Efectividad del Decálogo de prevención cardiovascular en diabéticos / Effectiveness of a Decalogue for cardiovascular prevention in diabetics

INTRODUCCIÓN: Evaluar la efectividad en conocimiento, percepción de control y mejora del riesgo cardiovascular (RCV) mediante la entrega de un Decálogo visual. MATERIAL Y MÉTODOS: Ensayo clínico de intervención educativa, no farmacológico, con grupo control paralelo, aleatorizado, evaluado a ciegas, en pacientes diabéticos tipo 2, realizado en Atención Primaria de Salud. Ambos grupos recibieron una intervención educativa sobre RCV y su grado de control, y el de intervención además un Decálogo visual con los factores de RCV modificables que reflejaba visualmente su grado de control. Incluimos 50 pacientes en cada grupo para detectar una mejora del conocimiento multifactorial del RCV del 50%. Todos los pacientes recibieron un recuerdo telefónico a los 2 meses, evaluando enmascaradamente el conocimiento y la percepción de control del RCV, y al cabo de 6 meses se evaluó de nuevo presencialmente el conocimiento y el control real del RCV. RESULTADOS: Seleccionamos 51 hombres y 49 mujeres, de 62,9 años de edad media, 9,2 años de evolución y escaso nivel educativo (32% sin estudios y 52% estudios primarios). Basalmente, el conocimiento, la percepción y el control del RCV fueron del 55,0, 80,4 y 65,9%, respectivamente. A los 2 meses, el conocimiento aumentó en el grupo del Decálogo un 16,5% más que en el grupo de educación convencional (73,6% vs. 63,2%; p < 0,05); la percepción sobreestimada de control mejoró un 34,5% en el total de la muestra (p < 0,001) sin diferencias entre grupos, aunque mejoró más la concordancia en el grupo del Decálogo. A los 6 meses aumentó el conocimiento globalmente en un 25,6% (p < 0,001), desapareciendo las diferencias iniciales entre grupos. El control final del RCV aumentó globalmente y en el grupo del Decálogo en un 6,4% (p < 0,005) y un 9,4% (p < 0,001), respectivamente. El riesgo SCORE disminuyó significativamente de forma global y en ambos grupos, sin diferencias entre ambos. CONCLUSIONES: La intervención educativa mejora globalmente el conocimiento, la percepción y el control del RCV. El Decálogo de RCV incrementa rápidamente el conocimiento y disminuye la falsa percepción subjetiva de control del RCV, aunque el beneficio se equipara a los 6 meses si las intervenciones educativas persisten

INTRODUCTION: To assess the effects of a visual Decalogue aid on the degree of knowledge, control perception and improvement in cardiovascular risk factors (CVRF). MATERIAL AND METHODS: A Primary care randomised non-pharmacological trial of an educational intervention with a parallel control group, and blind evaluation in type 2 diabetic patients. Both groups received an educational intervention on the management of CVRF. The intervention group also received a visual Decalogue aid that showed the level of control patients have over the modifiable CVRF. A total of 50 patients were included in each group in order to identify an improvement of 50% in the multifactorial knowledge of CVRF. All patients received a reminder telephone call at 2 months, with masked evaluation of knowledge and CVRF control perception. In a 6 months visit the level of knowledge and real control of CVRF were re-evaluated. RESULTS: The study included 51 males and 49 females, with mean age of 62.9 years, a mean disease duration of 9.2 years, and low educational level. The level of knowledge, control perception, and real control at baseline was 55%, 80.4%, and 65.9%, respectively. After 2 months the level of knowledge in the Decalogue group increased by 16.5% more than in the conventional education group (73.6% vs. 63.2%; P < .05) and the overestimated control perception improved by 34.5% (P < .001) with no differences between groups, although concordance was better in the Decalogue group. At 6 months there was an overall increase 25.6% (P < .001) in the level of knowledge, with the previous difference between groups levelling off. The final CVRF control improved overall and in the Decalogue group by 6.4% (P < .005) and 9.4% (P < .001), respectively. The SCORE risk significantly decreased overall with no differences between groups. CONCLUSIONS: The educational intervention improves the overall level of knowledge, perception and control of CVRF. The CVRF Decalogue quickly increases the level of knowledge, and decreases the false subjective risk control perception. The benefit, however, becomes equal at 6 months with ongoing education interventions

[Effectiveness of a Decalogue for cardiovascular prevention in diabetics]. / Efectividad del Decálogo de prevención cardiovascular en diabéticos.

