摘要:
The present inventors conducted dedicated studies and successfully constructed expression vectors that enable high-level production of foreign gene-derived proteins in mammalian host cells, which comprise a translation-impaired dihydrofolate reductase gene cistron whose expression has been attenuated by altering the codons to the least frequently used codons in mammals; and a gene cassette which has a cloning site for incorporation of a foreign gene between a highly transcriptionally active promoter and a highly stable polyadenylation signal.
摘要:
The present inventors successfully constructed expression vectors that enable high-level production of foreign gene-derived proteins in mammalian host cells, which comprise a translation-impaired drug resistance gene cistron whose expression has been attenuated by altering the codons to the least frequently used codons in mammals; and a gene cassette which has a cloning site for incorporation of a foreign gene between a highly transcriptionally active promoter and a highly stable polyadenylation signal.
摘要:
The present inventors conducted dedicated studies and successfully constructed expression vectors that enable high-level production of foreign gene-derived proteins in mammalian host cells, which comprise a translation-impaired dihydrofolate reductase gene cistron whose expression has been attenuated by altering the codons to the least frequently used codons in mammals; and a gene cassette which has a cloning site for incorporation of a foreign gene between a highly transcriptionally active promoter and a highly stable polyadenylation signal.
摘要:
As a result of dedicated research, the present inventors have successfully invented a collagen gene construct which can be easily purified and maintains a triple helix structure equivalent to that of naturally-occurring collagen while having a low molecular weight. Specifically, one-step purification by affinity purification is enabled because CR-D (a signal peptide) has a carbohydrate recognition domain. By substituting a portion of a human collagen structural gene of the present invention with the collagen-like structural gene portion of MBL, a low-molecular-weight collagen which maintains a triple helix structure and is thermally stable can be obtained with high purity and in large quantities.
摘要:
As a result of dedicated research, the present inventors have successfully invented a collagen gene construct which can be easily purified and maintains a triple helix structure equivalent to that of naturally-occurring collagen while having a low molecular weight. Specifically, one-step purification by affinity purification is enabled because CR-D (a signal peptide) has a carbohydrate recognition domain. By substituting a portion of a human collagen structural gene of the present invention with the collagen-like structural gene portion of MBL, a low-molecular-weight collagen which maintains a triple helix structure and is thermally stable can be obtained with high purity and in large quantities.
摘要:
The present inventors successfully constructed expression vectors that enable high-level production of foreign gene-derived proteins in mammalian host cells, which comprise a translation-impaired drug resistance gene cistron whose expression has been attenuated by altering the codons to the least frequently used codons in mammals; and a gene cassette which has a cloning site for incorporation of a foreign gene between a highly transcriptionally active promoter and a highly stable polyadenylation signal.
摘要:
The invention provides transition metal complex compounds, high-activity olefin oligomerization catalysts containing the compounds, and olefin oligomerization processes using the catalysts.A transition metal complex compound [A] according to the invention is represented by Formula (I) or Formula (I′) below. An olefin oligomerization catalyst includes the transition metal complex compound [A]. In an olefin oligomerization process of the invention, an olefin is oligomerized in the presence of the catalyst.
摘要:
An apparatus for treating an exhaust gas that includes a pre-treatment section that removes a powdery component, a water-soluble component or a hydrolytic component from the exhaust gas. The exhaust gas contains a fluorine compound and CO. A heating oxidative decomposing section performs heating oxidative decomposition of at least one of the fluorine compound and CO to detoxify the exhaust gas. The apparatus also has a post-treatment section for post-treating an acid gas such as HF which has been produced by the heating oxidative decomposition.
摘要:
A semiconductor light emitting device made of nitride III-V compound semiconductors is includes an active layer made of a first nitride III-V compound semiconductor containing In and Ga, such as InGaN; an intermediate layer made of a second nitride III-V compound semiconductor containing In and Ga and different from the first nitride III-V compound semiconductor, such as InGaN; and a cap layer made of a third nitride III-V compound semiconductor containing Al and Ga, such as p-type AlGaN, which are deposited in sequential contact.
摘要:
An electric contact of high performance that is constituted of a Cd-free Ag alloy posing no toxic problem, excels in insulating capability and can ensure stability of brazing and consumption characteristics and that can be used in a breaker or high-load electromagnetic switch; and electrical equipment including the electric contact. In particular, an electric contact comprised of an Ag alloy containing 1 to 9 mass % of Sn in which the amount of Cd as impurity is 0 or less than 0.01 mass %, the electric contact having a double layer structure composed of a surface-side first layer and an interior second layer wherein the first layer has a thickness of 10 μm or greater and has an average hardness of 150 or higher on the microvickers scale stipulated in JIS while the second layer has an average hardness of higher than 130 on the same scale.