Drainage rearrangements and in situ diversification of an endemic freshwater fish genus from north‐eastern Brazilian rivers

2022 ◽  
Author(s):  
Silvia Britto Barreto ◽  
L. Lacey Knowles ◽  
Rilquer Mascarenhas ◽  
Paulo Roberto Antunes de Mello Affonso ◽  
Henrique Batalha‐Filho
Keyword(s):  
Freshwater Fish ◽  
North Eastern

Functional Group Protection

2013 ◽  
Author(s):  
Douglass F. Taber
Keyword(s):  
Secondary Amines ◽  
Primary Amines ◽  
Silyl Ether ◽  
Southern Illinois ◽  
Convenient Procedure ◽  
North Eastern ◽  
National University ◽  
Facile Preparation ◽  
The University

Bekington Myrboh of North-Eastern Hill University reported (Tetrahedron Lett. 2010, 51, 2862) a convenient procedure for the oxidative removal of a 1,3-oxathiolane 1 or a 1,3-dithiolane. Sang-Gyeong Lee and Yong-Jin Yoon of Gyeongsang National University developed (J. Org. Chem. 2010, 75, 484) the pyridazin-3(2H )-one 4 for the microwave-mediated deprotection of an oxime 3. Dario M. Bassani of Université Bordeaux 1 and John S. Snaith of the University of Birmingham devised (J. Org. Chem. 2010, 75, 4648) a procedure for the facile preparation of esters such as 6. Brief photolysis (350 nm) returned the parent carboxylic acid 7. Craig M. Williams of the University of Queensland prepared (Tetrahedron Lett. 2010, 51, 1158) the trithioorthoester 8 by iterative opening of epichlorohydrin. He found that the keto ester 9 could be efficiently released by Hg-mediated hydrolysis. Masatoshi Mihara of the Osaka Municipal Technical Research Institute established (Synlett 2010, 253) that even very congested alcohols such as 10 could be acetylated by acetic anhydride containing a trace of FeCl3. Colleen N. Scott, now at Southern Illinois University, developed (J. Org. Chem. 2010, 75, 253) a convenient procedure for the preparation of the hydridosilane 13, which on Mn catalysis added the alcohol 12 to make the unsymmetrical bisalkoxysilane 14. Sabine Berteina-Raboin of the Université d’Orléans found (Tetrahedron Lett. 2010, 51, 2115) that NaBH4 in EtOH cleanly removed the chloroacetates from 15. Both other esters and silyl ethers were stable under these conditions. Ram S. Mohan of Illinois Wesleyan University established (Tetrahedron Lett. 2010, 51, 1056) that Fe(III) tosylate in methanol selectively removed the alkyl silyl ether from 17 without affecting the aryl silyl ether. Alakananda Hajra and Adinath Majee of Visva-Bharati University effected (Tetrahedron Lett. 2010, 51, 2896) formylation of an amine 19 by heating with commercial 85% formic acid as the solvent in a sealed tube at 80°C. Although both primary and secondary amines could be effi ciently formylated, the primary amines were much more reactive. Doo Ok Jang of Yonsei University found (Tetrahedron Lett. 2010, 51, 683) that the conveniently handled CF3CCO2H (the acid chloride is a gas) could be activated in situ to selectively convert 22 into 24.

scholarly journals Prokaryotic Dynamics in the Meromictic Coastal Lake Faro (Sicily, Italy)

Diversity ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 37 ◽  
Author(s):  
Carmela Raffa ◽  
Carmen Rizzo ◽  
Marc Strous ◽  
Emilio De Domenico ◽  
Marilena Sanfilippo ◽  
...  
Keyword(s):  
Intergenic Spacer ◽  
Mixing Conditions ◽  
Coastal Lake ◽  
The North ◽  
Ribosomal Intergenic Spacer ◽  
North Eastern ◽  
Clear Identification ◽  
Catalyzed Reporter Deposition ◽  
Card Fish

