Dichromate oxidation is a simple technique that is often Ilsed to estimate the energy content of eggs in studies of marine invertebrate life histories (1). We used this method to measure the energy contents af the eggs of 12 species of marine annelids. In combinati on with measures of egg ash­ free dry weight (AFDW), these data yielded estimates of AFDW-specific energy density that were mostly ...

Extending the class of group 6 metal-metal bonded methylate compounds supported by alkali metal counter-ions, the first sodium octamethylmolybdate(ii) complex [(TMEDA)Na]4Mo2Me8 and heptamethylchromate(ii) relations [(donor)Na]3Cr2Me7 (donor is TMEDA or TMCDA) are reported. The former was made by treating [(Et2O)Li]4Mo2Me8 with four equivalents of NaOtBu/TMEDA in ether; whereas the latter resul...

The 3+2 cycloaddition reaction of 1-(4-phenylphenacyl)-1,10-phenanthrolinium ylide 4 with activated alkynes gave pyrrolo[1,2- 4a][1,10]phenanthrolines 6a-d. The "one pot" synthesis of 6a,b,d from 4, activated alkenes, Et(3)N and tetrakis-pyridine cobalt (II) dichromate (TPCD) is described. The helical chirality of pyrrolophenanthrolines 6b-d was put in evidence by NMR spectroscopy.

To each weighted graph F, two invariants, a polynomial Pf(x,y, z) and the signature rj(r), are defined. The various partial degress of Pr(x,y, z) and c(T) are expressed in terms of maximal spanning graphs of T. Furthermore, one unexpected property of Tutte's dichromate is proved. These results are applied to knots or links in S3 .