Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 30 for “"sea sediments"”.
-
Tracing viable bacteria in Wadden Sea sediments using phospholipid analysis
… different types of lipids from bacteria and sediments. Special emphasis was placed on the analysis of intact phospholipids by HPLC-ESI-MS/MS, because phospholipids appear to be suitable biomarkers to trace viable bacteria. The specificity of phospholipids as biomarkers was tested by …
-
An experimental study of compressional velocities in deep sea sediments
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1960.
-
Reflection of seismic waves at oblique angles from deep sea sediments
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1964.
-
Determination of Amino Acid-N in Deep-Sea Sediments and the Relationship Between Amino Acid Levels in Three Cores From the Argentine Basin and Past Climatic Changes
Made available in DSpace on 2014-12-10T17:12:41Z (GMT). No. of bitstreams: 1 6915282.pdf: 3548143 bytes, checksum: ce558e3d20b91acba4b34513af9c9eb0 (MD5) Previous issue date: 1969
-
The Effect of Historic Shipwrecks on Sediment Microbiomes in the Northern Gulf of Mexico
… methane seeps, wood falls, octocoral, and deep-sea sediments. However, it was unknown if the presence of man-made structures on the seafloor, including historic shipwrecks, also resulted in a distinct core microbiome. To determine how historic shipwrecks impact sediment microbiomes under varying …
-
Expansion of Deltaproteobacteria diversity from marine sediment reveals unique metabolic features
… (MAGs) from a variety of coastal and deep-sea sediments. These 402 Deltaproteobacteria MAGs represent a 28% increase in Deltaproteobacteria genomes. Phylogenomic analyses revealed 12 novel lineages which consist entirely of uncultured representatives. Among these are two lineages that …
-
Chlorophyll diagenesis in the water column and sediments of the Black Sea
… degradation pathways of chlorophyll in the Black Sea water column and sediments. Measurements are made of total chlorophyll in sediment traps from two locations and depths in the water column, and at two locations in surface sediments. Individual chlorophyll degradation products are also …
-
Plutonium isotopes in the North Atlantic
… technique for the analysis of Pu in marine sediments, pore waters, sediment trap material and sea water from the North Atlantic. With the m.s. technique, not only is the detection limit for 239,240Pu increased by over an order-of-magnitude, but the 240Pu and 239Pu isotopes can be separated …
-
The paleoceanography of the Bering Sea during the last glacial cycle
… and planktonic-fauna records from Bering Sea sediment cores, spanning the time period from 50,000 years ago to the present. During Marine Isotope Stage 3 (MIS3) at 30-20 ky BP (kiloyears before present) in a core from 1467m water depth near Umnak Plateau, there were episodic occurrences of …
-
Pliocene-Pleistocene Radiolarian Investigations of the Equatorial Oceans
… to the investigation of Late Cenozoic deep-sea sediments recovered by the Deep Sea Drilling Program (DSDP) and Ocean Drilling Program (OOP), and utilizes these advances in undertaking a detailed palaeoenvironmental study of the Plio-Pleistocene Olduvai magnetosubchron (1.95-1.79Ma) of the …
-
The paleoceanography of the Bering Sea during the last glacial cycle
… and planktonic-fauna records from Bering Sea sediment cores, spanning the time period from 50,000 years ago to the present. During Marine Isotope Stage 3 (MIS3) at 30-20 ky BP (kiloyears before present) in a core from 1467m water depth near Umnak Plateau, there were episodic occurrences of …
-
Investigating laminated sediments of the Al-Azraq basin, Jordan and the implications for paleoenvironmental variability
This research examines cored sediments recovered from the Al-Azraq basin, Jordan for laminated sediments. Laminated sediments have long been recognized from the Dead Sea basin, and determined to be varved deposits, or seasonal couplets forming annual deposits. A current debate in the literature …
-
Deep sea seismic stratigraphy
… for the reflection of seismic waves within deep-sea sediments are shown to be less reliable for the purposes of correlation than their counter-parts in shallow margin sequences. Similar surfaces, such as abrupt lithological changes and unconformities, in the two different realms are not …
-
The Evolution and Impact of Weddell Sea Deep Water
… Sheet is largely marine based and grounded below sea level, which makes it especially vulnerable for sea-level forcing and ocean warming. In turn, the Southern Ocean overturning circulation is partially driven by deep water formation along the Antarctic continent, which is strongly modulated by …
-
The Occurrence of Fish Remains in Modern Lake Systems : A Test of the Stratified-Lake Mode
… predicted by the Stratified-lake Model. This research tested that model by searching for fish remains in 38 collected bottom samples of six modern lacustrine analogues, including Fayetteville Green Lake, New York. The bottom sediments of a warm, holomictic, shallow, and saline lake (Salton Sea, …
-
Variations in the particulate flux of ²³⁰Th and ²³¹Pa and paleoceanograhpic applications of the ²³¹Pa/²³¹Th ratio
… matter collected with sediment traps and in deep-sea sediment cores. New analytical methods for uranium, thorium, and protactinium isotopes by Inductively-Coupled Plasma Spectrometry (ICP-MS) with a conventional Meinhard concentric glass nebulizer were developed. Composite samples from sediment …
-
Assessing the impact of multiple environmental stressors on Atlantic Ocean deep-sea sediment ecosystems functioning.
Earth is a blue planet, and the deep seafloor covers more than 60% of its surface, with the greater majority comprising of soft sediments. Deep soft sediments host a unique and diverse seafloor community and are of major importance to global biogeochemical cycles. As the ocean acts as a major …
-
Orbital and Suborbital Climate Variability during the Pliocene Intensification of Northern Hemisphere Glaciation
… 101-95), using proxy<br/>methods applied to deep-sea sediments in the equatorial oceans and the North Atlantic. In this<br/>way, I evaluate the forcing mechanisms, biogeochemical cycles and climate implications during<br/>the late Pliocene.<br/>In Chapter 2, palaeoproductivity is reconstructed in …
-
STRUCTURAL CHARACTERISATION OF HIGHLY BRANCHED ISOPRENOID ALKENES FROM SEDIMENTS AND ALGAE
… previously reported in estuarine and coastal sediments from locations worldwide. The parent alkane structure has been proven but only a few of the double bond positions established previously. A wide body of evidence suggests that the compounds have a diatomaceous origin, with one report in …
-
Element cycling in organic rich sediments on the Pakistan margin
Benthic biogeochemical processes in ocean margin sediments are of global<br/>significance, yet they remain poorly defined. Here, the distribution of major, minor and trace elements in porewaters and sediments, together with measurements of microbiallymediated organic carbon oxidation reactions were …
Page 1 of 2