scholarly journals Scots pine (Pinus sylvestris L.) seasonal growth at different stages of ontogenesis in Taiga zone (Karelia)

2021 ◽  
Vol 25 (2) ◽  
pp. 19-24
Author(s):  
I.T. Kishchenko ◽  
Keyword(s):  
Growth Rate ◽  
Middle Age ◽  
Annual Growth ◽  
Middle Taiga ◽  
Taiga Zone ◽  
Seasonal Growth ◽  
Middle Aged ◽  
Vegetative Organs ◽  
Different Ages ◽  
Southern Karelia

The studies were conducted in 2014–2015 in southern Karelia (middle taiga subzone). The aim of the research was to study the seasonal growth of shoots, needles and trunks in young (22 years old), middle-aged (55 years old) and ripening (86 years old) stands of Pinetum vacciniosum. The study found that the dynamics of the seasonal growth of vegetative organs in trees during ontogenesis varies somewhat. The beginning of the growth of shoots, needles and trunks does not depend on the age of the tree. The formation of wood cells in the lower part of the trunk in relatively young trees begins on days 8–12 earlier. The end of the growth of shoots and needles in trees of different ages is observed at the same time. The formation of trunks in relatively young stands lasts for 18–25 days longer. The growth rate of the trunks decreases with the age of the tree, the needles — increase, and in shoots it reaches its greatest value in middle age. On average, the annual growth of trunks in young, middle-aged and ripening stands is 2,54, 2,11 and 1,06 mm, respectively, needles — 11,3, 15,5 and 18,8 mg, shoots — 35,1, 38,4 and 34,4 cm. Differences in annual growth of shoots and needles are associated exclusively with the change the intensity of their growth, and the trunks, in addition, and with a difference in the duration of their formation. The features of the curves reflecting the dynamics of growth of vegetative organs in stands of different ages generally remain unchanged, the culmination of their growth being observed almost simultaneously.

Yield and seasonal growth flushing of Protea 'Pink Ice' and Leucadendron 'Silvan Red' in South Australia

1996 ◽  
Vol 36 (7) ◽  
pp. 869 ◽  
Author(s):  
GE Barth ◽  
NA Maier ◽  
JS Cecil ◽  
WL Chyvl ◽  
MN Bartetzko
Keyword(s):  
Growth Rate ◽  
Stem Elongation ◽  
South Australia ◽  
Annual Growth ◽  
Stem Length ◽  
Seasonal Growth ◽  
Fertile Soil ◽  
Plant Data ◽  
Low Levels

Data on yield and growth flushing of 2 protea varieties were collected at commercial sites in South Australia over 3 years. Mean (� s.e.) yield of Protea 'Pink Ice' in terms of marketable stems averaged 63 (�) stems/plant on a highly fertile soil to 39 (�1) stemslplant on an infertile site. On the same sites, Leucadendron 'Silvan Red' yielded means (�se.) of 314 (�13) and 219 (�5) marketable stems/plant. Data are presented in marketing classes based on stem length. Monthly increases in stem length and diameter were used to determine seasonal growth flushing patterns in the 2 cultivars. Pink Ice commenced annual growth in August-September, reached peak growth rate in October and fell to low levels in December. Silvan Red commenced growth between October and November, reached peak growth rate in December and continued stem elongation until March when all growth ceased until the following year.

Ageing Saudi Population in the Facebook Era

2018 ◽  
Author(s):  
Asharaf Abdul Salam
Keyword(s):  
Growth Rate ◽  
Saudi Arabia ◽  
Population Ageing ◽  
Annual Growth ◽  
Annual Growth Rate ◽  
Saudi Population ◽  
Aged Population ◽  
Facebook Usage

<p>Data pertaining to 1974, 1992, 2004 and 2010 Censuses in Saudi Arabia was collected. Some reviews and literature on population ageing in Saudi Arabia as well as Facebook usage obtained. Statistics pertaining to Saudi population was utilized.</p> <p>Aged population in 2010 estimated by assuming the annual growth rate of 1974-2004.</p>

scholarly journals Association between triglyceride-glucose index and risk of arterial stiffness: a cohort study

