Application of satellite imagery to analyse the distribution and recruitment of sardinella - Annual Report 2002

Remote sensing studies at the Netherlands Institute for Fisheries Research (RIVO) aim to stimulate the use of satellite images on board of Dutch freezer-trawlers in the Mauritanian Exclusive Economic Zone (MEEZ). During four research missions (5-12 July 2002, 23-30 August 2002, 13-20 October 2002, and 14-23 November 2002) NOAA-AVHRR images of sea surface temperatures (SST) and SeaWifs plankton images were used to locate the fronts at which sardinella, the target species of the Dutch fleet at West Africa, tend to concentrate. These ‘RIVO-images’ are transmitted biweekly with specified annotation to enable easy interpretation. Remote sensing helps locate target species and reduces by-catches associated with ‘random’ trawling. Satellite-derived time series are furthermore applied to analyse apparent spatial shifts of the stock in recent years. Comparison of catch data (size, location) with associated satellite-derived oceanography yields insight into the behaviour and migration patterns of sardinella

Search for Barents: Evaluation of possible burial sites on north Novaya Zemlya, Russia

Three cairns on northernmost Novaya Zemlya identified as possible rock-pile graves by Russian investigators in 1977 and 1988 were located and inspected for human remains. These cairns are in the area visited by Dutch seafarers between 17 and 22 June 1597, after their wintering on Novaya Zemlya, and may contain the body of Willem Barents. Barents and one of his crewmen died on 20 June 1597 while the winterers were on landfast ice close to shore. Previous research on Spitsbergen and contemporary reports on the efforts of 16th and 17th century Dutch seafarers to prepare a Christian grave led us to conclude that the deceased probably were buried on the beach, possibly in a shallow grave or a snowbank. Inspection of the area indicates that this grave probably was destroyed by high (5+ m asl) wave run-up during storms, cryogenic erosion, and animals (polar bear, fox). None of the cairns, or any of several other prominent rock piles in the ~180 km long search area, contained human remains or had lichen growths that would indicate construction ~400 years ago (>2 cm, Rhizocarpon sp.). Cairns were not reported by the Dutch in 1594-98, and most of those encountered on northern Novaya Zemlya probably date from exploration after ca. 1860, when the region north of ~76°N became accessible in a warming, post-Little Ice Age climat

New approach for studying macromolecular-ligand binding. Determination of the dissociation constant for macromolecule-bound ligand by gel filtration.

A graph is presented which permits facile determination of the dissociation constant constant for a macromolecule . ligand complex from gel filtration results; it can be used without a detailed understanding of the remainder of the text. When a solution of macromolecules and radioactive ligand is subjected to gel filtrations, the amount of ligand associated with the eluted macromolecule is easily measured. This quantity is then used for obtaining the corresponding dissociation constant from the graph. Values given in the graph had been determined from an equation, which is presented in the text, by means of a program which is run on a programmable calculator (Texas Instruments SR-52). It is also demonstrated how the validity of dissociation constants so obtained can be checked independently by means of a second calculation. A modification of these procedures permits determination of the dissociation constant for those situations where there is moderate dilution of the eluted sample relative to that applied to the gel filtration column, and the graph incorporates results from such calculations. The successful application of the present approach to the determination of the dissociation constants for a tubulin . [3H]GDP complex is described. Also, the potential importance of the present approach relative to other techniques for dissociation constant determination is discussed

Danmarks første lærebog i vejbygning var tysk

Veiledning til Hoved- og mindre Landeveies Bygning og Vedligeholdelse, af Heinrich Friherre v. Pechmann, blev udgivet i Danmark i 1838 og blev et vigtigt læremiddel

The use of satellite imagery in sardinella and sardine fisheries in the Mauritanian EEZ - Annual Report 2003

Remote sensing research missions on board Dutch freezer trawlers in the Mauritanian EEZ in 2003 have focused on the relationship between water temperature, trawling tactics, and by-catch. During the research missions, which last 8-12 days each, satellite images of sea surface temperature (SST) are received by the trawler on a daily basis and tows are planned on the basis of oceanographic information to limit search time and minimize by-catch of non-target species

Broen til Fanø

Anmeldelse af artikel i Sjæklen: Jørgen Burchardt: Broen til Fanø - 100 års mislykkede planer

Sum rules of codon usage probabilities

In the crystal basis model of the genetic code, it is deduced that the sum of usage probabilities of the codons with C and A in the third position for the quartets and/or sextets is independent of the biological species for vertebrates. A comparison with experimental data shows that the prediction is satisfied within about 5 %.Comment: 7 page

