scholarly journals Aerial root hydraulic conductivity increases with plant size for the aroid vine Rhodospatha oblongata (Araceae)

2018 ◽  
Vol 4 ◽  
pp. e006
Author(s):  
Arinawa Liz Filartiga ◽  
Ricardo Vieira ◽  
André Mantovani
Keyword(s):  
Hydraulic Conductivity ◽  
Plant Size ◽  
Positive Influence ◽  
Diameter Distribution ◽  
External Diameter ◽  
Anatomical Structures ◽  
Plant Canopies ◽  
Aerial Roots ◽  
Anatomical Parameters

Rhodospatha oblongata (Araceae) is an aroid vine which reaches maturity at trees canopies. The beginning of R. oblongata’s ascension towards the canopy occurs when one of the branches reaches the stem of a host, being able to reach eight to ten meters in height. Throughout this ascendant path R. oblongata develops two types of aerial roots: the anchor roots, which is shorter and adhered to the host, never reaching the soil; and the feeder roots, which is long, also adheres to the host but connects the vine to the forest soil. Both roots are here compared in morpho-physiological aspects related to the efficiency of axial hydraulic conductivity. Two hypotheses are tested: i) both roots present distinct xylem hydraulic conductivity; ii) hydraulic conductivity of both roots vary with plant size. The characterization of the roots was based on crescent R. oblongata individuals divided in five size classes. Thirty specimens of each anchor and feeder roots were analyzed along plant size increase. Both roots gradually increase in number and external diameter while the R. oblongata vertically ascends to reach plant canopies. The stele of both roots increase in diameter, in order to accommodate xylem vessels that became larger. The increase in these morpho-anatomical parameters has a positive influence on the xylem hydraulic conductivity, that also increases along the ascendant way of R. oblongata. Comparative measurements show that in general anchor roots present smaller morpho-anatomical structures and lower hydraulic conductivity in comparison to feeder roots. Xylem diameter distribution is unimodal for anchor roots, but bimodal for feeder ones. While all feeder roots present a great concentration of vessels around 60 mm of diameter, the second peak occurs at xylem diameter values that increase with plant size. These modifications optimize the root water transport while the vegetative body of R. oblongata increases in size, connecting its leaves at canopies to the soil water with elevated hydraulic efficiency

scholarly journals Caracterização de parâmetros hidráulicos em depósitos fluviais paleogênicos na Bacia de Volta Redonda, RJ

2007 ◽  
Vol 30 (2) ◽  
pp. 118-132
Author(s):  
Ana Carolina Lisbôa Barboza ◽  
Gerson Cardoso da Silva Jr ◽  
Claudio Limeira Mello
Keyword(s):  
Hydraulic Conductivity ◽  
Sedimentary Facies ◽  
Fine Sand ◽  
Sedimentary Deposits ◽  
Hydrogeological Parameters ◽  
Variable Head ◽  
Medium Reservoir ◽  
Maximum Permeability

The present study aims for the characterization of the hydrogeological parameters of the Paleogenic fluvial deposits of Volta Redonda Geological Basin, through hydraulic conductivity determinations and grain sized analyses. The overall goal was to produce a hydrogeological data base applicable to the characterization of hydrofacies (interconnected sedimentary bodies with distinct hydraulic properties) and the modeling groundwater flow. The used methods used consisted of in situ permeability determinations (Guelph permeameters) and laboratory tests (variable head permeameter), besides grain size analyses carried out in each sedimentary facies in the study area. These sedimentary facies were characterized by Marques (2006) and belong to the Resende and Pinheiral formations. The permeameter results were coherent to the sedimentological characteristics. The Resende Formation sedimentary deposits are constituted by medium to fine sand with presence of argillaceous matrix and present moderate to very low hydraulic conductivity, varying between 10-4 to 10-8 cm/s, which indicates a poor reservoir. The Pinheiral Formation presents sandy layers with conglomeratic lenses, limited by small thickness pelitic intervals, with a very low permeability, with a hydraulic conductivity varying between 10-5 to 10-7 cm/s. The upper layer has the maximum permeability, around 10-3 cm/s. This formation presents a medium reservoir characteristics and it must be taken into consideration that the upper layer has as role in recharge to the aquifer. From the results of hydraulic conductivity, that varies from 10-8 to 10-3 cm/s for the Resende and Pinheiral formations, it is concluded that these deposits a low to medium hydraulic conductivity, explaining the low productivity of the water-bearing multilayered aquifer of Volta Redonda Basin.

