from dust to stars studies of the formation and early evolution of stars

... investigation of the developments and scientific milestones that led to the pursuit of modern star formation studies. 2.1.1 From Ptolemy to Newton It took humankind until the dawn of the New Age to put ... attempt is made to relate the early history of our Sun and the Solar System to the current knowledge of star formation and early evolutio...

Ngày tải lên: 03/07/2014, 21:09

... stereo- chemistry and degree of folding of the species formed. Thus, to understand the reaction pathways followed by Zn-MT and apo-MT species in the presence of Hg(II), the e ffect of each of the previous ... this, there is a minor effect of t and X at the b eginning and end o f the titration. Thus, the addition of the first 4–6 of Hg(II) to apo-MT...

Ngày tải lên: 16/03/2014, 18:20

... iden- tified as the major and the minor forms of the holo- ACP structure, on the basis of their percentage contri- butions (65% and 35%, respectively) to the overall structure of the protein. The structures ... estimated on the basis of the linear regression of the fraction number of the molecular mass markers cytochrome c (CyC), carbonic anhydrase (CA),...

Ngày tải lên: 16/03/2014, 10:20

... excised from the vector and the inserts were sequenced using standard laboratory protocols. The sequence data w ere analysed using the EXPASY (Expert Protein Analysis System) server of the Swiss ... superfam ily and consist of t wo diff erent subunits. The similarity of these latter sequences to propi- onate CoA-tansferase was lower (23±28%) and restricted to th...

Ngày tải lên: 17/03/2014, 17:20

... activity of the peptides. A better under- standing of the mode of action of these peptides is crucial for the development of a new generation of antibiotics. It is known that, in the absence of both ... each strand between the two bridges – five in the N-terminal strand and three in the C-terminal strand. This causes a greater twist in the b-sheet of androcton...

Ngày tải lên: 22/03/2014, 21:20

... repre- sents the concentration of the enzyme, and k p and k n represent the first-order rate constants for the release of p-nitroaniline from the substrate in the presence and absence of the enzyme, ... sin- gle cell. They are usually composed of several domains; one is common to the members of each family and specifies the family to which that PPIase b...

Ngày tải lên: 23/03/2014, 13:20

... of the section on page 8) of Lowcr Volgian age; and an Upper IIartzfjdd Sandstone, of early Cretaceolis date, comprising the remainder of the formation. In south-western Jameson Land the ... characteristic ol Tollia. In fact, the ornament of most of the examples of Praetollia rnaynci, the type species, is like that of the inner whorls of Tolli...

Ngày tải lên: 17/02/2014, 20:20

... the full gift amount. According to the CRA, if the value of the advantage does not exceed the lesser of 10% of the value of the gift and $75, then the value of the advantage is considered to ... for the purchase of an auction item? Yes, but only if the bid amount exceeds the value of the item by 20%. The amount of the receipt is equal to...

Ngày tải lên: 19/02/2014, 03:20

... in the biosynthesis of these structures and may lead to the discovery of potential therapeutic targets. In addition, the correlation of carbohydrate structure with gene complement will aid in the ... with the previous observation in the linkage analysis that the 6-O-Me-Hep was a terminal unit. The fragment ion at 382 arose from the loss of both the 6-O-Me-Hep...

Ngày tải lên: 21/02/2014, 01:21

... enormously both to the value of the country and to its attractiveness. To refer again to these tales; the description of Rip Van Winkle's ride through the desert, the sand-storm, the huge salt ... into the open country, past the huge flat-topped mountains of Ombokoro, the fastness of the Berg Damaras, thence following the dry river-bed of the...

Ngày tải lên: 06/03/2014, 03:21