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Articles 7051 - 7080 of 8517
Full-Text Articles in Entire DC Network
The Relative Magnitude Of Biological And Physical Sediment Reworking In An Intertidal Community, Jonathan Grant
The Relative Magnitude Of Biological And Physical Sediment Reworking In An Intertidal Community, Jonathan Grant
Journal of Marine Research
Tidal sediment reworking was compared to biogenic reworking by benthic-feeding fishes and macrofaunal invertebrates on an intertidal sandflat in South Carolina. Flume-determined rates of ripple migration were combined with field measurements of current velocity to characterize physical reworking. Bioturbation by dasyatid rays was measured by counting newly formed feeding excavations at low tide. On both an areal and volumetric basis, ray reworking amounted to <1% of that reworked by ripple migration. Approximately 30% of the sediment surface was covered by feeding pits during the July maximum of ray activity, with only a small proportion of these newly formed per day. Sediment ingestion by the hemichordate Saccoglossus kowalevskii, was less important than ray bioturbation in comparison to tidal sediment reworking. Sediment displacement by free-burrowing haustoriid amphipods was estimated to be important relative to other biogenic sources, but still <1% of the disturbance produced by bedform migration. However, an abundant infaunal species, the polychaete Paraonis fulgens, …
Environmental Heterogeneity And Plankton Community Structure In The Central North Pacific, T. L. Hayward, E. L. Venrick, J. A. Mcgowan
Environmental Heterogeneity And Plankton Community Structure In The Central North Pacific, T. L. Hayward, E. L. Venrick, J. A. Mcgowan
Journal of Marine Research
Spatial and temporal patterns of heterogeneity in nutrients (PO4, NO3), integrated water column chlorophyll, integrated water column primary production, and macrozooplankton biomass in the central North Pacific are described on spatial scales ranging from less than one to several thousand kilometers and on temporal scales from one day to 12 years. Fluctuations in these properties represent an index of the biological response of the ecosystem to physical forcing on various scales. These patterns are an important aspect of ecosystem structure because environmental perturbations may affect the outcome of biological interactions between populations. Heterogeneity in each property …
Devaluation: A Critical Appraisal Of Imf’S Policy Prescriptions, Louka T. Katseli
Devaluation: A Critical Appraisal Of Imf’S Policy Prescriptions, Louka T. Katseli
Discussion Papers
No abstract provided.
Federalism, Reapportionment And Innovation: The Case Of Agricultural Research And Extension, Susan Rose-Ackerman, Robert Evenson
Federalism, Reapportionment And Innovation: The Case Of Agricultural Research And Extension, Susan Rose-Ackerman, Robert Evenson
Discussion Papers
No abstract provided.
An Analysis Of Subsequent Pregnancies In Women Requiring Ovulation Induction, Tammy C. Harris
An Analysis Of Subsequent Pregnancies In Women Requiring Ovulation Induction, Tammy C. Harris
Yale Medicine Thesis Digital Library
No abstract provided.
An Analysis Of Prognostic Staging For Lung Cancer : A New Look, Daniel M. Sosin
An Analysis Of Prognostic Staging For Lung Cancer : A New Look, Daniel M. Sosin
Yale Medicine Thesis Digital Library
No abstract provided.
Effect Of Sea Ice Meltwater On The Alkalinity Of Seawater, E. P. Jones, A. R. Coote, E. M. Levy
Effect Of Sea Ice Meltwater On The Alkalinity Of Seawater, E. P. Jones, A. R. Coote, E. M. Levy
Journal of Marine Research
Alkalinity values in the top few hundred meters in Baffin Bay were about 100 μeq kg—1 above those expected from deeper values when the effect of salinity is removed. This “excess” alkalinity is attributed to calcium carbonate that precipitated from brines in sea ice and was subsequently reintroduced into the water column when the ice melted. The “excess” alkalinity is then used to estimate the amount of sea ice meltwater formed in Baffin Bay.
Liposome Encapsulation Of Interferon : Effects On Anticellular Activity, Michael Tom
Liposome Encapsulation Of Interferon : Effects On Anticellular Activity, Michael Tom
Yale Medicine Thesis Digital Library
No abstract provided.
