Ausgehend von einer postulierten Abstammung der verschiedenen Gymnospermengruppen und der Angiospermen von Progymnospermen werden die Semophylesen der Samenanlagen und deren „Hüll- und Schutzorganen” eingehend besprochen. Das innere Integument ist phylogenetisch wohl aus verwachsenen sterilen Megasporangien entstanden, das aussere ist das Homologon der Cupula der Samenfarnen und ein Achsengebilde.Die dritte Hülle — die interseminalen Schuppen bei den Bennettiteen, die Chlamys bei den Chlamydospermen, die Fruchtknotenwand bei einigen Angiospermengruppen wie Pandanaceen und Cyperaceen, und der Arillus bei Angiospermen mit karpellaten Gynoezien — ist (...) wahrscheinlich aus reduzierten Samenanlagen hervorgegangen. Die vierte, aus sterilen brakteenartigen Phyllomen entstanden, hat in verschiedenen Kombinationen mit fertilen Achsen, die karpellaten Fruchtknoten der Angiospermen gebildet.Die Herkunft der Blütenpflanzen von chlamydospermen- und bennettiteen-ähnlichen Vorfahren wird sehr wahrscheinlich da Übergänge zwischen den „nackten” Samenanlagen vomGnetum-Typ und sogenannten pseudomonomeren Griffeln von Angiospermen vorliegen.En basant la phylogénie de plusieurs groupes de Gymnospermes et d'Angiospermes sur une descente des Progymnospermes du Devonien Supérieur , les sémophylèses des ovules et de ses couches protectrices ont été discuté.Le tégument interne très probablement représente une groupe de mégasporanges stériles fusés, le tégument externe est l'homologue des cupules des ptéridospermes et d'origine axillaire. La troisième couche — les écailles interséminales chez les Bennettitales, la chlamys chez les Chlamydospermes, le paroi de l'ovaire chez quelques Angiospermes comme les Pandanacées, les Piperacées..., l'arille de l'ovule dans les ovaires carpellaires des Angiospermes — est probablement l'homologue d'un nombre d'ovules steriles. La quatrième couche, constituée de phyllomes steriles, s'est associée avec des axes ovulifères en formant les pistils carpellaires des Angiospermes. L'origine des Angiospermes des ancêtres d'un type Chlamydosperme-Bennettitale est indiqué par la morphologie transitoire de quelques ovaires soi-disant „pseudo-monomères” liant les ovules „nues” du typeGnetum avec les pistils du type des Piperacées, Chloranthacées etc. (shrink)

A critical appraisal of the theories founded on the theorem of the multiaxial flower , shows an evolution fromWettstein's original version of 1907 to various hypotheses founded on the the same theme and partly derived from the Wettsteinian doctrine. A number of circumstances such as semantic inconsistencies, but principally the choice of inadequate archetypes, prevented the success of the theory of a polystachyous floral region, because the deductions and interpretations emanating from this concept were not sufficiently convincing to defeat the (...) opposed theory of the uniaxial euanthous flower or anthostrobilus hypothesis. Only after the amendation of the theory of a multiaxial reproductive region on the basis of the anthocorm concept can one arrive at a plausible idea of the evolution of the angiospermous flower which is compatible with all aspects of the phylogeny of the Flowering Plants , and with the floral morphology and anatomy of the various kinds of flowers.Eine kritische Bewertung der Theorien die auf dem Theorem der mehrachsigen Blüte gegründet worden sind zeigt die Entwicklung von einer vonWettstein in 1907 vorgeschlagenen Originalversion zu mehreren, teilweise davon abgeleiteten, Theorien über das Thema der Entstehung der Angiospermenblüte. Verschiedene Umstände, wie z.B. semantische Widersprüche, aber in erster Stelle die Wahl eines inadäquaten Prototypus, verhinderten anfänglich den Erfolg der Hypothese eines mehrachsigen Blütenbereiches, weil es den hervorgehenden Schlussfolgerungen und Deutungen zu viel an Ueberzeugungskraft mangelte um die gegnerische Theorie der einachsigen Ranalesblüte oder Anthostrobilushypothese endgültig zu verdrängen. Erst die Ergänzung der Theorie einer vielachsigen Blüte ermöglichte die plausibele Darstellung der Evolution der Angiospermenblüte, welche Erörterung in befriedigender Weise in Uebereinstimmung ist mit allenA spekten der Phylogenie der Blütenpflanzen , und auch mit den morphologischen and anatomischen Verhältnissen bei Blüten jeder Art im Anklang ist.Une évaluation critique des différentes théories fondées sur le théorème de la fleur pluriaxiale montre une évolution qui commence avec une version originale proposée parWettstein en 1907 et qui mène à plusieurs théories, partiellement dérivées de l'idée wettsteinienne, sur le thème de l'origine de la fleur. Quelques circonstances, comme par exemple des contrariétés sémantiques, mais surtout la choix d'un prototype inadéquat, ont prévenu au début le triomphe de l'hypothèse d'une région florale pluriaxiale, puisque les conclusions et les interprétations qui provenaient de cette théorie étaient privées de toute conviction pour suppléer la théorie opposée de la fleur ranalienne et uniaxiale . Une explication recevable de l'évolution de la fleur angiospermique qui harmonise avec tous les aspects de la phylogénie des plantes floriales , et aussi avec les conditions morphologiques et anatomiques de toutes sortes de fleurs, ne gagnait de terrain qu'après le perfectionnement de la théorie de la fleur pluriaxiale. (shrink)

