摘要:
Nonsymbiotic hemoglobins are broadly present across evolution; however, the function of these proteins is unknown. Cultured maize cells have been transformed to constitutively express a barley hemoglobin gene in either the sense (HB+) or antisense (HB−) orientation. Hemoglobin protein in the transformed cell lines was correspondingly higher or lower than in wild type cells under normal atmospheric conditions. Limiting oxygen availability, by placing the cells in a nitrogen atmosphere for 12 hours, had little effect on the energy status of cells constitutively expressing hemoglobin, but had a pronounced effect on both wild type and HB− cells, where ATP levels declined by 27% and 61% respectively. Energy charge was relatively unaffected by the treatment in HB+ and wild type cells, but was reduced from 0.91 to 0.73 in HB− cells suggesting that the latter were incapable of maintaining their energy status under the low oxygen regime. Similar results were observed with P. aeruginosa cells transformed with an Hb expression vector. It is suggested that nonsymbiotic hemoglobins act to maintain the energy status of cells in low oxygen environments and that they accomplish this effect by promoting glycolytic flux through NADH oxidation, resulting in increased substrate level phosphorylation. Nonsymbiotic hemoglobins are likely ancestors of an early form of hemoglobin that sequestered oxygen in low oxygen environments, providing a source of oxygen to oxidize NADH to provide ATP for cell growth and development. This in turn suggests that cells containing increased levels of Hb protein will survive longer under low oxygen tension or high energy demand.
摘要:
A bioactive glass composition comprising one or more glasses comprising Si02, P205 and a fluoride, the Si02 content being less than 40 mole %, the P205 content being at least 4 mole %, and the fluoride content being greater than 1 mole %. The bioactive glass or glass-ceramic can be used in a number of medical applications, including dental applications such as toothpaste.
摘要翻译:一种生物活性玻璃组合物,其包含一种或多种包含SiO 2,P 2 O 5和氟化物的玻璃,SiO 2含量小于40摩尔%,P205含量为至少4摩尔%,氟含量大于1摩尔%。 生物活性玻璃或玻璃陶瓷可用于许多医疗应用,包括牙科应用如牙膏。
摘要:
An enhanced system and method for handling, matching and executing a diverse group of limit-priced orders in an electronic options environment is disclosed. Most of the order types disclosed are automatically repriced and reposted as the NBBO changes to increase their execution opportunities. Market maker entitlements are integrated with the order processing, so that the market maker is guaranteed an allocation of the trade if the market maker is at the NBBO when an order priced at or better than the NBBO is received. Once posted to the order book, the displayed price of an order may be eligible for preferential execution in a market maker entitlement process, regardless of whether the displayed price is original or has been automatically repriced.
摘要:
An auto-injector for dispensing a predetermined dose of medicament is disclosed. The auto-injector includes a needle cover operative to engage an injection site. The needle cover is configured to move from a retracted position prior to a medicament dispensing operation to an extended locked position after the medicament dispensing operation. Any residual activation force remaining after the medicament dispensing operation is contained within the auto-injector and is not directed to the needle cover, thus attenuating, if not eliminating, any kickback effect.
摘要:
The present invention relates to the use of Ulocladium oudemansii as a biological control agent. Processes and compositions for the biological control of Botrytis species using Ulocladium oudemansii are also provided.
摘要:
The present invention provides a method of modifying a plant phenotype by transforming a plant to alter the level of expression of non-symbiotic plant hemoglobin in the plant, whereby the transformed plant exhibits, under normal oxygen conditions, a plant phenotype that is modified as compared to a non-transformed plant. Plants exhibiting modified phenotypes under normal oxygen conditions also are provided. Methods of modifying the response to a plant hormone in a plant also are provided.
摘要:
An automatic medicament injector having a compartment for a dry medicament component and a compartment for a wet medicament component. The two compartments are separated by a seal structure that converts from a sealing condition to a mixing condition when the device is activated. The seal structure includes a wiper that scrapes the interior walls in the dry component compartment to prevent the dry component from accumulating at the seal/glass interface. A tapered insert funnels the mixed medicament components to an attached needle assembly, but can be removed when the device is filled. A filter is provided between the medicament compartments and the needle assembly. A chamber between the filter and the needle allows for better flow through the filter. An actuation assembly drives the seal structure into the mixing condition and forces the mixed medicament through the needle and into the user.
摘要:
An automatic medicament injector having a compartment for a dry medicament component and a compartment for a wet medicament component. The two compartments are separated by a seal structure that converts from a sealing condition into a mixing condition when the device is activated. The seal structure includes a wiper that scrapes the interior walls in the dry component compartment to prevent the dry component from accumulating at the seal/glass interface. A tapered insert funnels the mixed medicament components to an attached needle assembly, but can be removed when the device is filled. A filter is provided between the medicament compartments and the needle assembly. A chamber between the filter and the needle allows for better flow through the filter. An actuation assembly drives the seal structure into the mixing condition and forces the mixed medicament through the needle and into the user.
摘要:
A reprice-to-block order and related market center and process are disclosed which automatically reprice a posted limit order to the price of a block trade executed at an inferior price on a market away from the market center that posted the limit order.
摘要:
An anti-internalization order modifier and related market center and process are disclosed which prevent orders sent from the same trading firm from executing against one another on the posting market center the orders are posted on.