scholarly journals FIRST KARYOTYPE REPORT ON Colocasia oresbia: A COMPARATIVE CYTOGENETIC STUDY BETWEEN TWO VARIETIES

2020 ◽  
Vol 31 (Issue 2) ◽  
pp. 7-11
Author(s):  
N. Begum Kazi ◽  
K. Dash Chandan ◽  
S. Sultana Syeda
Keyword(s):  
Cytogenetic Study ◽  
Chromosome Length ◽  
Future Research ◽  
Somatic Chromosome Number ◽  
Chromomycin A3 ◽  
Banding Patterns ◽  
Ecological Zones ◽  
Karyotypic Formula ◽  
Dapi Banding

Karyotypes of two Colocasia oresbia botanical varieties from Bangladesh were analyzed and compared with orcein, chromomycin A3 (CMA) and 4´-6 diamidino-2-phenylindole (DAPI). Both varieties had 2n=2x=26 chromosomes (karyotypic formula: 20m+6sm) and a pair of satellites each. Total chromosome length was 144.18±2.45 μm in C. oresbia var. oresbia and 133.02±2.75 μm in C. oresbia var. stolonifera. The karyotype of Colocasia oresbia var. oresbia is 2A whereas that of C. oresbia var. stolonifera is 1A. Six CMA and four DAPI bands were observed in C. oresbia var. oresbia and eight CMA and six DAPI bands in C. oresbia var. stolonifera. However, in these two morphologically distinct C. oresbia varieties of two different ecological zones, the same somatic chromosome number, diversification in various karyotypic parameters and CMA/DAPI-banding patterns were observed. In addition to taxonomic characters, the studied karyotype features will contribute to the characterization of these two C. oresbia varieties and to establish a base for future research. Key words: chromosome banding; CMA; DAPI; Karyotype.

scholarly journals Cytogenetic studies of three cultivated hill cotton (Gossypium arboreum L.) varieties from Bangladesh

2021 ◽  
Vol 81 (01) ◽  
pp. 135-138
Author(s):  
Afsana Hossain ◽  
Chandan Kumar Dash ◽  
Syeda Sharmeen Sultana
Keyword(s):  
Somatic Chromosome ◽  
Repetitive Sequences ◽  
Differential Staining ◽  
Gossypium Arboreum ◽  
Somatic Chromosome Number ◽  
Chromomycin A3 ◽  
Banding Patterns ◽  
Cytogenetic Studies ◽  
Karyotypic Diversity ◽  
Dapi Banding

Three hill cotton (Gossypium arboreum L.) varieties viz., HC-1, HC-2 and HC-3, released by Bangladesh Cotton Development Board were investigated through orcein, CMAand DAPI-banding for cytogenetical characterization and to elucidate the karyotypic diversity among these varieties. All these three varieties were found to possess 2n = 26 metacentric chromosomes with ‘1A’ karyotype. Based on TF%, AsK% and Syi index, HC-3 was little advanced over HC-1 and HC-2. These three varieties showed differential Chromomycin A3 (CMA)- and 4Ê-6 Diamidino-2-Phenyl Indole (DAPI)-banding patterns and a tendency of acumulation of repetitive sequences at the terminal regions was observed. Despite possessing same somatic chromosome number these three hill cotton varieties could be characterized by diversified karyotypic parameters through differential staining.

Cytogenetical analysis of Clitoria ternatea

2021 ◽  
Vol 8 (1) ◽  
pp. 71-77
Author(s):  
P. Phukan ◽  
M. A. Laskar ◽  
B. J. Mylliemngap ◽  
J. M. Lamo
Keyword(s):  
Somatic Chromosome ◽  
Heterochromatic Region ◽  
Somatic Chromosome Number ◽  
Chromomycin A3 ◽  
Important Species ◽  
Clitoria Ternatea ◽  
Nucleolar Organizing Region ◽  
The Family ◽  
Cytogenetical Analysis

Clitoria ternatea L. of the family Fabaceae is an economical, ornamental as well as medicinal important species. Chromosome characterization of C. ternatea, encompassing karyomorphological as well as fluorochrome binding was carried out in the present investigation. Karyomorphological studies showed the presence of 2n = 16 somatic chromosome number with three pairs of metacentric chromosomes and five pairs of submedian chromosomes. The analysis also revealed the present of one pair of nucleolar organizing region or satellite. Fluorochrome binding using chromomycin A3 (CMA) and 4-6-diamidino-2-phenylindole (DAPI) showed the presence of GC- and AT- rich heterochromatic region. Further analysis revealed the percentage of GC-rich was comparatively higher than AT-rich heterochromatic region. This is the first report on heterochromatin characterization in C. ternatea.

