Immunology of Transmissible Gastroenteritis as Applied to the Protection of Newborn Pigs

Development of effective immunity (active or passive) to a disease by artificial means depends on scientific knowledge of the causative agent, pathogenesis of the disease, and natural immune response to the disease

Weeds and endangered herbs have unforeseen dispersal helpers in the agri-environment: gastropods and earthworms

Agri-environmental schemes involving organic farming or set-aside management aim at promoting biodiversity and restoring ecosystem functioning in agrarian landscapes. Application of pesticides in these crop fields is strongly regulated facilitating the spread of weeds but also allowing for the establishment of endangered herbs and a variety of animals. Recent studies found gastropods and earthworms to be legitimate dispersers of seeds of wild plants. We assumed that both groups also play a significant role in the spread and establishment of wild plants within crop fields. Therefore, we are conducting a series of experiments in three different study systems on (1) the role of earthworms and gastropods as dispersers of rare herbs and weeds in an organic rye field in Germany, (2) the seed feeding behavior of gastropods of plants sown in fallow ground in Switzerland, and (3) weed dispersal in irrigated rice fields by golden apple snails in the Philippine

Exceedance of critical loads and of critical limits impacts tree nutrition across Europe

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“I Get Knocked Down but I Get up Again”: Integrative Frameworks for Studying the Development of Motivational Resilience in School

Many subareas share a common interest in students’ motivational resilience, defined broadly as patterns of action that allow students to constructively deal with, overcome, recover, and learn from encounters with academic obstacles and failures. However, research in each of these areas often progresses in relative isolation, and studies rarely utilize developmental or social-contextual approaches. As a result, we do not yet have a clear understanding of how to help children and adolescents develop a rich and flexible repertoire of tools to deal productively with everyday academic challenges and difficulties. In this article, we knit together these disparate areas of work to create an integrated developmental and social-contextual framework that can guide the future study of these processes. First, we summarize nine areas of work that focus on students’ actions on the ground when they encounter academic difficulties: academic resilience, mastery versus helplessness, engagement and re-engagement, academic coping, self-regulated learning, adaptive help seeking, emotion regulation, and buoyancy as well as tenacity, perseverance, and productive persistence. In each area, we highlight work that is explicitly developmental and that depicts key social-contextual factors that shape motivational resilience. Second, we sketch an overarching social-contextual and developmental framework that holds a place for each of these processes. Third, we identify multiple areas where cross-fertilization among researchers can contribute to improved educational practice and study of the development of motivational resilience. An overarching goal of this article (and the special section more generally) is to take first steps toward “field building” on this crucial topic

The economics of fertility: a new era

In this survey, we argue that the economic analysis of fertility has entered a new era. First-generation models of fertility choice were designed to account for two empirical regularities that, in the past, held both across countries and across families in a given country: a negative relationship between income and fertility, and another negative relationship between women's labor force participation and fertility. The economics of fertility has entered a new era because these stylized facts no longer universally hold. In high-income countries, the income-fertility relationship has flattened and in some cases reversed, and the cross-country relationship between women's labor force participation and fertility is now positive. We summarize these new facts and describe new models that are designed to address them. The common theme of these new theories is that they view factors that determine the compatibility of women's career and family goals as key drivers of fertility. We highlight four factors that facilitate combining a career with a family: family policy, cooperative fathers, favorable social norms, and flexible labor markets. We also review other recent developments in the literature, and we point out promising new directions for future research on the economics of fertility

Involvement of the olfactory bulb in consolidation processes associated with long-term memory in rats.

International audienceIn a daily training paradigm, rats were trained to discriminate between spatially distinct electrical stimulations delivered to one olfactory bulb. Xylocaine injections were used to disrupt the olfactory bulb functioning in the region close to the electrode tips for 1 hr after training session. The treatment started either just after the session or 2 hr later. When compared with the performance of saline-injected rats, the performance of Xylocaine-injected rats was unimpaired except when the treatment started just after the daily session. In that case, acquisition of the task was slightly altered, and retention over a 5-day period was dramatically impaired. We therefore concluded that, within about 1 hr following training, the olfactory bulb is engaged in consolidation processes critical for long-term retention of learned olfactory cues

Weeds and endangered herbs have unforeseen dispersal helpers in the agri-environment: gastropods and earthworms

Agri-environmental schemes involving organic farming or set-aside management aim at promoting biodiversity and restoring ecosystem functioning in agrarian landscapes. Application of pesticides in these crop fields is strongly regulated facilitating the spread of weeds but also allowing for the establishment of endangered herbs and a variety of animals.Recent studies found gastropods and earthworms to be legitimate dispersers of seeds of wild plants. We assumed that both groups also playa significant role in the spread and establishment of wild plants within crop fields. Therefore, we are conducting a series of experiments in three different study systems on (1) the role of earthworms and gastropods as dispersers of rare herbs and weeds in an organic rye field in Germany, (2) the seed feeding behavior of gastropods of plants sown in fallow ground in Switzerland, and (3) weed dispersal in irrigated rice fields by golden apple snails in the Philippines