摘要:
A method for storing a tetrazolium compound stably is provided. The tetrazolium compound is stored in the presence of sodium azide. The tetrazolium compound (A) and the sodium azide (B) are present at a ratio (A:B) in the range from 1:0.02 to 1:6.2. Furthermore, when the tetrazolium compound is stored as a solution, the concentration of the sodium azide is in the range from 0.08 to 3.2 mmol/L and the concentration of the tetrazolium compound is in the range from 0.5 to 8 mmol/L. As the tetrazolium compound, it is preferable to use 2-(4-iodophenyl)-3-(2,4-dinitrophenyl)-5-(2,4-disulfophenyl)-2H-tetrazolium salt.
摘要:
Biological assays using various constructions of biochips are disclosed to mirror in vivo situations. The biochip 50 comprises a microchannel 51 having a liquid outlet port 1, bubble release port 2 and a liquid outlet port 3 with an associated bubble release port 4. A multiplicity of tests can be performed often by coating the bore of the microchannel 50 which various adhesion mediating proteins or the use of chemoattractants. The assay assembly 60 comprises a syringe pump feeding the biochip 50. An inverted microscope 65, digital camera 66 and recorder 67 are provided. A sample liquid containing cells in suspension is injected slowly through the biochip and the effect of the assay recorded over a long period.
摘要:
The invention relates to a method for preparing biological samples for analysis, comprising the following steps: (a) the biological sample is placed on a two-dimensional support; (b) application of a protein-precipitating or denaturing first solution L1 to the biological sample at a first temperature T1 for a predetermined first time period Z1; (c) the protein-precipitating or denaturing first solution L1 is then left, or more solution is applied to the biological sample or a protein-precipitating or denaturing second solution L2 is applied to the biological sample at a temperature T2, for a predetermined second time period Z2, whereby T2 is lower than T1 and Z2 is longer, equal to or shorter than Z1; and (d) drying of the sample. The invention also relates to a device for carrying out a method for the preparation of biological samples for analysis, in accordance with one of the aforementioned claims, said device (10) comprising at least one chamber (12) for receiving the biological sample or samples that has/have been applied to at least one support and comprising at least one temperature controller (14) for controlling and adjusting the temperature inside the chamber (12).
摘要:
An apparatus for micromanipulating biological materials, comprising: (a) a laser emitting light at a wavelengthnull600 nm; (b) a matrix supporting the biologic material, comprising a light-absorbing material; and (c) a system for focusing light from the source onto specific regions of the matrix. The light absorbing material absorbs the light and coverts it to heat so as to disrupt the matrix and the biological material at the point where the light contacts the matrix. Preferably, the matrix is supported by a carrier to form a bi-layer matrix composite. In another embodiment, the matrix is supported on a support plate having an aperture which is covered, at least in part, by the matrix. In another embodiment, the a matrix is supported by a carrier, wherein at least one of the matrix and the support plate comprises a cell growth modifier.
摘要:
The present invention relates to a method of identifying calcium binding sites in gamma-crystallin useful in calcium-based homeostasis for the management of Cataract, said method comprising steps of isolating gamma-crystallin from eye lens, studying binding of calcium to the isolated protein by both direct and indirect methods, identifying Greek key Motif as calcium-binding sites of the protein gamma crystallin with the said protein binding 4-mol eq of calcium having dissociation constant of 90micromole.
摘要:
The invention relates to a method for the examination of cells (20, 38) in a culture medium, in particular for in-situ microscopy in a bio-reactor, whereby cells in a sample volume, the depth (d) of which is defined by windows (14, 16) in the direction of the optical axis of the microscope (18), are microscopically imaged and are automatically recorded and processed by means of an image processing system (30). Said method is characterized in that the depth (d) of the sample volume (12) is adjusted to the size of the cells (20, 38) by successively reducing the separation (d) of the windows while the image size (G) of the cells is simultaneously verified by the image processing system (30) such that a separation value (D) is determined at which the image size (G) of the cells begins to grow, thus corresponding to flattening caused by the contact pressure of the windows (14, 16), and that the separation (d) of the windows (14, 16) is set to said separation value (D) for the examination.
摘要:
The invention relates to a method for analyzing cells that are present as closed clusters. According to said method, a planar tissue preparation is subjected to an identification staining of the cell nuclei and a target structure staining of cell objects that is different from the identification staining. Digital images are recorded of the stained tissue preparation by means of an electronic image recording device and at least one image of a subsection of the tissue cut is displayed in at least one coloration. According to the inventive method, at least one parameter of the cell nuclei and at least one parameter of the cell objects labeled by target structure staining is restricted to a predetermined range of values. Cell nuclei and cell objects whose parameters correspond to the respective parameter range(s) are detected and optionally displayed using image processing algorithms in the image of said subsection. The image content of at least one image detected for the cell nuclei is correlated with the image content of at least one image detected for the target-structure stained cell objects to detect the individual cells. On the basis of the cell nuclei identified a cell growth or a cell enlargement is induced using a predetermined arithmetic algorithm to reconstruct the individual cells. In doing so it is made sure that neighboring cells do not fuse. The number of reconstructed individual cells is determined and/or the individual cells are divided into populations according to certain parameters.
摘要:
FORMULATION AND THE RESPECTIVE PRESERVATION PROCESS OF ANIMAL AND VEGETABLE TISSUES, presented in liquid form and that has the particularity of having low basicity and a masking and complexing balanced system, where such characteristics grant to the product a high power of diffusion and distribution in the most internal regions of the hide structure, guaranteeing a fast transformation, and producing leathers with special properties, being able to be used in the processing of any type of hide, and being particularly indicated for bovine leathers of greater thickness (integral), where with the commonly used formulations a rather longer processing time is needed.
摘要:
Transmembrane potential measurement methods using cationic dyes, and anionic dyes are provided. Compositions of the cationic and anionic dyes and microfluidic systems which include the dyes and membranes are provided in conjunction with processing elements for transmembrane potential measurements.
摘要:
The present invention relates to the use of molecular histological signatures to interpret and correlate cytological specimens with the presence or absence of disease and the progression thereof. The invention provides molecular signatures for use in the study and/or diagnosis of diseased cells and tissues of a cytological specimen relative to a solid (e.g. histological) sample.