[Analysis of ageism during the pandemic, a global elder abuse]. / Análisis del edadismo durante la pandemia, un maltrato global hacia las personas mayores.

Ageism is a form of abuse which has negative influence on elderly people. Although COVID-19 affects people of all ages, it has increased ageism effects, reducing the access of the elderly to different resources, including health system. Ageism is associated to cost overruns, poorer health and early mortality. From «GdT atención al mayor de semFYC¼ we make a series of proposals to decrease it based on community activities that favour intergenerational relationships and ageing education allowing a correct integration of the elderly on society.

Metabolism of polysaccharides in dynamic middle lamellae during cotton fibre development.

MAIN CONCLUSION: Evidence is presented that cotton fibre adhesion and middle lamella formation are preceded by cutin dilution and accompanied by rhamnogalacturonan-I metabolism. Cotton fibres are single cell structures that early in development adhere to one another via the cotton fibre middle lamella (CFML) to form a tissue-like structure. The CFML is disassembled around the time of initial secondary wall deposition, leading to fibre detachment. Observations of CFML in the light microscope have suggested that the development of the middle lamella is accompanied by substantial cell-wall metabolism, but it has remained an open question as to which processes mediate adherence and which lead to detachment. The mechanism of adherence and detachment were investigated here using glyco-microarrays probed with monoclonal antibodies, transcript profiling, and observations of fibre auto-digestion. The results suggest that adherence is brought about by cutin dilution, while the presence of relevant enzyme activities and the dynamics of rhamnogalacturonan-I side-chain accumulation and disappearance suggest that both attachment and detachment are accompanied by rhamnogalacturonan-I metabolism.

[Making balances between the risks and benefits of pharmacological treatment in dementia, chronic pain and anticoagulation in elderly persons]. / Haciendo equilibrios entre los riesgos y beneficios del tratamiento farmacológico en demencia, dolor crónico y anticoagulación en personas mayores.

In dementia, specific drugs and psychotropic drugs used for psychotic and behavioral symptoms have limited efficacy. Adverse effects may be important given the age and comorbidity of the patients. It is necessary, frequently, its withdrawal, planned together with the family, monitoring the response and offering non-pharmacological treatment alternatives. Chronic pain is suffered by 25-76% of the elderly who live in a community and is more frequent in women. The treatment is multidisciplinary, establishing realistic objectives, individualizing it, starting with lower doses of drugs and continuously reevaluating to control side effects and to get the correct level of analgesia. The prevalence of atrial fibrillation increases with age and is underdiagnosed. ACO is recommended with dicoumarin or direct oral anticoagulants not antagonists of vitamin K, in patients with AF older than 65 years unless contraindicated, to reduce embolic risk, confirming subgroup analyzes similar efficacy in prevention of stroke.

Developmental features of cotton fibre middle lamellae in relation to cell adhesion and cell detachment in cultivars with distinct fibre qualities.

BACKGROUND: Cotton fibre quality traits such as fibre length, strength, and degree of maturation are determined by genotype and environment during the sequential phases of cotton fibre development (cell elongation, transition to secondary cell wall construction and cellulose deposition). The cotton fibre middle lamella (CFML) is crucial for both cell adhesion and detachment processes occurring during fibre development. To explore the relationship between fibre quality and the pace at which cotton fibres develop, a structural and compositional analysis of the CFML was carried out in several cultivars with different fibre properties belonging to four commercial species: Gossypium hirsutum, G. barbadense, G. herbaceum and G. arboreum. RESULTS: Cotton fibre cell adhesion, through the cotton fibre middle lamella (CFML), is a developmentally regulated process determined by genotype. The CFML is composed of de-esterified homogalacturonan, xyloglucan and arabinan in all four fibre-producing cotton species: G. hirsutum, G. barbadense, G. herbaceum and G. arboreum. Conspicuous paired cell wall bulges are a feature of the CFML of two G. hirsutum cultivars from the onset of fibre cell wall detachment to the start of secondary cell wall deposition. Xyloglucan is abundant in the cell wall bulges and in later stages pectic arabinan is absent from these regions. CONCLUSIONS: The CFML of cotton fibres is re-structured during the transition phase. Paired cell wall bulges, rich in xyloglucan, are significantly more evident in the G. hirsutum cultivars than in other cotton species.

