scholarly journals Study Site Number

2020 ◽  
Author(s):  
Keyword(s):  
Site Number

Species composition and distribution of marine macro algae at Co To and Thanh Lan archipelago

2020 ◽  
Vol 20 (3) ◽  
pp. 267-276
Author(s):  
Dam Duc Tien ◽  
Nguyen Thi Mai Anh ◽  
Linh Manh Nguyen ◽  
Pham Thu Hue ◽  
Lawrence Liao
Keyword(s):  
Species Composition ◽  
Littoral Zone ◽  
Marine Algae ◽  
Similarity Coefficient ◽  
Algal Flora ◽  
Average Value ◽  
Site Number ◽  
Species Composition And Distribution ◽  
Total Species ◽  
Macro Algae

This paper exhibites species composition and distribution of marine seaweed at 10 sites of Co To and Thanh Lan islands in May 2019. The studies record 76 species of marine algae in the area, belonging to four divisions: Cyanophytes, Rhodophytes, Ochrophytes and Chlorophytes. Among them, five species are classified into Cyanophytes (comprising 6.6% of total species); thirty-four species into Rhodophytes (44.7%); twenty-one species into Ochrophytes/Phaeophytes (27.6%) and sixteen species into Chlorophytes (21.1%). The species composition of marine seaweeds in Co To and Thanh Lan shows significant differences as follows: 22 species (sites number 4 and 10) to 58 species (site number 2) and the average value is 38.7 species per site. Sørensen similarity coefficient fluctuates from 0.33 (sites number 5 and 10) to 0.84 (sites number 1 and 3) and the average value is 0.53. The current investigations show that four species of twenty-one species are collected in the littoral zone and forty-two species in the sub-littoral zone (in which there are thirteen species distributed in both littoral zone and sub-littoral zone). The algal flora in Co To and Thanh Lan is characterized by subtropics.

scholarly journals Chromosomal Distribution of Transposable Elements in Drosophila melanogaster Test of the Ectopic Recombination Model for Maintenance of Insertion Site Number

Genetics ◽  
1996 ◽  
Vol 144 (1) ◽  
pp. 197-204
Author(s):  
Christine Hoogland ◽  
Christian Biémont
Keyword(s):  
Drosophila Melanogaster ◽  
Transposable Elements ◽  
Dna Content ◽  
Recombination Rate ◽  
Alternative Hypothesis ◽  
Insertion Site ◽  
Polytene Chromosomes ◽  
Negative Relationship ◽  
Site Occupancy ◽  
Site Number

Abstract Data of insertion site localization and site occupancy frequency of P, hobo, I, copia, mdg1, mdg3, 412, 297, and roo transposable elements (TEs) on the polytene chromosomes of Drosophila melanogaster were extracted from the literature. We show that TE insertion site number per chromosomal division was significantly correlated with the amount of DNA. The insertion site number weighted by DNA content was not correlated with recombination rate for all TEs except hobo, for which a positive correlation was detected. No global tendency emerged in the relationship between TE site occupancy frequency, weighted by DNA content, and recombination rate; a strong negative correlation was, however, found for the 3L arm. A possible dominant deleterious effect of chromosomal rearrangements due to recombination between TE insertions is thus not the main factor explaining the dynamics of TEs, since this hypothesis implies a negative relationship between recombination rate and both TE insertion site number and site occupancy frequency. The alternative hypothesis of selection against deleterious effects of insertional mutations is discussed.

scholarly journals Condensation of Indole with Isatin over AlCl3/Mesoporous Aluminosilicate

2015 ◽  
Vol 15 (1) ◽  
pp. 56-63
Author(s):  
Tri Esti Purbaningtias ◽  
Didik Prasetyoko ◽  
Hasliza Bahruji ◽  
Yusuf Muhammad Zein ◽  
Sugeng Triwahyono ◽  
...  
Keyword(s):  
Surface Area ◽  
Lewis Acid ◽  
Acid Site ◽  
Aluminium Chloride ◽  
Total Acidity ◽  
Bronsted Acid ◽  
Site Number ◽  
Brönsted Acid ◽  
Maximum Conversion ◽  
Mesoporous Aluminosilicate

