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https://www.readbyqxmd.com/read/27924847/a-late-paleocene-probable-metatherian-deltatheroidan-survivor-of-the-cretaceous-mass-extinction
#1
Xijun Ni, Qiang Li, Thomas A Stidham, Lüzhou Li, Xiaoyu Lu, Jin Meng
Deltatheroidans are primitive metatherian mammals (relatives of marsupials), previously thought to have become extinct during the Cretaceous mass extinction. Here, we report a tiny new deltatheroidan mammal (Gurbanodelta kara gen. et sp. nov.) discovered at the South Gobi locality in China (Xinjiang Province) that is the first Cenozoic record of this clade and renders Deltatheroida a Lazarus taxon (with a new record 10 million years younger than their supposed extinction). The vertebrate fauna associated with Gurbanodelta is most similar to that from the slightly older late Paleocene Subeng locality in Inner Mongolia...
December 7, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27896530/maxillary-sinus-mucocele-predisposing-factors-clinical-presentations-and-treatment
#2
Mosaad Abdel-Aziz, Hassan El-Hoshy, Khaled Azooz, Nader Naguib, Ahmed Hussein
PURPOSE: Maxillary sinus mucocele (MSM) is uncommon lesion and has many presenting features. The aim of this study was to detect the possible predisposing factors, clinical characteristics, and to assess the efficacy of trans-nasal endoscopic treatment of this lesion. METHODS: This retrospective multicenter study was conducted on 36 patients with MSM, the diagnosis of the disease was based on computed tomographic criteria. The patients' history, presenting features, and surgical management were reviewed...
November 28, 2016: Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/27889918/inner-ear-labyrinth-anatomy-of-monotremes-and-implications-for-mammalian-inner-ear-evolution
#3
Julia A Schultz, Ulrich Zeller, Zhe-Xi Luo
The monophyletic clade Monotremata branches early from the rest of the mammalian crown group in the Jurassic and members of this clade retain many ancestral mammalian traits. Thus, accurate and detailed anatomical descriptions of this group can offer unique insight into the early evolutionary history of Mammalia. In this study, we examine the inner ear anatomy of two extant monotremes, Ornithorhynchus anatinus and Tachyglossus aculeatus, with the primary goals of elucidating the ancestral mammalian ear morphology and resolving inconsistencies found within previous descriptive literature...
November 27, 2016: Journal of Morphology
https://www.readbyqxmd.com/read/27881865/bandicoot-fossils-and-dna-elucidate-lineage-antiquity-amongst-xeric-adapted-australasian-marsupials
#4
Benjamin P Kear, Ken P Aplin, Michael Westerman
Bandicoots (Peramelemorphia) are a unique order of Australasian marsupials whose sparse fossil record has been used as prima facie evidence for climate change coincident faunal turnover. In particular, the hypothesized replacement of ancient rainforest-dwelling extinct lineages by antecedents of xeric-tolerant extant taxa during the late Miocene (~10 Ma) has been advocated as a broader pattern evident amongst other marsupial clades. Problematically, however, this is in persistent conflict with DNA phylogenies...
November 24, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27873145/use-of-refrigerant-spray-of-a-propane-butane-isobutane-gas-mixture-in-the-management-of-keratocystic-odontogenic-tumors-a-preliminary-study
#5
Eduardo Luis de Souza Cruz, Ana Karla da Silva Tabosa, Aline Semblano Carreira Falcão, Talita Tartari, Lucas Machado de Menezes, Edmar Tavares da Costa, José Thiers Carneiro Júnior
PURPOSE: Keratocystic odontogenic tumor (KCOT) is an aggressive benign tumor and the management by complete enucleation followed by cryotherapy maintains the inorganic bone matrix, resulting in better repair and reduces the rates of recurrence. A refrigerant spray with a propane/butane/isobutane gas mixture has been pointed to as an alternative to liquid nitrogen, because the device is easy to handle and contain within the cavity, providing better control and lower risk of injury to the adjacent soft tissue...
