scholarly journals Selective foraging of fungi by collembolans in soil

2005 ◽  
Vol 1 (2) ◽  
pp. 243-246 ◽  
Author(s):  
Helene Bracht Jørgensen ◽  
Tomas Johansson ◽  
Björn Canbäck ◽  
Katarina Hedlund ◽  
Anders Tunlid
Keyword(s):  
Food Choice ◽  
Natural Soil ◽  
Molecular Technique ◽  
Invertebrate Community ◽  
Apparent Contradiction ◽  
Rdna Sequences ◽  
Selective Foraging ◽  
Collembolan Species ◽  
Protaphorura Armata ◽  
Prevailing View

Soils contain highly diverse communities of microorganisms and invertebrates. The trophic interactions between these species are largely unknown. Collembolans form an abundant part of the invertebrate community in soils. A prevailing view is that soil collembolans are generalist feeders on fungi, lichens, fragmented litter and bacteria. However, in laboratory food choice experiments, it has been shown that collembolans preferentially select certain taxa of fungi. To examine this apparent contradiction, we developed a molecular technique based on the analysis of 18S ribosomal DNA (rDNA) sequences to explore the diversity of fungi in soils and in the guts of collembolans. We report that the diversity of fungi found in the natural soil was 33 times higher than that in the guts of the collembolan Protaphorura armata . The data support the view that collembolan species can be highly selective when foraging on fungi in soils.

Polygonal profiles of ferritin molecules

1983 ◽  
Vol 41 ◽  
pp. 600-601
Author(s):  
William H. Massover
Keyword(s):  
Axial Ratio ◽  
X Ray Diffraction ◽  
Rhombic Dodecahedron ◽  
Apparent Contradiction ◽  
Iron Storage ◽  
X Ray ◽  
Hexagonal Shape ◽  
Axes Of Symmetry ◽  
Apparent Conflict ◽  
Iron Storage Protein

The molecular structure of the iron-storage protein, ferritin, is becoming known in ever finer detail. The 24 apoferritin subunits (MW ca. 20,000) have a 2:1 axial ratio and are polymerized with 4:3:2 symmetry to form an outer shell surrounding a variable amount of microcrystalline iron, Recent x-ray diffraction results indicate that the projected outline of the native molecule has a quasi-hexagonal shape when viewed down the 3-fold axes of symmetry, and a quasi-square shape when looking down the 4-fold axes. To date, no electron microscope study has reported observing anything other than circular profiles, which would indicate that ferritin is strictly spherical. The apparent conflict between the "hollow sphere" of electron microscopy (E.M.) and the "truncated rhombic dodecahedron" of x-ray diffraction could reflect the poorer effective resolution of E.M. coming from radiation damage, staining, drying, etc. The present study investigates the detailed shape of individual ferritin molecules in order to search for the predicted aspherical profiles and to interpret the nature of this apparent contradiction.

Food Choice and Delay of Gratification

2009 ◽  
Author(s):  
Jessica Van Exan ◽  
Jennifer S. Mills
Keyword(s):  
Food Choice ◽  
Delay Of Gratification

Remembering the Past in Nineteenth-Century Scotland

2014 ◽  
Author(s):  
James J. Coleman
Keyword(s):  
Nineteenth Century ◽  
National Identity ◽  
19Th Century ◽  
21St Century ◽  
Collective Memories ◽  
The Past ◽  
Prevailing View ◽  
The Way

At a time when the Union between Scotland and England is once again under the spotlight, Remembering the Past in Nineteenth-Century Scotland examines the way in which Scotland’s national heroes were once remembered as champions of both Scottish and British patriotism. Whereas 19th-century Scotland is popularly depicted as a mire of sentimental Jacobitism and kow-towing unionism, this book shows how Scotland’s national heroes were once the embodiment of a consistent, expressive and robust view of Scottish nationality. Whether celebrating the legacy of William Wallace and Robert Bruce, the reformer John Knox, the Covenanters, 19th-century Scots rooted their national heroes in a Presbyterian and unionist view of Scotland’s past. Examined through the prism of commemoration, this book uncovers collective memories of Scotland’s past entirely opposed to 21st-century assumptions of medieval proto-nationalism and Calvinist misery. Detailed studies of 19th-century commemoration of Scotland’s national heroes Uncovers an all but forgotten interpretation of these ‘great Scots’ Shines a new light on the mindset of nineteenth-century Scottish national identity as being comfortably Scottish and British Overturns the prevailing view of Victorian Scottishness as parochial, sentimental tartanry

