scholarly journals A Current Update on the Distribution, Morphological Features, and Genetic Identity of the Southeast Asian Mahseers, Tor Species

Biology ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 286
Author(s):  
Faizul Jaafar ◽  
Uthairat Na-Nakorn ◽  
Prapansak Srisapoome ◽  
Thumronk Amornsakun ◽  
Thuy-Yen Duong ◽  
...  
Keyword(s):  
Genetic Markers ◽  
Morphological Features ◽  
Genetic Identification ◽  
Taxonomic Identification ◽  
Median Lobe ◽  
New Directions ◽  
Tor Putitora ◽  
Species Taxonomy ◽  
A Current ◽  
Tor Tor

The king of rivers or mahseer comprises three genera: Tor, Neolissochilus, and Naziritor, under the Cyprinidae family. The Tor genus has been classified as the true mahseer due to the presence of a median lobe among the three genera. The Tor species are widely distributed across Southeast (SE) Asia, and 13 Tor species have been reported previously: Tor ater, Tor dongnaiensis, Tor douronensis, Tor laterivittatus, Tor mosal, Tor mekongensis, Tor putitora, Tor sinensis, Tor soro, Tor tambra, Tor tambroides, Tor tor and Tor yingjiangensis. However, the exact number of valid Tor species remains debatable. Different and unstandardized approaches of applying genetic markers in taxonomic identification and morphology variation within the same species have further widened the gap and ameliorated the instability of Tor species taxonomy. Therefore, synchronized and strategized research among Tor species researchers is urgently required to improve and fill the knowledge gap. This review is a current update of SE Asia’s Tor species, outlining their distribution, morphology, and genetic identification. In addition, the present review proposes that there are ten valid Tor species in the SE Asian region. This list will serve as a template and standard to improve the taxonomy of the SE Asian Tor species, which could serve as a basis to open new directions in Tor research.

scholarly journals PHENOTYPES AND ENDOTYPES OF BRONCHIAL ASTHMA: FROM PATHOGENESIS AND CLINICAL FEATURES TO THERAPY

2013 ◽  
Vol 10 (1) ◽  
pp. 15-24
Author(s):  
O M Kurbacheva ◽  
K S Pavlova
Keyword(s):  
Genetic Markers ◽  
Clinical Features ◽  
Bronchial Asthma ◽  
Standard Treatment ◽  
Clinical Signs ◽  
Individual Approach ◽  
A Current

Questions of bronchial asthma heterogeneity, approaches to allocation of various phenotypes on the basis of clinical signs, biological and genetic markers and endotypes taking into account an etiology and pathophysiology of the disease are considered in the article. Allocation of phenotypes / endotypes promote the best understanding of essence of a disease and it is expedient for development of an individual approach to therapy as some options of a current OH can differ the resistant answer to standard treatment.

Genetic identification of tissue of origin of cellular populations within the mouse placenta

Development ◽  
1985 ◽  
Vol 86 (1) ◽  
pp. 177-189
Author(s):  
J. Rossant ◽  
B. A. Croy
Keyword(s):  
Genetic Markers ◽  
Inner Cell Mass ◽  
Cell Mass ◽  
Complex Mixture ◽  
Placental Tissue ◽  
Genetic Identification ◽  
Blood Capillaries ◽  
Maternal Contribution ◽  
Foetal Blood

The mouse haemochorial placenta is a complex mixture of maternal cells and foetal trophectoderm and inner cell mass (ICM)-derived cells. The majority of the placental tissue is assumed to be trophoblast in origin but the exact extent and localization of the ICM and maternal contribution has not previously been determined. Using embryo transfer and reconstituted blastocyst techniques, combined with isozymal and in situ genetic markers, we have established that about 70% of the 13 to 15-day placenta is trophectoderm-derived, 30% is maternal in origin, and 4% develops from the ICM. Nearly all of the maternal contribution was confined to the spongiotrophoblast region and all of the ICM contribution was confined to the labyrinthine trophoblast region, where it formed the foetal blood capillaries and the endodermal sinuses. Using the same genetic markers, we showed that cell suspension techniques commonly used to produce ‘trophoblast’ cell preparations from placenta do not enrich for trophoblast, and, indeed, that collagenase, the preferred dissociation technique for cell viability, produced cell suspensions in which ICM and maternal cells were preferentially dissociated. No method for producing pure trophoblast populations has yet been found. Some unusually high ICM contributions to the placenta were found in reconstituted blastocyst experiments using ICMs isolated from early 3·5-day blastocysts, suggesting that these ICMs may have contributed to the trophectoderm layer of the blastocyst. These and other experiments suggest that the inner cell mass lineage may not be closed until some time after formation of the blastocyst.

