Biological significance of dead biomass retention trait in Mediterranean Basin species: an analysis between different successional niches and regeneration strategies as functional groups

AbstractThis study evaluated the adsorption of Cr6+ from aqueous solution using dead biomass of aquatic plants Salvinia molesta (Kariba weed) and Typha latifolia (broadleaf cattail). The batch experiments were carried out to study the effects of pH, adsorbent dose, initial metal concentration, contact time, agitation speed in rotation per minute (rpm), and temperature. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were used to characterize the adsorbent and analyze the functional groups and morphology of the adsorbent, respectively. The hydroxyl and amine groups were the main functional groups involved in the adsorption. Both adsorbents showed good results at pH 1, metal concentration of 20 mg/L for Cr6+ removal, and adsorption equilibrium was attained within 60 min with 150 rpm at 25 °C. The adsorption rate obtained was above 95% for both the adsorbents at a dose of 0.150 g for S. molesta and 0.8 g for T. latifolia. Isotherm and kinetic models were applied on the adsorption data. The monolayer adsorption capacity (qm) was found to be 33.33 mg/g for S. molesta and 10.30 mg/g for T. latifolia. The Langmuir isotherm was better fitted to S. molesta, while the Freundlich isotherm was better fitted to T. latifolia. It was reported that the pseudo-second-order model (R2 = 0.999) was better fitted to the adsorption data for both the adsorbents. The thermodynamic study was also conducted and found the adsorption process was exothermic and spontaneous. Results revealed the good adsorption potential of S. molesta and T. latifolia, and they can be used for the removal of hexavalent chromium.

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Quellung von Kollagen Reaktionen mit anorganischen und organischen Kationen

Zeitschrift für Naturforschung B ◽

10.1515/znb-1961-0803 ◽

1961 ◽

Vol 16 (8) ◽

pp. 496-509 ◽

Cited By ~ 11

Author(s):

Th. Nemetschek ◽

Hedi Gansler

Keyword(s):

Functional Groups ◽

Biological Significance ◽

The Body ◽

Collagen Fibrils ◽

Carboxyl Groups ◽

Two Dimensional ◽

Crystalline Swelling

Under the influence of dilute NaCl solutions at 38 °C, collagen fibrils experience a two-dimensional, inner-crystalline swelling, probably as a result of the shielding of the charges of the functional groups.Exposure of collagen to polyvalent ions (Ca2®, Sr2®, and La3) in concentrations higher than 0,4-molar leads to identical alterations of the collagen regardless of the concentration. The fibrils dissociate into longitudinal units of about 80 A diameter. Water can enter the interspaces. The crosslinking of protofibrils into 80 A units could be the result of Ca2⊕ or Sr2⊕ exchange in equimolar amounts.Under the influence of dodecylammonium collagen fibrils swell intensely probably as result of blocking of carboxyl groups.Exposure to other macro-cations present in the body also lead to swelling.All observations agree well with classical ideas of inner-crystalline swelling.The possible biological significance of the phenomena reported is discussed.

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Successional trends in standing dead biomass in Mediterranean basin species

Journal of Vegetation Science ◽

10.1111/j.1654-1103.2011.01262.x ◽

2011 ◽

Vol 22 (3) ◽

pp. 467-474 ◽

Cited By ~ 43

Author(s):

M.J. Baeza ◽

V.M. Santana ◽

J.G. Pausas ◽

V.R. Vallejo

Keyword(s):

Mediterranean Basin ◽

Dead Biomass ◽

Standing Dead

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Microstructural morphology of sphingolipid dispersions as investigated by freeze-fracture EM

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100141093 ◽

1995 ◽

Vol 53 ◽

pp. 944-945

Author(s):

Vitthal S. Kulkarni ◽

Wayne H. Anderson ◽

Rhoderick E. Brown

Keyword(s):

Acyl Chain ◽

Biological Significance ◽

Freeze Fracture ◽

Fatty Acyl ◽

Fatty Acyl Moiety ◽

Aqueous Dispersions ◽

Head Groups ◽

Lipid Species ◽

Microstructural Morphology ◽

Layer Chromatography

The biological significance of the sphingomyelins (SM) and monoglycosylated sphingolipids like galactosylceramides (GalCer) are well documented Our recent investigation showed tubular bilayers in the aqueous dispersions of N-nervonoyl GalCer [N-(24:lΔ15,cls) GalCer] (a major fatty acyl moiety of natural GalCer). To determine the influence of lipid head groups on the resulting mesophasic morphology, we investigated microstructural self-assemblies of N-nervonoyl-SM [N-(24:1 Δ15,cls) SM; the second most abundant sphingomyelin in mammalian cell membranes], 1- palmitoyl-2-nervonoyl phosphatidylcholine [PNPC] (the lipid species with the same acyl chain configuration as in N-(24: 1) GalCer) and also compared it with egg-SM by freeze-fracture EM.Procedures for synthesizing and purifying N-(24:1) GalCer, N-(24:1) SM, and PNPC have been reported . Egg-SM was purchased from Avanti Polar Lipids, Alabaster AL. All lipids were >99% pure as checked by thin layer chromatography. Lipid dispersions were prepared by hydrating dry lipid with phosphate buffer (pH 6.6) at 80-90°C (3-5 min), vigorously vortexing (1 min) and repeating this procedure for three times prior to three freeze-thaw cycles.

