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Articles 4591 - 4620 of 5630
Full-Text Articles in Entire DC Network
Man And His Environment: The Ecological Limits Of Optimism, R. S. Miller, G. M. Woodwell, W. R. Burch, P. A. Jordan, R. L. Means
Man And His Environment: The Ecological Limits Of Optimism, R. S. Miller, G. M. Woodwell, W. R. Burch, P. A. Jordan, R. L. Means
Yale School of the Environment Bulletin Series
No abstract provided.
Natural Variation In Susceptibility Of Pinus To Neodiprion Sawflies As A Basis For The Development Of A Breeding Scheme For Resistant Trees, Walter R. Henson, Louis C. O'Neil, Francois Mergen
Natural Variation In Susceptibility Of Pinus To Neodiprion Sawflies As A Basis For The Development Of A Breeding Scheme For Resistant Trees, Walter R. Henson, Louis C. O'Neil, Francois Mergen
Yale School of the Environment Bulletin Series
No abstract provided.
Seawater Alkalinity Determination By The Ph Method, Charles Culberson, R. M. Pytkowicz, J. E. Hawley
Seawater Alkalinity Determination By The Ph Method, Charles Culberson, R. M. Pytkowicz, J. E. Hawley
Journal of Marine Research
The coefficient fH used in the seawater alkalinity method of Anderson and Robinson (1946), has been redetermined at 25°C. We have found that fH = 0.741 ±0,005 for salinities between 30‰ and 41‰….
Fine-Sediment Dispersal In The Gulf Of San Miguel, Western Gulf Of Panama: A Reconnaissance, Donald J.P. Swift, R. Gordon Pirie
Fine-Sediment Dispersal In The Gulf Of San Miguel, Western Gulf Of Panama: A Reconnaissance, Donald J.P. Swift, R. Gordon Pirie
Journal of Marine Research
The Gulf of San Miguel, 30 km wide at its mouth and extending 40 km inland, is the estuary of river systems that drain eastern Panama. The Gulf consists of a central scour channel up to 36 m deep, flanked by semicircular bays. The tide has a range of up to 7 m, and maximum surface tidal currents average 200 cm/sec on the flood tide and 230 cm/sec on the ebb tide....
Circulation In The Amazon River Estuary And Adjacent Atlantic Ocean, Ronald J. Gibbs
Circulation In The Amazon River Estuary And Adjacent Atlantic Ocean, Ronald J. Gibbs
Journal of Marine Research
A preliminary survey of the water circulation in the Amazon estuary and adjacent ocean was conducted during both low-river and high-river dischar ge. Results indicate that, due to the river's large discharge, no salt-water wedge (35‰) enters the Amazon estuary during either low-river or high-river discharge....
The Distribution Of Mesopelagic Fishes In The Equatorial And Western North Atlantic Ocean, Richard H. Backus, James E. Craddock, Richard L. Haedrich, David L. Shores
The Distribution Of Mesopelagic Fishes In The Equatorial And Western North Atlantic Ocean, Richard H. Backus, James E. Craddock, Richard L. Haedrich, David L. Shores
Journal of Marine Research
Examination of about 290 midwater trawl hauls made to a depth of 1000 m in the equatorial and western North Atlantic Ocean from 1961 to 1968 suggests that at least 10 physical boundaries determine the ranges of mesopelagic fishes. The boundaries delimit six pelagic regions----the Slope Water Region, the Northern Sargasso Sea, the Southern Sargasso Sea, the Gulf of Mexico, the Caribbean Sea, and the Amazonian Region----and partly delimit four others----the Eastern Gyre and the Labrador, Lesser Antillean, and Guinean regions....
The Equatorial Undercurrent At 170°E In March And April 1967, Philippe Hisard, Jacques Merle, Bruno Voituriez
The Equatorial Undercurrent At 170°E In March And April 1967, Philippe Hisard, Jacques Merle, Bruno Voituriez
Journal of Marine Research
In 1967 the R. V. CORIOLIS undertook five cruises along the 170°E meridian in order to investigate the relationships between the sea-surface conditions and the occurrence of the Equatorial Undercurrent; this paper deals primarily with the March and April cruises. The Equatorial Undercurrent was observed as a double-cell structure....
Interferon Production As A Manifestation Of Delayed Hypersensitivity, Leonard M. Milstone
Interferon Production As A Manifestation Of Delayed Hypersensitivity, Leonard M. Milstone
Yale Medicine Thesis Digital Library
No abstract provided.
