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Search Results: 1 - 10 of 198183 matches for " N. Sitasuwan "
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Genetic Structure and Diversity of the Giant Frog (Limnonectes blythii) in Northern Thailand
C. Suwannapoom,W. Wongkham,N. Sitasuwan,C. Phalaraksh
Research Journal of Applied Sciences, Engineering and Technology , 2012,
Abstract: The aim of this study is to analyse genetic diversity, structure and differentiation of the giant frogs (Limnonectes blythii). One hundred and sixty four individuals from 4 populations in Mae Hong Son Province, Thailand were used for the analysis of genetic polymorphism at 7 microsatellite loci. The collection showed considerable polymorphism with observed number of alleles per locus ranging for seven different loci, with an average of 3.4 alleles per locus. Mean genetic diversity of the four populations with moderate level, but in populations with lower genetic diversity. Furthermore, the NJ tree approach clustering conWrmed the results of PAM is more differentiated than the others. The signiWcant levels of genetic structure among the sites were found in which could be resulting from isolation by distance rather than a position relative to habitat. The results of this study indicate that genetic structure could be useful for evaluation of neutral genetic variation particularly as the basis for inferring population and species capacity for species conservation and management decisions.
Evaluation of Hatchery Stock of Giant Frog (Limnonectes blythii) in Thailand
C. Suwannapoom,W. Wongkham,N. Sitasuwan,M. Osathanunkul
International Journal of Animal and Veterinary Advances , 2012,
Abstract: The aims of this work were to study the relationship between temperature and hatching rate and to evaluate genetic diversity of giant frog (Limnonectes blythii) as parental stock in Mae Hong Son Inland Fisheries Station, northern Thailand. The results showed that the optimal temperature for development of giant frog hatching ranged from 19 to 27oC, based on total hatch rate, viability of newly hatched larvae post-hatch, and total mortality rate of eggs. Moreover, from November to February, the greatest percentage of hatching was in January, with 40%. The outcome of determining the genetic diversity of parental generation by using seven microsatellite loci was moderately high levels.
Phylogenetic Relationship of Limnonectes (Anura: Dicroglossidae) in Thailand
C. Suwannapoom,W. Wongkham,N. Sitasuwan,S. Chomdej
Current Research Journal of Biological Sciences , 2012,
Abstract: The aims of this study was to relationship between systematic of fanged frogs are assessed by using the nuclear POMC gene from twenty three samples. It is suggested that there are three monophyletic groups in which the L. gyldenstolpei, L. hascheanus and L. limborgi were clustered together (group I); L. blythii (group II) and L. taylori, L. jarujini and L. megastomias (group III). Sequence analyses indicated that Limnonectes in Thailand has genetic diversity (h = 0.96, π = 0.045). Analysis of genetic distance on the basis of sequence differences for the POMC gene showed significant genetic difference data from phylogenetic analysis and revealed a very large genetic difference between species for the POMC gene sequences. It was also confirmed that the POMC gene is an effective unit for studying relationships in Limnonectes species.
Post-hatching Growth and Development of the Asian Paradise Flycatcher (Terpsiphone paradisi)
Pattamavadee Ngoenjun,Narit Sitasuwan
Research Journal of Biological Sciences , 2012,
Abstract: Parental care in birds may be provided by one sex or both depending on the maturity of the chicks at hatching and is provided especially to altricial nestlings. These often need both mother and father to provide food for them during their stay in nest. The amount of care the parents provide to the young affects their growth and development between hatching and fledgling and increases the chances of the nestlings surviving. Growth and development of the Asian Paradise Flycatcher were studied during the breeding season from 2005-2009 at Chiang Dao Wildlife Research Station, Chiang Mai Province and Khao Pra-Bang Khram Wildlife Sanctuary, Krabi and Trang Province. About 29 nestlings were measured (length of bill, unflattened wing and tarsus and body-weight) and their plumage development scored. All the measurements were highly correlated with the age of nestlings during their period in the nest except that body weight in the day before fledgling fell slightly. The body sizes of nestlings of Rufous-plumaged males with long central tail feathers (RL) and Rufous-plumaged males with short tails (RS) were also compared. The growth curves of nestlings of RL and RS males were nearly identical and there were no significant differences between them. The plumage developed gradually and was divided into 4 stages. The nestlings opened their eyes fully on day 7-8 and left the nest on day 10-11 before they were able fly properly. The nestlings made a begging call with their neck stretched out to try to reach the parent s bill and their gape opened so that their yellow palate was visible. A successful breeding cycle lasted 24-30 days including 2-4 days of egg-laying, 12-15 days of incubation and 10-11 days of parental care of nestlings in the nest. Fledgling success was 44.4%.
