An Aphid Sex Attractant

1970 ◽  
Vol 1 (1) ◽  
pp. 63-73 ◽  
Author(s):  
Jan Pettersson
Keyword(s):  
Statistical Analysis ◽  
Sex Attractant ◽  
T Test ◽  
Chemical Signal ◽  
Larval Instars ◽  
Student’S T ◽  
Student’S T Test

AbstractThe experiments described have given the following conclusions: (I) A chemical signal (pheromone) emitted by the oviparous female has an attractive effect upon the males. This signal is not emitted by the virginogeniae. (2) The signal is emitted by organs situated on the hind tibiae of the oviparous female and perceived by organs on the male antennae. (3) The substance is only emitted by the females during a certain period in their lifetime. Apparently, this is principally the condition which has been called active copulatory period (ACP). No emittance was found neither during the passive precopulatory period (PPP) nor during the passive postcopulatory period (PCP). (4) Males are capable of detecting and reacting to the signal already in the last two larval instars. (5) The males do not emit any substance affecting other males. Statistical analysis (Student's t-test) of the material has been excluded as it gave significance only in experiments where differences between the stimuli are apparent.

scholarly journals The influence of proteinuria on tubular transport of Na+, K+, CL

2002 ◽  
Vol 130 (3-4) ◽  
pp. 64-67
Author(s):  
Dejan Petrovic ◽  
Radmila Obrenovic ◽  
Mileta Poskurica ◽  
Biljana Stojimirovic
Keyword(s):  
Statistical Analysis ◽  
Creatinine Clearance ◽  
Significant Influence ◽  
Fractional Excretion ◽  
T Test ◽  
The Third ◽  
Tubular Transport ◽  
Student’S T ◽  
Student’S T Test

Functional and structural damages of tubulointerstitium are caused by proteinuria. The aim of this study was to assess the influence of different proteinuria levels on Na+, K+, Cl tubular transport. We examined 50 patients (24 males, 26 females), mean age 46.50 ? 13.08 years, with mean creati-nine clearence of 87.29 ? 31.17 mL/min. They were separated in three groups depending on proteinuria value. The first group with proteinuria less than 0.3 g/24h included 19 persons (7 males, 12 females), mean age 45.12 ? 13.28 years, with mean creatinine clearance of 94.27 ? 34.70 mL/min. The second group of 18 patients (8 males, 10 females), mean age 45.39 ? 12.64 years had proteinuria of 0.3-3,0 g/24h and mean creatinine clearance of 90.07 ? 31.89 mL/min. The third group had proteinuria level higher than 3.0g/24h and mean creatinine clearance of 73.25 ? 20.44 mL/min. It included 13 patients (9 males, 4 females), mean age 50.08 ? 13.73 years. As a parameter of proteinuria influence on tubular transport of Na+, K+ and Cl-, fractional excretion of these electrolytes, was studied. Student's T test, Mann Whitney U test and c2 test were used for statistical analysis. No statistically significant influence of proteinuria was found on Na+, K+ and Cl tubular transport.

scholarly journals A Study to Relate Sagittal Condylar Path and Horizontal Incisal Path with Bilateral Balanced Occlusion in Edentulous Subjects

2020 ◽  
Vol 10 (01) ◽  
pp. 31-41
Author(s):  
Krishna Prasad D. ◽  
B. Rajendra Prasad ◽  
Anupama Prasad D.
Keyword(s):  
Statistical Analysis ◽  
T Test ◽  
Blue Color ◽  
Age Group ◽  
Centric Relation ◽  
Pearson Coefficient ◽  
Coefficient Corrélation ◽  
Student’S T ◽  
Artificial Teeth ◽  
Student’S T Test

