Infrared radiation measurements of combustion gases Fourth quarterly progress report, Apr. 1 - Jun. 30, 1965

Carbon dioxide fundamental absorption spectrum at 1500 deg Kelvi

Infrared radiation measurements of combustion gases third quarterly progress report, 1 jan. - 31 mar. 1965

Infrared absorption spectrum measurements of carbon monoxide - exhaust gase

The study of base heating by radiation from exhaust gases final report, oct. 1, 1963 - sep. 30, 1964

Base heating by radiation from exhaust gase

Barriers to active transport in Palmerston North

falsePalmerston North, New Zealan

Conditional probabilities of identity of genes at a locus linked to a marker

A method is given for determining the probabilities that genes are identical by descent, at a locus linked to a marker where phenotypic data are available. For tight linkage, such conditional probabilities of identity may differ very much from unconditional ones ; they depend on the dominance relationships between alleles at the marker locus, and on the allelic frequencies. Applications discussed refer to the calculation of general two-locus descent measures, to the validation of pedigrees from polymorphism analysis, and to the statistical detection of an association between a quantitative trait and a marked region of the genome.On donne une méthode pour calculer les probabilités d’identité entre des gènes d’un locus, conditionnées par l’observation des phénotypes en un locus marqueur lié. La méthode proposée réunit 2 approches : les probabilités d’identité conditionnelles, au locus marqueur, sont calculées en construisant les évènements possibles du processus de la ségrégation des gènes ; les probabilités conditionnelles d’identité en un locus voisin sont calculées ensuite par la méthode des arbres géniques, modifiée pour tenir compte des conditions réalisées au locus marqueur. Les résultats dépendent des relations de dominance entre allèles et des fréquences alléliques au locus marqueur ; pour une liaison étroite, ils peuvent être très différents des résultats non conditionnés. Les applications discutées concernent une méthode générale de calcul des coefficients d’identité à 2 locus, l’étude de la cohérence entre des données généalogiques et un polymorphisme génétique, et les méthodes de détection statistique d’une association entre un caractère quantitatif et une région marquée du génome

Gradient Clogging in Depth Filtration

We investigate clogging in depth filtration, in which a dirty fluid is ``cleaned'' by the trapping of dirt particles within the pore space during flow through a porous medium. This leads to a gradient percolation process which exhibits a power law distribution for the density of trapped particles at downstream distance x from the input. To achieve a non-pathological clogging (percolation) threshold, the system length L should scale no faster than a power of ln w, where w is the width. Non-trivial behavior for the permeability arises only in this extreme anisotropic geometry.Comment: 4 pages, 3 figures, RevTe

Protein secretion systems in bacterial-host associations, and their description in the Gene Ontology

Protein secretion plays a central role in modulating the interactions of bacteria with their environments. This is particularly the case when symbiotic bacteria (whether pathogenic, commensal or mutualistic) are interacting with larger host organisms. In the case of Gram-negative bacteria, secretion requires translocation across the outer as well as the inner membrane, and a diversity of molecular machines have been elaborated for this purpose. A number of secreted proteins are destined to enter the host cell (effectors and toxins), and thus several secretion systems include apparatus to translocate proteins across the plasma membrane of the host also. The Plant-Associated Microbe Gene Ontology (PAMGO) Consortium has been developing standardized terms for describing biological processes and cellular components that play important roles in the interactions of microbes with plant and animal hosts, including the processes of bacterial secretion. Here we survey bacterial secretion systems known to modulate interactions with host organisms and describe Gene Ontology terms useful for describing the components and functions of these systems, and for capturing the similarities among the diverse systems

Investigating thermal performance of PCM plates for free cooling applications in South Africa

Abstract: Free cooling involves using a thermal energy storage medium such as a phase change material (PCM) in order to store the ambient “cold” during the night when ambient air temperatures are lower compared to the indoor building temperatures and release this stored “cold” by using a heat transfer fluid (i.e. air) into the building during the day when higher ambient temperatures are experienced especially during the summer months. This paper assesses the free cooling potential in South Africa by using a set of Rubitherm RT25HC PCM plates. The performance of these PCM plates is assessed by benchmarking the ambient air cooled by the PCM plates during the day against the defined thermal comfort temperatures requirements. The influence of varying the air flow rate on the availability of thermal comfort temperatures at the PCM rig outlet is also studied. The results clearly show the potential of using PCM’s as a means of cooling higher ambient air temperature which is experienced in hot summer months to within thermal comfort temperatures for human occupancy in a building