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Letteratura scientifica selezionata sul tema "Maturation"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 7 luglio 2024

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Articoli di riviste sul tema "Maturation"

Boeyer, Melanie E., Emily V. Leary, Richard J. Sherwood e Dana L. Duren. "Evidence of the non-linear nature of skeletal maturation". Archives of Disease in Childhood 105, n. 7 (23 gennaio 2020): 631–38. http://dx.doi.org/10.1136/archdischild-2019-317652.

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ObjectiveThe aim of this study was to assess longitudinal trajectories of skeletal maturation to determine if children exhibit periods of rapid maturation during normal childhood and adolescence.DesignRetrospective longitudinal study. Patients: 345 participants, with an average of 25 assessments per participant, between 3 and 20 years of age from the Fels Longitudinal Study.Main outcome measuresChronological age (ie, timing) and rate (ie, tempo) of skeletal maturation, as assessed by the Fels Method, at each maturational milestone, as well as the duration of time spent between any two milestones, were calculated for each participant-specific maturational trajectory and compared between three unique, non-linear maturational trajectory types.ResultsMore than 81% of participants exhibited a rapid period of skeletal maturation during childhood and/or adolescence, most of whom were characterised by a single maturational spurt during adolescence. Participants with only a single adolescent spurt in skeletal maturation reach adolescent onset and peak approximately 2.8 and 4.2 years earlier, respectively, in boys (p<0.001) and girls (p<0.001), than when compared with participants with both childhood and adolescent spurts. Differences in the timing and tempo of maturational milestones were driven primarily by trajectory type.ConclusionsRapid changes in skeletal maturation occur during normal childhood and/or adolescence, indicating the presence of a maturational spurt: a developmental phenomenon that has remained largely uncharacterised. This work highlights patterned changes in the timing, tempo and duration of longitudinal skeletal maturation while simultaneously shifting the paradigm that skeletal maturation progresses linearly.

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Flor-Cisneros, Armando, Ellen W. Leschek, Deborah P. Merke, Kevin M. Barnes, Marilena Coco, Gordon B. Cutler e Jeffrey Baron. "In Boys with Abnormal Developmental Tempo, Maturation of the Skeleton and the Hypothalamic-Pituitary-Gonadal Axis Remains Synchronous". Journal of Clinical Endocrinology & Metabolism 89, n. 1 (1 gennaio 2004): 236–41. http://dx.doi.org/10.1210/jc.2002-021954.

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The primary mechanism that initiates puberty is unknown. One possible clue is that pubertal maturation often parallels skeletal maturation. Conditions that delay skeletal maturation also tend to delay the onset of puberty, whereas conditions that accelerate skeletal maturation tend to hasten the onset of puberty. To examine this relationship, we studied boys with congenital adrenal hyperplasia (n = 13) and familial male-limited precocious puberty (n = 22), two conditions that accelerate maturational tempo, and boys with idiopathic short stature (n = 18) in which maturational tempo is sometimes delayed. In all three conditions, the onset of central puberty generally occurred at an abnormal chronological age but a normal bone age. Boys with the greatest skeletal advancement began central puberty at the earliest age, whereas boys with the greatest skeletal delay began puberty at the latest age. Furthermore, the magnitude of the skeletal advancement or delay matched the magnitude of the pubertal advancement or delay. This synchrony between skeletal maturation and hypothalamic-pituitary-gonadal axis maturation was observed among patients within each condition and also between conditions. In contrast, the maturation of the hypothalamic-pituitary-gonadal axis did not remain synchronous with other maturational processes including weight, height, or body mass index. We conclude that in boys with abnormal developmental tempo, maturation of the skeleton and the hypothalamic-pituitary-gonadal axis remains synchronous. This synchrony is consistent with the hypothesis that in boys, skeletal maturation influences hypothalamic-pituitary-gonadal axis maturation.

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Yoneda, Michio, Masayuki Yamamoto, Tetsuo Yamada, Makoto Takahashi e Yasuhiro Shima. "Temperature-induced variation in sexual maturation of Japanese anchovy Engraulis japonicus". Journal of the Marine Biological Association of the United Kingdom 95, n. 6 (10 aprile 2015): 1271–76. http://dx.doi.org/10.1017/s0025315415000405.

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Temperature is one of the most influential factors for the sexual maturation of fishes, but understanding of the extent to which temperature affects the maturational schedules is limited in multiple-spawning fishes over a protracted season. This study examined the effect of temperature on sexual maturation of Japanese anchovy Engraulis japonicus siblings under high and low temperature regimes on different birthdates. The maturation probability differed between the two temperature regimes. Specimens in high temperature regimes matured at much smaller size and younger age than their counterparts. Also, a significant difference in the maturation probability between sexes was found at low temperatures, but not at high temperatures. Our findings show that temperature affects the maturational schedules of siblings of Japanese anchovy, suggesting that the size and age at sexual maturation could differ among cohorts, even in a given sampling location and/or year.