INFLUENCE BAROHYDROTHERMAL PROCESSING ON TECHNOLOGICAL PROPERTIES AND BIOLOGICAL VALUE OF GRAIN EINKORN

2018 ◽  
Author(s):  
В.В. СИРОТКИНА ◽  
А.С. ПРОКОПЕЦ ◽  
И.В. СУРУХАНОВА ◽  
Н.В. ИЛЬЧИШИНА
Keyword(s):  
Biochemical Characterization ◽  
Tetrahymena Pyriformis ◽  
Positive Influence ◽  
Comparative Assessment ◽  
Excess Pressure ◽  
Technological Properties ◽  
Biological Value ◽  
Qualitative And Quantitative ◽  
Different Parts

Дана биохимическая характеристика образцов зерна полбы кубанской селекции. Приведены результаты исследования биологической ценности этих образцов с использованием инфузории Tetrahymena pyriformis. Определены качественный и количественный составы поверхностной микрофлоры различных частей зерновки. Проведена барогидротермическая обработка (БГТО) зерна, и определено ее влияние на технологические и биологические свойства зерна полбы. Предложены и апробированы режимы БГТО образцов зерна полбы, увлажненного до 20, 25 и 30%, с отволаживанием зерна в течение 40 мин и последующим автоклавированием при избыточном давлении 0,1 МПа в течение 3, 5 и 10 мин. Установлено, что БГТО позволяет дезактивировать поверхностную микрофлору зерна полбы. Выявлено положительное влияние БГТО на увеличение биологической ценности зерна. Сравнительная оценка кулинарных свойств нативных зерен полбы и зерен полбы после БГТО показала сокращение времени варки крупы на 20 мин – с 60 до 40 мин. Biochemical characterization of grains einkorn Kuban breeding was given. The results of the study of the biological value of these samples with using Tetrahymena pyriformis are given. The qualitative and quantitative compositions of the surface microflora of different parts of the grain are determined. Barohydrothermal processing (BHTP) of grain is carried out, and its influence on technological and, biological of grain einkorn is defined. Regimes of BHTP samples of the grain einkorn moistened to 20, 25 and 30%, with the braving of the grain for 40 min and subsequent autoclaving at an excess pressure of 0,1 MPa within 3, 5 and 10 min are proposed and tested. It is established that BHTP allows to deactivate the surface microflora of the grain einkorn. Positive influence BHTP for increase the biological value of grain einkorn is revealed. A comparative assessment of the culinary properties of native grains einkorn and grains einkorn after BHTP showed a reduction in the time of cooking cereals by 20 min (from 60 to 40 min).

scholarly journals Synthesis and Characterization of a Lignin-Styrene-Butyl Acrylate Based Composite

Polymers ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1080
Author(s):  
Daniel López Serna ◽  
Perla Elizondo Martínez ◽  
Miguel Ángel Reyes González ◽  
Antonio Alberto Zaldívar Cadena ◽  
Erasto Armando Zaragoza Contreras ◽  
...  
Keyword(s):  
Contact Angle ◽  
Butyl Acrylate ◽  
Raw Materials ◽  
Positive Influence ◽  
Polymer Chains ◽  
Polymer Materials ◽  
Polymerization Process ◽  
Oh Groups ◽  
Water Measurement

