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The karyotype and taxonomic status of Cryptomys hottentotus darlingi (Rodentia: Bathyergidae)
G.H. Aguilar
African Zoology , 2012,
Abstract: ENGLISH ABSTRACT:Cytogenetic analyses were performed on twenty specimens referable to Cryptomys hottentolus darlingi from north eastern Zimbabwe. In comparison to the southern subspecies C. h, hottentotus (aFN = 102) and C. h, natalensis (aFN = 100), C. h. darlingi showed the same diploid number (2n = 54), but a striking reduction in the fundamental number (aFN = 80). C-banding analysis suggests that chromosome differentiation arose most probably by pericentric inversions. The magnitude of the karyotypic differences is assumed to represent reproductive isolation and consequently the specific status for the darlingi cytotype is recommended. ********** AFRIKAANSE OPSOMMING: Sitogenetiese ontleding is uitgevoer op 20 individue van Cryplomys hottentolus darlingi van noord-oostelike Zimbabwe. In vergelyking met die suidelike subspesies C. h. hottentolus (aNF = 102) en C. h. natalensis (aNF = 100) vertoon C. h. darlingi dieselfde diplo'ide getal (2n = 54), en 'n verbasende vermindering in die nombre fondamental (aNF = 80). C-band-analise impliseer dat chromosoomdiHerensiering heel waarskynlik ontstaan het deur middel van perisentriese inversies. Daar word aangeneem dat die grootte van die kariotiepverskille reproduktiewe isolasie verteenwoordig, en gevolglik word spesifieke status vir die darlingi sitotipe aanbeveel.
The reproductive biology of the giant Zambian mole-rat, Cryptomys mechowi (Rodentia: Bathyergidae)
N.C. Bennett,G.H. Aguilar
African Zoology , 2011,
Abstract: Cryptomys mechowi occurs in the mesic Miombo tropical woodland and savanna of Zambia, Za'ire and Angola. It is a colonial bathyergid in which reproduction is restricted to a single female. Courtship and copulation are initiated by the female. Copulation is brief and does not involve multiple bouts. The gestation length is 97-111 days (n 2). The newborn pups are altricial and the litter sizes small, averaging 1,6 ± 0,5 (n 5). The pups begin to wander out of the nest when 10 days old, begin to eat solids after 20 days and are fully weaned after 35 days. The growth of C. mechawi pups is best described by the Gompertz model. The growth rate for the first 80 days of postnatal growth is 0,8 to 0,94 g/day, whereas for the first 275 days this rate is 0,7 to 0,84 g/day. The reproductive biology of the giant Zambian mole-rat is compared with that of other species of southern and central African Cryptamys.
Burrow casts from the Lystrosaurus-Procolophon Assemblage-zone, Karoo Sequence, South Africa
G.H. Groenewald
Koedoe : African Protected Area Conservation and Science , 1991, DOI: 10.4102/koedoe.v34i1.409
Abstract: Five types of burrow casts from the Lystrosaurus- Procolophon Assemblage-zone (Palingkloof Member and Katberg Formation, Triassic, Karoo sequence. South Africa) are associated with casts of desiccation cracks and red mudstone. Vertebrate remains of Lystrosaurus sp. and Procolophon sp. indicate that these animals probably made the burrows during the Triassic. It is possible that burrowing was an adaptive advantage during periods of severe and unfavourable climatic conditions. Similar burrow casts were found in the Dicynodon-Theriognathus Assemblage-zone, suggesting a burrowing habit for fauna represented in this zone. In structure, the burrow casts resemble those of Scoyenia, Thalassinoides, Histioderma, Gyrolithes and Planolites reported from Germany, France, Asia, Ireland, Spain and the United States of America.
Geology of the Golden Gate Highlands National Park
G.H. Groenewald
Koedoe : African Protected Area Conservation and Science , 1986, DOI: 10.4102/koedoe.v29i1.529
Abstract: The Golden Gate Highlands National Park is underlain by stratigraphic units belonging to the upper part of the Karoo Sequence. These units include part of the Beaufort Group and the Molteno, Elliot, Clarens and Drakensberg Formations. Dolerite dykes and sills are intruded into the succession while recent alluvium and scree cover the valley floors and mountain slopes. The Beaufort Group is represented by red mudstone and light brown fine-grained feldspathic sandstone of the Tarkastad Subgroup. The Molteno Formation consists of medium- to coarse-grained trough cross-bedded sandstone, while the Elliot Formation comprises a thick succession of red mudstone, siltstone and interlayered fine- to medium-grained, light yellow-brown sandstone. The most characteristic feature of the park is the yellowish sandstone cliffs of the Clarens Formation. Cave formation is caused by exudation, differential weathering due to different degrees of carbonate cementation and undercutting of the sandstone. The highest peaks are capped by numerous layers of amygdaloidal and massive varieties of basaltic lava of the Drakensberg Formation. A possible volcanic pipe occurs in the eastern part of the park. The Elliot and Clarens Formations are rich in vertebrate fossil remains, especially Massospondylus sp. Remains of Notochampsa sp., Pachygenelus monus, Clarencea gracilis, Lanasaurus scalpridens and a cluster of unidentified dinosaur eggs have also been found. The formations underlying the Golden Gate Highlands National Park were formed during the Late Triassic Epoch and the Jurassic Period (roughly 150 to 230 million years ago). The strata in the park show very little structural deformation and the only obvious structures are faults which are intruded by dolerite.