Aluminium chloride immobilized on mesoporous aluminosilicate was investigated as catalysts in the condensation of isatin with indole. AlCl3/mesoporous aluminosilicate (AlCl3/AM) catalysts were prepared by impregnation of 1, 5, 10 and 15 wt% AlCl3 on the surface of mesoporous aluminosilicate. A maximum conversion of isatin was achieved using 15% AlCl3/AM catalyst whereas the highest selectivity of 68.97% towards trisindoline was obtained using pure AM. The activity of the catalysts was depended on their acid site number and surface area. The number of Brønsted acid and the surface area affected to the conversion of isatin while the total acidity and the number of Lewis acid influenced the selectivity.

scholarly journals Jelentés a Kaposvárt elkerülő 61-es számú főút 2. lelőhelyén végzett feltárásról

2014 ◽  
pp. 175-184
Author(s):  
Edith Bárdos ◽  
Máté Varga
Keyword(s):  
Medieval Period ◽  
The South ◽  
Late Neolithic ◽  
Late Medieval ◽  
The North ◽  
Late Medieval Period ◽  
Site Number ◽  
Extended Area

The preliminary explorations of the bypass of road 61 to the North of Kaposvár took more years. Among the ex-cavations in the pathes of the new highway, one of the great-est and most important is the excavation of site number 2 to the South of Toponár. The excavation is located on the East-ern bank of Stream Deseda. The territory was almost always suitable for settlement. It is proved by the fact that we found artifacts from 9 period-cultures from the late Neolithic to the late Medieval period. On the site of the excavations there is an outstanding amount of scattered cremation burials and urn graves from the period of the Transdanubian Encrusted Pot-tery Culture, as well as the cemetery established in the 11th century, in the Arpadian-age. The extended area of the exca-vations was settled intensively in the late Avar-age and in the early Arpadian-age.

Alterations in Spleen Norepinephrine and Lymphocyte [3H] Dihydroalprenolol Binding Site Number in Genetically Epilepsy-Prone Rats

1993 ◽  
Vol 7 (2) ◽  
pp. 113-120 ◽  
Author(s):  
J.A. Carr ◽  
K.A. Ortiz ◽  
L.L. Paxton ◽  
L.C. Saland ◽  
D.D. Savage
Keyword(s):  
Binding Site ◽  
Site Number

Comparative chromosomal localization of 45S and 5S rDNAs and implications for genome evolution in Cucumis

Genome ◽  
2016 ◽  
Vol 59 (7) ◽  
pp. 449-457 ◽  
Author(s):  
Zhen-Tao Zhang ◽  
Shu-Qiong Yang ◽  
Zi-Ang Li ◽  
Yun-Xia Zhang ◽  
Yun-Zhu Wang ◽  
...  
Keyword(s):  
Chromosomal Localization ◽  
5S Rdna ◽  
Chromosome Analysis ◽  
45S Rdna ◽  
Evolutionary Patterns ◽  
Site Number ◽  
Rdna Sites ◽  
Wild Accessions ◽  
Ribosomal Dnas

Ribosomal DNAs are useful cytogenetic markers for chromosome analysis. Studies investigating site numbers and distributions of rDNAs have provided important information for elucidating genome organization and chromosomal relationships of many species by fluorescence in situ hybridization. But relevant studies are scarce for species of the genus Cucumis, especially in wild species. In the present study, FISH was conducted to investigate the organization of 45S and 5S rDNA among 20 Cucumis accessions, including cultivars and wild accessions. Our results showed that the number of 45S rDNA sites varied from one to five pairs in different accessions, and most of these sites are located at the terminal regions of chromosomes. Interestingly, up to five pairs of 45S rDNA sites were observed in C. sativus var. sativus, the species which has the lowest chromosome number, i.e., 2n = 14. Only one pair of 5S rDNA sites was detected in all accessions, except for C. heptadactylus, C. sp, and C. spp that had two pairs of 5S rDNA sites. The distributions of 5S rDNA sites showed more variation than 45S rDNA sites. The phylogenetic analysis in this study showed that 45S and 5S rDNA have contrasting evolutionary patterns. We find that 5S rDNA has a polyploidization-related tendency towards the terminal location from an interstitial location but maintains a conserved site number, whereas the 45S rDNA showed a trend of increasing site number but a relatively conserved location.

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