摘要:
Attenuated respiratory syncytial virus (RSV) and vaccine compositions thereof are produced by introducing specific mutations associated with attenuating phenotypes into wild-type or RSV which is incompletely attenuated by cold-passage or introduction of mutations which produce virus having a temperature sensitive (ts) or cold adapted (ca) phenotype. Alternatively, recombinant RSV and vaccine compositions thereof incorporate attenuating and other mutations specifying desired structural and or phenotypic characteristics in an infectious RSV. Recombinant RSV incorporate desired mutations specified by insertion, deletion, substitution or rearrangement of a selected nucleotide sequence, gene, or gene segment in an infectious RSV clone. The immune system of an individual is stimulated to induce protection against natural RSV infection, or multivalently against infection by RSV and another pathogen, such as PIV, by administration of attenuated, biologically derived or recombinant RSV.
摘要:
The invention relates to a film or a layer made of semi-conducting material with low defect density in the thin layer, and a SOI-disk with a thin silicon layer exhibiting low surface roughness, defect density and thickness variations. The invention also relates to a method for producing a film or a layer made of semi-conductive material. Said method comprises the following steps: a) producing structures from a semi-conductive material with periodically repeated recesses which have a given geometrical structure, b) thermally treating the surface structured material until a layer with periodically repeated hollow spaces is formed under a closed layer on the surface of the material, c) separating the closed layer on the surface along the layer of hollow spaces from the remainder of the semi-conductive material.
摘要:
An expandable port for minimally invasive surgery includes a first section, a second section, and at least one intermediate section. The port is expandable from a closed configuration in which the first section is proximate the second section along at least a portion of a length of the first section to an expanded configuration in which the first section is spaced apart from the second section. The intermediate portion spans a gap between the first section and the second section when the port is in the expanded configuration.
摘要:
A semiconductor substrate useful as a donor wafer is a single-crystal silicon wafer having a relaxed, single-crystal layer containing silicon and germanium on its surface, the germanium content at the surface of the layer being in the range from 10% by weight to 100% by weight, and a layer of periodically arranged cavities below the surface. The invention also relates to a process for producing this semiconductor substrate and to an sSOI wafer produced from this semiconductor substrate.
摘要:
A process for producing a semiconductor substrate comprising a carrier wafer and a layer of single-crystalline semiconductor material: a) producing a layer containing recesses at the surface of a donor wafer of single-crystalline semiconductor material, b) joining the surface of the donor wafer containing recesses to the carrier wafer, c) heat treating to close the recesses at the interface between the carrier wafer and the donor wafer to form a layer of cavities within the donor wafer, and d) splitting the donor wafer along the layer of cavities, resulting in a layer of semiconductor material on the carrier wafer. Semiconductor substrates prepared thusly may have a single-crystalline semiconductor layer having a thickness of 100 nm or less, a layer thickness uniformity of 5% or less, and an HF defect density of 0.02/cm2 or less.
摘要翻译:一种制造半导体衬底的方法,包括载体晶片和单晶半导体材料层:a)在单晶半导体材料的施主晶片的表面上产生包含凹陷的层,b)将所述供体的表面 晶片容纳凹槽到载体晶片,c)热处理以封闭载体晶片和施主晶片之间的界面处的凹槽,以在施主晶片内形成一层空腔,以及d)沿着该空腔层分裂施主晶片 ,从而在载体晶片上产生一层半导体材料。 因此制备的半导体衬底可以具有厚度为100nm以下,层厚均匀度为5%以下,HF缺陷密度为0.02 / cm 2以下的单晶半导体层 。
摘要:
Chimeric human-bovine respiratory syncytial virus (RSV) are infectious and attenuated in humans and other mammals and useful in immunogenic compositions for eliciting an anti-RSV immune response. Also provided are isolated polynucleotide molecules and vectors incorporating a chimeric RSV genome or antigenome which includes a partial or complete human or bovine RSV “background” genome or antigenome combined or integrated with one or more heterologous gene(s) or genome segment(s) of a different RSV strain. Chimeric human-bovine RSV of the invention include a partial or complete “background” RSV genome or antigenome derived from or patterned after a human or bovine RSV strain or subgroup virus combined with one or more heterologous gene(s) or genome segment(s) of a different RSV strain or subgroup virus to form the human-bovine chimeric RSV genome or antigenome. In preferred aspects of the invention, chimeric RSV incorporate a partial or complete bovine RSV background genome or antigenome combined with one or more heterologous gene(s) or genome segment(s) from a human RSV. Genes of interest include any of the NS1, NS2, N, P, M, SH, M2(ORF1), M2(ORF2), L, F or G genes or a genome segment including a protein or portion thereof. A variety of additional mutations and nucleotide modifications are provided within the human-bovine chimeric RSV of the invention to yield desired phenotypic and structural effects.
摘要:
An integrated buffer circuit configuration has two inverters which are mutually connected in series. A circuit node lies between the two inverters. At least the first inverter is a CMOS inverter for an input signal IN. The CMOS inverter has an n-channel transistor which is connected to a first supply potential. The source of a p-channel transistor is connected with a constant current source. A first enable transistor is connected between the n-channel transistor of the first inverter and the circuit node. A second enable transistor is connected in parallel to the configuration formed by the constant current source and the p-channel transistor of the first inverter. The gates of the enable transistors are connected with the enable input of the buffer circuit. An enable signal present at the enable input makes it possible to deactivate the buffer circuit in the case of disturbances with a known course over time. A MOS-transistor may function as the constant current source. The MOS-transistor is then connected to a second supply potential and its gate lies at reference potential with a value with always has a constant difference with respect to the second supply potential. During operation, the MOS-transistor is conducting.
摘要:
An integrated buffer circuit configuration has two inverters which are mutually connected in series. The first inverter includes an n-channel transistor and a constant current source. The source of the n-channel transistor is connected to a first supply potential. The drain of the transistor is connected with the constant current source through a first enable transistor. A second enable transistor is connected parallel to the constant current source. The gates of enable transistors are connected with the enable input of the buffer circuit. An enable signal present at the enable input makes it possible to deactivate the buffer circuit in the case of disturbances with a known course over time. A MOS transistor may function as the constant current source. The MOS transistor is then connected to a second supply potential and its gate lies at reference potential with a value with always has a constant difference with respect to the second supply potential. During operation, the MOS transistor is conducting.
摘要:
An integrated circuit for generating a reset signal includes terminals for a first and a second supply potential. A serial RC network is connected between the terminals. The RC network has an ohmic component, a capacitive component and a first circuit node of the integrated circuit connected between the components. An initializing circuit is connected parallel to the RC network. The initializing circuit has an output forming a second circuit node of the integrated circuit carrying a potential with a maximum value specified by dimensioning the initializing circuit, when the first supply potential is applied. An inverter circuit is connected between the first circuit node and the terminal for the second supply potential in terms of supply voltage. The inverter circuit has an input connected to the second circuit node and an output forming a third circuit node of the integrated circuit. A transistor has a source-to-drain path connected between the second circuit node and the terminal for the second supply potential and has a gate connected to the third circuit node. An additional inverter has an input at the third circuit node and an output forming a fourth circuit node of the integrated circuit at which a reset signal is present during operation.
摘要:
Provided herein are improved methods for the formulation of compositions comprising placental stem cells, and improved compositions and cell formulations produced thereby.