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Ultrastructural Localization Study of Carcinoembryonic Antigen (CEA) in Gastric Cancer: Immunoelectron Microscopic Observation

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100158807 ◽

1990 ◽

Vol 48 (3) ◽

pp. 252-253

Author(s):

Dong Yuming ◽

Yang Guanglin ◽

Wu Jifeng ◽

Chen Xiaolin

Keyword(s):

Gastric Cancer ◽

Intestinal Metaplasia ◽

Cancer Cells ◽

Microscopic Observation ◽

Biological Significance ◽

Ultrastructural Localization ◽

Mucinous Carcinoma ◽

Surface Glycoprotein ◽

Tubular Adenocarcinoma ◽

Pap Method

On the basis of light microscopic observation, the ultrastructural localization of CEA in gastric cancer was studied by immunoelectron microscopic technique. The distribution of CEA in gastric cancer and its biological significance and the mechanism of abnormal distribution of CEA were further discussed.Among 104 surgically resected specimens of gastric cancer with PAP method at light microscopic level, the incidence of CEA(+) was 85.58%. All of mucinous carcinoma exhibited CEA(+). In tubular adenocarcinoma the incidence of CEA(+) showed a tendency to rising with the increase of degree of differentiation. In normal epithelia and intestinal metaplasia CEA was faintly present and was found only in the luminal surface. The CEA staining patterns in cancer cells were of three types--- cytoplasmic, membranous and weak reactive type. The ultrastructural localization of CEA in 14 cases of gastric cancer was studied by immunoelectron microscopic technique.There was a little or no CEA in the microvilli of normal epithelia. In intestinal metaplasia CEA was found on the microvilli of absorptive cells and among the mucus particles of goblet cells. In gastric cancer CEA was also distributed on the lateral and basal surface or even over the entire surface of cancer cells and lost their polarity completely. Many studies had proved that the alterations in surface glycoprotein were characteristic changes of tumor cells. The antigenic determinant of CEA was glycoprotein, so the alterations of tumor-associated surface glycoprotein opened up a new way for the diagnosis of tumors.

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Improving integration between functional groups: A case in organization change and implications for theory and practice

PsycEXTRA Dataset ◽

10.1037/e611322012-293 ◽

1971 ◽

Author(s):

Warren G. Bennis ◽

Michael Beer ◽

Gerald R. Pieters ◽

Alan T. Hundert ◽

Samuel H. Marcus ◽

...

Keyword(s):

Functional Groups ◽

Organization Change ◽

Theory And Practice

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HYDROXYAPATITE, ALGINATE, AND CHITOSAN FOR BONE SCAFFOLDS: SPECTROSCOPY STUDY

Dentika Dental Journal ◽

10.32734/dentika.v19i2.457 ◽

2016 ◽

Vol 19 (2) ◽

pp. 93-100

Author(s):

Lalita El Milla

Keyword(s):

Tissue Engineering ◽

Bone Tissue Engineering ◽

Bone Tissue ◽

Functional Groups ◽

Bone Growth ◽

Three Dimensional ◽

Dimensional Structure ◽

Tissue Engineering Scaffolds ◽

Hydroxyapatite Powder ◽

Materials Used

Scaffolds is three dimensional structure that serves as a framework for bone growth. Natural materials are often used in synthesis of bone tissue engineering scaffolds with respect to compliance with the content of the human body. Among the materials used to make scafffold was hydroxyapatite, alginate and chitosan. Hydroxyapatite powder obtained by mixing phosphoric acid and calcium hydroxide, alginate powders extracted from brown algae and chitosan powder acetylated from crab. The purpose of this study was to examine the functional groups of hydroxyapatite, alginate and chitosan. The method used in this study was laboratory experimental using Fourier Transform Infrared (FTIR) spectroscopy for hydroxyapatite, alginate and chitosan powders. The results indicated the presence of functional groups PO43-, O-H and CO32- in hydroxyapatite. In alginate there were O-H, C=O, COOH and C-O-C functional groups, whereas in chitosan there were O-H, N-H, C=O, C-N, and C-O-C. It was concluded that the third material containing functional groups as found in humans that correspond to the scaffolds material in bone tissue engineering.

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Water vapour accumulation mechanisms in the Western Mediterranean Basin and the development of European extreme rainfalls

Tethys Journal of Weather and Climate of the Western Mediterranean ◽

10.3369/tethys.2011.8.10 ◽

2011 ◽

Cited By ~ 3

Author(s):

Sáez de Cámara

Keyword(s):

Water Vapour ◽

Mediterranean Basin ◽

Western Mediterranean ◽

Western Mediterranean Basin

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RIBONUCLEOPROTEIN PARTICLES CONTAINING mRNA and pre-mRNA

Acta Endocrinologica ◽

10.1530/acta.0.074s130 ◽

1973 ◽

Vol 74 (Suppl) ◽

pp. S130-S167 ◽

Cited By ~ 15

Author(s):

O. P. Samarina ◽

E. M. Lukanidin ◽

G. P. Georgiev

Keyword(s):

Structural Organization ◽

General Scheme ◽

Biological Significance ◽

Mrna Transport ◽

Ribonucleoprotein Particles ◽

Mrna Precursor

ABSTRACT This paper is a review of the data concerning the nature, structural organization, properties and biological significance of the particles, containing mRNA and pre-mRNA (precursor of mRNA), i. e., (1) nuclear pre-mRNA-containing particles (2) free cytoplasmic mRNP (ribonucleoproteins), or informosomes (3) polysome-bound mRNP. Some new data on the comparison of nuclear and cytoplasmic particles, the nature of poly A-containing structures, involvement of informofers in Adenovirusspecific RNA transfer are presented. The general scheme of mRNA transport from nucleus to cytoplasm is discussed.

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