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Search Results: 1 - 10 of 6519 matches for " ALEX HARTANA "
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Phylogenetic Study of Mangifera laurina and its Related Species Using cpDNA trnL-F Spacer Markers
HAYATI Journal of Biosciences , 2010,
Abstract: Phylogenetic study of cpDNA intergenic spacer trnL-F of Mangifera laurina and their related species within the genus Mangifera in Indonesia was conducted using Rutaceae as the outgroup. This study was to reconstruct phylogenetic relationships and to understand infraspecific relationships within Mangifera based on cpDNA trnL-F intergenic spacer sequences. The results showed that Mangifera sp. Hiku (mangga hiku) as the basic cultivar in the clade, and it supported the monophyletic group in Mangifera. And phylogenetic construction indicated that Mangifera sp. Hiku was the progenitor of M. laurina and their related species.
Correlations Between Degree of Petal Fusion, Leaf Size and Fruit Size: A Case in Syzygium (Myrtaceae)
Biodiversitas , 2009,
Abstract: Syzygium is one of large genera of the flowering plants. In order to simplify the identification, a classification is required, e.g. based on degree of petal fusion, leaf size and fruit size. Due to variations of vegetative and generative characters, a correlation analysis was carried out. The aim of this research is to know the correlation between degree of petal fusion, leaf length and fruit diameter. The result of this research showed that there is positive correlation between those three variables. The increase of leaf size will increase fruit size and petal lobe depth.
The Growth of Body Size and Somatotype of Javanese Children Age 4 to 20 Years
HAYATI Journal of Biosciences , 2011,
Abstract: Growth of body size (body height and body weight) and somatotype in 363 girls and 299 boys aged 4 to 20 years of ethnic Javanese lived in Magelang Regency Indonesia were studied cross-sectionally. Over half of them were categorized in the well-off family, therefore underweight or underfat prevalence in our subjects was low (14.3%) but overweight and obesity prevalence was also low (14%). They were shorter and lighter than reference children from U.S., Japan and Yogyakarta but they improved when compared with those of the same ethnic of Bantul and with the different ethnic of rural India. There was a clear age-related change of their somatotype. At age 4 years, the physique of children subjects in both sexes is found to be mesomorph-endomorph. Thereafter it is transformed into ectomorphic-endomorph in girls and to mesomorph-ectomorph in boys at the age of 20 years. In girl subjects, the onset of puberty was characterized by an acceleration of endomorphy component at age 8 years. While in our boys it was characterized by an acceleration of ectomorphy since age 9 years. The different growth pattern of somatotype components showed that the use of BMI as an indicator of fatness in children should be reassessed.
Isolation of cDNA Fragment of Gene Encoding for Actin from Melastoma malabthricum.
Saleha Hannum,Kinya Akashi,Utut Widyastuti Suharsono,Alex Hartana
Makara Seri Sains , 2010,
Abstract: Isolation of cDNA Fragment of Gene Encoding for Actin from Melastoma malabthricum. M. malabathricumgrows well in acidic soil with high Al solubility, thereby it can be used as a model plant for tolerance to aluminum andacid stresses. Actin is housekeeping gene used as an internal control for gene expression analysis. The objective of thisresearch was to isolate and clone the cDNA fragments of MmACT encoding for actin of M. malabathricum. Total RNAwas isolated and used as the template for cDNA synthesis by reverse transcription. Four cDNA fragments of MmACT,called MmACT1, MmACT2, MmACT3, and MmACT4, had been isolated and inserted into pGEM-T Easy plasmid.Nucleotide sequence analysis showed that the size of MmACT1 and MmACT2 is 617 bp, whereas MmACT3 andMmACT4 is 735 bp. The similarity among these four MmACT is about 78%-99% based on nucleotide sequence andabout 98%-100% based on amino acid sequence. Phylogenetic analysis based on amino acid sequence showed that at1% dissimilarity, the MmACT1, MmACT2, MmACT3 and the ACT5 Populus trichocarpha are clustered in one group,while the MmACT4 is grouped with ACT9 P. trichocarpa and ACT1 Gossypium hirsutum, and these two groups areseparated from actin group of monocotyledonous plants. The sequence of MmACT fragments were registered inGenBank/EMBL/DDBJ database with accession numbers AB500686, AB500687, AB500688, and AB500689.
Diversity of SCAR Markers of Pyricularia grisea Isolated from Digitaria ciliaris Following Cross Infection to Rice
Microbiology Indonesia , 2011, DOI: 10.5454/mi.5.1.1
Abstract: Cross infection of Pyricularia grisea from grass to rice and vice versa has been reported, but genetic changes are not known yet. This research aimed at estimating the possibility of the genotype alteration in P. grisea dc4 isolated from Digitaria ciliaris, following cross infection to either rice cv. Kencana bali, Cisokan, and IR64 or Panicum repens, Cynodon dactylon, Digitaria sp., and Ottochloa nodosa. The genotypes were analyzed by employing three SCAR markers, Cut1; PWL2; and Erg2. The results indicated that the dc4 was only able to infect Kencana bali, Cisokan, and P. repens. The dc4 had only two out of three SCAR markers, Cut1 and Erg2. Host shift was followed by genotype alteration in two loci of SCAR. Isolates derived from lesions on Kencana bali (dc4-kb) and Cisokan (dc4-c) of the dc4 infection, both lost their Cut1 and gained PWL2. On the contrary, there was no genotype alteration from dc4 to isolate derived from P. repens of dc4 infection (dc4-pr. Neither the isolate dc4-kb that was cross-inoculated to Cisokan nor the dc4-c that was cross-inoculated to Kencana bali showed SCAR marker change. In comparison, race 173 isolate and those derived from Kencana bali and Cisokan did not show genotype alteration. All had two out of three SCAR markers, PWL2 and Erg2. The isolate 173 was adapted to rice. This indicated that genotype diversity of the dc4 might arise following host shift from grass to rice.
Association of Sexual Maturation and Body Size of Arfak Children
