Search results

1

The Hierarchical Structure of Selected Morphological and Motoric Variables in Ski Jumping

100%

Jošt B.

Human Movement

|

2010

|

vol. 11

|

issue 2

124-131

EN

Purpose. The main purpose of the present research paper was to establish a hierarchical factor structure in a selected sample of morphological and motor variables of ski jumpers; such variables are base constituents of the potential performance model in ski jumping. Basic procedures. The subject sample was Slovene ski jumpers older than 15 years (n = 72), tested in May 2008. The research was done on a selection of 41 variables (12 basic morphological ones, seven from a special morphological index, 10 basic motoric ones and 12 special dynamic variables of take-off power). Main findings. Through factor analysis in the first phase, nine factors were excluded from the manifest variables of first orders: 1. Factor of velocity power (34.9% of variance); 2. Factor of longitudinal body dimensions (17.2% of variance); 3. Factor of morphological index of flight aerodynamics (12.2% of variance); 4. Factor of morphological index of take-off (7.3% of variance), 5. Factor of push-off explosive power (5.0% of variance), 6. Factor of informatic component of motorics (3.5% of variance); 7. Factor of specific morphological index of thigh dimensions (3.1% of variance), 8. Factor of transversal dimensions of body (2.4% of variance), 9. Factor of flexibility of hips (2.2% of variance). All nine factors of the first order explained 88% of variance of manifest variables. On the basis of configuration of nine factors of the first order in the second phase, four components were excluded from the second order with 62.7% of total variance. The first was component of specific take-off movement (22.9% of variance), followed by component of thigh dimension (14.5% of variance), then component of specific flight potential (13.0% of variance) and finally component of basic morphology (12.1% of variance). On the third level of factor analysis, two general factors of ski jumpers with 57.1% of total variance were found. The first was the general factor of specific movement of ski jumpers (29.8% of variance) and second the general factor of morphology (27.7% of variance). Conclusions. The research confirms the main hypothesis that hierarchical latent factor structures of manifest motor and morphological variables exist. The independent primary factors of the first order are crucial for understanding the latent dimensions of the potential performance model on the second and third level. This factor shows the structure between manifest dimensions more clearly and their relations are more understandable.

2

Phase formation and microstructure in Re1-x CaxBa2Cu3Oz (Re=Y, Eu, Er; x=0, 0.2, 0.3) superconducting ceramics

100%

Stoyanova-Ivanova A. K., Terzieva S. D., Staneva A. D., Mikli V., Traksmaa R., Dimitriev Y. B., Kovachev V. T.

Open Chemistry

|

2006

|

vol. 4

|

issue 1

166-173

EN

We have investigated the influence of Ca-substitution and different rare earths on the microstructure of RE1-x CaxBa2Cu3O7-δ (RE= Y, Eu, Er; x=0, 0.2, 0.3) superconducting ceramics. Scanning electron microscopy, X-ray microanalysis and energy dispersive spectroscopy have been used to study the microstructure and the chemical composition of the samples. A correlation was established between the polycrystalline microstructure and phase formation depending on the additive content. We observed that calcium is distributed uniformly in the crystals. The formation of minor impurity phases improved the sintering conditions.

3

General Anthropometric and Specific Physical Fitness Profile of High-Level Junior Water Polo Players

100%

Kondrič M., Uljević O., Gabrilo G., Kontić D., Sekulić D.

Journal of Human Kinetics

|

2012

|

vol. 32

157-165

EN

The aim of this study was to investigate the status and playing position differences in anthropometric measures and specific physical fitness in high-level junior water polo players.The sample of subjects comprised 110 water polo players (17 to 18 years of age), including one of the world's best national junior teams for 2010. The subjects were divided according to their playing positions into: Centers (N = 16), Wings (N = 28), perimeter players (Drivers; N = 25), Points (N = 19), and Goalkeepers (N = 18). The variables included body height, body weight, body mass index, arm span, triceps- and subscapular-skinfold. Specific physical fitness tests comprised: four swimming tests, namely: 25m, 100m, 400m and a specific anaerobic 4×50m test (average result achieved in four 50m sprints with a 30 sec pause), vertical body jump (JUMP; maximal vertical jump from the water starting from a water polo defensive position) and a dynamometric power achieved in front crawl swimming (DYN).ANOVA with post-hoc comparison revealed significant differences between positions for most of the anthropometrics, noting that the Centers were the heaviest and had the highest BMI and subscapular skinfold. The Points achieved the best results in most of the swimming capacities and JUMP test. No significant group differences were found for the 100m and 4×50m tests. The Goalkeepers achieved the lowest results for DYN.Given the representativeness of the sample of subjects, the results of this study allow specific insights into the physical fitness and anthropometric features of high-level junior water polo players and allow coaches to design a specific training program aimed at achieving the physical fitness results presented for each playing position.

