2,995 research outputs found
The locations of collection and collectors of specimens described by Labillardierc in 'Novae Hollandiae Plantarum Specimen' - additional notes
Several plants described by Labillardire and indicated to have been collected in Tasmania are shown to be species endemic to Western Australia. The locations are corrected and collectors are indicated if the original specimens could not have been collected by Labillardiere. The reasons for these errors are discussed and it is
concluded that caution is required in accepting Labillardiere's type locations
The natural history observations and collections made during Furneaux's visit to Tasmania (Van Diemen's Land) in 1773 with special reference to botany
During the visit of H.M.S. ADVENTURE to Tasmania in March 1773 a number of animals and birds were caught or observed; several of the birds were later drawn. As well, Tobias Furneaux, captain of ADVENTURE, collected seeds of at least two plants, Eucalyptus obliqua and Leptospermum lanigerum, and herbarium specimens of the latter, which were brought back to England. The seeds were germinated and plants were growing in London gardens in the late 1770's. The possible existence of other herbarium specimens is discussed, and the reasons for the small amount of scientific collection by ADVENTURE's complement are discussed
Experimental and computational investigation of co production and dispersion in an automotive repair shop
Carbon monoxide (CO), a highly toxic gas, is produced during the incomplete combustion of carbon-based fuels. In indoor environments, high CO concentrations constitute a serious occupational health hazard; this is especially true in the case of automotive repair shop (ARS) employees who are exposed on a daily basis to vehicle exhaust streams. The present study focuses on the experimental investigation and numerical simulation of CO production and dispersion inside an ARS facility. Detailed measurements of CO concentration, vehicle traffic and ventilation system velocities are performed; the obtained data are appropriately formulated to provide quantitative information for modelling purposes. A detailed Computational Fluid Dynamics simulation of the developing transient flow-field is performed. The numerical results are validated using the experimental data; an overall good qualitative and quantitative agreement is achieved. Aiming to improve the energy efficiency of the mechanical ventilation system, three alternative scenarios are investigated; it is shown that the utilization of a dynamic ventilation system may result in significant energy consumption benefits, while, at the same time, CO concentrations remain below the values suggested by current occupational health legislation. The obtained results may be utilized to assist the design of mechanical ventilation systems for ARS facilities
Scientific Opinion on the safety and efficacy of disodium 5?-ribonucleotides, disodium 5?-guanylate, disodium 5?-inosinate for all animal species and categories
The flavours included in this assessment are widely present in nature as the building blocks of DNA and RNA. In the absence of any information on the microbial strains or substrates used for the production of the additives, and with little information on the manufacturing process, the FEEDAP Panel is unable to ascertain whether the manufacturing process introduces any safety concerns. Disodium 5′-guanylate and disodium 5′-inosinate and their mixture are considered to be safe for the target animals and the consumer. However, considering the lack of information on the production process, these conclusions apply only to the compounds ‘per se’ and their extrapolation to any feed additive containing these compounds is not possible. In the absence of any data related to hazard to the user, it would be prudent to regard disodium 5′-guanylate and disodium 5′-inosinate and their mixture as potentially hazardous to workers by skin or inhalation exposure. The compounds under assessment are naturally present in feed materials; therefore, no risk to the safety for the environment is foreseen. Since these compounds are used in food as flavourings, and their function in feed is essentially the same as that in food, no further demonstration of efficacy is necessary
Recommended from our members
Discovering the Phylodynamics of RNA Viruses
The advent of extremely high throughput
DNA sequencing ensures that genomic
data from microbial organisms can be
acquired in unprecedented quantities and
with remarkable rapidity. Although this
genomic revolution will affect all microbes
alike, our focus here is on RNA viruses, as
the rapidity of their evolution, which is
observable over the time scale of human
observation, allows phylodynamic inferences
to be made with great precision. In
the foreseeable future it is likely that
complete genome sequencing will become
the standard method of viral characterization,
providing the highest possible resolution
for phylogenetic studies. The rapidity
with which genome sequence data were
generated from the ongoing epidemic of
swine-origin H1N1 influenza A virus [1] is
testament to the power of this technology
Controlled interfacial assembly of 2D curved colloidal crystals and jammed shells
Assembly of colloidal particles on fluid interfaces is a promising technique
for synthesizing two-dimensional micro-crystalline materials useful in fields
as diverse as biomedicine1, materials science2, mineral flotation3 and food
processing4. Current approaches rely on bulk emulsification methods, require
further chemical and thermal treatments, and are restrictive with respect to
the materials employed5-9. The development of methods that exploit the great
potential of interfacial assembly for producing tailored materials have been
hampered by the lack of understanding of the assembly process. Here we report a
microfluidic method that allows direct visualization and understanding of the
dynamics of colloidal crystal growth on curved interfaces. The crystals are
periodically ejected to form stable jammed shells, which we refer to as
colloidal armour. We propose that the energetic barriers to interfacial crystal
growth and organization can be overcome by targeted delivery of colloidal
particles through hydrodynamic flows. Our method allows an unprecedented degree
of control over armour composition, size and stability.Comment: 18 pages, 5 figure
- …