Plant-associated microbial assemblages are known to shift at time scales aligned with plant phenology, as influenced by the changes in plant-derived nutrient concentrations and abiotic conditions ...observed over a growing season. But these same factors can change dramatically in a sub-24-hour period, and it is poorly understood how such diel cycling may influence plant-associated microbiomes. Plants respond to the change from day to night via mechanisms collectively referred to as the internal "clock," and clock phenotypes are associated with shifts in rhizosphere exudates and other changes that we hypothesize could affect rhizosphere microbes. The mustard
has wild populations that contain multiple clock phenotypes of either a 21- or a 24-hour cycle. We grew plants of both phenotypes (two genotypes per phenotype) in incubators that simulated natural diel cycling or that maintained constant light and temperature. Under both cycling and constant conditions, the extracted DNA concentration and the composition of rhizosphere microbial assemblages differed between time points, with daytime DNA concentrations often triple what were observed at night and microbial community composition differing by, for instance, up to 17%. While we found that plants of different genotypes were associated with variation in rhizosphere assemblages, we did not see an effect on soil conditioned by a particular host plant circadian phenotype on subsequent generations of plants. Our results suggest that rhizosphere microbiomes are dynamic at sub-24-hour periods, and those dynamics are shaped by diel cycling in host plant phenotype. IMPORTANCE We find that the rhizosphere microbiome shifts in composition and extractable DNA concentration in sub-24-hour periods as influenced by the plant host's internal clock. These results suggest that host plant clock phenotypes could be an important determinant of variation in rhizosphere microbiomes.
This is Barthes’ seminal text reimagined in a contemporary context by contemporary academics. Through a revisiting of Mythologies, a key text in cultural and media studies, this volume explores the ...value these disciplines can add to an understanding of contemporary society and culture. Leading academics in media, English, education, and cultural studies here are tasked with identifying the "new mythologies" some fifty or so years on from Barthes’ original interventions. The contributions in this volume, then, are readings of contemporary culture, each engaging with a cultural event, practice, or text as mythological. These readings are then contextualized by an introduction which reflects on the ‘how’ of these engaging responses and an "essay at the back of the book" which replaces Myth Today with a reflection on the contemporary provenance of both Barthes and his most famous book. Thus the book is at least two things at once whichever way you look: a ‘new’ Mythologies and a book about Barthes’ legacy, an exploration of the place of theory in critical writing, and a book about contemporary culture.
Microstimulation mapping identified vocalization areas in primate anterior cingulate cortex. Rat anterior cingulate and medial prefrontal areas have also been intensely investigated, but we do not ...know, how these cortical areas contribute to vocalizations and no systematic mapping of stimulation‐evoked vocalizations has been performed. To address this question, we mapped microstimulation‐evoked (ultrasonic) vocalizations in rat cingulate and medial prefrontal cortex. The incidence of evoked vocalizations differed markedly between frontal cortical areas. Vocalizations were most often evoked in posterior prelimbic cortex and cingulate area 2, whereas vocalizations were rarely evoked in dorsal areas (vibrissa motor cortex, secondary motor cortex and cingulate area 1) and anterior areas (anterior prelimbic, medial‐/ventral‐orbital cortex). Vocalizations were observed at intermediate frequencies in ventro‐medial areas (infralimbic and dorsopeduncular cortex). Various complete, naturally occurring calls could be elicited. In prelimbic cortex superficial layer microstimulation evoked mainly fear calls with low efficacy, whereas deep layer microstimulation evoked mainly 50 kHz calls with high efficacy. Vocalization stimulation thresholds were substantial (70–500 μA, the maximum tested; on average ~400 μA) and latencies were long (median 175 ms). Posterior prelimbic cortex projected to numerous targets and innervated brainstem vocalization centers such as the intermediate reticular formation and the nucleus retroambiguus disynaptically via the periaqueductal gray. Anatomical position, stimulation effects and projection targets of posterior prelimbic cortex were similar to that of monkey anterior cingulate vocalization cortex. Our data suggest that posterior prelimbic cortex is more closely involved in control of vocalization initiation than in specifying acoustic details of vocalizations.