Parasite defense mechanisms in bees: behavior, immunity, antimicrobials, and symbionts

2019 ◽  
Vol 4 (1) ◽  
pp. 59-76 ◽  
Author(s):  
Alison E. Fowler ◽  
Rebecca E. Irwin ◽  
Lynn S. Adler
Keyword(s):  
Defense Mechanisms ◽  
Poor Quality ◽  
Future Research ◽  
Immune Priming ◽  
Social Bees ◽  
Bee Health ◽  
Landscape Scales ◽  
And Function ◽  
Solitary Species

Parasites are linked to the decline of some bee populations; thus, understanding defense mechanisms has important implications for bee health. Recent advances have improved our understanding of factors mediating bee health ranging from molecular to landscape scales, but often as disparate literatures. Here, we bring together these fields and summarize our current understanding of bee defense mechanisms including immunity, immunization, and transgenerational immune priming in social and solitary species. Additionally, the characterization of microbial diversity and function in some bee taxa has shed light on the importance of microbes for bee health, but we lack information that links microbial communities to parasite infection in most bee species. Studies are beginning to identify how bee defense mechanisms are affected by stressors such as poor-quality diets and pesticides, but further research on this topic is needed. We discuss how integrating research on host traits, microbial partners, and nutrition, as well as improving our knowledge base on wild and semi-social bees, will help inform future research, conservation efforts, and management.

scholarly journals Crowdsourcing and open innovation: a systematic literature review, an integrated framework and a research agenda

2021 ◽  
Author(s):  
Livio Cricelli ◽  
Michele Grimaldi ◽  
Silvia Vermicelli
Keyword(s):  
Literature Review ◽  
Systematic Literature Review ◽  
Open Innovation ◽  
Innovation Management ◽  
Academic Research ◽  
Future Research ◽  
Four Dimensions ◽  
Word Analysis ◽  
The Relationship

AbstractIn recent years, Open Innovation (OI) and crowdsourcing have been very popular topics in the innovation management literature, attracting significant interest and attention, and inspiring a rich production of publications. Although these two topics share common themes and address similar managerial challenges, to the best of our knowledge, there is no systematic literature review that digs deep into the intersection of both fields. To fill in this gap a joint review of crowdsourcing and OI topics is both timely and of interest. Therefore, the main objective of this study is to carry out a comprehensive, systematic, and objective review of academic research to help shed light on the relationship between OI and crowdsourcing. For this purpose, we reviewed the literature published on these two topics between 2008 and 2019, applying two bibliometric techniques, co-citation and co-word analysis. We obtained the following results: (i) we provide a qualitative analysis of the emerging and trending themes, (ii) we discuss a characterization of the intersection between OI and crowdsourcing, identifying four dimensions (strategic, managerial, behavioral, and technological), (iii) we present a schematic reconceptualization of the thematic clusters, proposing an integrated view. We conclude by suggesting promising opportunities for future research.

scholarly journals Diversity of Cowpea [Vigna unguiculata (L.) Walp] Landraces in Mozambique: New Opportunities for Crop Improvement and Future Breeding Programs

Agronomy ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 991
Author(s):  
Ana Maria Figueira Gomes ◽  
David Draper ◽  
Nascimento Nhantumbo ◽  
Rafael Massinga ◽  
José C. Ramalho ◽  
...  
Keyword(s):  
Vigna Unguiculata ◽  
Production Systems ◽  
Crop Improvement ◽  
Morphological Diversity ◽  
Ecological Zones ◽  
Nutrition Security ◽  
Food And Nutrition ◽  
High Level ◽  
Nutrition Sensitive

Cowpea (Vigna unguiculata) is a neglected crop native to Africa, with an outstanding potential to contribute to the major challenges in food and nutrition security, as well as in agricultural sustainability. Two major issues regarding cowpea research have been highlighted in recent years—the establishment of core collections and the characterization of landraces—as crucial to the implementation of environmentally resilient and nutrition-sensitive production systems. In this work, we have collected, mapped, and characterized the morphological attributes of 61 cowpea genotypes, from 10 landraces spanning across six agro-ecological zones and three provinces in Mozambique. Our results reveal that local landraces retain a high level of morphological diversity without a specific geographical pattern, suggesting the existence of gene flow. Nevertheless, accessions from one landrace, i.e., Maringué, seem to be the most promising in terms of yield and nutrition-related parameters, and could therefore be integrated into the ongoing conservation and breeding efforts in the region towards the production of elite varieties of cowpea.

