134 research outputs found
Recommended from our members
The Landing Obligation: State of Play on the Implementation: Lessons Learnt
This document provides an overview of a presentation held during the Industry and Policy Day at the IIFET 2016 Scotland conference in July 2016. The presentation was part of Session B2: Implementing the Landing Obligation in the Reformed CFP - Practical Challenges and Effects on Fishing Businesses - 2016 Story so far and Thoughts on Coming Years. The session was chaired by Jennifer Russell, and the presentation was given by Pim Visser.Proceedings of the Eighteenth Biennial Conference of the International Institute of Fisheries Economics and Trade, held July 11-15, 2016 at Aberdeen Exhibition and Conference Center (AECC), Aberdeen, Scotland, UK
Working Group on Electrical Trawling (WGELECTRA; outputs from 2021)
The Working Group on Electrical Trawling creates a platform for supra-national joint research projects on electro-trawling and scientific publications. The group also reviews all relevant studies on marine electrofishing and discusses the ongoing and upcoming research projects in the light of knowledge gaps. Research areas covered by the group included fishing tactics and dynamics, organisms and ecological impacts and selectivity of electro trawling. A study into the exploitation of local fishing grounds revealed that pulse trawlers and conventional tickler chain beam trawlers had similar tactics spending 10% of their tows searching for a fishing ground and spending 90% of their tows exploiting a fishing ground. In-situ field campaigns revealed a lower impact of pulse trawls on biogeochemical parameters compared to traditional beam trawl methods. Laboratory experiments found that while alternating or pulsed bipolar currents readily penetrated the sediment, biogeochemical effects appeared to be inhibited from occurring. The combined results concluded that the environmental impact of electricity from pulse trawls is relatively minor compared to the mechanical disturbances created from the same gears. Behavioral response thresholds for pulsed electric fields were determined in laboratory experiments for electroreceptive as well as non-electroreceptive fish species. Comparison of these thresholds to simulations of electric fields around commercial fishing gears suggest that electrical pulses are unlikely to substantially affect the investigated fish species outside the trawl track. A field study into direct mortality among fish and benthic organisms in the wake of pulse trawlers refuted claims that pulse trawling causes mass mortality among non-target species. A study into the selectivity of shrimp pulse trawling vs. traditional trawling concluded that that shrimp fishing using pulse gear does not result in higher amounts of undesired bycatches of small shrimp, fish and benthos when compared to the traditional shrimp beam trawl fisheries. The outline of a PhD project that started in 2021 into organism and ecological impacts of electrofishing for razor clams in Scottish shallow coastal habitats was presented and preliminary results were shared
CFU-S(11) activity does not localize solely with the aorta in the aorta-gonad-mesonephros region
The aorta-gonad-mesonephros (AGM) region is a potent hematopoietic site in
the midgestation mouse conceptus and first contains colony-forming
units-spleen day 11 (CFU-S(11)) at embryonic day 10 (E10). Because
CFU-S(11) activity is present in the AGM region before the onset of
hematopoietic stem cell (HSC) activity, CFU-S(11) activity in the complex
developing vascular and urogenital regions of the AGM was localized. From
E10 onward, CFU-S(11) activity is associated with the aortic vasculature,
and is found also in the urogenital ridges (UGRs). Together with data
obtained from organ explant cultures, in which up to a 16-fold increase in
CFU-S(11) activity was observed, it was determined that CFU-S(11) can be
increased autonomously both in vascular sites and in UGRs. Furthermore,
CFU-S(11) activity is present in vitelline and umbilical vessels. This,
together with the presence of CFU-S(11) in the UGRs 2 days before HSC
activity, suggests both temporally and spatially distinct emergent sources
of CFU-S(11). (Blood. 2000;96:2902-2904
Quantification and visualization of flow in small vessels of the Circle of Willis: time-resolved three-dimensional phase contrast MRI at 7T compared with 3T
Endothelialization of Intravascular Stents