We mapped microstimulation‐evoked (ultrasonic) vocalizations in rat frontal cortices and revealed that the incidence of evoked vocalizations differed markedly between frontal cortical areas. Vocalizations were most often evoked in posterior prelimbic cortex and cingulate area 2. Posterior prelimbic cortex projected to numerous targets and innervated brainstem vocalization centers disynaptically via the periaqueductal gray.
Did Trajan really deserve his reputation as the embodiment of all imperial virtues? Why did Dante, writing in the Middle Ages, place him in the sixth sphere of Heaven among the Just and Temperate ...rulers?In this, the only biography of Trajan available in English, Julian Bennett rigorously tests the substance of this glorious reputation. Surprisingly, for a Roman emperor, Trajan comes through the test with his reputation relatively intact.
Did Trajan really deserve his reputation as the embodiment of all imperial virtues? Why did Dante, writing in the Middle Ages, place him in the sixth sphere of Heaven among the Just and Temperate ...rulers?In this, the only biography of Trajan available in English, Julian Bennett rigorously tests the substance of this glorious reputation. Surprisingly, for a Roman emperor, Trajan comes through the test with his reputation relatively intact.
A common feature of Turkey's principal military-focused museums and of many local ones also, are displays of military equipment used in the First World War and in Turkey's War of Independence ...(1919-1923). In many cases these are rifles and bayonets supplied by Germany to the Ottoman Empire during two specific periods: from 1887 to 1903, when Germany supplied all the modern infantry weaponry used by the Ottoman army; and from 1916 to 1918, when Berlin answered the request from Constantinople for the latest models of their own small arms. This article looks into the circumstances behind that request and the German response, with a focus on the bayonets that were provided, as these are most often seen in places open to the public today. In addition, a brief account is provided on how these rifles and bayonets remained in service use, often in a modified form, until the 1950s.
The Imperial German Army (Deutsches Herr) was unique among the combatants in World War One (WW1) in issuing to a proportion of its soldiers a bayonet whose blade back was fashioned as a saw. A common ...belief developed quickly among the Allies that these sawback bayonets were weapons specifically intended to inflict a particularly vicious type of wound. After setting out the origins of this class of weapon and explaining their real purpose, the two main types of sawback bayonet available to the Deutsches Heer during WW1 are then concisely described. Its reputation as a weapon of especial barbarity is outlined, along with an overview of bayonet use in combat between the mid-nineteenth century and 1918, as evidenced by official sources, highlighting the lack of any specific contemporary references to the use of or the wounds caused by sawback bayonets. The article concludes by detailing the contemporary German sources relevant to its withdrawal from service use in 1917.
From its introduction in 1874 until the turn of the nineteenth century the principal infantry firearm of the Ottoman army was the American-made .45 (11.43 × 55R) calibre Peabody-Martini Rifle. ...Remaining in use with secondary units until 1916/1917, three bayonet types were provided for the rifle during its official service life: a quadrilateral cross-sectioned socket form, followed by a yataghan-style sword bayonet, and finally a shortened and straightened version of this same yataghan bayonet. As such these three bayonets provide a classic illustration of bayonet typology for the period. However, their history and characteristics have never been assessed in detail, an omission this article seeks to remedy.
A known total of 83 World War One period Pattern 1907 bayonets for the 'Rifle, Short, Magazine, Lee-Enfield, Mark III' have pommel markings indicating issue to the Royal Air Force, formed on 1st ...April 1918. They bear alpha-numeric serial markings best interpreted as stock-taking marks, suggesting a maximum total of 70,000 were allocated for use by that air force. The written sources indicate that from at least 1922 to 1937, bayonets and the rifles to go with them were a regular part of an aircraftman's equipment. Neither these nor a search of unpublished documents in the National Archives and the British Library provide a possible explanation why these weapons would be issued to the Royal Air Force, suggesting an archaeo-historical approach was more appropriate. This article sets out our results and conclusions on the subject.
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