New records of elasmobranchs in the Bay of Bengal, Bangladesh: further taxonomic research is essential

Zootaxa ◽  
2021 ◽  
Vol 5027 (2) ◽  
pp. 211-230
Author(s):  
ALIFA BINTHA HAQUE ◽  
WILLIAM T. WHITE ◽  
RACHEL D. CAVANAGH ◽  
APARNA RITI BISWAS ◽  
NAZIA HOSSAIN
Keyword(s):  
Species Diversity ◽  
Bay Of Bengal ◽  
New Records ◽  
Coastal Region ◽  
Genetic Identification ◽  
Taxonomic Identification ◽  
The Family ◽  
Taxonomic Research ◽  
Identification Techniques

To evaluate the species diversity and strengthen the taxonomic identification of elasmobranchs in the Bay of Bengal, Bangladesh, a study was conducted in the southeast coastal region between January 2016 and March 2018. Using morphological and genetic identification techniques, this study presents 22 species from the region. Thirteen of these are new records. The new records consist of eight species from the family Dasyatidae, and one each from Mobulidae, Rhinobatidae, Narcinidae, Hemiscylliidae and Triakidae. Furthermore, four occurrences are first verified reports, and five are potential new records requiring further taxonomic investigation.  

scholarly journals Nesaeoduvalius (gen. n.) vailatii sp. n., from Euboia island (Eastern Greece) (Coleoptera: Carabidae, Trechinae)

2016 ◽  
Vol 48 (1) ◽  
pp. 1
Author(s):  
Achille Casale ◽  
Pier Mauro Giachino
Keyword(s):  
New Species ◽  
Male Genitalia ◽  
New Genus ◽  
Morphological Features ◽  
New Taxon ◽  
Median Lobe ◽  
General Shape ◽  
Lateral Margins

<em>Nesaeoduvalius</em> (new genus) <em>vailatii</em> Casale &amp; Giachino, new species (Coleoptera: Carabidae: Trechini) is described and illustrated from the Euboia (Evvia) island (eastern Greece). The new taxon belongs to the <em>Duvalius</em> “isotopic” trechine lineage, but is markedly characterized by the peculiar combination of several morphological features in the general shape, chaetotaxy of head, serrate lateral margins of elytra, and features of male genitalia (both in median lobe of aedeagus and endophallus). Its putative position amongst the trechines of the <em>Duvalius</em> phyletic lineage is discussed. Data on the distribution and habitat of this new, insular and unexpected taxon are also provided.

scholarly journals New early Cambrian sclerites ofLapworthella schodakensisfrom NE Greenland: advancements in knowledge of lapworthellid taxonomy, sclerite growth and scleritome organization

2016 ◽  
Vol 154 (5) ◽  
pp. 1061-1072 ◽  
Author(s):  
L. DEVAERE ◽  
C. B. SKOVSTED
Keyword(s):  
Early Ontogeny ◽  
Body Plan ◽  
Morphological Features ◽  
Early Cambrian ◽  
Shell Microstructure ◽  
Laminar Shell ◽  
Small Shelly Fossils ◽  
New Information ◽  
Stage 4 ◽  
Species Taxonomy

AbstractThe Cambrian Stage 4 upper Bastion Formation of Albert Heim Bjerge and CH Ostenfeld Nunatak, NE Greenland, yielded 34 excellently preserved sclerites ofLapworthella schodackensisamong other small shelly fossils. Lapworthellids have been interpreted as members of the camenellans, a basal tommotiid group. Little is known about this group although the morphological and ultrastructural features of their sclerites allow a potential reconstruction of a lophophorate body plan. The exquisite material from Greenland provides significant new data for the revision of the species taxonomy, but also for the comprehension of the scleritome structure of lapworthellids and the mode of formation of their sclerites. Two morphotypes ofL. schodackensissclerites are identified: one with a simple apex, occurring in sinistral and dextral forms; and one bilaterally symmetrical sclerite with two apices. All bear a similar ornamentation constructed of repeated growth sets consisting of a reticulate inter-rib groove with tubercles, a densely denticulate rib and a striated sub-rib area. The new data on the ornamentation and observations of the laminar shell microstructure ofL. schodackensisenable us to improve the reconstruction of growth in lapworthellids. Finally, the morphological features of the two types of sclerites provide new information for the reconstruction of the bilaterally symmetrical multi-component lapworthellid scleritome with evidence of the fusion of adjacent sclerites during early ontogeny.

scholarly journals Mitotic mapping ofSchizosaccharomyces pombe

1970 ◽  
Vol 16 (2) ◽  
pp. 127-144 ◽  
Author(s):  
Miguel Flores da Cunha
Keyword(s):  
Genetic Mapping ◽  
Fission Yeast ◽  
Genetic Markers ◽  
Mechanism Of Action ◽  
Genetic Identification ◽  
Crossing Over ◽  
Cell Divisions ◽  
Progressive Loss ◽  
Diploid Cells ◽  
Linkage Relationships

