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N Jacobsen

Publications and source records attributed to N Jacobsen.

158 records · Page 9Linked to original sources
PubMedDate not supplied

Photochemical immobilization of anthraquinone conjugated oligonucleotides and PCR amplicons on solid surfaces.

Ligand immobilization on solid surfaces is an essential step in fields such as diagnostics, bio sensor manufacturing, and new material sciences in general. In this paper a photochemical approach based on anthraquinone as the chromophore is presented. Photochemical procedures offer special advantages as they are able to generate highly reactive species in an orientation specific manner. As presented here, anthraquinone (AQ) mediated covalent DNA immobilization appears to be superior to currently known procedures. A synthetic procedure providing AQ-phosphoramidites is presented. These reagents facilitate AQ conjugation during routine DNA synthesis, thus enabling the AQ-oligonucleotides to be immobilized in a very convenient and efficient manner. AQ-conjugated PCR primers can be used directly in PCR. When the PCR is performed in solution, the amplicons can be immobilized after the PCR. Moreover, when the primers are immobilized prior to the PCR, a solid-phase PCR can be performed and the amplicons are thus produced directly on the solid support.

Anthraquinones↗
PubMedDate not supplied

Clinical performance of intrauterine devices in nulligravidae: is the length of the endometrial cavity of significance?

In a double-blind study 236 nulligravidae were randomized to insertion of standard models of two commonly used intrauterine devices, Multiload and Gravigard, or shorter versions of these devices. Before insertion the total axial uterine length and the length of the endometrial cavity were determined. After 12 months the total continuation rate was 57.2%. The clinical performance of Multiload models was not statistically different from that of the Gravigards, and the short IUD-types did not do better than the longer ones. Among the longer models a significant higher continuation rate was observed with the Multiload. The frequency of side effects was not increased when the total uterine cavity length was less than 7 cm. As the incidence of side effects was higher than normally reported after insertion of IUD's in parous women it is concluded that insertion of IUD's in nulligravidae should be performed only when other methods of contraception are unacceptable. The ratio between the lengyh of the uterine cavity and the length of the IUD seems to be of no significance for the clinical events following insertion of IUD's in nulligravidae.

Adolescent↗