Quasielastic Light Scattering From Macromolecules, Stuart Brian Dubin
Quasielastic Light Scattering From Macromolecules, Stuart Brian Dubin
Yale Medicine Thesis Digital Library
No abstract provided.
Chemical Analyses Of Plant Tissues From The Hubbard Brook Ecosystem In New Hampshire, Gene E. Likens, F. Herbert Bormann
Chemical Analyses Of Plant Tissues From The Hubbard Brook Ecosystem In New Hampshire, Gene E. Likens, F. Herbert Bormann
Yale School of the Environment Bulletin Series
No abstract provided.
The Decay And Stability Of Internal Wave Modes In A Multisheeted Thermocline, Bryan Johns, Michael J. Cross
The Decay And Stability Of Internal Wave Modes In A Multisheeted Thermocline, Bryan Johns, Michael J. Cross
Journal of Marine Research
Internal wave motions are considered in a thermocline that consists of thin sheets across which there are abrupt changes in the density. These sheets are separated by homogeneous layers of water in which there is turbulent mixing. Investigations have been undertaken to determine the dependence of both the rate of energy dissipation and the dynamical stability upon the number of sheets in the thermocline....
Concentrations Of Particulate Iron In Atlantic Open-Ocean Water, Peter R. Betzer, Michael E.Q. Pilson
Concentrations Of Particulate Iron In Atlantic Open-Ocean Water, Peter R. Betzer, Michael E.Q. Pilson
Journal of Marine Research
Measurements of particulate iron concentrations have been carried out on samples from the western Atlantic Ocean and the Caribbean Sea. Water samples were collected in 30-l Niskin bottles; iron analyses were done by atomic absorption spectroscopy. The average of 184 iron determinations on shallow open-ocean water (0-300 m) was 0.177 µg/l; the average of 112 determinations on deep water (500-7535 m) was 0.255 µg/l....
A New Genus And Species Of Osmylidae (Neuroptera) From Chile And Argentina, With A Discussion Of Planipennian Genitalic Homologies, Phillip A. Adams
A New Genus And Species Of Osmylidae (Neuroptera) From Chile And Argentina, With A Discussion Of Planipennian Genitalic Homologies, Phillip A. Adams
Postilla
Phymatosmylus, a new genus of Stenosmylinae, is proposed for the new species Phymatosmylus caprorum. The genus is morphologically primitive in the position of the medial fork of the forewing, and in the partially free eighth abdominal tergite of the male. Osmylid female genitalia are prepared for examination by the customary clearing in KOH and staining in chlorazol black E, but removal of the internal structures from the abdomen, following cutting around the genital opening, makes details more visible than when examined in situ, as previously. The male gonarcus-mediuncus complex of Planipennia is probably derived from fused parameres, as in some …
The Anatomy And Internal Architecture Of The Muscles Of Mastication In Didelphis Marsupialis, Karen Hiiemae
The Anatomy And Internal Architecture Of The Muscles Of Mastication In Didelphis Marsupialis, Karen Hiiemae
Postilla
The anatomy and internal architecture of the jaw musculature in Didelphis marsupialis, the American opossum, was studied using a combination of dissection and thick sectioning techniques. Since the purpose of this investigation was to provide detailed anatomical information as a basis for subsequent functional studies of jaw activity, all muscles associated with normal feeding and ancillary oral behaviour are described. These muscles are the temporal, masseter, pterygoids, digastric, mylohyoid, the remaining suprahyoid muscles and part of the extrinsic tongue musculature. In mammals, the jaw muscles medial to the superficial masseter are classically regarded as the temporal, masseter and zygomatico-mandibular; however, …
Occlusion In Docodon (Mammalia, Docodonta), Farish A. Jenkins Jr.
Occlusion In Docodon (Mammalia, Docodonta), Farish A. Jenkins Jr.