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GUINNEE, M. A., A. W. GEMMILL, B. H. K. CHAN, M. E. VINEY e A. F. READ. "Host immune status affects maturation time in two nematode species – but not as predicted by a simple life-history model". Parasitology 127, n. 5 (17 ottobre 2003): 507–12. http://dx.doi.org/10.1017/s0031182003003998.

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In theory, the age at which maturation occurs in parasitic nematodes is inversely related to pre-maturational mortality rate, and cross-species data on mammalian nematodes are consistent with this prediction. Immunity is a major source of parasite mortality and parasites stand to gain sizeable fitness benefits through short-term adjustments of maturation time in response to variation in immune-mediated mortality. The effects of thymus-dependent immune responses on maturation in the nematode parasites Strongyloides ratti and Nippostrongylus brasiliensis were investigated using congenitally thymus-deficient (nude) rats. As compared with worms in normal rats, reproductive maturity of parasites (presence of eggs in utero) in nude rats occurred later in S. ratti but earlier in N. brasiliensis. Immune-mediated differences in maturation time were not associated with differences in worm length. Thymus-dependent immunity had no effect on pre-maturational mortality. Results are discussed in relation to theoretical expectations and possible explanations for the observed patterns in parasite maturation.

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Yu, Dayeol, e Donghyun Kim. "Assessment of Midpalatal Suture Maturation by Skeletal Maturity on Hand Wrist Radiographs". JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY 48, n. 1 (28 febbraio 2021): 31–41. http://dx.doi.org/10.5933/jkapd.2021.48.1.31.

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The aim of this retrospective study was to evaluate the correlation between the midpalatal suture maturation and skeletal maturation in growing children aged 7 - 15 years and predict the maturational stages of the midpalatal suture corresponding to skeletal maturity assessed by the skeletal maturation indicators (SMI) and middle phalanx of the third finger (MP3) stages. The group of this retrospective study was consisted of randomly selected 132 male and 135 female in age from 7 - 15 years. The maturation of the midpalatal suture was evaluated by using images from cone-beam computed tomography (CBCT) while the skeletal age was assessed by hand-wrist radiography. CBCT images and hand-wrist radiographs used in this study were obtained from all subjects for orthodontic diagnosis before orthodontic treatment. The maturational stages of the midpalatal suture showed strong correlations with both SMI and MP3 stages. The correlation between the midpalatal suture maturation and SMI (Spearman’s correlation coefficient, ϒS = 0.905, p < 0.05) was slightly greater than that of MP3 stages (ϒS = 0.830, p < 0.05). There was a positive significant correlation between the midpalatal suture maturation and chronological age (ϒS = 0.868,p < 0.05). CBCT for evaluation of the midpalatal suture maturational stages may be unnecessary in every pediatric patients because SMI and MP3 stages were both replaceable useful methods for assessing maturation of the midpalatal suture before orthopedic treatment. In this retrospective study, the diagnostic reliability of the SMI method for estimating midpalatal suture maturation showed better reliability than the MP3 method.

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Albaladejo-Saura, Mario, Raquel Vaquero-Cristóbal, Noelia González-Gálvez e Francisco Esparza-Ros. "Relationship between Biological Maturation, Physical Fitness, and Kinanthropometric Variables of Young Athletes: A Systematic Review and Meta-Analysis". International Journal of Environmental Research and Public Health 18, n. 1 (5 gennaio 2021): 328. http://dx.doi.org/10.3390/ijerph18010328.

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There is a growing interest in knowing the relationship between biological maturation and sport performance-related variables of young athletes. The objective of this study is to analyze the relationship between biological maturation, physical fitness, and kinanthropometric variables of athletes during their growing period, according to their sex. The systematic review and meta-analysis followed the Preferred Reporting Items for Systematic Review and Meta-Analysis (PRISMA) statement and the search protocol was registered in PROSPERO, code: CRD42020208397. A search through the PubMed, Web of Sciences, and EBSCO databases was performed. A total of 423 studies were screened and 13 were included in the meta-analysis. The meta-analysis was completed by using the mean and standard deviation of each variable according to each maturation status (early, on time, or late). Differences depending on maturation were found on physical fitness, with better results in the advanced maturational groups in the male population (standard mean difference (SMD) = 0.17–2.31; p < 0.001–0.05). Differences depending on maturation were found for kinanthropometric variables in males (SMD = 0.37–2.31; p < 0.001–0.002) and height and body mass in females (SMD = 0.96–1.19; p < 0.001). In conclusion, the early maturation group showed higher values in kinanthropometric variables and better results in physical fitness, highlighting the importance of the maturational process in the talent selection programs. Despite that, more research is needed to clarify the relationship of maturation with the other variables on female populations and the changes in the muscle and bone variables during the maturation processes of both sexes.