2021 ◽  
Vol 20 (1) ◽  
Author(s):  
Shouling Wu ◽  
Luli Xu ◽  
Mingyang Wu ◽  
Shuohua Chen ◽  
Youjie Wang ◽  
...  
Keyword(s):  
Growth Rate ◽  
Linear Regression ◽  
Arterial Stiffness ◽  
Multivariate Linear Regression ◽  
Annual Growth ◽  
Annual Growth Rate ◽  
Cross Sectional ◽  
Tyg Index ◽  
Longitudinal Association ◽  
The Cross

Abstract Background Triglyceride–glucose (TyG) index, a simple surrogate marker of insulin resistance, has been reported to be associated with arterial stiffness. However, previous studies were limited by the cross-sectional design. The purpose of this study was to explore the longitudinal association between TyG index and progression of arterial stiffness. Methods A total of 6028 participants were derived from the Kailuan study. TyG index was calculated as ln [fasting triglyceride (mg/dL) × fasting glucose (mg/dL)/2]. Arterial stiffness was measured using brachial-ankle pulse wave velocity (baPWV). Arterial stiffness progression was assessed by the annual growth rate of repeatedly measured baPWV. Multivariate linear regression models were used to estimate the cross-sectional association of TyG index with baPWV, and Cox proportional hazard models were used to investigate the longitudinal association between TyG index and the risk of arterial stiffness. Results Multivariate linear regression analyses showed that each one unit increase in the TyG index was associated with a 39 cm/s increment (95%CI, 29–48 cm/s, P < 0.001) in baseline baPWV and a 0.29 percent/year increment (95%CI, 0.17–0.42 percent/year, P < 0.001) in the annual growth rate of baPWV. During 26,839 person-years of follow-up, there were 883 incident cases with arterial stiffness. Participants in the highest quartile of TyG index had a 58% higher risk of arterial stiffness (HR, 1.58; 95%CI, 1.25–2.01, P < 0.001), as compared with those in the lowest quartile of TyG index. Additionally, restricted cubic spline analysis showed a significant dose–response relationship between TyG index and the risk of arterial stiffness (P non-linearity = 0.005). Conclusion Participants with a higher TyG index were more likely to have a higher risk of arterial stiffness. Subjects with a higher TyG index should be aware of the following risk of arterial stiffness progression, so as to establish lifestyle changes at an early stage.

scholarly journals Several frailty parameters highly prevalent in middle age (50–65) are independent predictors of adverse events

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Lauriane Segaux ◽  
Amaury Broussier ◽  
Nadia Oubaya ◽  
Claire Leissing-Desprez ◽  
Marie Laurent ◽  
...  
Keyword(s):  
Adverse Events ◽  
Middle Age ◽  
Executive Dysfunction ◽  
Community Dwelling ◽  
Living Alone ◽  
Middle Aged ◽  
Cross Sectional ◽  
Balance Impairment ◽  
Logistic Regression Models ◽  
Paris Area

AbstractAlthough frailty can arise in middle age, very few studies have investigated frailty before 65 years. Our objectives were to assess the prevalence of frailty parameters in middle-aged individuals and probe the association with future adverse events. We performed cross-sectional and longitudinal analyses of community-dwelling individuals aged 50 to 65 (n = 411, median age: 59.0) having undergone a multidomain geriatric assessment (2010–2015) in an outpatient clinic in the greater Paris area of France (SUCCEED cohort). The primary outcome was a composite measure of adverse events (non-accidental falls, fractures, unplanned hospitalizations, death), recorded in 2016/2017. Multivariable logistic regression models were built to identify independent predictors. Six frailty parameters were highly prevalent (> 20%): low activity (40.1%), exhaustion (31.3%), living alone (28.5%), balance impairment (26.8%), weakness (26.7%), and executive dysfunction (23.2%). Female sex (odds ratio: 2.67 [95% confidence interval: 1.17–6.11]), living alone (2.39 [1.32–4.33]), balance impairment (2.09 [1.16–3.78]), executive dysfunction (2.61, [1.18–5.77]), and exhaustion (2.98 [1.65–5.39]) were independent predictors of adverse events. Many frailty parameters are already altered in middle-aged individuals and are predictive of adverse health events. Our findings highlight a possible need for frailty screening and preventive programs targeting middle-aged individuals.