The different aspects of floral evolution—Angiosperm descent, floral morphology and pollination ecology—are discussed on the basis of the anthocorm theory of the angiospermous flower. Opposed ideas are critically compared and rejected mainly on account of several inconsistencies and flaws in old floral concepts. Floral evolution passed from a very early phase of dicliny, anemophily and aphananthy of the anthocorm to a phase of incipient entomophily soon associated with a partial sex reversal within the anthocorm. This second phase culminated in the (...) monoclinous and primarily zoophilous flower types, whereas other floral types, more particularly the primarily anemophilous, diclinous flowers, are the direct descendants of the anthocorms of the initial phase. The second phase gave rise to at least two morphologically different flower types and two separate semophyletic lines of floral evolution , in each of which the primary zoophily is almost always associated with the development of intrafloral semaphylls usually of androecial derivation. Early flower types were aphananthous and clearly anthocormoid and assumed the morphology and other characteristics of a true flower by contractions, condensations, readjustments, oligomerisations, reductions and modifications leading to the great variety of adaptive floral patterns.Divers aspects de l'évolution de la fleur — à savoir la descendance des Angiospermes, la morphologie de la fleur, et l'écologie de la pollination — sont discutés à partir de l'hypothèse florale de l'anthocorme. Les opinions opposées, après d'être comparées et critisées, sont rejetées principalement à cause des inconséquences et inconsistances des anciens théorèmes morphologiques concernant l'origine de la fleur. L'évolution de la fleur commençait avec une phase d'antan de diclinie, anémophilie et aphananthie, et s'avançait graduellement dans la direction d'une phase entomophilique initiale, bientôt accompagnée d'un renversement de sexe partiel à l'intérieur de l'anthocorm. La deuxième phase culminait vers les types florals monoclines avec zoophilie primaire pendant que des autres types florals, particulièrement les fleurs diclines avec anémophilie primaire, sont les descendants directs du stade initiale de l'anthocorme. A partir de la phase II , au moins deux types florals différents et aussi deux sémophylèses florals séparés se développaient. Dans chacun de ses phases III et III A la zoophilie primaire est presque toujours accouplée avec l'origine des sémaphylles intrafloraux le plus souvent dérivés des étamines. Les anciens types des fleurs ayant été aphanantique et au début encore nettement anthocormoïdes , graduellement prenaient la forme d'une des plusieurs types floraux adaptifs par une contraction de l'axe florale et par l'entassement, l'oligomérisation et la modification des pièces de la fleur.Die drei Aspekte der Evolution der Blüte — die Abstammungsgeschichte der Angiospermen, Blütenmorphologie und Bestäubungsökologie — werden, ausgehend von der Anthokormtheorie der Angiospermenblüte, eingehend besprochen. Entgegengesetzte Meinungen werden kritisch verglichen und hauptsächlich auf Grund mehrerer Strittigkeiten und Fehler der älteren blütenmorphologischen Axiomen abgelehnt. Die Evolution der Blüte fing an mit einer frühen Phase mit Diklinie, Anemophilie und Aphananthie des Anthokorms und schritt allmählich weiter in die Richtung von beginnender Entomophilie, bald mit einer partiellen Geschlechtsinversion innerhalb des Anthokorms zusammengehend. Diese zweite Phase kulminierte in den monoklinen und primär zoophilen Blütentypen, während andere Blütengestalten, besonders die primär anemophilen und diklinen Angiospermenblüten, die unmittelbaren Abkömmlinge der Initialphase des Anthokorms sind. Aus der zweiten Phase entwickelten sich wenigstens zwei morphologisch differenzierte Blütenformen und auch zwei geschiedene Blütensemophylesen , in jeder die primäre Zoophilie fast immer verbunden ist mit der Entwicklung von intrafloralen und meistens von Staubblättern angeleiteten Semaphyllen . Die frühen Blütentypen waren aphanantisch und anfänglich noch deutlich anthokormoid und nahmen allmählich die entgültige Gestalt von einer der vielen adaptiven Blütentypen an durch eine Verkürzung der Blütenachse, und durch ein Zusammendrängen, Oligomerisation und Abänderung der Blütenteile. (shrink)

Volume 46, Issue 6, November 2020, Page 727-743.

A new criterion is introduced for judging the suitability of various fuzzy logics for practical uncertain reasoning in a probabilistic world and the relationship of this criterion to several established criteria, and its consequences for truth functional belief, are investigated.