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Kang, J. K., J. H. Yang, K. Naruse, C. S. Park, K. S. Min e D. I. Jin. "315THE REDUCTION OF MATURATIONAL COMPETENCE BY STREPTOMYCIN DURING IN VITRO MATURATION OF GOAT FOLLICULAR OOCYTES". Reproduction, Fertility and Development 16, n. 2 (2004): 277. http://dx.doi.org/10.1071/rdv16n1ab315.

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Antibiotics are commonly added to mammalian oocyte maturation media, but their effects on oocytes maturation have not been examined thoroughly. Goat follicular oocytes were used to investigate whether penicillin, streptomycin or gentamycin affect maturational competence of oocytes and subsequent parthenogenetic activation potential in vitro. Cumulus-oocyte complexes collected from a local abattoir were matured for 24h in five treatments, and matured oocytes were cultured for 48h in five treatments after parthenogenetic activation by treatment with ionomycin, followed by immediate exposure to 6-diethlaminopurine; (1) Control: TCM-199 medium with no antibiotics, (2) TCM-199 with 100IU/mL−1 penicillin (P-4687, Sigma, St. Louis, MO, USA), (3) TCM-199 with 50μgmL−1 streptomycin (S-1277, Sigma), (4) TCM-199 with 50μgmL−1 gentamycin (G-1264, Sigma) and (5) TCM-199 with both 100IUmL−1 penicillin and 50μgmL−1 streptomycin. Maturation rates at 24h post-in vitro maturation and parthenogenetic cleavage development at 48h post-activation were evaluated. Data were analyzed by ANOVA and Student’s t-test. Penicillin and gentamicin treatment groups did not affect maturation rates and percentages of cleavage to 2–4 cell stage at 48h post-chemical oocyte activation. However, when streptomycin was present in the maturation medium, the percentages of matured oocytes at 24h post-in vitro maturation of immature goat oocytes were significantly lower than those from the other groups. However, among the five treatments, there was no significant difference in cleavage rates of matured oocytes at 48h post-activation (Table 1). Therefore, streptomycin did interfere with the maturation of immature goat oocytes, but did not affect the subsequent development of matured goat oocytes. The mechanism by which streptomycin affects the maturation of goat follicular oocytes needs to be investigated further. We conclude that streptomycin in oocyte maturation medium can be detrimental during in vitro maturation of goat follicular oocytes. Table 1 Effect of antibiotics on maturational competence of goat follicular oocytes and subsequent parthenogenetic activation potential in vitro

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Reho, John J., Xiaoxu Zheng, James E. Benjamin e Steven A. Fisher. "Neural programming of mesenteric and renal arteries". American Journal of Physiology-Heart and Circulatory Physiology 307, n. 4 (15 agosto 2014): H563—H573. http://dx.doi.org/10.1152/ajpheart.00250.2014.

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There is evidence for developmental origins of vascular dysfunction yet little understanding of maturation of vascular smooth muscle (VSM) of regional circulations. We measured maturational changes in expression of myosin phosphatase (MP) and the broader VSM gene program in relation to mesenteric small resistance artery (SRA) function. We then tested the role of the sympathetic nervous system (SNS) in programming of SRAs and used genetically engineered mice to define the role of MP isoforms in the functional maturation of the mesenteric circulation. Maturation of rat mesenteric SRAs as measured by qPCR and immunoblotting begins after the second postnatal week and is not complete until maturity. It is characterized by induction of markers of VSM differentiation (smMHC, γ-, α-actin), CPI-17, an inhibitory subunit of MP and a key target of α-adrenergic vasoconstriction, α1-adrenergic, purinergic X1, and neuropeptide Y1 receptors of sympathetic signaling. Functional correlates include maturational increases in α-adrenergic-mediated force and calcium sensitization of force production (MP inhibition) measured in first-order mesenteric arteries ex vivo. The MP regulatory subunit Mypt1 E24+/LZ- isoform is specifically upregulated in SRAs during maturation. Conditional deletion of mouse Mypt1 E24 demonstrates that splicing of E24 causes the maturational reduction in sensitivity to cGMP-mediated vasorelaxation (MP activation). Neonatal chemical sympathectomy (6-hydroxydopamine) suppresses maturation of SRAs with minimal effect on a conduit artery. Mechanical denervation of the mature rat renal artery causes a reversion to the immature gene program. We conclude that the SNS captures control of the mesenteric circulation by programming maturation of the SRA smooth muscle.