Postilla
The pattern of molar occlusion in the Late Jurassic mammal genus Docodon was determined by "mapping" the wear facets on all known upper and lower dentitions. The coincidence of lower and upper molar wear is evidence that the proposed occlusal pattern is correct. The lingual halves of the upper molars occlude in the lower intermolar basins formed by the adjacent halves of lower molars. The buccal halves of upper molars pass buccally to the lower molar row. The disposition of opposing cusps and crests, and the verticality of most wear facets, rieveals that molar function was primarily shearing rather than …
Gigantopithecus (Pongidae, Hominoidea) A New Species From North India, E. L. Simons, S. R.K. Chopra
Gigantopithecus (Pongidae, Hominoidea) A New Species From North India, E. L. Simons, S. R.K. Chopra
Postilla
A nearly complete mandible of Gigantopithecus representing a new species, Gigantopithecus bilaspurensis, is described. The specimen lacks incisors, left P4 and the posterior portions of both rami. Even so, it is the most complete Pre-Pleistocene hominoid mandible ever found in the Indian subcontinent. Found in the Dhok Pathan beds northwest of Haritalyangar, India, it is of middle Pliocene age. It is also the most complete higher primate mandible of its age known from any site in the world. In various ways the new specimen resembles species of Australopithecus, Ramapithecus and Dryopithecus more than does the specialized Chinese Pleistocene species Gigantopithecus …
New Genera And Species Of Coralline Sponges (Porifera) From Jamaica, Willard D. Hartman
New Genera And Species Of Coralline Sponges (Porifera) From Jamaica, Willard D. Hartman
Postilla
Three new genera including four new species of coralline sponges from Jamaica are described. The sponges are characterized by a compound skeleton of aragonite, siliceous spicules and organic fibrous elements and are related to Astrosclera, Merlia and Ceratoporella.
The Population Question In Northeast Brazil: Its Economic And Ideological Dimensions, Herman E. Daly
The Population Question In Northeast Brazil: Its Economic And Ideological Dimensions, Herman E. Daly
Discussion Papers
No abstract provided.
New Species And Synonymy In The Genus Meleoma (Neuroptera, Chrysopidae), With A Discussion Of Genitalic Homologies, Phillip A. Adams
New Species And Synonymy In The Genus Meleoma (Neuroptera, Chrysopidae), With A Discussion Of Genitalic Homologies, Phillip A. Adams
Postilla
Three new species of Meleoma are described, carapana from Mexico, poolei from Venezuela, and festivata from Colombia. M. dolicharthra (Navás) ( = M. cavifrons Banks, new synonymy) is redescribed; M. tezcucana (Banks) (from Chrysopa) new combination, is recorded from Arizona. The pseudopenis of Chrysopidae is homologous to the mediuncus; the secondary mediuncus of Meleoma derives from fused gonocoxite dorsal horns as found in M. poolei, members of Chrysopa s. str., and the Chrysopa lineaticornis group.
The Status Of The Genera Ecpleopus, Arthroseps, And Aspidolaemus (Sauria, Teiidae), Thomas Uzzell
The Status Of The Genera Ecpleopus, Arthroseps, And Aspidolaemus (Sauria, Teiidae), Thomas Uzzell
Postilla
The genus Ecpleopus is diagnosed within Group II of the Teiidae by the elongate, keeled dorsal scales arranged in diagonal and transverse rows, smooth ventral scales in diagonal and transverse rows, first superciliary elongate, first supraocular in contact with the frontonasal and loreal, and superciliary series incomplete so that only first and fourth supraoculars are separated from the palpebrals. The usual presence of plicae on the anterior part of the tongue suggests relationships with Ptychoglossus and Alopoglossus, which are distinctive within Group II because they have completely plicate tongues. Leposoma and Arthrosaura also appear to be related to Ecpleopus. The …
Comments On The Avifauna Of Tanzania, Ii, S. Dillon Ripley, Gerd H. Heinrich
Comments On The Avifauna Of Tanzania, Ii, S. Dillon Ripley, Gerd H. Heinrich
Postilla
Buccanodon olivaceum ulugurensis and Viridubucco leucomystax meridionalis (both Capitonidae), new subspecies, are described on the basis of morphological characters. Evidence is presented that Dendropicos fuscescens (Vieillot) and Dendropicos lafresnayi Malherbe ( = D. f. lafresnayi Malherbe) are distinct taxa. The distribution of Smithornis capensis (Smith) is redefined based on an examination of a large series of specimens from eastern Africa. Smithornis capensis meinertzhageni van Someren, S. c. suahelicus Grote, S. c. shimba van Someren, and S. c. chyulu van Someren are reinstated as valid subspecies and a key to their identification is given. Macrodipteryx longipennis (Shaw) is recorded as new …
A Probable Pteridosperm With Eremopterid Foliage From The Allegheny Group Of Northern Pennsylvania, T. Delevoryas, T. N. Taylor
A Probable Pteridosperm With Eremopterid Foliage From The Allegheny Group Of Northern Pennsylvania, T. Delevoryas, T. N. Taylor
Postilla
Compressed fossilized foliage most comparable to that of Eremopteris zamioides (Bertrand) Kidston occurs in shale associated with coal in the Allegheny Group in northern Pennsylvania. In association with this foliage are abundant samaropsid seeds and small, apparently microsporangiate organs. Although close proximity of disconnected plant parts as fossils is not evidence in itself that these plant parts were originally connected, it is tempting to believe that these leaves, seeds, and microsporangia were parts of the same species. Furthermore, there have been a number of previous reports associating samaropsid seeds with Eremopteris. Additional frondlike structures with the same basic construction as …
New Species And Records Of Shallow Water Demospongiae From Barbados, West Indies, George John Hechtel
New Species And Records Of Shallow Water Demospongiae From Barbados, West Indies, George John Hechtel
Postilla
Descriptions are given of eleven species of Demospongiae collected off Barbados, W.I. Five are new species and four are new records for this locality. New species are Strongylophora dendyi, Coelosphaera raphidifera, Monanchora barbadensis, Bubaris ammosclera, and Timea stenosclera.
