Relationship of sap sugar concentrations in sugar maple to ray tissue and parenchyma flecks caused by Phytobiasetosa

1980 ◽  
Vol 10 (3) ◽  
pp. 312-315 ◽  
Author(s):  
William E. Wallner ◽  
Robert A. Gregory
Keyword(s):  
Sugar Maple ◽  
Tree Height ◽  
Tree Crown ◽  
Significant Difference ◽  
Sugar Levels ◽  
Relationship Of ◽  
Root Collar

Sap sugar levels were determined for 300 sugar maple, Acersaccharum Marsh, trees. The 10 trees highest and lowest in sap sugar were sacrificed and attempts were made to calculate abundance and size of parenchyma flecks caused by Phytobiasetosa (Loew) and ray tissue per unit of xylem. Flecks occurred in up to 0.2% of the xylem, but there was no significant difference between fleck number or xylem-fleck ratio and sap sugar levels. Fleck numbers decreased with tree height; largest flecks were observed at the root collar and 8–12 m from the ground. This suggests that all P. setosa larvae do not mine from twigs in the crown to the roots, but that some mature and exit at the base of the tree crown. Trees high in sap sugar had significantly more ray tissue per unit of xylem than those low in sap sugar, a major factor in determining sap sugar concentrations.

scholarly journals Effects of Differences in Structure from Motion Software on Image Processing of Unmanned Aerial Vehicle Photography and Estimation of Crown Area and Tree Height in Forests

2021 ◽  
Vol 13 (4) ◽  
pp. 626
Author(s):  
Shohei Kameyama ◽  
Katsuaki Sugiura
Keyword(s):  
Image Processing ◽  
Structure From Motion ◽  
Statistical Significance ◽  
Tree Height ◽  
Point Clouds ◽  
Aerial Images ◽  
Tree Crown ◽  
Crown Area ◽  
Canopy Area ◽  
Significant Difference

This study examines the effects of differences in structure from motion (SfM) software on image processing of aerial images by unmanned aerial vehicles (UAV) and the resulting estimations of tree height and tree crown area. There were 20 flight conditions for the UAV aerial images, which were a combination of five conditions for flight altitude, two conditions for overlap, and two conditions for side overlap. Images were then processed using three SfM programs (Terra Mapper, PhotoScan, and Pix4Dmapper). The tree height and tree crown area were determined, and the SfM programs were compared based on the estimations. The number of densified point clouds for PhotoScan (160 × 105 to 50 × 105) was large compared to the two other two SfM programs. The estimated values of crown area and tree height by each SfM were compared via Bonferroni multiple comparisons (statistical significance level set at p < 0.05). The estimated values of canopy area showed statistically significant differences (p < 0.05) in 14 flight conditions for Terra Mapper and PhotoScan, 16 flight conditions for Terra Mapper and Pix4Dmapper, and 11 flight conditions for PhotoScan and Pix4Dmappers. In addition, the estimated values of tree height showed statistically significant differences (p < 0.05) in 15 flight conditions for Terra Mapper and PhotoScan, 19 flight conditions for Terra Mapper and Pix4Dmapper, and 20 flight conditions for PhotoScan and Pix4Dmapper. The statistically significant difference (p < 0.05) between the estimated value and measured value of each SfM was confirmed under 18 conditions for Terra Mapper, 20 conditions for PhotoScan, and 13 conditions for Pix4D. Moreover, the RMSE and rRMSE values of the estimated tree height were 5–6 m and 20–28%, respectively. Although the estimation accuracy of any SfM was low, the estimated tree height by Pix4D in many flight conditions had smaller RMSE values than the other software. As statistically significant differences were found between the SfMs in many flight conditions, we conclude that there were differences in the estimates of crown area and tree height depending on the SfM used. In addition, Pix4Dmapper is suitable for estimating forest information, such as tree height, and PhotoScan is suitable for detailed monitoring of disaster areas.

scholarly journals Effects of habitat edges on vegetation structure and the vulnerable golden-brown mouse lemur (Microcebus ravelobensis) in northwestern Madagascar

BMC Ecology ◽  
2020 ◽  
Vol 20 (1) ◽  
Author(s):  
Bertrand Andriatsitohaina ◽  
Daniel Romero-Mujalli ◽  
Malcolm S. Ramsay ◽  
Frederik Kiene ◽  
Solofonirina Rasoloharijaona ◽  
...  
Keyword(s):  
Body Mass ◽  
Edge Effects ◽  
Vegetation Structure ◽  
Species Abundance ◽  
Tree Height ◽  
Logistic Function ◽  
Study Region ◽  
Large Trees ◽  
Significant Difference ◽  
Vegetation Parameters