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Uchikura, Kenzo, Masashi Nagano e Mitsugu Hishinuma. "Prediction of maturational competence of feline oocytes using supravital staining of cumulus cells by propidium iodide". Zygote 20, n. 4 (18 maggio 2011): 333–37. http://dx.doi.org/10.1017/s096719941100027x.

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SummaryWe examined the relationship between integrity of cumulus cells and nuclear maturation rate after in vitro culture to determine a non-invasive prediction of the maturational competence of feline oocytes. Feline cumulus–oocyte complexes (COCs) were collected from either small (400–800 μm) or large (≥800 μm) follicles. Immediately after collection, cumulus cells were evaluated morphologically (thickness of cumulus cell layers) and stained with propidium iodide (PI), which penetrates only non-viable cells. Cumulus cells without PI staining were judged as having good membrane integrity. After evaluation, COCs were cultured for 30 h and their nuclear maturation rate was determined. The nuclear maturation rate of oocytes derived from large follicles (89.8%) was higher (p < 0.05) than that from small follicles (60.8%). There was no difference in the maturation rate of oocytes from follicles with the same size regardless of cumulus morphology. In contrast, oocytes that had cumulus cells with good membrane integrity showed a higher maturation rate (93.8%) than oocytes with poor cumulus integrity (76.9%) in large follicles (p < 0.05). We conclude that evaluation of membrane integrity of cumulus cells by propidium iodide staining can be used to predict the maturational competence of oocytes.

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Armstrong, Neil, Joanne R. Welsman e Brian J. Kirby. "Performance on the Wingate Anaerobic Test and Maturation". Pediatric Exercise Science 9, n. 3 (agosto 1997): 253–61. http://dx.doi.org/10.1123/pes.9.3.253.

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The influence of sexual maturation on the Wingate anaerobic test performance of 100 boys and 100 girls, ages 12.2 ±0.4 years, was examined using Tanner’s indices of pubic hair and, in boys, salivary testosterone as measures of maturation. No sex differences (p > .05) in either peak power (PP) or mean power (MP) were revealed. Significant main effects (p < .01) for maturation were detected for both PP and MP expressed in W, W · kg−1, or with body mass controlled using allometric principles. Testosterone did not increase the variance in PP or MP explained by body mass alone (p > .05). No sex or maturational effects were observed for postexercise blood lactate (p > .05). Testosterone was not (p > .05) correlated with blood lactate. Thus, sexual maturation exerts an influence on PP and MP independent of body mass, but maturational effects on postexercise blood lactate remain to be proven in this age group.

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Più fonti

Tesi sul tema "Maturation"

Papadiamantis, Anastasios. "Maturation and ageing in biominerals with application to enamel maturation". Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7155/.

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Dental enamel consists mainly of calcium-deficient hydroxyapatite (CDHA). The formation and evolution of enamel is a progressive and complex process the final stage of which is post-eruptive maturation (PEM), when mineralisation is completed following tooth eruption and exposure to oral fluids. Although PEM is directly correlated with decrease in caries susceptibility, a complete model to describe the whole process does not exist. Several reports have recently suggested that the previously observed caries decline, which started with the introduction of F- in drinking water and dental products, has stopped and is in some cases in reverse. New research approaches are therefore needed, which will focus on caries prevention and not treatment. This project monitored the in vitro effects of simulated PEM on the physicochemical properties of dental enamel and proposed a model which describes the whole process. For this purpose, primary and permanent bovine enamel was tested, using a suitably designed demineralisation/remineralisation laboratory protocol as well as characterisation techniques. The results were applied to the synthesis of enamel proxies, which could mimic the physicochemical properties of dental enamel; these proxies were evaluated for their potential to be used as enamel substitutes in dental research.

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Brunious, Wendell J. "Maturation of Practices". ScholarWorks@UNO, 2014. http://scholarworks.uno.edu/td/1855.

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The disparate concepts of Pop Art and abstract painting heavily influence the scope of my work. Finding a link between these two concepts has been the focal point of my studio practices. The apex of my process is the focus on commercial imagery as abstract form. The merging of these two concepts presents a complex composition of balance, color and information. This thesis explores the various concepts as well as influences that have propelled the evolution of my work. It chronicles the steps I have taken in my quest to articulate my conceptual ideas. By describing the works and defining their characteristics, this analysis gives further insight to my perception as well as process.

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Wang, Ling. "Mouse oocyte maturation: How similar is it to frog oocyte maturation?" Thesis, University of Ottawa (Canada), 2005. http://hdl.handle.net/10393/27075.