INTRODUCTION: To assess the effects of a visual Decalogue aid on the degree of knowledge, control perception and improvement in cardiovascular risk factors (CVRF). MATERIAL AND METHODS: A Primary care randomised non-pharmacological trial of an educational intervention with a parallel control group, and blind evaluation in type 2 diabetic patients. Both groups received an educational intervention on the management of CVRF. The intervention group also received a visual Decalogue aid that showed the level of control patients have over the modifiable CVRF. A total of 50 patients were included in each group in order to identify an improvement of 50% in the multifactorial knowledge of CVRF. All patients received a reminder telephone call at 2 months, with masked evaluation of knowledge and CVRF control perception. In a 6 months visit the level of knowledge and real control of CVRF were re-evaluated. RESULTS: The study included 51 males and 49 females, with mean age of 62.9 years, a mean disease duration of 9.2 years, and low educational level. The level of knowledge, control perception, and real control at baseline was 55%, 80.4%, and 65.9%, respectively. After 2 months the level of knowledge in the Decalogue group increased by 16.5% more than in the conventional education group (73.6% vs. 63.2%; P<.05) and the overestimated control perception improved by 34.5% (P<.001) with no differences between groups, although concordance was better in the Decalogue group. At 6 months there was an overall increase 25.6% (P<.001) in the level of knowledge, with the previous difference between groups levelling off. The final CVRF control improved overall and in the Decalogue group by 6.4% (P<.005) and 9.4% (P<.001), respectively. The SCORE risk significantly decreased overall with no differences between groups. CONCLUSIONS: The educational intervention improves the overall level of knowledge, perception and control of CVRF. The CVRF Decalogue quickly increases the level of knowledge, and decreases the false subjective risk control perception. The benefit, however, becomes equal at 6 months with ongoing education interventions.

Effect of zein additive on perfume evaporation.

OBJECTIVE: Zein is known to have filmogen properties. We wanted to show if a zein film containing eugenol (eugenol as model) would retain the fragrances, slow their evaporation and therefore produce a long-lasting perception of perfume. METHODS: We added corn zein to eugenol in a hydro-alcoholic solution to form a film in vitro and at the surface of the human skin. We have studied the trapping and release of eugenol from zein film by GC/MS. Also we labelled eugenol with deuterium to image specifically its distribution in the zein film using Secondary Ion Mass Spectrometry technique (NanoSIMS 50). Finally, we applied the zein/D-eugenol formulation onto skin to image the eugenol location on and in skin by SIMS (Secondary Ion Mass Spectrometry). RESULTS: We showed that eugenol evaporation from zein film can be divided in three periods. The first period (≤2 h) corresponds to the simultaneous solvent and eugenol evaporation occurring during film formation. The second period corresponds to the continuous and slow eugenol evaporation during a few hours (about 10 h) but not to its completion. The third period (at least up to 48 h) results from the trapping of eugenol in zein film. After 24 or 48 h, trapped eugenol can be released and evaporated under mechanical deformations of the film. Moreover we showed that zein addition does not favour the eugenol penetration into viable epidermis which may cause allergenic cutaneous reaction. CONCLUSION: The zein additive is safe to use, does not impact the olfactory perception, allows a better perception of the fragrance (long-lasting effect) in a more protective way and can be used in perfume.

Cellular and molecular characterization of IDH1-mutated diffuse low grade gliomas reveals tumor heterogeneity and absence of EGFR/PDGFRα activation.