4

RELATIONS OF LATENT ANTHROPOMETRIC DIMENSIONS TO SUCCESS IN JUDO BOUT

100%

Sertić H., Segedi I.

Central European Journal of Sport Sciences and Medicine

|

2014

|

vol. 8

|

issue 4

73-81

EN

The global objective of this research was determining the relations between anthropometric variables with success in judo bout. The research was conducted on a sample of 122 subjects. The sample of variables consisted of 18 anthropometric measures, out of which three latent dimensions were isolated by the use of factor analysis. Three latent dimensions (factors) represent a set of predictive variables. Criterion is defined as a success in judo bout and it is represented by two criteria variables; number of wins and technical efficiency in judo bout. To test the relations of latent anthropometric variables with success in the bout the regression analysis was used. Statistically significant but low connections were found between anthropometric variables and the two criteria. As only the factor volume and mass of the body partially contribute to the explanation of criteria, one can conclude that the active muscle mass is in the background of achieved connection.

5

Effect of Manganese and Iron Content on Morphology of Iron Intermetallic Phases in AlSi7Mg0.3 Alloy

88%

Bolibruchová D., Podprocká R.

Archives of Foundry Engineering

|

2018

|

issue 2

6

Morphological Changes in Two Tobacco and Petunia Cultivars under Exposure to Tropospheric Ozone

88%

Borowiak K.

Acta Biologica Cracoviensia s. Botanica

|

2013

|

vol. 55

|

issue 1

7

Electrical Conductivity and Morphology Study of Polyaniline Powder Synthesised with Various Doping Ions

88%

Golba S., Popczyk M., Miga S., Jurek-Suliga J., Zubek M.

Archives of Metallurgy and Materials

|

2019

|

vol. 64

|

issue 3

8

Interaction of unmodified and partially silylated nanosilica with red blood cells

88%

Gun’ko V., Galagan N., Grytsenko I., Zarko V., Oranska O., Osaulenko V., Bogatyrev V., Turov V.

Open Chemistry

|

2007

|

vol. 5

|

issue 4

951-969

EN

Interaction of red blood cells (RBCs) with unmodified and partially (50%) silylated fumed silica A-300 (nanosilica)was studied by microscopic, XRD and thermally stimulated depolarisation current (TSDC) methods. Nanosilica at a low concentration C A-300C A-300 = 1 wt% all RBCs transform into shadow corpuscles because of 100% haemolysis. Partial (one-half) hydrophobization of nanosilica leads to reduction of the haemolytic effect in comparison with unmodified silica at the same concentrations. A certain portion of the TSDC spectra of the buffered suspensions with RBC/A-300 is independent of the amounts of silica. However, significant portions of the low-and high-temperature TSDC bands have a lower intensity at C A-300 = 1 wt% than that for RBCs alone or RBC/A-300 at C A-300 = 0.01 wt.% because of structural changes in RBCs. Results of microscopic and XRD investigations and calculations using the TSDC-and NMR-cryoporometry suggest that the intracellular structures in RBCs (both organic and aqueous components) depend on nanosilica concentration in the suspension. [...]

9

Characterization of wheat (Triticum aestivum) plant infested by and identification of the African black beetle Heteronychus arator (Fabricius, 1775), a pest attacking wheat in Cameroon

88%

Achiri T. D., Chaba A. F., Nsobinenyui D., Khumbah N. D.

World News of Natural Sciences

|

2024

|

vol. 53

159-168

EN

In a study to investigate the growth and yield performance of wheat varieties, it was observed that some plants showed some leaf yellowing and overall stunted growth. Upon uprooting, some unidentified creamy white larvae were observed. A trial was later conducted to ascertain the extend of infestation by these larvae and eventually identify them using morphological measurements and pictorial comparisons. The study was conducted in the Research farm of the University of Bamenda, Cameroon in 2023. Results revealed that wheat plants infested by the weevil had many yellow leaves and dry old leaves. The roots were severely damaged and the plants did not produce spikes. The infested plants were easy to uproot. Larval and adult infestation rate were 35.0% and 12.5%, respectively. Larval and adult body length were 27.34 mm and 13.21 mm, respectively. The larva and adults were identified as the African Black Beetle ABB Heteronychus arator (Fabricius, 1775) (Coleoptera: Scarabaeidae). Thus, the ABB is reported for the first time as a damaging pest of wheat in Cameroon. Morphological and pictorial identification of the ABB are supported by established keys. The current study ignites research need into management of ABB and its ecological interactions with biotic and abiotic factors.

