Now showing items 61-70 of 125
Initiation of mineralization in bioprosthetic heart valves: Studies of alkaline phosphatase activity and its inhibition by AlCl 3 or FeCl 3 preincubations
(John Wiley & Sons, Inc., 1991-08)
The principal cause of the clinical failure of bioprosthetic heart valves fabricated from glutaraldehyde-pretreated porcine aortic valves is calcification. Other prostheses composed of tissue-derived and polymeric biomaterials ...
High-density photoautotrophic algal cultures: Design, construction, and operation of a novel photobioreactor system
(Wiley Subscription Services, Inc., A Wiley Company, 1991-12-05)
A photobioreactor system has been designed, constructed and implemented to achieve high photosynthetic rates in high-density photoautotrophic algal cell suspensions. This unit is designed for efficient oxygen and biomass ...
Electrophysiological actions of VIP in rat somatosensory cortex
(Elsevier, 1991)
Electrophysiological and biochemical studies suggest that VIP may exert a facilitating action in the neocortical local circuitry. In the present study, we examined the actions of VIP and VIP + norepinephrine (NE) on ...
Divergent patterns of incorporation of bromodeoxyuridine and iododeoxyuridine in human colorectal tumor cell lines
(Elsevier, 1991-06-21)
Using a panel of four human colorectal tumor (HCT) cell lines, we have quantitatively characterized the incorporation of bromodeoxyuridine (BrdUrd) and iododeoxyuridine (IdUrd) into DNA, both as individual agents and in ...
Synthesis of a pyrido[1,2-a]purine nucleoside by a novel ring cleavage-annulation reaction of 3-[beta]-D-ribofuranosylimidazo-[4,5-d]--triazin-4-one
(Elsevier, 1991-10-07)
Treatment of 7-(2,3,5-tris--(t-butyldimethylsilyl)-[beta]--ribofuranosyl)imidazo[4,5-]-v-triazin-4-one (1) with MnO2 in hot pyridine furnished 7-(2,3,5-tris--(t-butyldimethylsilyl)-[beta]--ribofuranosyl)pyrido[1,2-a]-purine ...
Elastic analysis of the energy and relaxation of stepped surfaces
(Elsevier, 1991-09-01)
We present an analytical, elastic analysis for the energy and relaxation of stepped surfaces. The analysis is based upon the observation that the most prominent feature of the non-reconstructive surface relaxation consists ...
Plasmids for recombination-based screening
(Elsevier, 1991-09-30)
To facilitate recombination-based screening, we constructed the ColE1-based plasmid, [pi]G4, that confers chloramphenicol resistance, contains a polylinker with multiple unique restriction enzyme recognition sequences, and ...
cDNA cloning of the type 1 neurofibromatosis gene: Complete sequence of the NF1 gene product
(Elsevier, 1991-12)
Von Recklinghausen neurofibromatosis, or type 1 neurofibromatosis (NF1), is a common autosomal dominant disorder characterized by abnormalities in multiple tissues derived from the embryonic neural crest. Portions of the ...
Distribution of D2 dopamine receptor mRNA in the primate brain
(Elsevier, 1991)
1. The distribution of the messenger RNA (mRNA) encoding the D2dopamine receptor has been mapped in the monkey brain by hybridization.2. Using [35s]-labelled riboprobes corresponding to the region of the D2 dopamine ...