Heteromannan and Heteroxylan Cell Wall Polysaccharides Display Different Dynamics During the Elongation and Secondary Cell Wall Deposition Phases of Cotton Fiber Cell Development.

The roles of non-cellulosic polysaccharides in cotton fiber development are poorly understood. Combining glycan microarrays and in situ analyses with monoclonal antibodies, polysaccharide linkage analyses and transcript profiling, the occurrence of heteromannan and heteroxylan polysaccharides and related genes in developing and mature cotton (Gossypium spp.) fibers has been determined. Comparative analyses on cotton fibers at selected days post-anthesis indicate different temporal and spatial regulation of heteromannan and heteroxylan during fiber development. The LM21 heteromannan epitope was more abundant during the fiber elongation phase and localized mainly in the primary cell wall. In contrast, the AX1 heteroxylan epitope occurred at the transition phase and during secondary cell wall deposition, and localized in both the primary and the secondary cell walls of the cotton fiber. These developmental dynamics were supported by transcript profiling of biosynthetic genes. Whereas our data suggest a role for heteromannan in fiber elongation, heteroxylan is likely to be involved in the regulation of cellulose deposition of secondary cell walls. In addition, the relative abundance of these epitopes during fiber development varied between cotton lines with contrasting fiber characteristics from four species (G. hirsutum, G. barbadense, G. arboreum and G. herbaceum), suggesting that these non-cellulosic polysaccharides may be involved in determining final fiber quality and suitability for industrial processing.

[Depression and burden in the caretaking of elderly]. / Depresión y sobrecarga en el cuidado de personas mayores.

OBJECTIVE: Informal care affects the quality of life and emotional health. Objective: To analyze the relationship between burden and depression in caregivers measured by Zarit's Scale and GHQ-28 and the global functional deterioration of the elderly measured by OARS-MFAQ. METHODS: Descriptive observational cross-sectional study in Primary Health Care at Ourense city. 104 people (>65 years old) and their caregivers were interviewed. Descriptive analysis and logistic regression were used to analyze the characteristics that increase the probability to suffer burden and depression. RESULTS: 82.7% of caregivers were women with an average age of 63.64 years (95% CI: 61.05-66.23) and 10.3% were over 80 years old. 32.2% had an overload, associated with taking care of younger people (p=0.043), being a couple of an elder (p=0.003) being older (p=0.031) and the risk of depression which were all found as factors associated with burden, measured by GHQ (p<0.001). Having good perception of the vision (p=0.038), rejecting the use of a cane (p=0.002) or wheelchair (p=0.015) were also associated with factors contributing to burden. CONCLUSIONS: Informal caregivers are women around their sixties, and although they do not feel overburdened for caring, they have depression, more likely the more severe the burden is, and it is related with the perception of economic deficiencies for the caring.

