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| Registros recuperados: 193 | |
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| Ahmim Mourad; Moali Aissa. |
| Many bats of the Rhinolophidae family are currently threatened all over the world. In Algeria they are represented by six species listed in the IUCN red list and whose hunting habits and diet are, at best, poorly known. This paper describes the diet composition of four of these species (Rhinolophus ferrumequinum, R. hipposideros, R. euryale and R. blasii) in the Bejaia and Jijel districts, and in Kabylia of the Babors region, in northern Algeria. Between March 2007 and January 2008 guano was sampled every fortnight in the different sites used by the species and preys remains identified under microscope. Results show that these Algerian Rhinolophidae prey on three groups of Arthropodes (Insects, Chilopodes and Spiders) whose frequencies vary from one... |
| Tipo: Manuscript |
Palavras-chave: Developmental Biology; Ecology. |
| Ano: 2012 |
URL: http://precedings.nature.com/documents/6822/version/1 |
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| Alexander Ermolenko. |
| This work offers a new view on the developmental history of tetrapods. It proposes an original evolution model of human limbs based on metameric formation of osteogenic buds in accordance to primary segmentation and biplanar symmetry. While going through evolution, osteogenic buds initially identical to each other were changing their sizes, realigning, regressing, uniting while keeping the direction of the formation in accordance to the following formula (taking into account sesamoid bones):
2; 1; 2; 3; 2; 3; 5; 5; 8; 8 (in the upper limb together with the upper limb girdle); 3; 2; 3; 2; 1; 2; 8; 8; 5; 5 (in the lower limb together with the pelvic bones). |
| Tipo: Manuscript |
Palavras-chave: Developmental Biology; Evolutionary Biology. |
| Ano: 2011 |
URL: http://precedings.nature.com/documents/5539/version/1 |
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| Alexander Ermolenko; Elena A. Perepada. |
| Development of vertebrata begins with formation of a multicellular organism by ordered repeated division of a reproductive cell and nondisjunction of the new formed cells, which have kept connection by means of the extracellular matrix. Further there is a consecutive formation of organisms due to aggregation of similar structures: blastaea; segmentella, supersegmentella. Supersegmentella gave development to tunicates, hemichordates, chordates like lancelet and to predecessors of vertebrata. Segmentation of organisms is determined by aggregation of supergastraeas into one integrated. Symmetry is determined by structure-forming quality of extracellular matrix. Symmetry of primary organisms was radial; then radial-bilateral, and the first plane of symmetry... |
| Tipo: Manuscript |
Palavras-chave: Developmental Biology; Evolutionary Biology. |
| Ano: 2010 |
URL: http://precedings.nature.com/documents/4164/version/1 |
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| Alexander O. Vargas; Günter P. Wagner; Jacques A. Gauthier. |
| _Limusaurus_ is a remarkable herbivorous ceratosaur unique among theropods in having digits II, III and IV, with only a small metacarpal vestige of digit I. This raises interesting questions regarding the controversial identity of avian wing digits. The early tetanuran ancestors of birds had tridactyl hands with digital morphologies corresponding to digits I, II & III of other dinosaurs. In bird embryos, however, the pattern of cartilage formation indicates that their digits develop from positions that become digits II, III, & IV in other amniotes. _Limusaurus_ has been argued to provide evidence that the digits of tetanurans, currently considered to be I, II and III, may actually be digits II, III, & IV, thus explaining the... |
| Tipo: Manuscript |
Palavras-chave: Developmental Biology; Genetics & Genomics; Molecular Cell Biology; Evolutionary Biology. |
| Ano: 2009 |
URL: http://precedings.nature.com/documents/3828/version/1 |
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| Amanda J. Twomey; Bodapati P. Naidu; Shu Fukai. |
| It has been observed that _Melaleuca cuticularis_ Labill. has the ability to secrete salt solution to the surface of its stem. No literature has been found to illustrate other species' capacity to secrete salts at the stem and with what little literature there is on _M. cuticularis_ under saline conditions ^1, 2^, there was no evidence documented by those authors to have witnessed salt secreting at the stem. Most recorded observations of salt secretion by plants has usually been on leaf salt secretion through specialized glands or bladders often in mangroves, salt bushes and grass species, among others ^3-8^. This observation is the first known record of a plant species capable of secreting salts mostly at the stem. |
