| Description | Physical appearance: LiquidStorage buffer solution: GelRed dye, Stabilizer, 10mM Tris-HCl, 5mM EDTA, 0.03% Bromophenol Blue, 0.03% Xylene Cyanol, 30% Glycerol, pH7.6Product Description1. This product is composed of 9 linear double stranded DNA fragments, ranging in size from 100bp to 5000bp, Physical appearance: LiquidStorage buffer solution: GelRed dye, Stabilizer, 10mM Tris-HCl, 5mM EDTA, 0.03% Bromophenol Blue, 0.03% Xylene Cyanol, 30% Glycerol, pH7.6Product Description1. This product is composed of 9 linear double stranded DNA fragments, ranging in size from 100bp to 5000bp, including 100bp, 250bp, 500bp, 750bp, 1000bp, 1500bp, 2000bp, 3000bp, and 5000bp. 500bp and 1500bp are highlighted bands with concentrations 2.5 times higher than other bands, making them easier to observe after electrophoresis.2. In this product, the content of regular stripes is about 30ng, and the content of bright stripes is about 75ng.3. This product has been saved in a 1xLoading Buffer and can be directly used for electrophoresis, making it easy to use.4. This product and its accompanying 5xLoading buffer already contain Gelred nucleic acid dye, which can be used in conjunction. After electrophoresis, it can be directly observed under UV without the need for subsequent staining treatment.5. This product is not suitable for polyacrylamide gel electrophoresis.6. Recommended concentration of electrophoresis buffer and agarose gel:1xTAE electrophoresis bufferAgarose concentration: 1.5%~2.0%7. Using this product system, no nucleic acid dye is needed in agarose gel.instructions1. Prepare agarose gel with appropriate concentration and without any nucleic acid dye.2. The concentration of gel has a great influence on DNA electrophoresis. The recommended concentration of agarose gel for this product is 1.5%~2.0%.3. It is recommended to use 1xTAE buffer with an electrophoresis voltage not exceeding 10v/cm.4. The commonly used 3.5mm sample well requires a recommended amount of 3-5 µ l for DNA markers, and the sample size should be appropriately increased for wide gel wells.5. Mix the sample to be tested with the matching 5xLoading buffer in a ratio of about 4:1, and then add it to the gel sampling hole.6. Electrophoretic to appropriate distance:Because Gelred is firmly bound to DNA, it can make full use of the length of gel, and the electrophoresis distance is longer, as long as the smallest segment does not run out of the gel, so as to facilitate the electrophoresis separation of small segments. Generally, the distance between the bromophenol blue indicator band and the edge of gel shall not be less than 1cm.7. After electrophoresis, observe the electrophoresis bands under ultraviolet light.8. The 5x loading buffer included in the product is used for sampling after mixing with the sample to be tested, and contains dual indicators of bromophenol blue and xylene blue.9. If there are a large number of samples that can be directly sampled and require electrophoresis detection, it is recommended to use Gelred gel method for detection without pre mixing samples, which can save a lot of experimental time. Product componentR751622Component100 T500TStorageR751622AGelred-prestained DNA Ladder (100-5000bp)500 µL5× 500 µL-20℃. Avoid freeze/thaw cycle.R751622BGelred-prestained 5xLoading buffer 500 µL5× 500 µL-20℃. Avoid freeze/thaw cycle... Read More | Protein Purity>95% by SDS-PAGEExtinction Coeff.A276 nm = 0.456 at 1.0 mg/mLMolecular Weight8,759 Da (single chain)General DescriptionNatural human C4a is prepared by cleavage of human C4 protein by human C1s. It is produced during activation of both the classical and lectin pathways of complementProtein Purity>95% by SDS-PAGEExtinction Coeff.A276 nm = 0.456 at 1.0 mg/mLMolecular Weight8,759 Da (single chain)General DescriptionNatural human C4a is prepared by cleavage of human C4 protein by human C1s. It is produced during activation of both the classical and lectin pathways of complement. C4a is a member of the anaphylatoxin family of three proteins (C3a, C4a and C5a) produced by the activation of complement (Hugli, T.E. et al. (1981)). It is an unglycosylated polypeptidecontaining 77 amino acids with a molecular mass of 8,759 daltons. Many of the biological functions of C4a are similar to those of C3a, but the specific activities are far below those of C3a. C4a activity is so low, in fact, that it was initially thought to be inactive. These measured activities include inducing muscle contraction in the guinea pig ileum test (spasmogenic activity), desensitization of muscle to C3a stimulation suggesting that the same receptor for both C3a and C4a is involved (tachyphylactic activity) and inducing vascular permeability in human skin (Gorski J.P. et al. (1979)). C4a does not show tachyphylactic activity against C5a or chemotactic activity. Removal of the C-terminal arginine by serum carboxypeptidase N destroys all these activities (Meuller-Ortiz, S.L., et al. (2009)). C4a appears to act through the C3a receptor (C3aR) which is a G-protein coupled receptor found widely distributed on peripheral tissues, lymphoid cells (neutrohphils, monocyes, and eosinophils) and in the central nervous system (astrocytes, neurons and glial cells) (Law, S.K.A. and Reid, K.B.M. (1995)). Physical Characteristics & StructureMolecular weight: 8,759 calculated molecular mass. Observed mass (MALDI-TOF) is 8,762 + 9 mass units. pI = 9.0 to 9.5 (Gorski, J.P. et al. (1981))Amino acid sequence (77 amino acids): NVNFQKAINE KLGQYASPTA KRCCQDGVTR LPMMRSCEQR AARVQQPDCR EPFLSCCQFA ESLRKKSRDK GQAGLQRC4a is thought to be structurally very similar to C3a and C5a to