Biomedical subjects

R Ma

Publications and source records attributed to R Ma.

At least 145 records · Page 8Linked to original sources

PubMed1990

Major factors and conditions for migration: survey in Chifeng, Nei Mongol Autonomous Region.

The author analyzes results from a 1985 survey by the Institute of Sociology of Beijing University that examined rural-rural migration of household heads in the Chifeng region of China. "The key issues addressed by the survey included the number of immigrants in the current rural population in Chifeng; the immigrant's date of arrival; the factors that led them to leave their native places and choose Chifeng to settle down [in] and the conditions encountered in the process of their migration and settlement." More than 2,000 families were included in the survey.

Asia↗

PubMed1990

[Antiviral and interferon-inducing effect of fang-gan mixture].

The present study was carried out by using the plaque formation test, microdosage cytopathic effect (CPE) method, and mice nasal-cavity-attacking method to observe the antiviral and interferon-inducing effect of Fang-Gan mixture (FGM). The results showed that FGM has direct respiratory syncytia virus (RSV) inactivation effect, and protection effect after mice infected by RSV. FGM could also decrease mice death rate (P less than 0.01) in the experimentation of using parainfluenza virus to attack them, and work in coordination with interferon induced by Newcastle disease virus. After 8, 16, 24, 32 hours of injecting FGM into mice abdominal cavity, the authors used CPE method to determine interferon titer of L929 cells, and found that the highest interferon titer was 98.23 mu/m at the 24th hour. The interferon induced by FGM was in keeping with the nature of Type I interferon. The results suggested that FGM might have strong antiviral effect which is achieved by inducing interferon.

Animals↗

PubMed1990

[An investigation on adrenergic receptors in rat stomach].

The effects of phentolamine and propranolol on intragastric pressure were observed in 46 Wistar rats. The results showed that: (1) phentolamine did not cause significant changes in the intragastric pressure of intact rats, but, it could obviously decrease the intragastric pressure of rats with vagotomy. (2) propranolol increased the intragastric pressure of intact rats or rats with vagotomy. We concluded that (1) tonic action of adrenergic nerves in stomach is mainly inhibitory; (2) beta-adrenoceptors, which may be present on the smooth muscle of stomach mediate sympathetic inhibition; (3) alpha-adrenoceptors, which come into play through vagus, mediate inhibition, but alpha-adrenoceptors, which may be present on the smooth muscle, mediate sympathetic excitation.

Animals↗

PubMed1990

[Effect of an extract of Paeonia lactiflora on the blood coagulative and fibrinolytic enzymes].

Paeonia lactiflora with the action of promoting blood circulation and removing blood stasis had been shown to be able to inhibit thrombosis and platelet aggregation, increase fibrinolytic activity and promote thrombolysis. This paper described the influence of the extract of Paeonia lactiflora in vitro experiments on prothrombin time (PT), activated partial thromboplastin time (PTT), antithrombin effect, activity of plasminogen and urokinase. The experimental results showed that: (1) The extract of Paeonia lactiflora prolonged the time of PT and PTT. (2) The extract of drug was able significantly to inhibit the thrombin. (3) In study of fibrinolysis by fibrin standard plate experiments, the drug possessed activative effect on the plasminogen. (4) The activity of urokinase was reduced, while the extract of Paeonia lactiflora existed. The inhibitory effect on thrombin and effective effect on plasminogen of the drug might be an important mechanism of its action of promoting blood circulation and removing blood stasis.

Animals↗

PubMed1989