Diffuse low grade gliomas (DLGG, grade II gliomas) are slowly-growing brain tumors that often progress into high grade gliomas. Most tumors have a missense mutation for IDH1 combined with 1p19q codeletion in oligodendrogliomas or ATRX/TP53 mutations in astrocytomas. The phenotype of tumoral cells, their environment and the pathways activated in these tumors are still ill-defined and are mainly based on genomics and transcriptomics analysis. Here we used freshly-resected tumors to accurately characterize the tumoral cell population and their environment. In oligodendrogliomas, cells express the transcription factors MYT1, Nkx2.2, Olig1, Olig2, Sox8, four receptors (EGFR, PDGFRα, LIFR, PTPRZ1) but not the co-receptor NG2 known to be expressed by oligodendrocyte progenitor cells. A variable fraction of cells also express the more mature oligodendrocytic markers NOGO-A and MAG. DLGG cells are also stained for the young-neuron marker doublecortin (Dcx) which is also observed in oligodendrocytic cells in nontumoral human brain. In astrocytomas, MYT1, PDGFRα, PTPRZ1 were less expressed whereas Sox9 was prominent over Sox8. The phenotype of DLGG cells is overall maintained in culture. Phospho-array screening showed the absence of EGFR and PDGFRα phosphorylation in DLGG but revealed the strong activation of p44/42 MAPK/ERK which was present in a fraction of tumoral cells but also in nontumoral cells. These results provide evidence for the existence of close relationships between the cellular phenotype and the mutations found in DLGG. The slow proliferation of these tumors may be associated with the absence of activation of PDGFRα/EGFR receptors.

Stepwise diagnosis in covert hepatic encephalopathy: critical flicker frequency and MELD-score as a first-step approach.

BACKGROUND: The diagnosis of covert hepatic encephalopathy (CHE) by means of portosystemic encephalopathy syndrome (PSE) test is costly and therefore infrequently performed. AIM: To determine the ability of critical flicker frequency (CFF) alone or in combination with laboratory findings, as an initial test to pre-select which patients should undergo further testing for the diagnosis of covert hepatic encephalopathy. METHODS: This single-centre study included all patients with cirrhosis who underwent PSE and CFF in 2011. CHE was defined by abnormal PSE test. Logistic regression analysis was performed to identify predictors of CHE. ROC curves were used to identify cut-offs of these independent predictors. RESULTS: One hundred and seventeen patients were included. Seventy (60%) had CHE with a higher MELD [16 (IQR 13-21); P = 0.001] and lower CFF [38 Hz (IQR 36-41) P = 0.0011]. On multivariate analyses, CFF [OR 0.83 (95% CI 0.74-0.94)] and MELD [OR 1.13 (95% CI 1.04-1.22)] were identified as independent predictors of CHE. Sensitivity and specificity of a CFF cut-off of 43 Hz was 93.5% and 42.9%, and for a MELD cut-off of 24, it was 97.5% and 32.8% respectively. Most patients with a MELD-Score <24 and a CFF >43 Hz did not have CHE (78%) and with a MELD-Score >24 and CFF <43 Hz most patients had CHE (85%). Therefore, 27% of patients could avoid further testing with a diagnostic accuracy of 81%. CONCLUSION: The combination of MELD-score and critical flicker frequency may be used as a first diagnostic step to filter patients, in whom further covert hepatic encephalopathy testing could be avoided.

Use of transient elastography (FibroScan®) for the noninvasive assessment of portal hypertension in HIV/HCV-coinfected patients.

The hepatic venous pressure gradient (HVPG) is the gold standard for assessing portal pressure and correlates with the occurrence of portal hypertension (PH)-related complications. Transient elastography (TE) is a new, highly accurate noninvasive technique, which enables us to evaluate hepatic fibrosis to detect advanced fibrosis and cirrhosis. We performed a hepatic haemodynamic study and TE in 38 HIV/HCV-coinfected patients. The association between HVPG and liver stiffness was assessed by linear regression. The diagnostic value of TE was assessed by receiver operating characteristic (ROC) curves. We considered clinically significant PH as an HVPG ≥ 10 mmHg and severe PH as an HVPG ≥ 12 mmHg. A total of 38 HIV/HCV-coinfected patients were included. Twenty-eight patients (73.7%) had clinically significant PH (HVPG ≥ 10 mmHg), and 23 (60.5%) of these had severe PH (HVPG ≥ 12 mmHg). We found a statistically significant association between liver stiffness (kPa) and HVPG (r(2) = 0.46, P < 0.001, straight line equation HVPG=7.4 + 0.204*TE). The areas under the ROC curves were 0.80 [95% confidence interval (CI), 0.64-0.97] and 0.80 (95% CI, 0.66-0.94) for the prediction of HVPG ≥ 10 and ≥ 12 mmHg, respectively. Our data suggest that TE can predict the presence of clinically significant and severe PH in HIV/HCV-coinfected patients.