Abstract Background Edge effects can influence species composition and community structure as a result of changes in microenvironment and edaphic variables. We investigated effects of habitat edges on vegetation structure, abundance and body mass of one vulnerable Microcebus species in northwestern Madagascar. We trapped mouse lemurs along four 1000-m transects (total of 2424 trap nights) that ran perpendicular to the forest edge. We installed 16 pairs of 20 m2 vegetation plots along each transect and measured nine vegetation parameters. To determine the responses of the vegetation and animals to an increasing distance to the edge, we tested the fit of four alternative mathematical functions (linear, power, logistic and unimodal) to the data and derived the depth of edge influence (DEI) for all parameters. Results Logistic and unimodal functions best explained edge responses of vegetation parameters, and the logistic function performed best for abundance and body mass of M. ravelobensis. The DEI varied between 50 m (no. of seedlings, no. of liana, dbh of large trees [dbh ≥ 10 cm]) and 460 m (tree height of large trees) for the vegetation parameters, whereas it was 340 m for M. ravelobensis abundance and 390 m for body mass, corresponding best to the DEI of small tree [dbh < 10 cm] density (360 m). Small trees were significantly taller and the density of seedlings was higher in the interior than in the edge habitat. However, there was no significant difference in M. ravelobensis abundance and body mass between interior and edge habitats, suggesting that M. ravelobensis did not show a strong edge response in the study region. Finally, regression analyses revealed three negative (species abundance and three vegetation parameters) and two positive relationships (body mass and two vegetation parameters), suggesting an impact of vegetation structure on M. ravelobensis which may be partly independent of edge effects. Conclusions A comparison of our results with previous findings reveals that edge effects are variable in space in a small nocturnal primate from Madagascar. Such an ecological plasticity could be extremely relevant for mitigating species responses to habitat loss and anthropogenic disturbances.

scholarly journals MUC1 and MUC5AC Acting on Helicobacter pylori-Related Deficiency and Solid Syndrome of Spleen and Stomach

2018 ◽  
Vol 2018 ◽  
pp. 1-8
Author(s):  
Ling Hu ◽  
Wanqun Chen ◽  
Ming Cheng ◽  
Ting Zhang ◽  
Shaoyang Lan ◽  
...  
Keyword(s):  
Helicobacter Pylori ◽  
Dynamic Equilibrium ◽  
Deficiency Syndrome ◽  
Blue Staining ◽  
Significant Difference ◽  
Tai Ji ◽  
Hematoxylin And Eosin ◽  
Relationship Of ◽  
Heat Syndrome ◽  
The Relationship

To investigate the relationship of MUC1, MUC5AC, and the syndrome of spleen and stomach, 109 subjects (34 peptic ulcer (PU), 62 chronic gastritis (CG), and 13 healthy volunteers (CON)) were included. All the subjects included were surveyed with questionnaire to classify them into damp-heat syndrome of spleen and stomach (DHSS), spleen-qi deficiency syndrome (SQD), and CON, examined by gastric endoscope, and biopsied. Rapid urease and methylene blue staining (MBS) were performed on every subject to diagnose for Helicobacter pylori (Hp) infection, and both were defined as Hp-positive. Hematoxylin and eosin (HE) staining was performed on every specimen to explore the histomorphology, inflammatory degree, and inflammatory activity of different groups; then Elivision™ plus kit was used to test the expression of MUC1 and MUC5AC. All the results of digital images were reviewed by two experts blindly. The inflammatory degree with Hp infection was higher than those uninfected or CON, but no significant difference was found between DHSS and SQD. And the expressions of MUC5AC with positive Hp was higher than those with negative Hp or CON regardless of the deficiency and solid syndrome of spleen-stomach but not for MUC1. We speculate that the deficiency and solid syndrome of spleen-stomach is a condition like Tai Ji symbol of dynamic equilibrium, showing the higher expression of MUC5AC but no change of MUC1 in the circumstance of Hp infection.

scholarly journals Chronic Venous Insufficiency (CVI) - A Study of 100 Cases

1970 ◽  
Vol 9 (1) ◽  
pp. 20-26
Author(s):  
MM Shahin-Ul-Islam ◽  
Md Zahirul Haque ◽  
Saki Md Jakiul Alam ◽  
Mesbahuddin Noman ◽  
FM Siddiqui
Keyword(s):  
Chronic Venous Insufficiency ◽  
Venous Insufficiency ◽  
Leg Pain ◽  
Advanced Stage ◽  
College Hospital ◽  
Prolonged Standing ◽  
Burning Pain ◽  
Significant Difference ◽  
Ceap Classification ◽  
Relationship Of