Cicero's Law

2016 ◽  
Keyword(s):  
Criminal Courts ◽  
Criminal Trials ◽  
Apparent Contradiction ◽  
Legal Realism ◽  
Rhetorical Strategy ◽  
The Way

Why did Roman prosecutors typically accuse the defendant of multiple crimina, when in most standing criminal courts the punishment imposed on a guilty defendant was the same (typically “capital,” that is, a kind of exile), no matter how many charges were proven? The answer lies not in a failure to distinguish between legal charges leveled at the defendant and defamation of his character, but rather in a rhetorical strategy that made sense in light of what was legally necessary to obtain a conviction. The greater the number of charges, the more likely the jurors would be persuaded that the defendant had in some way violated the statute according to which the trial was being conducted. It is true that prosecutors typically argued that the defendant’s prior conduct made it plausible that he had committed the crimes with which he was charged, but in a way that, as much as possible, made his guilt on these particular charges seem likely, and defense patroni attempted to undermine the charges and the character defamation. This answer to the apparent contradiction between multiple charges and unitary punishment favors a moderate formalism over legal realism as the way to interpret Roman criminal trials.

The Lamp, Qasim Amin, Jewish Women and Baghdadi Men: A Reading in the Jewish Iraqi Journal al-Misbah

2018 ◽  
Author(s):  
Orit Bashkin
Keyword(s):  
Jewish Identity ◽  
Democratic Citizenship ◽  
Jewish Women ◽  
Apparent Contradiction ◽  
British Mandate ◽  
Arab Nationalism ◽  
State Institutions

This chapter provides a detailed reading of al-Misbah, a Jewish Iraqi publication which appeared in Baghdad between the years 1924 and 1929 and has been characterised both as a Zionist mouthpiece and a testimony to the success of Arab nationalism. In addressing this apparent contradiction, the chapter examines the issues which dominated its pages in order to highlight the identity of the paper and to enrich our understanding of the Iraqi press under the British Mandate. The chapter addresses two discursive circles – the Iraqi and the Jewish – and proposes that al-Misbah conveyed an unmistakable Iraqi and Arab identity. Despite the editor’s Zionist inclinations, the conversations between readers and writers acquired a life of their own and the paper, in fact, promoted a new Arab Jewish identity and illustrated how Jews sought to use state institutions as venues for the cultivation of non-sectarian and democratic citizenship.

The Hydra of Tyranny, The Fall of Robespierre and the Early Demise of Robert Southey's Revolutionary Enthusiasm

Romanticism ◽  
2019 ◽  
Vol 25 (2) ◽  
pp. 143-156 ◽  
Author(s):  
Jonathan Taylor
Keyword(s):  
Later Life ◽  
Joan Of Arc ◽  
Principled Explanation ◽  
Closet Drama ◽  
Prevailing View

This article explores Robert Southey's pessimistic re-appropriation of the popular revolutionary symbol of the hydra in the closet drama The Fall of Robespierre (1794). Challenging the prevailing view that Southey was an enthusiastic revolutionary throughout the 1790s, the study progresses from an exploration of the hydra's ubiquitous use in revolutionary and loyalist propaganda to an account of Southey's damning re-appropriation of the monster as a symbol for recurrences of tyranny in France's revolutionary governments. Analyses of The Fall of Robespierre, Southey's closet drama Wat Tyler (1794) and epic Joan of Arc (1796) demonstrate that Southey acquired an early conviction that tyranny was a recurrent obstacle to democracy, which rendered revolution futile. Arguing that Southey's revolutionary zeal had largely abated by 1793, I contend that his youthful incredulity about the plausibility of establishing a republic informed, and constitutes a principled explanation for, his notorious apostasy and conservatism in later life.

Transportation and the Environment

2017 ◽  
Vol 94 (3) ◽  
pp. 37-61
Author(s):  
Douglas R. Littlefield
Keyword(s):  
Nineteenth Century ◽  
San Francisco ◽  
Sierra Nevada ◽  
Mississippi River ◽  
San Joaquin Valley ◽  
Eastern United States ◽  
Major Health ◽  
San Joaquin River ◽  
Natural Wetlands ◽  
Prevailing View

