THE RELATIONSHIP OF CHIRONOMUS RIPARIUS LARVAL SE BODY BURDEN AND BODY CONCENTRATION TO LARVAL DRY MASS AND EFFECTS ON SENSITIVITY TO SELENIUM

2001 ◽  
Vol 20 (8) ◽  
pp. 1630
Author(s):  
T. Vernon Beaty ◽  
Albert C. Hendricks
Keyword(s):  
Body Burden ◽  
Dry Mass ◽  
Chironomus Riparius ◽  
Relationship Of ◽  
The Relationship ◽  
Body Concentration

scholarly journals Spectral Indices: In-Season Dry Mass and Yield Relationship of Flue-Cured Tobacco under Different Planting Dates and Fertiliser Levels

ISRN Agronomy ◽  
2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Ezekia Svotwa ◽  
J. Anxious Masuka ◽  
Barbara Maasdorp ◽  
Amon Murwira
Keyword(s):  
Spectral Characteristics ◽  
Dry Mass ◽  
Coefficient Of Determination ◽  
Planting Dates ◽  
Randomized Design ◽  
Crop Development ◽  
Best Fitting ◽  
Whole Plants ◽  
Relationship Of ◽  
The Relationship

This experiment investigated the relationship between tobacco canopy spectral characteristics and tobacco biomass. A completely randomized design, with plantings on the 15th of September, October, November, and December, each with 9 variety × fertiliser management treatments, was used. Starting from 6 weeks after planting, reflectance measurements were taken from one row, using a multispectral radiometer. Individual plants from the other 3 rows were also measured, and the above ground whole plants were harvested and dried for reflectance/dry mass regression analysis. The central row was harvested, cured, and weighed. Both the maximum NDVI and mass at untying declined with later planting and so was the mass-NDVI coefficient of determination. The best fitting curves for the yield-NDVI correlations were quadratic. September reflectance values from the October crop reflectance were statistically similar (P>0.05), while those for the November and the December crops were significantly different (P<0.05) from the former two. Mass at untying and NDVI showed a quadratic relationship in all the three tested varieties. The optimum stage for collecting spectral data for tobacco yield estimation was the 8–12 weeks after planting. The results could be useful in accurate monitoring of crop development patterns for yield forecasting purposes.

Assessing the toxicity of lead in sediments to Hyalella azteca: the significance of bioaccumulation and dissolved metal

1999 ◽  
Vol 56 (8) ◽  
pp. 1494-1503 ◽  
Author(s):  
Uwe Borgmann ◽  
Warren P Norwood
Keyword(s):  
Screening Tool ◽  
Water Concentration ◽  
Dry Mass ◽  
Overlying Water ◽  
Organic C ◽  
Complexing Capacity ◽  
Large Water ◽  
The Relationship ◽  
Pb Concentration ◽  
Body Concentration

The relationship between bioaccumulation and toxicity of Pb to Hyalella was the same for animals exposed to Pb in water alone and for those exposed to Pb-spiked sediments, provided that the animals were gut cleared before Pb analysis. The same critical body concentration (about 126 nmol·g dry mass-1) can be used to predict Pb toxicity in both water-only and sediment exposures. Furthermore, Pb bioavailability in Pb-spiked sediments was due primarily to dissolved metal: animals caged above the sediments accumulated the same amount of Pb and had the same mortality as animals exposed directly to sediment. Increasing the water to sediment ratio from 4:1 to 67:1 resulted in a lower dissolved organic C and lower total dissolved Pb concentration in the water but no change in bioavailable Pb (i.e., bioavailable Pb was not proportional to total dissolved Pb). The overlying water concentration may be a useful indicator of bioavailable Pb in sediment tests, provided a large water to sediment ratio is used to reduce the effect of sediment on overlying water quality (i.e., Pb-complexing capacity). Although less reliable than body concentration measurements, this could provide a useful screening tool for possible Pb-induced toxicity because it can be measured without test animals present.

scholarly journals 257 LEAF PETIOLE NITRATE AND POTASSIUM LEVELS IN POTTED PLANTS GROWN AT THREE NITROGEN AND POTASSIUM LEVELS