Helium, Neon, And Tritium In The Black Sea, Z. Top, W. B. Clarke
Helium, Neon, And Tritium In The Black Sea, Z. Top, W. B. Clarke
Journal of Marine Research
Measurements of the 3He/4He ratio, and concentrations of helium, neon, and tritium have been made in samples collected at station 1355 in the Black Sea during the 1975 cruise of R/V Chain. Helium concentrations increase rapidly from 400 m to about 1000 m and then less rapidly below 1000 m. The maximum He concentration excess is about 16% above solubility equilibrium. Neon concentrations are constant, within a few percent of solubility equilibrium, below 400 m. The He-Ne data thus clearly indicate a large component of radiogenic 4He in the deep water from decay of U …
Light-Shade Adaptation And Vertical Mixing Of Marine Phytoplankton: A Comparative Field Study, Paul G. Falkowski
Light-Shade Adaptation And Vertical Mixing Of Marine Phytoplankton: A Comparative Field Study, Paul G. Falkowski
Journal of Marine Research
The hypothesis is examined that the recent light history of phytoplankton contains information about vertical mixing processes in the euphotic zone. Chlorophyll/P700 ratios are used to estimate the degree of light or shade adaptation in natural phytoplankton communities. Along with information about the time- and light-dependent rates of change of chlorophyll/P700 ratios, a model is presented to estimate how recently populations at the surface were at the 1% light depth and vice versa. The model is based on first-order kinetics and employs a temperature correction. The model is used to estimate vertical displacement rates (i.e., piston velocities) on …
On The Mean Dynamical Balances Of The Gulf Stream Recirculation Zone, James C. Mcwilliams
On The Mean Dynamical Balances Of The Gulf Stream Recirculation Zone, James C. Mcwilliams
Journal of Marine Research
The time mean circulation is analyzed at a site on the southern edge of the Gulf Stream Recirculation Zone (31N, 70W) from data taken in the POLYMODE Local Dynamics Experiment. Additional mean quantities are described from a combination of dynamical assertions and inferences. The mean vorticity balance is examined to infer the mean vertical velocity and eddy relative vorticity flux divergence. The vertical velocity is found to be mostly upward and an order of magnitude larger than the downward surface Ekman pumping. In the mean heat, salt, density, and potential vorticity budgets, the mean advections of these quantities are nonzero, …
Comparative Biogeochemistry Of Water In Intertidal Onuphis (Polychaeta) And Upogebia (Crustacea) Burrows: Temporal Patterns And Causes, Robert C. Aller, Josephine Y. Yingst, William J. Ullman
Comparative Biogeochemistry Of Water In Intertidal Onuphis (Polychaeta) And Upogebia (Crustacea) Burrows: Temporal Patterns And Causes, Robert C. Aller, Josephine Y. Yingst, William J. Ullman
Journal of Marine Research
The burrows of macrobenthos represent an important class of sedimentary microenvironments which significantly influence chemical, biological, and physical characteristics of a deposit. In intertidal regions, the time-dependent changes in composition during ebb-tide of water contained in burrows is a sensitive indicator of biogenic and abiogenic chemical reactions in burrow walls and adjacent sediment. Comparison of time series water samples taken from Onuphis jenneri (polychaete) and Upogebia affinis (crustacean) burrows in the same tidal flat demonstrate substantial differences in biogeochemical microenvironments despite the spatial proximity of the two species. Both types of burrows are influenced by the same general kinds of …
On The Variability Of The Loop Current In The Gulf Of Mexico, W. Sturges, J. C. Evans
On The Variability Of The Loop Current In The Gulf Of Mexico, W. Sturges, J. C. Evans
Journal of Marine Research
It is of considerable interest to know to what extent offshore currents may drive flows on the continental shelf. We have used the northernmost position of the Loop Current, from hydrographic data, to piece together a time series 13 years long. This record samples the lowest frequencies well but undersamples the amplitude of variations with periods of ∼8 months by a factor of 2. The "annual" variation of the Loop Current appears to be a relatively broad spectral peak rather than a sharp spectral line. We find as much power at periods near 30 months as at periods near a …
Acute Effects Of Stress Levels Of Counterregulatory Hormones On The Kinetics Of In Vivo Human Protein Metabolism, Judith Adela Melin
Acute Effects Of Stress Levels Of Counterregulatory Hormones On The Kinetics Of In Vivo Human Protein Metabolism, Judith Adela Melin
Yale Medicine Thesis Digital Library
No abstract provided.