10

The relationship between morphology and disaccharidase activity in ischemia- reperfusion injured intestine

88%

Varga J., Štefan Tóth J., Tóth Š., Tomečková V., Gregová K., Veselá J.

|

2012

|

vol. 59

|

issue 4

631-638

EN

Background: Questions regarding functional markers characterizing injured intestines remain unanswered. Brush border disaccharidases are crucial for the functioning of the intestines. Aims: The study was designed to assess changes in disaccharidase activity (DA) following intestinal injury and to compare them with morphological changes. Methods: Wistar rats, randomly divided into six experimental groups (each n = 6), were subjected to different ischemic/reperfusion injury. One-hour mesenteric ischemia followed by reperfusion for 0, 1, 2, 4, 12 or 24 hours was induced. As a control group sham-operated animals were used (n = 6). Intestine morphology was evaluated using histopathological injury index (HII) and goblet cell (GC) detection. DA (sucrase and maltase) was studied in mucosal scrape or in entire intestinal wall samples. Results: Moderate morphological damage (HII, GC) after mesenteric ischemia was detected. Deepening of the injury was found during reperfusion with a maximum after two hours. Improved morphology with longer reperfusion confirmed reversible damage with almost normal mucosal structure after 24 hours of reperfusion. Similar pattern was observed when DA was measured. The lowest activity was detected after 2 hours of reperfusion followed by increasing activity in the subsequent reperfusion periods. Physiological values after 24 hours of reperfusion were seen only in samples of entire intestinal wall. Conclusions: Significant changes in intestinal DA were observed after intestinal ischemia/reperfusion injury. A similar pattern was seen for morphological characteristics. Although based on microscopic survey the intestine seems to be fairly regenerated, some functional limitation is expected to persist.

11

INFLUENCE OF CROSSLINKING PROCESS CONDITIONS ON MOLECULAR AND SUPERMOLECULAR STRUCTURE OF CHITOSAN HYDROGEL MEMBRANE

88%

Gierszewska-Drużyńska M., Ostrowska-Czubenko J.

Progress on Chemistry and Application of Chitin and its Derivatives

|

2011

|

vol. 16

15 - 22

EN

Unmodified (Ch) and ionically crosslinked with sodium tripolyphosphate (Ch/TPP) chitosan membranes were prepared. Various crosslinking conditions (pH, crosslinking time) were applied. Differences in membrane molecular structure was examined using FTIR spectroscopy. Scanning electron microscopy (SEM) coupled with Energy Dispersive X-Ray (EDX) Spectrometer as well as atomic force microscopy (AFM) were used for estimation of an effect of crosslinking conditions on supermolecular structure of chitosan membrane. Strong effect of pH of crosslinking TPP solution on crosslinking agent distribution inside the membranes and roughness of membrane surface was found. Differences in membrane morphology prior and after crosslinking results from differences in crosslinking density.

12

CHITOSAN APPLIED FOR GYPSUM MODIFICATION

88%

Mucha M., Mróz P., Wrona D.

|

EN

In order to improve the properties of gypsum materials, including workability, mechanical strength and ability to retain water, various admixtures (also polymers), known as plasticisers, have been applied. These polymers can be soluble in water, such as cellulose and starch ethers, or unsoluble applied in a form of dispersion up to 5% of weight fraction. The admixtures are added into initial water and mixed with hemihydrate calcium sulphate in a proper ratio. In the hydration process of the hemihydrate into dehydrate, a crystallisation process leading to gypsum setting occurs. In the present work, a chitosan sample of DD=85% in two forms was applied: dissolved in 1% acetic acid and as a water dispersion in the weight fraction up to 1% of the gypsum matrix. The water to gypsum ratios of 0.6 or 0.74 was applied. The influence of chitosan on the rate of setting and kinetics of crystallisation of gypsum was investigated and discussed. The morphological structure of the resulting gypsum sample was examined using SEM microscopy. In the presented results, chitosan in the form of a 1% dispersion was a setting retardant and it changed the morphological structure of gypsum. However, mechanical tests showed a decrease of bending strength. When chitosan was applied as a biomaterial, the chitosan content in the composite was equal to 10%, and thus a compressing strength increased. The presence of PVA (polyvinyl alcohol) in the gypsum matrix caused a small effect on gypsum setting in contrast to PVAc (polyvinyl acetate), which is a good admixture for both cement and gypsum [2,3].

