- Description
- Additional Information
- Readable Documents
- Assay Principle
- Reviews
Introduction
Traditionally, formaldehyde (FA) has been viewed as an environmental hazard and a toxic carcinogen for mammals. However, FA is produced in mammalian cells via enzymatic pathways and used in the “one carbon cycle” to make building blocks for life such as DNA and certain amino acids. This ‘one carbon cycle’ is fundamental to all forms of life down to the bacterial cell (1-6). FA is maintained in homeostasis in living cells, however its breakdown and over production has been implicated in the pathogenesis of various diseases such as cancer, dementia, diabetes and Alzheimer’s disease (7-11).
Cell Technology introduces two ultra-fast reversible probes, developed by Dr. Xin Li et al, PMF and PMF4 for the detection of FA in living cells or aqueous samples (12,13). These quenched fluorogenic probes when exposed to FA become fluorescent: Ex 320-420nm Em: 520-560mm. PMF4 is especially useful in in-situ visualization of FA in cellular lysosomes.
Key Benefits
- Probe PMF: In-situ monitoring of Formaldehyde (FA) in the cytoplam.
- Probe PMF4: In-situ monitoring of Formaldehyde (FA) in lysosomes.
- Study of FA levels in cellular stress, diseases such as Alzhimers and cancer.
- Reversible probe monitoring FA homeostasis in live cells and tissue sections.
- FA detection in Bacterial, fungal and plant cells.
- Environmental samples.
Additional information
| Kit Size | 0.5mg, 2.0mg |
|---|
PMF and PMF4 are quenched fluorogenic probes and when exposed to FA become fluorescent: These probes are extremely useful for continuous in-situ monitoring of FA in live cells or live tissue sections. Ex 320-420nm Em: 520-560mm. PMF4 is especially useful in in-situ visualization of FA in cellular lysosomes.
Reaction:
1. PMF/PMF4 Non-Fluorescent Dye + Formaldehyde → Fluorescent Analog
Excitation: 320-420nm and Emission at 520-560nm. Flow Cytometery /Fluorescent Microscope Ex:488 Em: 520-560nm.
Figure. Photophysical responses of PFM to FA. (A) PFM (20 μM) was treated with various amounts of FA for 5 min, and then the UV−vis spectra were recorded. (B) Fluorescent spectra of PFM (10 μM) after the treatment of various concentrations of FA for 5 min. (C) Reaction time course of PFM (10 μM) with FA (10, 100, 200, 400 μM). (D) Fluorescent responses of PFM (10 μM) toward various analytes (300 μM) after a reaction time of 30 min without (black) or with (red) the presence of FA (300 μM). The analytes tested were PFM blank (1), acetaldehyde (2), malonaldehyde (3), ascorbic acid (4), glucose (5), glucosone (6), oxalic acid (7), pyruvate (8), methylglyoxal (9), glyoxal (10), p-methoxybenzaldehyde (11), trichloroacetaldehyde (12), p-nitrobenzaldehyde (13), acetone (14), HClO (15), H2O2 (16), GSH (17). For C and D, F represents the fluorescent intensity of PFM at 500 nm after the treatment of FA for various time or after the treatment of various analytes, and F0 represents the intensity of blank PFM solution at 500 nm. All data were collected in PBS (pH 7.4, 10 mM) at ambient temperature with λex 451 nm.
| Reference |
| Yu PH, Wright S, Fan EH, Lun ZR, Gubisne-Harberle D. Physiological and pathological implications of semicarbazide-sensitive amine oxidase. Biochim Biophys Acta. 2003; 1647: 193-9. |
| O"Sullivan J, Unzeta M, Healy J, O"Sullivan MI, Davey G, Tipton KF. Semicarbazide-sensitive amine oxidases: enzymes with quite a lot to do. Neurotoxicology. 2004; 25: 303-15 |
| Lee ES, Chen H, Hardman C, Simm A, Charlton C. Excessive S-adenosyl-L-methionine-dependent methylation increases levels of methanol, formaldehyde and formic acid in rat brain striatal homogenates: possible role in S-adenosyl-L-methionine-induced Parkinson"s disease-like disorders. Life Sci. 2008; 83: 821-7. |
| Shi Y, Lan F, Matson C, Mulligan P, Whetstine JR, Cole PA, Casero RA, Shi Y. Histone demethylation mediated by the nuclear amine oxidase homolog LSD1. Cell 2004; 119: 941-53. |
| WangY, ZhangH, ChenY, SunY, YangF, YuW,LiangJ, SunL, YangX, ShiL, Li R, Li Y, Zhang Y, Li Q, Yi X, Shang Y. LSD1 is a subunit of the NuRD complex and targets the metastasis programs in breast cancer. Cell 2009; 138: 660-72. 6. Guillermo Burgos-Barragan, Niek Wit, Johannes Meiser, Felix A. Dingler, Matthias Pietzke, Lee Mulderrig, Lucas B. Pontel, Ivan V. Rosado, Thomas F. Brewer, Rebecca L. Cordell, Paul S. Monks, Christopher J. Chang, Alexei Vazquez, Ketan J. Patel. Mammals divert endogenous genotoxic formaldehyde into one-carbon metabolism. Nature, 2017; |
| A. R. Hipkiss, Aging Dis., 2017, 8, 128–130. |
| R. Baan, Y. Grosse, K. Straif, B. Secretan, F. El Ghissassi, V. Bouvard, L. Benbrahim-Tallaa, N. Guha, C. Freeman, L. Galichet, V. Cogliano and W. H. O. I. A. f. R. o. C. M. W. Group, Lancet Oncol., 2009, 10, 1143–1144. |
| J. D. Rizak, Y. Ma and X. Hu, Curr. Alzheimer Res., 2014, 11, 461–468. 20 J. Lu, J. Miao, T. Su, Y. Liu and R. He, Biochim. Biophys. Acta, 2013, 1830, 4102–4116. |
| T. Jiang, Q. Sun and S. Chen, Prog. Neurobiol., 2016, 147, 1–19. |
| A. Rahmadi, N. Steiner and G. Munch, Clin. Chem. Lab. Med., 2011. |
| Xing-Guang Liang, Bo Chen, Ling-Xiao Shao, Juan Cheng, Ming-Zhu Huang, Yu Chen, Yong-Zhou Hu, Yi-Feng Han, Feng Han and Xin Li.A Fluorogenic Probe for Ultrafast and Reversible Detection of Formaldehyde in Neurovascular Tissues. Theranostics, 2017:7(8): 2305-2313. doi: 10.7150/thno.19554 |
| Part# | Reagent | Temperature |
| 4029 | PMF: 1 vial | -20°C |
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还不错，希望你采纳。
通过测量两次重量，直接数字显示密度值，自动得出密度结果，省去人工计算。
选橡胶密度计，还需要看橡胶密度计的质量，精度，专业性等多方面来考量。
希望你能选到满意的橡胶密度计，如有问题可咨询仪特诺，也可继续追问我。
百度搜索：上海劳瑞仪器设备
各位大侠：
颗粒筛分及检测堆实密度的意义何在？检测堆实密度时的振荡次数一般是多少？是统一规定的还是各国有各自的要求？
请不吝赐教！！！小弟在此先抱拳谢过。。。
特别处理：在底端，用合适力度的平衡弹簧，拉住磁浮子；
使用方式：被测液体要完全浸没磁浮子；
测量原理：液体密度与产生的浮力成正比，浮力会正比于磁浮子移动距离；
准确测出磁浮子位置，就可以得到密度了。
实在需要我可以画个图示意下，但是原理就这样，很简单！