Abstract Introduction Bilateral balanced occlusion is achieved when there is equilibrium on both sides of the prosthesis, due to the simultaneous contact of the artificial teeth in centric and eccentric occlusion. One of the areas in which research is lacking is the relation between sagittal condylar path (CP) and horizontal incisal path (IP) with optimal balanced occlusion. Materials and Methods Semiadjustable Articulator Artex Arcon AP with Rotofix facebow, 40 µ Bosch articulating paper of red and blue color, protractor, centric and protrusive interocclusal plaster records were used for the study on 50 completely edentulous subjects. Teeth arrangement was done with optimal balanced occlusion, and the numbers of contacts were recorded in centric relation and eccentric positions. Statistical analysis was done by using student’s t test and Karl Pearson coefficient correlation. Results The average sagittal CP was 30.38° in the age group of 40 to 55 years and 32.58° in the age group of 56 to 70 years, and the average horizontal IP was 15.79° in the age group of 40 to 55 years and 16.04° in the age group of 56 to 70 years.Statistically significant results were found between sagittal CP, horizontal IP with bilateral balanced occlusion in the age group of 40–55 years. Conclusion Statistically significant relations were found in balanced occlusion between waxed up denture on articulator, processed denture on articulator and processed denture on articulator after selective grinding. Balanced occlusion is more predictable in a younger group of individuals.

scholarly journals Hardiness of Young People and Pre-Retirement Age People Living in the Republic of Tuva

2021 ◽  
Vol 35 ◽  
pp. 67-83
Author(s):  
S. M. Mombey-ool ◽  
◽  
C. N. Mongush ◽  
V. L. Sitnikov ◽  
S. I. Kedich ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Statistical Analysis ◽  
Young People ◽  
Risk Taking ◽  
T Test ◽  
Retirement Age ◽  
Sense Of Control ◽  
The Republic ◽  
Student’S T ◽  
Student’S T Test

The article presents the results of the comparative analysis of hardiness of young people between the ages of 18 and 35, and pre-retirement people with the help of Maddi’s Hardiness Test modified by D. Leontyev. Student’s t-test has been used to verify credibility of differences between two independent samplings. Mathematical and statistical analysis used to compare the results of young and pre-retirement age people’s survey has shown that people approaching retirement age are more resilient then young people and people before the age of 35. Young people have proved to show risk-taking behavior more, while persons nearing retirement age are more involved into and have a sense of control of their own life as opposed to young people. According to all the parameters studied these two groups showed significant differences.

Analysis of Sulfites in Shrimp Using Rapid Distillation Followed by Redox Titration1

1988 ◽  
Vol 51 (2) ◽  
pp. 137-138 ◽  
Author(s):  
MARIAN V. SIMPSON ◽  
W. STEVEN OTWELL ◽  
MAURICE R. MARSHALL ◽  
JOHN A. CORNELL
Keyword(s):  
Statistical Analysis ◽  
Steam Distillation ◽  
Accurate Determination ◽  
T Test ◽  
Distillation Method ◽  
Student’S T ◽  
Student’S T Test

The use of rapid steam distillation followed by redox iodine titration provides a rapid and accurate determination of total sufite residual in shrimp. Values obtained for sulfite-treated shrimp using the rapid distillation method gave comparable results to those of the officially recognized Monier-Williams method. Values for the rapid distillation method ranged from 6 to 212 ppm while those of the Monier-Williams procedure ranged from 6 to 241 ppm for untreated and treated shrimps, respectively. Statistical analysis using two-sample Student's t-test indicated that there were no significant differences (p>0.05) for residual levels below 100 ppm but the values obtained by the rapid distillation method and the Monier-Williams procedure were significantly different (p<0.05) at concentrations near and above 100 ppm.

scholarly journals O uso do smartphone pelos universitários que trabalham: identificando os paradoxos tecnológicos

2019 ◽  
Vol 12 (5) ◽  
pp. 1027
Author(s):  
Kathiane Benedetti Corso ◽  
Martiele Gonçalves Moreira
Keyword(s):  
Statistical Analysis ◽  
Descriptive Study ◽  
Intimate Relationship ◽  
T Test ◽  
Professional Lives ◽  
Student’S T ◽  
The Relationship ◽  
Student’S T Test ◽  
Descriptive Statistical Analysis

With the advent of technology, smartphones have occupied a prominent place in their users’ personal and professional lives. Thus, it is relevant to understand how the relationship between smartphones and individuals occurs, which may be paradoxical and not distinguish the positive and negative uses of the device. This situation may interfere in the lives of these people. This research is a descriptive study, which used univariate descriptive statistical analysis by means of data and Student’s t-test; it was performed with individuals who face double shift (working and studying). We identified the presence of eight paradoxes, which can be classified into two categories: the first refers to the intimate relationship between individuals and smartphones, whereas the second concerns the functionalities of this type of device. This article also retrieves studies that have addressed the theme “paradoxes”, making a comparison with this study. It was possible to notice differences and similarities over the years.