HortScience ◽  
1994 ◽  
Vol 29 (5) ◽  
pp. 466e-466
Author(s):  
Erica M. Bergman ◽  
Michelle Marshal ◽  
Brian Weesies ◽  
Bill Argo ◽  
John Biernbaum
Keyword(s):  
Leaf Blade ◽  
Dry Mass ◽  
Hydraulic Press ◽  
Water Soluble ◽  
Leaf Petiole ◽  
Potted Plants ◽  
Petiole Nitrate Concentration ◽  
Soluble Fertilizer ◽  
Relationship Of ◽  
The Relationship

Twelve species of flowering potted plants were grown in a peat-based medium with water soluble fertilizer concentrations of 50, 100, or 200 mg·liter-1 N and K2O. Leaf blade or leaf petiole samples were collected six to eight weeks after planting. Sap was expressed using a hydraulic press and levels of nitrate nitrogen and potassium were determined using Cardy flat sensor ion meters. Petiole nitrate level ranged from 520 to 6300 mg·liter-1 and potassium levels ranged from 870 to 3600 mg·liter-1. The petiole nitrate concentration and change in petiole nitrate levels with changes in media nitrate levels was crop dependent. Leaf blade nitrate and potassium concentrations were lower than leaf petiole concentrations. The relationship of petiole nitrate to final plant fresh and dry mass and appearance at flowering will be presented.

scholarly journals Morphophysiological characteristics of guanandi fruit and seeds during ripening and harvesting time

2018 ◽  
Vol 53 (2) ◽  
pp. 212-220 ◽  
Author(s):  
Rosemeire Carvalho da Silva ◽  
Elisa Serra Negra Vieira ◽  
Maristela Panobianco
Keyword(s):  
Dry Matter ◽  
Morphological Characteristics ◽  
Dry Mass ◽  
Native Plant ◽  
Harvesting Time ◽  
Calophyllum Brasiliense ◽  
Relationship Of ◽  
The Relationship ◽  
Days After Anthesis ◽  
Mass Accumulation

Abstract: The objective of this work was to determine the relationship of the morphological and physiological characteristics of guanandi (Calophyllum brasiliense) fruit and seeds with ripening and harvesting time. The reproductive cycle of a native plant population, located in the coast of the state of Paraná, Brazil, was monitored from anthesis until fruit dispersion, during three years. Monthly harvests were performed, and the morphological and physical aspects (color, size, dry mass, and moisture content) of fruit and embryos were evaluated, as well as the physiological ones (germination and vigor) of seeds. The ripening process of guanandi seeds occurred between 200 and 240 days after anthesis (DAA), with anthesis peak in February and fruit dispersion in October. The maximum dry matter mass accumulation was not synchronized with the maximum physiological potential of the seeds. Germination potential was reached close to the middle of the maturation process, and maximum vigor at the end of the cycle. Fruit external color did not change from 110 DAA onwards. The morphological characteristics related to harvesting time are fruit pulp and embryo weakly adherent to the endocarp and to the tegument, respectively, as well as the dark-brown color of these tissues.

Human Interphase Nuclei; Dry Mass and Fiber Diameter

1970 ◽  
Vol 28 ◽  
pp. 34-35
Author(s):  
H. M. Golomb ◽  
W. F. Engler ◽  
U. Mikel ◽  
G. F. Bahr
Keyword(s):  
Fiber Diameter ◽  
Dry Mass ◽  
Chromosome Preparation ◽  
Metaphase Chromosomes ◽  
Interphase Nuclei ◽  
Chromosomal Complement ◽  
Human Male ◽  
Group A ◽  
Relationship Of ◽  
The Relationship

Dry mass determinations of human male chromosomal homologues in each group (A through G) have previously been reported. In this report whole intact interphase nuclei present with the chromosome preparation are studied. The relationship of the dry mass of interphase nuclei to the total chromosomal complement dry mass (46, X, Y karyotype) and their respective fiber diameter is investigated.Interphase nuclei were photographed quantitatively with a Siemens Elmiskop IA, and measured with the intergrating photometer (Carl Zeiss IPM-2). Absolute dry mass was determined using latex spheres as standards. Fibers of both interphase nuclei and individual metaphase chromosomes were photographed at 19.000X and their diameters measured on a Nikon profile projector.