Bird Diversity Relative to Forest Types and Physical Factors at Tung Salang Luang National Park, Thailand
Auttpol Nakwa,Narit Sitasuwan,Araya Jatisatein,Porntip Chantaramongkol
Research Journal of Biological Sciences , 2008,
Abstract: A survey of bird diversity was carried out at Tung Salang Luang National Park in three forest types i.e. mixed forest (seasonal evergreen forest mixed with deciduous dipterocarp forest), seasonal evergreen forest and deciduous dipterocarp forest, during March 2004 to February 2005. The point count mixed line transect methods were used for data collection. The survey found 6,697 birds in total from 140 sp., 35 families and 11 orders occurring in the mixed forest, seasonal evergreen forest and deciduous dipterocarp forest were as follows: 107, 100 and 94 sp. The quantitative bird communities have a negative correlation with climatic changes, as a result, the dynamic pattern of bird populations in the 3 habitats during a year were similar. The fewest species numbers and individual numbers were found during the rainy season and slightly high during the late rainy to early cool seasons. The highest bird populations were found during cool season. Similarity index values of birds in both mixed forest and seasonal evergreen forest were the greatest similar, while both mixed forest and deciduous dipterocarp forest were fewest less similar. The 72.6-78.3% qualitative similarity index values of bird species between study sites was done. Mixed forest had the highest Shannon diversity index 3.9507, followed by deciduous dipterocarp and seasonal evergreen forest were 3.6387 and 3.6025, respectively. The pattern observed suggest that the structure and dynamics of the Tung Salang Luang bird community are strongly liked to physical factors and habitat heterogeneity. Two particular species of bird were observed in this study: Aviceda jerdoni (Jerdon` Baza) and Coracina javensis (Javan Cuckooshrike).
The Effects of Tourists on Bird Diversity in Tourist Area Compared to Restricted Area of Seasonal Evergreen Forest at Tung Salang Luang National Park, Phetchabun Province, Thailand
Auttpol Nakwa,Narit Sitasuwan,Araya Jatisatein,Porntip Chantaramongko
International Journal of Zoological Research , 2008,
Abstract: A survey of bird similarity, diversity and density were carried out at Tung Salang Luang National Park during March 2004 - February 2005, in 3 sites of seasonal evergreen forest, one site in a restricted area (SE1) and two sites in tourist areas (SE2 and SE3). Three sites were located in the same forest structure. The point count and line transect methods were used for data collection. The results revealed the following information: 133 species, 34 families and 11 orders of birds in SE1 (102 species), SE2 (100 species) and SE3 (89 species) were observed. Seven species of birds in all sites i.e. Criniger pallidus, Hypsipetes propinquus, Pycnonotus melanicterus, Irena puella, Garrulax leucolophus, Yuhina zantholeuca and Gracula religiosa were the co-dominant species in this forest that will be used indicator for future investigation. Base on similarity, tourist activities may be disturbed some bird groups in tourist area such as carnivorous and omnivorous (SE2 and SE3) and nectarivorous (SE3); base on densities, carnivorous (SE3), nectarivorous (SE2 and SE3) and garnivorous (SE3) were decreased 46-78 % in tourist sites compared with restricted site (SE1). Moreover, bird diversity index in restricted area was higher value than tourist area. This phenomenon indicated that some bird groups in tourist area at the seasonal evergreen forest had negative effect correlation with human activities and similarity, diversity and density indices were a proper indicator for further impact investigation for conservation and management strategies of avifauna. Finally, this result was the first report about avifauna dynamic of Tung Salang Luang National Park.