13

Laboratory Manual on General and Special Ichthyology

75%

Marenkov O.

World News of Natural Sciences

|

2018

|

vol. 18

|

issue 1

1-51

EN

The manual presents the main methods for studying fish. The general features of the external structure of fish are described: the shape of the body, external organs, the structure and functions of the fins, the types of scales, and the structure of the lateral line. The indicators of morphometric studies of fish with the use of meristic and plastic features according to the classical schemes of measuring fish are also presented. A short description of the statistical method of comparative study of two data samples using the Student's test is given. A method for determining the age of fish by scales is described, as well as a methodology for calculating the annual growth of fish. General information on anatomical structure of fishes is also given. Furthermore, methods of studying the fertility of fish, as well as assessing the nutrition of fish, are described. Particular attention is paid to creating fish preparations: the production of the skeleton of fish, the design of fixed moist preparations and the preparation of a stuffed fish. The presented material has visual illustrations, accompanied by short biological information and forms of tabular material design. The proffered material will be useful for students of the biological and ecological profile, students of natural and agrarian faculties, post-graduate students and young scientists.

14

The effect of thyme and tea tree oils on morphology and metabolism of Candida albicans

75%

Rajkowska K., Kunicka-Styczyńska A., Maroszyńska M., Dąbrowska M.

|

2014

|

vol. 61

|

issue 2

305-310

EN

Members of Candida species cause significant problems in medicine and in many industrial branches also. In order to prevent from Candida sp. development, essential oils are more and more frequently applied as natural, non-toxic, non-pollutive and biodegradable agents with a broad spectrum of antimicrobial activity. The aim of the research was to determine changes in morphology and metabolic properties of Candida albicans in the presence of thyme and tea tree oils. Changes of enzymatic activity of isolates were observed in the presence of both tested essential oils, and they were primarily associated with loss or decrease of activity of all enzymes detected for control. Furthermore, only for 3 out of 11 isolates additional activity of N-acetyl-β-glucosaminidase, α-mannosidase, α-fucosidase and trypsin was detected. Vivid changes in biochemical profiles were found after treatment with tea tree oil and they were related to loss of ability to assimilate d-xylose, d-sorbitol and d-trehalose. The main differences in morphology of isolates compared to the control strain concerned formation of pseudohyphae structures. Both examined essential oils caused changes in cell and colony morphology, as well as in the metabolism of Candida albicans. However, the extent of differences depends on the type and concentration of an essential oil. The most important finding is the broad spectrum of changes in yeast enzymatic profiles induced by thyme and tea tree oils. It can be supposed that these changes, together with loss of ability to assimilate saccharides could significantly impact Candida albicans pathogenicity.

15

Anthropometric and Physical Performance Profiles of Elite Karate Kumite and Kata Competitors

75%

Koropanovski N., Berjan B., Bozic P., Pazin N., Sanader A., Jovanovic S., Jaric S.

Journal of Human Kinetics

|

2011

|

vol. 30

107-114

EN

Karate tournaments consist of two equally important karate disciplines: the kumite and kata competitions. Due to being based both on the distinctive selection of movement techniques and their kinematic and kinetic patterns, we hypothesized that the elite kumite and kata competitors could differ regarding their anthropometric and physical performance profiles. Thirty-one senior male karate competitors of the national karate team (kumite n = 19; kata n = 12) participated in this study. The tests applied included both the assessment of anthropometric (body height, mass and body mass index) and the following physical performance measurements: the adductor and hamstring flexibility (sideward leg splits test), speed and acceleration (20-m sprint test with 10-m acceleration time), explosive power (countermovement and standing triple jump), agility ("T"- test) and aerobic endurance (20-m multistage shuttle run test). The kumite competitors revealed a larger body size through body height (p = 0.01) and mass (p = 0.03), while the differences in body composition were non-significant. The kumite competitors also demonstrated higher acceleration (p = 0.03) and explosive power (standing triple jump; p = 0.03). A 6-7° higher flexibility of the kata competitors remained somewhat below the level of significance (p = 0.09). The findings could be interpreted by the distinctive differences in the movement techniques. Specifically, a higher explosive power could be beneficial for kumite, while both a smaller stature and higher flexibility (particularly of the lower extremity) could be important for the exceptionally low postures of the kata competitors. Although further elucidation is apparently needed, the obtained finding could be of importance for both the early selection and training of karate competitors.

