University of Córdoba (Spain)

About: University of Córdoba (Spain) is a education organization based out in Cordova, Spain. It is known for research contribution in the topics: Population & Catalysis. The organization has 12006 authors who have published 22998 publications receiving 537842 citations. The organization is also known as: University of Córdoba (Spain) & Universidad de Córdoba.

Iron-Deficiency Stress Responses in Cucumber (Cucumis sativus L.) Roots (A Possible Role for Ethylene?)

Abstract: Most dicotyledonous species respond to Fe deficiency by developing several mechanisms known as Fe-deficiency stress responses. To study the regulation of these responses, young cucumber plants (Cucumis sativus L. cv Ashley) were grown in nutrient solution for 11 d, being deprived of Fe during the last 4 or 5 d. Inhibitors of ethylene synthesis (2 or 10 [mu]M aminoethoxyvinylglycine; 10 or 20 [mu]M aminooxyacetic acid; 1, 2, 5, or 10 [mu]M Co2+ as CoCl2) or action (50, 200, or 800 [mu]M Ag+ as silver thiosulfate) were added to the nutrient solution at different times during this period of growth with no Fe. After this period, the reduction of Fe3+ ethylenedi-aminetetraacetate by the roots of entire plants was measured with ferrozine by reading the absorbance at 562 nm after 2 h. The presence of the ethylene inhibitors in the nutrient solution inhibited the Fe-deficiency stress responses ferric-reducing capacity and subapical root swelling. In another experiment, the addition of 1 [mu]M 1-aminocyclopropane-1-carboxylic acid (ACC), a precursor of ethylene synthesis, to the nutrient solution of plants having low ferric-reducing activity increased notably the ferric-reducing capacity and subapical root swelling. Here we show evidence that ethylene plays a role in the development of Fe-deficiency stress responses, since when ethylene synthesis or action was inhibited, the responses were also inhibited, and when a precursor of ethylene (ACC) was added, the responses were increased.

Handling and staging of renal cell carcinoma the international society of urological pathology consensus (ISUP) conference recommendations

Abstract: The International Society of Urologic Pathology 2012 Consensus Conference on renal cancer, through working group 3, focused on the issues of staging and specimen handling of renal tumors. The conference was preceded by an online survey of the International Society of Urologic Pathology members, and the results of this were used to inform the focus of conference discussion. On formal voting a Z65% majority was considered a consensus agreement. For specimen handling it was agreed that with radical nephrectomy specimens the initial cut should be made along the long axis and that both radical and partial nephrectomy specimens should be inked. It was recommended that sampling of renal tumors should follow a general guideline of sampling 1 block/cm with a minimum of 3 blocks (subject to modification as needed in individual cases). When measuring a renal tumor, the length of a renal vein/caval thrombus should not be part of the measurement of the main tumor mass. In cases with multiple tumors, sampling should include at a minimum the 5 largest tumors. There was a consensus that perinephric fat invasion should be determined by examining multiple perpendicular sections of the tumor/perinephric fat interface and by sampling areas suspicious for invasion. Perinephric fat invasion was defined as either the tumor touching the fat or extending as irregular tongues into the perinephric tissue, with or without desmoplasia. It was agreed upon that renal sinus invasion is present when the tumor is in direct contact with the sinus fat or the loose connective tissue of the sinus, clearly beyond the renal parenchyma, or if there is involvement of any endothelium-lined spaces within the renal sinus, regardless of the size. When invasion of the renal sinus is uncertain, it was recommended that at least 3 blocks of the tumor-renal sinus interface should be submitted. If invasion is grossly evident, or obviously not present (small peripheral tumor), it was agreed that only 1 block was needed to confirm the gross impression. Other recommendations were that the renal vein margin be considered positive only when there is adherent tumor visible microscopically at the actual margin. When a specimen is submitted separately as "caval thrombus, "the recommended sampling strategy is to take 2 or more sections to look for the adherent caval wall tissue. It was also recommended that uninvolved renal parenchyma be sampled by including normal parenchyma with tumor and normal parenchyma distant from the tumor. There was consensus that radical nephrectomy specimens should be examined for the purpose of identifying lymph nodes by dissection/palpation of the fat in the hilar area only; however, it was acknowledged that lymph nodes are found in <10% of radical nephrectomy specimens. Copyright

Nitrate assimilation in Chlamydomonas.

Abstract: Ammonium and nitrate are primary nitrogen sources for many organisms. Though the energy cost required for ammonium assimilation is lower than that of nitrate ([2][1]) and many species use ammonium preferentially, nitrate is the nitrogen source most preferred because of its major abundance (about 10

Seed-mediated growth of MOF-encapsulated Pd@Ag core–shell nanoparticles: toward advanced room temperature nanocatalysts

Abstract: The possibility of using inner cavities within metal–organic frameworks (MOFs) as templates for the fabrication of tiny metal nanoparticles (NPs) was attempted in this work. An unprecedented design of Pd@Ag core–shell NPs on MOFs via a seed mediated growth strategy is reported and attributed to the presence of activated physisorbed hydrogen atoms on embedded Pd NPs as reducing agents to selectively direct the deposition of Ag onto Pd while minimizing the Ag self-nucleation. The obtained Pd@Ag core–shell NPs exhibited a significant increase in selectivity in the partial hydrogenation of phenylacetylene as compared to their monometallic counterparts, due to the surface dilution and electron modification of the surface Pd sites by Ag deposition. Pd@Ag NPs also possessed an unprecedented high stability and recyclability in the catalytic reactions, related to the nano-confinement effect and the strong metal–support interaction offered by the MOF framework.