1,721,032 research outputs found
Assessing the Alpine ibex and livestock distribution in Gran Paradiso National Park (GPNP)
No full textIn the last few decades a drastic decrease of GPNP ibex population, linked with a reduction of occupied territories, was occurred. This decline is partially related to recent climate changes but causes are still not completely clear. This work aims:
1) to analyse Alpine ibex (1985-2009) and livestock (2000-2009) distribution in GPNP;
2) to assess relation between distribution pattern and ibex population trend in 2000-2009.
The composition and spatial configuration of ibex and livestock occupied areas were described trough 5 landscape ecology metrics and tested using the Spearman’s rank correlation coefficient. The same statistical measure was also used to assess the relationship between distribution patterns and ibex population size. Results showed a reduction of ibex occupied territories from 4587,50 hectares in 1985 to 2331,25 ha in 2009 (r s = -0,818; P0,05). The relation between changes in ibex population trend and distribution patterns was not proven (all P>0,005). These results suggest that probably ibex distribution was influenced by different combined factors (landscape changes, climate change, and anthropic activities) and they show how landscape ecology approach may become a useful tool to understand the degree of fragmentation and connectivity of landscape, defined on species distribution
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Preliminary study on Alpine ibex (Capra ibex ibex, L.) and livestock distribution in Gran Paradiso National Park
Full text linkIn the last decades there was a drastic decrease in Gran Paradiso National Park ibex population linked
with a reduction of stable occupied territories. Causes are still not completely clear but drastic decline is in
partly related to recent climate changes. The objectives of this work are: (1) understand ibex distribution
in GPNP in 1985-2009 period and describe livestock distribution in the same area in 2000-2009; (2) assess
relation between distribution pattern and ibex population trend in 2000-2009. To understand distribution
patterns 5 landscape ecology metrics are been selected to assess the composition and spatial configuration
of occupied areas. Spearman’s rank correlation coefficient was used to test composition and configuration
metric trends and their relation with ibex population size. Results showed a reduction of ibex occupied
territories from 4,587.50 hectares in 1985 to 2,331.25 ha in 2009 (r
=-0,818; P<0,001). Number of patches
increased from 130 to 224 units (r
s
s
=0,784; P<0,001). Livestock distribution didn’t show a particular trend
(r
s
2
S), ammonia (NH
3
), carbon monoxide (CO), and carbon dioxide (CO
4
types of floating covers were tested: light expanded clay aggregate (leca), peat, sunflower oil, sawdust, straw,
and plastic film. The manure was stored at 5, 15, and 25 °C for 37 d. Gaseous emissions were measured from
headspaces of dynamic chambers. The results of our study showed that both the covering and temperature
have a noticeable impact on gas emission from pig liquid manure. The plastic film cover was the most
efficient at all temperatures tested, because it reduced the emissions of all measured gases. In this instance,
average emission reductions were: CH
4
91.5% (P<0.01), NO 92.0% (P<0.05), H
2
≈0 or P>0,05). The relation between changes in ibex population trend and distribution patterns was not
proven (all P>0,005). These results suggest that probably ibex distribution was influenced by different
combined factors (landscape changes, climate change, anthropic activities) and they show how landscape
ecology approach may become an useful tool to understand the degree of fragmentation and connectivity
of landscape defined on species distribution. In conclusion, the understanding of processes behind Alpine
ungulates distribution have to consider the influence of landscape patterns on environmental processes to
improve the conservation efforts at management level
Determinazione di Benzene e Acido S-fenil mercapturico urinari nella valutazione dell’esposizione professionale a Benzene
No full textAnalisi di anfetamina, MDA, MDMA e MDE in tracce mediante cromatografia liquida e spettrometria di massa multistadio
No full textBiotechnologica sulphated chondroitin sulphate at position 4 or 6 on the same polysaccharide chain, and process for the preparation thereof
No full textThe present invention disclosed a process for the production of chondroitin sulphated with an average molecular weigh (Mw) of 10-30 KDa by chemical sulphation starting from an unsulphated backbone, obtained in turan by acidc hydrolisis of capsular polysaccarides K4 made directly from E. coli strai O5:K4:H14, ordirectly produced from a genetically modified strain of E. coli. Sulphatetion of N-acetil-D-galactosamine residue at position 4 or 6 takes place simultaneously in the same plisaccharide chain, simulating the sulphation pattern observed in natural chondroitin sulphate, unlike the sukphation obtained with the synthesis methods described to date
Analisi di amfetamina, MDA, MDMA e MDE in tracce mediante cromatografia liquida e spettrometria di massa multistadio
No full text
Analisi di amfetamina, MDA, MDMA e MDE in tracce mediante cromatografia liquida e spettrometria di massa multistadio
No full text- …
