Flow from some springs in former glacial lakebeds of the Upper Midwest is extremely steady throughout the year and does not increase significantly after precipitation events or seasonal recharge. Analytical and simplified numerical models of spring systems were used to determine whether preferential ground water flow through high-permeability features in shallow sandstone aquifers could produce typical values of spring discharge and the unusually steady rates of spring flow. The analytical model is based on a one-dimensional solution for periodic ground water flow. Solutions to this model suggest that it is unlikely that a periodic forcing due to seasonal variations in areal recharge would propagate to springs in a setting where high-permeability features exist. The analytical model shows that the effective length of the aquifer, or the length of flowpaths to a spring, and the total transmissivity of the aquifer have the greatest potential to impact the nature of spring flow in this setting. The numerical models show that high-permeability features can influence the magnitude of spring flow and the results demonstrate that the lengths of ground water flowpaths increase when high-permeability features are explicitly modeled, thus decreasing the likelihood for temporal variations in spring flow.
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http://dx.doi.org/10.1111/j.1745-6584.2004.tb02728.x | DOI Listing |
J Dairy Sci
December 2024
Department of Food Technology and Inspection, School of Veterinary Medicine, Federal University of Minas Gerais, Brazil; Avenida Antônio Carlos, 6627, Pampulha, Belo Horizonte, Minas Gerais, Brazil. 31270-901; Laboratory of Milk Quality Analysis; School of Veterinary Medicine, Federal University of Minas Gerais, Brazil; Avenida Antonio Carlos, 6627, Pampulha, Belo Horizonte, Minas Gerais, Brazil. 31270-901. Electronic address:
Despite buffalo milk being an important food worldwide, not much is known about factors that influence its quality on Brazilian buffalo milk farms. It ranks second in total volume of milk production, with cow milk in first place, but a lack of minimum legal parameters for buffalo milk is another problem faced by some countries, as it happens in Brazil where buffalo population represents less than one percent of dairy cows, even though Brazilian buffalo herd is one of the largest in Latin America, with a successful dairy processing chain. This study investigated the composition and somatic cell counts (SCC) of buffalo milk produced in a high-altitude tropical region in the State of Minas Gerais, Brazil, where buffalo calving naturally happens from February to May.
View Article and Find Full Text PDFFront Plant Sci
December 2024
Department of Plant Sciences, University of Saskatchewan, Saskatoon, SK, Canada.
Decades of wheat breeding have provided growers with numerous high-yielding options, but it is unknown if these yield improvements are likewise characterized with improved nitrogen use efficiency (NUE). Fertilizer nitrogen (N) is an ever-increasing expense, so improving NUE by reducing the requirement for N fertilizer without risking yield and quality is necessary. The goal of our research is to identify cultivars and associated traits that may improve NUE while maintaining productivity.
View Article and Find Full Text PDFMar Pollut Bull
December 2024
LARSys, Universidade do Algarve, Estr. da Penha, Faro 8005-139, Portugal.
Ocean noise generated by human activities at sea has been increasing over the decades, affecting marine ecosystems. Ship traffic flow between the Mediterranean or South Atlantic and northern Europe makes the coast of Portugal one of the most intense shipping highways on a global scale. Among the cetaceans of the coast of Portugal, the common dolphin (Delphinus delphis) was selected as a target species.
View Article and Find Full Text PDFMaterials (Basel)
November 2024
Department of Physical Aspects of Ecoenergy, The Institute of Fluid-Flow Machinery Polish Academy of Sciences, Fiszera 14 St., 80-231 Gdańsk, Poland.
Leather waste contains up to 10% nitrogen (N); thus, combustion or gasification only for the energy recovery would not be rational, if safety standards are met. On the other hand, the chromium (Cr) content exceeding 5% in half of the waste stream (/) is too significant to be applied in agriculture. In this work, four acid hydrolysates from leather waste shavings, both wet-white free of Cr and wet-blue with Cr, were used: two with a mixture of acids and supplemented with Cu, Mn, and Zn, and the other two as semi-products from collagen extraction using hydrochloric acid.
View Article and Find Full Text PDFImmunol Lett
December 2024
Laboratory of Clinical Pathology, Azienda Sanitaria Universitaria Integrata, Udine, Italy.
Objective: Idiopathic inflammatory myopathies (IIM) are a heterogeneous group of systemic autoimmune disorders affecting skeletal muscles but also other organs. There are different forms of IIM, each with peculiar clinical manifestations and prognosis. Accordingly, several autoantibodies have been described in IIM, with different prevalence in the different forms of the disease.
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