196,032 research outputs found
Se l'aria ci avvelena. Da vent'anni in Lombardia
No full textOgni anno centinaia di sostanze chimiche nuove prodotte dall’uomo sfuggono nell’ambiente, oltre a molte esalate da fonti naturali, e possono causare danni alla salute umana e agli ecosistemi nelle regioni più avanzate, come la Lombardia.
Qui respiriamo, tra l’altro, monossido di carbonio (CO), biossido di zolfo (SO2), ossidi di azoto (NOx), composti organici volatili (VOC), ozono (O3), metalli pesanti, particolato atmosferico (PM 2,5 e PM 10): cioè gas che hanno differenti reattività e capacità di diffondere su distanze lunghe o corte e inquinare estesi territori.
L’aria della Lombardia, come di tutta la pianura padana, negli ultimi vent’anni è stata molto inquinata, ed ha indotto effetti sia acuti sia cronici sulla salute: da irritazioni respiratorie e gravi malattie cardiache e polmonari, a infezioni acute nei bambini e bronchiti croniche negli adulti, a leucemie e tumori, con mortalità prematura e ridotta speranza di vita.
I dati della più accurata e recente ricerca scientifica, italiana e internazionale, mettono in guardia sulle principali conseguenze del respirare polveri sottili e smog.
Il libro ne presenta in breve i meccanismi d’azione sulla popolazione, come pure su animali e piante in diverse zone lombarde
Polymer-based electrochromic devices
No full textElectrochromic phenomena related to p-doping-undoping process of thiophene-based polymers are briefly described. Electrochromic performance data of poly(2,2'-bithiophene) and poly(3-methylthiophene) polymers, electrosynthesized from 2,2'-bithiophene and 3-methylthiophene commercial products in optimized conditions, to evaluate the possibility of their use in electrochromic devices are surveyed, and the test results of a poly(3-methylthiophene)-based electrochromic device operating in transmissive mode with counter electrode optically passive are reported. Finally, electrochromic performance data of 3-methylthiophene polymers with "tailor-made" conjugation length through electrochemical polymerization of 3-methylthiophene dimers are reported and discussed. © 1992
Fattori influenzanti la presenza e la dinamica di popolazione della Coturnice Alectoris graeca saxatilis in Trentino
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Population trend and distribution of mountain (Lepus timidus) and brown hares (Lepus europaeus) in Central Alps (N-Italy, 1980–2020)
No full textMountainous regions are very vulnerable to climate changes, as they experience higher temperature increases than the surrounding environments. A general movement of species toward higher altitudes, in search of suitable sites, is being observed. In the case of the Italian Alps, an expansion of the brown hare (Lepus europaeus) is possible within the zones occupied by the mountain hare (Lepus timidus), which frequents higher altitudes. The risk is an increase in the hybridization and a contraction of the mountain hare’s range. In this study, we analyzed the hunting bags (weighted by the number of active hunters each year) of brown and mountain hares from the period of 1980–2020, in the province of Sondrio (Central Alps) in northern Lombardy (N-Italy), with the aim of (i) highlighting any population trends in relation to climate change,
(ii) identifying altitudinal changes in the distribution of the two species over the years, (iii) identifying the environmental variables that influence the distribution of the two species, and (iv) creating suitability maps in the study area. To study population trends, the hunting bag data were corrected by dividing the number of hare shot by the number of active hunters in that year. For both species, no population trends were found between 1980 and 2020. Weather variables do not seem to have influenced population trends. No significant trends in the altitudinal distribution of the two species were observed over the period investigated. The results indicate that the two species select different altitudes, with the exception of the belt between 1600 and 1800 m a.s.l. Both species select meadows
Short chain copper(II) n-alkanoate liquid crystals
No full textFour short chain members of the copper(II) n-alkanoate series Cu(Cn)(2), from propanoate to hexanoate, have been synthesized, purified and characterized by means of optical microscopy, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), FTIR and Raman spectroscopy. The TGA study shows that decomposition starts on heating above 420 - 470K ( depending on the sample) in a nitrogen atmosphere. In addition, thermal decomposition was investigated by DSC using special high pressure pans and endo- and excthermic processes were found which have not been reported previously. All but one of the compounds melt to a liquid crystal phase, which decomposes before the clearing point. The exception is the propanoate homologue, which decomposes directly from the solid state. Despite this problem of sample decomposition, the identification by optical microscopy of the tetragonal ( butanoate) and hexagonal ( pentanoate and hexanoate) discotic columnar phases was, for first time, possible by the addition of small amounts of the corresponding acid to the samples. These results are in agreement with the X-ray diffraction study performed using swelled mixtures of these salts with hydrocarbon solvents. Two solid - solid transitions, not previously reported in the literature, were found for the butanoate homologue at 395.9 and 422.9K with DeltaH = 8.27 and 1.37 kJ mol(-1), respectively. The solid and liquid crystalline phases were investigated using variable temperature FTIR spectroscopy
