Adaptive Variation in Swimbladder Length and Volume in Dace, Genus Rhinichthys

1972 ◽  
Vol 29 (2) ◽  
pp. 119-127 ◽  
Author(s):  
John H. Gee
Keyword(s):  
Environmental Control ◽  
Age Groups ◽  
Fork Length ◽  
Growth Patterns ◽  
The Other ◽  
Adaptive Variation ◽  
Relative Growth ◽  
Additional Hypothesis ◽  
Ecological Information ◽  
Negative Buoyancy

Relative growth in length and volume of swimbladder is described in four species of dace, genus Rhinichthys. Swimbladder volume varied widely in R. atratulus, R. cataractae, and R. osculus as they adjusted buoyancy by altering swimbladder volume, but variability was less in R. falcatus whose range was overlapped by the other three species. A variety of relative growth patterns in swimbladder length was found due mainly to the presence or absence of an inflection which, when present, varied at fork length of occurrence. Where ecological information was known, the length at occurrence of inflection corresponded to a change in environment occupied, from still to current. In the laboratory, R. atratulus and R. cataractae adjusted swimbladder volume to compensate for different water velocities. All age-groups of the former attained a greater buoyancy than the latter, while R. cataractae reached a lower negative buoyancy. Young R. cataractae made greater adjustments of swimbladder volume than older fish; the reverse occurred with R. atratulus. These adjustments resulted in a significant change in swimbladder length independent of age, except for R. cataractae from Lake Winnipeg which had very short swimbladders. The hypothesis that occurrence of the inflection in swimbladder length was caused by the shift from a still to current environment, resulting in a decrease in swimbladder volume and length was accepted for R. atratulus, but rejected for R. cataractae. An additional hypothesis based on environmental control is proposed.

scholarly journals Age, growth, maturity, longevity and natural mortality of the shortfin mako shark (Isurus oxyrinchus) in New Zealand waters

2006 ◽  
Vol 57 (2) ◽  
pp. 143 ◽  
Author(s):  
S. D. H. Bishop ◽  
M. P. Francis ◽  
C. Duffy ◽  
J. C. Montgomery
Keyword(s):  
Fork Length ◽  
Growth Curves ◽  
Growth Patterns ◽  
Birth Date ◽  
First Year ◽  
Natural Mortality ◽  
Relative Growth ◽  
Mako Shark ◽  
Shortfin Mako ◽  
Males And Females

Shortfin mako sharks were aged by counting growth bands in sectioned vertebrae (n = 256), and assuming annual band-pair deposition. No systematic ageing bias was present and count precision was high. 0+ juveniles were identified from length–frequency plots and assigned ages based on a theoretical birth date of 1 October and their date of capture. A Schnute generalised growth model fitted to the combined vertebral and 0+ data described the growth patterns best. Shortfin makos grow very rapidly initially, increasing by ~39 cm fork length in their first year. Thereafter, males and females grow at similar but slower rates until about age 7 years, after which the relative growth of males declines. Longevity estimates were 29 and 28 years for males and females respectively. Natural mortality (M) is probably in the range of 0.10–0.15. Median ages at maturity were 7–9 years for males and 19–21 years for females. Comparisons of growth curves reported here and elsewhere suggest no regional differences in growth rates. The shortfin mako is a late-maturing species with moderate longevity and low natural mortality. With these life history characteristics and an unknown stock size and structure worldwide, management should be of a precautionary nature.

Belief and quantity: three-year olds' adaptation to listener's knowledge

1986 ◽  
Vol 13 (2) ◽  
pp. 305-315 ◽  
Author(s):  
Josef Perner ◽  
Susan R. Leekam
Keyword(s):  
Age Groups ◽  
The Other ◽  
Insufficient Information ◽  
The Subject

ABSTRACTTwo groups of 3-year-old children (3:0–3;6 and 3;6–4;0) observed two actions of a toy. In one condition an older partner was absent while the subject watched both of the toy actions (fully ignorant partner), whereas in the other condition the partner witnessed one of the two actions together with the subject (partially ignorant partner). When asked about the toy's actions by their partially ignorant partner both age groups adjusted their answers to their partner's ignorance and mentioned only that action which was new to their partner. However, in their answers to their fully ignorant partner the younger children tended to provide insufficient information by mentioning only one instead of both actions.