Lake Faro, in the North-Eastern corner of Sicily (Italy), shows the typical stratification of a meromictic tempered basin, with a clear identification of the mixolimnion and the monimolimnion, separated by an interfacial chemocline. In this study, an annual-scaled study on the space-time distribution of the microbial communities in water samples of Lake Faro was performed by both ARISA (Amplified Ribosomal Intergenic Spacer Analysis) and CARD-FISH (Catalyzed Reporter Deposition-Fluorescence In Situ Hybridization) approaches. A correlation between microbial parameters and both environmental variables (i.e., temperature, pH, dissolved oxygen, redox potential, salinity, chlorophyll-a) and mixing conditions was highlighted, with an evident seasonal variability. The most significative differences were detected by ARISA between the mixolimnion and the monimolimnion, and between Spring and Autumn, by considering layer and season as a factor, respectively.

Coastal Sea Level Change from in the North Eastern Atlantic

2020 ◽  
Author(s):  
Luciana Fenoglio-Marc ◽  
Bernd Uebbing ◽  
Jürgen Kusche ◽  
Salvatore Dinardo
Keyword(s):  
Time Series ◽  
Sea Level ◽  
Sea Level Change ◽  
Altimeter Data ◽  
Level Change ◽  
The North ◽  
North Eastern ◽  
Coastal Sea

<p>A significant part of the World population lives in the coastal zone, which is affected by coastal sea level rise and extreme events. Our hypothesis is that the most accurate sea level height measurements are derived from the Synthetic Aperture Altimetry (SAR) mode. This study analyses the output of dedicated processing and assesses their impacts on the sea level change of the North-Eastern Atlantic. </p><p>It will be shown that SAR altimetry reduces the minimum usable distance from five to three kilometres when the dedicated coastal retrackers SAMOSA+ and SAMOSA++ are applied to data processed in SAR mode. A similar performance is achieved with altimeter data processed in pseudo low resolution mode (PLRM) when the Spatio-Temporal Altimeter sub-waveform Retracker (STAR) is used. Instead the Adaptive Leading Edge Sub-waveform retracker (TALES) applied to PLRM is less performant. SAR processed altimetry can recover the sea level heights with 4 cm accuracy up to 3-4 km distance to coast. Thanks to the low noise of SAR mode data, the instantaneous SAR and in-situ data have the highest agreement, with the smallest standard deviation of differences and the highest correlation. A co-location of the altimeter data near the tide gauge is the best choice for merging in-situ and altimeter data. The r.m.s. (root mean squared) differences between altimetry and in-situ heights remain large in estuaries and in coastal zone with high tidal regimes, which are still challenging regions. The geophysical parameters derived from CryoSat-2 and Sentinel-3A measurements have similar accuracy, but the different repeat cycle of the two missions locally affects the constructed time-series.</p><p>The impact of these new SAR observations in climate change studies is assessed by evaluating regional and local time series of sea level. At distances to coast smaller than 10 Kilometers the sea level change derived from SAR and LRM data is in good agreement. The long-term sea level variability derived from monthly time-series of LRM altimetry and of land motion-corrected tide gauges agrees within 1 mm/yr for half of in-situ German stations. The long-term sea level variability derived from SAR data show a similar behaviour with increasing length of the time series.</p><p> </p>

scholarly journals Spreading of brine in the Puck Bay in view of in-situ measurements

2018 ◽  
Vol 54 ◽  
pp. 00029
Author(s):  
Małgorzata Robakiewicz
Keyword(s):  
Coastal Waters ◽  
Near Field ◽  
Mixing Conditions ◽  
The North ◽  
North Eastern ◽  
Using Data ◽  
Under Construction ◽  
North Eastern Part ◽  
Puck Bay

