DURATION OF MITOTIC CYCLE AND REGULATION OF DNA REPLICATION IN NICOTIANA PLUMBAGINIFOLIA AND A HYBRID DERIVATIVE OF N. TABACUM SHOWING CHROMOSOME INSTABILITY

1969 ◽  
Vol 11 (1) ◽  
pp. 133-142 ◽  
Author(s):  
S. B. Gupta
Keyword(s):  
Mitotic Cycle ◽  
Chromosome Instability ◽  
Nicotiana Plumbaginifolia ◽  
Root Tips ◽  
Time Intervals ◽  
Pulse Label ◽  
Significant Difference ◽  
Synthetic Phase ◽  
Autoradiographic Detection ◽  
Hybrid Derivative

The duration of the mitotic cycle with its component phases in Nicotiana plumbaginifolia (pbg, 2n = 20) and a hybrid derivative of N. tabacum (tbc, 2n = 48 and N. plumbaginifolia was determined from the root tips. A 30 minute pulse label of H3-thymidine was employed for the autoradiographic detection of the labeled prophases.The time intervals, for the total generation time (T), postsynthetic phase (G2), prophase, synthetic phase (S), and the combined presynthetic phase, metaphase, anaphase, telophase (G1 + M + A + T) in N. plumbaginifolia were estimated as 11.0, 3.4, 1.3, 5.7 and 0 6 hours, respectively. In the hybrid derivative the corresponding estimates were 9.0, 1.4, 0.8, 3.8 and 3.0 hours.The G1, S and G2 periods of N. plumbaginifolia were found significantly different from those of the hybrid derivative, but the duration of the mitotic cycle did not show a significant difference. On the basis of the distribution of heterochromatin and its late replication in N. plumbaginifolia chromosomes, possible causes of instability of alien pbg chromosomes in N. tabacum nuclei are discussed.

A prospective randomized study to assess the efficacy of post-operative nasal medication after endonasal surgery

1995 ◽  
Vol 109 (7) ◽  
pp. 618-621 ◽  
Author(s):  
Paul D. R. Spraggs ◽  
Marcelle Macnamara ◽  
Theo Joseph
Keyword(s):  
Randomized Study ◽  
Correlation Coefficients ◽  
Control Group ◽  
Time Intervals ◽  
Treatment Groups ◽  
Ephedrine Hydrochloride ◽  
Patent Airway ◽  
Significant Difference ◽  
Blood Clots ◽  
Betamethasone Sodium Phosphate

AbstractPost-operative nasal medications are commonly used following routine septal or turbinate surgery but their efficacy in removing blood clots, improving the sensation of a patent airway and promoting healing are unknown. This prospective randomized trial of patients undergoing septal and/or turbinate surgery assessed the efficacy of three commonly used nasal medicines, 0.5 per cent ephedrine hydrochloride nasal drops, betamethasone sodium phosphate (Betnosol®) nose drops and alkaline nasal douches, in producing the sensation of a patent airway in the 14 days following surgery. Ninety-seven patients were randomized into the three treatment groups and a control group who received no nasal medication. Patients assessed their nasal patency by means of a visual analogue scale (VAS) and any complications of treatment were recorded. Statistical analysis of the 76 complete sets of results using the Mann-Whitney U-test showed that there was a significant difference in the distribution of all of the treatments for each of the time intervals (p<0.05). Glass rank biserial correlation coefficients were all small (rg<0.085) but the most significant differences were between ephedrine and the control group at two hours, two, seven and 10 days (0.02, 0.054, 0.057, 0.085 respectively), alkaline nasal douches being most significant at four and 14 days (0.06 and 0.0722 respectively).

scholarly journals Fine Structure and Staining Behaviour of Heterochromatic Segments in Two Plants

1974 ◽  
Vol 14 (3) ◽  
pp. 505-521
Author(s):  
L. F. LACOUR ◽  
B. WELLS
Keyword(s):  
Fine Structure ◽  
Light Microscope ◽  
Mitotic Cycle ◽  
The Other ◽  
Masking Effect ◽  
Root Tips ◽  
Metaphase Chromosomes ◽  
Differential Reactivity ◽  
Scilla Sibirica ◽  
Electron Microscopes

