117,488 research outputs found
NERVA – RIC II, p. 224, no. 19
No full textSilver denarius, 2.8 grams.Mint: Rome.Date: 97 CE.OBV: Laureate head of Nerva, r.; IMP NERVA CAES A[VG P]M TR P COS III P P.REV: Libertas, draped and standing l., holding pileus in right hand and short scepter, pointing up slightly to right, in left hand; LIBERTAS PVBLICA.Bibl.: BMC Emp. III, p. 6, no. 46, Cohen II, p. 10, no. 113
Reclassification of the serows and gorals: the end of a neverending story?
No full textTaxonomy is partly a subjective matter, but it is instrumental for ecological, behavioural and especially conservation studies. According to the International Union for Conservation of Nature, goat-antelopes (Bovidae: Rupicaprini tribe) number 13 species, 62% of which are Threatened' or Near Threatened' with extinction. During recent decades, the number of extant species of goat-antelopes - especially in endemic Asian genera (goral: six species Naemorhedus spp.; serow: seven species Capricornis spp.) - has been inflated. We have revised the taxonomy and phylogeny of the gorals and serows, for the first time using the total mitochondrial genome of all taxa. We confirm the existence of three goral and four serow species. We can find no justification for the existence of Naemorhedus griseus (Chinese goral), Naemorhedus bedfordi (Himalayan goral) and Naemorhedus evansi (Burmese goral), which should be pooled together within Naemorhedus goral (brown goral). Two species of mainland serow are also recognised: Capricornis rubidus (red serow) and Capricornis sumatraensis (Sumatran serow). Capricornis rubidus and Naemorhedus baileyi (red goral) are the forms more closely related to the common Pliocenic, still-unknown ancestor. Among serows, Capricornis crispus is sister to all remaining species. Capricornis rubidus and Capricornis swinhoei (Formosan serow) are sister species, probably the remnants of an older radiation of mainland serows
Nerva coin, 96-98 AD
No full textNervaLibertas standing L., Libertas PublicaSestertiusS859AEEFSbeitlaThe Bill F. Kelso Collection of Ancient Coins contains coins from around the world. These ancient coins are from the following places and eras: Greece, Carthage, the Roman Republic and Empire, St. Constantine era, Byzantine, Arabic, China, and the Vandals. Also included are reference materials and photographs
NERVA irradiation program, GTR test 21. Volume 3 - Thermal conductivity and electrical resistivity of selected NERVA materials
No full textThermal conductivity and electrical resistivity of materials for NERVA engine - Vol.
NERVA -Contributing Today and Tomorrow
No full textThe year 1968 has seen accomplishment of important goals in the technology development phase of the NERVA* program, including demonstration of the capability of the nuclear reactor to operate for 60 minutes at full-rated power, proving the ability of the system and components to meet specifications.
Based on the success of the technology development program, conceptual studies and designs leading to selection of the configuration for flight application were initiated.
From this complex R&D program a promise has come of many new and important technological developments. As various areas of research were opened to prove the feasibility of nuclear rocket propulsion, many conventional techniques required modification, due to the unique environment of the nuclear rocket.
