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Tytuł:
Inflammation- and axotomy-induced changes in cocaine- and amphetamine-regulated transcript peptide-like immunoreactive (CART-LI) nervous structures in the porcine descending colon
Autorzy:
Burlinski, P.J.
Powiązania:
https://bibliotekanauki.pl/articles/32044.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
inflammation
axotomy
cocaine
amphetamine
peptide
enteric nervous system
nerve structure
pig
colon
Opis:
This study reports on changes in CART-like immunoreactive (CART-LI) nerve structures in the porcine descending colon during chemically driven inflammation and after axotomy. The distribution pattern of CART-LI nerve structures was studied using doublelabeling immunofluorescence technique in the circular muscle layer, myenteric (MP), outer submucous (OSP) and inner submucous plexuses (ISP) and also in the mucosal layer of the porcine descending colon in physiological conditions as well as under pathological factors. In the control animals, CART-LI perikarya have been shown to constitute 5.11% ± 0.64, 4.03% ± 1.17 and 0.05% ± 0.04 in MP, OSP and ISP, respectively. Changes in CART-immunoreactivity depended on the pathological factor and the part of the enteric nervous system (ENS) studied. Numbers of CART-LI perikarya amounted to 2.77% ± 0.64, 2.60% ± 0.36 and 0.26% ± 0.19 during chemically-induced colitis and 3.04% ± 0.88, 2.46% ± 0.8 and 0.43% ± 0.09 after axotomy in MP, OSP and ISP, respectively. Both studied pathological processes also caused an increase in the number of CART-LI nerve fibers in the circular muscle as well as in the mucosal layer.
Źródło:
Polish Journal of Veterinary Sciences; 2012, 15, 3
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Role of VIsE/C6 antigen as a marker for early Lyme borreliosis diagnosis and monitoring the effectiveness of its treatment
Znaczenie antygenu VIsE/C6 jako markera w diagnostyce wczesnej boreliozy z Lyme i badaniu skuteczności jej leczenia
Autorzy:
Krzemień, P.J.
Powiązania:
https://bibliotekanauki.pl/articles/2052673.pdf
Data publikacji:
2017
Wydawca:
Akademia Bialska Nauk Stosowanych im. Jana Pawła II w Białej Podlaskiej
Tematy:
VlsE
C6
Lyme borreliosis
Borrelia burgdorferi
serology
borelioza z Lyme
serologia
Opis:
Diagnosing Lyme borreliosis, despite years of standardization, continues to encounter difficulties. They result primarily from the lack of a good marker of active infection and one helpful in assessing the effectiveness of the treatment. So far, a certain diagnosis of Lyme borreliosis can be made only in a patient with erythema migrans (EM). Unfortunately, this symptom occurs only in some patients. According to the recommendations of the Polish Society of Epidemiologists and Doctors of Infectious Diseases, the effectiveness of treatment is determined by the disappearance of clinical symptoms. For this reason, for years, we have been looking for highly sensitive and diagnostically specific laboratory markers. These would allow for rapid identification of fresh infections with Borrelia spirochetes as well as simple monitoring of treatment efficacy. According to many of the recently published publications, the solution to the second of the presented problems may be the measurement of IgG antibodies to the surface antigen of Borrelia burgdorferi s.l. VlsE / C6.
Diagnostyka boreliozy z Lyme, pomimo iż od lat jest wystandaryzowana, nadal spotyka się z kilkoma problemami. Wynikają one przede wszystkim z braku dobrego markera aktywnej infekcji, oraz markera pomocnego w ocenie skuteczności leczenia. Jak dotąd, pewne rozpoznanie boreliozy z Lyme można postawić jedynie w przypadku wystąpienia u pacjenta rumienia wędrującego (EM - Erythema migrans). Niestety objaw ten występuje tylko u części pacjentów. Według rekomendacji Polskiego Towarzystwa Epidemiologów i Lekarzy Chorób Zakaźnych za podstawę oceny skuteczności leczenia uważa się zanik objawów klinicznych. Z tego powodu od lat poszukuje się markerów laboratoryjnych, które z wysoką czułością i specyficznością diagnostyczną pozwalałyby z jednej strony na szybkie rozpoznanie świeżych infekcji krętkami Borrelia, a z drugiej na proste monitorowanie skuteczności leczenia. Według wielu spośród pojawiających się w ostatnich latach publikacji rozwiązaniem drugiego z przedstawionych problemów może być pomiar przeciwciał IgG przeciwko antygenowi powierzchniowemu Borrelia burgdorferi s.l. VlsE/C6.