Nutraceuticals: do they represent a new era in the management of osteoarthritis? - a narrative review from the lessons taken with five products.

OBJECTIVES: The aim of this first global systematic review on selected nutraceuticals was to synthesize and evaluate scientific relevant data available in the literature. Evidences that can support health, physiological or functional benefit on osteoarthritis (OA) were gathered and the level of evidence relative to each of these ingredients was highlighted. METHODOLOGY: Relevant scientific data (positive or not) regarding OA were searched for five groups of compounds (avocado/soybean unsaponifiables (ASU), n-3 polyunsaturated fatty acids, collagen hydrosylates (CHs), vitamin D, polyphenols) within preclinical (in vitro and in vivo), epidemiological, and clinical studies. The following criteria were evaluated to assess the methodology quality of each study: (1) study question; (2) study population; (3) primary endpoint; (4) study design (randomization, control, blinding, duration of follow up); (5) data analysis and interpretation. A scientific consensus was determined for all studied nutraceuticals to evaluate their efficacy in OA. RESULTS: The studied compounds demonstrated different potencies in preclinical studies. Most of them have demonstrated anti-catabolic and anti-inflammatory effects by various inhibitory activities on different mediators. Vitamin D showed a pro-catabolic effect in vitro and the polyphenol, Genistein, had only anti-inflammatory potency. The evaluation of the clinical data showed that ASU was the only one of the studied ingredients to present a good evidence of efficacy, but the efficient formulation was considered as a drug in some countries. Pycnogenol showed moderate evidence of efficacy, and vitamin D and collagen hydrolysate demonstrated a suggestive evidence of efficacy, whereas curcumin, epigallocatechin-3-gallate (EGCG) and resveratrol had only preclinical evidence of efficacy due to the lack of clinical data. The literature gathered for n-3 PUFA, nobiletin and genistein was insufficient to conclude for their efficacy in OA. CONCLUSION: Additional data are needed for most of the studied nutraceuticals. Studies of good quality are needed to draw solid conclusions regarding their efficacy but nutraceuticals could represent good alternates for OA management. Their use should be driven by any recommendations.

Trastorno por déficit de atención con hiperactividad en adultos dependientes de sustancias / Attention-deficit hyperactivity disorder in adults with substance use disorders

Objetivo. La comorbilidad entre el trastorno por déficit de atención con hiperactividad (TDAH) y el trastorno por uso de sustancias (TUS) se ha convertido en un tema de especial interés por el reciente aumento de publicaciones al respecto, postulándose, entre otras, la hipótesis de la medicación para explicarla. En este estudio se pretende evaluar la relación entre estas entidades nosológicas en pacientes que acudían para tratamiento por TUS. Material y métodos. Estudio transversal, descriptivo y analítico, en 249 pacientes obtenidos por muestreo consecutivo en una Unidad de Conductas Adictivas. Resultados. El 28,9 % de los pacientes presentaba un diagnóstico probable de TDAH. Aunque este diagnóstico no se relacionó con el consumo de cocaína u otros estimulantes, la adicción de la heroína sí predecía un mayor riesgo de TDAH (odds ratio [OR]:1,12-2,15).Conclusiones. La relación del TDAH y el TUS no debe explicarse exclusivamente mediante la hipótesis de la automedicación, sino también por otros factores etiológicos comunes de tipo psicosocial (AU)

Objective. The comorbidity between Attention Deficit and Hyperactivity Disorder(ADHD) and Substance Use Disorder (SUD) has generated a special interest as recent publications suggest and self-medication hypothesis has been postulated to explain it. This research tries to evaluate the relationship between those nosologic entities in patients who assist for SUD’s treatment. Material and methods. Cross-sectional study, with descriptive and analytic aspects. The sample was249 patients obtained by consecutive sampling in an Outpatient SUD’s Unit. Results. The 28.9 % of patients had a probable ADHD. Although ADHD were not related to cocaine’s or other stimulants’ addiction, heroine’s addiction predicted more risk of ADHD (OR: 1.12-2.15).Conclusions. The relationship between ADHD and SUD can’t be explained only by self-medication hypothesis. Other common etiological factors should be considered, as psycho-social ones (AU)

Medida de la hipertensión portal: información pronóstica e implicaciones terapéuticas / No disponible

No disponible

Method for macromolecular colocalization using atomic recombination in dynamic SIMS.

