(1) By contrast, the growth of the oocyte in relation to the follicle in monotremes in linear throughout the whole period of follicular growth.
(2) The mammals examined included 3 eutherian, 2 marsupial and a monotreme species and the reptiles 2 saurian, 1 crocodilian and 1 testudine species.
(3) Monotreme enamel has been interpreted as representing a structural stage intermediate between that of known multituberculates and extant tribosphenid mammals.
(4) No sex difference was observed in any monotreme tissue.
(5) The possible role these and the native rodents, marsupials and monotremes would play should an exotic disease of livestock enter Australia is discussed.
(6) A dorsal pterygoid element and a ventral ectopterygoid element can be recognised during the development of monotremes, marsupials and eutherian mammals.
(7) The ratio of the contents of the two major mammalian ganglioside fractions GD1a and GT1b is generally in the range of 1.0 and even higher; in the heterothermic platypus from the monotremes and in hibernators among the placental mammals, however, it is much lower (about 0.8).
(8) Because monotremes and marsupials diverged independently from eutherian mammals, this finding implies that the whole human X short arm region is a relatively recent addition to the X chromosome in eutherian mammals.
(9) Several lines of evidence suggest that electroreception has evolved independently in this monotreme.
(10) Since marsupials and monotremes diverged independently from eutherians, these data suggest that HSA 21 genes were originally located in two separate autosomal blocks.
(11) Here we establish that the platypus, the Australian nocturnal diving monotreme, can locate and avoid objects on the basis of d.c. fields.
(12) In monotremes the elements remain distinct and show specialised features, including a hamular cartilage in the ectopterygoid of one specimen of Ornithorhynchus.
(13) In order to extend comparative mapping studies to the monotreme mammals (subclass Prototheria), somatic-cell hybrids were obtained between Chinese-hamster cells deficient in hypoxanthine phosphoribosyltransferase (HPRT) and platypus fibroblasts.
(14) The amino acid sequence showed approximately 85 differences from mammalian, monotreme and bird myoglobins.
(15) There was no ligament of the femoral head in the hip joints of the monotremes, and it is suggested the absence of a ligament may be significant in the development of the cavity.
(16) The present study examines the cartilaginous epiphyses and physes from the knee and hip of the rat and the two Australian monotremes (platypus, Ornithorhynchus anatinus and echidna, Tachyglossus aculeatus).
(17) A region represented by the short arm of the human X is common to the X in all eutherians, but is autosomal in marsupials and monotremes; thus it was not a part of the original X, and must have been acquired by the X early in the eutherian radiation.
(18) The enamel of the fossil monotreme is prismatic and tubular and displays large areas of Pattern 2 prism packing.
(19) This estimate agrees well with similar estimates made using alpha- and beta-globin sequences, in contrast to widely differing estimates of dates of divergence for monotremes using the same three globin chains.
(20) Xenoantisera directed against human heavy chain isotypes allowed the serological identification of IgM and IgG immunoglobulins in the echidna (Tachyglossus aculeatus), a monotreme which is one of the most primitive species of extant mammals.
Platypus
Definition:
(n.) The duck mole. See under Duck.
Example Sentences:
(1) A 57-year-old man was envenomated via two spur wounds to the right hand from each hind leg of a male platypus.
(2) Recommendations are made to improve the survival of platypuses in captivity.
(3) It is as peaceful as a platypus playing with a potato pudding.” In 2007 Levy published Love and Sex with Robots , a book that one USA Today critic found “troublingly arousing”.
(4) Of 213 platypuses that died in captivity, 81.7% had died within 1 year; most within the first month.
(5) These findings suggest that the spleen is the primary hemopoietic organ in the platypus.
(6) Within the distinctive platypus beak, the animal had rows of sharp teeth, which scientists believe they used to slice and chew crayfish, frogs and small turtles.
(7) #Bellfie by Matt Collins, managing director at Platypus Digital The big craze for 2015 will be the #bellfie.
(8) The intestinal mucosa of the platypus takes the form of numerous transverse surface folds.
(9) These include animal embryos – platypus and wallaby – and specific body parts of other mammals, such as the arm of a koala.
(10) The most conspicuous features are: 1) although no protein casts are found in the tubular lumina, epithelial cells of the proximal convoluted tubule (PCT) have numerous electron-dense vesicles as in human nephrotic kidneys; and 2) the platypus Henle's loop consists of the thick epithelial cells similar to the mammalian type nephron of birds.
(11) Afferent responses were recorded from filaments of the trigeminal nerve in each of two platypuses (Ornithorhynchus anatinus) anaesthetized with alpha-chloralose.
(12) Two neurohypophysial peptides have been purified from acetone desiccated posterior pituitary glands of the platypus (Ornithorhynchus anatinus) by molecular sieving and high-pressure liquid chromatography.
(13) The karyotype of the platypus (2n = 52) has several features in common with those of the echidna species; six pairs of large autosomes, many pairs of small (but not micro-) chromosomes, and a series of small unpaired chromosomes which form a multivalent at meiosis.
(14) Neurohypophysial hormones of platypus seem similar to those of echidna, the other living prototherian, and to those of most placental mammals.
(15) The ratio of the contents of the two major mammalian ganglioside fractions GD1a and GT1b is generally in the range of 1.0 and even higher; in the heterothermic platypus from the monotremes and in hibernators among the placental mammals, however, it is much lower (about 0.8).
(16) As compared to those of other mammals such as humans and rats, our observations suggest that the platypus kidney is less developed, in terms of evolution.
(17) The platypus X chromosome, identified by the presence of two copies in females and one in males, has been found to possess a suite of genes that have been mapped to the X chromosomes of all eutherian and metatherian mammals.
(18) To describe in detail for the first time, the clinical course and medical management of a significant human envenomation by the Australian platypus (Ornithorhynchus anatinus).
(19) Methods used included SEM of methacrylate casts of marsupial enamel tubules, worn and cut surfaces of whole marsupial teeth, developing and erupted platypus teeth, and a well-developed molar of the newly discovered Miocene ornithorhynchid Obdurodon sp., and tandem scanning reflected light microscopy of intact marsupial teeth.
(20) The generation of blood cells has been observed in the spleen and in the bone marrow of the platypus.