Źródło:
Health Problems of Civilization; 2017, 11, 2; 87-92
2353-6942
2354-0265
Pojawia się w:
Health Problems of Civilization
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hadrosaur trackways from the Lower Cretaceous of Canada
Autorzy:
Currie, P.J.
Powiązania:
https://bibliotekanauki.pl/articles/20808.pdf
Data publikacji:
1983
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
The most common ichnogenus in the Peace River Canyon is Amblydactylus, a large bipedal herbivore. The morphology of the hand and footprints suggest that the tracks and trackways were made by hadrosaurs, and the ichnites might represent the earliest record of these dinosaurs. Amblydactylus tracks were made in a wide variety of depositional environments, including the mud beneath several metres of water. Juveniles were gregarious and stayed together after hatching until they were large enough to join herds of more mature animals. Hadrosaur herds appear to have walked side by side, seldom crossing paths, although there was little structure to the herds when they were in the water and/or feeding. Calculation of the walking speeds indicate that the herbivores were generally slower than the carnivores.
Źródło:
Acta Palaeontologica Polonica; 1983, 28, 1-2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The access project: agro-climatic change and European soil suitability - a spatially distributed soil, agro-climatic and soil hydrological model
Autorzy:
Loveland, P.J.
Powiązania:
https://bibliotekanauki.pl/articles/24798.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
soil hydrology
soil erosion
soil
land
hydrological model
soil suitability
Europe
climate change
Źródło:
International Agrophysics; 1996, 10, 3
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positive and negative effects of trauma in patients after myocardial infarction: the role of type D personality
Autorzy:
Ogińska-Bulik, N.
Gurowiec, P.J.
Powiązania:
https://bibliotekanauki.pl/articles/2087937.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Opolski. Instytut Nauk o Zdrowiu
Tematy:
trauma
posttraumatic stress
posttraumatic growth
type D personality
myocardial infarction
Opis:
Background: Experiencing a myocardial infarction threatens the health and life of the patient; therefore, it can be perceived as a traumatic event. Indeed, myocardial infarction may result in negative consequences, including symptoms of posttraumatic stress disorder (PTSD). However, it is also possible to experience positive effects from traumatic events, which is expressed as posttraumatic growth. Personality characteristics, including type D (i.e., distressed) personality, are among several factors that have been shown determine the occurrence of negative and positive consequences after exposure to trauma. Aim of the study: The aim of the present study was to establish the role of distressed personality in the occurrence of negative and positive effects of trauma resulting from myocardial infarction. Material and methods: The study included a total of 80 patients after myocardial infarction. Sixty-three patients aged 43–85 years (M=67, SD=10.76) were included in the final analysis. The majority of respondents were men (61.9%). Patients completed a survey with three standardized measurement tools: the PTSD Checklist for DSM-5 (PCL-5), the Posttraumatic Growth Inventory (PTGI), and the Type D Scale (DS-14). Results: Negative affectivity was positively associated with PTSD symptoms, and this association was strongest for negative changes in cognition or mood. Social inhibition was not associated with PTSD symptoms, except for increased arousal and reactivity. Both dimensions of type D personality were positively related to one factor of posttraumatic growth: changes in the spiritual sphere. Conclusions: Reducing the severity of negative affectivity may decrease PTSD symptoms and thus contribute to improved psychosocial functioning among patients who have experienced myocardial infarction.
Źródło:
Medical Science Pulse; 2020, 14, 2; 49-54
2544-1558
2544-1620
Pojawia się w:
Medical Science Pulse
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical properties of some granular agricultural materials used in silo design
Autorzy:
Moya, M.
Aguado, P.J.
Ayuga, F.