This study was carried out in the out patient department of Dhaka Medical College Hospital. 100 patients presented with chronic venous insufficiency during the period of January 2005 to June 2005 were studied to find out the various modes of presentation, risk factors and relationship of symptoms with age, sex and Body Mass Index of the patients. It was found that, maximum patients presented with heaviness in the leg (87%), followed by aching leg pain (75%), leg swelling (70%), cramping leg pain (68%), tiredness (48%), burning pain (43%), engorged leg vein (39%), restless leg at night (21%), throbbing leg pain (18%), itching (13%), various skin changes without active ulceration (7%) and active leg ulceration only 3% of cases. Increasing age of the patients, obesity, increasing number of pregnancy, prolonged standing and sitting position at work were found to be positively correlated with CVI. Advanced age is associated with more advanced stage of CVI according to clinical CEAP classification. There is almost equal sex distribution among the stages of CVI except in advanced stage, in stage C4, C5 and C6 there is 10 patients out of them 9 are male and only 1 is female. Relationship of symptoms with BMI of the patients were also sort out and found that, in C3 group of CEAP classification out of 61 patients 46 are obese according to BMI, of which 32 are female and 14 are male and only 17 patients have BMI within normal range, but in other group there is no significant difference in incidence between two groups.   DOI = 10.3329/jom.v9i1.1421 J MEDICINE 2008; 9 : 20-26

scholarly journals Effect Of Modular Distance Learning Approach To Academic Performance In Mathematics Of Students In Mindanao State University-Sulu Senior High School Amidst Covid-19 Pandemic

2021 ◽  
Vol 4 (2) ◽  
pp. 407-430
Author(s):  
Jainalyn Annong Aksan
Keyword(s):  
High School ◽  
Academic Performance ◽  
Distance Learning ◽  
Senior High School ◽  
Learning Approach ◽  
Gender And Age ◽  
Significant Difference ◽  
Stem Students ◽  
Relationship Of ◽  
Grade 11

The existence of COVID-19 pandemic brought extraordinary challenges to the stakeholders, teachers, parents, and students. Thus, the researcher believed that there is an effect of teaching-learning process in new normal education to students’ performance most especially using modular type of learning in Mathematics. With this, the study sought to determine the perception of the students regarding modular distance learning approach (MDLA) in Mathematics, identify the challenges of the students, examine the effect of MDLA to academic performance of students in Mathematics, determine the level of academic performance of students, determine the significant difference on perceptions when they grouped according to their gender and age, and determine the relationship of students’ perceptions regarding MDLA to their academic performance in Mathematics. The descriptive research design was utilized in this study. The researcher gathered one hundred seventy eight (178) grade 11 STEM students currently enrolled in MSU-Sulu Senior High School through the use of purposive random sampling. The survey questionnaire was applied in the study. Mean, frequency counts and percentage, t-test for independent samples, one-way analysis of variance (ANOVA), and person product-moment correlation were used to analyze and interpret the data. Based on the result, the study revealed that students’ perceptions agreed on using modular distance learning approach (MDLA). It means the students had positive perceptions regarding MDLA in Mathematics. The study also revealed that students agreed on using modular distance learning approach (MDLA) in Math have little challenges. It had also a positive effect to students’ performance in which students performed very satisfactory in Mathematics which means they had good quality performance. However, the study also revealed that it has no significant difference on their perceptions when they are grouped by gender and age which means the students had the same perceptions. Moreover, the findings revealed that there is no enough evidence to conclude that there is significant relationship of the students’ perceptions to the academic performance of the STEM grade 11 students using the new method of teaching modular distance learning approach (MDLA) amid COVID-19 pandemic. Therefore, the researcher concluded that the academic performances of STEM students were not affected by their perceptions in MDLA. This means that the quality of performance did not depend on their perceptions. And the researcher also concluded that this approach helped students to improve their math performance. Since it proved that this approach improved the mathematical understanding and helped the students to have good performance then the researcher recommended that MDLA must be continued in face-to-face instruction and highly recommended to use modules. Teachers guided those who need special attention and need to prepare easy type of modules in Mathematics to understand well. Any member of the family can help to guide and serve as para-teachers. Trainings, workshops, and seminars should be provided to the teachers to improve themselves and academic performances of the students.