16

Analysis of Experts’ Quantitative Assessment of Adolescent Basketball Players and the Role of Anthropometric and Physiological Attributes

75%

Štrumbelj E., Erčulj F.

Journal of Human Kinetics

|

2014

|

vol. 42

|

issue 1

267-276

EN

In this paper, we investigated two questions: (1) can measurements of anthropometric and physiological attributes substitute for expert assessment of adolescent basketball players, and (2) how much does the quantitative assessment of a player vary among experts? The first question is relevant to the potential simplification of the player selection process. The second question pertains directly to the validity of expert quantitative assessment. Our research was based on data from 148 U14 female and male basketball players. For each player, an array of anthropometric and physiological attributes was recorded, including body height, body mass, BMI, and several motor skill tests. Furthermore, each player's current ability and potential ability were quantitatively evaluated by two different experts from a group of seven experts. Analysis of the recorded data showed that the anthropometric and physiological attributes explained between 15% and 40% of the variance in experts’ scores. The primary predictive attributes were speed and agility (for predicting current ability) and body height and growth potential (for predicting potential ability). We concluded that these attributes were not sufficiently informative to act as a substitute for expert assessment of the players’ current or potential ability. There is substantial variability in different experts' scores of the same player’s ability. However, the differences between experts are mostly in scale, and the relationships between experts’ scores are monotonic. That is, different experts rank players on ability very similarly, but their scores are not well calibrated.

17

Microtomography in morphological studies of small invertebrates

75%

Nesteruk T., Wiśniewski Ł.

Teka Komisji Ochrony i Kształtowania Środowiska Przyrodniczego

|

2015

|

vol. XII

18

Life cycle of Branchinecta gaini Daday, 1910, (Branchiopoda, Anostraca) from King George Island, South Shetland Islands

75%

Jurasz W., Kittel W., Presler P., Jurasz W., Kittel W., Presler P.

|

issue 1-4

19

Influence of mechanical alloying process on structural, mechanical and tribological behaviours of CNT reinforced aluminium composites – a statistical analysis

75%

Manikandan P., Elayaperumal A., Franklin Issac R., Manikandan P., Elayaperumal A., Franklin Issac R.

|

2021

20

New Ultrastructural and Physiological Features of the Thallus in Antarctic Lichens

63%

Olech M., Giełwanowska I.

Acta Biologica Cracoviensia s. Botanica

|

2012

|

vol. 54

|

issue 1

Refine search results

The Hierarchical Structure of Selected Morphological and Motoric Variables in Ski Jumping

Phase formation and microstructure in Re1-x CaxBa2Cu3Oz (Re=Y, Eu, Er; x=0, 0.2, 0.3) superconducting ceramics

General Anthropometric and Specific Physical Fitness Profile of High-Level Junior Water Polo Players

RELATIONS OF LATENT ANTHROPOMETRIC DIMENSIONS TO SUCCESS IN JUDO BOUT

Effect of Manganese and Iron Content on Morphology of Iron Intermetallic Phases in AlSi7Mg0.3 Alloy

Morphological Changes in Two Tobacco and Petunia Cultivars under Exposure to Tropospheric Ozone

Electrical Conductivity and Morphology Study of Polyaniline Powder Synthesised with Various Doping Ions

Interaction of unmodified and partially silylated nanosilica with red blood cells

Characterization of wheat (Triticum aestivum) plant infested by and identification of the African black beetle Heteronychus arator (Fabricius, 1775), a pest attacking wheat in Cameroon

The relationship between morphology and disaccharidase activity in ischemia- reperfusion injured intestine

INFLUENCE OF CROSSLINKING PROCESS CONDITIONS ON MOLECULAR AND SUPERMOLECULAR STRUCTURE OF CHITOSAN HYDROGEL MEMBRANE

CHITOSAN APPLIED FOR GYPSUM MODIFICATION

Laboratory Manual on General and Special Ichthyology

The effect of thyme and tea tree oils on morphology and metabolism of Candida albicans

Anthropometric and Physical Performance Profiles of Elite Karate Kumite and Kata Competitors

Analysis of Experts’ Quantitative Assessment of Adolescent Basketball Players and the Role of Anthropometric and Physiological Attributes

Microtomography in morphological studies of small invertebrates

Life cycle of Branchinecta gaini Daday, 1910, (Branchiopoda, Anostraca) from King George Island, South Shetland Islands

Influence of mechanical alloying process on structural, mechanical and tribological behaviours of CNT reinforced aluminium composites – a statistical analysis

New Ultrastructural and Physiological Features of the Thallus in Antarctic Lichens