Mechanical Resistance in Decapod Claw Denticles: Contribution of Structure and Composition

The decapod crustacean exoskeleton is a multi-layered structure composed of chitin-protein fibers embedded with calcium salts. Decapod claws display tooth-like denticles, which come into direct contact with predators and prey. They are subjected to more regular and intense mechanical stress than other parts of the exoskeleton and therefore must be especially resistant to wear and abrasion. Here, we characterized denticle properties in five decapod species. Dactyls from three brachyuran crabs (Cancer borealis, Callinectes sapidus, and Chionoecetes opilio) and two anomuran crabs (Paralomis birsteini and Paralithodes camtschaticus) were sectioned normal to the contact surface of the denticle, revealing the interior of the denticle and the bulk endocuticle in which it is embedded. Microhardness, micro- and ultrastructure, and elemental composition were assessed along a transect running the width of the cuticle using microindentation hardness testing, optical and electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS), respectively. In all species tested, hardness was dramatically higher—up to ten times—in the denticle than in the bulk endocuticle. Likewise, in all species there was an increase in packing density of mineralized chitin-protein fibers, a decrease in width of the pore canals that run through the cuticle, and a decrease in phosphorous content from endocuticle to denticle. The changes in hardness across the cuticle, and the relationship between hardness, calcium, and magnesium content, however, varied among species. Although mechanical resistance of the denticles was exceptionally high in all species, the basis for resistance appears to differ among species

Child development center-based sentinel surveillance of soil-transmitted helminthiases in preschool-age children in selected local government units in the Philippines

Soil-transmitted helminthiasis (STH) remains a public health concern in developing countries, such as the Philippines. Preschool-age children (PSAC) are among the high-risk groups for STH. Data on the status of STH in PSAC are needed to help guide policy formulation and program implementation; however, in the usual setting, such data may remain limited. This study aimed to describe the parasitologic status of PSAC in selected local government units (LGUs) in the Philippines through sentinel surveillance methodology in a child-development center (CDC)-based setting. This cross-sectional study, which included 1732 PSAC in selected barangays (a village or the smallest administrative unit in the country) in the provinces of Cavite, Guimaras, Iloilo, Negros Occidental, and Davao del Norte and cities of Iloilo and Lapu-Lapu in the Philippines, utilized Kato-Katz technique to determine parasitologic status. A single Kato-Katz smear was prepared from the adult-thumb sized stool sample submitted by each participant. Ten percent of Kato-Katz slides examined by field microscopists were re-examined by a reference microscopist as part of quality control. Results showed a prevalence of any STH infection and a moderate-heavy ((M−H)) intensity prevalence of 24.9% and 10.3%, respectively. Five cases of schistosomiasis were found in Lapu-Lapu City and Davao del Norte. While the Philippines’ Department of Health (DOH) - Integrated Helminth Control Program (IHCP) target for prevalence of any STH of less than 50% was attained, none of the barangays or villages met the World Health Organization (WHO) target for (M−H) intensity STH prevalence of less than 1%, despite the program being implemented for almost a decade. Sentinel surveillance in PSAC, possibly adopting a CDC-based approach, may be implemented biannually in the Philippines and other countries where a similar early child care development system exist to generate data needed to guide policy formulation and program implementation. Preventive chemotherapy through facility-based mass drug administration (MDA), such as CDC-based MDA, may be explored to improve the mode of MDA delivery and coverage in PSAC

Corporate philanthropy and community involvement. Analysing companies from France, Germany, the Netherlands and Spain

[EN] This paper analyses the philanthropic behaviour of companies listed on four stock markets: the IBEX 35 (Spain), CAC-40 (France), DAX-30 (Germany) and AEX-25 (Netherlands). A bibliometric method was used to obtain keywords related to corporate philanthropy in literature, while a qualitative content analysis was undertaken to obtain specific philanthropy-related words from company annual reports. 19 groups of words (codes) were defined, indicating the terms used by companies to express corporate philanthropy and community involvement, the forms they use to express such involvement, and the formulas chosen to channel their aid. The word analysis also gave information about the stakeholders that companies take into account when they become involved in community issues. Different hypotheses were stated to determine whether the use of words was related to country, firm size (revenues and employees) or industry. 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Signal transduction in podocytes—spotlight on receptor tyrosine kinases

The mammalian kidney filtration barrier is a complex multicellular, multicomponent structure that maintains homeostasis by regulating electrolytes, acid–base balance, and blood pressure (via maintenance of salt and water balance). To perform these multiple functions, podocytes—an important component of the filtration apparatus—must process a series of intercellular signals. Integrating these signals with diverse cellular responses enables a coordinated response to various conditions. Although mature podocytes are terminally differentiated and cannot proliferate, they are able to respond to growth factors. It is possible that the initial response of podocytes to growth factors is beneficial and protective, and might include the induction of hypertrophic cell growth. However, extended and/or uncontrolled growth factor signalling might be maladaptive and could result in the induction of apoptosis and podocyte loss. Growth factors signal via the activation of receptor tyrosine kinases (RTKs) on their target cells and around a quarter of the 58 RTK family members that are encoded in the human genome have been identified in podocytes. Pharmacological inhibitors of many RTKs exist and are currently used in experimental and clinical cancer therapy. The identification of pathological RTK-mediated signal transduction pathways in podocytes could provide a starting point for the development of novel therapies for glomerular disorders