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In this study, I have attempted to address the similarities/differences between amphibian and mouse oocytes by focusing on two aspects of mouse oocyte maturation. In the first project, I investigated the ability of several antagonists of serotonin receptors to initiate follicle-enclosed mouse oocytes to undergo maturation. I demonstrated that ritanserin, but not any others, was capable of inducing oocyte maturation in the intact mouse follicles. Significantly, ritanserin is also capable of inducing frog oocyte maturation, as demonstrated by others in our lab. These results therefore suggested that a similar cAMP-elevating G protein coupled receptor, the target of ritanserin, is responsible for maintaining prophase arrest in both frog and mouse oocytes. In the second project, I have investigated the ability brefeldin A (BFA), a specific inhibitor of a small G protein ARF1, to initiate mouse oocyte maturation, as it has been suggested that BFA is capable of inducing frog oocyte maturation. I demonstrated that BFA indeed was as potent as human chorionic gonadotropin (HCG) to initiate follicle-enclosed oocytes to undergo germinal vesicle breakdown. However, BFA-treated oocytes failed to complete maturation and, instead, were arrested at metaphase I with apparently normal bipolar spindles. We further demonstrated a dominant negative mutant of ARF1 (ARF1-T31N-HA) similarly arrested the maturing oocytes at metaphase I. These studies helped reinforce the idea that oocyte maturation is fundamentally the same in mammals as it is in amphibians. The experimentally observed differences may not be very significant biologically. This concept will be discussed in conjunction with recently published literature. (Abstract shortened by UMI.)

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Tiklová, Katarína. "Airway maturation in Drosophila". Doctoral thesis, Stockholms universitet, Wenner-Grens institut, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-62419.

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Tubes are a fundamental unit of organ design. Most of our major organs like the lung, kidney and vasculature are composed primarily of tubes. To identify fundamental biological principles of tubular organ formation we used the respiratory organ of Drosophila melanogaster, the trachea.This work dissects embryonic trachea maturation. Three precise epithelial transitions occur during airway maturation. A secretion burst deposits proteins into the lumen; then luminal material is cleared and finally liquid is removed. We identified the cellular mechanisms behind these transitions. Sar1 and γCOP are required for protein secretion, matrix assembly and tube expansion. Rab5-dependent endocytic activity internalizes and clears luminal contents. The data show how programmed transitions in cellular activities form functional airways, and may reflect a general mechanism in respiratory organ morphogenesis.We further focused on tube size regulation. We identified Melanotransferrin, a new component of septate junctions that limits tracheal tube elongation. MTf is a lipid- modified, iron-binding protein attached to epithelial cell membranes, similarly to its human homologue. We show that septate junction assembly during epithelial maturation relies on endocytosis and apicolateral recycling of iron-bound MTf. Mouse MTf complements the defects of Drosophila MTf mutants. This provides the first genetic model for the functional dissection of MTf in epithelial morphogenesis. In the last part, we describe two genes, which are selectively involved in tube diameter expansion. Obst-A and Gasp are closely related proteins with characteristic chitin-binding domains. They are strongly expressed in the trachea at the time of lumen expansion. The single and double mutants cause a tube diameter reduction, whereas their overexpression leads to its increase. We propose that Obst-A and Gasp organize luminal matrix assembly and thereby regulate the extent of tube diameter expansion.
At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 4: Manuscript.

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Herbert, Mary. "Maturation of human oocytes". Thesis, University of Newcastle Upon Tyne, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362470.

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Davies, S. "Oocyte maturation in mice". Thesis, University of Essex, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377928.

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Low, Nigel Murray. "Mimicking antibody affinity maturation". Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364567.

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Collins, Angela Joyce. "Maturation-related genes from eucalyptus". Thesis, University of Oxford, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365297.

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Soegiharto, Benny Mulyono. "Skeletal maturation assessment in orthodontics". Thesis, University College London (University of London), 2007. http://discovery.ucl.ac.uk/1445101/.

