The extracellular hemoglobin of the earthworm Lumbricus terrestris has a two-tiered hexagonal structure that can be dissociated into 1/12 subunits. The Hb contains four major kinds of oxygen-binding chains, a, b, c, and d, of which a-c form a disulfide-linked trimer. Additional non-heme chains are necessary for the assembly of the intact 3800-kDa molecule of approximately 200 subunits. Oxygen e...

the transfer and sedimentation in storage dams reduce the volume and damage the life of water reservoirs. due to the importance of water, its storage, and the cost time of constructing reservoirs, especially the scarcity of construncting sites for them, a lot of attentions should be given to the sedimentation of dam reservoirs. it requires the estimate of thew sedimentation and its management. ...

The continental margin is a key area for studying the sedimentary processes related to advance and retreat of Ross Ice Shelf (Antarctica); nevertheless, much remains be investigated. aim this study increase knowledge last glacial/deglacial dynamics in Central Basin slope–basin system using multidisciplinary approach, including integrated sedimentological, micropaleontological tephrochronologica...

Superhelical PM2 DNA I can be modified with N-cyclohexyl-N'-beta-(4-methylmorpholinium)ethyl carbodiimide (CMC). The transition of the sedimentation coefficient uncorrected for buoyant density change (S20,*) vs. % reactivity in terms of base pairs shows the following characteristics. The S20,* increases by 4.5 S units upon 1% modification. There is a plateau in S20,* between 1 and 4% reactivity...

Conventional magnetic stratigraphy was not possible due to the young age (<780 ka) of the recovered sediments. Taking advantage of the exceptionally high sedimentation rates, however, we were able to successfully adopt several other less-utilized magnetostratigraphic techniques. Foremost among these was the identification of short periods of anomalous geomagnetic polarity (i.e., events and excu...

Gerwing, Julia (The University of British Columbia, Vancouver, Canada), Claude E. Dolman, and David A. Arnott. Activation phenomenon of Clostridium botulinum type E toxin. J. Bacteriol. 84:302-306. 1962-Highly purified preparations of both nonactivated and trypsin-activated type E botulinus toxins have been analyzed in an ultracentrifuge. Untreated botulinus type E toxin was found to have a sed...

PECIFIC pairing of complementary strands was proposed by MARMUR and LANE (1960) and DOTY, MARMUR, EIGNER and SCHILDKRAUT (1960) as the mechanism of renaturation of DNA. Later, sedimentation studies of renatured mixtures of isotopically light and heavy strands ( SCHILDKRAUT, MARMUR and DOTY 1961; ROWND 1963), reenforced their case. In a test of this mechanism, HERRIOTT (1961a) annealed a mixture...

The cell culture method originally devised the total pool of human CFU-E in that they by Stephenson and Axelrad for erythrohave a slower mean sedimentation velocpoietin-dependent erythropoietic colony ity and a greater erythropoietin requireformation (CFU-E) by mouse cells has been ment. The assay is quantitative and was adapted to human marrow. Erythropoietic used to determine the radiation se...