scholarly journals The ameliorative effect of selenium on Azolla caroliniana grown under UV-B stress

2015 ◽  
Vol 95 (1) ◽  
pp. 20-26 ◽  
Author(s):  
E.M. Mostafa ◽  
A.M.A. Hassan
Keyword(s):  
Growth Rate ◽  
Protein Content ◽  
Doubling Time ◽  
The Other ◽  
Total Glutathione ◽  
Nutrient Media ◽  
Relative Growth ◽  
Other Hand ◽  
Ameliorative Effect ◽  
Glutathione Redox

Exposure ofAzollaplants to UV-B radiation for 6 h resulted in a decrease in biomass and relative growth rate (RGR), which coincided with an increase in doubling time (DT) as compared with the control. Also, the protein content decreased. On the other hand, hydrogen peroxyde (H2O2) and malondialdehyde (MDA) accumulated significantly in UV-treatedAzollaplants. Conversely, the addition of selenium (Se) at 1 ppm resulted in a significant increase in biomass and protein content of untreated and UV-treatedAzollaplants, and a significant reduction in both H2O2and MDA. Moreover, the addition of Se to UV-treated and untreatedAzollaplants resulted in a significant increase in total ascorbate and total glutathione (GSH) contents compared with the control and UV-stressedAzollaplants. Also, glutathione redox potential (GSH/TG) increased significantly in UV-treatedAzollaplants in the presence of Se. There also was a significant increase (38%) in ascorbate peroxidase (APX) activity in UV-treated plants compared with the control. APX activity in the presence of Se did not change significantly compared with the control. Glutathione reductase (GR) activity increased significantly in UV-treatedAzolla, while glutathione peroxidase (GSH-PX) activity did not. On the other hand, both GSH-PX and GR activity in untreated and UV-treatedAzollaplants were significantly enhanced by the application of Se to the nutrient media at a concentration of 1 ppm. Therefore, we can conclude that Se protectsAzollaplants from UV-B stress.

An evolutionary and developmental approach toward understanding of growth variations of two closely related dwarfism of Galium verum

Biologia ◽  
2014 ◽  
Vol 69 (12) ◽  
Author(s):  
Keum Jeong ◽  
Jae-Hong Pak ◽  
Jeong Kim
Keyword(s):  
Cell Proliferation ◽  
Genetic Factors ◽  
Expression Patterns ◽  
Mrna Differential Display ◽  
Growth Patterns ◽  
The Other ◽  
Differential Growth ◽  
Developmental Approach ◽  
Differential Display Method ◽  
Low Activity

AbstractGalium L. is one of the largest and most widespread genus of Rubiaceae, consisting of more than 650 species worldwide. Galium verum var. asiaticum (G. verum a.) is a perennial herbaceous and widely distributed in in Korea peninsula. On the other hand, Galium verum var. asiaticum for. pusillum (G. verum a.p.) is endemic to Korea, inhabiting only on high land of Mt. Halla of Jeju. G. verum a.p. appears to be a dwarfism of G. verum a. We wondered what physiological, environmental, or genetic factors rendered those two taxa morphologically differentiated. We found that G. verum a.p. shows a low activity of the cell proliferation and was not associated with responsiveness contents of auxin and gibberellins. In order to search for genetic factors involved, we carried out an mRNA differential display method using the ACPs, and isolated several different expression genes between the two taxa. We chose one of those genes, which encoded RADIALIS-like proteins: GvaRADL1 from G. verum a. and GvapRADL1 from G. verum a.p. We discuss the relevancy of the genetic variations in regard to the differential expression patterns of those genes and the differential growth patterns of the two variants.

