scholarly journals The differentiation ofStreptococcus cremorisandStreptococcus lactisby means of bacteriophage action

1946 ◽  
Vol 44 (4) ◽  
pp. 264-270 ◽  
Author(s):  
G. J. E. Hunter

1. A series of lactic streptococci which were almost all capable of clotting milk in 24 hr. at 22°C. were divided into two groups on the basis of a few simple biochemical and morphological tests. The two groups corresponded to what some workers consider to be the speciesStr.lactisandStr.cremoris.2. A series of phage races were tested for their action on the streptococci under various temperature and growth conditions.3. The characteristics of phage attack on the organisms tended to confirm the division intoStr.lactisandStr.cremorisspecies. Each of the strains of the long-chainedcremoristype was attacked by only a few phages at the most, sometimes by a single phage only, whereas each of thelactis(short-chained) strains was attacked by a variety of phages. Furthermore, with two exceptions, the phage attacking thecremoristypes on the one hand and thelactistypes on the other formed quite separate and distinct groups.4. None of the phages acted upon the several available strains ofStr.faecalisand other group D (Lancefield) streptococci.5. The evidence obtained from the phage sensitivity tests seems to justify the division of the lactic streptococci into two species,Str. lactisandStr. cremoris.The author is indebted to Dr H. R. Whitehead for his interest in this work, and for helpful criticism and advice.

1967 ◽  
Vol 71 (677) ◽  
pp. 342-343
Author(s):  
F. H. East

The Aviation Group of the Ministry of Technology (formerly the Ministry of Aviation) is responsible for spending a large part of the country's defence budget, both in research and development on the one hand and production or procurement on the other. In addition, it has responsibilities in many non-defence fields, mainly, but not exclusively, in aerospace.Few developments have been carried out entirely within the Ministry's own Establishments; almost all have required continuous co-operation between the Ministry and Industry. In the past the methods of management and collaboration and the relative responsibilities of the Ministry and Industry have varied with time, with the type of equipment to be developed, with the size of the development project and so on. But over the past ten years there has been a growing awareness of the need to put some system into the complex business of translating a requirement into a specification and a specification into a product within reasonable bounds of time and cost.


2019 ◽  
pp. 289-318
Author(s):  
Lawrence M. Friedman

This chapter discusses the bar, covering its organization, legal education, and the legal literature of the law. The bar was open to almost all men in a technical sense. But class and background did make a difference. Jacksonian ideology should not be taken at face value. The bar was, for one thing, somewhat stratified, even in the nineteenth century. At the beginning of the twenty-first century, there is a tremendous social distance between a Wall Street partner on the one hand, and on the other hand, lawyers who scrambled for a living at the bottom of the heap. Lawyers from wealthy or professional backgrounds were far more likely to reach the heights than lawyers from working-class homes. In 1800 and 1850, there were no large law firms, and hardly any firms at all.


A satisfactory theory of tracheal respiration would not only be of considerable academic interest but, since respiratory poisons are employed for the destruction of many harmful insects, it might prove of great practical value. Physiological studies on the tracheæ of insects have aimed chiefly at establishing, on the one hand, the mode of ending of these air-containing tubes, and, on the other, the forces which maintain the supply of oxygen to their terminations. As regards the former of these problems, there is no general agreement; for most of those who have studied the subject have worked with different organs from different insects, and almost all have assumed that the farthest point to which they have succeeded in tracing the tubes is in fact their termination. In certain cases, however, there is no doubt that the tracheal capillaries or tracheoles penetrate within the cytoplasm of the tissue cells (see Wigglesworth, 1929).