An Analysis Of Weight Gain In Pregnancy In Irish Women Using An Anthropometric Index, David P. Norton
An Analysis Of Weight Gain In Pregnancy In Irish Women Using An Anthropometric Index, David P. Norton
Yale Medicine Thesis Digital Library
No abstract provided.
The Effect Of Inhaled Antihistamine On Exercise Induced Asthma, Moshe Rubin
The Effect Of Inhaled Antihistamine On Exercise Induced Asthma, Moshe Rubin
Yale Medicine Thesis Digital Library
No abstract provided.
Philosophical Egoism In Eighteenth Century Moral Thought And Its Relevance To Modern Psychology, Laura Schafer
Philosophical Egoism In Eighteenth Century Moral Thought And Its Relevance To Modern Psychology, Laura Schafer
Yale Medicine Thesis Digital Library
No abstract provided.
Acute Tubular Necrosis : Acid/Base And Urinary Sediment Changes, Maria Schmidt
Acute Tubular Necrosis : Acid/Base And Urinary Sediment Changes, Maria Schmidt
Yale Medicine Thesis Digital Library
No abstract provided.
Mitochondrial Transport And Processing Of Methylmalonyl Coenzyme A Mutase : In Cultured Buffalo Rat Liver Cells, David C. Helfgott
Mitochondrial Transport And Processing Of Methylmalonyl Coenzyme A Mutase : In Cultured Buffalo Rat Liver Cells, David C. Helfgott
Yale Medicine Thesis Digital Library
No abstract provided.
A Randomized Trial Comparing Doxorubicin, Cyclophosphamide, Methotrexate With Leucovorin Rescue, Vincristine, And Cytarabine (Acomla), With Doxorubicin, Cyclophosphamide, Vincristine, Prednisone, And Bleomycin (Chop-B) In The Treatment Of Diffuse Histiocytic Lymphoma, Philip M. Spiro
Yale Medicine Thesis Digital Library
No abstract provided.
Non-Monetary Effects Of The Financial Crisis In The Propagation Of The Great Depression, Ben S. Bernanke
Non-Monetary Effects Of The Financial Crisis In The Propagation Of The Great Depression, Ben S. Bernanke
Documents
No abstract provided.
Growth Analysis Of Pulmonary Metastases In Malignant Melanoma, Charles An-Pin Lim
Growth Analysis Of Pulmonary Metastases In Malignant Melanoma, Charles An-Pin Lim
Yale Medicine Thesis Digital Library
No abstract provided.
A Gentle Heart : The Life Of Helen Taussig, Gerri Lynn Goodman
A Gentle Heart : The Life Of Helen Taussig, Gerri Lynn Goodman
Yale Medicine Thesis Digital Library
No abstract provided.
Thermoregulation In Anorexia Nervosa, April Chang
Thermoregulation In Anorexia Nervosa, April Chang
Yale Medicine Thesis Digital Library
No abstract provided.
Department Of Surgery, Yale University School Of Medicine 1983-1984, Yale School Of Medicine Department Of Surgery
Department Of Surgery, Yale University School Of Medicine 1983-1984, Yale School Of Medicine Department Of Surgery
Yale Department of Surgery Bulletins
Annual report for 1983-1984.