Powiązania:
https://bibliotekanauki.pl/articles/26147.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Opis:
The aim of this research was to provide values for different material properties considered in either traditional or more recent numerical silo design methods. Different samples of granular agricultural materials commonly stored in silos were tested. Common geotechnical devices have been used in order to make the replications easier. Based on these experiments it was determined that the different material properties were not affected by the test velocity, except in the case of Poisson ratio. From a practical point of view, the test velocity correlates well with the sliding velocity of grain during discharge. The values obtained for material properties considered in traditional silo design methods were similar to those reported by other authors. No significant differences were observed in the results obtained when using either the square shear box or the circular shear cell. The same conclusion was reached when comparing the results from direct shear tests with preconsolidated and unconsolidated samples. This means that simplified devices and procedures can be used in agricultural grains against other products. Finally, a table with the recommended values for the different parameters determined for each sample tested was provided in this work.
Źródło:
International Agrophysics; 2013, 27, 2
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of utilization intensity on growth of lawn cultivars of Kentucky bluegrass (Poa pratensis L.)
Wpływ intensywności użytkowania na odrastanie trawnikowych odmian wiechliny łąkowej (Poa pratensis L.)
Autorzy:
Domanski, P.J.
Andrzejewska, J.
Iwicki, R.
Powiązania:
https://bibliotekanauki.pl/articles/46655.pdf
Data publikacji:
2011
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydawnictwo PB
Opis:
The aim of this study was to estimate the level of annual and daily growth of lawn plant height of Kentucky bluegrass cultivars depending on the intensity of their utilization and to group bluegrass cultivars into slowly and quickly growing. The basis for the study was the results of cultivar tests conducted by COBORU in 1998-2004 at three Experimental Stations of Cultivar Testing – Lisewo (54°06’ N; 18°50’ E), Łopuszna (49°29’ N; 20°08’ E) and Pawłowice (50°28’ N; 18°29’ E). Two systems of utilization were applied: moderately intensive (Relaks) and extensive (Park). At extensive utilization, annual plant growth values of all the tested cultivars were smaller by 20-30 cm, and average daily growth values by 0.14 cm smaller than with their intensive utilization. The slowly growing cultivars were Alicia, America, Baron, Bartender, Broadway, Limousine, NIB398, Orfeo, RAH498, Samoa and Qantum Leap, and quickly growing – Gol, Mardona, Haga, Sobra and Evora. At the utilization system Relaks, daily growth values of slowly growing cultivars were on average by 25% smaller, and at the Park system, by 35% smaller than those of quickly growing cultivars.
Celem badań było określenie poziomu rocznych i dobowych przyrostów wysokości roślin trawnikowych odmian wiechliny łąkowej w zależności od intensywności ich użytkowania oraz pogrupowanie odmian wiechliny na wolno i szybko odrastające. Podstawę opracowania stanowiły wyniki doświadczeń odmianowych prowadzonych przez COBORU w latach 1998-2004 w trzech Stacjach Doświadczalnych Oceny Odmian – Lisewie (54°06’ N; 18°50’ E), Łopusznej (49°29’ N; 20°08’ E) i Pawłowicach (50°28’ N; 18°29’ E). Stosowano dwa sposoby użytkowania: umiarkowanie intensywny (Relaks) i ekstensywny (Park). Przy ekstensywnym użytkowaniu roczne przyrosty roślin wszystkich testowanych odmian były o 20-30 cm, a średnie dobowe przyrosty o 0.14 cm mniejsze niż przy ich użytkowaniu intensywnym. Odmianami wolno odrastającymi były Alicia, America, Baron, Bartender, Broadway, Limousine, NIB398, Orfeo, RAH498, Samoa i Qantum Leap, a szybko odrastającymi – Gol, Mardona, Haga, Sobra i Evora. Przy sposobie użytkowania Relaks dobowe przyrosty odmian wolno odrastających były średnio o 25% mniejsze, a przy sposobie Park – o 35% mniejsze niż odmian szybko odrastających.
Źródło:
Acta Scientiarum Polonorum. Agricultura; 2011, 10, 3
1644-0625
Pojawia się w:
Acta Scientiarum Polonorum. Agricultura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CO-induced photoemission structures of the CO/Pt/Ru(0001) interface
Autorzy:
Godowski, P.J.
Onsgaard, J.