1979 ◽  
Vol 8 ◽  
pp. 163-175 ◽  
Author(s):  
J. E. Cross

After almost a century of discussion of the traditions about the apostles in Cynewulf's poem it is somewhat surprising to find that some simple literary contacts have been ignored. This is true of the latest edition of the poem and of the more recent book,Sources and Analogues of Old English Poetry. In an earlier edition G. P. Krapp had chosen Bede'sMartyrologyas a source forFates, but, since Dom Quentin's detailed work on historical martyrologies has excised the accretions which that martyrology has accumulated, the authentic Bede can now be left out of the discussion. In modern times it seems that two lists of apostles which preface the Hieronymian Martyrology in eighth-century manuscripts are regarded as analogues or contributory sources. These are theNotitia de locis Apostolorum (Notit.), a list of the apostles’ resting-places, in the Echternach manuscript, and theBreviarium Apostolorum (Brev.), in other manuscripts. The two tracts entitledDe Ortu et Obitu Patrumin Migne's Patrologia Latina, the one normally assigned to Isidore of Seville(IO)and the other now regarded as an anonymous Hiberno-Latin tract(HLO)from the eighth century, and both including the apostles, have been considered by previous scholars. All these four works are early enough to have been consulted by Cynewulf, who is thought to have been writing in the ninth century, but none of them individually nor all of them collectively could have provided Cynewulf with all his factual details: none of them reports that James Zebedaei died ‘mid Iudeum’ (35 a) (although this fact could be assumed fromBrev., IOandHLO, which state that he was killed by Herod), that Philip preached in Asia (38a), that Thomas raised Gad, the king's brother, from death and that he himself was killed by a sword (54–60), that Matthew preached in Ethiopia (64) and that a named king ‘Irtacus’ (68a) ordered him to be slain ‘wæpnum’ (69b), that Simon and Thaddeus (or Jude) went together to Persia (76b) and that they died on the same day (‘him wearð bam samod / an endedæg‘, 78b–9a). These details are all lacking inHLO, which has the least differences from Cynewulf's poem. Each of the other texts individually has other differences,Notit. having the greatest number. These abbreviated accounts, of course, merely transmit traditions about the apostles, and so it is clear that Cynewulf used different traditions for at least Philip, Thomas, Matthew and the pair Simon and Thaddeus, who are linked by Cynewulf, whereas in the other texts either they are separated or Thaddeus is not mentioned. It is possible that a curious assumption of ‘short poem, short source’ has prevented scholars from being alert to the significance of a clear clue which has long been available. In Brooks's edition we read that ‘the resurrection of Gad… is not mentioned in Bede'sMartyrology, nor in theBreviarium; hence neither of these can be the sole source of the poem. A full account is given in the Apocryphal Acts of Thomas’, in other words, in the full story of Thomas'sPassio. I hope to demonstrate that almost all the details about the apostles in the poem came immediately from the full stories of theVitaeorPassioneswhich are still extant. In my opinion it is unnecessary to consider the possibility of an abbreviated intermediary, since, as a religious of his period Cynewulf would have heard stories of the saints, including the apostles, on their feast-days, and, as we know, he had access to written accounts for two pieces for such festivals, a story of theInventio Crucisfor his poemEleneand aVita S. Julianaefor his poem under her name. He would have been remarkably inattentive, not to say undevout, if he had not recalled the few details about individual apostles from such hearing or reading.


2020 ◽  
Vol 2020 (46) ◽  
pp. 40-54
Author(s):  
Siegfried Zielinski

In this article, the author examines the contrasting worldviews of specific philosophers, architects, and physicists in an attempt to identify a position that would represent a viable alternative to the concept of universalization. In the history of civilization, he asserts, almost all wars have been of a territorial nature. Territories tend toward uniformity and universalization. He contrasts this worldview with reflections on oceanic thinking, which perceives bodies of water such as the Mediterranean as mediators between continents as well as between opposing worldviews, connecting and dividing at the same time. The sea, however, does not connect in order to homogenize but rather creates distance as an important prerequisite for true communication, thus linking multiplicity in all its variety as a viable alternative to universalism. The author moves on to scrutinize the cosmopolitan attitude as a paradox that on the one hand is oriented to the particular individual and on the other hand to an imaginary world community, that is, the universal. Taking this notion further to consider today’s world that is saturated with the imaginary and symbolic power of the Internet, the author proposes that cosmopolitanism could be understood as an adequate expression for the technologically advanced world community by its capability to strike a balance between the individual and the world as a whole, on one side, and synthetic identity generated by culture and technology, on the other. Nevertheless, deviating from all of these worldviews, the author concludes with a short reflection, inspired by two films, on an alternative to cosmopolitanism that he calls cosmoethics, which employs ethics as the guiding principle of thought and action and commits to a practice that stays in close contact not only with real but also with diverse realities.


1995 ◽  
Vol 25 (2) ◽  
pp. 329-342 ◽  
Author(s):  
Pierre Pominville ◽  
Jean-Claude Ruel

An experiment was conducted to compare the effects of traditional clear-cutting with those of strip cutting on regeneration of black spruce, Piceamariana (Mill.) B.S.P., stands on scarified and unscarified uplands and on lowlands. To that effect, regeneration surveys were done before cutting, in the following year, and 3 and 5 years after cutting. Five years after harvesting, strip cutting led to higher coniferous stocking than clear-cutting on scarified uplands and on lowlands. On unscarified uplands, the gain attributable to strip cutting was not significant. The coniferous stocking of strip cuts on scarified uplands was not greater than on unscarified uplands. So the efficiency of scarification could not be proved in that study. Stocking obtained after 5 years remained closely related to the one observed immediately after harvesting in the strip cufs as in the clear-cuttings. This is particularly true for balsam fir, Abiesbalsamea (L.) Mill. In the strip cuts, the balsam fir stocking was constant while the one of black spruce increased. This could have an impact on the evolution of the composition of the new stands and, consequently, on their vulnerability to spruce budworm, Choristoneurafumiferana (Clem.). The majority of the clear-cuttings were well regenerated 5 years after harvesting. Their average coniferous stocking was slightly above 60%. However, 48% of the clear-cuttings did not reach this level when only unscarified plots on uplands were considered. Advance growth was abundant in those plots but suffered high losses during harvesting. Consequently, reducing the losses during harvesting would result in a lower proportion of clear-cuttings with insufficient coniferous stocking 5 years after cutting. On the other hand, almost all the strip cuts with insufficient regeneration after harvesting were well regenerated 5 years later. Thus, strip cutting could be an interesting option on sites with insufficient advance growth and on sites well regenerated before cutting but where important losses during harvesting are anticipated.