With the use of the light and electron microscopes, the chromosomes of Fritillaria lanceolata and Scilla sibirica are shown to differ in respect of the heterochromatin they contain. In root meristems of the former, the heterochromatic regions (H-segments) were recognizable at all phases of the mitotic cycle by their slighter opacity to electrons than that of euchromatic parts. This was due both to less tight packing of the chromatin fibrils and lower opacity of the fibrils themselves, even though both had the same diameter, about 3 nm. In root tips of the Scilla, the heterochromatin was invariably of similar opacity to euchromatin and thus only recognizable at telophase and interphase as large chromocentres. The opacity to electrons in the heterochromatin of the 2 species, was at all times closely paralleled by the staining behaviour seen with the light microscope in sections (0.07-0.5 µm in thickness) stained with toluidine blue. The disparity in the Fritillaria, as seen in sections with the light microscope, in respect of the stainability of the hetero- and euchromatin, was masked in Feulgen squash preparations of root tips from plants grown at 18-20 °C; at metaphase by the thickness of the chromosomes and at interphase by the density of the chromocentres. When, on the other hand, the plants were grown for 4 days at 2 °C, the masking effect of thickness was circumvented in metaphase chromosomes by differential super-contraction in euchromatin. The implications of these findings in respect to previous interpretations of the differential reactivity of H-segments to low temperature, as well as the phenomenon of enhanced and reduced fluorescence in these segments with fluorochromes are discussed.

scholarly journals Experimental Pulpitis Treated By Double-Pinhole Drainage

2019 ◽  
Vol 3 (2) ◽  
Keyword(s):  
Dental Pulp ◽  
Control Group ◽  
Pulp Chamber ◽  
Control Groups ◽  
Time Intervals ◽  
Irrigation Methods ◽  
Significant Difference ◽  
And Control ◽  
Experimental Group ◽  
Labial Surface

Objective: To search for a dental pulp preservative method in experimental pulpitis. Methods: 20 rabbits with experimental pulpitis were selected for this study; Teeth were randomly assigned to 2 groups (experimental and control groups) based on the final irrigation methods. In experimental group (double-pinhole drainage), the two pinholes were drilled in middle 1/3 dental cervix of buccal labial surface of tooth; the pinholes were inserted into infant transfusion needles then the two syringes were contacted with them, one for suck, another for irrigation. In control group, pinhole was sealed. Rabbits were executed in 1, 3, 5, 7 day. The inflammation in pulp chamber was assessed after 1, 3, 5, and 7 days. Results: At the 1, 5 day time intervals, control group reported more inflammation than experimental group (P < .05). There was no significant difference between two groups at the other time intervals (P > .05), and in all groups the inflammation decreased over time. Conclusion: Dental pulp can be preserved by double-pinhole drainage efficiently.

scholarly journals 10% povidone-iodine versus 2% chlorhexidine gluconate for Periurethral cleansing before catheterization among hospitalized patients: A randomized controlled trial

2019 ◽  
Author(s):  
elham vahabi ◽  
somayeh ghafari ◽  
somayeh haghighat
Keyword(s):  
Randomized Controlled Trial ◽  
Povidone Iodine ◽  
Controlled Trial ◽  
Chlorhexidine Gluconate ◽  
Hospitalized Patients ◽  
Time Intervals ◽  
Randomized Controlled ◽  
Significant Difference ◽  
Tract Infections ◽  
Urine Specimens

Abstract Background There are evidences that periurethral cleaning by antiseptics before catheterization decreases the risk of urinary tract infections. The purpose of this study was to Comparing 10% povidone-iodine and chlorhexidine gluconate (CHG) effectiveness in periurethral cleaning before catheterization on bacteriuria and pyuria in hospitalized patients. Methods A randomized controlled trial was used, and subjects were randomly allocated to either the 10% povidone -iodine group or the 2% chlorhexidine gluconate group. Urine specimens for culture and Analyse were collected 3 times for each subject within 5 days. Results Overall, 216 urine samples were collected in 72 subjects .There were no significant difference in results of bacteriuria of two groups immediately, 72 hrs. and 5 days after catheterization (p>0.05). There was no significant difference between two groups regarding positive pyuria immediately after sampling (p>0.05). Although its amount was significantly higher 72 hrs and 5days after catheterization in 10% povidone-iodine group than 2% chlorhexidine gluconate (p<0.05). In order to evaluate average of micro-organism in different time intervals between two groups Mann– Whitney test was used. This test showed that there was no significant difference of number of time intervals (p>0.05). Conclusions The results of this study showed that using 2% chlorhexidine gluconate reduced the amount of bacteriuria in catheterazied patients compared to 10% povidone-iodine. However this difference was not significant. Therefore doing more studies with more number of samples in this field is suggested. Trial registration: Retrospectively registered. IRCT20170712035044N2 Key words: 10% povidone-iodine- 2% chlorhexidine gluconate - Bacteriuria- Periurethral cleansing

scholarly journals P.099 Specialty centres for MVD surgery

2018 ◽  
Vol 45 (s2) ◽  
pp. S42-S42
Author(s):  
A Montazeripouragha ◽  
AM Kaufmann
Keyword(s):  
Length Of Stay ◽  
Trigeminal Neuralgia ◽  
Disease Onset ◽  
High Volume ◽  
Referral Process ◽  
Time Intervals ◽  
Patient’S Satisfaction ◽  
Significant Difference ◽  
Postoperative Length ◽  
Delays In Diagnosis