Ferrous materials degradation: characterisation of rust by colour – an overview

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Desmond E. P. Klenam ◽  
Michael O. Bodunrin ◽  
Stefania Akromah ◽  
Emmanuel Gikunoo ◽  
Anthony Andrews ◽  
...  
Keyword(s):  
Yellow Rust ◽  
Brown Rust ◽  
Future Research ◽  
Stable Form ◽  
Low Oxygen ◽  
High Moisture ◽  
Oxygen Environment ◽  
Causative Factors ◽  
Analytical Tools

Abstract An overview of the characterisation of rust by colour is presented. Each distinct rust colour is caused by atmospheric impurities, high or low moisture content and high or low oxygen environment over time. Yellow rust is mainly due to the high moisture environment over a period of time, which drips. Brown rust is dry, crusty and due to water and oxygen contact with localised patches on component surfaces. Black rust, the most stable form, occurs in low moisture and low oxygen environment. The rust residue shows where the reaction started, especially in contact with chlorides. The causative factors of red rust are atmospheric and similar to black rust in a chloride-containing environment. The effect of packaging, manufacturing and environmental factors on rust colour is briefly discussed. Visual characterization of rust could pre-empt root causes and analytical tools for validation. The limitations of these concepts are mentioned and directions for future research highlighted.

Production of Bio Gas from Vegetable and Flowers Wastes Using Anaerobic Digestion

2015 ◽  
Vol 787 ◽  
pp. 803-808 ◽  
Author(s):  
A. Deepanraj ◽  
S. Vijayalakshmi ◽  
J. Ranjitha
Keyword(s):  
Anaerobic Digestion ◽  
Biogas Production ◽  
Research Work ◽  
Pressure Gauge ◽  
Pig Manure ◽  
Future Research ◽  
Digital Pressure ◽  
Vegetable Wastes ◽  
Main Component

The present research paper describes about the anaerobic digestion of vegetable (Banana, Cauliflower, potato, and sweet potato) and flower wastes (Rose, sambangi, gulmohar, marigold, golden shower tree, silk tree mimosa) in a 1L capacity of anaerobic digestor using pig manure as an inoculums. The digester was operated in the ratio of 1:1 of substrate to inoculums at RT. The substrate concentrations are varied such as 5%, 7%, and 10% was used and amount of gas produced was analysed using digital pressure gauge. The results obtained showed that, marigold flower had given higher yield of biogas than vegetable wastes and the digestion period was less. The average biogas production potential of withered flowers was observed as 14.36 g/kg in 5 days, where in case of vegetable wastes it was 10.0234 g/kg in 6 days. The study showed that flowers which are available in abundant in India is thrown away within a day, in the environment. These feedstocks are good feed stock for the production of biogas. The generation of biogas from flowers and vegetable waste upholds the concept of waste to wealth in enhancing sustainability of development. The future research work is mainly focused on the characterization of the main component present in the bio-gas using sophisticated instruments.

scholarly journals High-growth firms and scale-ups: a review and research agenda

2019 ◽  
Vol 54 (1) ◽  
pp. 96-111
Author(s):  
Guilherme Fowler A. Monteiro
Keyword(s):  
Research Agenda ◽  
Design Methodology ◽  
Scale Up ◽  
High Growth ◽  
Levels Of Analysis ◽  
Future Research ◽  
Content Type ◽  
Growth Firms ◽  
Different Levels

Purpose This paper aims to conduct an extensive review and advances a framework for the literature of high-growth firms (HGFs) and scale-ups. Design/methodology/approach This paper takes the form of a literature review. Findings The author makes three specific contributions. First, he presents a broad review of high growth in firms, shedding light on the different levels of analysis. Second, he advances a characterization of scale-up companies to enable a better basis for discussion. Finally, he identifies gaps in the existing literature and suggest paths for future research. Originality/value The interest in HGFs and those referred to as scale-ups has increased considerably in recent years. Despite this trend, existing studies still have conceptual divergences and a gap separating theoretical inputs from the actual experiences of entrepreneurs.

scholarly journals Smartphones and Learning: An Extension of M-Learning or a Distinct Area of Inquiry

2022 ◽  
Vol 12 (1) ◽  
pp. 50
Author(s):  
Kendall Hartley ◽  
Alberto Andújar
Keyword(s):  
Future Research ◽  
Unique Role ◽  
Distinct Area ◽  
Unique Nature ◽  
Author Keywords ◽  
Learning Research ◽  
Research In Education

The smartphone has become an integral part of the education landscape. While there has been significant smartphone research in education under the guise of m-learning, the unique role of the device suggests that m-learning may not be an appropriate characterization. The purpose of this paper is to review the use of m-learning as a primary descriptor for smartphone- and learning-related research. In support of this goal, the paper reviews the definitions associated with m-learning, smartphones, and related technologies from the perspective of educational research. In addition, a review of author keywords of research on smartphones in education is used to provide context to the classification of the research. Finally, three theoretically guided smartphone programs are presented as evidence of the unique nature of smartphone and learning research. This review concludes with recommendations for the characterization of future research.

Sign in / Sign up

Export Citation Format

Share Document