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Aims: (1) To assess skeletal maturation in orthodontics using hand-wrist and cervical vertebrae methods and (2) To characterise the morphological differences of the craniofacial and cervical vertebrae morphologies at different growth stages in two different populations.;Subjects and Methods for the main study: The study included 2,167 subjects with hand-wrist and lateral cephalometric radiographs. Of these, there were 648 Indonesian males, 303 Caucasian males (age range 10-17 years), 774 Indonesian females and 442 Caucasian females (age range 8-15 years). Each hand-wrist radiograph was observed and classified according to the Skeletal Maturation Index (SMI) (Fishman, 1982). Similarly, cervical vertebrae maturation was assessed using lateral cephalometric radiographs. The outlines of the cervical vertebrae were traced and classified according to the Cervical Vertebrae Maturation (CVM) Index (Baccetti et al., 2002). Craniofacial and cervical vertebrae morphologies were evaluated from the lateral cephalograms. Each radiograph was initially traced and then digitised using a customised computer program.;Results: 1. Repeatability study (Chapter 2) Kappa values showed substantial to good intra-operator repeatability for the Skeletal Maturation Index (SMI) and Cervical Vertebrae Maturation (CVM Index) for both ethnic groups and these two methods were used in the main study. For the cephalometric data, the Bland and Altaian method and the Lin's Concordance Correlations showed acceptable agreement and the methods were considered appropriate for use in the main study. 2. Main study: Chapter 3: Skeletal maturation stages were described using the SMI and CVM Index. On average, the Caucasian children attained each maturational stage at an earlier age than their Indonesian peers although the differences were less obvious in females than in males. Multiple regression analysis showed that, on average at any given age, the Caucasian males were 1 SMI stage ahead of the Indonesians, whilst the Caucasian females were around 0.5 SMI stage ahead of their Indonesian peers. Chapter 4: Ages of attainment of peak pubertal growth for the selected craniofacial parameters were determined. Growth curves and growth velocity curves were constructed for each of these parameters. The results for the craniofacial parameters showed that the Caucasian males attained peak pubertal growth slightly earlier than their Indonesian peers for the majority of parameters. However, in contrast to the SMI and CVM Index results, the Indonesian female, on average, reached peak pubertal growth earlier than the Caucasians for the majority of parameters. In both Indonesians and Caucasians, on average, the females reached peak pubertal growth of the craniofacial parameters earlier than the males. Chapter 5: Receiver Operating Characteristic (ROC) analysis was performed to assess, and compare, the ability of the SMI and CVM Index to discriminate between subjects who had yet to attain peak pubertal growth and those who had reached, or passed it. This analysis was based on the velocity growth curves produced for Chapter 4. Areas Under the ROC Curve analysis (AUC) for the SMI (AUC > 0.9) were greater than those for the CVM Index (AUC > 0.8) and the differences between the two methods were statistically significant (P<0.05 for all parameters investigated). Nevertheless, the curves for both SMI and CVM approached the top left comer of the ROC graphs, indicating that both tests have good discriminatory ability. The differences between the two methods ranged between only 1 and 7%. Chapter 6: Differences in the craniofacial and cervical vertebrae structures at different growth stages in both ethnic and gender groups were investigated.;Conclusions: Differences in the age of attainment of each skeletal maturation stage, as well as the age of attainment of the peak pubertal growth of selected craniofacial parameters, exist between the two ethnic and gender groups. These differences need to be taken into account in orthodontic diagnosis and treatment planning. This study also confirmed the validity of both the SMI and CVM Index to discriminate individuals into those who have yet to attain peak pubertal growth and those who have reached/passed peak pubertal growth. However, as the differences in the discriminatory ability were low, this study questions the benefit of taking additional hand-wrist radiographs when the use of lateral cephalograms can be optimised. There were differences in craniofacial and cervical vertebrae morphologies between the two ethnic and gender groups, although they were usually not statistically significant. A small number of parameters showed statistically significant differences, however, these differences were small and unlikely to be clinically relevant. Therefore this study suggests that orthodontic modalities commonly used in Caucasians, may also be applied in Indonesian subjects and that the use of the CVM Index is justified in Indonesians.

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Haigh, R. M. "Urogastrone and fetal lung maturation". Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377734.

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Più fonti

Libri sul tema "Maturation"

Arenz, Christoph, a cura di. miRNA Maturation. Totowa, NJ: Humana Press, 2014. http://dx.doi.org/10.1007/978-1-62703-703-7.

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Philippe, Labrune, a cura di. Maturation et vulnérabilité. Paris: Flammarion Médecine-Sciences, 2005.

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Ermellina, Fedrizzi, e Riva Daria, a cura di. Maturation and learning. Milano: Masson Italia Periodici, 1986.

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Hannush, Mufid James. Markers of Psychosocial Maturation. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-74315-4.

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Dettlaff, T. A., S. G. Vassetzky e Frank Billett, a cura di. Oocyte Growth and Maturation. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4684-0682-5.

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Ballard, Philip L. Hormones and Lung Maturation. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82483-8.

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A, Ballard Roberta, a cura di. Hormones and lung maturation. Berlin: Springer-Verlag, 1986.

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Antonovna, Detlaf Tatʹi͡a︡na, Vassetzky S. G e Billett F. S, a cura di. Oocyte growth and maturation. New York: Consultants Bureau, 1988.

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Ito, Umeo, T. Kirino, T. Kuroiwa e Igor Klatzo, a cura di. Maturation Phenomenon in Cerebral Ischemia. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-77134-7.