The relationship of the scleractinian corals to the rugose corals

Paleobiology ◽  
1980 ◽  
Vol 6 (02) ◽  
pp. 146-160 ◽  
Author(s):  
William A. Oliver
Keyword(s):  
Critical Points ◽  
Scleractinian Corals ◽  
Convincing Evidence ◽  
Early Triassic ◽  
Rugose Corals ◽  
History Of ◽  
The Subject ◽  
Relationship Of ◽  
The Relationship ◽  
Biologic Factors

The Mesozoic-Cenozoic coral Order Scleractinia has been suggested to have originated or evolved (1) by direct descent from the Paleozoic Order Rugosa or (2) by the development of a skeleton in members of one of the anemone groups that probably have existed throughout Phanerozoic time. In spite of much work on the subject, advocates of the direct descent hypothesis have failed to find convincing evidence of this relationship. Critical points are:(1) Rugosan septal insertion is serial; Scleractinian insertion is cyclic; no intermediate stages have been demonstrated. Apparent intermediates are Scleractinia having bilateral cyclic insertion or teratological Rugosa.(2) There is convincing evidence that the skeletons of many Rugosa were calcitic and none are known to be or to have been aragonitic. In contrast, the skeletons of all living Scleractinia are aragonitic and there is evidence that fossil Scleractinia were aragonitic also. The mineralogic difference is almost certainly due to intrinsic biologic factors.(3) No early Triassic corals of either group are known. This fact is not compelling (by itself) but is important in connection with points 1 and 2, because, given direct descent, both changes took place during this only stage in the history of the two groups in which there are no known corals.

Skeletal elements of crinoid echinoderms: High-resolution structural and microanalytical results

1983 ◽  
Vol 41 ◽  
pp. 194-195
Author(s):  
D. F. Blake ◽  
L. F. Allard ◽  
D. R. Peacor
Keyword(s):  
High Resolution ◽  
Marine Invertebrates ◽  
Sea Urchins ◽  
Structural Features ◽  
Sea Stars ◽  
High Resolution Tem ◽  
Relationship Of ◽  
The Relationship ◽  
Insight Into

Echinodermata is a phylum of marine invertebrates which has been extant since Cambrian time (c.a. 500 m.y. before the present). Modern examples of echinoderms include sea urchins, sea stars, and sea lilies (crinoids). The endoskeletons of echinoderms are composed of plates or ossicles (Fig. 1) which are with few exceptions, porous, single crystals of high-magnesian calcite. Despite their single crystal nature, fracture surfaces do not exhibit the near-perfect {10.4} cleavage characteristic of inorganic calcite. This paradoxical mix of biogenic and inorganic features has prompted much recent work on echinoderm skeletal crystallography. Furthermore, fossil echinoderm hard parts comprise a volumetrically significant portion of some marine limestones sequences. The ultrastructural and microchemical characterization of modern skeletal material should lend insight into: 1). The nature of the biogenic processes involved, for example, the relationship of Mg heterogeneity to morphological and structural features in modern echinoderm material, and 2). The nature of the diagenetic changes undergone by their ancient, fossilized counterparts. In this study, high resolution TEM (HRTEM), high voltage TEM (HVTEM), and STEM microanalysis are used to characterize tha ultrastructural and microchemical composition of skeletal elements of the modern crinoid Neocrinus blakei.

Studies on Leukemogenic and Sarcomagenic Viruses

1970 ◽  
Vol 28 ◽  
pp. 156-157
Author(s):  
Leon Dmochowski
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Morphological Properties ◽  
Mode Of Development ◽  
Relationship Of ◽  
The Relationship

Electron microscopy has proved to be an invaluable discipline in studies on the relationship of viruses to the origin of leukemia, sarcoma, and other types of tumors in animals and man. The successful cell-free transmission of leukemia and sarcoma in mice, rats, hamsters, and cats, interpreted as due to a virus or viruses, was proved to be due to a virus on the basis of electron microscope studies. These studies demonstrated that all the types of neoplasia in animals of the species examined are produced by a virus of certain characteristic morphological properties similar, if not identical, in the mode of development in all types of neoplasia in animals, as shown in Fig. 1.

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