Cytokinin induced shoot regeneration and flowering of Scoparia dulcis L. (Scrophulariaceae)-an ethnomedicinal herb

OBJECTIVE

To develop an improved protocol for micropropagation of ethnomedicinally important Scoparia dulcis (S. dulcis) L.

METHODS

Explants were inoculated on MS basal medium supplemented with kinetin and 6-benzylaminopurine for shoot bud induction. To enhance the shoot induction, various auxins like 3-indoleacetic acid or 3-indolebutyric acid or α-naphthylacetic acid were tested along with 2.32 M KI and 4.44 µM BAP. The regenerated shoots were rooted in half strength MS medium supplemented with various concentrations of IAA, IBA or NAA. After roots were developed, the plantlets were transplanted to pots filled with vermiculate and sand and kept in growth chamber with 70%-80% humidity under 16 h photoperiod. After acclimatization, the plantlets were transferred to the garden and survival percentage was calculated. Data were statistically analyzed and means were compared using Duncan's multiple range test (P<0.05).

RESULTS

An in vitro method was developed to induce high frequency shoots regeneration from stem, mature leaf and young leaf explants of S. dulcis. Shoot induction on young leaf explants was most successful in MS medium supplemented with combination of two cytokinins (2.32 µM KI and 4.44 µM BAP) 2.85 µM IAA, 10% CM and 1 483.79 µM adenine sulfate. A single young leaf explant was capable of producing 59 shoots after 13 days of culture. Flower was induced in medium supplemented with combination of KI and BAP.

CONCLUSIONS

Cytokinins are the key factor to induce the direct shoot regeneration and flowering of S. dulcis.

To close or not to close? A systematic review and a meta-analysis of peritoneal non-closure and adhesion formation after caesarean section

Many gynaecologists do not currently close the peritoneum after caesarean section (CS). Recently, several studies examining adhesion formation after repeat CS appear to favour closure of the peritoneum after caesarean section. We performed a systematic review of the current available evidence with regard to the long-term outcome, mainly in terms of adhesion formation after closure versus non-closure of peritoneum during CS. We undertook a literature search between January 1995 and February 2008 using MEDLINE, Pubmed, EMBASE, Cochrane central controlled trials register and Cochrane pregnancy and childbirth group trials register. We also had searched all the references cited in the relevant studies. Both English and non-English language papers were included. Prospective studies which compared peritoneal closure versus non-closure during CS in terms of adhesion formation were included. Studies were included if they had a primary objective to examine adhesion formation in a repeat caesarean section, had a clear study design, had an adhesion scoring system, excluded patients who had adhesions in the primary caesarean section or interim surgeries after the primary caesarean section, and had no usage of anti-adhesion agents in the primary caesarean section. Retrospective studies which were performed by case-notes review alone, were excluded. Eleven studies were identified via our search strategy. Five were retrospective and six were prospective. Out of the eleven studies, three satisfied the inclusion criteria and were included (n=249); two studies were follow-ups of RCTs and one was not randomised. Out of 249 women included in the analysis, 110 had peritoneal closure during CS whereas the other 139 did not have peritoneal closure. Meta-analysis was performed using the two randomised studies plus (i) the unadjusted estimate from the non-randomised study and (ii) the reported adjusted estimate, adjusted for baseline differences in the groups. Non-closure of the peritoneum during CS resulted in a significantly increased likelihood of adhesion formation in both meta-analyses--OR (95% CI): (i) 2.60 (1.48-4.56) and (ii) 4.23 (2.06-8.69). This systematic review has demonstrated that according to current data in the literature, there is some evidence to suggest that non-closure of the peritoneum after caesarean section is associated with more adhesion formation compared to closure.

Adoption of computer aided software engineering (CASE) technology

This study examines the impact of various organizational and technology characteristics on the adoption of computer aided software engineering (CASE) technology. Based on research in innovation adoption and IS implementation, the study develops a research model comprised of seven factors that are important for the successful adoption of CASE technology. The data for the study were collected through a field survey of IS managers in the midwest area and 90 responses were received. The results of discriminant analysis reveal that of the seven predictor variables, five are important to differentiate adopters from non-adopters. They are the existence of a product champion, strong top management support, lower IS expertise, perception that CASE technology has greater relative advantage over other alternatives, and a conviction of the cost effectiveness of the technology. The results are consistent with findings in innovation adoption literature as well as case studies of many firms' experience on CASE implementation.