scholarly journals The role of a cascade of reservoirs and seasonal variation in the phytoplankton structure in a tropical river

2013 ◽  
Vol 73 (2) ◽  
pp. 291-298 ◽  
Author(s):  
AN Moura ◽  
JS Severiano ◽  
NKA Tavares ◽  
EW Dantas
Keyword(s):  
Functional Groups ◽  
Rainy Season ◽  
Habitat Heterogeneity ◽  
Longitudinal Variation ◽  
Tropical River ◽  
Phytoplankton Structure ◽  
Algal Associations ◽  
Longitudinal Pattern ◽  
Reduced Density

This study aims to analyse the influence of a cascade of reservoirs on the density, richness and functional groups of phytoplankton in the Contas River, a tropical river of Brazil. This river has two dams along its course, forming the Pedra and Funil reservoirs. Samples were collected over three consecutive years (Dec., 2007 to Dec., 2010) at 28 sampling stations along the river. We identified 198 species and the stretches downstream from the reservoirs showed greater richness. Chlorophyceae, followed by Bacillariophyceae and Cyanophyceae were the dominant groups and highest density was recorded during the rainy season. Overall, a longitudinal pattern in algal densities was found for both seasons, with the lowest values recorded in sections of the Pedra and Funil reservoirs and the highest densities in the downstream sections. Nine functional groups were identified (C, F, J, MP, S1, Sn, Td, Y, Ws); of these, F and J grouped the species with the highest relative abundance during the dry season, while the S1 group, represented by the cyanobacterium Planktothrix agardhii, was dominant in the rainy season. The present study showed a high longitudinal variation in the phytoplankton richness and density, attributed to the hydrological change between the lotic and lentic stretches. Furthermore, the effects of the cascade of reservoirs on phytoplankton, such as reduced density, increased richness and changes in algal associations, were strongly influenced by habitat heterogeneity found in this environment, as well as the rainfall in the region.

Aseuk Hatong Antara Seni Berkomunikasi dan Teknologi: Studi Fenomenologi tentang Budaya Bertani Ladang Masyarakat Tatar Karang Priangan Kabupaten Tasikmalaya

Metahumaniora ◽  
2017 ◽  
Vol 7 (3) ◽  
pp. 332
Author(s):  
Samson CMS
Keyword(s):  
Rainy Season ◽  
Research Method ◽  
Technology Development ◽  
Appropriate Technology ◽  
Musical Aesthetics ◽  
Research Show

ABSTRAKTidak mampunya kita mendalami pengetahuan asli kita sendiri mengakibatkanterjadinya disharmoni teknologi dengan kebutuhan di lapangan, tidak terkecuali TeknologiTepat Guna (TTG) dalam pertanian ladang. Tujuan penelitian ini adalah untuk mengetahuiperanan Aseuk Hatong dalam tradisi pertanian ladang di masyarakat Tatar Karang PrianganKabupaten Tasikmalaya yang religius Islami, tapi masih mempertahankan tradisi tersebut.Metode penelitian ini menggunakan studi fenomenologi Schutz. Hasil penelitian menunjukkanbahwa 1) Seni berkomunikasi: (kakawihan) dalam tradisi Aseuk Hatong adalah upayaharmonisasi antara petani dengan alam yang sedang kemarau melalui senandung ringan yangkontekstual. 2) Teknologi Tani: (Aseuk Hatong) adalah suatu alat untuk mengolah untuk tanahladang pada musim kemarau yang dibalut dengan estetika musikal sederhana khas petaniladang, hasil pengembangan teknologi yang tepat guna, menyenangkan, inovatif, fungsional,terjangkau, murah, dan ramah lingkungan. Dengan demikian, dapat dirumuskan bahwa TradisiAseuk Hatong di Tatar Karang Priangan merupakan media persuasif bertani di kala ngahuma(berladang) tidak dibarengi musim penghujan. Tradisi Aseuk Hatong juga merupakanpengembangan teknologi yang sangat memperhitungkan kearifan lokal yang berlaku.Kata kunci: aseuk hatong, kawih, komunikasi seni, teknologi tani, pertanian ladangABST RACTOur inability to deepen our own original knowledge results in disharmony of technologywith the needs in the field, including the Appropriate Technology (TTG) in agriculture. It istherefore that in any development it is often not harmonious with the needs of society. Theobjective of the research is to know the role of Aseuk Hatong in the agricultural tradition in theTatar Karang Priangan community of Tasikmalaya Regency whicht is religiously Islamic yetstill maintains the tradition. The research method is Schutz phenomenology study. The resultsof research show that (1) the art of communicating (kakawihan) in Aseuk Hatong tradition isa harmonious effort between farmers and the dry nature through mild, contextual humming.(2) Farm technology (Aseuk Hatong)is a tool to cultivate the soil, plowing the fields during thedry season by wrapping with simple typical musical aesthetics of field farmers as the resultsof appropriate technology development, fun, innovative, functional, affordable, cheap, andenvironmentally friendly. As the conclusion, it can be said that Aseuk Hatong Tradition in TatarKarang Priangan as a persuasive media farming during ngahuma (farming) not accompaniedby rainy season is a technology development that takes into account local wisdom occur.Keywords: aseuk hatong, kawih, art communication, farming technology

Environmental DNA for functional diversity

2018 ◽  
Author(s):  
Pierre Taberlet ◽  
Aurélie Bonin ◽  
Lucie Zinger ◽  
Eric Coissac
Keyword(s):  
Functional Groups ◽  
Functional Diversity ◽  
Environmental Dna ◽  
Soil Organisms ◽  
Meaningful Information ◽  
Dna Metabarcoding ◽  
Pros And Cons ◽  
Target Community