Bird Diversity Relative to Forest Types and Physical Factors at Tung Salang Luang National Park, Thailand
Auttpol Nakwa,Narit Sitasuwan,Araya Jatisatein,Porntip Chantaramongkol,Wasun Pupichit,Pornchai Srisakb
Research Journal of Biological Sciences , 2012,
Abstract: A survey of bird diversity was carried out at Tung Salang Luang National Park in three forest types i.e. mixed forest (seasonal evergreen forest mixed with deciduous dipterocarp forest), seasonal evergreen forest and deciduous dipterocarp forest, during March 2004 to February 2005. The point count mixed line transect methods were used for data collection. The survey found 6,697 birds in total from 140 sp., 35 families and 11 orders occurring in the mixed forest, seasonal evergreen forest and deciduous dipterocarp forest were as follows: 107, 100 and 94 sp. The quantitative bird communities have a negative correlation with climatic changes, as a result, the dynamic pattern of bird populations in the 3 habitats during a year were similar. The fewest species numbers and individual numbers were found during the rainy season and slightly high during the late rainy to early cool seasons. The highest bird populations were found during cool season. Similarity index values of birds in both mixed forest and seasonal evergreen forest were the greatest similar, while both mixed forest and deciduous dipterocarp forest were fewest less similar. The 72.6-78.3% qualitative similarity index values of bird species between study sites was done. Mixed forest had the highest Shannon diversity index 3.9507, followed by deciduous dipterocarp and seasonal evergreen forest were 3.6387 and 3.6025, respectively. The pattern observed suggest that the structure and dynamics of the Tung Salang Luang bird community are strongly liked to physical factors and habitat heterogeneity. Two particular species of bird were observed in this study: Aviceda jerdoni (Jerdon` Baza) and Coracina javensis (Javan Cuckooshrike).
Implementation of a Higher Quality dc Power Converter  [PDF]
N. N. Barsoum
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2010, DOI: 10.4236/jemaa.2010.22012
Abstract: Many single and three-phase converters are well developed, and covered up in most of electric markets. It is used in many applications in power systems and machine drives. However, an exact definite output signal from the dc side still not recognized. The waveforms of output voltage and current demonstrate an imperfect dc signal and constitute losses, harmonic distortion, low power factor, and observed some ripples. An approximately perfect rectifier bridge is the aim of this research. Perhaps it gives the ability to identify the parameters of the converter to obtain, as much as possible, a perfect dc signal with less ripple, high power factor and high efficiency. Design is implemented by simulation on Power Simulator PSIM, and practically, a series regulator LM723 is applied to provide regulating output voltage. Comparisons of both simulation and hardware results are made to observe differences and similarities.
Estimation of Sensitivity of the DS/AHP Method While Solving Foresight Problems with Incomplete Data  [PDF]
N. Pankratova, N. Nedashkovskaya
Intelligent Control and Automation (ICA) , 2013, DOI: 10.4236/ica.2013.41011
Abstract:

The paper provides mathematical analysis of sensitivity of different combination rules in the DS/AHP method when an alternative is added to the set of decision alternatives while solving foresight problems. Different cases of rank reversals are defined and two sets of conditions for these cases using the method DS/AHP are considered. Rank reversals are illustrated when the DS/AHP method is used to solve practical problem of critical technologies of energy conservation and power efficiency evaluation in Ukraine. It is shown that the DS/AHP method is not sensitive to exclusion (or addition) of an irrelevant decision alternative from (or to) the set of decision alternatives.

Computation of the Genetic Code: Full Version  [PDF]
N. N. Kozlov
Journal of Computer and Communications (JCC) , 2017, DOI: 10.4236/jcc.2017.510008
Abstract: One of the problems in the development of mathematical theory of the genetic code (summary is presented in [1], the detailed—to [2]) is the problem of the calculation of the genetic code. Similar problem in the world is unknown and could be delivered only in the 21st century. One approach to solving this problem is devoted to this work. For the first time a detailed description of the method of calculation of the genetic code was provided, the idea of which was first published earlier [3]), and the choice of one of the most important sets for the calculation was based on an article [4]. Such a set of amino acid corresponds to a complete set of representation of the plurality of overlapping triple gene belonging to the same DNA strand. A separate issue was the initial point, triggering an iterative search process all codes submitted by the initial data. Mathematical analysis has shown that the said set contains some ambiguities, which have been founded because of our proposed compressed representation of the set. As a result, the developed method of calculation was reduced to two main stages of research, where at the first stage only single-valued domains were used in the calculations. The proposed approach made it possible to significantly reduce the amount of computation at each step in this complex discrete structure.
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