scholarly journals An evaluation of the effect ov lanolin in healing nipple injuries

2008 ◽  
Vol 21 (1) ◽  
pp. 11-16 ◽  
Author(s):  
Kelly Pereira Coca ◽  
Ana Cristina Freitas de Vilhena Abrão
Keyword(s):  
Experimental Study ◽  
Statistical Analysis ◽  
Random Sample ◽  
Left Breast ◽  
T Test ◽  
Control Group ◽  
Maternity Hospitals ◽  
Student’S T ◽  
Experimental Group ◽  
Student’S T Test

OBJECTIVE: To evaluate the effect of anhydrous lanolin-based ointment in the process of healing nipple injuries. METHODS: This is a descriptive experimental study was performed in two Maternity Hospitals in Sao Paulo. The random sample consisted of 50 puerperium women with nipple injuries, hospitalized in the period of June 2002 to July 2003. Participants were randomly assigned into control and experimental groups, by the means of a draw. Statistical analysis was performed using Qui-square, Student's t test, and ANOVA (á at 5%). RESULTS: The size of the injury in the control group reduced in 0.41 ± 0.11 cm (right breast) and 0.29 ± 0.06 cm (left breast) compared to the experimental group, from the first to the second evaluation (p < 0.001), showing to be statistically significant. CONCLUSION: The lanolin is effective in treating nipple injuries.

S208 – Catabolism of Gycoconjugates in Cholesteatoma Tissue

2008 ◽  
Vol 139 (2_suppl) ◽  
pp. P145-P145
Author(s):  
Ewa Olszewska ◽  
Malgorzata Borzym-Kluczyk ◽  
Slawomir Olszewski ◽  
Marek Rogowski
Keyword(s):  
Enzyme Activity ◽  
Statistical Analysis ◽  
Inflammatory Mediators ◽  
T Test ◽  
Relative Importance ◽  
Acquired Cholesteatoma ◽  
Student’S T ◽  
Derivatives Of ◽  
Beta Galactosidase ◽  
Student’S T Test

Objectives 1) To determine the activity of N-acetylo-beta-D-hexosaminidase (HEX), alpha-mannosidase (alpha-MAN) and beta-galactosidase (beta-GAL)in acquired cholesteatoma and normal retroauricular skin specimens. 2) To assess the level of catabolism of glycoconjugates in assays of cholesteatoma extracts, quantifying HEX, alpha-MAN and beta-GAL. Methods Cholesteatomas (n=21) and normal adult post-auricular skin, served as controls(n=21), were collected during surgery in 2006–2007. Exoglycosidases activity was evaluated by determination, the amount of released p-nitrophenol from p-nitrophenol derivatives of appropriate sugars (beta-N-acetylglucosamine, alpha-mannose, and beta-galactose). Statistical analysis was conducted using the Student's t-test; p<0.05 was regarded as significant. Results In 19 of 21 specimens we observed significantly higher activity of investigated enzymes in cholesteatoma tissue compared with control tissue (p<0.05). Mean activity of HEX, alpha-MAN and beta-GAL from the cholesteatoma cells was adequate: 68.55 ±30.77 nkat/g, 1.85 ±1.14 nkat/g and 1.92 ±1.11 nkat/g wet tissue. In the control probes, adequate: HEX: 31.79 ±10.02 nkat/g, alpha-MAN: 0.69 ±0.24 nkat/g and beta-GAL: 0.86±0.22 nkat/g wet tissue. The correlation of two variables: enzyme activity in cholesteatoma and enzyme activity in skin specimens was positive. Pearson's coefficient was equal r= 0.3815 (HEX), r= 0.527 (alpha-MAN) and r= 0.489 (beta-GAL). Conclusions Catabolic reactions involving glycoproteins, glycolipids, and proteoglycans may play a role in the pathogenesis of acquired cholesteatoma. The present data indicating that lysosomal exoglycosidases HEX, alpha-MAN and beta-GAL are significantly and consistently elevated suggest the need to further assess correlations between levels of HEX, alpha-MAN and beta-GAL and cholesteatoma behavior. Further research should also evaluate the relative importance of these particular exoglycosidases in considering the spectrum of identified inflammatory mediators.