November 21, 2016: Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/27863094/resources-for-phylogenomic-analyses-of-australian-terrestrial-vertebrates
#6
Jason G Bragg, Sally Potter, Ke Bi, Renee Catullo, Stephen C Donnellan, Mark D B Eldridge, Leo Joseph, J Scott Keogh, Paul Oliver, Kevin C Rowe, Craig Moritz
High throughput sequencing methods promise to improve our ability to infer the evolutionary histories of lineages and to delimit species. These are exciting prospects for the study of Australian vertebrates, a group comprised of many globally unique lineages with a long history of isolation. The evolutionary relationships within many of these lineages have been difficult to resolve with small numbers of loci and we now know that many lineages also exhibit substantial cryptic diversity. Here, we present a set of phylogenetically diverse transcriptome resources to enable exon-based sequence capture studies of Australian vertebrates, including transcriptome sequences for 4 species of birds, 4 frogs, 7 lizards and 7 mammals...
November 8, 2016: Molecular Ecology Resources
https://www.readbyqxmd.com/read/27853588/oldest-fossil-remains-of-the-enigmatic-pig-footed-bandicoot-show-rapid-herbivorous-evolution
#7
Kenny J Travouillon
The pig-footed bandicoot, Chaeropus ecaudatus, is one of the most enigmatic Australian marsupials, which went extinct in the late 1950s probably as a result of European colonization. It is unusual in being the only marsupial to have evolved reduction of digits on both fore and hind feet, with the forefeet being pig-like (two toes) and the hind feet being horse-like (one toe). According to molecular phylogenetic analyses, Chaeropus diverged from other bandicoots (Peramelidae), and the bilbies (Thylacomyidae) by the mid-Late Oligocene...
August 2016: Royal Society Open Science
https://www.readbyqxmd.com/read/27852732/cortical-plasticity-following-stripe-rearing-in-the-marsupial-monodelphis-domestica-neural-response-properties-of-v1
#8
James C Dooley, Michaela S Donaldson, Leah A Krubitzer
The functional organization of the primary visual area (V1) and the importance of sensory experience in its normal development have been well documented in eutherian mammals. However, very few studies have investigated the response properties of V1 neurons in another large class of mammals, or whether sensory experience plays a role in shaping their response properties. Thus, we reared opossums (Monodelphis domestica) in normal and vertically striped cages until they reached adulthood. They were then anesthetized using urethane, and electrophysiological techniques were used to examine neuronal responses to different orientations, spatial and temporal frequencies, and contrast levels...
November 16, 2016: Journal of Neurophysiology
https://www.readbyqxmd.com/read/27847742/conservative-approach-to-recurrent-calcifying-cystic-odontogenic-tumor-occupying-the-maxillary-sinus-a-case-report
#9
Yongsoo Kim, Bo Eun Choi, Seung-O Ko
Calcifying cystic odontogenic tumor (CCOT) is an uncommon benign cystic neoplasm of the jaw that develops from the odontogenic epithelium. Invasion into the maxillary sinus by a CCOT is not a typical, and the recurrence of the cystic variant of CCOT in the posterior maxilla is rare. This report describes a recurrent CCOT occupying most of the maxillary sinus of a 24-year-old male patient. As a treatment, marsupialization was carried out as a means of decompression, and the involved teeth were all endodontically treated...
October 2016: Journal of the Korean Association of Oral and Maxillofacial Surgeons
https://www.readbyqxmd.com/read/27847737/treatment-of-nevoid-basal-cell-carcinoma-syndrome-a-case-report
#10
Dong-Uk Seo, Su-Gwan Kim, Ji-Su Oh, Jae-Seek You
Nevoid basal cell carcinoma syndrome (NBCCS), also known as Gorlin syndrome, is characterized by various embryological deformities and carcinoma formation. It is caused by PTCHI gene mutations and is autosomal dominantly inherited. Some of the main symptoms of NBCCS are multiple basal cell carcinomas, multiple keratocystic odontogenic tumors (KCOTs) of the mandible, hyperkeratosis of the palmar and plantar, skeletal deformity, calcification of the falx cerebri, and facial defomity. Recurrent KCOT is the main symptom of NBCCS and is present in approximately 90% of patients...