Background: The aim of this study is comparing the waiting time and patient’s satisfaction of microvascular decompression (MVD) surgery between local Manitoba (MB) and out of province (OOP) patients, treated at our Centre for Cranial Nerve Disorder (CCND). Methods: Data from 100 consecutive patients (average age: 56.8±10.6 years), undergoing MVD surgery for Trigeminal Neuralgia (TN) and Hemifacial Spasm (HFS) were reviewed. The outcome measures included the time intervals between disease onset, diagnosis and referral to CCND, postoperative discharge, satisfaction with surgical outcome and referral process. Results: The preoperative time leading to CCND referral were longer for OOP patients, (onset to diagnosis/diagnosis to referral: 2.6±3.8/4.2±4.7 (OOP) versus 1.2±2.1/2.5±4.1 (MB) years; p=0.04/0.04), and referrals were more likely self-directed in OOP patients (62% (OOP), 21% (MB); p=0.007). Postoperative satisfaction with MVD outcome were 8.6/10 for OOP and 8.3/10 for MB patients. There was no significant difference in postoperative length of stay (38±50 (OOP)/43±42 (MB) hours); however, OOP patients were more likely discharged on the first postoperative day (58% (OOP), 31% (MB); p=0.17). Conclusions: Delays in diagnosis and surgical referral of TN/HFS are common, and many patients seek specialist’s opinion in high volume surgical centers. For those OOP patients, travelling for treatment, MVD outcome were at least as good as for local patients.

scholarly journals Comparative Time-Dependent Evaluation of Dimensional Accuracy of Dies Using Different Tray Adhesives: An In Vitro Study

2018 ◽  
Vol 6 (02/03) ◽  
pp. 106-111
Author(s):  
Ramandeep Kaur ◽  
Manjit Kumar ◽  
Shailesh Jain ◽  
Neha Jindal
Keyword(s):  
Bond Strength ◽  
In Vitro Study ◽  
Dimensional Accuracy ◽  
Time Dependent ◽  
Time Intervals ◽  
Crosshead Speed ◽  
Significant Difference ◽  
Different Types ◽  
Separation Failure

Abstract Statement of Problem The adhesion of impression material to impression tray is very important. Tray adhesive plays a major role in making accurate impression. Although manufactures recommend the use of particular tray adhesives, comparison of their affective adhesiveness has not been reported. The effect of use of tray adhesives on dimensional accuracy of dies has not been established. Purpose The aim of this study was to compare the dimensional accuracy of dies using different tray adhesives at different time intervals. Materials and Methods First part of study comprised 120 samples in six groups with 20 samples in each group. First group comprised samples with no tray adhesive, and in other five groups, different types of tray adhesives were applied. The dies obtained were evaluated for upper diameter, lower diameter, and occlusogingival height. In the second part, there were a total of 125 samples in five groups with 25 samples in each group. Five different types of tray adhesive were applied for five different time intervals 5, 10, 15, 20, and 25 minutes, respectively. The specimens were tested in tensile mode for its debonding force at a crosshead speed of 5 mm/min, until separation failure occurred. Results Significant difference was seen for upper and lower diameters when compared with the group without any tray adhesive. The maximum bond strength was found in the group in which tray adhesive was applied for 20 minutes.

scholarly journals Effect of Chinese Propolis as an Intracanal Medicament on Post-Operative Endodontic Pain: A Double-Blind Randomized Controlled Trial

2020 ◽  
Vol 17 (2) ◽  
pp. 445 ◽  
Author(s):  
Juzer Shabbir ◽  
Fazal Qazi ◽  
Waqas Farooqui ◽  
Shahbaz Ahmed ◽  
Tazeen Zehra ◽  
...  
Keyword(s):  
Calcium Hydroxide ◽  
Controlled Trial ◽  
Repeated Measure ◽  
P Value ◽  
Time Intervals ◽  
Pain Scores ◽  
Significant Difference ◽  
Bonferroni Test ◽  
The Impact ◽  
Chinese Propolis

Propolis is a potent anti-microbial and natural anti-inflammatory by-product obtained from the beehive. Studies have demonstrated the superior biocompatibility and anti-microbial properties of propolis as compared to calcium hydroxide. However, its effect on postoperative endodontic pain is unknown. Therefore, this study aimed to investigate the impact of Chinese propolis paste as an intracanal medicament on postoperative endodontic pain intensities compared with calcium hydroxide (control) at different time intervals in necrotic teeth with periapical radiolucency. Eighty patients with single-rooted necrotic teeth with visible periapical radiolucency were recruited and randomly allocated to either the calcium hydroxide or propolis groups. After chemo-mechanical preparation and intracanal medicament insertion, patients were given the VAS (visual analogue scale) to record pain scores. Inter-group data were compared and analyzed using two-way repeated measure ANOVA (Bonferroni test). A p-value of < 0.025 was considered significant. In total, >78% of the patients experienced no or only mild post-operative pain in both the groups at all time intervals, without any significant difference in pain scores between the two groups (p > 0.025). An overall flare-up rate of 14.8% was found. The results suggest that either of these medicaments can be used as an inter-appointment medication for the prevention of postoperative pain in necrotic cases.