| Tipo: Manuscript |
Palavras-chave: Developmental Biology; Earth & Environment; Plant Biology. |
| Ano: 2008 |
URL: http://precedings.nature.com/documents/2450/version/1 |
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| Andres Ospina-Alvarez. |
| Breeding ecology and reproductive traits of Brown Booby _Sula leucogaster_ etesiaca in Gorgona Natural National Park, Colombia, were studied. Adults morphometrics, eggs dimensions, chicks growth and nesting site characteristics, were examined at three different locations in the park. As with other subspecies, Brown Booby in Gorgona presents inverted sexual dimorphism, with adult females being lengthier, wider and heavier than adult males. Breeding of S. l. etesiaca results in eggs from the first deposition bigger in weight and dimensions than eggs from the second or third deposition. Growth of brown boobies chicks fit to a natural log equation: bodymass(g) = 0.8773 ln(days) + 3.3895. A variety of spawning aggregations was found, and their relationship with... |
| Tipo: Manuscript |
Palavras-chave: Developmental Biology; Ecology; Earth & Environment. |
| Ano: 2011 |
URL: http://precedings.nature.com/documents/5620/version/1 |
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| Andrey Ptitsyn; Shane Kanatous. |
| *_Background:_* The metabolic transformation that changes Weddell seal pups born on land into aquatic animals is not only interesting for the study of general biology, but it also provides a model for the acquired and congenital muscle disorders which are associated with oxygen metabolism in skeletal muscle. However, the analysis of gene expression in seals is hampered by the lack of specific microarrays and the very limited annotation of known Weddell seal (_Leptonychotes weddellii_) genes.

*_Results:_* Muscle samples from newborn, juvenile, and adult Weddell seals were collected during an Antarctic expedition. Extracted RNA was hybridized on Affymetrix Human Expression chips. Preliminary studies showed a detectable... |
| Tipo: Manuscript |
Palavras-chave: Developmental Biology; Ecology; Bioinformatics. |
| Ano: 2009 |
URL: http://precedings.nature.com/documents/3380/version/1 |
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| Anthonie W. J. Muller. |
| Darwin already commented on the lateness in the fossil record of the emergence of the animals, calling it a valid argument against his theory of evolution^1^. This emergence of the animals (metazoans: multicellular animals) has therefore attracted much attention^2-5^. Two decades ago it was reported that extensive global glaciations (Snowball Earths) preceded the emergence^6-7^. Here we causally relate the emergence and the glaciations by invoking benthic sessile^8-11^ thermosynthesizing^12-13^ protists that gained free energy as ATP while oscillating in the thermal gradient between a submarine hydrothermal vent^14^ and the ice-covered ocean. During a global glaciation their size increased from microscopic to macroscopic due to the selective advantage of a... |
| Tipo: Manuscript |
Palavras-chave: Developmental Biology; Evolutionary Biology. |
| Ano: 2009 |
URL: http://precedings.nature.com/documents/3333/version/2 |
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| Anthonie W. J. Muller. |
| Darwin already commented on the lateness in the fossil record of the emergence of the animals, calling it a valid argument against his theory of evolution^1^. This emergence of the animals (metazoans: multicellular animals) has therefore attracted much attention^2-5^. Two decades ago it was reported that extensive global glaciations (Snowball Earths) preceded the emergence^6-7^. Here we causally relate the emergence and the glaciations by invoking benthic sessile^8-11^ thermosynthesizing^12-13^ protists that gained free energy as ATP while oscillating in the thermal gradient between a submarine hydrothermal vent^14^ and the ice-covered ocean. During a global glaciation their size increased from microscopic to macroscopic due to the selective advantage of a... |
| Tipo: Manuscript |
Palavras-chave: Developmental Biology; Evolutionary Biology. |
| Ano: 2009 |
URL: http://precedings.nature.com/documents/3333/version/1 |
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| Asuka Suzuki-Hirano; Tatsuya Sato; Harukazu Nakamura. |