Since autumn of 2010 in the north-eastern part of Poland underground gas stores are under construction by diluting salt deposits. A by-product of the technology applied is brine, which is discharged into the coastal waters of the Puck Bay (south Baltic Sea). In the pre-investment study a theoretical analysis of the mixing conditions in the near-field and far-field of the proposed installation was conducted. An extensive monitoring programme carried out since 2010 shows a good mixing of brine with the surrounding waters. Excess salinity due to the continuous discharge of brine estimated using data measured in situ is generally lower than permitted, i.e. not exceeding 0.5 psu in the near-field of installation.

scholarly journals Constraints on instantaneous ozone production rates and regimes during DOMINO derived using in-situ OH reactivity measurements

2012 ◽  
Vol 12 (15) ◽  
pp. 7269-7283 ◽  
Author(s):  
V. Sinha ◽  
J. Williams ◽  
J. M. Diesch ◽  
F. Drewnick ◽  
M. Martinez ◽  
...  
Keyword(s):  
Nitrogen Oxides ◽  
Point Sources ◽  
Ozone Production ◽  
Strong Wind ◽  
Production Rates ◽  
Air Masses ◽  
North Eastern ◽  
Marine Air ◽  
North Western

Abstract. In this study air masses are characterized in terms of their total OH reactivity which is a robust measure of the "reactive air pollutant loading". The measurements were performed during the DOMINO campaign (Diel Oxidant Mechanisms In relation to Nitrogen Oxides) held from 21/11/2008 to 08/12/2008 at the Atmospheric Sounding Station – El Arenosillo (37.1° N–6.7° W, 40 m a.s.l.). The site was frequently impacted by marine air masses (arriving at the site from the southerly sector) and air masses from the cities of Huelva (located NW of the site), Seville and Madrid (located NNE of the site). OH reactivity values showed strong wind sector dependence. North eastern "continental" air masses were characterized by the highest OH reactivities (average: 31.4 ± 4.5 s−1; range of average diel values: 21.3–40.5 s−1), followed by north western "industrial" air masses (average: 13.8 ± 4.4 s−1; range of average diel values: 7–23.4 s−1) and marine air masses (average: 6.3 ± 6.6 s−1; range of average diel values: below detection limit −21.7 s−1), respectively. The average OH reactivity for the entire campaign period was ~18 s−1 and no pronounced variation was discernible in the diel profiles with the exception of relatively high values from 09:00 to 11:00 UTC on occasions when air masses arrived from the north western and southern wind sectors. The measured OH reactivity was used to constrain both diel instantaneous ozone production potential rates and regimes. Gross ozone production rates at the site were generally limited by the availability of NOx with peak values of around 20 ppbV O3 h−1. Using the OH reactivity based approach, derived ozone production rates indicate that if NOx would no longer be the limiting factor in air masses arriving from the continental north eastern sector, peak ozone production rates could double. We suggest that the new combined approach of in-situ fast measurements of OH reactivity, nitrogen oxides and peroxy radicals for constraining instantaneous ozone production rates, could significantly improve analyses of upwind point sources and their impact on regional ozone levels.

Population dynamics and reproduction of wild longsnout seahorse Hippocampus reidi

2011 ◽  
Vol 92 (2) ◽  
pp. 421-427 ◽  
Author(s):  
Ana C.G. Mai ◽  
Gonzalo Velasco
Keyword(s):  
Mature Female ◽  
Natural Mortality ◽  
Von Bertalanffy ◽  
Growth Constant ◽  
Instantaneous Rate ◽  
A Value ◽  
Eastern Brazil ◽  
North Eastern ◽  
Size At Sexual Maturity

Life-history characteristics such as growth, mortality, and size at sexual maturity of the seahorse Hippocampus reidi were investigated in situ in north-eastern Brazil from August 2006 to July 2007. The von Bertalanffy growth constant K was estimated at 1.195 year−1 and L∞ was set as 20 cm according to Taylor's relationship, using a Lmax of 19 cm. The smallest male with a brood pouch and the smallest male with a fully mature pouch measured 9 and 9.5 cm (height), respectively, while the smallest mature female measured 8.8 cm. Appropriate reproductive individuals were recorded throughout the study, with peaks from May to November. The size of first effective reproduction (carrying embryos) was 12.4 cm for males, a value higher than previously reported. Estimated instantaneous rate of natural mortality ranged from 1.43 to 1.58 year−1. The estimated life span for the species was 30 months.