scholarly journals Crown structure of Picea omorika trees in the plantation

2012 ◽  
Vol 64 (2) ◽  
pp. 605-611 ◽  
Author(s):  
M. Krstic ◽  
N. Stavretovic ◽  
V. Isajev ◽  
I. Bjelanovic
Keyword(s):  
Tree Height ◽  
Tree Crown ◽  
Crown Length ◽  
Crown Structure ◽  
Parabolic Function ◽  
Picea Omorika ◽  
Serbian Spruce ◽  
The Relationship ◽  
Total Tree ◽  
Stand Conditions

The study was carried out in Serbian spruce (Picea omorika Panc/Purkyn?) plantations in the western Serbia. The paper presents results of the analysis of crown development. The following elements were analyzed: total tree height, height of the crown base, absolute and relative crown length, maximal crown diameter, coefficient of crown spreading and degree of crown girth. We discuss approaches to the modeling of tree crown growth and development, growing under favorable environmental and stand conditions, without anomalies in development. In order to establish the relationship between analyzed factors, regression analyses were applied. Data fitting was by the analytic method, by the implementation of Prodan?s functions of growth, linear and parabolic function. Received models can be used for the simulation of various growth and developing processes in forest.

scholarly journals Comparison between Steiner cephalometric and modified Andrews photometric method for assessing antero-posterior position of the maxillary central incisors.

2019 ◽  
Vol 147 (11-12) ◽  
pp. 670-675
Author(s):  
Predrag Vucinic ◽  
Djordje Petrovic ◽  
Stojan Ivic ◽  
Sanja Vujkov
Keyword(s):  
Vertical Line ◽  
Photometric Method ◽  
Facial Features ◽  
Tooth Position ◽  
Facial Esthetics ◽  
Lateral Cephalograms ◽  
Significant Difference ◽  
Low Levels ◽  
Relationship Of ◽  
Posterior Position

Introduction/Objective. Maxillary incisors, when exposed during smile, are one of the most important facial features. In an attempt to overcome limitations of standard cephalometric methods, Andrews described an approach to determine ideal anteroposterior (AP) position of maxillary central incisors in smiling profile in relation to the forehead. We compared traditional Steiner cephalometric method, using surrounding skeletal landmarks, to the method proposed by Andrews, with the aim of determining whether distant but very noticeable craniofacial structures can affect our impression of tooth position. Methods. The study comprised 90 randomly selected lateral cephalograms, divided into three groups according to maxillary central incisors AP position according to Steiner cephalometric norms. The AP relationship of the maxillary central incisors was measured as a perpendicular distance from facial axis point to the nasion A line and to the vertical line through forehead facial axis point respectively. Student?s t-test and Pearson?s correlation were used to compare tested variables. Results. There was statistically significant difference between two methods (p = 0.01108). According to the Steiner method 46.67% subjects had retrusive incisors and 53.33% subjects had protrusion. Andrews?s method showed different results; 35.56% subjects had retrusion, while 64.4% had protrusion. Conclusion. The method proposed by Andrews showed consistently more protrusion than the traditional cephalometric method according to Steiner. Slightly retruded position of maxillary central incisors according to Steiner analysis does not always imply poor facial esthetics, if they have favorable position to the forehead. Low levels of correlation indicate that we should never rely on just one set of parameters.

scholarly journals The Relationship of Surgeon Handedness and Experience on Operative Duration and Hearing Improvement in Ipsilateral and Contralateral Otologic Surgeries

2020 ◽  
Vol 35 (2) ◽  
pp. 17
Author(s):  
Gillian Barzaga
Keyword(s):  
Hearing Improvement ◽  
Ear Surgery ◽  
Hearing Gain ◽  
Operative Duration ◽  
Left Handed ◽  
Significant Difference ◽  
Surgeon Experience ◽  
The Right ◽  
Relationship Of ◽  
The Relationship

ABSTRACT Objective: To determine the relationship of the surgeon handedness and operative site laterality on operative duration and hearing improvement in otologic surgery, and to further explore whether this relationship may be related to surgeon experience. Methods:Design: Retrospective CohortSetting: Tertiary Private Teaching HospitalParticipants: Seventy-three (73) patients aged 18 to 65 years old who underwent primary ear surgery under general anesthesia between January 2016 and December 2019 were retrospectively divided into two groups: 39 contralateral and 34 ipsilateral. The operative durations and hearing improvements were compared using independent t-tests, with consideration of surgeon experience in years further stratifying patients. Results: There was no significant difference in operative duration, t(71) = 1.14, p = .26, between the contralateral (M = 281.95 minutes, SD = 71.82) and ipsilateral (M = 261.15, SD = 79.26) groups. This same pattern was more pronounced among surgeons with 10+ years of experience although there was also no significant difference in operative time, t(33) = 1.31, p = .19 for both ipsilateral and contralateral surgeries There was no statistically significant difference, t(36) = -0.72, p = .47, in overall mean hearing gain among patients in the contralateral (M = +2.22 dB, SD = 10.54) and ipsilateral (M = +5.12 dB, SD = 14.26) groups. Although the difference was also not statistically significant, t(16) = -1.94, p = .07 for contralateral (M = 0.00, SD = 5.43) and ipsilateral (M = +7.95 dB, SD = 11.52) procedures performed by surgeons with experience of 10 years or more, a mean hearing gain of +7 dB in the ipsilateral group compared to 0 dB in the contralateral group was notable. Conclusion: This study did not prove that regardless of surgeon experience, right-handed surgeons operating on the right ear and left-handed surgeons operating on the left ear have better ear surgery outcomes of operative duration and hearing improvement compared to right- handed surgeons operating on the left ear and left-handed surgeons operating on the right ear. Future studies on larger samples with more complete data may yet demonstrate this effect.

