scholarly journals Structural characterization of a variety of spider silks from Turkey using different biophysical techniques

2011 ◽  
Vol 25 (3-4) ◽  
pp. 155-167 ◽  
Author(s):  
Semra İde ◽  
Sevgi Haman Bayarı ◽  
Tuncay Türkeş ◽  
Y. Orhan Mergen ◽  
Ömer Çelik ◽  
...  
Keyword(s):  
Size Range ◽  
Salt Lake ◽  
Natural Habitats ◽  
Nano Structure ◽  
Black Sea Region ◽  
Silk Fibers ◽  
Spider Species ◽  
Mean Size ◽  
Spider Silks

Various experimental methods (XRD, FTIR, SAXS, DLS and SEM) were used to investigate structures of the silk samples weaved by spiders in Turkey. Silk samples were collected from the natural habitats belonging to the spider species (i.e., Near Salt Lake/şereflikoçhisar, İvriz Dam/Ereǧli-Konya, Karataş Lake/Burdur and several locations in Black Sea Region of Turkey). Among all collected species, Araneidae(Araneus angulatus, Argiope bruennichi, Argiope lobata, Larinoides cornutus), Eresidae(Eresus cinnaberinus), Agelenidae(Agelena labyrinthica), Oecobidae(Uroctea durandi), Miturgidae(Cheiracanthium erraticum), Salticidae(Heliophanus flavipes, Philaeus chrysops), Theridiidae(Steatoda paykulliana)and Gnaphosidae were found significant amongst other spider species. Structural differences and similarities of these species were reported. Diameter range of draglines, inter crystallite distance of nano-size structures, mean size range of nano-structure aggregations, crystallite size range, information about protein content were obtained. The mechanical properties of some silk fibers were also investigated.

scholarly journals Characterization of spider silks weaved by different species living in the Black Sea region of Turkey

2008 ◽  
Vol 64 (a1) ◽  
pp. C28-C28
Author(s):  
P. Batat ◽  
S. Ide ◽  
T. Turkes ◽  
O. Mengen ◽  
Y. Ozcan ◽  
...  
Keyword(s):  
Black Sea ◽  
The Black Sea ◽  
Black Sea Region ◽  
Spider Silks

Characterization of the morning transition from downslope to upslope winds and its connection with the nocturnal inversion breakup at the foot of a gentle slope

2021 ◽  
Author(s):  
Sofia Farina ◽  
Dino Zardi ◽  
Silvana Di Sabatino ◽  
Mattia Marchio ◽  
Francesco Barbano
Keyword(s):  
Salt Lake ◽  
Vertical Direction ◽  
Blow Down ◽  
Physical Mechanisms ◽  
Morning Transition ◽  
Thermally Driven ◽  
Slope Wind ◽  
Slope Flow ◽  
Nocturnal Inversion

<p>Thermally driven winds observed in complex terrain are characterized by a daily cycle dominated by two main phases: a diurnal phase in which winds blow upslope (anabatic), and a nocturnal one in which they revert their direction and blow down slope (katabatic). This alternating pattern also implies two transition phases, following sunrise and sunset respectively. </p><p>Here we study the up-slope component of the slope wind with a focus on the morning transition based on from the MATERHORN experiment, performed in Salt Lake Desert (Utah) between Fall 2012 and Spring 2013. </p><p>The analysis develops along three main paths of investigation. The first one is the selection of the suitable conditions for the study of the diurnal component and the characterization of the morning transition. The second one focuses on the deep analysis of the erosion of the nocturnal inversion at the foot of the slope in order to investigate the physical mechanisms driving it. And the third one consists in the comparison between the experimental data and the results of an analytical model (Zardi and Serafin, 2015). The study of the morning transition in the selected case studies allowed its characterization in terms of the relation with the solar radiation cycle, in terms of its seasonality and in terms of its propagation along the slope and along the vertical direction. Most of the results of this investigation are related to the identification of the main mechanisms of erosion of the nocturnal inversion at the foot of the slope and to its role to the beginning of the transition itself. Finally, it is shown how the above model can fairly reproduce the cycle between anabatic and katabatic flow and their intensity.</p><p>Zardi, D. and S. Serafin, 2015: An analytic solution for daily-periodic thermally-driven slope flow. Quart. J. Roy. Meteor. Soc., 141, 1968–1974.</p>

WILD PEAVINE SPECIES (LATHYRUS L.): CHARACTERIZATION OF ACCESSIONS IN TERMS OF PROTEIN CONTENT IN THEIR SEEDS AND GREEN BIOMASS

2020 ◽  
Author(s):  
M.O. BURLYAEVA ◽  
◽  
A.E. SOLOVEVA ◽  
E.A. SERGEEV ◽  
N.I. TOPILSKAYA ◽  
...  
Keyword(s):  
Protein Content ◽  
Grain Legumes ◽  
Natural Habitats ◽  
Fodder Crops

The catalogue presents the results of the assessment of protein content in green biomass and seeds of 367 accessions from the VIR collection, representing 25 wild peavine species, during their introduction into Ukraine and into Leningrad and Tambov Provinces of Russia. Besides, it includes the data on the protein content in green biomass of 65 accessions, representing 12 wild peavine species, collected in their natural habitats in Russia and China. The catalogue is addressed to experts in fodder crops and grain legumes.

