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Wyświetlanie 1-7 z 7
Tytuł:
Kielantherium, a basal tribosphenic mammal from the Early Cretaceous of Mongolia, with new data on the aegialodontian dentition
Autorzy:
Lopatin, A
Averianov, A.
Powiązania:
https://bibliotekanauki.pl/articles/23180.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Kielantherium gobiense
Early Cretaceous
mammal
dentition
Cretaceous
Mammalia
Mongolia
Aegialodontia
Tribosphenida
tribosphenic mammal
paleontology
Opis:
Two additional specimens of the basal tribosphenid mammal Kielantherium gobiense, the first known aegialodont upper molar (possibly M2) and a dentary fragment with m1, are described from the Early Cretaceous Höövör locality in Mongolia. The upper molar shows an initial stage of the protocone development. Kielantherium gobiense has been known from two specimens only, and thus the new material doubles the hypodigm of this species. Kielantherium is clearly not a junior synonym of Aegialodon, as it differs from the latter in having a cusp−like mesiolabial cingulid cuspule f rather than prominent ridge−like precingulid. Kielantherium's lower postcanine dental formula (with four or more premolars and four molars) is distinctive and more primitive than in Peramus and Eutheria which have five premolars and three molars, and Metatheria which have three premolars and four molars.
Źródło:
Acta Palaeontologica Polonica; 2007, 52, 3
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Revision of a pretribosphenic mammal Arguimus from the Early Cretaceous of Mongolia
Autorzy:
Lopatin, A
Averianov, A.
Powiązania:
https://bibliotekanauki.pl/articles/23163.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Early Cretaceous
mammal
locality
Cretaceous
Arguimus khosbajari
tooth
Mongolia
Arguitherium cromptoni
Arguimus
identification
pretribosphenic mammal
Arguitherium
paleontology
Opis:
Arguimus khosbajari is redescribed, based on five additional specimens from the topotypic Early Cretaceous (Aptian– Albian) Höövör locality in Mongolia. The teeth preserved in the holotype of A. khosbajari are interpreted as p4–5, m1–3. The original identification of the teeth preserved in the holotype and single specimen of Arguitherium cromptoni from Höövör as p4–5, m1 is confirmed and this specimen is considered conspecific with A. khosbajari. Thus Arguitherium cromptoni Dashzeveg, 1994 and Arguitheriidae Dashzeveg, 1994 are junior subjective synonyms of Arguimus khosbajari Dashzeveg, 1979 and Arguimuridae Dashzeveg, 1994 respectively (syn. nov.). Arguimus is a stem−lineage zatherian characterized by the lower postcanine formula p1–5, m1–4, a premolariform p5, a “partially molariform” m1 having a widely open trigonid basin, trigonid cusps less angulated than in m2–4, a low and small paraconid, and a small but distinct metaconid, a single cusped talonid with an incipient talonid basin on m1–4, a distinct labial mandibular foramen, and total lack of the Meckel’s groove. A similar “partially molariform” m1 was apparently characteristic also for the stem−lineage zatherian Nanolestes from the Late Jurassic of Portugal, based on reinterpretation of the isolated tooth Gui Mam 1005, considered previously to be a deciduous premolar, and for Chunnelodon from the Early Cretaceous of England, described originally as an indeterminate dryolestoid, but referred here to as a stem−lineage zatherian.
Źródło:
Acta Palaeontologica Polonica; 2006, 51, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sauropod diversity in the Upper Cretaceous Nemegt Formation of Mongolia - a possible new specimen of Nemegtosaurus
Autorzy:
Averianov, A.O.
Lopatin, A.V.
