
POL: American Society for Photobiology: Reflections on the 25Th Anniversary of ASP 10/12/11 9:25 AM
POL: American Society for Photobiology: Reflections on the 25th Anniversary of ASP 10/12/11 9:25 AM REFLECTIONS ON THE 25th ANNIVERSARY of the AMERICAN SOCIETY for PHOTOBIOLOGY (1972-1997) By Kendric C. Smith, Founding President of ASP See and hear Kendric Smith introduce his talk (7.6 MB in avi format). It is exciting to realize that the American Society for Photobiology (ASP) is 25 years old. I won't trouble you with all of the early history *, but a few comments might be of interest. When I began studying the photochemistry of the nucleic acids, I didn't know much about photobiology, and didn't know many photobiologists. I thought that it would be rewarding to get together with other photobiologists in the San Francisco Bay Area, so in 1962 I started the Northern California Photobiology and Photochemistry Group (1962-1974). For those who could get away from work early, we had dinner at a local restaurant, and then moved to a classroom at Stanford for the lecture. I learned two very important lessons from running this group for several years. (1) Don't expect a lot of help in running a group. (2) If you organize the meeting and send out the announcements, people will come. These two lessons gave me the courage later to start ASP in the face of considerable opposition. I tried to stimulate the formation of other regional photobiology groups. The Northeast Photobiology Group was started in 1967, with Farrington Daniels, Jr. as its first President. Failing to find a suitable home, this group only met for three years (1967-1970). -
Productivity Is Defined As the Ratio of Output to Input(S)
Institute for Development Policy and Management (IDPM) Development Economics and Public Policy Working Paper Series WP No. 31/2011 Published by: Development Economics and Public Policy Cluster, Institute of Development Policy and Management, School of Environment and Development, University of Manchester, Manchester M13 9PL, UK; email: [email protected]. PRODUCTIVITY MEASUREMENT IN INDIAN MANUFACTURING: A COMPARISON OF ALTERNATIVE METHODS Vinish Kathuria SJMSOM, Indian Institute of Technology Bombay [email protected] Rajesh S N Raj * Centre for Multi-Disciplinary Development Research, Dharwad [email protected] Kunal Sen IDPM, University of Manchester [email protected] Abstract Very few other issues in explaining economic growth has generated so much debate than the measurement of total factor productivity (TFP) growth. The concept of TFP and its measurement and interpretation have offered a fertile ground for researchers for more than half a century. This paper attempts to provide a review of different issues in the measurement of TFP including the choice of inputs and outputs. The paper then gives a brief review of different techniques used to compute TFP growth. Using three different techniques – growth accounting (non-parametric), production function accounting for endogeniety (semi-parametric) and stochastic production frontier (parametric) – the paper computes the TFP growth of Indian manufacturing for both formal and informal sectors from 1989-90 to 2005-06. The results indicate that the TFP growth of formal and informal sector has differed greatly during this 16-year period but that the estimates are sensitive to the technique used. This suggests that any inference on productivity growth in India since the economic reforms of 1991 is conditional on the method of measurement used, and that there is no unambiguous picture emerging on the direction of change in TFP growth in post-reform India.