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Biomedical subjects

D Liu

Publications and source records attributed to D Liu.

At least 847 records · Page 47Linked to original sources
PubMed1983

Lower eyelid laxity and ocular symptoms.

We measured lower eyelid length in 288 healthy subjects to establish a norm and then in 95 patients with complaints of intractable photophobia, foreign-body sensation, chronic tearing, or chronic recurrent conjunctivitis. The difference in length was statistically significant (34.25 +/- 2.43 mm for healthy men vs 36.51 +/- 2.59 mm in male patients [P - .001] and 32.97 +/- 2.46 mm for healthy women vs 33.95 +/- 2.9 mm for female patients [P = .01]). There appears to be a cause-and-effect relationship between a flaccid lower eyelid and these ocular symptoms.

Aged↗
PubMed1983

Effects of divalent cations and sulfhydryl reagents on the p-aminohippurate (PAH) transporter of renal basal-lateral membranes.

A specific system of transport for p-aminohippurate (PAH) is demonstrated in rabbit renal basal-lateral membrane vesicles. The PAH uptake into an intravesicular space is inhibited by probenecid in concentrations above 0.2 mM. The transport is saturable and is also temperature-dependent with an optimum between 37 and 45 degrees C. Divalent cations are able to enhance the uptake 2- to 3-fold. The stimulatory effect of the divalent cations diminishes in the following order: Mg++ = Mn++, Ba++, Ca++ and Sr++. Maximum stimulation occurs between 2.5 and 5 mM Mg++. The divalent cation stimulatory effect is not the result of changes in the size of the vesicles, in the degree of vesiculation, in the net charge of the membrane or of a transient potential difference across the membrane. Several inhibitors, more inhibitory than probenecid, were found. These are: lithium diiodosalicylate; 4-acetamido-4'-isothiocyano 2,2'-disulfonic acid stilbene; the mercurials, mersalyl acid, p-chloromercuriphenyl sulfonate and Hg++; and 5,5'-dithiobis(nitrobenzoate). Among these, mersalyl acid is the most potent inhibitor for PAH uptake. Its inhibitory effect is probably a combination of its reactivity toward sulfhydryl groups and its anionic character. The results with sulfhydryl reagents indicate that the PAH transport system contains sulfhydryl groups which are essential for the uptake activity. These sulfhydryl groups are probably buried in a hydrophobic region within the lipoprotein matrix of the basal-lateral membrane.

4-Acetamido-4'-isothiocyanatostilbene-2,2'-disulfo↗
PubMed1983

A new technique of threading fascia lata strip.

By using disposable needles, we have developed a new technique of threading the fascia lata strip through the stripper or through the eye of a needle. The technique is simple, effective, and needs no special instruments.

Blepharoptosis↗
PubMed1982

Basal-lateral membranes from rabbit renal cortex prepared on a large scale in a zonal rotor.

Basal-lateral membranes from the renal cortex of the rabbit were isolated by sucrose gradient centrifugation in a zonal rotor which allows for a large-scale preparation of these membranes. A heterogeneous population of membranes (P4) which contained 29% of the (Na+ + K+)-ATPase found in the homogenate of renal cortex was prepared by differential centrifugation. When pellet P4 was subjected to centrifugation in a sucrose gradient the activity of (Na+ + K+)-ATPase, a marker for basal-lateral membranes, could be separated from enzymatic markers of other organelles. The specific activity of (Na+ + K+)-ATPase was enriched 12-fold at a density of 1.141 g/cm3. Membranes (P alpha) contained in the (Na+ + K+)-ATPase-rich fractions consisted primarily of closed vesicles which exhibited probenecid inhibitable transport of rho-aminohippurate. These membranes did not exhibit Na+-dependent, phlorizin-inhibitable D-glucose transport. Sodium dodecyl sulfate polyacrylamide gel electrophoresis of proteins from P alpha revealed at least six major protein bands with molecular weights of 91000, 81000, 73000, 65000, 47000 and 38000. A small fraction of total alkaline phosphatase found in the homogenate was found in pellet P4. Membranes containing this alkaline phosphatase activity were distributed widely over the gradient, with peak activity found at a density of 1.141 g/cm3. In contrast, when brush borders were subjected to gradient centrifugation under the same conditions as P4, alkaline phosphatase was found in a narrow distribution, with peak activity at a density of 1.158 g/cm3. The principle subcellular localization of the alkaline phosphatase found in P4 could not be determined unambiguously from the data, but the activity did not seem to be primarily associated with classical brush borders.

Alkaline Phosphatase↗
PubMed1981

Iatrogenic hyponatraemia of the newborn due to maternal fluid overload: a prospective study.

Over five weeks 136 out of 246 deliveries were studied. Maternal plasma sodium concentrations were normal at admission. At delivery no significant difference was found between maternal and infant cord plasma sodium concentrations. Twenty-four of the 41 mothers who had received only oral fluids during labour had infants whose cord plasma sodium concentrations were normal. Of the 95 mothers who had been given intravenous fluids, however, only 14 infants with normal plasma sodium concentrations, 31 had a concentrations of 130 mmol (mEq)/1 or less and nine of these had a concentration of 125 mmol/1 or less. There was a highly significant inverse relation between cord plasma sodium concentration and rate of fluid administration, suggesting that hyponatraemia was due to intravenous treatment with predominantly sodium-free solutions. Endogenous antidiuretic activity probably increases during labour, and synthetic oxytocin in large doses has been shown to have an antidiuretic effect. The dose used in this study did not appear to have such an effect. Glucose solutions are often used as a vehicle for oxytocin; 83% of all fluid intake in this study was 5% or 10% glucose in water. Fluid balance in labour should be supervised closely, and oxytocin should be given in a more concentrated solution.

Birth Weight↗