October 2016: Journal of the Korean Association of Oral and Maxillofacial Surgeons
https://www.readbyqxmd.com/read/27843264/mandibular-dentigerous-cyst-in-a-10-year-old-child
#11
Bindu Bhardwaj, Sunil Sharma, Punit Chitlangia, Prateek Agarwal, Amit Bhamboo, Komal Rastogi
: Dentigerous cyst is the most common odontogenic cyst. It is characterized by a unilocular radiolucent lesion that encloses permanent tooth buds or, under certain circumstances, displaced tooth buds. Buccal bony expansion and a missing tooth is the most common clinical feature. Various treatment modalities have been mentioned in the literature for management of dentigerous cysts. This article presents a left mandibular dentigerous cyst in a 10-year-old boy. Marsupialization was the treatment of choice and a denturelike space maintainer was provided...
July 2016: International Journal of Clinical Pediatric Dentistry
https://www.readbyqxmd.com/read/27833055/le-fort-i-osteotomy-to-enucleation-of-grand-proportions-fissural-cyst-presentation-of-case-report
#12
Rafael Correia Cavalcante, Fernanda Durski, Tatiana Miranda Deliberador, Allan Fernando Giovanini, Nelson Luís Barbosa Rebellato, Delson João da Costa, Leandro Eduardo Klüppel, Rafaela Scariot
Fissural cysts (FC) are caused by entraped epithelium between nasal and maxilar processes. They are commonly treated with surgical enucleation precedded or not by marsupialization depending on the cyst size. Biopsy of lesion is recommended due to confirm radiographic evaluation. It is rare to observe Le Fort I surgical approach to this type of injury. This study reports the case of an uncommon grand proportions fissural cyst in a female patient, 53, that was referred to the Oral and Maxillofacial Surgery Departament of Hospital XV presenting volume increase in maxilla associated with numbness of palate...
November 2, 2016: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/27830334/the-effect-of-body-mass-and-diet-composition-on-torpor-patterns-in-a-malagasy-primate-microcebus-murinus
#13
Sheena L Faherty, C Ryan Campbell, Susan A Hilbig, Anne D Yoder
One of the most obvious physiological changes accompanying seasonal heterothermy in mammals is a fattening stage preceding periods of resource scarcity. This phenomenon reflects the interplay of both diet and physiology. Though the accrual of fat stores is known to be essential for overwintering in some species, the influence of diet on the physiology of torpor is not fully understood. Results from captive studies in heterothermic rodents and marsupials have indicated that when autumn diets are enriched with polyunsaturated fatty acids (PUFAs), animals receiving these diets experience deeper and more frequent torpor bouts than their counterparts receiving a control diet...
November 9, 2016: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/27827336/a-new-coccidian-parasite-of-the-boodie-bettongia-lesueur-mammalia-marsupialia-potoroidae-from-australia
#14
Frances Hulst, Leah F Kemp, Jan Slapeta
Four of 28 wild boodies or burrowing bettongs, Bettongia lesueur (Quoy et Gaimard) passed oocysts of species of Eimeria Schneider, 1875. The boodies are surviving on off-shore islands and in large predator-proof sanctuaries on the mainland where they were reintroduced. The boodie is a potoroid marsupial extinct from the mainland of Australia due to predation from red foxes and feral cats. Comparison with other species of the genus Eimeria indicates that the coccidium found represents a new species. Sporulated oocyst of Eimeria burdi sp...
October 20, 2016: Folia Parasitologica
https://www.readbyqxmd.com/read/27825298/the-ut-family-of-mhc-class-i-loci-unique-to-non-eutherian-mammals-has-limited-polymorphism-and-tissue-specific-patterns-of-expression-in-the-opossum
#15
Katina V Krasnec, Anthony T Papenfuss, Robert D Miller
BACKGROUND: The Major Histocompatibility Complex (MHC) class I family of genes encode for molecules that have well-conserved structures, but have evolved to perform diverse functions. The availability of the gray, short-tailed opossum, Monodelphis domestica whole genome sequence has allowed for analysis of MHC class I gene content in this marsupial. Utilization of a novel method to search for MHC related domain structures revealed a previously unknown family of MHC class I-related genes...
