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Mib 5

Manufactured by Agilent Technologies
Sourced in Denmark

The MIB-5 is a laboratory instrument designed for the analysis of trace-level contaminants in various sample matrices. It utilizes a multi-dimensional ion mobility spectrometry (MIB) technique to separate and detect a wide range of analytes. The core function of the MIB-5 is to provide highly sensitive and selective analytical capabilities for the identification and quantification of target compounds in complex samples.

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5 protocols using mib 5

1

Immunohistochemical Ki67 Staining

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Paraffin sections of the urinary bladder were IHC stained by anti-Ki67 (1/25, monoclonal, MIB-5, Dako, Glostrup, Denmark) antibodies. Antibodies were applied on paraffin-embedded sections with 20-min heat-induced epitope retrieval in Dako Target Retrieval Solution, citrate pH 6, and 30-min incubation at room temperature with the primary antibody. Combination of biotinylated rabbit anti-mouse immunoglobulins (Dako, code No. E0464) diluted 1:50, and streptavidin/HRP, diluted 1:300, was used for visualization using DAB+ (DakoCytomation) as chromogen.
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2

Immunohistochemical Analysis of Thyroid Tissue

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The resected thyroid glands were fixed in 20% buffered formalin and then embedded in paraffin blocks to cut sections for immunohistochemistry. Deparaffinized 4-μm sections were pre-treated by autoclaving for 20 min at 120°C in target retrieval solution (pH 6.0) (Dako, Glostrup, Denmark). The sections were incubated for 1 h at 37°C with 1:50 dilution of anti-Ki-67 mouse monoclonal antibody (MIB-5, Dako) or 1:200 dilution of anti-p21 mouse monoclonal antibody (CP74, Abcam, Cambridge, UK) in a humidified chamber. After incubation with EnVision+ system-HRP-labeled polymer anti-mouse (Dako) for 60 min, immunoreactivity was visualized by incubation with 3,3-diaminobenzidine (DAB) using a liquid DAB+ substrate chromogen system (Dako). The number of Ki-67-positive cells in thyroid follicular cells was counted as the Ki-67 labeling index (LI; the number of positive cells per one high-power field). The level of p21 immunoreactivity in thyroid follicular cells was assessed by scoring the highest intensity of staining in one high-power field as follows: negative, 0; faint nuclear staining, 1; moderate nuclear staining, 2; intense nuclear and cytoplasmic staining, 3.
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3

Quantifying Hepatocyte Proliferation via Ki-67 Immunostaining

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In assessing hepatocyte proliferation, liver tissues from the hepatic lobes were immune stained with anti-Ki-67 antibodies (monoclonal mouse anti-human Ki-67 antigen; MIB-5; Dako, Carpinteria, California), which detects all active parts of the cell cycle and has a strong positive correlation with proliferating antigen expression, bromodeoxyuridine incorporation, and thymidine incorporation 12 (link). The immune stained sections were counterstained with hematoxylin. Ki-67-positive cells were counted in six medium-power fields (x200 magnification) per section. The proliferation index was defined as the percentage of Ki-67-positive hepatocytes per total hepatocyte count in the field of view. The criteria of nuclear labeling index for Ki67 in this study were as follows: four degrees of positive nuclei for Ki67 were identified: negative if <24%, weak positive (+) if 25-%50%, moderately positive (++) if 51%-74%, strongly positive (+++) if the total score was greater than or equal to 75%.
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4

Immunohistochemical Analysis of Cerebral Tissue

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Five μm histological sections of formalin-fixed, paraffin-embedded cerebrum tissue were placed on polylysine-coated glass slides. Tissue sections were deparaffinized in xylene after overnight packing at 65°C and rehydrated in alcohol descending grades. Endogenous peroxidase activity was removed by incubation of tissue sections in 3% H 2 O 2 for 10 minutes at room temperature. The tissue sections were placed in digested media composed of 0.05 % trypsin (pH 7.8) for 15 minutes at 37°C and incubated with the primary antibody of Glial fibrillary acidic protein GFAP, the primary antibody against proliferating cell nuclear antigen PCNA and amyloid-β (DAKO, clone MIB5, 1:50, mouse) at 1:50 overnight at 4°C. After washing, the slides were incubated at room temperature with secondary biotin linked anti-mouse antibody for 50 minutes, and with the streptavidin-peroxidase complex for 50 minutes, then washed and incubated with developing solution (diaminobenzidine-hydrogen peroxide; DAKO), and counterstained with hematoxylin. As a result of the immune reaction, brown cytoplasmic or nuclear labeling counterstained with hematoxylin was visualized. Incubated sections with 1% nonimmune serum phosphate buffer solution (PBS), the solution used as negative controls. The sections were examined by using a bright-field light Olympus microscope with a digital canon camera.
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5

Immunohistochemical Detection of Ki-67

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Paraffin sections from specimens of the ovaries were stained immunohistochemically to detect Ki67 expression using a monoclonal anti-rat Ki-67 antibody at a dilution of 1/20 according to the guidelines supplied by the manufacturer (Clone MIB-5, Dako, Glostrup, Denmark).
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