scholarly journals Effect of Rehabilitation with a New Ocular Prosthesis on Electromyography of the Occipitofrontalis, Temporal, Masseter, and Sternocleidomastoid

2021 ◽  
Author(s):  
Fernanda Pereira de Caxias ◽  
Karen Letícia Sa Teles ◽  
Daniela Micheline dos Santos ◽  
Clóvis Lamartine de Moraes Melo Neto ◽  
Emily Vivianne Freitas da Silva ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Facial Expressions ◽  
Temporomandibular Disorder ◽  
Good Health ◽  
T Test ◽  
Ocular Prosthesis ◽  
Normal Side ◽  
Significant Difference ◽  
Student’S T ◽  
Student’S T Test

Abstract Objectives The aim of this study was to verify during facial expressions (“happy,” “sad,” “fearful,” “angry,” “surprised,” and “disgusted”) if: (1) there would be difference in the electromyography (EMG) of the occipitofrontalis, temporal, masseter, and sternocleidomastoid muscles on the normal side (NS) compared with the affected side (AS) (without the use of an ocular prosthesis) in individuals with unilateral absence of the eyeball, and (2) the rehabilitation with a new ocular prosthesis would affect the EMG of the muscles studied on the AS in these individuals. Materials and Methods Thirteen individuals, without temporomandibular disorder, with good health, with unilateral absence of the eyeball (the eye must have been removed by evisceration or enucleation), and users or nonusers of an ocular prosthesis were included. EMG of the occipitofrontalis, temporal, masseter, and sternocleidomastoid muscles was performed during rest and facial expressions (“happy,” “sad,” “fearful,” “angry,” “surprised,” and “disgusted”) before (T0) and 90 days after (T1) rehabilitation with a new ocular prosthesis. The analyses were performed in T0 on NS and AS (without the use of an ocular prosthesis), and in T1 on AS with the new ocular prosthesis. Statistical Analysis All data were submitted to the Student's t-test with p < 0.05. Results There was no statistically significant difference comparing the AS with the NS in T0 for all muscles studied, during all facial expressions evaluated (p > 0.05). There was no statistically significant difference comparing the AS in T0 with itself in T1 for all muscles studied, during all facial expressions evaluated (p > 0.05). Conclusion Eye loss did not affect the EMG of studied muscles when comparing NS with AS (without the use of an ocular prosthesis). The rehabilitation with ocular prosthesis was not capable of changing the EMG on AS.

scholarly journals Dentin penetrability evaluation of three different dyes in root-end cavities filled with mineral trioxide aggregate (MTA)

2006 ◽  
Vol 20 (2) ◽  
pp. 132-136 ◽  
Author(s):  
Beatriz Farias Vogt ◽  
Cristina Braga Xavier ◽  
Flávio Fernando Demarco ◽  
Marcio Schüler Padilha
Keyword(s):  
Methylene Blue ◽  
Statistical Analysis ◽  
Silver Nitrate ◽  
Quantitative Evaluation ◽  
Rhodamine B ◽  
Mineral Trioxide Aggregate ◽  
T Test ◽  
Dye Penetration ◽  
Student’S T ◽  
Student’S T Test

The purpose of this study was to evaluate the penetration of three dyes in MTA root-end fillings. In 30 single-rooted teeth, cavities for retrofilling were prepared with an ultrasound appliance and filled with MTA. The specimens were randomly assigned to three groups (n = 10) and immersed in the following solutions: 2% methylene blue (MET), 50% silver nitrate (NIT) and 0.2% rhodamine B (ROD). Two transversal slices (1 mm) of the retrofilling region were obtained and evaluated using the Image Tool 3.0 software to obtain a quantitative evaluation (in mm²) of the dye penetration around the retrofillings. Data were submitted to statistical analysis using Student’s t-test. The lowest degree of dye penetration was observed for the NIT group, in both slices (p < 0.05). Dye penetration was significantly larger in the ROD group when compared to the NIT group, in both slices (p < 0.05), and to the MET group, only in slice 1 (p < 0.05). Within the limitations of this study, it was concluded that the choice of dye could influence the penetration evaluation in root-end filling studies, and that the NIT had the lowest penetration capacity in the apical dentine.

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