The long-awaited revision of the industry standard on phylogenetics Since the publication of the first edition of this landmark volume more than twenty-five years ago, phylogenetic systematics has taken its place as the dominant paradigm of systematic biology. It has profoundly influenced the way scientists study evolution, and has seen many theoretical and technical advances as the field has continued to grow. It goes almost without saying that the next twenty-five years of phylogenetic research will prove as fascinating as the (...) first, with many exciting developments yet to come. This new edition of Phylogenetics captures the very essence of this rapidly evolving discipline. Written for the practicing systematist and phylogeneticist, it addresses both the philosophical and technical issues of the field, as well as surveys general practices in taxonomy. Major sections of the book deal with the nature of species and higher taxa, homology and characters, trees and tree graphs, and biogeography—the purpose being to develop biologically relevant species, character, tree, and biogeographic concepts that can be applied fruitfully to phylogenetics. The book then turns its focus to phylogenetic trees, including an in-depth guide to tree-building algorithms. Additional coverage includes: Parsimony and parsimony analysis Parametric phylogenetics including maximum likelihood and Bayesian approaches Phylogenetic classification Critiques of evolutionary taxonomy, phenetics, and transformed cladistics Specimen selection, field collecting, and curating Systematic publication and the rules of nomenclature Providing a thorough synthesis of the field, this important update to Phylogenetics is essential for students and researchers in the areas of evolutionary biology, molecular evolution, genetics and evolutionary genetics, paleontology, physical anthropology, and zoology. (shrink)

We attempt to defend the species-as-individuals hypothesis by examining the logical role played by the binomials (e.g., "Homo sapiens," "Pinus ponderosa") in biological discourse about species. Those who contend that the binomials can be properly understood as functioning in biological theory as singular terms opt for an objectual account of species and view species as individuals. Those who contend that the binomials can in principle be eliminated from biological theory in favor of predicate expressions opt for a predicative account of (...) species and view species as kinds. We contend that biologists' talk about species is talk about species as individuals, and we conclude that the most plausible account of species is an objectual account. (shrink)

Integrating concepts of maintenance and of origins is essential to explaining biological diversity. The unified theory of evolution attempts to find a common theme linking production rules inherent in biological systems, explaining the origin of biological order as a manifestation of the flow of energy and the flow of information on various spatial and temporal scales, with the recognition that natural selection is an evolutionarily relevant process. Biological systems persist in space and time by transfor ming energy from one state (...) to another in a manner that generates structures which allows the system to continue to persist. Two classes of energetic transformations allow this; heat-generating transformations, resulting in a net loss of energy from the system, and conservative transformations, changing unusable energy into states that can be stored and used subsequently. All conservative transformations in biological systems are coupled with heat-generating transformations; hence, inherent biological production, or genealogical proesses, is positively entropic. There is a self-organizing phenomenology common to genealogical phenomena, which imparts an arrow of time to biological systems. Natural selection, which by itself is time-reversible, contributes to the organization of the self-organized genealogical trajectories. The interplay of genealogical (diversity-promoting) and selective (diversity-limiting) processes produces biological order to which the primary contribution is genealogical history. Dynamic changes occuring on times scales shorter than speciation rates are microevolutionary; those occuring on time scales longer than speciation rates are macroevolutionary. Macroevolutionary processes are neither redicible to, nor autonomous from, microevolutionary processes. (shrink)

The origin of insulin‐expressing β‐cells in the adult mammalian pancreas is controversial. During normal tissue turnover and following injury, β‐cells may be replaced by duplication of existing β‐cells.1 However, an alternative source of β‐cells has recently been proposed based on neogenesis from a Ngn3‐positive population present in regenerating pancreatic ducts.2 The appearance of β‐cells from Ngn3‐positive progenitors is reminiscent of normal pancreas development, and Ngn3‐expressing cells isolated from regenerating pancreas can generate the full repertoire of endocrine phenotypes. The isolation and (...) characterisation of the equivalent human progenitors may represent a significant step forward in the hunt for a cure for diabetes. BioEssays 30:617–620, 2008. © 2008 Wiley Periodicals, Inc. (shrink)

The aim of this study was to explore neonatal nurses’and mothers of preterm infants’experiences of daily challenges. Interviews took place asking for good, bad and challenging experiences. Data were analysed using qualitative content analysis and findings were clustered in two categories: good and challenging experiences, each containing three themes. The good experiences were: managing with success as a nurse, small things matter for mothers, and a good day anyhow for mothers and nurses. The challenging experiences were: mothering in public, being (...) pulled between responsibilities, and adverse things stick under the nurses’skin. The study shows that small daily clinical matters become big issues and could lead to moral distress, and that nurses integrate ethics of justice and ethics of care while mothers are concerned about health and well-being of their specific infant only. The challenge for nursing to integrate fairness and sensitive care in family-oriented neonatal care is discussed. (shrink)

Книга предназначена для студентов, преподавателей и научных сотрудников высших учебных заведений, занимающихся вопросами философии.