Li, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1058526.pdf
Data publikacji:
2016-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.60.Jv
33.60.+q
82.80.Pv
Opis:
The CO/Pt/Ru(0001) interface has been re-examined, in great detail, by photoelectron spectroscopy of high resolution under UHV conditions. The Ru(0001) substrate has been modified by platinum at coverages less than corresponding to the one, saturated, Pt overlayer, with no Pt/Ru intermixing. The analysis of the extent to which different regions of the photoelectron spectrum allow a detailed characterization of the interface is presented. The CO adsorption displays interaction with two separate phases: the Pt(111) face and the Ru(0001) surface.
Źródło:
Acta Physica Polonica A; 2016, 130, 6; 1389-1394
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Faunistic diversity of Maltese pocket sandy and shingle beaches: are these of conservation value?
Autorzy:
Gauci, M.J.
Deidun, A.
Schembri, P.J.
Powiązania:
https://bibliotekanauki.pl/articles/47728.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
fauna
littoral fauna
shingle beach
sandy beach
coastal conservation
Malta
Opis:
The littoral fauna of Maltese sandy and shingle beaches is generally regarded as impoverished and consequently of little conservation interest. The fauna of three sandy and three shingle beaches was systematically sampled by coring, standardised searching and pitfall traps. Diversity and population density were highest at the surface for sandy beaches, but were highest below the surface for shingle. The two beach types had distinct suites of species and individual beaches were faunistically distinct. Maltese sandy and shingle beaches are of conservation importance for their habitat-restricted species, some of which have limited local and regional distributions, and are internationally protected.
Źródło:
Oceanologia; 2005, 47, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variation in premaxillary tooth count and a developmental abnormality in a tyrannosaurid dinosaur
Autorzy:
Miyashita, T.
Tanke, D.H.
Currie, P.J.
Powiązania:
https://bibliotekanauki.pl/articles/23378.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
paleontology
tooth variation
premaxillary tooth
tooth
developmental abnormality
tyrannosaurid dinosaur
Dinosauria
Theropoda
Tyrannosauridae
tooth count
developmental regulation
Dinosaur Park Formation
Alberta city
Canada
Opis:
Premaxillary tooth count tends to be stable amongst toothed dinosaurs, and most theropods have four teeth in each premaxilla. Only one case of bilaterally asymmetric variation is known in theropod premaxillary dentition, and there is no record of ontogenetic or individual variation in premaxillary tooth count. Based on these observations, a tyrannosaurid left premaxilla with three teeth (TMP 2007.20.124) is an interesting deviation and represents an unusual individual of Daspletosaurus sp. with a developmental abnormality. The lower number of teeth is coupled with relatively larger alveoli, each of which is capable of hosting a larger than normal tooth. This indicates that tooth size and dental count vary inversely, and instances of reduction in tooth count may arise from selection for increased tooth size. On the other hand, the conservative number of premaxillary teeth in most theropods implies strong developmental constraints and a functional trade−off between the dimensions of the premaxillary alveolar margin and the size of the teeth. In light of recent advances in the study of tooth morphogenesis, tooth count is a function of two parameters: dimensions of an odontogenic field for a tooth series, and dimensions of tooth positions. A probable developmental cause for the low tooth count of TMP 2007.20.124 is that the dimensions of the alveoli expanded by approximately a third during tooth morphogenesis. Numerical traits such as tooth count are difficult to treat in a phylogenetic analysis. When formulating a phylogenetic character, a potential alternative to simply counting is to rely on the morphological signature for developmental parameters that control the number of the element in question.
Źródło:
Acta Palaeontologica Polonica; 2010, 55, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The teeth of the unenlagiine theropod Buitreraptor from the Cretaceous of Patagonia, Argentina, and the unusual dentition of the Gondwanan dromaeosaurids
Autorzy:
Gianechini, F.A.
Makovicky, P.J.
Apesteguia, S.