| In the previous studies, we showed that strong Fgf8 signaling activates the Ras-ERK pathway to induce cerebellum. Here, we show importance of negative regulation of this pathway. 'Prolonged' activation of ERK by misexpression of _Fgf8b_ and dominant-negative _Sprouty2_ (_dnSprouty2_) did not change the fate of the mesencephalic alar plate. Downregulation of ERK activity using a MEK inhibitor, U0126, or by tetracycline dependent Tet-off system after co-expression of _Fgf8b_ and _dnSprouty2_, forced the mesencephalic alar plate to differentiate into cerebellum. We then paid attention to Mkp3. After misexpression of _dnMkp3_ and _Fgf8b_, slight downregulation of ERK activity occurred, which may be due to Sprouty2, and the mesencephalon... |
| Tipo: Manuscript |
Palavras-chave: Developmental Biology; Molecular Cell Biology; Neuroscience. |
| Ano: 2008 |
URL: http://precedings.nature.com/documents/2089/version/1 |
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| Aubie Shaw; Jerry Gipp; Wade Bushman. |
| The Hedgehog (Hh) pathway contributes to prostate cancer growth and progression. The presence of robust Shh expression in both normal prostate and localized cancer challenged us to explain the unique growth promoting effect in cancer. We show here that paracrine Hh signaling exerts a non-cell autonomous effect on xenograft tumor growth and that Hh pathway activation in myofibroblasts alone is sufficient to stimulate tumor growth. Nine genes regulated by Hh in the mesenchyme of the developing prostate were found to be regulated in the stroma of Hh over-expressing xenograft tumors. Correlation analysis of gene expression in matched specimens of benign and malignant human prostate tissue revealed a partial 5 gene fingerprint of Hh-regulated expression in... |
| Tipo: Manuscript |
Palavras-chave: Cancer; Developmental Biology. |
| Ano: 2009 |
URL: http://precedings.nature.com/documents/3682/version/1 |
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| Bruce Rothschild; Donald Neiffer; Steve Marks. |
| Pachydermatoperiostosis, a rare form of hypertrophic osteoarthropathy, is of unknown etiology and previously thought limited to humans. The only periosteal reaction previously reported in prosimians is related to renal disease. Notation of hypertrophic osteoarthritis in three prosimians led to recognition that this was the first non-human documentation of the disease. Three related red ruffed lemurs (Varecia variegatus rubra) had diaphyseal periosteal reaction classic for hypertrophic osteoarthropathy. Workup was negative for known underlying causes and for the secondary hyperparathyroidism which produces bone alterations in black Eulemur macao, black and white Varecia variegatatus varigatus and ringtail Lemur catta lemurs. Recognition of facial coarsening... |
| Tipo: Manuscript |
Palavras-chave: Developmental Biology; Evolutionary Biology. |
| Ano: 2011 |
URL: http://precedings.nature.com/documents/6374/version/1 |
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| Catherine Villard; Annie Andrieux. |
| Neuronal differentiation is under the tight control of biochemical and physical information arising from micro-environment. Here, through a panel of poly-L-lysine micropatterns, we wished to assay how external geometrical constraints of neurons may modulate axonal polarization. Constraints applied to either the cell body or to the neurite directions revealed the existence of a differential mechanical tension between the nascent axon and other neurites. Also, we show that centrosome location is not predictive of axonal polarization but responds to the force exerted by the nascent axon. Using curved trajectories for neurite growth inhibited axonal differentiation and prevented formation of multiple axons normally induced by cytochalasin or taxol treatments.... |
| Tipo: Manuscript |
Palavras-chave: Developmental Biology; Neuroscience. |
| Ano: 2011 |
URL: http://precedings.nature.com/documents/6021/version/1 |
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| Chalapathy K. Reddy; Vishal V. Naole. |
| Jatropha seed and oil yield is function of planting material used, growing conditions, plant architecture development and maintenance. Jatropha is hardy plant; thrives well in arid and semi arid regions with an average rainfall ranging from 500 to 1200 mm. It has been planted in varied soil types, marginal and waste lands; where in utilization of in situ resources by agronomic practices and development and management of canopy by pruning are very crucial for harvesting higher seed for biodiesel production. Building ideal canopy by pruning during first growing season is very important. Pruning is done during winter season when plants are in dormant condition. |
| Tipo: Manuscript |
Palavras-chave: Developmental Biology; Earth & Environment; Plant Biology; Evolutionary Biology. |
| Ano: 2009 |
URL: http://precedings.nature.com/documents/3700/version/1 |
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| Registros recuperados: 193 | |
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