Localizing two or more components of assemblies in biological systems requires both continued development of fluorescence techniques and invention of entirely new techniques. Candidates for the latter include dynamic secondary ion mass spectrometry (D-SIMS). The latest generation of D-SIMS, the Cameca NanoSIMS 50, permits the localization of specific, isotopically labeled molecules and macromolecules in sections of biological material with a resolution in the tens of nanometers and with a sensitivity approaching in principle that of a single protein. Here we use two different systems, crystals of glycine and mixtures of proteins, to show that the formation of recombinant CN secondary ions under Cs bombardment can be exploited to create a new colocalization technique. We show experimentally that the formation of the recombinant (13)C(15)N secondary ion between (13)C- and (15)N-labeled macromolecules is indeed an indicator of the distance between the interacting macromolecules and on their shape. We build up a convolution model of the mixing-recombination process in D-SIMS that allows quantitative interpretations of the distance-dependent formation of the recombinant CN. Our results show that macromolecules can be colocalized if they are within 2 nm of one another. We discuss the potential advantages of this new technique for biological applications.

Adult human spinal cord harbors neural precursor cells that generate neurons and glial cells in vitro.

Adult human and rodent brains contain neural stem and progenitor cells, and the presence of neural stem cells in the adult rodent spinal cord has also been described. Here, using electron microscopy, expression of neural precursor cell markers, and cell culture, we investigated whether neural precursor cells are also present in adult human spinal cord. In well-preserved nonpathological post-mortem human adult spinal cord, nestin, Sox2, GFAP, CD15, Nkx6.1, and PSA-NCAM were found to be expressed heterogeneously by cells located around the central canal. Ultrastructural analysis revealed the existence of immature cells close to the ependymal cells, which display characteristics of type B and C cells found in the adult rodent brain subventricular region, which are considered to be stem and progenitor cells, respectively. Completely dissociated spinal cord cells reproducibly formed Sox2(+) nestin(+) neurospheres containing proliferative precursor cells. On differentiation, these generate glial cells and gamma-aminobutyric acid (GABA)-ergic neurons. These results provide the first evidence for the existence in the adult human spinal cord of neural precursors with the potential to differentiate into neurons and glia. They represent a major interest for endogenous regeneration of spinal cord after trauma and in degenerative diseases.

Bisphenol-A disruption of the endocrine pancreas and blood glucose homeostasis.

The link between endocrine disruptors and altered blood glucose homeostasis has been recently suggested. Epidemiological studies have correlated levels of phthalates, dioxins and persistent organic pollutants with alterations of blood glucose homeostasis in humans. Environmentally relevant doses of the ubiquitous endocrine disruptor bisphenol-A (BPA) have profound effects on mice endocrine pancreas--an essential tissue involved in glucose metabolism. BPA exerts rapid non-genomic effects on insulin releasing beta-cells and glucagon releasing alpha-cells within freshly isolated islets of Langerhans. In vivo, a single BPA injection of 10 microg/kg rapidly increases plasma insulin and concomitantly decreases glycaemia. When mice were treated with BPA 100 microg/kg/day for 4 days, the environmental oestrogen produced an increase in beta-cell insulin content along with a post-prandial hyperinsulinaemia and insulin resistance. The results reviewed here demonstrate that doses well below the current lowest observed adverse effect level considered by the US-EPA, disrupt pancreatic beta-cell function producing insulin resistance in male mice. Therefore, this altered blood glucose homeostasis by BPA exposure may enhance the risk of developing type II diabetes.

Promyelocytic leukemia-nuclear body formation is an early event leading to retinoic acid-induced differentiation of neuroblastoma cells.

