First genetic analysis of a free-living population of the threatened goitered gazelle (Gazella subgutturosa)

2010 ◽  
Vol 75 (3) ◽  
pp. 277-282 ◽  
Author(s):  
Frank E. Zachos ◽  
Mahmoud Karami ◽  
Zahra Ibenouazi ◽  
Günther B. Hartl ◽  
Iris Eckert ◽  
...  
Keyword(s):  
Genetic Analysis ◽  
Free Living ◽  
Gazella Subgutturosa

scholarly journals An infanticide attempt by a free-roaming feral stallion ( Equus caballus )

2008 ◽  
Vol 5 (1) ◽  
pp. 23-25 ◽  
Author(s):  
Meeghan E Gray
Keyword(s):  
Sexual Selection ◽  
Genetic Analysis ◽  
Equus Caballus ◽  
Adult Males ◽  
Free Living ◽  
Feral Horses ◽  
Selection Hypothesis ◽  
Sexual Selection Hypothesis ◽  
In Captivity

Infanticide by adult males occurs in a variety of species. While infanticidal attacks have been documented in several equid species in captivity, it has never been witnessed in free-roaming feral horses. I report an infanticide attempt by a free-living feral stallion on a recently born female foal. The stallion picked up the foal by the shoulders, tossed it around twice and bit in on the neck several times. The dam of the foal charged the stallion and successfully protected her foal from additional attacks. The foal survived the attack and later weaned successfully. The stallion recently took over the band and was excluded as the sire through genetic analysis. While this type of attack is rare, this case lends support to the sexual selection hypothesis and further demonstrates that equids have evolved with the risk of infanticide. Furthermore, it shows that maternal protectiveness can be successful against attacks by infanticidal males.

Does size matter? Comparison of body temperature and activity of free-living Arabian oryx (Oryx leucoryx) and the smaller Arabian sand gazelle (Gazella subgutturosa marica) in the Saudi desert

2011 ◽  
Vol 182 (3) ◽  
pp. 437-449 ◽  
Author(s):  
Robyn Sheila Hetem ◽  
Willem Maartin Strauss ◽  
Linda Gayle Fick ◽  
Shane Kevin Maloney ◽  
Leith Carl Rodney Meyer ◽  
...  
Keyword(s):  
Body Temperature ◽  
Free Living ◽  
Arabian Oryx ◽  
Gazella Subgutturosa ◽  
Size Matter

Genetics of plant-microbe nitrogen-fixing symbiosis

1985 ◽  
Vol 85 (3-4) ◽  
pp. 239-252
Author(s):  
G. C. Machray ◽  
W. D. P. Stewart
Keyword(s):  
Nitrogen Fixation ◽  
Genetic Analysis ◽  
Symbiotic Nitrogen Fixation ◽  
Model System ◽  
Present Knowledge ◽  
Nitrogen Fixing ◽  
Free Living ◽  
Genetic Level ◽  
And Control ◽  
Control Of Expression

SynopsisA wide variety of plant-microbe nitrogen-fixing symbioses which include cyanobacteria as the nitrogenfixing partner exist. While some information has been gathered on the biochemical changes in the cyanobacterium upon entering into symbiosis, very little is known about the accompanying changes at the genetic level. Much of our present knowledge of the organisation and control of expression of nitrogenfixation (nif) genes is derived from studies of the free-living diazotroph Klebsiella pneumoniae. This organism thus provides a model system and source of experimental material for the genetic analysis of symbiotic nitrogen fixation. We describe the use of cloned K. pneumoniae genes for nitrogen fixation and its regulation in the genetic analysis' of nitrogen fixation in cyanobacteria which can enter into symbiosis with plants. These studies reveal some dissimilarities in the organisation of nif genes and raise questions as to the genetic control of nitrogen fixation in symbiosis.

Genetics: modes of reproduction and genetic analysis

Parasitology ◽  
2016 ◽  
Vol 144 (3) ◽  
pp. 316-326 ◽  
Author(s):  
ADRIAN STREIT
Keyword(s):  
Genetic Analysis ◽  
Reverse Genetics ◽  
Scientific Investigation ◽  
Model Organisms ◽  
Free Living ◽  
Two Generations

SUMMARYClassical and reverse genetics remain invaluable tools for the scientific investigation of model organisms. Genetic analysis of endoparasites is generally difficult because the sexual adults required for crossing and other manipulations are usually hidden within their host. Strongyloides spp. and Parastrongyloides spp. are notable exceptions to this and their free-living adults offer unique opportunities to manipulate these parasites experimentally. Here I review the modes of inheritance in the two generations of Strongyloides/Parastrongyloides and I discuss the opportunities and the limitations of the currently available methodology for the genetic analysis of these two genera.