Some of the significant technology now in use by the nonspace community that was originally developed by the engine contractor for the NERVA program will be described. Further, an extrapolation of some other technology areas currently being investigated and a suggestion of potential applications beyond those obvious in the earlier discussion will be presented
On-line digital computer control of the NERVA nuclear rocket engine
No full textThe problem of on-line digital computer control of the NERVA nuclear rocket engine is considered. Proposed is a method of State Dependent State Variable Feedback (SDSVF) as a practical approach to the control of NERVA and other complex nonlinear and/or time-varying systems. The difficulties inherent in other design methods are avoided by defining the optimal closed loop system in terms of a desired transfer function, rather than a performance index to maximize or minimize
Microscale analysis of soil characteristics and microbiomes reveals potential impacts on plants and fruit: vineyard as a model case study
No full textAims: Soil microbiome roles in agriculture is becoming more and more important. This importance is also reflected on the way plants are seen: complex organisms formed by the plant itself plus the microbes inhabiting its tissues, including the ones on the surface of every organ and the ones adhered or in proximity to the roots. In addition, as already demonstrated, the microbial community associated with a specific soil is able to predetermine the health status of crops. For all the above mentioned reasons, defining the microbial composition of agricultural soils and the factors driving the assemblage is pivotal to achieve more sustainable agriculture and viticulture. Methods: We aimed to investigate how the soil geological characteristics influence the microbiome composition associated with close geographically related vineyards. Moreover, we studied both the top (15 cm in depth) and deep (120 cm in depth) soil layers as anthropically influenced and almost-undisturbed soil, respectively. Results: We observed slightly different microbial communities despite the close geographical proximity of the two vineyards, which is considered one of the main determinants of the soil microbiome composition. In addition, we found that the geological characteristics of the two soils influence both the root distribution and the accumulation of pathogen- and symbiont-related genera. Sensory profiles of the Grillo wines from the two different soils confirmed the tight link between soil origin and wine traits. Conclusions: In the present study, we highlight that the geological characteristics of soil can influence soil microbial composition and assemblage in close geographically related vineyards, with a potential effect on wine features
Aspergillus goes viral: Ecological insights from the geographical distribution of the mycovirome within an aspergillus flavus population and its possible correlation with aflatoxin biosynthesis
No full textMicrobial multi-level interactions are essential to control the success of spreading and survival of most microbes in natural environments. Phytopathogenic mycotoxigenic fungal species, such as Aspergillus flavus, represent an important issue in food safety. Usually, non-toxigenic strains are exploited for biocontrol strategies to mitigate infections by toxigenic strains. To comprehend all the biological variables involved in the aflatoxin biosynthesis, and to possibly evaluate the interplay between A. flavus toxigenic and non-toxigenic strains during intraspecific biocompetition, the “virological” perspective should be considered. For these reasons, investigations on mycoviruses associated to A. flavus populations inhabiting specific agroecosystems are highly desirable. Here, we provide the first accurate characterization of the novel mycovirome identified within an A. flavus wild population colonizing the maize fields of northern Italy: a selection of A. flavus strains was biologically characterized and subjected to RNAseq analysis, revealing new mycoviruses and a peculiar geographic pattern distribution in addition to a 20% rate of infection. More interestingly, a negative correlation between viral infection and aflatoxin production was found. Results significantly expanded the limited existent data about mycoviruses in wild A. flavus, opening new and intriguing hypotheses about the ecological significance of mycoviruses
Effects of the Fractionation of the Nitrogen Fertilization on Root Nitrate Uptake and Vine Agronomic Performance in Pinot Gris Grapevines in a Temperate Climate
No full textThe study aims to investigate at a physiological and molecular level the root absorption of nitrogen (N) during the annual cycle of grapevine. The study was performed on potted Pinot Gris plants grafted on Kober 5BB and grown for two consecutive years in a semi-controlled environment (Northeast, Italy). The study compared the response of plants N-fertilized in spring (T1), or in spring and in post-harvest (T2) or no-N fertilized (C). Results showed that under our climate conditions nitrate was taken up by the grapevines when applied both in spring or in spring and post-harvest. The nitrate acquisition in T1 roots is mediated at molecular and physiological level by a higher activation of high-affinity nitrate-transport system to take up nitrate in comparison to no-fertilized plants. Comparing the two N fertilization managements, the dynamic of nitrate uptake rates showed different patterns with an overall late response of High-Affinity Transport System when the application of part of N-fertilization was delayed to post-harvest (T2) in comparison to T1. Nevertheless, during the 2 years of the trial the fractionation of N fertilization applied in spring and post-harvest did not negatively affect the yield and quality parameters of vines. An increase of N concentration in T2 roots after two consecutive growing seasons may suggest that the fractionation can lead to beneficial effects on long period. Results of this work contribute to improve the comprehension of N acquisition in grapevine in order to optimize the use of N inputs in vineyard
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