SUMMARYGenetic mapping by means of mitotic haploidization (induced by parafluoropkenylalanine) and mitotic crossing-over was carried out with the fission yeastSchizosaccharomyces pombe. Thirty-two different genetic markers were involved in this investigation; some meiotic linkage relationships had been previously reported (Leupold, Megnet) for 16 of these loci. Mitotic haploidization experiments resulted in the genetic identification of six chromosomes in the haploid complement.Furthermore, in an attempt to study the mechanism of action of parafluorophenylalanine (pFPA) on mitotic haploidization, pedigree analyses were performed by micromanipulation of diploid cells growing in the presence of pFPA. Haploid cells were detected after 40 hours of contact with the analogue and many lethal pedigree branches were observed. These observations seem to agree with Käfer's (1961) and Lhoa's (1968) suggestion that mitotic haploidization in Fungi is achieved by progressive loss of chromosomes throughout cell divisions.

scholarly journals Genetic identification of the Putre’s oregano (Origanum vulgare L.) by ITS and microsatellites, a species recognized in Chile with Seal of Origin

2021 ◽  
Vol 20 (2) ◽  
pp. 177-194
Author(s):  
Roberto Contreras ◽  
◽  
Isabel Calle ◽  
Romulo Oses ◽  
Fernanda Aguayo ◽  
...  
Keyword(s):  
Molecular Markers ◽  
Genetic Markers ◽  
Dna Barcode ◽  
Genetic Identification ◽  
Geographical Indication ◽  
Origanum Vulgare ◽  
Technological Support ◽  
Different Sources ◽  
Production Conditions ◽  
Organoleptic Attributes

Putre´s oregano (Origanum vulgare L.) is a variety of oregano that grown in the Arica-Parinacota Region. Its organoleptic attributes and unique production conditions have earned it a certification with Geographical Indication (GI). However, the demands of the markets require a scientific-technological support for identification and authentication of materials. In this context, was proposed to identify Putre's oregano by phylogenetic relationships based on the use of molecular markers SSR and "DNA Barcode". The results showed that when comparing materials from different sources of Putre´s oregano versus information from certified germplasms and GenBank sequences, added to the analysis with nuclear genetic markers, Putre´s oregano corresponds to the species Origanum vulgare L. subsp virens. This precise identification will support the correct differentiation and authentication of this genotype, serving in addition to supporting the GI.

A new species Asproparthenis omeri sp. nov. (Coleoptera: Curculionidae: Lixinae) from the Aras valley in Northeastern Turkey

2020 ◽  
Vol 17 (1) ◽  
pp. 12-27
Author(s):  
BORIS A. KOROTYAEV ◽  
NESLİHAN GÜLTEKİN ◽  
LEVENT GÜLTEKİN
Keyword(s):  
New Species ◽  
Key Words ◽  
River Valley ◽  
Morphological Features ◽  
Type Locality ◽  
Digital Photographs ◽  
Species Taxonomy ◽  
Aras River ◽  
A New Species

A new species Asproparthenis omeri sp. nov. closely related to A. vexata (Gyllenhal, 1834) is described in the tribe Cleonini (Curculionidae) from the Aras River valley in Northeastern Turkey. The new species is the first representative of the genus Asproparthenis Gozis, 1886 with vestigial hind wings. Digital photographs of diagnostic morphological features of the new species and A. vexata are provided. Adults of the new species feed on leaves of a halophilic chenopod Bassia hirsuta (L.) Ascherson that dominates vegetation in the saline and desertified habitat in the type locality. Key words: Asproparthenis, new species, taxonomy, bionomics, halophyte, Bassia hirsuta, Turkey

Effect of oral suction and other friction-enhancing behaviors on the station-holding performance of suckermouth catfish (Hypostomus spp.)

2007 ◽  
Vol 85 (1) ◽  
pp. 133-140 ◽  
Author(s):  
C.L. Gerstner
Keyword(s):  
Morphological Features ◽  
Ground Contact ◽  
Pectoral Fin ◽  
Wire Grid ◽  
The Wire ◽  
A Current ◽  
Fin Spines

Effect of oral suction and other friction-enhancing behaviors on the ability to maintain position in a current (station-holding) was determined for the suckermouth catfish (genus Hypostomus Lacépède, 1803). Fish were tested using an increasing velocity test on three substrata (smooth Lucite®, rough Lucite®, and wire grid). On the smooth substratum, use of oral suction and other behaviors delayed the need to swim continuously out of ground contact from 9.1 ± 0.3 cm/s (uslip) to 89.2 ± 7.9 cm/s (uswim). Trials on the wire grid showed that oral suction was ineffective as predicted; however, fish were able to use other friction-enhancing behaviors instead to improve station-holding performance. Behaviors that increased friction by hooking the fish to the substrate via the odontodes and pectoral fin spines were very effective at delaying the need for steady swimming from 12.9 to 145.0 cm/s. On the rough substratum, fish were able to use both oral suction and the odontodes or fin spines to increase friction, and station-holding performance was similar to values on the wire substratum. Thus, while use of the oral suction disk was shown to improve station-holding performance, use of other morphological features such as the odontodes and fin spines may be equally important.

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