Biomedical subjects

E Karanastasi

Publications and source records attributed to E Karanastasi.

2 recordsLinked to original sources

PubMed2001

Twin chorionicity and pre-eclampsia.

OBJECTIVE: To determine whether the incidence of pre-eclampsia is different in dichorionic compared to monochorionic twin pregnancies. METHODS: The study involved 666 twin pregnancies resulting in two live births after 24 weeks of gestation. Ultrasound examination at 10-14 weeks of gestation demonstrated that 171 (25.7%) were monochorionic and 495 (74.3%) were dichorionic twins. Pregnancy outcome information regarding the development of pre-eclampsia was obtained from the maternity units. The incidence of pre-eclampsia in the dichorionic and monochorionic twin pregnancies was compared. RESULTS: The incidence of pre-eclampsia in monochorionic twin pregnancies (9.4%) was not significantly different from that in dichorionic pregnancies (7.3%) ( P = 0.48). Multiple logistic regression revealed that chorionicity has no effect on the development of pre-eclampsia after adjusting for maternal age, ethnic group, maternal smoking, parity and gestational age at delivery ( P = 0.6; odds ratio for monochorionic compared with dichorionic twin pregnancies, 1.19; 95% confidence interval, 0.61-2.3). CONCLUSION: In twin pregnancies chorionicity does not affect the incidence of pre-eclampsia.

Adult↗

PubMed2001

Observations on the feeding behaviour of Paratrichodorus anemones in relation to tobravirus transmission.

Feeding by P. anemones, an efficient vector of tobacco rattle virus (TRV), was investigated by video-enhanced interference light microscopy. Four stages were observed after transfer of individual nematodes, extracted from soil, to Nicotiana tabacum seedling roots in agar: i) acclimatisation; ii) approach and scrutiny; iii) preparation; and iv) feeding. Prior to commencement of stage 'iv' about 4 cells perforated by rapid onchiostyle thrusting remained alive, each having been almost immediately abandoned by the nematode. During the stage iv) approximately 5% of perforated cells remained alive. Feeding on individual cells was similar to that previously reported for Trichodorus similis: cells from which cytoplasm was ingested after a prolonged period of salivation were invariably killed, with adjacent cells being unaffected. During feeding a number of cells perforated but soon afterwards abandoned by P. anemones remained alive, providing an effective pathway for successful transmission of TRV to plants by the nematode.

Animals↗