234 research outputs found

    Isolation and culture in artificial media of Lagenidium from Penaeus monodon larvae

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    Fungal infection of P. monodon larvae is a problem in hatchery operations. The fungus, which attacks the nauplius to postlarval stages and causes up to 100% mortality, has been tentatively identified as belonging to the genus Lagenidium . This pathogenic organism has recently been isolated and cultured. A description is given of the fungus, and features of its biology and pathology are discussed

    Current Recommendations on Diagnosis and Management of Right-Sided Diverticulitis

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    We present the case of a 52-year-old female with recurrent symptomatic ascending colon diverticulitis who ultimately underwent elective laparoscopic right hemicolectomy. The following is a case report and literature review pertaining to right colonic diverticular disease

    Systematic Literature Review on Global Strategy

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    The global economy changed the way products and services are exchange and reminded organizations' managers to find new ways to obtain competitive advantage and formulate their strategy in the global market. Thus, this chapter's aim is to perform a systematic literature review to identify the main theoretical topics of global strategy in the past 43 years using bibliometric analysis. The results allowed to identify and cluster five main trends: Cluster 1 – firm performance in the global market; Cluster 2 – power and market space development; Cluster 3 – government regulation, government and regulation; Cluster 4 – economic periods; Cluster 5 – societal changes. Findings also allowed to find potential gaps in global strategy related with the topics of entrepreneurship, competitive strategy, capitalism, transitions, climate change, law, portfolio, financial performance, global sourcing, and global value chain. Conclusions are drawn

    Estimating geological CO2 storage security to deliver on climate mitigation

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    Carbon capture and storage (CCS) can help nations meet their Paris CO2 reduction commitments cost-effectively. However, lack of confidence in geologic CO2 storage security remains a barrier to CCS implementation. Here we present a numerical program that calculates CO2 storage security and leakage to the atmosphere over 10,000 years. This combines quantitative estimates of geological subsurface CO2 retention, and of surface CO2 leakage. We calculate that realistically well-regulated storage in regions with moderate well densities has a 50% probability that leakage remains below 0.0008% per year, with over 98% of the injected CO2 retained in the subsurface over 10,000 years. An unrealistic scenario, where CO2 storage is inadequately regulated, estimates that more than 78% will be retained over 10,000 years. Our modelling results suggest that geological storage of CO2 can be a secure climate change mitigation option, but we note that long-term behaviour of CO2 in the subsurface remains a key uncertainty

    Methane fluxes between terrestrial ecosystems and the atmosphere at northern high latitudes during the past century : a retrospective analysis with a process-based biogeochemistry model

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    Author Posting. © American Geophysical Union, 2004. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Global Biogeochemical Cycles 18 (2004): GB3010, doi:10.1029/2004GB002239.We develop and use a new version of the Terrestrial Ecosystem Model (TEM) to study how rates of methane (CH4) emissions and consumption in high-latitude soils of the Northern Hemisphere have changed over the past century in response to observed changes in the region's climate. We estimate that the net emissions of CH4 (emissions minus consumption) from these soils have increased by an average 0.08 Tg CH4 yr−1 during the twentieth century. Our estimate of the annual net emission rate at the end of the century for the region is 51 Tg CH4 yr−1. Russia, Canada, and Alaska are the major CH4 regional sources to the atmosphere, responsible for 64%, 11%, and 7% of these net emissions, respectively. Our simulations indicate that large interannual variability in net CH4 emissions occurred over the last century. Our analyses of the responses of net CH4 emissions to the past climate change suggest that future global warming will increase net CH4 emissions from the Pan-Arctic region. The higher net CH4 emissions may increase atmospheric CH4 concentrations to provide a major positive feedback to the climate system.This study was supported by a NSF biocomplexity grant (ATM-0120468), the NASA Land Cover and Land Use Change Program (NAG5-6257), and by funding from MIT Joint Program on the Science and Policy of Global Change, which is supported by a consortium of government, industry, and foundation sponsors
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