Metal salt catalyzed carbenoids

The interaction of diazomalonic esters with olefins in the presence of homogeneous copper(I) and copper(II) catalyst has been examined as a function of olefin structure, solvent media, ionic strength, catalyst structure and catalyst concentration, using partial rate data. It has been possible to determine the fine mechanistic details of the cycloproponation, C-H insertion and dimer forming reactions. The initial step is displacement of a ligand from copper by diazo compound in a pre-equilibrium, loss of nitrogen in the rate determining step, return of the ligand, displacement of metal from the carbenoid by olefin, followed by collapse to products. Studies revealed the intimate involvement of catalyst with olefin as well as carbene --Abstract, page ii

The Springer group of the southeastern Anadarko basin in Oklahoma /

Thesis (M.S.)--University of Oklahoma, 1964.Seventeen folded maps in pocket.Includes bibliographical references (leaves 31-34

Selection and Use of MySQL in a Database Management Course

This paper presents a case study of the selection and use of a software package for an introductory Database Management course in a typical MIS program. Teachers of Database Management face the challenge of providing their students with meaningful experiences with actual database software. The software selected for use in a database course can generally be categorized as one of three types: commercial enterprise software, such as Oracle or IBM’s DB2; personal database software, such as Microsoft Access; or software available for no cost (including open source software), such as PostgreSQL or MySQL. The advantages and disadvantages of each of these types of software are discussed, as is the selection process utilized in this specific case. The teaching approach examined in detail is the use of MySQL on a Linux platform to allow students to create, modify, populate, and query databases. This approach is shown to have several advantages: the software is available at no cost to the students or the institution; it is configurable and manageable by the course instructor without the need to consult specialized database professionals; it provides an enterprise database experience using Structured Query Language (SQL); and using the Internet, it is available to students from remote computers

FHL2 regulates hematopoietic stem cell functions under stress conditions.

FHL2, a member of the four and one half LIM domain protein family, is a critical transcriptional modulator. Here, we identify FHL2 as a critical regulator of hematopoietic stem cells (HSCs) that is essential for maintaining HSC self-renewal under regenerative stress. We find that Fhl2 loss has limited effects on hematopoiesis under homeostatic conditions. In contrast, Fhl2-null chimeric mice reconstituted with Fhl2-null bone marrow cells developed abnormal hematopoiesis with significantly reduced numbers of HSCs, hematopoietic progenitor cells (HPCs), red blood cells and platelets as well as hemoglobin levels. In addition, HSCs displayed a significantly reduced self-renewal capacity and were skewed toward myeloid lineage differentiation. We find that Fhl2 loss reduces both HSC quiescence and survival in response to regenerative stress, probably as a consequence of Fhl2-loss-mediated downregulation of cyclin-dependent kinase-inhibitors, including p21(Cip) and p27(Kip1). Interestingly, FHL2 is regulated under the control of a tissue-specific promoter in hematopoietic cells and it is downregulated by DNA hypermethylation in the leukemia cell line and primary leukemia cells. Furthermore, we find that downregulation of FHL2 frequently occurs in myelodysplastic syndrome and acute myeloid leukemia patients, raising a possibility that FHL2 downregulation has a role in the pathogenesis of myeloid malignancies

Polymers From The Hydrolysis Of Tetraethoxysilane

The hydrolysis of tetraethoxysilane was studied under various solvent and temperature conditions. A method was developed by which reaction rates can be measured even in the presence of alcohols other than ethanol. The structures of the resulting polymers were dependent upon the reaction conditions employed, those formed at high temperature being highly condensed materials. © 1973

Biodiversity defrosted : unveiling non-compliant fish trade in ethnic food stores

Out of nearly 30,000 teleosts dwelling in our planet’s water bodies, only hundreds of them are commercially exploited and prevail on the global food market. Yet, our estimates of the species actually underpinning global trade is severely hampered by inaccuracy and non-compliance in labelling and reporting. Here, we target ethnic food stores in two British cities (Liverpool and Manchester metropolitan areas), whose numbers are increasing throughout Europe, to examine accuracy of traceability information available to consumers. Despite the existence of thorough EU labelling regulations, we unveil a high level of non-compliance, with a diverse range of poorly-known fish species, often sold without any label, or with erroneous information, as demonstrated by DNA barcoding. Results indicate that about 41% of the samples were mislabelled, in stark contrast with a recent study that, in 2015, found less than 5% mislabelling in EU supermarkets and fishmongers. These results highlight that inspectors and governments might not be fully aware of the wide diversity of fish species traded, indicating the need for a stronger enforcement of the EU labelling legislations. Compliance with regulations is required not only to protect consumers, but also fish stocks, as for many of the species identified in this survey, population assessment is poor or lacking altogether

Rocky Flats Environmental Technology Site: Independent Review and Technical Evaluation of the Soil Sampling Protocols for Site Characterization and Cleanup Confirmation

The objective of this report was to provide an independent review and technical evaluation of the soil sampling protocols used at the Rocky Flats Environmental Technology Site (RFETS) for site characterization and cleanup confirmation. This technical evaluation focuses on (1) the Buffer Zone (BZ), since the National Wildlife Refuge will only include lands contained in the BZ, (2) the surface soils, the primary exposure medium and potential exposure point for Refuge workers and visitors, and (3) the radionuclides of uranium, plutonium, and americium, the contaminants expected to be of primary exposure concern in the Refuge. This research was completed money allocated during Round 6 of the Citizens’ Monitoring and Technical Assessment Fund (MTA Fund). Clark University was named conservator of these works. If you have any questions or concerns please contact us at [email protected]://commons.clarku.edu/rockymtpeace/1001/thumbnail.jp

Direct Mercury Analyzer (DMA) determination of mercury distribution in the sediments of lake Nokoué in Benin Republic-West Africa

Mercury pollution of water bodies constitutes a hazard to both the aquatic life and the populations consuming fishery products. To anticipate the probable eco-toxicological risks that may arise from the largest lake in southern Benin, the present work aims at assessing the mercury status of the sediments of Lake Nokoué, while identifying the areas exposed to anthropogenic mercury contamination. 45 sites were sampled according to a grid plan covering the entire ecosystem of the lake. Employing a Van Veen grab, surface sediments are collected at a depth from 0 to 5 cm in three catches at each site. The composite samples formed at equal mass on the three portions were frozen, lyophilized at - 40 °C, crushed, sieved and homogenized. Fraction less than 63 µm was collected for the mercury content determination by Direct Mercury Analyzer (DMA) operating by atomic absorption according to the US EPA 7473 method. The mercury concentration varies from 1.56 µg/kg to 164.88 µg/kg with an average value of 35.18 µg per kg of sediment. The south-eastern zone of the lake is more concentrated in mercury with a summation of the mercury content of 530.3 µg/kg of sediment. However, the lake has moderate contamination overall (1 ≤ FC ≤ 3). Keywords: Pollution, contamination, mercury, sediment, Lake Nokoué