This paper emphasizes the crucial role of variation, at several different levels, for a detailed historical understanding of the development of the biomedical sciences. Going beyond valuable recent studies that focus on model organisms, experimental systems and instruments, we argue that all of these categories can be accommodated within our approach, which pays special attention to organismal and cultural variation. Our empirical examples are drawn in particular from recent historical studies of nineteenth- and early twentieth-century genetics and physiology. Based on (...) the quasi-paradoxical conclusion that biological and cultural variation both constrains and enables innovation in the biomedical sciences, we argue that more attention should be paid to variation as an analytical category in the historiography of the life sciences. (shrink)

The connection between similarity logic and the theory of closure operators is examined. Indeed one proves that the consequence relation defined in [14] can be obtained by composing two closure operators and that the resulting operator is still a closure operator. Also, we extend any similarity into a similarity which is compatible with the logical equivalence, and we prove that this gives the same consequence relation.

How did the events of the early modern period affect the way gender and the self were represented? This collection of essays attempts to respond to this question by analysing a wide spectrum of cultural concerns - humanism, technology, science, law, anatomy, literacy, domesticity, colonialism, erotic practices, and the theatre - in order to delineate the history of subjectivity and its relationship with the postmodern fragmented subject. The scope of this analysis expands the terrain explored by feminist theory, while its (...) feminist focus reveals that the subject is always gendered - although the terms in which gender is conceived and represented change across history. Feminist Readings of Early Modern Culture not only explores the representation of gendered subjects, but in its commitment to balancing the productive tensions of methodological diversity, also speaks to contemporary challenges facing feminism. (shrink)

Current discussions on the utilization of information technologies for agriculture, place emphasis on the collection and processing of information on the farm, through the introduction and use of computers as management support in process control and database management. However, because of farm management's dependency on outside information support for the production control and market engagement, the communication of information and the improvement of its efficiency is of similar, if not greater, importance. This article, therefore, places its main focus on the (...) communication aspect. It provides a classification for “on-farm” communication patterns and highlights, using this classification, a number of European experiences with videotex applications in agriculture. It argues that new information technologies may open the way for new approaches to farm-related communication, and thus for a major change in farm management practices. For this progression to occur, its development and application should base itself upon the basic communication patterns that have evolved in practice, and reflect the actual use of information in agriculture. (shrink)

This study draws on achievement goal theory and self-determination theory to examine the associations among two motivational climates (i.e. mastery and performance) and two indicators of energy at work (i.e. vigour and emotional exhaustion), as well as the mediating role of basic psychological need satisfaction (i.e. autonomy, relatedness, and competence). A two-wave longitudinal study was conducted collecting data from 1081 engineers and technologists. We applied previously validated instruments to assess the variables of interest. Structural equation modeling analyses were conducted to (...) test the hypotheses. Our findings show that mastery climate is positively and significantly related to each of the three basic needs, while a performance climate is negatively and significantly related to each of the three basic needs. Further, the results indicate that the basic needs are significantly associated with both measures of energy, negatively with emotional exhaustion and positively with vigour. This pattern of results suggests that basic psychological need satisfaction mediates the relationship between motivational climates and energy at work. (shrink)

Overzicht van de rationalistische traditie in de filosofie van de kunst sinds Kant door een hoogleraar aan de Leuvense universiteit.

Sustained attention, a key cognitive skill that improves during childhood and adolescence, tends to be worse in some emotional and behavioural disorders. Sustained attention is typically studied in non-affective task contexts; here, we used a novel task to index performance in affective versus neutral contexts across adolescence (N = 465; ages 11–18). We asked whether: (i) performance would be worse in negative versus neutral task contexts; (ii) performance would improve with age; (iii) affective interference would be greater in younger adolescents; (...) (iv) adolescents at risk for depression and higher in anxiety would show overall worse performance; and (v) would show differential performance in negative contexts. Results indicated that participants performed more poorly in negative contexts and showed age-related performance improvements. Those at risk of depression performed more poorly than those at lower risk. However, there was no difference between groups as a result of affective context. For anxiety there was no difference in performance as a function of severity. However, those with higher anxiety showed less variance in their reaction times to negative stimuli than those with lower anxiety. One interpretation is that moderate levels of emotional arousal associated with anxiety make individuals less susceptible to the distracting effects of negative stimuli. (shrink)

Sociological system in accordance with modern times.

The twenty‐six‐year‐old patient requested a prophylactic bilateral mastectomy with reconstruction because of an extensive family history of cancer. She reported that she had developed melanoma at twenty‐five; that her mother, sister, aunts, and a cousin all had breast cancer; that a cousin had ovarian cancer at nineteen; and that a brother was treated for esophageal cancer at fifteen. The treating team was skeptical about this history, and they could find no documentation of the patient's reported melanoma. The surgeon wrote the (...) patient's primary care physician, explaining that he had seen the patient and planned to proceed with the bilateral mastectomy and reconstruction. The primary care physician responded that he was unable to substantiate several of the patient's claims; some of his colleagues believed the family history to be fabricated. Trying to make sense of the discrepancies, the genetic counselor called a counselor colleague who had met with this patient. The colleague suggested that the in‐house genetic counselor “google” the patient. The search revealed two Facebook pages linked to the patient. In one, apparently a personal profile, the patient stated that in addition to battling stage four melanoma, she had recently been diagnosed with breast cancer. She provided a link to a site where she solicited donations to attend a summit for young cancer patients. The other Facebook page featured numerous pictures of her with a bald head, as though she has been through chemotherapy. The genetic counselor showed the Facebook pages to the surgeon, who then decided not to operate. Should health care professionals “google” their patients? (shrink)

L.S. Vygotskii was an outstanding generator of problems. This is what makes his texts more than vestigial curiosities.