In recent years, the pursuit of new polymer materials based on renewable raw materials has been intensified with the aim of reusing waste materials in sustainable processes. The synthesis of a lignin, styrene, and butyl acrylate based composite was carried out by a mass polymerization process. A series of four composites were prepared by varying the amount of lignin in 5, 10, 15, and 20 wt.% keeping the content of butyl acrylate constant (14 wt.%). FTIR and SEM revealed that the –OH functional groups of lignin reacted with styrene, which was observed by the incorporation of lignin in the copolymer. Additionally, DSC analysis showed that the increment in lignin loading in the composite had a positive influence on thermal stability. Likewise, Shore D hardness assays exhibited an increase from 25 to 69 when 5 and 20 wt.% lignin was used respectively. In this same sense, the contact angle (water) measurement showed that the LEBA15 and LEBA20 composites presented hydrophobic properties (whit contact angle above 90°) despite having the highest amount of lignin, demonstrating that the interaction of the polymer chains with the –OH groups of lignin was the main mechanism in the composites interaction.

Chemometric Evaluation of Ultraviolet–Visible (UV–Vis) Spectra for Characterization of Silver Nanowire Diameter and Yield

2019 ◽  
Vol 74 (2) ◽  
pp. 204-209
Author(s):  
Clifford S. Todd ◽  
Xiaoyun Chen
Keyword(s):  
Main Tool ◽  
Wire Diameter ◽  
Silver Nanowire ◽  
Diameter Distribution ◽  
Distribution Data ◽  
Data Set ◽  
Nanowire Diameter ◽  
Particle Yield ◽  
Vis Spectroscopy

The main tool used for routine screening of silver nanowire diameter and wire-to-particle yield is ultraviolet–visible (UV–Vis) spectroscopy. The normalized absorbance near 500 nm is generally taken to correlate with wire yield (lower absorbance means fewer particles and higher wire yield). The location of the UV–Vis peak near 375 nm is generally believed to correlate with wire diameter. These qualitative assessments are of unknown uncertainty. Improved microscopy-based analysis of wire diameter distribution and wire yield had recently been developed and were used to characterize synthesis products in parallel with UV–Vis data collection. Here we present results of leveraging this quantitative wire yield and diameter distribution data to quantitatively calibrate the UV–Vis methods for characterizing wire diameter and yield. Chemometric analysis was also applied to this UV–Vis data set and resulted in statistically significant models that can predict average wire diameter and wire/particle yield slightly better than the univariate method.

Ultrasonic Characterization of Biological Tissues

1985 ◽  
Vol 107 (4) ◽  
pp. 309-314 ◽  
Author(s):  
K. K. Shung
Keyword(s):  
Tissue Characterization ◽  
Biological Tissues ◽  
Acoustic Velocity ◽  
Anatomical Structures ◽  
Subjective Analysis ◽  
Additional Information ◽  
Ultrasonic Characterization ◽  
Ultrasonic Parameters ◽  
Relationship Of

Ultrasonic imaging has become increasingly important as a diagnostic tool in medicine because it is noninvasive and it can provide valuable information otherwise unattainable. However, at present, clinical interpretation of an ultrasonic image still mostly relies on recognition of boundaries and positional relationship of anatomical structures and a subjective analysis of the distribution or texture of echo amplitudes. Other potentially useful information carried back by the echoes is completely discarded. The aim of ultrasonic tissue characterization research is to develop methods to extract additional information from the returned echoes so that tissue pathology or abnormality can be reliably identifed and severity of the pathology objectively assessed with quantiative criteria. A number of ultrasonic parameters including acoustic velocity, impedance, attentuation and scattering, have been utilized in attempting to achieve this goal. In this paper, recent progress in this research will be discussed and relevant results presented.

scholarly journals Characterization of the anatomical structures involved in the contractile response of the rat lung periphery

1996 ◽  
Vol 118 (3) ◽  
pp. 734-740 ◽  
Author(s):  
Francesco G. Salerno ◽  
Hajime Kurosawa ◽  
David H. Eidelman ◽  
Mara S. Ludwig
Keyword(s):  
Contractile Response ◽  
Rat Lung ◽  
Anatomical Structures ◽  
Lung Periphery
Sign in / Sign up

Export Citation Format

Share Document