1974 ◽  
Vol 16 (2) ◽  
pp. 305-315 ◽  
Author(s):  
Frank J. O'Neill ◽  
Charles P. Miles

Analysis of centromeric heterochromatin in five human lymphoblastoid cell lines is described utilizing the C banding technique. Two lines, LK 60 and NC 37 showed a polymorphism for the size of the band on chromosome 1. LK 60 also showed accentuation or stretching of the secondary constriction on No. 1 and in almost all cells studied the affected homolog was also the one with the large C band. Another line SKL-1, also showed an accentuated constriction on chromosome 1 but did not have a detectable polymorphism. NC 37 did not show a constriction. In LK 60 the stretching of the constriction always appeared within the boundaries of the constitutive heterochromatin, regardless of the degree of stretching.SKL-1 and RPMI 6410 showed marker chromosomes with double C bands. One such chromosome appeared in SKL-1 and the bands were relatively widely spaced. However, analysis of this chromosome with standard staining procedures showed that one band was only rarely associated with a constriction while the other band, nearest the telomere, always showed a constriction. In RPMI 6410 two such markers were apparent. In one, the bands were well spaced, to allow an analysis for association with constrictions. In this case one band was always associated with a constriction while the other band showed a constriction in most of the cells. The possibility that these chromosomes are dicentric is discussed.


2017 ◽  
Vol 0 (0) ◽  
Author(s):  
Tomasz Sowiński

Abstract In the first part of this study on the capital funded models of pension schemes, the economic concept [in theory] and the Chilean and Argentinian concepts of pensions schemes implemented in those countries were presented. On the one hand, extremely similar to each other, and on the other different with so many detailed solutions that it might as well be said they are completely dissimilar. If we chronologically consider the Chilean system as the primary one, than the Argentinian system is its mirror image, however, reflected in a mirror from the house of mirrors. It is not an uncommon opinion that these are the only countries in which the capital funded model was implemented, but as it was concluded in the first part of the study, almost all of South America became in its own way an unusual testing ground for the implementation of the capital funded concept of pension insurance. Just as the Chilean and Argentinian solutions seem apparently similar to each other, the solutions of the remaining countries in the scope of pension insurance have many variations, specific only to them or to the countries on that continent. To provide a fuller comparison, the tabular summaries will include apart from the two already described countries, the following six countries: Peru, Columbia, Uruguay, Bolivia, Mexico and El Salvador, and also the already described solutions in Chile and Argentina to facilitate a more complete and simple analysis of the presented data. The two best known and continuously analyzed pension insurance systems in South America are, similarly as the Polish and Swedish concepts, though with a definitely different distribution of accents, the Chilean and Argentinian systems. Both are the execution of the so-called capital funded model. Both were implemented in large capitalistic countries located on the same continent. In both countries, the previous pension system were at the verge of efficiency and their economic situation, economies and budgets were also in a state requiring intervention and repair programs. It is worth analyzing even in those cases the differences between the implementation and execution methods and procedures of those pension insurance models that are similar in assumption, and what is very important, the effects or lack of effects in those elements of both implemented models with which they differed.


2020 ◽  
Author(s):  
Chuncheng Liu

Public health scholars classify gay men as “men who have sex with men (MSM)” in their studies and interventions. Debates have been raised about the MSM classification for decades. However, we know little about how people who are classified as MSM perceive and respond to this classification, particularly in the authoritarian context where the biopower interacts with the repressive state power. Drawing upon Ian Hacking's dynamic nominalism theory, this study tries to fill these gaps with interviews of 40 gay men in three Chinese cities about their interactions with public health education materials. I examined their perceptions of MSM knowledge and discourses associated with the classification, as well as their identifications to the MSM subject. I found that, on the one hand, many gay men had internalized the MSM subjectivity and considered themselves essentially at high risk of HIV infection. This compliance was constructed through various biopower techniques with the support of the state's repressive power, as the Chinese state censored almost all public representations of gay men except the HIV/AIDS subject MSM. On the other hand, some of my interviewees were resistant to be part of the MSM classification. I showed how this failure is an unintended consequence of the hegemonic MSM discourse and the authoritarian regime's institutional exclusion of the gay men's community's engagement in the expertise network that develops intervention materials and strategies. At last, I proposed to move beyond the debate around the name and representational character of the MSM by moving toward a more reflexive public health.


2014 ◽  
pp. 129-146 ◽  
Author(s):  
A. Zaostrovtsev

The article analyzes the conception of the history and progress of mankind, presented in recent fundamental research by Deirdre McCloskey. The author stresses the non-materialistic view of institutional change that is characteristic of them. The article examines the controversy with almost all current explanations of the breakthrough of the Western world to the economic growth and prosperity. The paper also presents McCloskey’s own theory that explains this breakthrough by the radical change of rhetoric recognizing the “bourgeois virtues” and the dignity of the bourgeoisie. Attention is drawn to the fact that McCloskey’s views repudiate the predetermined course of history, on the one hand, and its irreversibility, on the other.


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