scholarly journals StalGrowth—A Program to Estimate Speleothem Growth Rates and Seasonal Growth Variations

Geosciences ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 187
Author(s):  
Rolf Vieten ◽  
Francisco Hernandez
Keyword(s):  
Growth Rate ◽  
Growth Rates ◽  
Environmental Parameters ◽  
Ion Concentration ◽  
Radiometric Dating ◽  
Seasonal Growth ◽  
Climate Signal ◽  
Show Evidence ◽  
Cave Monitoring ◽  
Calcium Ion Concentration

Speleothems are one of the few archives which allow us to reconstruct the terrestrial paleoclimate and help us to understand the important climate dynamics in inhabited regions of our planet. Their time of growth can be precisely dated by radiometric techniques, but unfortunately seasonal radiometric dating resolution is so far not feasible. Numerous cave environmental monitoring studies show evidence for significant seasonal variations in parameters influencing carbonate deposition (calcium-ion concentration, cave air pCO2, drip rate and temperature). Variations in speleothem deposition rates need to be known in order to correctly decipher the climate signal stored in the speleothem archive. StalGrowth is the first software to quantify growth rates based on cave monitoring results, detect growth seasonality and estimate the seasonal growth bias. It quickly plots the predicted speleothem growth rate together with the influencing cave environmental parameters to identify which parameter(s) cause changes in speleothem growth rate, and it can also identify periods of no growth. This new program has been applied to multiannual cave monitoring studies in Austria, Gibraltar, Puerto Rico and Texas, and it has identified two cases of seasonal varying speleothem growth.

scholarly journals The Multiscale Monitoring of Peatland Ecosystem Carbon Cycling in the Middle Taiga Zone of Western Siberia: The Mukhrino Bog Case Study

Land ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 824
Author(s):  
Egor Dyukarev ◽  
Evgeny Zarov ◽  
Pavel Alekseychik ◽  
Jelmer Nijp ◽  
Nina Filippova ◽  
...  
Keyword(s):  
Carbon Cycling ◽  
Western Siberia ◽  
Carbon Accumulation ◽  
Middle Taiga ◽  
Taiga Zone ◽  
Field Station ◽  
Moss Species ◽  
Chamber Method ◽  
The Impact

The peatlands of the West Siberian Lowlands, comprising the largest pristine peatland area of the world, have not previously been covered by continuous measurement and monitoring programs. The response of peatlands to climate change occurs over several decades. This paper summarizes the results of peatland carbon balance studies collected over ten years at the Mukhrino field station (Mukhrino FS, MFS) operating in the Middle Taiga Zone of Western Siberia. A multiscale approach was applied for the investigations of peatland carbon cycling. Carbon dioxide fluxes at the local scale studied using the chamber method showed net accumulation with rates from 110, to 57.8 gC m−2 at the Sphagnum hollow site. Net CO2 fluxes at the pine-dwarf shrubs-Sphagnum ridge varied from negative (−32.1 gC m−2 in 2019) to positive (13.4 gC m−2 in 2017). The cumulative May-August net ecosystem exchange (NEE) from eddy-covariance (EC) measurements at the ecosystem scale was −202 gC m−2 in 2015, due to the impact of photosynthesis of pine trees which was not registered by the chamber method. The net annual accumulation of carbon in the live part of mosses was estimated at 24–190 gC m−2 depending on the Sphagnum moss species. Long-term carbon accumulation rates obtained by radiocarbon analysis ranged from 28.5 to 57.2 gC m−2 yr−1, with local extremes of up to 176.2 gC m−2 yr−1. The obtained estimates of various carbon fluxes using EC and chamber methods, the accounting for Sphagnum growth and decomposition, and long-term peat accumulation provided information about the functioning of the peatland ecosystems at different spatial and temporal scales. Multiscale carbon flux monitoring reveals useful new information for forecasting the response of northern peatland carbon cycles to climatic changes.