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Kräusslich, Hans-Georg, a cura di. Morphogenesis and Maturation of Retroviruses. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-80145-7.

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Capitoli di libri sul tema "Maturation"

Miller, Gregory H. "Maturation". In Whisky Science, 259–322. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-13732-8_8.

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MacDonald, Pamelyn M. "Maturation". In Encyclopedia of Child Behavior and Development, 927. Boston, MA: Springer US, 2011. http://dx.doi.org/10.1007/978-0-387-79061-9_1730.

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Gooch, Jan W. "Maturation". In Encyclopedic Dictionary of Polymers, 906. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_14185.

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Levesque, Roger J. R. "Maturation". In Encyclopedia of Adolescence, 1–3. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-32132-5_794-1.

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Levesque, Roger J. R. "Maturation". In Encyclopedia of Adolescence, 2237–39. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-33228-4_794.

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Merzbach, Uta C. "Maturation". In Dirichlet, 71–84. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-01073-7_8.

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Miller, Gregory H. "Maturation". In Whisky Science, 377–478. Cham: Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-50687-1_8.

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Robinson, R. K., e R. A. Wilbey. "Cheese maturation". In Cheesemaking Practice, 271–87. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-5819-4_15.

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Guraya, Sardul S. "Ovum Maturation". In Biology of Ovarian Follicles in Mammals, 150–94. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-70154-2_4.

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Delgui, Laura R., e José F. Rodríguez. "Virus Maturation". In Subcellular Biochemistry, 395–415. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-6552-8_13.

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Atti di convegni sul tema "Maturation"

Dupont, Audrey, e Jean-Remi Masse. "PHM functions maturation". In 2016 IEEE International Conference on Prognostics and Health Management (ICPHM). IEEE, 2016. http://dx.doi.org/10.1109/icphm.2016.7542848.

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Wang, Boru. "Research on vitro oocyte maturation technology and factors affecting oocyte maturation". In Third International Conference on Biological Engineering and Medical Science (ICBioMed2023), a cura di Alan Wang. SPIE, 2024. http://dx.doi.org/10.1117/12.3012934.

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Hassan, A. M., S. M. Alawad, A. E. Moh-Ali, M. A. Mahmoud, A. H. El-Husseiny e I. S. Abu-Mahfouz. "Maturating Organic-Rich Source Rocks Using Superheated Gases Injection: Heat Transfer Analysis". In ADIPEC. SPE, 2023. http://dx.doi.org/10.2118/216601-ms.

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Abstract Understanding unconventional formations is very important in order to improve the hydrocarbon production from these reservoirs. Different methods are used to increase the hydrocarbon recovery utilizing chemical injections. This study proposes a method for maturating unconventional shale formations using gases injection approach. The suggested method focuses on generating and improving gas production from immature and early mature organic-rich source rocks. The method comprises injecting superheated gases into the subsurface formation. The injected gases can maturate the organic matter due to the heat transfer between the high-temperature gases and kerogen. In this study, different superheated gases were examined including hydrogen, carbon dioxide, nitrogen, methane, steam, and air. Heat transfer analysis was carried out to investigate the impact of the injected gas on increasing the temperature of shale rock. Parameters such as injection velocity, rock density, and injection time were examined. Also, experimental measurements were carried out to capture the changes in organic and inorganic contents due to artificial maturation. The obtained results showed that the organic content can be reduced by around 8 to 33%, depending on the maturation conditions. The performance of the maturation treatment can be affected significantly by the temperatures of injected gases, treatment time, heating rate, gas type, and shale density. Among all examined gases, hydrogen and methane gases showed the highest maturation performance due to the fastest heat transfer. Also, increasing the kerogen density showed a negative impact on the maturation process by reducing heat transfer efficiency. Overall, injecting superheated hydrogen and methane gases at the maximum injection rate into shale formations of lower density would provide the best maturation performance.

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CASSIDY, F., S. VUKELICH e J. SAMMONS. "Engine life maturation process". In 25th Joint Propulsion Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1989. http://dx.doi.org/10.2514/6.1989-2464.

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JOHNSON, JOHN E. "VIRUS ASSEMBLY AND MATURATION". In Folding and Self-Assembly of Biological Macromolecules Conference. WORLD SCIENTIFIC, 2004. http://dx.doi.org/10.1142/9789812703057_0013.

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Onwumelu, C., S. H. Nordeng e G. P. Muscio. "Controls on Thermal Maturation – Insights from Artificial Maturation of Organic Rich Shales". In 30th International Meeting on Organic Geochemistry (IMOG 2021). European Association of Geoscientists & Engineers, 2021. http://dx.doi.org/10.3997/2214-4609.202134357.

