摘要:
A method to generate siRNAs in vivo is described, as are constructs and compositions useful in the method. The method does not depend on the use of DNA or synthetic constructs that contain inverted duplications or dual promoters so as to form perfect or largely double -stranded RNA. Rather, the method depends on constructs that yield single-stranded RNA transcripts, and exploits endogenous or in vivo-produced miRNAs or siRNAs to initiate production of siRNAs. The miRNAs or siRNAs guide cleavage of the transcript and set the register for production of siRNAs (usually 21 nucleotides in length) encoded adjacent to the initiation cleavage site within the construct. The method results in specific formation of siRNAs of predictable size and register (phase) relative to the initiation cleavage site. The method can be used to produce specific siRNAs in vivo for inactivation or suppression of one or more target genes or other entities, such as pathogens.
摘要:
The present invention provides methods and apparatus for cleansing blood through hemodialysis by the process of diffusion across a membrane into dialysate. This dialyzer also removes solutes from the blood by a process of convection, where fluid and dissolved solutes pass through the membrane out of the blood. In one embodiment in accordance with the present invention, the MECS dialyzer uses a counter-flow between the dialysate and blood through a plurality of microchannels. The dialyzer comprises a plurality of flat semi-permeable membranes interleaved between microchannel sheets to define a plurality of flow channels. The stack of membranes and microchannel sheets are aligned and consolidated to form the MECS dialyzer. The MECS dialyzer acts as a flow manifold with ports and headers to collect the blood and dialysate and direct them to and from the microchannels.
摘要:
Embodiments of the present system and method are useful for chemical deposition, particularly continuous deposition of anti-reflective films. Disclosed systems typically comprise a micromixer and a microchannel applicator. A deposition material or materials is applied to a substrate to form a nanostructured, anti-reflective coating. Uniform and highly oriented surface morphologies of films deposited using disclosed embodiments are clearly improved compared to films deposited by a conventional batch process. In some embodiments, a scratch-resistant, anti-reflective coating is applied to a polycarbonate substrate, such as a lens. In certain embodiments, an anti-reflective coating is applied to a surface of a solar catalytic microreactor suitable for performing endothermic reactions, where energy is provided to the reactor by absorption of solar radiation. The composition and morphology of the material deposited on a substrate can be tailored. The process can be used at low temperatures as a post-deposition, high-temperature annealing step is obviated.
摘要:
A power module assembly includes a reactor vessel containing a reactor core surrounded by a primary coolant. A containment vessel is adapted to be submerged in a containment cooling pool and to prohibit a release of the primary coolant outside of the containment vessel. A secondary cooling system is configured to remove heat generated by the reactor core. The heat is removed by circulating liquid from the containment cooling pool through the primary coolant.
摘要:
The present disclosure describes devices useful for microscale fluid purification, separation, and synthesis devices. Generally, such devices comprise a fluid membrane that separates two or more fluids flowing through plural microchannels operatively associated with the membrane. The fluids can both be liquids, gases, or a liquid and a gas, such as may be used for gas absorption into a liquid. Often, the membrane is a semipermeable membrane, such as might be used with a filtration device, such as a dialyzer. Devices of the present invention can be combined with other microscale devices to make systems. For example, the devices may be coupled with one or more microchemical microfactories, one or more micromixers, one or more microheaters; etc. Examples of devices made according to the present invention included an oxygenator, a dialzyer, microheat exchangers, etc. Particular materials had to be developed for use with certain embodiments of the device disclosed herein. For example, a new composite material was made comprising nanocrystalline cellulose filler and a polysulfone polymeric material. A dialyzer comprising the composite membrane also is disclosed. In order to make the nanocrystalline cellulose-polymer composite, a new method was devised for making an organic dispersion of nanocrystalline cellulose. The method comprised first forming an aqueous dispersion of nanocrystalline cellulose. A mixture was then formed comprising the aqueous dispersion and an organic liquid having a boiling point higher than water. The water was then selectively removed to form a second mixture comprising the nanocrystalline cellulose and the organic liquid.
