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Biomedical subjects

K C Liu

Publications and source records attributed to K C Liu.

At least 55 records · Page 3Linked to original sources
PubMed1981

Effect of glass wool filtration on ultrastructure of human spermatozoa.

The results of this study strongly suggest that filtration by glass wool can induce damage to the membrane and acrosome of the heads of some spermatozoa in a population. It is possible that the potential fertilizing capacity of a population of human spermatozoa may be reduced as a consequence of these alterations, especially those to the acrosome. The results suggest that sufficient clinical applications of glass wool filtration in artificial insemination is the only way to evaluate both the potential benefits of this process and the potential drawbacks to efficiency that may be caused by a degree of ultrastructural damage.

Acrosome↗
PubMed1979

Minute tubular forms in soil.

Large numbers of minute, flat, long, straight, but often broken structures were observed in aqueous extracts of soil. We have applied the purely descriptive term 'tubules' to these structure, because they apparently became flattened during preparation for electron-microscopic viewing. The tubules appeared to be composed of parallel fibers held together by protein. Most of the tubules fell within a ranged of 10 to 50 nm in width. Lengths (of broken pieces) ranged from 0.2 to 1 micron or more. A few unbroken ends were found. They were rounded. Tubular structures of similar dimensions were found surrounding lysed cells in sectioned preparations of bacteria that had been separated from soil. The tubules were present in surface soils but not a subsurface sample. Their numbers decreased during bacterial multiplication in soil or broth containing soil. No evidence was found of cleared areas or increase in number of tubules when the tubules were plated with a heterogeneous microbial flora from soil.

Bacteria↗
PubMed1977

Acute haemorrhagic conjunctivitis in Hong Kong 1971-1975.

Acute haemorrhagic conjunctivitis occurred in epidemic in Hong Kong in 1971 and 1975 respectively. Two picornaviruses, the Enterovirus type 70 and an antigenic variant of Coxsackie virus type A24, were isolated during the 1971 outbreak, while only the latter virus was detected in the 1975 outbreak. In 1972 and 1974, sporadic cases of conjunctivitis associated with Enterovirus type 70 were observed. Serological survey in late 1975 showed a high proportion of the population might still be susceptible to both viruses. Recrudescence of the disease is conceivable when environmental condition is favourable for the spread of these viruses.

Adenoviruses, Human↗
PubMed1976

Colonization of soil by Arthrobacter and Pseudomonas under varying conditions of water and nutrient availability as studied by plate counts and transmission electron microscopy.

Arthrobacter globiformis and a Pseudomonas soil isolate were incubated separately and in combination in soil that had been presterilized by autoclaving. Growth and other responses of the cells in situ in this soil were monitored by plate counts and transmission electron microscopy examinations of cell sections. During the soil incubations, some of the samples were first allowed to dry and then were remoistened with water or with a dilute or a concentrated nutrient solution. Based on plate counts and ultrastructural analysis. Arthrobacter seemed to be in a non-multiplying coccoid-rod resting state and to be virtually immune to soil drying. Addition of a dilute nutrient solution helped maintain cell ultrastructure and prevent a low level of lysing that occurred in the absence of nutrient addition. Addition of a concentrated nutrient solution brought on cell multiplication as both coccoid-rods and long rods, but the ultimate form with further incubation was the coccoid-rod. The Pseudomonas strain suffered death and ultrastructural deterioration as water became less available. It responded by cell multiplication to an equal extent when either water or dilute nutrients were added, but possibly was able to give a growth response to nutritive amendment when a concentrated nutrient addition was made. The Arthrobacter was not affected by the presence of Pseudomonas in dual culture. The Pseudomonas, however, possibly suffered a nutritive deficiency under these conditions.

Arthrobacter↗