scholarly journals Significance of Baddeleyite for Paleoproterozoic PGE Deposits with Pt-Pd and Cu-Ni reefs (North-Eastern Fennoscandian Shield): New Results of U-Pb and LA-ICP-MS Studies

2020 ◽  
pp. 1-7
Author(s):  
Bayanova Т.B. ◽  
Drogobuzhskaya S.V. ◽  
Subbotin V.V. ◽  
Serov P.А. ◽  
Steshenko Е.N. ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Fennoscandian Shield ◽  
Layered Intrusions ◽  
Inductively Coupled ◽  
The North ◽  
Icp Ms ◽  
North Eastern ◽  
Plasma Mass Spectrometry ◽  
First Time

Baddeleyite is a significant mineral successfully applied in the U-Pb geochronology for the precise dating of mafic rocks from layered intrusions with the platinum group element (PGE) and Cu-Ni mineralization. The Fennoscandian Shield hosts several layered Pt-Pd, Co-Cr-Ni, and Ti-V occurrences in the Northern (Karelian) and Southern (Karelian-Finnish) belts. The aim of this study is to estimate the content and distribution of rare earth elements (REE) in baddeleyite and to calculate temperatures (Т, ̊С) of the U-Pb system closure and baddeleyite crystallization compared to zircon from Cu-Ni and Pt-Pd deposits in the north-eastern Fennoscandian Shield. For the first time, baddeleyite crystals from Cu-Ni (Monchepluton) and Pt-Pd (Monchetundra) reefs of the Monchegorsk ore area have been studied in situ by the laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) to measure the U-Pb age of formation and the REE content.

KEANEKARAGAMAN DAN KELIMPAHAN IKAN DI DANAU TES, BENGKULU SUATU UPAYA KONSERVASI SECARA IN-SITU

2008 ◽  
Vol 5 (1) ◽  
Author(s):  
Robi Binur
Keyword(s):  
Water Quality ◽  
Freshwater Fish ◽  
Diversity Index ◽  
In Situ Conservation ◽  
Total Abundance ◽  
Fish Family ◽  
Index Of Diversity ◽  
River Fish

<p><em>The research of the diversity and abundance of fish had been done at Tes Lake at the province of Bengkulu by using in-situ conservation. Observation and collecting of samples had been done in the mid of August to the mid of November 2002. Collecting of samples was done in 4 stations. There are 21 species of fish included 18 genera and 12 families which had been caught using gillnet (jaring insang), cast net (jala), fish pot (lukah/bubuh), fishline (pancing/tajur), and dip net (serok). Cyprinidae is the fish family which has most variety (8 species), while other families have only 2 and 1 species. The species of fish which had been caught were mostly river fish (freshwater fish). Based on the index of diversity (H’), the diversity of fish is medium between   0.78 – 1.27 with the highest diversity index is at station I (1.27) and the lowest is at station IV (0.78). The spread of fish based on uniformity index (E) is about 0.33 – 0.49 with the highest uniformity index is at station III (0.49) and the lowest is at station IV (0.33). The total abundance of fish which are collected during the research is 13,030 with the highest abundance is at station IV (4,643 fish) and the lowest is at station III (1,171 fish). Species of fish that are abundance and predominant are Puntius binotatus (C.V.) and Osteochilus hasseltii (C.V.) compared with others. The value of CPUE is 2.75 kg/trip with the highest value of CPUE is at station IV (4.6 kg/trip) and the lowest are at station II and III (1.7 kg/trip). The water quality of Tes Lake is still able to fishes living and fishery. The kinds of fish which are really valuable economically but  it’s extinction being threatened are Anguilla marmorata Benn. and Tor douronensis (C.V.)</em>.</p>

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