’n Regsteoretiese en funks ionele perspektief op die beste belange van die (minderjarige) kind
G.H. Fick
Koers : Bulletin for Christian Scholarship , 1991, DOI: 10.4102/koers.v56i1.731
Abstract: In most modern legal systems the principle of the child’s best interests is held to be the panacea for adjudication in cases of interference within an intact family unit or remediation whenever the family is split apart. But with the same conviction one has to say that the principle is not sofinely tuned. As a simple rule of decision it must be rejected , because its content oscillates between it being a (paramount?) consideration amongst others and it being a norm depicting and weighing competing interests (rights). It is the premise of this article that even though the principle is indeterminate it can be made meaningful as an explicit criterion (amongst others) for adjudication only in cases where the court has already intervened within a parent-child relationship and wishes to resolve the whole issue as efficaciously as possible. It is further suggested that the principle should not be applied when there is state intervention in an intact family unit. Under these circumstances the best inte re st of the child and the preservation of family life result in an undeniable paradox. The tension cannot be resolved by applying the superficially simple rule of decision, namely the child’s best interest. A more exact test needs to be applied to remove some of the anomalies and uncertainties of the well-known concept. The author of this article suggests an approach of a more delictual nature. The question needs to be answered at what stage does it become unlawful for parents to infringe upon their child’s (subjective) rights or breach their legal duties towards their child, justifying court intervention in the family unit. The (positive) law has not specifically determined this boundary of (objective) unreasonable conduct and one has to rely on indicia relevant to a particular case, in accordance with the convictions of the community, such as the special relationship between the parties, the particular conflicting interests of the parties, the motives of the parlies, and appropriate considerations of social policy. In this way the concept (of the child’s best interests) can be simplified and elucidated.
Biological Control of Ryegrass in Wheat Fields by New Isolate of Urocystis agropyri
G.H. Ibrahim
Plant Pathology Journal , 2007,
Abstract: The capability of Urocystis agropyri as a bioagent to control ryegrass in wheat fields was examined. Non-significant difference between the wheat production sown in soil inoculated and non-inoculated with the isolate of U. agropyri, but highly differences were recorded when wheat and ryegrass sown together in soil inoculated and non-inoculated with this isolate. The results indicated that ryegrass had a significant negative effect on the productivity and yield components of wheat. The productivities of wheat were 2402 and 2362 kg ha-1 for only wheat sown in soil non-inoculated and inoculated with U. agropyri, while they were 1184 and 690 kg ha-1 for wheat and ryegrass sown in soil inoculated and non-inoculated with the isolate of U. agropyri, respectively. This confirms that ryegrass had a significant negative effect for wheat productivity and the isolate of U. agropyri can be used as a biological agent to control this weed in order to increase the productivity of wheat.
Growth Of Dermatology In India
Percival G.H
Indian Journal of Dermatology , 2001,
Abstract:
Jean-Baptiste Tierce and the Batavian Replubic
G.H. Homan
Nieuwe West-Indische Gids , 1976,
Abstract:
Sir Arnold Theiler and the discovery of anaplasmosis : a centennial perspective : tick-borne diseases
G.H. Palmer
Onderstepoort Journal of Veterinary Research , 2010, DOI: 10.4102/ojvr.v76i1.68
Abstract: Sir Arnold Theiler's research in 1908/09 led to the discovery of the first rickettsial pathogen, Anaplasma marginale, and set the stage for his development and implementation of an effective live vaccine based on a less virulent strain, A. marginale ss. centrale. His 1910 report, describing A. marginale, is among the classic monographs in infectious disease research, presenting not only observations in exacting detail but also highlighting the deductive reasoning leading to association of a new pathogen with a specific disease. With a centennial perspective and both conceptual frameworks and molecular tools unimaginable in Theiler's time, the significance of several observations in the original report - cyclic bacteremia, strain superinfection, and taxonomic position - is now clear and highlight the broad applicability of key principles of pathogen biology.
Knowledge and Technology Transfer . A case study: Linkage Between College of Agriculture of Shiraz University and Extension Service in Fars Province
G.H. Zamani
Journal of Science and Technology of Agriculture and Natural Resources , 2000,
Abstract: Agricultural colleges have three main objectives: training, research, and offering public services. Transfer and dissemination of agricultural knowledge and technology is the best example of universities’ services. In this regard, agricultural extension has the important role of linking agricultural colleges with agricultural industry. The linkage between extension and agricultural colleges is effective in promoting the two organizations and ultimately enhancing the development of agriculture. Therefore, the significance of this linkage has been emphasized by many program planners as well as researchers. This descriptive research was conducted to analyze the perception of the faculty members at Agricultural College of Shiraz University and the extension agents and specialists of Fars Province. A theoretical framework was developed based on a “communication model”, and forty-seven factors effective in establishing and promoting the linkage between research and extension were recognized. The results revealed that the most important factor in research-extension linkage is “the degree of contact and knowledge of local agricultural affairs by researchers”. The paper concludes by providing recommendations that could be used to strengthen the interaction between research and extension institutions.
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