Powiązania:
https://bibliotekanauki.pl/articles/945917.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
dinosauria
sauropoda
nemegtosaurus
upper cretaceous
nemegt formation
mongolia
Opis:
Currently, there are two sauropod taxa known from the Upper Cretaceous (Maastrichtian) Nemegt Formation of Gobi Desert, Mongolia: Nemegtosaurus from the Nemegt locality and Opisthocoelicaudia from the Altan Uul IV locality. Both taxa are represented by not overlapping elements (skull and partial postcranial skeleton respectively), which arises question on their possible synonymy. Five articulated sauropod dorsal vertebrae (PIN 3837/P821, dorsals 6–10) were found in 1949 by the Mongolian Expedition of the Academy of Sciences of the USSR at the Nemegt locality. This specimen is similar to Opisthocoelicaudia in having a strong ventral ridge on dorsal centra, a low neural arch which is anteroposteriorly narrowest at the junction with the centrum and widens dorsally, and lack of hyposphene–hypantrum articulations. PIN 3837/P821 differs from Opisthocoelicaudia by having the less dorsoventrally flattened dorsal centra, a shallow ventral concavity of dorsal centra in lateral view, a vertical posterior centrodiapophyseal lamina (pcdl) in dorsals 8 and 9, a postzygodiapophyseal lamina (podl) that roofs the centrodiapophyseal fossa (pocdf), and strongly developed accessory laminae within the parapophyseal centrodiapophyseal fossa (pacdf). The sauropod femora from Nemegt Formation differ from the femur of Opisthocoelicaudia by the medial condyle extending more distally compared with the lateral condyle. Most likely these femora and PIN 3837/P821 belong to Nemegtosaurus, which would make this taxon distinct from Opisthocoelicaudia by discussed characters of dorsal vertebrae and femur
Źródło:
Acta Palaeontologica Polonica; 2019, 64, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Skull structure in Catopsbaatar and the zygomatic ridges in multituberculate mammals
Autorzy:
Kielan-Jaworowska, Z
Hurum, J.H.
Lopatin, A.V.
Powiązania:
https://bibliotekanauki.pl/articles/22747.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
mammal
Cretaceous
Gobi Desert
Catopsbaatar catopsaloides
zygomatic ridge
Kryptobaatar
multituberculate
Djadochtatherium
Djadochtatheriidae
Mammalia
Campanian
paleontology
Multituberculata
Opis:
The late Campanian djadochtatherioid multituberculate Catopsbaatar catopsaloides was originally known from three skulls from Hermiin Tsav in the Gobi Desert (Mongolia). Three more skulls from Hermiin Tsav are now available, associated with parts of the previously unknown postcranial skeleton, which will be described separately. We describe herein the skull and dentition of C. catopsaloides, based on all available material, housed in PIN, PM, and ZPAL collections. The genera Catopsbaatar, Djadochtatherium, and Kryptobaatar share several characters, unknown in Tombaatar, such as very long postorbital processes directed postero−laterally and downwards, parietal ridges extending from the posterior margins of the postorbital processes postero−medially, and nuchal crests with prominent lateral wings, incurved anteriorly in the middle, so that the skull in dorsal view is shorter in the middle than laterally. Catopsbaatar shares with Djadochtatherium a very high and prominent anterior zygomatic ridge, and presence of the masseteric protuberance, but differs from it and from other djadochtatherioid genera in having the orbit situated more posteriorly, the intermediate zygomatic ridge adhering to the anterior ridge, and a smaller trapezoidal (rather than crescent−shaped) p4 without ridges; it differs from Kryptobaatar and Djadochtatherium in having three upper premolars (P2 being lost) and shares this last character with Tombaatar. Catopsbaataris known not only from Hermiin Tsav, but also from Baruungoyot Formation of Khulsan, represented there by a single m2. We demonstrate that the separation of the masseter superficialis into two parts, the origins of which leave scars on the lateral wall of the zygomatic arch surrounded by zygomatic ridges, occurs in all the multituberculates (beginning with Paulchoffatiidae), and is regarded as a multituberculate autapomorphy.
Źródło:
Acta Palaeontologica Polonica; 2005, 50, 3
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Discovery of Middle Jurassic mammals from Siberia
Autorzy:
Averianov, A O
Lopatin, A.V.
Skutschas, P.P.
Martynovich, N.V.
Leshchinskiy, S.V.