Il rischio di saturnismo negli uccelli necrofagi in relazione alle attuali modalità di caccia degli ungulati
No full textSummary Wildlife may be exposed to lead contamination as a consequence of hunting activities. Waterfowls
and grouses may directly assume lead from the ground (primary assumption), while in raptors lead
intoxication may be due to the ingestion of preys with elevated lead concentrations in their tissues (secondary
assumption). Recent studies demonstrated that viscera of shot ungulates are quite often directly contaminated
with lead due to bullet fragmentation after the shot. If released on the ground, viscera represent a
threat for scavenger species. In Europe, saturnism in birds of prey has been quite rarely described and some
reports are available for large raptors as griffon vulture Gyps fulvus, golden eagle Aquila chrysaetos and
bearded vulture Gypaetus barbatus. In the Alps this problem affects the abundant population of golden
eagle and the recently re-introduced population of bearded vulture that is still considered as vulnerable. For
the bearded vulture two cases of lead intoxication have already been described in dispersing juveniles. The
most viable nucleus of bearded vultures is distributed in the central Alps, between Italy and Switzerland
and is characterized by the highest reproductive rates. Hunting management of ungulates is here commonly
performed with lead ammunition. The practice of leaving on the ground the ungulate viscera after the shot is
still frequent. Hunting season partially overlaps with the most limiting season, in terms of food availability,
for birds. The extraordinary conservation value of this bearded vulture population led the Stelvio National
Park and the Sondrio Province to implement a study for monitoring the potential risk of lead intoxication
for raptors tied to the practice of ungulate viscera deposition after the shot. The viscera of 153 ungulates shot
in the Sondrio Province during hunting season 2009-2010 have been collected and examined to detect and
quantify lead presence. Information regarding the hunted animal, the type of ammunition, the condition
and the outcome of the shot have been collected as ancillary data. Lead fragments in the samples have been
investigated through CAT (computed axial tomography) and digital radiography and subsequently manually
collected. Overall, in 62.1% of samples lead fragments have been detected. Preliminary results refer
to a partial sample of 147 viscera of roe deer, red deer, chamois, wild boar and mouflon. Higher frequencies
have been recorded in roe deer (77.7%), chamois (69.6%) while lower in red deer (50%). The highest
frequencies of lead in viscera have been detected in ungulates shot in the thorax or in the thigh and hind
parts. These first preliminary outcomes confirm the high risk of lead intoxication for large raptors in areas
where ungulates are commonly hunted and demonstrate the need of more sustainable hunting practices as
the substitution of lead ammunition with non-toxic bullets or concealing under the ground the viscera of the
shot ungulates
Short chain copper(II) n-alkanoate liquid crystals
No full textFour short chain members of the copper(II) n-alkanoate series Cu(Cn)(2), from propanoate to hexanoate, have been synthesized, purified and characterized by means of optical microscopy, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), FTIR and Raman spectroscopy. The TGA study shows that decomposition starts on heating above 420 - 470K ( depending on the sample) in a nitrogen atmosphere. In addition, thermal decomposition was investigated by DSC using special high pressure pans and endo- and excthermic processes were found which have not been reported previously. All but one of the compounds melt to a liquid crystal phase, which decomposes before the clearing point. The exception is the propanoate homologue, which decomposes directly from the solid state. Despite this problem of sample decomposition, the identification by optical microscopy of the tetragonal ( butanoate) and hexagonal ( pentanoate and hexanoate) discotic columnar phases was, for first time, possible by the addition of small amounts of the corresponding acid to the samples. These results are in agreement with the X-ray diffraction study performed using swelled mixtures of these salts with hydrocarbon solvents. Two solid - solid transitions, not previously reported in the literature, were found for the butanoate homologue at 395.9 and 422.9K with DeltaH = 8.27 and 1.37 kJ mol(-1), respectively. The solid and liquid crystalline phases were investigated using variable temperature FTIR spectroscopy
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
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