Chapter 10 “Environmental DNA for functional diversity” discusses the potential of environmental DNA to assess functional diversity. It first focuses on DNA metabarcoding and discusses the extent to which this approach can be used and/or optimized to retrieve meaningful information on the functions of the target community. This knowledge usually involves coarsely defined functional groups (e.g., woody, leguminous, graminoid plants; shredders or decomposer soil organisms; pathogenicity or decomposition role of certain microorganisms). Chapter 10 then introduces metagenomics and metatranscriptomics approaches, their advantages, but also the challenges and solutions to appropriately sampling, sequencing these complex DNA/RNA populations. Chapter 10 finally presents several strategies and software to analyze metagenomes/metatranscriptomes, and discusses their pros and cons.

scholarly journals The Role of Peptides in the Design of Electrochemical Biosensors for Clinical Diagnostics

Biosensors ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 246
Author(s):  
Patrick Severin Sfragano ◽  
Giulia Moro ◽  
Federico Polo ◽  
Ilaria Palchetti
Keyword(s):  
Functional Groups ◽  
Synthetic Peptides ◽  
Clinical Diagnostics ◽  
Electrochemical Biosensors ◽  
Practical Application ◽  
Design And Development ◽  
Electrode Surfaces ◽  
Electrochemical Transducers ◽  
Target Analyte

Peptides represent a promising class of biorecognition elements that can be coupled to electrochemical transducers. The benefits lie mainly in their stability and selectivity toward a target analyte. Furthermore, they can be synthesized rather easily and modified with specific functional groups, thus making them suitable for the development of novel architectures for biosensing platforms, as well as alternative labelling tools. Peptides have also been proposed as antibiofouling agents. Indeed, biofouling caused by the accumulation of biomolecules on electrode surfaces is one of the major issues and challenges to be addressed in the practical application of electrochemical biosensors. In this review, we summarise trends from the last three years in the design and development of electrochemical biosensors using synthetic peptides. The different roles of peptides in the design of electrochemical biosensors are described. The main procedures of selection and synthesis are discussed. Selected applications in clinical diagnostics are also described.

Microscopic Insights into Water Adsorption in Carbon Nanopore – The Role of Acidic and Basic Functional Groups and their Configurations

2021 ◽  
Author(s):  
Lumeng Liu ◽  
Wenmao Zeng ◽  
Shiliang Johnathan Tan ◽  
Meng Liu ◽  
Duong Do
Keyword(s):  
Functional Groups ◽  
Porous Carbon ◽  
Water Adsorption ◽  
Water Clusters ◽  
Pivotal Role

Functional groups (FGs) in porous carbon play a pivotal role in water adsorption by nucleating water clusters followed by their coalescence, the process for which is the precursor for the...

First comparison of quantitative estimates of termite biomass and abundance reveals strong intercontinental differences

2014 ◽  
Vol 30 (2) ◽  
pp. 143-152 ◽  
Author(s):  
Cecilia A.L. Dahlsjö ◽  
Catherine L. Parr ◽  
Yadvinder Malhi ◽  
Homathevi Rahman ◽  
Patrick Meir ◽  
...  
Keyword(s):  
Functional Groups ◽  
Functional Diversity ◽  
Ecosystem Processes ◽  
Global Scale ◽  
Species Density ◽  
Abundance Data ◽  
Standardized Protocol ◽  
Biogeographical Distribution ◽  
Belt Transect

Abstract:Termite species and functional groups differ among regions globally (the functional-diversity anomaly). Here we investigate whether similar differences in biomass and abundance of termites occur among continents. Biomass and abundance data were collected with standardized sampling in Cameroon, Malaysia and Peru. Data from Peru were original to this study, while data from Cameroon and Malaysia were compiled from other sources. Species density data were sampled using a standardized belt transect (100 × 2 m) while the biomass and abundance measurements were sampled using a standardized protocol based on 2 × 2-m quadrats. Biomass and abundance data confirmed patterns found for species density and thus the existence of the functional diversity anomaly: highest estimates for biomass and abundance were found in Cameroon (14.5 ± 7.90 g m−2 and 1234 ± 437 ind m−2) followed by Malaysia (0.719 ± 0.193 g m−2 and 327 ± 72 ind m−2) and then Peru (0.345 ± 0.103 g m−2 and 130 ± 39 ind m−2). The biomass and abundance for each functional group were significantly different across sites for most termite functional groups. Biogeographical distribution of lineages was the primary cause for the functional diversity anomaly with true soil-feeding termites dominating in Cameroon and the absence of fungus-growing termites from Peru. These findings are important as the biomass and abundance of functional groups may be linked to ecosystem processes. Although this study allowed for comparisons between data from different regions further comparable data are needed to enhance the understanding of the role of termites in ecosystem processes on a global scale.

Role of Functional Groups and Surfactant Charge in Regulating Chlorophyll Aggregation in Micellar Solutions

2002 ◽  
Vol 106 (6) ◽  
pp. 1446-1454 ◽  
Author(s):  
Angela Agostiano ◽  
Lucia Catucci ◽  
Giuseppe Colafemmina ◽  
Hugo Scheer
Keyword(s):  
Functional Groups ◽  
Micellar Solutions

The Role of Fluorine on the Structure and SHG Property of inorganic Selenites and Tellurites

2021 ◽  
Author(s):  
Fang Kong ◽  
Tingkun Jiang ◽  
Jiang-Gao Mao
Keyword(s):  
Functional Groups ◽  
Pure Oxide

Fluorine, as the most electronegative element, can replace the oxygen ligands of functional groups under given conditions. These fluoride groups are more or less different from the pure oxide groups...

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