November 8, 2016: BMC Immunology
https://www.readbyqxmd.com/read/27821189/ectoparasites-of-small-mammals-determinants-of-community-structure-in-south-american-savannah
#16
J Sponchiado, G L Melo, T F Martins, F S Krawczak, F C Jacinavicius, M B Labruna, D M Barros-Battesti, N C Cáceres
This study aimed to assess the contribution of hosts characteristics (rodents and marsupials) in the organization of ectoparasite communities present in woodland patches in western central Brazil. We verified the effect of host species, sex, body mass and vertical strata in addition to the role of seasonality on the ectoparasite composition, richness and abundance. The total sampling effort was 22 032 trap-nights equally distributed in 54 woodland patches. Variance partition and principal coordinate analysis were used to verify the existence of significant relationships between response variables and predictors...
November 8, 2016: Parasitology
https://www.readbyqxmd.com/read/27818824/fallopian-tube-torsion-as-a-cause-of-acute-pelvic-pain-in-adolescent-females
#17
Claudia Mueller, Sandra Tomita
Purpose. Torsion of the fallopian tube, involving hydatids of Morgagni, though a rare cause of acute pelvic pain in young girls, can pose significant risks to future fertility. Tubal torsion may present as a diagnostic dilemma since the ovary itself usually appears normal on ultrasound. Thus, surgical intervention may be delayed which can lead to worsening necrosis and result in the need for resection of the affected tube. Methods. We reviewed two cases of fallopian tube torsion associated with hydatids of Morgagni in adolescent females...
2016: Case Reports in Pediatrics
https://www.readbyqxmd.com/read/27806378/cultural-innovation-and-megafauna-interaction-in-the-early-settlement-of-arid-australia
#18
Giles Hamm, Peter Mitchell, Lee J Arnold, Gavin J Prideaux, Daniele Questiaux, Nigel A Spooner, Vladimir A Levchenko, Elizabeth C Foley, Trevor H Worthy, Birgitta Stephenson, Vincent Coulthard, Clifford Coulthard, Sophia Wilton, Duncan Johnston
Elucidating the material culture of early people in arid Australia and the nature of their environmental interactions is essential for understanding the adaptability of populations and the potential causes of megafaunal extinctions 50-40 thousand years ago (ka). Humans colonized the continent by 50 ka, but an apparent lack of cultural innovations compared to people in Europe and Africa has been deemed a barrier to early settlement in the extensive arid zone. Here we present evidence from Warratyi rock shelter in the southern interior that shows that humans occupied arid Australia by around 49 ka, 10 thousand years (kyr) earlier than previously reported...
November 2, 2016: Nature
https://www.readbyqxmd.com/read/27794571/inducing-sex-reversal-in-marsupial-mammals
#19
Keng Y Chew, Marilyn B Renfree
Marsupials are born with undifferentiated gonads, and their reproductive organs differentiate consecutively, not simultaneously as in eutherian mammals. Thus, in the main marsupial model, the tammar wallaby, Macropus eugenii, the testis forms cords 2 days after birth, the ovary develops cortex and medulla about 8 days after birth, the Wolffian duct enlarges from day 10, the prostate begins to form prostatic buds about 25 days after birth, and the phallus does not become sexually dimorphic until after 50 days postpartum (pp)...
October 29, 2016: Sexual Development: Genetics, Molecular Biology, Evolution, Endocrinology, Embryology, and Pathology of Sex Determination and Differentiation
https://www.readbyqxmd.com/read/27794390/the-phylogenetic-and-evolutionary-history-of-kokobera-virus
#20
Aletheia Blasi, Alessandra Lo Presti, Eleonora Cella, Silvia Angeletti, Massimo Ciccozzi
OBJECTIVE: To estimate the genetic diversity of Kokobera virus, the date of origin and the spread among different viruses in the endemic regions of Australia. METHODS: Two datasets were built. The first consisting of 29 sequences of the NS5/3' UTR region of Kokobera group downloaded from GenBank, the second including only 24 sequences of Kokobera viruses, focus is on this group. RESULTS: Bayesian time analysis revealed two different entries in Australia of Kokobera virus in the 50s years with the dated ancestor in 1861 year...
October 2016: Asian Pacific Journal of Tropical Medicine
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