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Biomedical subjects

Y F Zhang

Publications and source records attributed to Y F Zhang.

At least 73 records · Page 4Linked to original sources
PubMed1990

[Immunopathological factors influencing the prognosis after resection of lung cancer].

118 surgical specimens were obtained from patients with lung cancer treated in our hospital during the period of 1977-1983 and tested with carcinoembryonic antigen (CEA), ABO (H) isoantigen and Concanavalin A (ConA). The results showed that the CEA assessment, which give no prognostic significance for long-term survival (P greater than 0.05), would be useful in predicting short-term (6 month) out come (P less than 0.05). All patients with positive ABO (H) test for squamous cell lung carcinoma survived at the end of five years. As for ConA, no definite link has been found with the prognosis.

ABO Blood-Group System↗
PubMed1990

[Alterations of the sympathetic activity, plasma catecholamine content and pulmonary surfactant in neurogenic pulmonary edema in rats].

Neurogenic pulmonary edema (NPE) was induced by microinjection of kainic acid into bilateral preoptic area (POA) of the hypothalamus in rats. Sympathetic discharge of the left adrenal branch was recorded, plasma catecholamine (CA) was assayed and the physical properties of pulmonary surfactant (PS) of the lung lavage were measured. The results showed that some physical properties of PS were changed in NPE, i.e. maximal surface tension (gamma Max) decreased, minimum surface tension (gamma Min) increased, recruitment index (RI), stability index and area of hysteresis loop (H-area) decreased. After injection of kainic acid into POA, the sympathetic discharge increased by 22.8 +/- 7.20% and 32.2 +/- 8.0% respectively at 30 and 60 min after injection and paralleled by a marked elevation of plasma catecholamine (CA). The results showed that PS activity had decreased at an early stage of NPE and the change of the plasma CA level was parallel to that of sympathetic discharge. It is suggested that generation of NPE may be related to some disorder of the autonomic nervous system at the level of hypothalamus, increase of sympathetic discharge, elevation of plasma CA level and fall of PS activity.

Animals↗
PubMed1989

The use of nickel-titanium alloy in orthopedic surgery in China.

A new biomaterial made of nickel and titanium with its shape-memory characteristics has been manufactured, investigated, and used in Shanghai, China. Since 1981, this biomaterial has been used in 265 cases clinically, among which 71 involved orthopedic surgery. Results are satisfactory without failure in our short-term follow up. This preliminary report of the use of this new biomaterial with the unique characteristic of being able to recover to its original shape with particular transformation temperatures indicates its potential for opening a new field for investigation in surgery. Research to discover appropriate ratios of nickel and titanium for specific usage is underway. The interest and cooperation between the medical and engineering professions may eventually solve the problems through mutual efforts and result in improved shape-memory biomaterials.

Alloys↗
PubMed1988

The herpes simplex virus latency-associated transcript is spliced during the latent phase of infection.

The herpes simplex virus type 1 latency-associated transcript (LAT) is expressed as a major species 2,100 to 2,200 bases in length and a less abundant one ca. 730 bases shorter in latently infected mouse and rabbit neurons. RNA blot hybridization experiments using 20- to 22-base synthetic oligonucleotides and mung bean nuclease protection assays have demonstrated that the smaller LAT species is colinear with the larger one, except for a 730-base intron. On the basis of Northern blot analysis, the spliced species which comprises as much as 50% of the total LAT in latent infections of mice with several strains of herpes simplex virus type 1 and latent infections of rabbits with either the McKrae or the KOS(M) strains of virus is not present in the acute phase of infection. Further and rather surprisingly, in mice latently infected with the KOS(M) strain of virus, the spliced LAT species is considerably less abundant. This suggests that both the strain of virus and the animal in which the latent infection occurs are important in either the processing or stability of spliced LAT. Finally, an exhaustive series of experiments failed to provide convincing evidence that a unique, poly(A)+ species of LAT exists in the latent phase of infection.

Acute Disease↗
PubMed1988

Physical characterization of the herpes simplex virus latency-associated transcript in neurons.

RNA transfer (Northern) blot analysis was used to perform the physical characterization of the transcript expressed in murine sensory nerve ganglia latently infected with herpes simplex virus type 1. Most of this latency-associated transcript (LAT) was isolated in the poly(A)- fraction from ganglia. A smaller RNA species was also detected at less than 10% the abundance of the major one. LAT was not detected with probes from DNA outside the limits of the larger species. In situ hybridization data correlated well with Northern blot analysis; however, low levels of hybridization were seen with probes immediately outside the region of viral DNA giving positive Northern blot signals. S1 nuclease and primer extension mapping were used to locate the 5' end of the LAT 510 bases to the left of a KpnI site at 0.783 map units. The 3' end of the major latency-associated species was mapped to just within a 310-base-pair SmaI fragment located 660 to 970 base pairs to the right of the SalI site at 0.790 map units. These data were correlated with an analysis of the sequence of the DNA encoding this transcript and its possible function in the latent phase of infection.

Amino Acid Sequence↗
PubMed1987

The kinetics of expression of individual herpes simplex virus type 1 transcripts.

We have used specific single-stranded DNA probes cloned in M13 to analyze the kinetics of expression of 20 individual herpes simplex virus type 1 (HSV-1) transcripts, most of known function. The three alpha transcripts studied all differ in the details of their shut-off. There are at least three groups of beta or early transcripts which differ both in the time of their maximum rate of synthesis and in the time of their shut off. Similarly late (beta gamma and gamma) transcripts form a complex group all of which share the fact that their rates of synthesis reach a maximum at a time when beta transcripts are being shut off.

Animals↗
PubMed1987

The effect of elevated levels of herpes simplex virus alpha-gene products on the expression of model early and late genes in vivo.

The rate of synthesis in vivo and the steady-state level of mRNA of four "model" herpes simplex virus type 1 (HSV-1) genes were measured as a function of high levels of alpha-gene products. The genes studied were ICP4 (alpha), deoxy-UTPase (beta), VP5 (beta gamma), and glycoprotein C (gC, gamma). Accumulation of high levels of alpha proteins was accomplished either by infection with an HSV-1 mutant, temperature-sensitive in ICP4 (ts606) at the nonpermissive temperature then shift-down to permissive temperature, or by infection with wild-type virus under cycloheximide blockage of protein synthesis followed by release. Compared to RNA expression in normal infections, beta gamma and gamma transcription rates were both transiently stimulated under the experimental conditions employed. The greatest effect was seen with the gamma-gC mRNA transcription rates. In addition, at nonpermissive temperatures with ts 606, the amount of expression of gC mRNA was significantly increased over normal early levels, in contrast to the case with the VP5 transcript. The impact of such results on models of HSV gene expression in vivo are discussed.

Animals↗
PubMed1985

Free gracilis transfer in the treatment of gluteus medius paralysis after poliomyelitis.

Paralysis of the gluteus medius after poliomyelitis often gives rise to secondary spinal deformity and inclination of the pelvis; the patient presents with a typical waddling gait. The paralysis is usually associated also with varying degrees of involvement and deformity of the extremities. Current treatment for paralysis of the gluteus medius has not been totally satisfactory. With the development of micro-neurovascular procedures, transfer of free muscle grafts for paralyzed or functionless muscles can be performed with functional recovery. The authors present a series of 12 cases, of which 10 were followed-up from 12 to 35 months. All of them had good cosmetic and functional results, with increased hip stability and stable gait. The operative technique, as well as the surgical anatomy, are described.

Adult↗