scholarly journals Determination of dielectric properties of a high-molecular weight DNA

Biopolymers ◽  
1978 ◽  
Vol 17 (9) ◽  
pp. 2279-2283 ◽  
Author(s):  
A. Surowiec
Keyword(s):  
Molecular Weight ◽  
Dielectric Properties ◽  
High Molecular Weight ◽  
High Molecular Weight Dna

Isolation of high molecular weight DNA from wholeEuglena cells

PROTOPLASMA ◽  
1987 ◽  
Vol 141 (2-3) ◽  
pp. 139-148 ◽  
Author(s):  
Christine Mederic ◽  
Odile Bertaux ◽  
J. D. Rouzeau ◽  
R. Valencia
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
High Molecular Weight Dna

A general method of isolating high molecular weight DNA from methanogenic archaea (archaebacteria)

1992 ◽  
Vol 38 (1) ◽  
pp. 65-68 ◽  
Author(s):  
Ken F. Jarrell ◽  
David Faguy ◽  
Anne M. Hebert ◽  
Martin L. Kalmokoff
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Thermal Denaturation ◽  
Dna Isolation ◽  
Methanogenic Archaea ◽  
Restriction Enzymes ◽  
Mole Percent ◽  
High Molecular Weight Dna ◽  
Isolation Methods ◽  
General Method

High molecular weight DNA was readily isolated from all methanogens treated, as well as from thermophilic anaerobic eubacteria, by grinding cells frozen in liquid N2, prior to lysis with SDS. DNA can subsequently be purified by the usual phenol–chloroform extractions. The procedure yields DNA readily cut by restriction enzymes and suitable for oligonucleotide probing, as well as for mole percent G + C content determination by thermal denaturation. The method routinely yields DNA of high molecular weight and is an improvement over DNA isolation methods for many methanogens, which often involve an initial breakage of the cells in a French pressure cell. Key words: methanogens, archaebacteria, archaea, DNA isolation.

Role of proteolysis in apoptosis: involvement of serine proteases in internucleosomal DNA fragmentation in immature thymocytes

1993 ◽  
Vol 71 (9-10) ◽  
pp. 488-500 ◽  
Author(s):  
Valerie M. Weaver ◽  
Boleslaw Lach ◽  
P. Roy Walker ◽  
Marianna Sikorska
Keyword(s):  
Molecular Weight ◽  
Serine Protease ◽  
High Molecular Weight ◽  
Protease Inhibitors ◽  
Dna Fragmentation ◽  
Dna Cleavage ◽  
Apoptotic Cell ◽  
Dependent Manner ◽  
Serine Protease Inhibitors ◽  
High Molecular Weight Dna

Three chemically distinct serine, but not cysteine, protease inhibitors (phenylmethylsulphonyl fluoride, N-tosyl-L-phenylalanylchloromethyl ketone and 3,4-dichloroisocoumarin) prevented, in a dose-dependent manner, the characteristic apoptotic internucleosomal DNA cleavage (DNA ladder) typically observed in thymocytes in response to dexamethasone and teniposide VM-26. This effect was not the result of a direct inhibition of the Ca2+, Mg2+-dependent endonuclease, since oligonucleosomal DNA cleavage occurred in the presence of these inhibitors in isolated nuclei. The proteolytic step occurred at a very early stage of apoptosis, and preincubation of thymocytes with the inhibitors before dexamethasone or teniposide VM-26 were added irreversibly suppressed ladder formation. This implied that the cellular effector(s) of these compounds preexisted and were not resynthesized in response to the inducers of apoptosis. Serine protease inhibitors also suppressed apoptotic cell shrinkage and complete nuclear collapse, suggesting that these morphological changes were directly related to internucleosomal fragmentation of DNA. However, the serine protease inhibitors did not prevent high molecular weight DNA cleavage (> 50 kilobases) that preceded the ladder formation and thymocytes still died by apoptosis. This supported the view that internucleosomal DNA cleavage, considered to be the biochemical marker of apoptosis, might in fact be a late and dispensable step and that the newly described high molecular weight DNA cleavage might be a better indicator of apoptosis.Key words: serine protease, apoptosis, internucleosomal DNA fragmentation, high molecular weight DNA cleavage, protease inhibitors.