scholarly journals Effects of palonosetron and ondansetron on preventing nausea and vomiting after laparoscopic surgery

2017 ◽  
Vol 46 (1) ◽  
pp. 411-420 ◽  
Author(s):  
Qili Liu ◽  
Chengmao Zhou ◽  
Zeqing Bao ◽  
Yu Zhu
Keyword(s):  
Laparoscopic Surgery ◽  
Meta Analysis ◽  
Postoperative Nausea And Vomiting ◽  
Nausea And Vomiting ◽  
Cochrane Library ◽  
Time Intervals ◽  
Randomized Controlled Clinical Trials ◽  
Randomized Controlled ◽  
Significant Difference ◽  
The Cochrane Library

Background This meta-analysis was performed to evaluate the efficacy and safety of palonosetron and ondansetron in preventing postoperative nausea and vomiting (PONV) in patients undergoing laparoscopic surgery with general anesthesia. Methods We searched for randomized controlled clinical trials in PubMed, Embase, and The Cochrane Library. Results Nine studies were enrolled in this meta-analysis and showed no statistically significant difference between palonosetron and ondansetron in the prevention of PONV in the first 24 hours after surgery (relative risk [RR], 0.62; 95% confidence interval [CI], 0.35–1.10). Palonosetron more effectively prevented vomiting at various time intervals during the first 24 hours postoperatively than did ondansetron: 0–2 hours (RR, 0.45; 95% CI, 0.26–0.78), 2–6 hours (RR, 0.74; 95% CI, 0.39–1.40), and 6–24 hours (RR, 1.20; 95% CI, 0.55–2.64). No significant differences in side effects were found between palonosetron and ondansetron (RR, 0.67; 95% CI, 0.40–1.14). Conclusion This meta-analysis demonstrated that palonosetron is not more efficacious than ondansetron in the prevention of early PONV. However, palonosetron was more efficacious than ondansetron in the prevention of vomiting after laparoscopic surgery.

scholarly journals Effect of fluoride sodium mouthwash solutions on cpTI: evaluation of physicochemical properties

2012 ◽  
Vol 23 (5) ◽  
pp. 496-501 ◽  
Author(s):  
Marcelo Bighetti Toniollo ◽  
Rodrigo Galo ◽  
Ana Paula Macedo ◽  
Renata Cristina Silveira Rodrigues ◽  
Ricardo Faria Ribeiro ◽  
...  
Keyword(s):  
Anodic Polarization ◽  
Titanium Surface ◽  
Pure Titanium ◽  
Distilled Water ◽  
Commercially Pure Titanium ◽  
Time Intervals ◽  
Commercially Pure ◽  
Significant Difference ◽  
Scanning Electron ◽  
Corrosion Data

The effects of fluoride, which is present in different oral hygiene products, deserve more investigation because little is known about their impact on the surface of titanium, which is largely used in Implantology. This study evaluated the surface of commercially pure titanium (cpTi) after exposure to different concentrations of sodium fluoride (NaF). The hypothesis tested in this study was that different concentrations of NaF applied at different time intervals can affect the titanium surface in different ways. The treatments resulted in the following groups: GA (control): immersion in distilled water; GB: immersion in 0.05% NaF for 3 min daily; GC: immersion in 0.2% NaF for 3 min daily; GD: immersion in 0.05% NaF for 3 min every 2 weeks; and GE: immersion in 0.2% NaF for 3 min every 2 weeks. The experiment lasted 60 days. Roughness was measured initially and every 15 days subsequently up to 60 days. After 60 days, corrosion analysis and anodic polarization were done. The samples were examined by scanning electron microscopy (SEM). The roughness data were analyzed by ANOVA and there was no significant difference among groups and among time intervals. The corrosion data (i corr) were analyzed by the Mann-Whitney test, and significant differences were found between GA and GC, GB and GC, GC and GD, GC and GE. SEM micrographs showed that the titanium surface exposed to NaF presented corrosion that varied with the different concentrations. This study suggests that the use of 0.05% NaF solution on cpTi is safe, whereas the 0.2% NaF solution should be carefully evaluated with regard to its daily use.

Sign in / Sign up

Export Citation Format

Share Document