Fugacity-Based Trophic Magnification Factors Characterize Bioaccumulation of Cyclic Methyl Siloxanes within an Urban Terrestrial Avian Food Web: Importance of Organism Body Temperature and Composition

2021 ◽  
Author(s):  
Katharine M. Fremlin ◽  
John E. Elliott ◽  
Pamela A. Martin ◽  
Tom Harner ◽  
Amandeep Saini ◽  
...  
Keyword(s):  
Body Temperature ◽  
Food Web ◽  
Magnification Factors

scholarly journals Levels of selected pesticides and trophic transfer of DDTs through the aquatic food web in the Lake Ziway ecosystem

2021 ◽  
Author(s):  
Mekuria Teshome Mergia ◽  
Ermias Weldemariam ◽  
Ole Eklo ◽  
Girma Yimer
Keyword(s):  
Mass Spectrometry ◽  
Food Web ◽  
Trophic Position ◽  
Magnification Factor ◽  
Aquatic Food Web ◽  
Magnification Factors ◽  
Wet Weight ◽  
Aquatic Food ◽  
Mean Concentration ◽  
Biota Samples

Abstract The levels of 27 selected pesticides and trophic biomagnification of DDT were investigated in biota samples of the Lake Ziway in the Rift valley region, Ethiopia. Pesticide residues were analyzed using gas chromatography coupled with mass spectrometry (GC MS). Carbon source and trophic position were calculated by using 13C and 15N stable isotopes, individually, and trophic magnification factors (TMFs) were inferred. Among pesticides analyzed, only DDT and its metabolites (o,pʹ-DDD, o,pʹ-DDE, p,pʹ-DDD, and p,pʹ-DDE) were quantified in biota samples. The most prominent metabolite was p,pʹ-DDE with mean concentration ranging from the 0.22-7.7ngg− 1 wet weight. Moreover, the ratio of DDT/DDD + DDE in all the biota samples was less than 1 signifying historical DDT application. The trophic magnification factor (TMF) for p,pʹ-DDE, and ΣDDT were 1.18 and 1.19 respectively. Regression of log [ΣDDT] vs TL (trophic level) among all biota species showed a significant correlation, indicating that DDTs are biomagnifying along with the food web of Lake Ziway. The concentrations of DDTs and other organochlorine pesticides found in biota from Lake Ziway were, in general, lower than studies found in previous studies carried out in the same lake.

scholarly journals Comment on “Bioaccumulation of Methyl Siloxanes in Common Carp (Cyprinus carpio) and in an Estuarine Food Web in Northeastern China”

2019 ◽  
Vol 78 (2) ◽  
pp. 163-173 ◽  
Author(s):  
Jaeshin Kim ◽  
Kent Woodburn ◽  
Katie Coady ◽  
Shihe Xu ◽  
Jeremy Durham ◽  
...  
Keyword(s):  
Food Web ◽  
Common Carp ◽  
Cyprinus Carpio ◽  
Northeastern China ◽  
Sample Collection ◽  
Bioconcentration Factors ◽  
Related Data ◽  
Common Carp Cyprinus Carpio ◽  
Magnification Factors ◽  
Biomagnification Factors

AbstractWe have reviewed a paper titled “Bioaccumulation of Methyl Siloxanes in Common Carp (Cyprinus carpio) and in an Estuarine Food Web in Northeastern China” by Xue et al., which was published in the Archives of Environmental Contamination and Toxicology in 2019. In the paper, the authors presented and discussed the measured bioconcentration factors (BCFs), biomagnification factors (BMFs), and trophic magnification factors (TMFs) of selected volatile methylsiloxanes in Shuangtaizi estuary in China. Although we appreciate their efforts for sample collection and data analysis, we have identified significant errors in calculations of BCFs, TMFs, and BMFs, as well as animal welfare issues and food web trophic level assumptions. Based on the data, we have attempted to correct some of the analysis and offered a more complete and robust interpretation of the related data, when possible. Collectively, these errors would likely lead to very different conclusions than yours in the paper.

Scanning Electron Microscopy and X-Ray Analyses of Dental Tissues from a Hibernator

1976 ◽  
Vol 34 ◽  
pp. 178-179
Author(s):  
M. L. Zimny ◽  
A. C. Haller
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Body Temperature ◽  
Ground Squirrel ◽  
Alveolar Bone ◽  
X Ray ◽  
Dental Tissues ◽  
Bone Minerals ◽  
Apical Tooth ◽  
Scanning Electron

During hibernation the ground squirrel is immobile, body temperature reduced and metabolism depressed. Hibernation has been shown to affect dental tissues varying degrees, although not much work has been done in this area. In limited studies, it has been shown that hibernation results in (1) mobilization of bone minerals; (2) deficient dentinogenesis and degeneration of alveolar bone; (3) presence of calculus and tears in the cementum; and (4) aggrevation of caries and pulpal and apical tooth abscesses. The purpose of this investigation was to study the effects of hibernation on dental tissues employing scanning electron microscopy (SEM) and related x-ray analyses.

High Fibrinopeptide A (FPA) Levels in Acute Non-Lymphocytic Leukemia Are Reduced by Heparin Administration

1984 ◽  
Vol 52 (03) ◽  
pp. 301-304 ◽  
Author(s):  
L Gugliotta ◽  
Silvana Viganò ◽  
A D’Angelo ◽  
Anna Guarini ◽  
S Tura ◽  
...  
Keyword(s):  
Body Temperature ◽  
Blast Cell ◽  
Lymphocytic Leukemia ◽  
Healthy Controls ◽  
Intravenous Bolus ◽  
Fibrinopeptide A ◽  
Cell Counts ◽  
Heparin Administration ◽  
Blast Cells ◽  
Baseline Values

SummaryPlasma levels of fibrinopeptide A (FPA) in 30 untreated patients with acute non-lymphocytic leukemia (ANLL) were significantly higher than in 30 healthy controls (p <0.001). Patients without laboratory signs of disseminated intravascular coagulation (DIC) had levels of FPA higher than controls (p <0.02) but markedly lower than patients with DIC (p <0.001). Five patients with M3 leukemia had a higher mean FPA level (p <0.02) and a lower peripheral blast cell count (p <0.05) than patients with other cytological subtypes of ANLL. When patients with M3 were excluded, a significant correlation was observed between the peripheral blast cell counts and the FPA levels (r = 0.66, p <0.001). FPA levels were similar with body temperature either above or below 38° C. After intravenous bolus of heparin FPA dropped to normal levels in 14 out of 17 patients who had high baseline values. These findings indicate that intravascular thrombin formation, which probably result from the expression of procoagulant activities of blast cells, is the main cause of high FPA in the majority of patients with acute non-lymphocytic leukemia.

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