The vexed question of the exact significance of the name of Mavortius in the old Putean MS. of Prudentius has again been called into court in the recent discussions of the Mavortian recension of Horace, and is fully treated in Dr. Bick's Horazkritik seit 1880, pp. 31–35. As Dr. Bick has done me the honour of subjecting my former articles on the question to his criticism, I feel called upon to say something in defence of the view I maintained. I (...) willingly grant him that perhaps I laid too strong a stress on the connection of the question with Horatian criticism; but I do so, I fear, not as a convert to his arguments in favour of the view that Put. is merely a copy of a MS. that had Mavortius' autograph written in it, and that therefore that name is part of a lost subscriptio, but precisely for the contrary reason, that I consider I was too much influenced by former advocates of that view. That there is no ground for assuming the name to be part of a lost subscriptio I am more than ever convinced, and my object here is to endeavour to show that the whole argument based on a false premise. (shrink)

I venture to call the attention of classical scholars to two legends about Roman Emperors gleaned amid the arid waste of theological nonsense which passed for literature among the Copts, in the hope that they may have better luck than I have had in tracing them to some classical source. The first is taken from MS. Par. Copte 131, fol. 40, a single leaf of what seems to be a geographical and historical encyclopaedia.1 The writer who is treating in a (...) very discursive way of Ethiopia, states that Nero or Domitian—a strange pair to run in double harness—caused an island in the Red Sea to be watered with oil. The description of that island is mixed up with a mention of the original divisions of the Indians—a term which as usual in early days embraces both Indians and Ethiopians,—and their subsequent changes; and as that too may be of interest to students of ancient geography, I will translate the passage in full. (shrink)

I DO not think that it is at all generally known that among the Egyptian antiquities given by Grant Bey to the Museum at Aberdeen there are a considerable number of papyrus fragments, Greek, Coptic,1 Hieratic, Demotic, and even Latin and Arabic, which except for an inspection by Prof. Sayce and a passing visit of Dr. Grenfell have up till now been left unexamined. That indeed is my only reason for trespassing in a branch of Palaeography with which I am (...) quite unfamiliar; and it is in the hope of inciting some experienced papyrologist to turn his attention to them that I publish the following fragments. In the case of the Greek fragments lack of time combined with a mistrust of my powers of deciphering the more illegible non-literary hands forbade me do more than select the most promising literary fragments. Among these Homer naturally predominates; but the gem of the collection is a lyric fragment, which may fairly certainly be ascribed to Alcaeus, though Dr. Grenfell who first noticed it attributed it to Sappho. A fragment of Demosthenes, a fragment of Dioscorides, and a vellum fragment of a Latin Bible, were the only others which I succeeded in identifying; but these, with the few tragic, comic, and medical fragments which I also reproduce, are, I think, first-fruits sufficient to show that the crop would not be barren, if it found a competent gleaner. (shrink)

This research note analyzes the relationship between indicators of corporate social and financial performance within a comprehensive theoretical framework. The results, based on data for 67 large U.S. corporations for 1982-1992, reveal no significant negative social-financial performance relationships and strong positive correlations in both contemporaneous and lead-lag formulations.

One of the central issue of developmental biology concerns the molecular mechanisms whereby a multipotent cell gives rise to distinct differentiated progeny. Differences between specialised cell types reflect variations in their patterns of gene expression. The regulation of transcription initiation is an important control point for gene expression and it is, therefore, not surprising that transcription factors play a pivotal role in mammalian development and differentiation.Haemopoiesis offers a uniquely tractable system for the study of lineage commitment and differentiation. The importance (...) of transcription factor in the normal regulation of haemopoiesis is underlined by the frequency with which transcription factors are targeted by leukaemogenic mutations. Studies of the function and regulation of haemopoietic transcription factors, especially those expressed in lineage‐restricted patterns, should greatly increase our understanding of the molecular control of haemopoiesis. In this review we have focused on insights provided by recent studies of the GATA and SCL proteins. (shrink)