Papers by marco hernandez
uated. From the lipophilic extract of C. tenuifolia five active flavones were obtained. 4Ј,5-Dihy... more uated. From the lipophilic extract of C. tenuifolia five active flavones were obtained. 4Ј,5-Dihydroxy-7-methoxyflavone [genkwanin] and 5-hydroxy-4Ј,7-dimethoxyflavone [apigenin 4Ј,7-dimethylether] exhibited the strongest antiplasmodial activity against a chloroquine-sensitive strain (poW) and a chloroquine-resistant strain (Dd2) of Plasmodium falciparum (IC 50 values: 17.1Ð28.5 µm). Furthermore octadeca-9,12-dienoic acid [linoleic acid] {IC 50 values of 21.8 µm (poW) and 31.1 µm (Dd2)} and octadeca-9,12,15-trienoic acid (α-linolenic acid) were isolated.
Waste Management, 2001
The microstructural stability or durability of a speci®c back®lling pozzolanic-cement mortar, whi... more The microstructural stability or durability of a speci®c back®lling pozzolanic-cement mortar, which is employed in Spain, in concrete containers for the storage of low level liquid wastes (LLW) and medium level liquid wastes (MLW), has been studied by means of the Koch±Steinegger test at the temperatures of 20 and 40 C during a period of 365 days. Mortar samples were immersed in salt solutions of 3.46 M NaCl and 3.46 M KCl to simulate the salinity of some radioactive liquid waste matrices. The resistance of the mortar to the saline solution attack is evaluated by the development of the relative¯exural strength. The changes of the microstructure were followed by mercury intrusion porosimetry (MIP), scanning electron microscopy (SEM) and X-ray diraction (XRD). Pore solution was extracted and analyzed at dierent periods of time to know the possible diusion of sodium, chloride and potassium inside the microstructure. #
Waste Management, 2000
Eects of the very concentrated sulphated salts that accompanied the low (LLW) and medium level wa... more Eects of the very concentrated sulphated salts that accompanied the low (LLW) and medium level wastes (MLW), on the cementitious characteristics of materials employed in the Spanish disposal are discussed. The study was carried out according to the KoÈ ch-Steinegger test, at the temperature of 40 C during a period of 365 days. Samples of a speci®c back®lling¯y ash-pozzolanic-cement mortar, were immersed in a simulated radioactive liquid waste very rich in sulphate (2.05 M) and sodium (4.1 M) ions. In addition to the mechanical behavior, the changes of the microstructure characteristics of the mortar were evaluated by X-ray diraction (XRD), mercury intrusion porosimetry (MIP) and extracted pore solution analyses. The results showed the important role played by the¯y ash pozzolanic reactivity which is activated markedly by the ingress of sulphate and sodium ions towards the porous microstructure. Accordingly, the porosity is strongly re®ned and the mechanical properties enhanced. #
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Papers by marco hernandez