which it is homologous. Thus its 3D structure is probably similar to the X-ray-derived crystal structureof C3a (Huber, R. et al. (1980)) and the NMR derived structure of C3a: Nettesheim, D.G. et al. (1988); Murray, I. et al. (1999).FunctionSee General Description above. C4a exhibits much weaker biological activities than C3a and C5a. Its activity in inducing erythema and edema in human skin is 25,000-fold weaker than that of C5a and 100-fold weaker than C3a per nanomole. The spasmogenic activity of C4a is 2000-fold weaker than C5a and 100-fold weaker than that of C3a. Due to these differences the role of C4a in these responses in vivo is thought to be negligible.AssaysTwo well established assays for C4a and C3a functional activities include induction of contraction in the guinea pig ileum and the permeation of a dye such as trypan blue from the vasculature into skin. The anaphylatoxins also induce mast cell degranulation, (measured as histamine release), platelet aggregation, IL-1 release from monocytes and the release of prostaglandins and leukotrienes from many cells and tissues. The other assays used for C3a (Dodds, A.W. and Sim, R.B. (1997)) should also respond to C4a, but few reports have described utilizing these assays with C4a. ELISA kits for the assay of C4a levels (or more correctly C4a desArg levels) in blood and other fluids are sold by several companies. These measurements are useful for detecting complement activation in vivo, but the interpretation of their meaning is complicated by the fact that clearance of the anaphylatoxins is rapid. In vivoFreshly drawn normal human serum contains significant levels of all three anaphylatoxins. Although these may represent the resting concentration in vivo it is difficult to draw or store blood without some complement activation so a true in vivo concentration is difficult to determine. The presence of EDTA and Futhan in the collection tubes can minimize this background (Pfeifer, P.H. et al. (1999)). Full activation of all C4 in blood (600µg/mL) would result in ~3,400 nM C4a (~30 µg/mL). Due to the low biological activity of C4a it could require activation of most of the C4 in a small region to achieve the micromolar C4a concentrations necessary to elicit a response.RegulationC4a levels are regulated by three processes: formation, inactivation and clearance. There are two enzymes that cleave C4 and release C4a: C1s and MASP-2. C4a is “inactivated” by removal of its C-terminal arginine amino acid. The product C4a desArg (or C4a without the C-terminal arginine) is produced by the action of the plasma enzyme carboxypeptidase N (Mueller-Ortiz S.L. et al. (2009)). The inactivation is rapid and most C4a is converted to C4a desArg within minutes of its formation. Inactivated C4a lack measurable biological activity. Because of the large number of cells bearing C3a/C4areceptors (endothelial, immune, smooth muscle, neuronal, etc.) the capture, internalization and digestion of C4a and C4a desArg probably results in its removal from circulation.DeficienciesA deficiency of C4 or a deficiency of all of the enzymes that cleave C4 to generate C4a could result in the absence of C4a. There are no known complete deficiencies of all ofthe C4 cleaving enzymes. Examples of C4 deficient humans and mice exist (Wessels, M.R. et al. (1995)), but the degree to which pathologies associated with C4 deficiency are due to the lack of C4 or the absence of C4a is unclear. DiseasesThere are no known diseases connected to C4a or C4a desArg. Precautions/Toxicity/HazardsThe source of C4a is human serum, therefore appropriate precautions must be observed even though the source was shown by certified tests to be negative for HBsAg, HTLV-I/II, STS, and for antibodies to HCV, HIV-1 and HIV-II.Injection can cause anaphylatic shock which is a generalized circulatory collapse similar to that caused by an allergic reaction.Hazard Code: B WGK Germany 3... Read More | Inquire | HIV-1 Tat Protein Peptide is a synthetic peptide that includes the sequence responsible for the cellular uptake of the human immunodeficiency virus-1 Tat protein, consisting of the polycationic region 49-57. The peptide is part of the protein transduction domain (PTD) and was shown to enable the HIV-1 Tat Protein Peptide is a synthetic peptide that includes the sequence responsible for the cellular uptake of the human immunodeficiency virus-1 Tat protein, consisting of the polycationic region 49-57. The peptide is part of the protein transduction domain (PTD) and was shown to enable the introduction of nucleic acids into cells... Read More | Aprotinin is a competitive serine protease inhibitor that inhibits trypsin,chymotrypsin,kallikrein and plasmin.Aprotinin forms stable complexes with and blocks the active sites of enzymes. Binding is reversible with most aprotinin,protease complexes and dissociating at pH >10 or <3. Effective Aprotinin is a competitive serine protease inhibitor that inhibits trypsin,chymotrypsin,kallikrein and plasmin.Aprotinin forms stable complexes with and blocks the active sites of enzymes. Binding is reversible with most aprotinin,protease complexes and dissociating at pH >10 or <3. Effective concentration is equimolar with protease.Recombinant aprotinin is expressed in E. Coli, and purified with HPLC. It contains no animal-derived components. This is a recombinant form of bovine lung aprotinin, which is traditionally isolated from bovine lung by methods involving fractional precipitation, gel filtration, and ion exchange chromatography. UNIT DEFINITION:A conversion factor for Aprotinin is: 1 EPU = 1 USP Aprotinin Unit = 1800 KIU... Read More |