Vertical Motion Of The Thermocline, Nitracline And Chlorophyll Maximum Layers In Relation To Currents On The Southern California Shelf, J. J. Cullen, E. Stewart, E. Renger, R. W. Eppley, C. D. Winant
Vertical Motion Of The Thermocline, Nitracline And Chlorophyll Maximum Layers In Relation To Currents On The Southern California Shelf, J. J. Cullen, E. Stewart, E. Renger, R. W. Eppley, C. D. Winant
Journal of Marine Research
A continuous four-day time series of nitrate concentration, temperature, chlorophyll fluorescence, and currents, sampled at fixed depths, revealed that distributions of temperature and nitrate could be accounted for by vertical motions in the water column associated with the semidiurnal internal tide and internal waves. A probable mixing event was observed: the transport of nitrate into the surface-layer associated with shear instabilities generated by internal waves. On temporal scales of less than a few hours, the variation of chlorophyll fluorescence could also be explained by vertical advection. However, on longer scales, swimming behavior of the phytoplankton assemblage (dominated by Ceratium spp. …
Lagrangian Eddy Statistics From Surface Drifters In The Eastern North Atlantic, Alain Colin De Verdiere
Lagrangian Eddy Statistics From Surface Drifters In The Eastern North Atlantic, Alain Colin De Verdiere
Journal of Marine Research
In 1976–1977, 16 surface drifters were seeded regularly in an area about 100 km in diameter, providing a good opportunity to study diffusion induced by the mesoscale eddies present in this part of the eastern North Atlantic. It is found herein that Taylor's formula relating the diffusivity (rate of dispersion) of marked fluid parcels to the integral of the Lagrangian correlation function is accurate up to 30 days. The diffusivity, initially zero, reaches a plateau after about 10 days. The diffusivities associated with the time scale of the energy containing eddies (30 days) are 2.3 107 cm2/s …
Regulation Of Phytoplankton Communities By Physical Processes In Upwelling Ecosystems, Walker O. Smith, George W. Heburn, Richard T. Barber, James J. O'Brien
Regulation Of Phytoplankton Communities By Physical Processes In Upwelling Ecosystems, Walker O. Smith, George W. Heburn, Richard T. Barber, James J. O'Brien
Journal of Marine Research
Sinking rates of particles were superimposed on the x-z-t current field observed at 15S off the coast of San Juan, Peru in March–May, 1977 to calculate particle trajectories in the upwelling circulation. Vertical velocities were calculated by a modified variational objective analysis technique using the measured onshore and longshore currents in conjunction with the physical constraint of mass continuity. The calculated vertical flow showed considerable temporal and spatial variability, with the mean vertical transport varying by two orders of magnitude over the 16 km wide continental shelf. Changes in direction occurred rapidly (within 24 h) as has been observed for …
Equatorial Ocean Response To Growing And Moving Wind Systems With Application To The Atlantic, R. H. Weisberg, T. Y. Tang
Equatorial Ocean Response To Growing And Moving Wind Systems With Application To The Atlantic, R. H. Weisberg, T. Y. Tang
Journal of Marine Research
Investigation is made into the response of an equatorial ocean to growing and moving zonal wind systems as motivated by observations of maximum upwelling central to the equatorial Atlantic basin and westward progressing thermal and momentum signatures near the surface. Analytical solutions to the linear, reduced gravity, equatorial β-plane equations of motion subject to a long wave approximation are given for three easterly forcing functions: 1) linearly expanding fetch with constant stress, 2) linearly expanding fetch and stress, and 3) constant fetch and stress, translating westward. The results, as they may relate to the equatorial Atlantic Ocean, are discussed.
A Subsurface Particle Maximum Layer And Enhanced Microbial Activity In The Secondary Nitrite Maximum Of The Northeastern Tropical Pacific Ocean, P. C. Garfield, T. T. Packard, G. E. Friederich, L. A. Codispoti
A Subsurface Particle Maximum Layer And Enhanced Microbial Activity In The Secondary Nitrite Maximum Of The Northeastern Tropical Pacific Ocean, P. C. Garfield, T. T. Packard, G. E. Friederich, L. A. Codispoti
Journal of Marine Research
Profiles of light transmission, dissolved oxygen, dissolved nutrients, electron transport system (ETS) activity, temperature and salinity were made in the northeastern tropical Pacific Ocean. A particle maximum at 150–300 m within the oxygen minimum and secondary nitrite maximum was associated with the salinity maximum of Subtropical Subsurface Water. A subsurface maximum in ETS activity was also found to be associated with the secondary nitrite maximum and the particle maximum. Persistence of these features at a constant depth and their location within a minimum in vertical static stability suggest an advective and/or in situ origin for the particles and an in …