scholarly journals Sodium Status and Its Association with Overweight and Obesity in Adults Living in Yazd, Iran

2019 ◽  
Author(s):  
Abolfazl Dashti- Rahmat Abadi ◽  
Hassan Mozaffari- Khosravi ◽  
Mahdieh Nemayandeh ◽  
Mohammad Hosein Soltani ◽  
Masoud Mirzaei ◽  
...  
Keyword(s):  
Sodium Excretion ◽  
Smoking Status ◽  
Urinary Sodium Excretion ◽  
Overweight And Obesity ◽  
Urinary Sodium ◽  
Health Study ◽  
Significant Difference ◽  
History Of ◽  
The Mean ◽  
Relationship Of

Background: Studies on the relationship of urinary sodium with overweight and obesity led to controversial results. Furthermore, no study has ever investigated the association between sodium status and obesity in Iranian adults. The present study examined the association of urinary sodium levels with overweight and obesity in adults living in Yazd, Iran. Methods: The present study recruited 240 adults randomly selected from adults, who participated in Yazd Health Study (YaHS). A 24-hour urine sample was collected from the participants. Participants' demographic information, history of chronic diseases, and smoking status were obtained. The height and weight of the participants were also assessed using standard methods. We compared the weight and body mass index (BMI) of the participants based on the urinary sodium excretion tertiles. The logistic regression model in crude and multivariable adjusted models was used to compare the odds of obesity between urinary sodium tertiles. Results: The findings showed that the mean urinary sodium was not significantly different among overweight, obese, and individuals with normal BMI (P > 0.05) using the crude and multivariable models. Furthermore, no significant difference was observed in the mean BMI according to urinary sodium excretion tertiles. In addition, the analyses showed that the sodium status was not significantly associated with odds of developing obesity in crude and in multivariable adjusted models. Conclusion: No significant relationship was seen between sodium status and overweight or obesity. Future prospective studies are highly recommended to confirm these results.

Application and comparison of spatial models in analyzing tree-genetics field trials

1990 ◽  
Vol 20 (5) ◽  
pp. 536-546 ◽  
Author(s):  
Steen Magnussen
Keyword(s):  
Classical Model ◽  
Substantial Reduction ◽  
Spatial Models ◽  
Tree Height ◽  
Process Models ◽  
Spatial Process ◽  
Spatial Analyses ◽  
Spatial Covariance ◽  
Significant Difference ◽  
Tree Genetics

Tree height of jack pine full-sib families, originating from all possible combinations of three parental provenances and growing on three sites, was analyzed with 1 classical model and 11 nearest-neighbour spatial process models. Extension of the classical linear model with spatial interaction terms was deemed necessary in light of significant neighbourhood correlations among effect-free observations (residuals) on two of the three sites. The strength and extent of spatial and temporal correlations are demonstrated in both visual and tabular form. Only 4 of the 11 spatial models provided a substantial reduction (5–20%) in the significant difference between two estimates of full-sib family tree height. Spatial adjustments averaged 1–3% at the family level, with few families adjusted by more than 10%. The cumulative (temporal) effect of spatial covariance was demonstrated in rank correlations between adjusted and observed family means. No simple trends were obtained when adjusted variance components and heritabilities were compared with their unadjusted counter-parts, but most models tended to deflate genetic effects and reduce heritabilities. It is concluded that although spatial analyses provide an attractive tool for the experimenter, the lack of a cause and effect hypothesis in forest genetic trials necessitates model searching without the guarantee of true treatment effects. Spatial analysis provides good indicators of the need to collect additional site information for more powerful analyses. Careful planning and intensive site preparation may greatly reduce spatial covariances and the need for spatial analyses.

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