scholarly journals AB0328 CLINICAL AND SEROLOGICAL DIFFERENCES BETWEEN PRIMARY SJOGREN’S SYNDROME PHENOTYPES

2021 ◽  
Vol 80 (Suppl 1) ◽  
pp. 1189.1-1189
Author(s):  
X. E. Larco Rojas ◽  
E. Diez Alvarez ◽  
C. Moriano ◽  
A. López Robles ◽  
T. Pérez Sandoval
Keyword(s):  
Sjögren’S Syndrome ◽  
Sjögren's Syndrome ◽  
Age Groups ◽  
Sjogren’S Syndrome ◽  
Sjogren's Syndrome ◽  
Primary Sjögren’S Syndrome ◽  
The Other ◽  
Neurological Involvement ◽  
Primary Sjogren’S Syndrome ◽  
Sjögren‘S Syndrome

Background:Primary Sjogren’s Syndrome (PSS) is an autoimmune and lymphoproliferative disease with a heterogeneous presentation. It has been postulated that there may be different phenotypes, in some cases presenting a more aggressive disease with systemic manifestations and a higher risk of developing complications. This phenotype has been associated with a higher autoimmune load and an earlier age of presentation. Furthermore, the presence of anti La + has been related to an increased risk of developing Lymphoma.Objectives:To describe the phenotypic characteristics of seronegative PSS in a sample of patients from our practice. To compare the clinical and laboratory characteristics between patients with Ro + / La + and Ro + / La- antibodies. To Analyze if there are differences in patients diagnosed at an early age, compared to a later age.Methods:Clinical and serological characteristics of patients with the diagnosis of PSS were collected from the Rheumatology database of León`s Hospital between 2014-2020. All patients who met the ACR / EULAR 2016 criteria were classified as seronegative Sjogren.In the group of patients with positive autoimmunity, anti-Ro + / La + were compared with the anti-Ro + / La- patients and by age, stratifying them into the following groups: 0-49; 50-69 and> 70 years. The clinical variables analyzed were: glandular inflammation, Raynaud’s phenomenon (RP), pulmonary and neurological involvement, presence of Lymphoma and other tumours. The serological variables were: positivity of ANA, Rheumatoid Factor (RF), hypocomplementemia, hypergammaglobulinemia and B2 microglobulin.Results:72 patients were analysed, 9 were excluded because didn’t meet the criteria. Of the remaining: 90,4% were women, with a mean age of 58,7+/-15,8 years, 12,6% (8) were seronegative. In the seronegative group 25% presented lung involvement (Lymphoid Interstitial Pneumonia), 50% presented with glandular inflammation and only one patient had RP. As complications 1 patient presented Lymphoma and 1 Breast Carcinoma.58,7% (37) Ro + / La + and 28,5% (18) Ro + / La- patients were identified, no statistically significant differences were found between the two groups when comparing: glandular inflammation (8/37 vs 2/18, p = >0.05) RP (9/37 vs 4/18, p = >0.05), pulmonary involvement (5/37 vs. 6/18, p = >0.05), neurological involvement (2/37 vs. 1/18, p = >0.05), presence of Lymphoma (2/37 vs. 0 / 18, p = >0,05), other tumours (2/37 vs 3/18, p = >0.05), ANA positivity (36/37 vs 16/18, p =>0,05), Hypocomplementemia (4/37 vs 3/18, p =>0.05) and Hypergammaglobulinemia (20/37 vs 10/18, p =>0.05). But a higher frequency of positive RF linked to anti La positivity (29/37 vs 6 / 18p = 0.002) was found.When comparing by age groups, the association between RF + and La + remained in the group of 50-69 years (15/18 vs 3/18, p = 0.002) while in the other age groups there were no statistically significant differences. We also observed an increasing trend of the levels of B2microglobulin in La+ patients and later age (p=0,04)Conclusion:The presence of anti La + seems to be associated with other components of autoimmunity such as RF in patients with PSS, although this study did not show a relation with a higher frequency of complications or systemic disease. Also, the presence of La+ at older ages was associated with higher levels of B2 microglobulin. We didn’t find differences with the other described markers of B cell reactivation. Findings differ from those found in the literature, which may be largely due to sample size.References:[1]Quartuccio L., Baldini C., Bartoloni E., et al. Anti-SSA/SSB-negative Sjogren’s syndrome shows a lower prevalence of lymphoproliferative manifestations, and a lower risk of lymphoma evolution. Autoimmunity Reviews 14 (2015) 1019–1022.[2]Quartuccio L, Isola M, Baldini C, Priori R, Bartoloni Bocci E, Carubbi F, et al. Biomarkers of lymphoma in Sjögren’s syndrome and evaluation of the lymphoma risk in prelymphomatous conditions: results of a multicenter study. J Autoimmun 2014; 51:75–80.Disclosure of Interests:None declared

