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Biomedical subjects

L S Liu

Publications and source records attributed to L S Liu.

At least 91 records · Page 5Linked to original sources
PubMed1984

Relationship between salt excretion and blood pressure in various regions of China.

Overnight urine samples were collected on three consecutive days from 3105 persons in 12 regions of China, and analysed for levels of sodium and potassium. The mean 9-hour overnight urine sodium level ranged from 49.51 to 139.12 mmol, and urine potassium from 6.32 to 18.43 mmol. Univariate regression, simple correlation analysis, and multivariate ridge regression analysis were carried out on the data. A positive correlation between blood pressure and urine sodium or sodium/potassium ratio was found in each of the twelve regions. Urine potassium showed a negative correlation with blood pressure in three regions.

Adult↗
PubMed1982

The Red function of phage lambda mediates the alteration of an interspersed repeated DNA sequence from the kangaroo rat Dipodomys ordii.

The kangaroo rat D. ordii is shown to contain an interspersed repeated sequence 3.25 kb in length. This sequence undergoes alteration (deletions) when cloned into a Red+ lambda vector but is stable in a Red- vector. Using the Red- clone it is shown that deletions are the result of the activity of the lambda Red, or E. coli RecE, recombination systems. Mixed infection experiments demonstrate that this activity is acting in trans. The deletions appear to yield fragments of specific size, suggesting that the recombination system is recognizing a specific sequence. The demonstration of small homologous fragments in the animal genomic DNA suggests that a similar system of recombination may exist in D. ordii.

Animals↗