Tag: "morphological" at biology news

Do you need sex to be a species?

... statistical techniques for combined molecular and morphological analyses of rotifers to test the notion that speci...re the case, they would expect to find genetic and morphological cohesion within independently evolving populations and divergence between them. To detect independen...

Evolutionary Medicine Meeting will advance a new scientific discipline

...are taking place at the genomic, physiological and morphological levels among individuals, families and populations, and to extend these results to prescribe medications based on natural relationships of individuals based on evolutionary principles." By catalyzing a synthesis between medicine and evolutionary bi...

Making no bones about it -- digestion in Burmese pythons

...e python gut after feeding. They observed drastic morphological changes, which coincided with a rapid increase in body temperature. Cell replication and death were sparked soon after feeding, as new cells were produced and worn out cells eliminated. In this way the stomach and intestine re-modelled themselves i...

NYU scientists identify how development of different species uses same genes with distinct features

...r 250 million years ago but one that presents many morphological similarities with flies in terms of development. The research teams results showed that flies and wasps employ most of the same genes and similar interactions among these genes, but some events are changed to adjust to the developmental constraints...

Robust time estimation reconciles views of the antiquity of placental mammals

...eper into the Cretaceous. Both paleontological and morphological studies suggest that the radiation of placental or...f the North American fossil record and traditional morphological views. They emphasize the necessity to scrutinize the implicit assumptions adopted by the models of ...

News tips from the Journal of Neuroscience

...ed Sef expression in mutant mice caused abnormal morphological development in some, but not all, animals. Mutant mice had normal auditory thresholds but reduced auditory brainstem responses. 3. The Ups and Downs of Cortical Activity Pavlos Rigas and Manuel A. Castro-Alamancos When it comes to rhythmic co...

UF scientists discover new genus of frogmouth bird in Solomon Islands

...ons from an earlier era. A combination of detailed morphological and genetic analyses reveal that this frogmouth formerly dismissed as just a race of an existing species actually cannot be placed confidently in any existing genus, and so the data demand naming a new one." Storrs Olson, a senior zoologist with ...

Scientists develope a new model of artificial canine skin

...us layers of the epidermis. The model develops a morphological structure similar to that of canine skin. Additionally, the expression of the dermis and epidermis proteins follows the same pattern of expression as that of normal canine skin, even forming a basal membrane, which also maintains the characteristics ...

Salt increases ulcer-bug virulence

...cells exposed to increased salt exhibited striking morphological changes: cells became elongated and formed long chains," says Gancz. "We conclude that H. pylori exposed to high levels of salt in vitro exhibit a defect in cell division." They also discovered transciption of two genes responsible for the virule...

Cold Spring Harbor Protocols features methods to understand embryos, clones, stem cells

.... The slices allow scientists to observe and test morphological and molecular changes that occur in a normally opaque embryo, and to see whats happening several layers deep into the embryo. The protocol is freely available at http://www.cshprotocols.org/cgi/content/full/2007/12/pdb.prot4749 ....

Evolutionary relevance of retinoic acid-induced craniofacial malformations

...t intriguing observation of this study is that the morphological characters obtained when treating embryos at slightly different developmental times resemble closely anatomical features found in other species. For example the authors describe the progressive transformation of ossicles of the middle ear into compon...

Marine worm opens new window on early cell development

...earchers wrote, appears to have retained ancestral morphological and genomic features, including a slowly evolving protein complement, and, therefore, can be considered a living fossil. Our studies of this organism, called a polychaete annelid, a marine relative of earthworms, have provided potentially fundament...

Rapid evolution of defense genes in plants may produce hybrid incompatibility

...re ecological factors such as reproductive season, morphological differences, and hybrid sterility. However, hybrid necrosis produced by autoimmune responses due to pathogen resistance genes has not been observed in animals and may represent a molecular pathway to speciation unique to plants. Knowledge of these ...

How to structure a complex body plan

...t, the branch and the colony. Despite the relative morphological simplicity of each module, branching corals can generate complex architectures at the colony level of organization. In a study published in the July 25 issue of the online, open-access journal PLoS ONE, a group of scientists led by Dr. Rinkevich f...

News tips from the Journal of Neuroscience

...Expression of constitutively active Pak1 disrupted morphological development of dendrites and axons; neurons did not survive past 7 DIV when Pak1 expression was silenced by RNA interference. 3. Toward an Auditory Midbrain Implant Hubert H. Lim and David J. Anderson Cochlear implants have revolutionized the...

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(Date:7/28/2014)... of Medicine have pinpointed a mechanism in part of the ... blood, linking it to both type 1 and type 2 ... of Proceedings of the National Academies of Sciences . ... located in a part of the hypothalamus known as the ... that control glucose levels in the blood," said lead author ...
(Date:7/28/2014)... the top 10 U.S. cities that have seen an ... as frequent road closures, overwhelmed storm drains and compromised ... NOAA technical report. , This nuisance flooding, caused by ... coasts, between 300 and 925 percent since the 1960s. ... Frequency Changes around the United States, also finds Annapolis ...
(Date:7/28/2014)... has identified areas of the Earth that are high ... , Europe is particularly vulnerable, as it has the ... cent, of any continent in ,refugia, areas of ... conditions remain relatively constant during times of great environmental ... mostly in Scandinavia and Scotland. , The biggest ...
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