Powiązania:
https://bibliotekanauki.pl/articles/20408.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
tooth
unenlagiine theropod
theropod
Buitreraptor
Cretaceous
Patagonia
Argentina
dentition
Gondwanan dromaeosaurid
dromaeosaurid
Theropoda
Dromaeosauridae
Unenlagiinae
Dinosauria
paleontology
dinisaur tooth
Opis:
The Unenlagiinae is a clade of Gondwanan dromaeosaurid theropods mainly known from incomplete skeletal material. The group includes two recently discovered theropods, Buitreraptor and Austroraptor, from which cranial remains are available with in situ maxillary and dentary teeth, thus allowing the study of tooth morphology. Among the derived traits that diagnose the dentition of unenlagiines are: (i) high tooth count, (ii) small size of individual teeth when compared with skull height, (iii) absence of denticles and carinae, and (iv) presence of longitudinal grooves on the tooth crown. This suite of dental characteristics, shared between Buitreraptor and Austroraptor, can be considered as diagnostic of the Unenlagiinae or, at least, a more exclusive clade within the group. The teeth of Buitreraptor exhibit a remarkable labiolingual compression, whereas Austroraptor possesses more conical teeth, probably respective autapomorphic features. On one hand, these dental morphologies differ from those observed in most Laurasian dromaeosaurids and, for instance, could be considered as further proof of the purported vicariant evolution of the lineage on the southern continents. On the other hand, the morphological similarities (e.g., absence of denticles) between the teeth of unenlagiines and other theropod lineages, including Mesozoic birds and ornithomimosaurs, can be considered as the result of parallel trends related to dental reduction.
Źródło:
Acta Palaeontologica Polonica; 2011, 56, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selected risk factors for ischemic heart disease and the success of treatment in patients with STEMI myocardial infarction treated with percutaneous coronary intervention
Autorzy:
Jędrzejczyk-Cwanek, M.
Gurowiec, P.J.
Ozga, D.
Powiązania:
https://bibliotekanauki.pl/articles/2087710.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Opolski. Instytut Nauk o Zdrowiu
Tematy:
myocardial infarction
risk factors
ischemic heart disease
Opis:
Background: Coronary heart disease is one of the most common causes of hospitalization and premature deaths in Europe. ST-segment elevation myocardial infarction (STEMI) has been a clinical problem for many years, particularly in the aspect of choosing the optimal treatment method. The success of treatment is determined by many factors, including risk factors for ischemic heart disease, time between onset of symptoms and initiation of treatment, number and degree of coronary stenosis, and many more. Aim of the study: The aim of the study was to identify risk factors for ischemic heart disease affecting the success of STEMI patients treated with percutaneous coronary intervention (PCI). Material and methods: A retrospective analysis was carried out on data from medical records of patients treated in the Department of Acute Coronary Syndromes of St. Hedvig Provincial Hospital No. 2 in Rzeszow between 2009 and 2014. The research tool used in this paper was the author’s questionnaire. A total of 508 patients with STEMI myocardial infarction treated in the Department of Acute Coronary Syndromes (ACS) between 2009 and 2013 were included in the analysis. The inclusion criteria were the complete and clear files of patient treatment in the ACS department between 2009 and 2013 due to acute coronary syndrome treated invasively by the PCI method. Results: Majority of the study group, 334 subjects, (65.7%) had hypertension. The most common risk factors for ischemic heart disease were found to be dyslipidemia in 176 subjects (34.6%) and smoking in 163 subjects (32.1%). This paper presents the results of the analysis of the success of treatment in relation to risk factors for ischemic heart disease. There was a statistically significant relationship between hypertension and successful treatment (p=0.0425). More cases in which treatment was unsuccessful were observed in the group of patients who had no previous treatment for lipid disorders (20.2% vs. 4.0%) (p = 0.0000). Significantly more cases of treatment failure were found among people who denied smoking (17.4% vs. 8.6%; p = 0.0087). Conclusions: Among the analyzed behavioral and somatic risk factors for failure in patients subjected to treatment were untreated hypertension, hyperlipidemia and a negative history of cigarette smoking.
Źródło:
Medical Science Pulse; 2020, 14, 3; 49-54
2544-1558
2544-1620
Pojawia się w:
Medical Science Pulse
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New specimens of the crested theropod dinosaur Elmisaurus rarus from Mongolia
Autorzy:
Currie, P.J.
Funston, G.F.
Osmolska, H.