Extracting high molecular weight DNA from Halichondria panicea (Phylum: Porifera) v1

2019 ◽  
Author(s):  
Rasmus Dam Wollenberg ◽  
Brian Strehlow ◽  
Astrid Schuster
Keyword(s):  
Molecular Weight ◽  
Molecular Biology ◽  
High Molecular Weight ◽  
High Molecular Weight Dna ◽  
Halichondria Panicea

This protocol was used to extract high molecular weight DNA from the sponge (porifera) Halichondria panicea. This protocol contains slight modifications from that presented in Ausubel et al (1995). References: Ausubel, F.; Brent, R.; Kingston, R.; Moore, D.; Seidman, J.G.; Smith, J.;Struhl, K. Short Protocols in Molecular Biology(1995), 3rd ed., Unit 2.1: page 2-3

scholarly journals Effects of Delayed Sample Processing on Determination of Total and High Molecular Weight (HMW) Adiponectin in Serum and Plasma: A Pilot Study

2016 ◽  
Vol 8 (3) ◽  
pp. 19
Author(s):  
Choaping Ng ◽  
Felicity J Rose ◽  
Sahar Keshvari ◽  
Marina M Reeves ◽  
Goce Dimeski ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Pilot Study ◽  
High Molecular Weight ◽  
Accurate Determination ◽  
Mean Difference ◽  
Serum Samples ◽  
Blood Samples ◽  
Hmw Adiponectin ◽  
Total Adiponectin

<p>Adiponectin is a beneficial adipocyte-secreted hormone, which circulates in a variety of multimeric forms termed low and high molecular weight (LMW/HMW). Effectiveness of clinical therapeutic trials which target adiponectin rely on accurate determination of circulating total and HMW adiponectin levels but the accuracy may be influenced by variations in sample handling processes. The aim of this pilot study was to investigate the effects of delayed processing of blood samples on the concentration of total and HMW adiponectin.</p><p>Materials and Methods: Fasting blood samples were collected for analysis of total and HMW adiponectin concentrations in EDTA plasma and serum from eight healthy participants.  Samples were centrifuged post 15 min storage at 4<sup>o</sup>C as the comparative ‘ideal’ method or after up to 72 h of refrigerated storage or 6 h at room temperature. Total and HMW adiponectin concentrations were measured by ELISA.</p><p>Results: Under ideal handling conditions measurements of total and HMW adiponectin concentrations were significantly higher in serum than in plasma (mean difference: -1.3 µg/mL [95% CI: -1.6, -1.0], p&lt;0.001; and, -0.6 µg/mL [95% CI: -0.7, -0.5], p&lt;0.001, respectively).  Storage of blood samples at 4<sup>o</sup>C for 72 h resulted in significant reductions in concentration of total adiponectin in serum (mean difference: -1.4 µg/mL [95% CI: -2.0, -0.8], p=0.001) and HMW adiponectin in plasma (mean difference: -0.6 µg/mL [95%CI: -0.9, -0.2], p=0.007), compared with ideal conditions.  Further analysis of serum samples showed a significant decrease in total adiponectin concentration after 6 h storage at 4<sup>o</sup>C (mean difference: -1.4 µg/mL [95% CI: -2.0, -0.8], p=0.001) compared with ideal conditions.</p><p>Conclusions: Delayed processing of samples may have differential effects on the concentration of total and HMW adiponectin in serum or plasma. Larger studies are warranted for clinical intervention trials.</p>

scholarly journals The photocarcinogenicity of anthracence: photochemical binding to deoxyribonucleic acid in tissue culture

1975 ◽  
Vol 149 (1) ◽  
pp. 289-291 ◽  
Author(s):  
G M Blackburn ◽  
P E Taussig
Keyword(s):  
Molecular Weight ◽  
Tissue Culture ◽  
High Molecular Weight ◽  
Deoxyribonucleic Acid ◽  
Radiation Doses ◽  
Mammalian Tissue ◽  
Hydrocarbon Molecule ◽  
High Radiation ◽  
High Molecular Weight Dna ◽  
Low Radiation Doses

Anthracene becomes covalently bound to high-molecular-weight DNA in mammalian tissue culture as a result of irradiation at 365 nm after the incubation of cells with the hydrocarbon. At high radiation doses, the extent of binding exceeds one hydrocarbon molecule per 103 bases, and is lethal. At low radiation doses, much decreased binding is observed, but a majority of cells remain viable and can be recultured.

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