Search results for "pine"

Intraoperative microvascular Doppler monitoring of blood flow within a spinal dural arteriovenous fistula: a precious surgical tool. Case report.

2001

The authors describe a case of spinal arteriovenous fistula (AVF) treated by a microvauscular Doppler–assisted surgical interruption of the arterialized vein. Microvascular Doppler monitoring represents a valid, widely available, non-invasive tool that enables identification, through flow spectrum analysis, of components of this type of vascular malformation. In this case because the location of the fistula was identified prior to opening the dura only minimally invasive surgery was required. Direct recordings of the arterialized draining vein and the nidus of the fistula demonstrated a pathological spectrum caused by the arterial supply and the disturbed venous outflow in which a high-resi…

Update of the distribution and habitat use of the wildcat, pine marten and weasel in Sicily

2020

The wildcat (Felis silvestris), the pine marten (Martes martes) and the weasel (Mustela nivalis) are key members of the mammalian community in Sicily, actually performing the role of top predators and consequently influencing the trophic chain both in natural and agricultural areas. However, despite their protected status, very little information is available regarding their occurrence and ecology. Here, by verifying published studies, collecting personal observations and analyzing novel field data obtained by camera traps, we update their spatial distribution in Sicily, contributing to a better understanding of their habitat use and suggesting future research to improve our knowledge of th…

Long-Term Effects of Climate Warming on Forest Soil Collembola

2005

Long-term changes in the collembolan community structure were studied in a Scots pine forest in northern Latvia over a period of 11 successive years (1992–2002). Soil Collembola were yearly sampled from three pine forest stands of different age – young (30 to 40 years old), middle-aged (50 to 70 years old) and old (150 to 200 years old). During the study period a statistically significant increase in sums of positive temperatures (>+4°C) was recorded and a gradual decrease in species richness of Collembola was observed in all forest stands. The study showed that sums of positive air temperatures produce statistically significant effects on collembolan populations. Community responses were s…

Xeric grasslands of the inner-alpine dry valleys of Austria - new insights into syntaxonomy, diversity and ecology

2021

We are grateful to the IAVS for financial support for some of the participants. We would like to give special thanks to Dr. Ernst Partl, director of the Naturpark Kaunergrat for authorizing sampling in the protected areas and for helping with the organization of the field workshop.

Climate-tree-growth relationships of Scots pine stands (Pinus sylvestris L.) exposed to soil dryness

1998

Dendroclimatological techniques were used to assess the impact of climatic factors on radial tree growth (total ring-width and latewood-width) of stunted Scots pine trees (Pinus sylvestris L.) exposed to soil dryness and nutrient deficiency on a dolomite substrate. The response of eight scattered populations representing various habitats, yet influenced by the same regional climate was investigated. Total ring-width and latewood-width were dated, standardized and several chronology statistics, which estimate the chronology signal strength and the potential climate signal in the series, were determined. Dendroclimatic analysis comprised evaluation of event/pointer years as well as response f…

‘Back to the Future’—Oak wood-pasture for wildfire prevention in the Mediterranean

2021

In the summer of 2021, enormous wildfires in the Mediterranean eliminated huge areas of mainly coniferous forest, destroyed adjacent settlements and claimed the lives of many people. The fires indicate effects of climate change and expose consequences of rural demographic changes, deficits in regional and touristic development planning and shortcomings in forest policy. This forum article highlights the dimensions of the problem, calls for a paradigm shift and shows solutions. Land abandonment, woody plant encroachment and non-reflective afforestation are leading to increasing amounts of combustible biomass. To prevent disastrous fires in future, fundamental changes in tree species composit…

Economic Freedom and the Pursuit of Happiness

2011

Argentina’s Economic Development and Life Satisfaction Revisited – 1984–2012

2014

At the end of 1983, Argentina returned to democracy. Between 1983 and 2012, Argentina brought better economic and development results as wells as an improvement in the levels of happiness and life satisfaction. Although the macroeconomic cycle was characterized by high volatility, the country GDP per capita was 74 % higher in 2012 compared to 1983, implying an average annual growth rate of 1.9 %, much higher than the average Latin American country. Poverty and income distribution as well as health and education ones notably improved after time intervals of decadence.

New paradigm of ICT productivity – Increasing role of un-captured GDP and growing anger of consumers

2015

Abstract The dramatic advancement of the Internet has led all nations to an information communication technology (ICT) driven development trajectory. This trajectory has resulted in bi-polarization between ICT growing economies and ICT advanced economies. While the former enjoys a virtuous cycle between ICT advancement and productivity increase, the later has fallen into a trap of a vicious cycle between ICT advancement and productivity decrease. This paper identifies that this trap can be attributed to the two-faced nature of ICT in which advancement of ICT contributes to price increases due to functionality development while dramatic advancement of the Internet has resulted in price decre…

Putting Inputs to Work in Elementary Schools: What Can Be Done in the Philippines?

1997

The paper consists in estimating a value-added educational production function of primary education in the Philippines. The information used match household and school-based survey data. The Huber White technique is used so as to take into account the problem of heteroscedasticity when merging individual pupil variables with class/school variables; this procedure helps relate the outcome side of the production (student learning) that concerns the individual level with the input side (school inputs such as teacher qualification, class-size, availability of pedagogical materials, ..) that concerns an aggregate level (class or school). The results show that students taught by a teachers holdin…