Prevalence and Causal Factors of Playing-Related Musculoskeletal Disorders of the Upper Extremity and Trunk among Japanese Pianists and Piano Students

2006 ◽  
Vol 21 (3) ◽  
pp. 112-117
Author(s):  
Shinichi Furuya ◽  
Hidehiro Nakahara ◽  
Tomoko Aoki ◽  
Hiroshi Kinoshita
Keyword(s):  
Musculoskeletal Disorders ◽  
Age Groups ◽  
Significant Risk ◽  
Significant Risk Factor ◽  
Daily Practice ◽  
The Other ◽  
Causal Factors ◽  
Western Countries ◽  
Other Hand ◽  
The Difference

The purpose of this study was to investigate the prevalence of playing-related musculoskeletal disorders (PRMDs) among Japanese female classical pianists of different age groups. The causal factors for PRMDs also were examined. A group of 203 senior pianists, including piano teachers and students with piano majors at high schools and colleges, were surveyed using questionnaires. Results showed that 77% of these pianists suffered from PRMDs in at least one of their body portions. This value was larger than those reported in Western countries. Forty-four percent of these were serious enough to warrant medical treatment, which was a lower rate than reported in Western countries. The difference in these numbers may reflect the current state of understanding of PRMDs among Japanese pianists and their educators. The prevalence of PRMDs was found to be age-dependent. In the student groups, the finger/hand had the highest rate of PRMDs, followed by the forearm and shoulder. The senior group, on the other hand, had the highest PRMD incidence at the neck/trunk, followed by the forearm and hand/finger. Care may need to be exercised for these differences. The results also indicated that prolonged daily practice (>4 hours), playing chords forcefully, eagerness about practice, and nervous traits were found to contribute to the development of PRMDs in these pianists. Hand size was, on the other hand, not a significant risk factor of PRMDs.

Maturation of the anterior petrous apex: surgical relevance for performance of the middle fossa transpetrosal approach in pediatric patients

2021 ◽  
pp. 1-7
Author(s):  
Robert C. Rennert ◽  
Michael G. Brandel ◽  
Jeffrey A. Steinberg ◽  
David D. Gonda ◽  
Rick A. Friedman ◽  
...  
Keyword(s):  
Pediatric Patients ◽  
Internal Carotid ◽  
Age Groups ◽  
Internal Auditory Canal ◽  
Petrous Bone ◽  
Growth Patterns ◽  
Ct Scans ◽  
Petrous Apex ◽  
Middle Fossa ◽  
Region Growth

OBJECTIVE The middle fossa transpetrosal approach to the petroclival and posterior cavernous sinus regions includes removal of the anterior petrous apex (APA), an area well studied in adults but not in children. To this end, the authors performed a morphometric analysis of the APA region during pediatric maturation. METHODS Measurements of the distance from the clivus to the internal auditory canal (IAC; C-IAC), the distance of the petrous segment of the internal carotid artery (petrous carotid; PC) to the mesial petrous bone (MPB; PC-MPB), the distance of the PC to the mesial petrous apex (MPA; PC-MPA), and the IAC depth from the middle fossa floor (IAC-D) were made on thin-cut CT scans from 60 patients (distributed across ages 0–3, 4–7, 8–11, 12–15, 16–18, and > 18 years). The APA volume was calculated as a cylinder using C-IAC (length) and PC-MPB (diameter). APA pneumatization was noted. Data were analyzed by laterality, sex, and age. RESULTS APA parameters did not differ by laterality or sex. APA pneumatization was seen on 20 of 60 scans (33.3%) in patients ≥ 4 years. The majority of the APA region growth occurred by ages 8–11 years, with PC-MPA and PC-MPB increasing 15.9% (from 9.4 to 10.9 mm, p = 0.08) and 23.5% (from 8.9 to 11.0 mm, p < 0.01) between ages 0–3 and 8–11 years, and C-IAC increasing 20.7% (from 13.0 to 15.7 mm, p < 0.01) between ages 0–3 and 4–7 years. APA volume increased 79.6% from ages 0–3 to 8–11 years (from 834.3 to 1499.2 mm3, p < 0.01). None of these parameters displayed further significant growth. Finally, IAC-D increased 51.1% (from 4.3 to 6.5 mm, p < 0.01) between ages 0–3 and adult, without significant differences between successive age groups. CONCLUSIONS APA development is largely complete by the ages of 8–11 years. Knowledge of APA growth patterns may aid approach selection and APA removal in pediatric patients.

