The Na+/K+ pump in rat hepatocytes is stimulated in response to Ca2+-mobilizing hormones such as [arginine]vasopressin (AVP), angiotensin II and adrenaline, as well as tumour promoters such as 4 beta-phorbol 12 beta-myristate 13 alpha-acetate (PMA). The ability of these agents to increase cellular contents of diacylglycerol and activate protein kinase C may be necessary to observe this response...

In a companion paper (Zhao, H., and S. Muallem. 1995), we describe the relationship between the major Na+,K+, and Cl- transporters in resting pancreatic acinar cells. The present study evaluated the role of the different transporters in regulating [Na+]i and electrolyte secretion during agonist stimulation. Cell stimulation increased [Na+]i and 86Rb influx in an agonist-specific manner. Ca(2+)-...

The study was undertaken to assess the effects of Ni mobilizing bacteria on the plant growth and the uptake of Ni by Brassica juncea and Brassica oxyrrhina. Among a collection of Ni resistant bacterial strains isolated from the non-rhizosphere and rhizosphere soils of Alyssum serpyllifolium and Astragalus incanus at a serpentine site in Bragança, north-east of Portugal, nine strains were select...

Aluminum is a major rock-forming element, but its low solubility in H2O at upper crustal conditions has led to the assumption that it is effectively immobile during fluid–rock interaction in the deep crust and upper mantle. However, new experimental results on Al solubility in H2O–SiO2–NaCl fluids at high pressure and temperature challenge this view. The combined effects of temperature, pressur...

The OriV site of Haemophilus ducreyi mobilizing plasmid pHD147, determined by replication in Escherichia coli polA, is located close to the OriT site. The OriT site, located by recombination-proficient and -deficient cells, and the OriV site map in a region of pHD147 homologous to the beta-lactamase-specifying plasmids of H. ducreyi and Neisseria gonorrhoeae.

Objective: Communities Mobilizing for Change on Alcohol (CMCA) was a randomized 15-community trial of a community organizing intervention designed to reduce the accessibility of alcoholic beverages to youths under the legal drinking age. Method: Data were collected at baseline before random assignment of communities to intervention or control condition, and again at follow-up after a 2.5year in...

Many cellular reactions involve both hydrophobic and hydrophilic molecules that reside within the chemically distinct environments defined by the phospholipid-based membranes and the aqueous lumens of cytoplasm and organelles. Enzymes performing this type of reaction are required to access a lipophilic substrate located in the membranes and to catalyze its reaction with a polar, water-soluble c...

Users of online communities are commonly classified into active members versus lurkers. In this work we experiment with a method designed to encourage lurkers to share their acquired social capital with a community through lightweight contribution. The findings from our experiment demonstrate the importance of exploring new ways lurker populations can offer additional benefits to online communi...

Nomadic information environments have a strong potential to convert e-business into mobile business (m-business). A number of research articles have been published in the literature on mobile commerce and wireless technologies, but very limited research has been reported on actual applications of m-business. The inadequate knowledge of managers and inexperience with mobile applications often ch...

1999). Researchers, natural resource managers, and environmental practitioners face a number of challenges, including how to deal with information “fuzziness,” how to reconcile seemingly contradictory data, how to smooth over geographic and spatial variability or “lumpiness,” and how to consolidate information gathered at different spatial scales. One proposed solution has been to amalgamate di...