Identification and Morphological-Physiological Characterization of Astaxanthin Producer Strains of Haematococcus pluvialis from the Black Sea Region

2018 ◽  
Vol 54 (6) ◽  
pp. 639-648
Author(s):  
E. S. Chelebieva ◽  
N. V. Dantsyuk ◽  
K. A. Chekanov ◽  
I. N. Chubchikova ◽  
I. V. Drobetskaya ◽  
...  
Keyword(s):  
Black Sea ◽  
Haematococcus Pluvialis ◽  
The Black Sea ◽  
Black Sea Region ◽  
Physiological Characterization ◽  
Producer Strains

scholarly journals Bioacoustic characterization of mating calls of a freshwater fish (Prochilodus magdalenae) for passive acoustic monitoring

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Sebastián Muñoz-Duque ◽  
Silvia López-Casas ◽  
Héctor Rivera-Gutiérrez ◽  
Luz Jiménez-Segura
Keyword(s):  
Pulse Rate ◽  
Peak Frequency ◽  
Acoustic Monitoring ◽  
Passive Acoustic Monitoring ◽  
Natural Habitats ◽  
Train Duration ◽  
Acoustic Characterization ◽  
Species Specific ◽  
Passive Acoustic

Fish produce sounds that are usually species-specific and associated with particular behaviors and contexts. Acoustic characterization enables the use of sounds as natural acoustic labels for species identification. Males of Prochilodus magdalenae produce mating sounds. We characterized  these sounds and tested their use in natural habitats, to use passive acoustic monitoring for spawning ground identification. We identified two types of acoustic signals: simple pulses and pulse trains. Simple pulses were 13.7 ms long, with peak frequency of 365 Hz, whereas pulse train were 2.3 s long, had peak frequency of 399 Hz, 48.6 pulses and its pulses lasted 12.2 ms, with interpulse interval of 49.0 ms long and 22.3 Hz pulse rate. We did not detect spawning in  absence of male calls nor differences in male sounds at different female densities. We found differences in train duration, pulse rate, and pulse duration in trains, according to the fish's source sites, but these sites were not well discriminated based on bioacoustical variables. In rivers, we located two P. magdalenae spawning grounds and recognized calls from another fish species (Megaleporinus muyscorum). We did not find a significant relationship between fish size and call peak frequency for P. magdalenae.

scholarly journals Characterization of cellulose acetate based on empty fruit bunches and dried jackfruit leaves as replacement candidates for microbeads

2018 ◽  
Vol 67 ◽  
pp. 04024
Author(s):  
Dewi Tristantini ◽  
Andersen Yunan
Keyword(s):  
Water Absorption ◽  
Cellulose Acetate ◽  
Size Range ◽  
Acid Anhydride ◽  
Particle Sizes ◽  
Oil Absorption ◽  
Empty Fruit Bunches ◽  
Alternative Sources ◽  
Beauty Products

Scrubs used in other skin care and beauty products usually contain tiny fine grains of synthetic polymer called microbeads that usually pose threats to marine environment. Empty Fruit Bunches (EFB) and Dried Jackfruit Leaves (DJL) as organic and environmentally friendly can be alternative sources for polymer microbeads. Cellulose acetate is prepared by acetylation reaction between cellulose and acetic acid anhydride. Cellulose from EFB and DJL was extracted through a process of delignification with 12% NaOH treatment for EFB and 10% for DJL to obtain maximum yields of 38.964% and 14.449% respectively, followed by bleaching using peroxide 10 %. The formed cellulose acetate with 88.5% and 79.7% yield respectively is then filtered using a sieve mash 60 and 80 to obtain particle sizes ranging that are in the microbeads size range. The density test resulting in 0.73 g/cm3 and 0.52 g/cm3 respectively for EFB and DJL. Then, physical characteristic test was done by water and oil absorption test with variation at 25°C and 40°C. EFB at 25°C and 40°C shows water absorption at 23.39% and 26.09% and oil absorption at 7.59% and 13.95%. DJL at 25°C and 40°C shows water absorption at 22.56% and 27.32% and oil absorption at 13.09% and 15.36%.

Nano-structure and characterization of carbon composite with Al3+ and Mn4+ co-doped Li4Ti5O12 as anodes for Li-ion batteries

2020 ◽  
Vol 816 ◽  
pp. 152609 ◽  
Author(s):  
Shuai Zou ◽  
Gang Wang ◽  
Yiming Zhang ◽  
Caihong Xue ◽  
Huiyuan Chen ◽  
...  
Keyword(s):  
Carbon Composite ◽  
Li Ion Batteries ◽  
Nano Structure ◽  
Li Ion ◽  
Co Doped
Sign in / Sign up

Export Citation Format

Share Document