نتایج جستجو برای: 1998 in 1997
تعداد نتایج: 16996477 فیلتر نتایج به سال:
CONTEXT Although the cost-effectiveness and cost-benefit of influenza vaccination are well established for persons aged 65 years or older, the benefits for healthy adults younger than 65 years are less clear. OBJECTIVE To evaluate the effectiveness and cost-benefit of influenza vaccine in preventing influenza-like illness (ILI) and reducing societal costs of ILI among healthy working adults. ...
[1] The evolution of oceanographic conditions in the upwelling region off northern Chile (18 –24 S) between 1996 and 1998 (including the 1997–1998 El Niño) is presented using hydrographic measurements acquired on quarterly cruises of the Chilean Fisheries Institute, with sea surface temperature (SST), sea level, and wind speeds from Arica (18.5 S), Iquique (20.5 S), and Antofagasta (23.5 S) and...
The genus Sarcocapnos DC., endemic to the western Mediterranean basin, contains seven species, all of which are rare. Monthly monitoring of the number and flowering status of individuals as well as the appearance of new seedlings in five populations of three species, Sarcocapnos baetica (Boiss. & Reuter) Nyman, Sarcocapnos enneaphylla (L.) DC., and Sarcocapnos pulcherrima Morales & Romero-Garcí...
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