OBJETIVO: Los cuidados informales afectan a la calidad de vida y a la salud emocional. El objetivo de este trabajo fue analizar la relación entre la carga y la depresión en los cuidadores/as medida con Escala de Zarit y GHQ-28 y el deterioro funcional global del anciano medido mediante OARS-MFAQ. METODOS: Estudio transversal descriptivo por entrevistas a 104 personas mayores de 65 años y sus cuidadores/as informales en la ciudad de Ourense. Se realizó un análisis descriptivo y una regresión logística de las variables que influyen en la depresión y la sobrecarga por cuidar ancianos. RESULTADOS: El 82,7% de cuidadores/as eran mujeres con edad media de 63,64 años (IC 95%: 61,05-66,23) y el 10,3% mayor de 80 años. El 32,2% presentaba sobrecarga encontrándose como factores asociados a la misma, cuidar de ancianos más jóvenes (p=0,043), ser pareja del anciano (p=0,003), tener mayor edad (p=0,031) y el riesgo de depresión medida con GHQ (p<0,001). Tener buena percepción de la visión (p=0,038), rechazar el uso de bastón (p=0,002) o silla de ruedas (p=0,015) también se asoció con la sobrecarga. CONCLUSIONES: Las cuidadoras informales son mujeres en torno a 60 años. Aunque no sientan sobrecarga por cuidar, tienen depresión, que es más probable cuanto más severa es la carga y esta se relaciona con la percepción de carencias económicas básicas para el cuidado.

Interactions between callose and cellulose revealed through the analysis of biopolymer mixtures.

The properties of (1,3)-ß-glucans (i.e., callose) remain largely unknown despite their importance in plant development and defence. Here we use mixtures of (1,3)-ß-glucan and cellulose, in ionic liquid solution and hydrogels, as proxies to understand the physico-mechanical properties of callose. We show that after callose addition the stiffness of cellulose hydrogels is reduced at a greater extent than predicted from the ideal mixing rule (i.e., the weighted average of the individual components' properties). In contrast, yield behaviour after the elastic limit is more ductile in cellulose-callose hydrogels compared with sudden failure in 100% cellulose hydrogels. The viscoelastic behaviour and the diffusion of the ions in mixed ionic liquid solutions strongly indicate interactions between the polymers. Fourier-transform infrared analysis suggests that these interactions impact cellulose organisation in hydrogels and cell walls. We conclude that polymer interactions alter the properties of callose-cellulose mixtures beyond what it is expected by ideal mixing.

Recognition of xyloglucan by the crystalline cellulose-binding site of a family 3a carbohydrate-binding module.

Type A non-catalytic carbohydrate-binding modules (CBMs), exemplified by CtCBM3acipA, are widely believed to specifically target crystalline cellulose through entropic forces. Here we have tested the hypothesis that type A CBMs can also bind to xyloglucan (XG), a soluble ß-1,4-glucan containing α-1,6-xylose side chains. CtCBM3acipA bound to xyloglucan in cell walls and arrayed on solid surfaces. Xyloglucan and cellulose were shown to bind to the same planar surface on CBM3acipA. A range of type A CBMs from different families were shown to bind to xyloglucan in solution with ligand binding driven by enthalpic changes. The nature of CBM-polysaccharide interactions is discussed.

Compound stress response in stomatal closure: a mathematical model of ABA and ethylene interaction in guard cells.

BACKGROUND: Stomata are tiny pores in plant leaves that regulate gas and water exchange between the plant and its environment. Abscisic acid and ethylene are two well-known elicitors of stomatal closure when acting independently. However, when stomata are presented with a combination of both signals, they fail to close. RESULTS: Toshed light on this unexplained behaviour, we have collected time course measurements of stomatal aperture and hydrogen peroxide production in Arabidopsis thaliana guard cells treated with abscisic acid, ethylene, and a combination of both. Our experiments show that stomatal closure is linked to sustained high levels of hydrogen peroxide in guard cells. When treated with a combined dose of abscisic acid and ethylene, guard cells exhibit increased antioxidant activity that reduces hydrogen peroxide levels and precludes closure. We construct a simplified model of stomatal closure derived from known biochemical pathways that captures the experimentally observed behaviour. CONCLUSIONS: Our experiments and modelling results suggest a distinct role for two antioxidant mechanisms during stomatal closure: a slower, delayed response activated by a single stimulus (abscisic acid 'or' ethylene) and another more rapid 'and' mechanism that is only activated when both stimuli are present. Our model indicates that the presence of this rapid 'and' mechanism in the antioxidant response is key to explain the lack of closure under a combined stimulus.