Some histories of California describe nineteenth-century efforts to reclaim the extensive swamplands and shallow lakes in the southern part of California's San Joaquin Valley – then the largest natural wetlands habitat west of the Mississippi River – as a herculean venture to tame a boggy wilderness and turn the region into an agricultural paradise. Yet an 1850s proposition for draining those marshes and lakes primarily was a scheme to improve the state's transportation. Swampland reclamation was a secondary goal. Transport around the time of statehood in 1850 was severely lacking in California. Only a handful of steamboats plied a few of the state's larger rivers, and compared to the eastern United States, roads and railroads were nearly non-existent. Few of these modes of transportation reached into the isolated San Joaquin Valley. As a result, in 1857 the California legislature granted an exclusive franchise to the Tulare Canal and Land Company (sometimes known as the Montgomery franchise, after two of the firm's founders). The company's purpose was to connect navigable canals from the southern San Joaquin Valley to the San Joaquin River, which entered from the Sierra Nevada about half way up the valley. That stream, in turn, joined with San Francisco Bay, and thus the canals would open the entire San Joaquin Valley to world-wide commerce. In exchange for building the canals, the Montgomery franchise could collect tolls for twenty years and sell half the drained swamplands (the other half was to be sold by the state). Land sales were contingent upon the Montgomery franchise reclaiming the marshes. Wetlands in the mid-nineteenth century were not viewed as they are today as fragile wildlife habitats but instead as impediments to advancing American ideals and homesteads across the continent. Moreover, marshy areas were seen as major health menaces, with the prevailing view being that swampy regions’ air carried infectious diseases.

Reagan ’s Democratic Revolution

2017 ◽  
Author(s):  
Tony Smith
Keyword(s):  
Soviet Union ◽  
American Foreign Policy ◽  
World Order ◽  
Current Strength ◽  
Apparent Contradiction ◽  
Free Markets ◽  
Liberal Democratic ◽  
The Soviet Union ◽  
Democratic Revolution ◽  
Constructive Engagement

This chapter examines Ronald Reagan's commitment to the tenets of liberal democratic internationalism, and in particular his promotion of a global “democratic revolution” characterized by an apparent contradiction between activism and moderation in American foreign policy. It begins with a discussion of the Reagan administration's strategy that called for a a minimal effort on its part to realize its vision of a world order dominated by democratic governments, with emphasis on three key operational programs: “constructive engagement”; the push for antistatist, free markets abroad; and the Reagan Doctrine. The chapter then considers the role played by the Reagan administration's policies to the collapse of communism in the Soviet Union and the succeeding prestige of democratic governance worldwide. It argues that the American role in the spread of democracy worldwide in the twentieth century was a necessary, but not sufficient, cause for the current strength of democratic government.

Molecular Characterization of Methicillin Resistant and Extended Spectrum β-Lactamase Staphylococcus aureus Isolated from Burn Patients

2020 ◽  
pp. 145-151
Author(s):  
Shawnm Ahmed Aziz
Keyword(s):  
Staphylococcus Aureus ◽  
Methicillin Resistance ◽  
Vancomycin Resistance ◽  
World Health ◽  
Molecular Technique ◽  
Burn Patients ◽  
Beta Lactamase ◽  
Beta Lactam ◽  
Extended Spectrum Beta Lactamase ◽  
Extended Spectrum

Antibiotic resistance has become a major world health challenge and has limited the ability of physician's treatment. Staphylococcus aureus the most notorious pathogens causes morbidity and mortality especially in burn patients. However, Staphylococcus aureus rapidly acquired resistance to multiple antibiotics. Vancomycin, a glycopeptide antibiotic remains a drug of choice for treatment of severe Methicillin Resistance S. aureus infections. This study aimed to detect the emergence of beta-lactam and glycopeptide resistance genes. 50 clinical specimens of S. aureus collected from burn patients in burn and plastic surgery units in Sulaimani-Iraq city. All specimens were confirmed to be positive for S. aureus. All the isolates were assessed for their susceptibility to different antibiotics depending on NCCL standards, followed by Extended Spectrum Beta Lactamase detection by double disk diffusion synergy test. The production of β- lactamases was evaluated in the isolated strains by several routine methods and polymerase chain reaction. Among the isolates 94% were Methicillin resistance and 34.28% were Extended Spectrum Beta Lactamase producer. PCR based molecular technique was done for the bla genes related to β- lactamase enzymes by the specific primers, as well as genes which related to reduced sensitivity to Vancomycin were detected. The results indicated that all isolated showed the PBP1, PBP2, PBP3, PBP4, trfA and trfB, graSR, vraS except the vraR gene and the prolonged therapy of Methicillin resistance infection with teicoplanin have been associated with progress of resistance and the rise of tecoplanin resistance may be a prologue to evolving Vancomycin resistance. In conclusion, beta-lactam over taking can rise Vancomycin- Intermediate S. aureus strains leading to appearance of Vancomycin resistance although the treatment of Vancomycin resistant infections is challenging.

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