A genetic analysis of reproduction in Strongyloides ratti

Parasitology ◽  
1994 ◽  
Vol 109 (4) ◽  
pp. 511-515 ◽  
Author(s):  
M. E. Viney
Keyword(s):  
Life Cycle ◽  
Genetic Analysis ◽  
Complex Life Cycle ◽  
Free Living ◽  
Parasitic Female ◽  
Allelic Segregation

SUMMARYStrongyloides ratti has a complex life-cycle with two adult generations, one free-living and dioecious and one parasitic and female only. The parasitic females reproduce by parthenogenesis, but it is unclear whether this is mitotic or meiotic in nature. This question has been addressed genetically by analysing the progeny of parasitic females that were heterozygous at an actin locus for evidence of allelic segregation. Such progeny were similarly heterozygous showing that segregation had not occurred. It was therefore concluded that reproduction in the parasitic female of S. ratti is functionally mitotic.

Azospirillum : genetics of nitrogen fixation and interaction with plants

1987 ◽  
Vol 317 (1184) ◽  
pp. 183-192 ◽  
Keyword(s):  
Nitrogen Fixation ◽  
Genetic Analysis ◽  
Dna Hybridization ◽  
Root Colonization ◽  
Homologous Region ◽  
Structural Genes ◽  
Free Living ◽  
Colonization Process ◽  
Large Plasmids ◽  
Bacterial Genes

Bacteria of the genus Azospirillum are free-living diazotrophs that were isolated from the rhizosphere and from the roots of grasses. Genetic analysis of nitrogen fixation was essentially initiated in A. brasilense Sp7, where genetic tools and mutants are available. A DNA region covering 25 kb and containing the nitrogenase structural genes ( nif HDK), nif E and another nif cluster has been cloned. In addition, the structural gene for glutamine synthetase, which might be involved in nif regulation, was cloned and sequenced. To identify bacterial genes involved in the root colonization process,DNA-DNA hybridization was performed with Rhizobium nodulation ( nod and hsn ) genes. Homology was detected in both cases and clones containing DNA homologous to hsn genes were isolated. Azospirillum contains large plasmids. Preliminary experiments suggest that the hsn homologous region is located on the 90 MDa plasmid of strain Sp7.

Ultrastructure of neuromuscular relationships in the canine heartworm (dirofilaria immitis)

1986 ◽  
Vol 44 ◽  
pp. 278-279
Author(s):  
W. L. Steffens ◽  
Nancy B. Roberts ◽  
J. M. Bowen
Keyword(s):  
Dirofilaria Immitis ◽  
Domestic Dogs ◽  
Structural Description ◽  
Pharmacological Effects ◽  
Free Living ◽  
Canine Heartworm ◽  
The World ◽  
Synaptic Region ◽  
Muscle Innervation ◽  
Insight Into

The canine heartworm is a common and serious nematode parasite of domestic dogs in many parts of the world. Although nematode neuroanatomy is fairly well documented, the emphasis has been on sensory anatomy and primarily in free-living soil species and ascarids. Lee and Miller reported on the muscular anatomy in the heartworm, but provided little insight into the peripheral nervous system or myoneural relationships. The classical fine-structural description of nematode muscle innervation is Rosenbluth's earlier work in Ascaris. Since the pharmacological effects of some nematacides currently being developed are neuromuscular in nature, a better understanding of heartworm myoneural anatomy, particularly in reference to the synaptic region is warranted.

Genetic analysis of a Japanese patient with butyrylcholinesterase deficiency

1997 ◽  
Vol 61 (6) ◽  
pp. 491-496 ◽  
Author(s):  
K. HIDAKA ◽  
I. IUCHI ◽  
M. TOMITA ◽  
Y. WATANABE ◽  
Y. MINATOGAWA ◽  
...  
Keyword(s):  
Genetic Analysis ◽  
Japanese Patient
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