HAYATI Journal of Biosciences , 2012,
Abstract: Gonad maturation in pubertal girls and boys is accompanied with somatic growth spurt, changes in quantity and distribution of body fat (BF), development of secondary sex characters, and relevant physiological events. Menarche (first event of menstruation) and spermarche (first event of nocturnal sperm emission) are usually used as indicators of gonad maturation. We found that median age at menarche of Arfak girls in Manokwari, West Papua is 12.2 years, while median age at spermarche of boys is 13.6 years. A possible factor causing young age at menarche is due to adaptation to unstable environmental conditions because of high risk of mortality by malaria disease during childhood. The events of menarche and spermarche achieved one year after the peak body height (BH) velocity, and just before or at the same time with the time of maximum growth rate of body weight (BW), body mass index (BMI), and BF. The average BMI of Arfak girls was big at 21.9 kg/m2 at the time of their menarche. Bigger average BMI might be caused by prepubertal slowing down of BH growth compare to growth of BW whichis still increasing. Girls accumulate BF before puberty to be used as an energy reserve for the occurrence of menarche. At the time of development of secondary sexual characters girls use the fat reserve so it decline sharply after puberty. In boys, growth rate of BF was stopped at 11 years old, and then growing negatively presumably because boys use fat mass for the occurence of spemarche. BF growth rate reached the lowest point at the age 16 years old, and then increase linearly with age through adolescence until adulthood at age 23 years old.
The Presence of Tobacco Mosaic Virus in the Compost Extract of Cigar Tobacco Debris
HAYATI Journal of Biosciences , 2008,
Abstract: Tobacco mosaic virus (TMV) is resistance to high temperature and able to survive over 10 years on dried leaves, and plant debris is considered as source of inoculums of TMV in the field. In order to inactivate TMV, TMV-infected cigar tobacco debris was composted at starting temperature of 50 oC for two to three days; however, TMV was still infective in the extract compost. If a half leaf cigar tobacco 'H877' was inoculated with compost extract, the symptoms appeared as a necrotic local lesion (NLL) and did not develop systemic lesions. The dilution end point of TMV in extract compost was 10-3. The number of lesion was higher in the glasshouse with average daylight temperature of 32 oC than in the field with average daylight temperature of 29-30 oC. The number NLL was lower and NLL size seemed to be smaller on the first and second inoculated leaves with extract than that of on the first and second inoculated leaves with TMV inoculums. There was a delay of time about 58-106 hours after inoculation of NLL from extract compost inoculums to appear than those of from TMV inoculums. These could be happened because of mineral nutrients of compost and also the temperature of maintaining tobacco plant which inhibited the infections, and of a thermal composting process which destroyed some TMV particles, particularly degraded it’s coat protein.
Qualititative Analysis of Interface Behavior under First Phase Transition  [PDF]
Alex Guskov
Journal of Crystallization Process and Technology (JCPT) , 2012, DOI: 10.4236/jcpt.2012.21005
Abstract: At present there is no explanation of the nature of interface instability upon first order phase transitions. The well-known theory of concentration overcooling under directed crystallization of solutions and Mullins-Sekerka instability cannot account for the diversified liquid component redistribution during solid state transition. In [1-3], within the framework of the nonequilibrium mass transfer problem, it has been shown that there are regimes of the interface instability, which differ from the known ones [4-6]. Moreover, the instability theory of works [1-3] demonstrates a complete experimental agreement of the dependence of eutectic pattern period on interface velocity. However, it is difficult to explain interface instability within the framework of a general setting of the mass-transfer problem. This paper is de-voted to qualitative analysis of the phenomena that are responsible for interface instability. The phenomena are connected by a single equation. Qualitative analysis revealed a variety of different conditions responsible for instability of flat interface stationary movement upon phase transition. The type of instability depends on system parameters. It is important that interface instability in the asymptotic case of quasi-equilibrium problem setting is qualitatively different from interface instability in the case of nonequilibrium problem setting.
Social Media and Political Participation: An Investigation of Small Scale Activism in Greece  [PDF]
Alex Afouxenidis
Advances in Applied Sociology (AASoci) , 2014, DOI: 10.4236/aasoci.2014.41001

This paper discusses the possibilities and limitations of online activism. The example used to illustrate the above point provides some evidence that, on some occasions, civil society maybe mobilized through the use of the internet and the online public sphere, to organize more coherent and practical political demands. At the same time, it is also shown that the capacity of individuals to fully participate depends on previous offline experiences as well as a relatively higher degree of technical competence.

On Linear Analysis of the Movement of the Interface under Directed Crystallization  [PDF]
Alex Guskov
Advances in Chemical Engineering and Science (ACES) , 2014, DOI: 10.4236/aces.2014.42014

We present a detailed discussion of the boundary conditions of the directed crystallization problem, a formulation of the model considering temperature fields of external sources, the mechanism of attachment of particles to the growing solid surface, the influence of interphase component absorption on the phase distribution ratio of the components as well as the calculation of the period of the morphological interface instability which is made with due regard of all the aforementioned conditions.

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