摘要:
The present invention provides compounds that are inducers or inhibitors of apoptosis of apoptosis preceded by cell-cycle arrest. In addition, the present invention provides pharmaceutical compositions and methods for treating mammals with leukemia or other forms of cancer or for treating disease conditions caused by apoptosis of cells.
摘要:
A system and method for performing heat dissipation is disclosed that includes contacting a heat transfer liquid with a heat exchange surface having raised hydrophilic nanoporous nanostructures disposed adjacent a central core upon a substrate. The heat transfer liquid forms a preselected contact angle when placed on the heat exchange surface. The raised nanoporous nanostructures define channels, interconnected pathways, and voids within the nanoporous nanostructures. The nanoporous nanostructures have additional surface irregularities upon the nanostructures themselves. The nanostructures are preferably formed by depositing metal oxides or other materials upon a substrate using a Microreactor Assisted Nanomaterial Deposition (MAND) process.
摘要:
Enhancement mode, field effect transistors wherein at least a portion of the transistor structure may be substantially transparent. One variant of the transistor includes a channel layer comprising a substantially insulating, substantially transparent, material selected from ZnO, SnO2, or In2O3. A gate insulator layer comprising a substantially transparent material is located adjacent to the channel layer so as to define a channel layer/gate insulator layer interface. A second variant of the transistor includes a channel layer comprising a substantially transparent material selected from substantially insulating ZnO, SnO2 or In2O3, the substantially insulating ZnO, SnO2, or In2O3 being produced by annealing. Devices that include the transistors and methods for making the transistors are also disclosed.
摘要翻译:增强模式,场效应晶体管,其中晶体管结构的至少一部分可以是基本透明的。 晶体管的一个变体包括沟道层,该沟道层包括基本上绝缘的,基本上透明的材料,其选自ZnO,SnO 2,或In 2 O 3 3 / >。 包括基本上透明的材料的栅极绝缘体层位于与沟道层相邻的位置,以便限定沟道层/栅极绝缘体层界面。 晶体管的第二变体包括沟道层,该沟道层包括基本上透明的材料,其选自基本上绝缘的ZnO,SnO 2或In 2 O 3 3, 通过退火生产的基本绝缘的ZnO,SnO 2 2或In 2 O 3 3 N 3。 还公开了包括晶体管的器件和用于制造晶体管的方法。
摘要:
A carbonation vessel comprising a container for holding a quantity of fruits or vegetables, an insert pan separating a lower space within the container from an upper space and having a gas vent for allowing gas to flow from the upper space to the lower space, a lid covering the upper space and a top opening of the container, a sealing member positionable between the lid and the top opening of the container, and at least one clamp for clamping the lid to the top opening of the container with the sealing member therebetween, thereby sealing the vessel. In one embodiment, the vessel can retain at least thirty pounds per square inch internal pressure. The internal pressure may comprise gaseous carbon dioxide generated in the upper space of the vessel by mixing sodium bicarbonate and citric acid with water, allowing sublimation of dry ice within the upper space, or other carbon dioxide gas generating means. The pressurized carbon dioxide, through absorption into the tissue of the fruits or vegetables, leaves the fruits or vegetables with an effervescent or “fizzy” quality. Various embodiments involve orientation of a gas vent inlet within the upper space so that tipping or inverting the vessel does not allow for the inlet to become blocked by reactants or other non-gaseous substances in the insert pan or upper space of the vessel.
摘要:
A method for making epothilones and epothilone analogs is described, as are novel compounds made by the method. One embodiment of the method was used to synthesize epothilone B by a convergent approach that entailed Wittig coupling of an ylide derived from phosphonium bromide with an aldehyde. The former was prepared from propargyl alcohol by a nine-step pathway which installed both trisubstituted double bonds with clean Z configuration. Macrolactonization of a resulting seco acid provided the following intermediate diene epothilone analog. Selective saturation of the 9,10-olefin and subsequent epoxidation provided epothilone B.