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Rhodes, Russel E., Carey M. McCleskey e John W. Robinson. "Commercial Space with Technology Maturation". In 49th AIAA/ASME/SAE/ASEE Joint Propulsion Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2013. http://dx.doi.org/10.2514/6.2013-3802.

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Popov, A., I. Edelman, T. McCormic e H. Lauferts. "Accelerated Hydrocarbon Maturation: a Workflow". In Progress’19. European Association of Geoscientists & Engineers, 2019. http://dx.doi.org/10.3997/2214-4609.201953045.

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Rombach, Dieter, e Andreas Jedlitschka. "The Maturation of Empirical Studies". In 2015 IEEE/ACM 3rd International Workshop on Conducting Empirical Studies in Industry (CESI). IEEE, 2015. http://dx.doi.org/10.1109/cesi.2015.7.

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Alghamdi, Abdulaziz, Amjed Hassan, Mohamed Mahmoud, Ammar El-Husseiny e Israa S. Abu-Mahfouz. "Characterizing Unconventional Hydrocarbon Resources Through Geochemical Analysis". In International Petroleum Technology Conference. IPTC, 2024. http://dx.doi.org/10.2523/iptc-24404-ms.

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Abstract This study presents the use of geochemical analysis in order to improve the evaluation of unconventional recourses. Several parameters were studied including total organic carbon (TOC), free hydrocarbon amount (S1), potential hydrocarbon (S2), hydrogen index (HI), oxygen index (OI), pyrolyzed carbon (PC), and total sulfur content (Total S). The main objective is to understand the relationship between all these parameters and to examine the impact of thermal maturation on the geochemical variables. Organic-rich shale samples were collected and used in this work. The shale samples were maturated at different temperatures and for various durations. The Rock-Eval analysis was carried out before and after each thermal treatment in order to capture the changes in the geochemical properties. The obtained results showed that thermal maturation can significantly change the geochemical properties, reducing the total organic carbon, increasing the S1, and reducing the HI. A reduction in the total organic carbon was observed, the TOC was reduced from around 20 to 15 and 12 wt.% after maturating the shale samples at 250 for one and two days, respectively. While the S1 was increased by three times on average due to the maturation processes. The HI was reduced from around 800 to less than 350 due to the maturation revealing that the kerogen was converted into vaporized hydrocarbon which leaves the shale and leads to the HI reduction. The vaporization of organic matter led to an increase in the rock porosity by around 4 to 8 p.u. Overall, this study confirms the importance of integrating different geochemical properties in order to improve the evaluation of unconventional resources.

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Rapporti di organizzazioni sul tema "Maturation"

Thornton, Remington. Status of Technical Maturation Effort. Office of Scientific and Technical Information (OSTI), giugno 2024. http://dx.doi.org/10.2172/2377687.

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Poulton, T. P. Fossils: Thermal Maturation Indicators, northwestern Mainland Canada. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1989. http://dx.doi.org/10.4095/127558.

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Ascoli, P., M. P. Avery, M. S. Barss, J. P. Bujak, E H Davies, P. A. Fensome, J K Hacquebard et al. Biostratigraphy and maturation data 6: selected wells. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1991. http://dx.doi.org/10.4095/210618.

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Ascoli, P., M. P. Avery, M. S. Barss, J. P. Bujak, E H Davies, P. A. Fensome, J K Hacquebard et al. Biostratigraphy and maturation data 5: selected wells. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1991. http://dx.doi.org/10.4095/210620.

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Ascoli, P., M. P. Avery, M. S. Barss, J. P. Bujak, E H Davies, P. A. Fensome, J K Hacquebard et al. Biostratigraphy and maturation data 7: selected wells. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1991. http://dx.doi.org/10.4095/210621.

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Ascoli, P., M. P. Avery, M. S. Barss, J. P. Bujak, E H Davies, P. A. Fensome, J K Hacquebard et al. Biostratigraphy and maturation data 8: selected wells. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1991. http://dx.doi.org/10.4095/210622.

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Keller, Elizabeth James Kistin, Drake Warren e Marguerite Evelyn Hess. Comparison of State-Funded Technology Maturation Programs. Office of Scientific and Technical Information (OSTI), dicembre 2016. http://dx.doi.org/10.2172/1336298.

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Williams, G. L., e R. A. Fensome. Biostratigraphy / Maturation Data, I, Labrador sea, selected Wells. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1989. http://dx.doi.org/10.4095/127172.

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Williams, G. L., e R. A. Fensome. Biostratigraphy / Maturation Data, II, Labrador sea, Selected Wells. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1989. http://dx.doi.org/10.4095/127173.

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Williams, G. L., e R. A. Fensome. Biostratigraphy / Maturation Data, III, Labrador sea, Selected Wells. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1989. http://dx.doi.org/10.4095/127174.

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