Neuroblastoma is one of the most common cancers in children. Neuroblastoma differentiation is linked to the presence of the promyelocytic leukemia (PML) protein. Retinoic acid, a powerful differentiation-inducer in vitro, is a potent agent for the treatment of neuroblastoma. Using two different human neuroblastoma cell lines, SH-SY5Y and LA-N-5, we show here that PML protein leads to the formation of nuclear bodies (PML-NB) after only 1 h of retinoic acid treatment and that this formation is mediated by the extracellular signal-regulated kinase (ERK) pathway. Inhibition of protein kinase C also leads to formation of PML-NB via the ERK pathway. Both sumoylation and phosphorylation of PML in an ERK-dependent pathway are also required for formation of PML-NB. Finally, we show that PML-NB formation in neuroblastoma cells is associated with neurite outgrowth. These results support the proposal that the formation of PML-NB is correlated with the differentiation of neuroblastoma cells.

Prognostic value of hepatic venous pressure gradient for in-hospital mortality of patients with severe acute alcoholic hepatitis.

BACKGROUND: Hepatic venous pressure gradient (HVPG) has prognostic value in complications and survival of patients with liver cirrhosis. However, the relationship between HVPG and the outcome of acute alcoholic hepatitis (AAH), as well as the specific features of portal hypertension syndrome in this setting, have not been defined. AIMS: To evaluate the prognostic value of HVPG and to analyse the degree of portal hypertension and hyperdynamic circulation in patients with severe AAH. METHODS: Early measurements of HVPG were performed in 60 patients with severe AAH, and compared with the haemodynamic findings of 37 and 29 liver transplantation candidates with alcoholic or viral end-stage cirrhosis respectively. RESULTS: Twenty-three patients (38%) died during hospitalization. Portal hypertension and hyperdynamic circulation were more severe in AAH patients. HVPG was greater in non-survivors [26.9 (7.4) vs. 19.4 (5.2) mmHg, P < 0.001]. Only 4/31 (13%) patients with HVPG 22 (P < 0.001). Encephalopathy (OR 9.4; CI 1.4-64.8), Model for End-Stage Liver Disease (MELD) score > 25 (OR 7.4; CI 1.4-39.9) and HVPG > 22 mmHg (OR 6.7; CI 1.1-39.9) were independently associated to in-hospital mortality. CONCLUSIONS: Early measurement of HVPG provides important prognostic information on the short-term outcome of patients with severe AAH. In addition, MELD score also seems to be a strong prognostic factor in these patients.

Increased intrahepatic and circulating levels of endoglin, a TGF-beta1 co-receptor, in patients with chronic hepatitis C virus infection: relationship to histological and serum markers of hepatic fibrosis.

Endoglin, a transforming growth factor (TGF)-beta1 co-receptor, has been associated with renal and cutaneous fibrosis, as overexpression of this protein has been observed in biopsies from patients with glomerulosclerosis and scleroderma, respectively. Our aim was to evaluate whether endoglin may be associated with hepatic fibrosis featuring chronic hepatitis C virus (HCV) infection. Fifty-two anti-HCV+ patients, five anti-HCV- patients and 27 healthy subjects were studied. Western blot and immunohistochemistry were used to quantify the expression levels of endoglin and TGF-beta1 in liver biopsy samples, and serum concentrations of endoglin and hyaluronic acid were determined by enzyme-linked immunosorbent assays (ELISAs). In patients with advanced fibrosis, intrahepatic expression levels of endoglin and TGF-beta1 were significantly higher than those in patients with early fibrosis (mean: 3- and 5.8-fold, respectively) and normal liver (mean: 3.9- and 12-fold, respectively). Interestingly, activated hepatic stellate cells as well as portal and septal myofibroblasts expressed endoglin. Serum levels of endoglin were also significantly higher in patients with advanced fibrosis than in those with early fibrosis (55.5 +/- 1.6 vs 47.5 +/- 0.9 ng/mL, P < 0.001), showing a positive correlation with serum hyaluronic acid concentrations (r = 0.57, P = 0.01). In conclusion, increased intrahepatic endoglin and TGF-beta1 expression is significantly associated with progressive hepatic fibrosis in chronic HCV infection. Circulating endoglin levels are elevated in HCV patients showing a significant correlation with histological and serum markers of hepatic fibrosis. These data suggest an active role for endoglin in the fibrotic process featuring chronic HCV infection.

Relative sensitivity factors of inorganic cations in frozen-hydrated standards in secondary ion MS analysis.