Abstract TP80: Incidence And Risk Factors For The Growth And Rupture Of Unruptured Cerebral Aneurysms. Results Of Annual Radiologic Follow Up Study.

Stroke ◽  
2013 ◽  
Vol 44 (suppl_1) ◽  
Author(s):  
Katsumi Matsumoto ◽  
Kouichirou Tsuruzono ◽  
Manabu Sasaki ◽  
Noriyasu Yoshimura ◽  
Toshiki Yoshimine ◽  
...  
Keyword(s):  
Growth Rate ◽  
Cerebral Aneurysms ◽  
Aneurysm Rupture ◽  
Annual Growth ◽  
Annual Growth Rate ◽  
Rupture Rate ◽  
Follow Up Study ◽  
Factors Influencing ◽  
Unruptured Cerebral Aneurysms

Background: The recent trend of the treatment of unruptured cerebral aneurysms(UIAs) is going to be conservative. Their natural history of rupture and growth is still unkown. We present the results of annual radiological follow-up study in UIAs. Method: In recent 12 years, we have found 121patients with 148 unruptured cerebral aneurysms were followed annually using 3D-CTA or MRA. Mean follow-up period was 5.5 year. Several factors influencing rupture or growth were statistically examined. Results: Among 121 patients, 9 ruptured and 11 showed growth of UIAs. Annual rupture rate was 1.3% per year and annual growth rate was 1.6% per year. Aneurysm size was the sole factor influencing rupture(P<0.001), whereas female sex and multiplicity were major factors influencing aneurysm growth(P<0.05). Under size 3mm, annual growth rate was 3.0% whereas annual rupture rate was 0.7%. In 4-6mm, growth rate was 1.6% and rupture rate was 1.6%. In 7-9mm, growth rate was 0 and rupture rate was 5.8%. In over 10mm, growth rate was 2.9% and rupture rate was 11.6%. Within 1 year, rupture occurred in 4 cases, and growth was found in 1 case. Conclusions: By annual radiological examination, growth of UIAs was noted more frequently than aneurysm rupture. Especially UIAs under 3mm, growth was 4 times higher than rupture, radiological follow up is effective for aneurysm rupture. Within 1 year, initially found UIAs should be carefully followed in a short interval.

scholarly journals Influence of a physical education teacher’s perceived age on high school pupils’ perceptions of effectiveness and learning

2018 ◽  
Vol 26 (1) ◽  
pp. 22-35
Author(s):  
Colin G Pennington ◽  
Matthew D Curtner-Smith ◽  
Stefanie A Wind
Keyword(s):  
High School ◽  
Physical Education ◽  
Statistical Tests ◽  
Middle Aged ◽  
Different Ages ◽  
Twelfth Grade ◽  
Lesson Content ◽  
Perceived Age ◽  
Apparent Age

Few studies have focused on the issues older physical education (PE) teachers encounter which may limit their effectiveness. The purpose of this study was to examine the influence of a PE teacher’s apparent age on high school pupils’ learning and perceptions of the teacher. Participants were 114 ninth, tenth, eleventh, and twelfth grade pupils. They were randomly assigned to watch one of two virtually identical filmed swimming lessons taught by the same teacher. In the young-appearance lesson, the teacher taught as his normal and relatively youthful self. In the middle-aged lesson (MAL), his appearance had been aged by a theatrical makeup artist. Following the viewing of their assigned lesson, pupils completed an examination over lesson content and a questionnaire asking them about their perceptions of the teacher. Inferential statistical tests indicated that the pupils who watched the MAL perceived the teacher more favorably. Performance on the content examination was similar for pupils who watched either film. These findings provided support for a psychological/developmental explanation of how and why pupils respond to and learn from PE teachers of different ages.

Sign in / Sign up

Export Citation Format

Share Document