The Pelvic Musculature Of The Dinosaur Hypsilophodon (Reptilia: Ornithischia), Peter M. Galton
The Pelvic Musculature Of The Dinosaur Hypsilophodon (Reptilia: Ornithischia), Peter M. Galton
Postilla
Evidence is provided to show that: 1) the prepubic process, diagnostic of an ornithischian, did not provide the main support for the abdomen; 2) the abdomen was large and extended ventral to the pelvic girdle with a strong M. rectus abdominis that was not functionally replaced by the lateral abdominal muscles; 3) either the M. pubo-tibialis or the ventral part of the M. puboischio-femoralis internus originated on the lateral surface of the prepubic process. An important femoral protractor, the anterior part of the M. pubo-ischio-femoralis externus, had to be functionally replaced before the pubis changed position to lie close to …
Work Effort, Investible Surplus And The Inferiority Of Competition, Edgar O. Edwards
Work Effort, Investible Surplus And The Inferiority Of Competition, Edgar O. Edwards
Discussion Papers
No abstract provided.
A Serological Study Of Eight Nigerian Group Simbu Arbovirus Isolates, C. E. Long Iii
A Serological Study Of Eight Nigerian Group Simbu Arbovirus Isolates, C. E. Long Iii
Yale Medicine Thesis Digital Library
n/a
Karyological Heterogamety Of Deep-Sea Fishes, T. R. Chen
Karyological Heterogamety Of Deep-Sea Fishes, T. R. Chen
Postilla
Among 25 deep-sea fish species karyologically investigated, digamety is confirmed in 12. Observations were based on the consistent appearance of heteromorphic chromosome pairs, of asymmetrical and atypically behaving "sex" bivalents, and of two different chromosome counts from metaphase II. The occurrence of such digamety in other lower vertebrates is discussed. It occurs more frequently among teleostean fishes and other lower vertebrates than previously expected.
A New Genus And Species Of Teiid Lizard From Bolivia, Thomas Uzzell
A New Genus And Species Of Teiid Lizard From Bolivia, Thomas Uzzell
Postilla
Opipeuter xestus, new genus, new species, is placed in Group II of the family Teiidae (Squamata, Reptilia) because it has five clawed digits on all four feet, the nasals separated by a frontonasal, and the nostril pierced in the middle of the nasal scale. It differs from other known members of Group II in having the combination of total absence of keeled scales and a relatively enormous transparent disc in the lower eyelid. The arrangement of enlarged calcareous spines in the hemipenis distinguishes the new taxon; enlarged spines are present on the basal part of the median welt, and in …
A New Theropod Dinosaur From The Lower Cretaceous Of Montana, John H. Ostrom
A New Theropod Dinosaur From The Lower Cretaceous Of Montana, John H. Ostrom
Postilla
Deinonychus antirrhopus, a new genus and species of theropod dinosaur is described from the Cloverly Formation (Lower Cretaceous) of southern Montana. The species is characterized by a highly specialized pes bearing a very large, trenchant claw on digit II, a highly raptorial manus with a very mobile carpus, and a specialized caudal series with extremely long prezygapophyseal and chevron rods. The new species is closely related to Dromaeosaurus albertensis, which features similar specialization of the second pedal digit, and is referred to the family Dromaeosauridae (=Dromaeosaurinae Matthew and Brown, 1922). Other species with comparable pes structure that may be referred …
Long Waves Along A Single-Step Topography In A Semi-Infinite Uniformly Rotating Ocean, J. C. Larsen
Long Waves Along A Single-Step Topography In A Semi-Infinite Uniformly Rotating Ocean, J. C. Larsen
Journal of Marine Research
The dispersion equation for Kelvin-type waves for a single-step topography is derived. Solutions for this equation indicate that, in addition to the Kelvin-type waves, there also exist quasigeostrophic waves that are related to the topography structure.