Rezvyi, A.S.
Krasnolutskii, S.A.
Fayngertz, A.V.
Powiązania:
https://bibliotekanauki.pl/articles/945775.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
docodonta
morganucodon
dentary
anatomy
bathonian
jurassic
siberia
Opis:
Mammal remains from the Middle Jurassic (Bathonian) Berezovsk Quarry on the south of Krasnoyarsk Territory, West Siberia, Russia are referred to Docodonta indet. (two edentulous fragmentary dentaries) and Mammalia indet. (a single−rooted tooth). The dentaries exemplify a unique combination of plesiomorphic characters found among stem mammals only in Docodonta and Morganucodon: well developed Meckel’s groove, trough for postdentary bones with overhanging medial ridge and a diagonal ridge on the floor separating the “adductor fossa” and angular facet, and well developed and posteroventrally directed pseudangular process with facet for the reflected lamina of angular. Both specimens share with Docodonta the prearticular facet placed ventral to the angular facet and extending posteriorly to the mandibular foramen. This facet is not present in Morganucodon, where the prearticular lies medial to the angular. Medial position of the prearticular in Morganucodon is connected with the compound jaw articulation in this genus, in which a rudimentary articular−quadrate mandibular joint is present medially to the dentary−squamosal joint. In Docodonta indet. from Berezovsk Quarry, Haldanodon and Docodon the position of the prearticular ventral to the angular is connected with the position of the articular complex ventral to the dentary condyle. Such articular complex could not function as a mandibular joint and postdentary bones in Docodonta were used solely for sound transmission. One specimen from Berezovsk Quarry shares with Morganucodon a groove for replacement dental lamina, which was not reported previously for Docodonta. Mammal remains from Berezovsk Quarry are among the oldest occurrences for Docodonta, the first record of Jurassic mammals for Siberia, and only second such record for the whole of Russia.
Źródło:
Acta Palaeontologica Polonica; 2005, 50, 4; 789-797
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New affinity sorbents for purification of recombinant proteins with the use of chitin-binding domain as an affinity tag
Autorzy:
Kurek, Denis V.
Lopatin, Sergey A.
Tikhonov, Vladimir E.
Varlamov, Valery P.
Powiązania:
https://bibliotekanauki.pl/articles/1035530.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
affinity chromatography
chitin based sorbents
chitin-binding domain
Opis:
With the increasing amounts of recombinant proteins production the problem of effective purification of produced proteins became one of major topics for research nowadays. Affinity chromatography proved to be the most dominant method for this aim and application of chitin based affinity sorbents in combination with use of chitin-binding domain as an affinity tag for purification of recombinant proteins showed its efficiency even in comparison with commercially available systems.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2010, 15; 41-46
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Formation and characterization of succinoyl chitosan particles loaded with warnerin
Autorzy:
Shagdarova, Balzhima Ts
Ilyina, Alla V.
Lopatin, Sergey A.
Korobov, Vladimir P.
Lemkina, Larisa M.
Varlamov, Valery P.
Powiązania:
https://bibliotekanauki.pl/articles/1034836.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
chitosan nanoparticles
coacervation method
succinoyl chitosan
warnerin
Opis:
This study aims to obtain nanoparticles based on succinoyl chitosan loaded with Warnerin (War-SCNPs), low molecular weight cationic peptide. The nanoparticles of succinoyl chitosan (SCNPs) were prepared by salt coacervation method, and Warnerin loading efficiency on SCNPs was reached 75% in the optimum conditions, particularly, ration (SCNPs : peptide) was equal to (1.75 : 1, μg / ml ). Formed War-SCNPs were stable, had a weak electric charge from (-4.4) to (-14,6) mV. Determining of SCNPs size showed that a main fraction of SCNPs had the size of 160 nm, and after the peptide sorption War-SCNPs size increased up to 330 nm. The experimental data of this study will likely impact War-SCNPs use as therapeutic delivery systems of the peptide to be administered parenteral.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2015, 20; 246-253
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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