scholarly journals Request Strategies in the American TV Series Full House

Lexicon ◽  
2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Yemima Febriani ◽  
Sharifah Hanidar
Keyword(s):  
Social Distance ◽  
Family Members ◽  
Age Groups ◽  
The Other ◽  
Relative Power ◽  
Adult Age ◽  
Other Hand ◽  
Younger Age ◽  
The Social ◽  
Request Strategies

This research aims to analyze the request strategies used in an American TV Series entitled Full House season 7 episodes 1-12. The main characters are family members from three different age groups (adult, teenager, and children). This research attempts to see if there is any difference on the choice of request strategies used by the three age groups. Blum-Kulka and Olshtain’s (1984) theory on request directness level is used to classify the requests. Relative power and social distance are also studied to see how they influence the characters in making their requests. The results show that mood derivable is the most frequent strategy used by all age groups. Specifically, direct request is highly used by the adult age groups. On the other hand, indirect request is mostly used by the younger age groups. The results also show that all age groups tend to use direct strategy when the social distance is negative. However, when the social distance is positive, the choice of strategy depends on the authority of the speaker.

Playing Position: Anthropometric and Fitness Demands in Youth Soccer

2014 ◽  
Vol 23 (3-4) ◽  
pp. 151-168
Author(s):  
Aristotelis Gioldasis ◽  
Evangelos Bekris ◽  
Ioannis Gissis
Keyword(s):  
Vertical Jump ◽  
Age Groups ◽  
The Other ◽  
Soccer Players ◽  
Early Age ◽  
Short Term ◽  
Running Speed ◽  
Youth Soccer ◽  
Individualized Training ◽  
Almost All

Abstract The aim of this study was to examine the anthropometric and fitness characteristics of soccer players with different positional role. Although, players’ skills are not equally distributed in each position, at elite soccer they have to perform each skill at a sufficient level. However, coaches expertise those from an early age in specific positions without giving them an holistic individualized training. In the study participated 312 Greek players aged 6 to 17 (M= 11.89; SD= 2.33) of 5 age groups (group U7-U8; group U9-U10; group U11-U12; group U13-U14; group U15-U16; group U17). Anthropometric (height, weight, body mass index and body fat) and fitness characteristics (flexibility, vertical jump, running speed, agility and VO2max) of participants were measured. The study showed that goalkeepers and central defenders tend to perform worse than players of the other positional groups in most of their fitness characteristics for almost all the age groups. Furthermore, many tendencies were observed in anthropometric and fitness characteristics between players with different positional roles. This study provides suggestions to coaches regarding their practice of positioning players according to their anthropometric and fitness characteristics for a short term success.

Youth-ing Politics

2021 ◽  
pp. 209-232
Author(s):  
Juliana Uhuru Bidadanure
Keyword(s):  
Young Adults ◽  
Political Power ◽  
Age Groups ◽  
The Other ◽  
Good Basis

This chapter focuses on disparities in political power between age groups. In particular, it looks at the critical underrepresentation of young adults in legislative bodies and makes the case that the introduction of youth quotas should be considered as a remedy. The defense has two parts: the first discusses the likely impact of youth quotas on the substantive representation of young adults’ interests; the other makes the case that youth quotas have symbolic value and could contribute to the affirmation of the young’s status as political equals. The chapter argues that these substantive and symbolic arguments jointly provide a good basis for a politics of youth presence in parliaments. The chapter concludes by drawing attention to the distinction between age and cohort quotas.

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