Wide clinical application of intravascular stenting devices is currently limited by occlusion or intraluminal narrowing caused by thrombosis and neointimal thickening in a considerable percentage of implantations. We studied the possibility of seeding one of the currently availiable stents, a stainless steel, self‐expandable wire‐mesh, with endothelial cells in vitro. Endothelial cells, derived from human umbilical cord veins, could be successfully attached to stent filaments. In vivo stent implantations in porcine femoral arteries showed complete covering of stent wires by endothelium after 1 week. We conclude that coating of stents with autologous endothelial cells prior to implantation might protect against early thrombosis during the period in which a neointima is formed. (J Interven Cardiol 1988:1:2) Copyrigh
Cell type-specific acquired protection from crystal adherence by renal tubule cells in culture
Cell type-specific acquired protection from crystal adherence by renal tubule cells in culture.BackgroundAdherence of crystals to the surface of renal tubule epithelial cells is considered an important step in the development of nephrolithiasis. Previously, we demonstrated that functional monolayers formed by the renal tubule cell line, Madin-Darby canine kidney (MDCK), acquire protection against the adherence of calcium oxalate monohydrate crystals. We now examined whether this property is cell type specific. The susceptibility of the cells to crystal binding was further studied under different culture conditions.MethodsCell-type specificity and the influence of the growth substrate was tested by comparing calcium oxalate monohydrate crystal binding to LLC-PK1 cells and to two MDCK strains cultured on either permeable or impermeable supports. These cell lines are representative for the renal proximal tubule (LLC-PK1) and distal tubule/collecting duct (MDCK) segments of the nephron, in which crystals are expected to be absent and present, respectively.ResultsWhereas relatively large amounts of crystals adhered to subconfluent MDCK cultures, the level of crystal binding to confluent monolayers was reduced for both MDCK strains. On permeable supports, MDCK cells not only obtained a higher level of morphological differentiation, but also acquired a higher degree of protection than on impermeable surfaces. Crystals avidly adhered to LLC-PK1 cells, irrespective of their developmental stage or growth substrate used.ConclusionsThese results show that the prevention of crystal binding is cell type specific and expressed only by differentiated MDCK cells. The anti-adherence properties acquired by MDCK cells may mirror a specific functional characteristic of its in situ equivalent, the renal distal tubule/collecting ducts
New rat model that phenotypically resembles autosomal recessive polycystic kidney disease
Numerous murine models of polycystic kidney disease (PKD) have been
described. While mouse models are particularly well suited for
investigating the molecular pathogenesis of PKD, rats are well established
as an experimental model of renal physiologic processes. Han:SPRD-CY: rats
have been proposed as a model for human autosomal dominant PKD. A new
spontaneous rat mutation, designated wpk, has now been identified. In the
mutants, the renal cystic phenotype resembles human autosomal recessive
PKD (ARPKD). This study was designed to characterize the clinical and
histopathologic features of wpk/wpk mutants and to map the wpk locus.
Homozygous mutants developed nephromegaly, hypertension, proteinuria,
impaired urine-concentrating capacity, and uremia, resulting in death at 4
wk of age. Early cysts were present in the nephrogenic zone at embryonic
day 19. These were localized, by specific staining and electron
microscopy, to differentiated proximal tubules, thick limbs, distal
tubules, and collecting ducts. In later stages, the cysts were largely
confined to collecting ducts. Although the renal histopathologic features
are strikingly similar to those of human ARPKD, wpk/wpk mutants exhibited
no evidence of biliary tract abnormalities. The wpk locus maps just
proximal to the CY: locus on rat chromosome 5, and complementation studies
demonstrated that these loci are not allelic. It is concluded that the
clinical and renal histopathologic features of this new rat model strongly
resemble those of human ARPKD. Although homology mapping indicates that
rat wpk and human ARPKD involve distinct genes, this new rat mutation
provides an excellent experimental model to study the molecular
pathogenesis and renal pathophysiologic features of recessive PKD
- …