Ana Cristobal - Academia.edu (original) (raw)

Papers by Ana Cristobal

Plant Ecology, 2011

Gypsum outcrops of southeastern Spain (Almeria) have been highlighted as the most outstanding for... more Gypsum outcrops of southeastern Spain (Almeria) have been highlighted as the most outstanding for the conservation of Iberian gypsum flora by flora rarity and richness, as vascular as cryptogamic plants. However, plant community distribution patterns according to soil chemical properties have been little studied in these gypsum areas. Spatial distribution pattern of plant communities in gypsum hills and its relation to soil chemical properties was surveyed in this study. Twenty-one plots (5 9 5 m) were settled along a semiarid gypsum gradient in Rio de Aguas Basin. Soil samples were taken from each plot's superficial layer for chemical analysis. Plant canopy cover was sampled at species level.

Acid activation of mechanically and thermally modified kaolins

Materials Research Bulletin, 2009

Kaolinite and kaoliniferous sand were subjected to thermal or mechanical modification and subsequ... more Kaolinite and kaoliniferous sand were subjected to thermal or mechanical modification and subsequent acid activation to obtain amorphous materials. The physico-chemical, mineralogical and morphological properties were characterized. The results for the materials derived from the kaoliniferous sand were similar to those for washed kaolins, the difference was in the amount of kaolinite content in the samples. The mechanical treatment by

Journal of Optometry, 2014

Purpose: To analyze the relationship between the central corneal thickness (CCT) and midperiphera... more Purpose: To analyze the relationship between the central corneal thickness (CCT) and midperipheral corneal thickness (PCT) with the degree of myopia [axial length (AL) and spherical equivalent refractive error (SE)]. Methods: 175 right myopic eyes from 175 patients were divided according to the degree of SE: group #1 (n = 76, <6.00 D), group #2 (n = 72, between 6.00 and 12.00 D) and group #3 (n = 27, >12.00 D). The CCT and PCT (3 mm from the apex to the superior, inferior, nasal and temporal locations) were measured with the Orbscan-II. Relative peripheral index (RPI) was calculated by dividing the PCT by the CCT. The AL was measured with the IOL Master, and the SE was obtained with subjective refraction. Results: AL was 25.18 ± 1.16 mm, 26.59 ± 1.26 mm and 29.45 ± 2.58 mm and SE was −3.31 ± 1.40 D, −8.32 ± 1.64 D and −16.44 ± 4.48 D for groups #1, #2 and #3, respectively. Non-statistically significant differences in central and peripheral corneal thickness were found between groups (P > 0.05 ANOVA). Non-significant relationship was found between central and peripheral corneal thickness with the AL and SE in the three study groups and in the total sample (r < 0.24; P > 0.05). The RPI values were similar between groups without significant difference between groups (P > 0.05 ANOVA). Linear relationship was found between RPI superior location in group #2 (r = −0.23; P = 0.04) and RPI nasal location in group #3 with the EE (r = 0.41; P = 0.03). Conclusion: There are no significant differences among low, moderate and extremely myopic eyes related to the CCT and PCT. Corneal thickness is very similar in myopic eyes with small differences that are not clinically relevant to myopic patient management.

Inter-examiner agreement of the AS-OCT Visante corneal thickness

Journal of Optometry, 2011

Purpose To determine the inter-examiner agreement of the manual values of central and peripheral ... more Purpose To determine the inter-examiner agreement of the manual values of central and peripheral corneal thickness as measured by optical coherence tomography (AS-OCT Visante) and to assess the agreement between AS-OCT Visante pachymetry, Orbscan II ...

$Research paper thumbnail of Repeatability and agreement of ARK-30 autorefraction after cataract surgery$

Repeatability and agreement of ARK-30 autorefraction after cataract surgery

Clinical & Experimental Ophthalmology, 2012

To evaluate the intra-test variability of ARK-30 handheld autorefractor and the agreement with su... more To evaluate the intra-test variability of ARK-30 handheld autorefractor and the agreement with subjective refraction and retinoscopy after uneventful cataract surgery. Prospective and non-randomized study that included 6 visits by patients undergoing uneventful cataract surgery at IOBA (Instituto de Oftalmobiología Aplicada) Eye Institute (University of Valladolid). The mean age of the 79 patients was 66.5years (range 23-90years). For the 124 eyes, the mean spherical equivalent of the sample at baseline visit was -3.59±6.28D (range -21.00D to +4.44D). Automated refraction was performed on follow-up visits 1day and weekly for 4weeks. Retinoscopy and subjective refraction were conducted at the Week 4 follow up. Automated refraction. Sphere, cylinder and mean spherical equivalent, J(0) and J(45) coefficient variabilities were low in all visits. Standard deviations and the limits of agreement were smallest for the last visit. Subjective refraction sphere and cylinder values were more positive than autorefraction by 0.12±0.53D (P=0.031) and 0.23±0.42D (P&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;0.001), respectively. Comparison between autorefraction and retinoscopy showed a similar trend with the sphere and cylinder differences, 0.32±0.77D and 0.38±0.43D (P&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;0.05), respectively. The ARK-30 is sufficiently accurate and repeatable for automated refraction after uneventful cataract surgery. This instrument may be useful for monitoring refractive outcome in these patients.

Iacchus in Plutarch

Plutarch in the Religious and Philosophical Discourse of Late Antiquity, 2012

27. Do not Drink the Water of Forgetfulness (OF 474–477)

Studies of Orphic Fragments, 2011

Jueces, premios y castigos en el Más Allá de Plutarco

Nomos, Kosmos & Dike in Plutarch, 2014

Embaucadores y falsos adivinos en Oráculos de la Pitia 407 B-C

Tychè et Pronoia: la marche du monde selon Plutarque, 2010

En Los oráculos de la Pitia (407B-C) Plutarco cuestiona la actuación de quienes intervienen sobre... more En Los oráculos de la Pitia (407B-C) Plutarco cuestiona la actuación de quienes intervienen sobre las respuestas oraculares para plegarlas a su interés personal porque minan la credibilidad de la mántica y la labor de los verdaderos profesionales del santuario délfico. Plutarco menciona la vinculación con el oráculo de hombres con dotes poéticas que versificaban las respuestas oraculares, de cresmólogos y de oficiantes de cultos orientales. El propósito de la comunicación es analizar quiénes eran esos personajes y las prácticas que ejercían para tratar de determinar su responsabilidad en la decadencia de la mántica.

Instructions for the Netherworld