Background: The traditional approach to resolving ethics concerns may not address underlying organisational issues involved in the evolution of these concerns. This represents a missed opportunity to improve quality of care “upstream”. The purpose of this study was to understand better which organisational issues may contribute to ethics concerns. Methods: Directed content analysis was used to review ethics consultation notes from an academic children’s hospital from 1996 to 2006 (N = 71). The analysis utilised 18 categories of organisational issues derived (...) and modified from published quality improvement protocols. Results: Organisational issues were identified in 68 of the 71 (96%) ethics consult notes across a range of patient settings and reasons for consultation. Thirteen of the 18 categories of organisational issues were identified and there was a median of two organisational issues per consult note. The most frequently identified organisational issues were informal organisational culture (eg, collective practices and approaches to situations with ethical dimensions that are not guided by policy), policies and procedures (eg, staff knows policy and/or procedural guidelines for an ethical concern but do not follow it) and communication (eg, communication about critical information, orders, or hand-offs repeatedly does not occur among services). Conclusions: Organisational issues contribute to ethical concerns that result in clinical ethics consults. Identifying and addressing organisational issues such as informal culture and communication may help decrease the recurrence of future similar ethics concerns. (shrink)

American football is played in a chaotic visual environment filled with relevant and distracting information. We investigated the hypothesis that collegiate football players show exceptional skill at shielding their response execution from the interfering effects of distraction ( interference control ). The performances of 280 football players from National Collegiate Athletic Association Division I football programs were compared to age-matched controls in a variant of the Eriksen flanker task ( Eriksen and Eriksen, 1974 ). This task quantifies the magnitude of (...) interference produced by visual distraction on split-second response execution. Overall, football athletes and age controls showed similar mean reaction times (RTs) and accuracy rates. However, football athletes were more proficient at shielding their response execution speed from the interfering effects of distraction (i.e., smaller flanker effect costs on RT). Offensive and defensive players showed smaller interference costs compared to controls, but defensive players showed the smallest costs. All defensive positions and one offensive position showed statistically smaller interference effects when compared directly to age controls. These data reveal a clear cognitive advantage among football athletes at executing motor responses in the face of distraction, the existence and magnitude of which vary by position. Individual differences in cognitive control may have important implications for both player selection and development to improve interference control capabilities during play. (shrink)

Issues of resource allocationResource allocation, triageTriage, and rationingRationing decisions are common in the context of disasters and public healthPublic health emergencies, such as pandemics. However, to date, the majorityMajority of the literature focuses on an adult population with very little attention given to a pediatric population or to a population that may be mixed: adults and children. Furthermore, decisions of rationingRationing scarce resources do not only occur during disasters and other wide-scale emergencies. Such decisions are commonplace in pediatric organ transplantation (...) and can creep into areas of experimental medicine, such as xenotransplantation. This chapter explicates differences between pediatric and adult triageTriage decisions by first looking at the trifold issues of resource allocationResource allocation, triageTriage, and rationingRationing decisions mainly in the context of a disaster situation or public healthPublic health emergency. However, the issues of pediatric organ transplantation, health disparitiesHealth disparities, and experimental medicine will also be covered. (shrink)

The complexity of biobank research raises concerns about individuals’ understanding of the information conveyed in the consent process for such research.. We report the results of a qualitative, cognitive interview study with an ethnically, linguistically, and educationally diverse sample of 43 respondents to assess the clarity and utility of a multimedia tool developed for a biobank. Using weighted randomization, respondents were assigned to either view the multimedia tool or read a written consent document . The study illustrates the utility of (...) cognitive interviews for gaining insights from prospective research participants about the clarity of informed consent tools. Findings suggest that a multimedia tool is useful for communicating key messages but should be combined with a written consent document and personal interaction with the study staff. We recommend that the potential value of multimedia tools should be more rigorously tested in a randomized controlled trial. (shrink)

An appropriate kind of curved Hilbert space is developed in such a manner that it admits operators of $\mathcal{C}$ - and $\mathfrak{D}$ -differentiation, which are the analogues of the familiar covariant and D-differentiation available in a manifold. These tools are then employed to shed light on the space-time structure of Quantum Mechanics, from the points of view of the Feynman ‘path integral’ and of canonical quantisation. (The latter contains, as a special case, quantisation in arbitrary curvilinear coordinates when space is (...) flat.) The influence of curvature is emphasised throughout, with an illustration provided by the Aharonov-Bohm effect. (shrink)

Consumer involvement in clinical research is an essential component of a comprehensive response during emergent health challenges. During the COVID-19 pandemic, the moderation of research policies and regulation to facilitate research may raise ethical issues. Meaningful, diverse consumer involvement can help to identify practical approaches to prioritize, design, and conduct rapidly developed clinical research amid current events. Consumer involvement might also elucidate the acceptability of flexible ethics review approaches that aim to protect participants whilst being sensitive to the challenging context (...) in which research is taking place. This article describes the main ethical challenges arising from pandemic research and how involving consumers and the community could enable resolution of such issues. (shrink)