Nitrate input to a river is largely controlled by land use in its catchment. We compared the information carried by the isotopic signatures of nitrate in 12 Baltic rivers, in relation to the vegetation cover, land use, and fertilization of agricultural land of their catchments. We found isotope values in nitrate ranging from −2 to 14‰ for δ15N and 8 to 25‰ for δ18O. The annual variability of ri...

Sources and sinks of carbon associated with forests depend strongly on the management regime and spatial patterns in potential productivity. Satellite remote sensing can provide spatially explicit information on land cover, standage class, and harvesting. Carbon-cycle process models coupled to regional climate databases can provide information on potential rates of production and related rates ...

The earliest vertebrates all lived in the oceans, long before life conquered land. It is only natural, therefore, that genomes of fish species are important reference points for the understanding of evolution and development of land vertebrates. Recent results from a relatively close relative, the coelacanth, and a widely used model, the zebrafish, are particularly promising, as Michael Gross r...

The use of prairie biomass as a renewable source of energy may constitute an important opportunity to improve the environmental sustainability of managed land. To date, assessments of the feasibility of using prairies for bioenergy production have focused on marginal areas with low yield potential. Growing prairies on more fertile soil or with moderate levels of fertilization may be an effectiv...

OBJECTIVE To assess semen analysis, testicular volume, and hormone levels in fertile and infertile patients with varicoceles and fertile men without varicoceles. DESIGN Retrospective study. SETTING Academic medical center. PATIENT(S) Patients were divided into three groups: fertile men with varicoceles (n = 79), infertile men with varicoceles (n = 71), and fertile men without varicoceles ...

We examined the association between 5 processing speed measures and general cognitive ability in a large (>900) sample of relatively healthy men and women at age 70. The processing speed tests were the Wechsler Digit Symbol-Coding and Symbol Search, simple reaction time, 4-choice reaction time, and inspection time. To inquire whether the processing speed tasks might be biomarkers of cognitive a...

We estimate cross-sectional associations of neighborhood-level disorder, socioeconomic characteristics and social capital with individual-level systemic inflammation, measured as high C-reactive protein (CRP), using Boston Metropolitan Immigrant Health & Legal Status Survey (BM-IHLSS) data-a sample of relatively young, healthy foreign-born Brazilian adults. Logistic regression analyses suggest ...

DPNH cytochrome c reductase activity has been found associated with the MP virus isolated from the infected allantoic fluids or yolk sacs of fertile eggs and treated with trypsin, perfringens toxin, and cobra venom. The corresponding normal tissue enzymes can be nearly completely destroyed by such treatment, also the small activity found in crude preparations of influenza virus is destroyed by ...

The main aim of this research is to find optimum segmentation parameters for extracting different land cover classes. A relatively new segmentation approach, multiresolution segmentation, is being examined using two data sets (Landsat and IRS). Keywordsmultiresolution segmentation; object-based classification; land-cover classification