Search for Barents: Evaluation of Possible Burial Sites on North Novaya Zemlya, Russia

Three cairns on northernmost Novaya Zemlya identified as possible rock-pile graves by Russian investigators in 1977 and 1988 were located and inspected for human remains. These cairns are in the area visited by Dutch seafarers between 17 and 22 June 1597, after their wintering on Novaya Zemlya, and may contain the body of Willem Barents. Barents and one of his crewmen died on 20 June 1597 while the winterers were on landfast ice close to shore. Previous research on Spitsbergen and contemporary reports on the efforts of 16th and 17th century Dutch seafarers to prepare a Christian grave led us to conclude that the deceased probably were buried on the beach, possibly in a shallow grave or a snowbank. Inspection of the area indicates that this grave probably was destroyed by high (5+ m asl) wave run-up during storms, cryogenic erosion, and animals (polar bear, fox). None of the cairns, or any of several other prominent rock piles in the ~180 km long search area, contained human remains or had lichen growths that would indicate construction ~400 years ago (>2 cm, Rhizocarpon sp.). Cairns were not reported by the Dutch in 1594-98, and most of those encountered on northern Novaya Zemlya probably date from exploration after ca. 1860, when the region north of ~76°N became accessible in a warming, post-Little Ice Age climate.Trois cairns situés aux confins septentrionaux de la Nouvelle-Zemble et identifiés en 1977 et 1988 par des chercheurs russes comme pouvant signaler des amas de pierres funéraires ont été localisés et ont fait l'objet d'une inspection en vue de déterminer s'ils renfermaient des restes humains. Ces cairns se trouvent dans la région visitée par des navigateurs néerlandais entre le 17 et le 22 juin 1597, après leur hivernage en Nouvelle-Zemble, et ils auraient pu contenir le corps de Willem Barents. Ce dernier et un membre de son équipage périrent le 20 juin 1597, alors que les hivernants se trouvaient sur la glace près du rivage. Des recherches antérieures sur le Spitzberg et des rapports contemporains sur les efforts des marins néerlandais des XVIe et XVIIe siècles en vue de préparer une sépulture chrétienne nous amènent à la conclusion que les défunts ont probablement été enterrés sur la plage, voire dans une tombe peu profonde ou un amoncellement de neige. Un examen du site indique que cette tombe a probablement été détruite par un assaut puissant (+ 5 m ASL) des vagues au cours de tempêtes, par l'érosion cryogénique et par les animaux (ours polaire, renard). Aucun des cairns, et aucun des autres amas de rochers bien visibles situés dans la région de l'étude, qui s'étendait sur une longueur d'environ 180 km, ne renfermait de vestiges humains ou n'affichait une croissance lichénique qui aurait indiqué une construction remontant à près de 400 ans (> 2 cm, Rhizocarpon sp.) Les Néerlandais n'ont pas rapporté la présence de cairns entre 1594 et 1598 et ceux que l'on a retrouvés en Nouvelle-Zemble septentrionale datent probablement des explorations qui eurent lieu après environ 1860, quand la région située en gros au nord du 76° de latit. N. est devenue accessible dans le contexte d'un réchauffement climatique survenu au petit âge glaciaire

Systems biology via redescription and ontologies (I): finding phase changes with applications to malaria temporal data

Biological systems are complex and often composed of many subtly interacting components. Furthermore, such systems evolve through time and, as the underlying biology executes its genetic program, the relationships between components change and undergo dynamic reorganization. Characterizing these relationships precisely is a challenging task, but one that must be undertaken if we are to understand these systems in sufficient detail. One set of tools that may prove useful are the formal principles of model building and checking, which could allow the biologist to frame these inherently temporal questions in a sufficiently rigorous framework. In response to these challenges, GOALIE (Gene ontology algorithmic logic and information extractor) was developed and has been successfully employed in the analysis of high throughput biological data (e.g. time-course gene-expression microarray data and neural spike train recordings). The method has applications to a wide variety of temporal data, indeed any data for which there exist ontological descriptions. This paper describes the algorithms behind GOALIE and its use in the study of the Intraerythrocytic Developmental Cycle (IDC) of Plasmodium falciparum, the parasite responsible for a deadly form of chloroquine resistant malaria. We focus in particular on the problem of finding phase changes, times of reorganization of transcriptional control