Powiązania:
https://bibliotekanauki.pl/articles/23110.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
new species
theropod dinosaur
dinosaur
Elmisaurus rarus
Dinosauria
Oviraptorosauria
Caenagnathidae
Elmisaurinae
Cretaceous
Mongolia
Opis:
New specimens of Elmisaurus rarus from the Upper Cretaceous of Mongolia (Nemegt Formation) preserve bones not previously found in “elmisaurids” that help elucidate their relationships to Leptorhynchos elegans and other oviraptorosaurs. Elmisaurus rarus and the North American Leptorhynchos elegans are known from numerous but incomplete specimens that are closely related to, but nevertheless clearly distinguished from, Chirostenotes pergracilis and Epichirostenotes curriei. These specimens include the first known cranial bone attributed to Elmisaurus, the frontal, which clearly shows this animal had a cranial crest (most of which would have been formed by the nasal bones). The first vertebrae, scapula, femora, and tibiae from Elmisaurus are also described. The Elmisaurinae can be distinguished from the Caenagnathinae by the coossification of the tarsometatarsus and smaller size at maturity. Examination of oviraptorosaur hindlimbs reveals four distinct morphotypes, possibly attributable to paleoecological differences.
Źródło:
Acta Palaeontologica Polonica; 2016, 61, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theropod teeth from the upper Maastrichtian Hell Creek Formation “Sue” Quarry: New morphotypes and faunal comparisons
Autorzy:
Gates, T.A.
Zanno, L.E.
Makovicky, P.J.
Powiązania:
https://bibliotekanauki.pl/articles/945614.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
paleontology
theropod
tooth
Upper Maastrichtian
Maastrichtian
Hell Creek Formation
morphotype
Dinosauria
morphometry
paleoecology
Cretaceous
North America
Opis:
Isolated teeth from vertebrate microfossil localities often provide unique information on the biodiversity of ancient ecosystems that might otherwise remain unrecognized. Microfossil sampling is a particularly valuable tool for documenting taxa that are poorly represented in macrofossil surveys due to small body size, fragile skeletal structure, or relatively low ecosystem abundance. Because biodiversity patterns in the late Maastrichtian of North American are the primary data for a broad array of studies regarding non-avian dinosaur extinction in the terminal Cretaceous, intensive sampling on multiple scales is critical to understanding the nature of this event. We address theropod biodiversity in the Maastrichtian by examining teeth collected from the Hell Creek Formation locality that yielded FMNH PR 2081 (the Tyrannosaurus rex specimen “Sue”). Eight morphotypes (three previously undocumented) are identified in the sample, representing Tyrannosauridae, Dromaeosauridae, Troodontidae, and Avialae. Noticeably absent are teeth attributed to the morphotypes Richardoestesia and Paronychodon. Morphometric comparison to dromaeosaurid teeth from multiple Hell Creek and Lance formations microsites reveals two unique dromaeosaurid morphotypes bearing finer distal denticles than present on teeth of similar size, and also differences in crown shape in at least one of these. These findings suggest more dromaeosaurid taxa, and a higher Maastrichtian biodiversity, than previously appreciated.
Źródło:
Acta Palaeontologica Polonica; 2015, 60, 1; 131-139
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New elmisaurine specimens from North America and their relationship to the Mongolian Elmisaurus rarus
Autorzy:
Funston, G.F.
Currie, P.J.
Burns, M.E.
Powiązania:
https://bibliotekanauki.pl/articles/22633.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
new species
Elmisaurinae
Dinosauria
Oviraptorosauria
Caenagnathidae
Campanian
Maastrichtian
North America
relationship
Mongolia
Elmisaurus rarus
Opis:
New specimens from Canada confirm the presence of elmisaurines in North America and shed light on the relationship of Leptorhynchos elegans to Mongolian forms. These specimens have hindlimb elements previously unknown from elmisaurines in the Dinosaur Park Formation, including tibiae and pedal phalanges. Metatarsal anatomy is sufficiently different to merit a generic distinction from Elmisaurus rarus, and both can be distinguished from Caenagnathus collinsi and Chirostenotes pergracilis. Differences between these taxa include body size, degree of coossification of the tarsometatarsus, and development of cruciate ridges of the metatarsal III. Histological analysis confirms that these differences are not correlated with ontogenetic age of the specimens. The results support the informal separation of caenagnathids based on metatarsal structure, and allow comments on paleobiological differences between caenagnathids and oviraptorids.
Źródło:
Acta Palaeontologica Polonica; 2016, 61, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 39

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