We describe the measurement, at 100 K, of the SIMS relative sensitivity factors (RSFs) of the main physiological cations Na+, K+, Mg2+, and Ca2+ in frozen-hydrated (F-H) ionic solutions. Freezing was performed by either plunge freezing or high-pressure freezing. We also report the measurement of the RSFs in flax fibers, which are a model for ions in the plant cell wall, and in F-H ionic samples, which are a model for ions in the vacuole. RSFs were determined under bombardment with neutral oxygen (FAB) for both the fibers and the F-H samples. We show that referencing to ice-characteristic secondary ions is of little value in determining RSFs and that referencing to K is preferable. The RSFs of Na relative to K and of Ca relative to Mg in F-H samples are similar to their respective values in fiber samples, whereas the RSFs of both Ca and Mg relative to K are lower in fibers than in F-H samples. Our data show that the physical factors important for the determination of the RSFs are not the same in F-H samples and in homogeneous matrixes. Our data show that it is possible to perform a SIMS relative quantification of the cations in frozen-hydrated samples with an accuracy on the order of 15%. Referencing to K permits the quantification of the ionic ratios, even when the absolute concentration of the referencing ion is unknown. This is essential for physiological studies of F-H biological samples.

Memory processes in the response of plants to environmental signals.

Plants are sensitive to stimuli from the environment (e.g., wind, rain, contact, pricking, wounding). They usually respond to such stimuli by metabolic or morphogenetic changes. Sometimes the information corresponding to a stimulus may be "stored" in the plant where it remains inactive until a second stimulus "recalls" this information and finally allows it to take effect. Two experimental systems have proved especially useful in unravelling the main features of these memory-like processes.In the system based on Bidens seedlings, an asymmetrical treatment (e.g., pricking, or gently rubbing one of the seedling cotyledons) causes the cotyledonary buds to grow asymmetrically after release of apical dominance by decapitation of the seedlings. This information may be stored within the seedlings, without taking effect, for at least two weeks; then the information may be recalled by subjecting the seedlings to a second, appropriate, treatment that permits transduction of the signal into the final response (differential growth of the buds). Whilst storage is an irreversible, all-or-nothing process, recall is sensitive to a number of factors, including the intensity of these factors, and can readily be enabled or disabled. In consequence, it is possible to recall the stored message several times successively.In the system based on flax seedlings, stimulation such as manipulation stimulus, drought, wind, cold shock and radiation from a GSM telephone or from a 105 GHz Gunn oscillator, has no apparent effect. If, however, the seedlings are subjected at the same time to transient calcium depletion, numerous epidermal meristems form in their hypocotyls. When the calcium depletion treatment is applied a few days after the mechanical treatment, the time taken for the meristems to appear is increased by a number of days exactly equal to that between the application of the mechanical treatment and the beginning of the calcium depletion treatment. This means that a meristem-production information corresponding to the stimulation treatment has been stored in the plants, without any apparent effect, until the calcium depletion treatment recalls this information to allow it to take effect. Gel electrophoresis has shown that a few protein spots are changed (pI shift, appearance or disappearance of a spot) as a consequence of the application of the treatments that store or recall a meristem-production signal in flax seedlings. A SIMS investigation has revealed that the pI shift of one of these spots is probably due to protein phosphorylation. Modifications of the proteome have also been observed in Arabidopsis seedlings subjected to stimuli such as cold shock or radiation from a GSM telephone.

[Osteoporosis and inflammatory bowel disease]. / Osteoporosis y enfermedad inflamatoria intestinal.

Inflammatory bowel disease is a chronic disease with an unknown ethiology although multiple factors intervene such as individual, genetic and immunologic susceptibility, as well as different environmental factors. Like other multisystemic diseases, its clinical manifestations are diverse and it may affect other organs besides the gastrointestinal tract. In the last few years there is a growing interest for one of these extraintestinal manifestations, osteoporosis and osteopenia that may affect up to 42% of patients and can condition an important increase in morbility. Inactivity, prolonged corticosteroid treatment, nutritional deficiencies and the disease per se have an important role in the development of this complication. This article reviews clinical and ethiological aspects of inflammatory bowel disease associated osteoporosis and offers a strategy for diagnosis and treatment.