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R H Ellis

Publications and source records attributed to R H Ellis.

At least 19 recordsLinked to original sources
PubMed2006

Temperature sensitivity of the low-moisture-content limit to negative seed longevity--moisture content relationships in hermetic storage.

UNLABELLED: BACKGROUND AND AIMS The negative logarithmic relationship between orthodox seed longevity and moisture content in hermetic storage is subject to a low-moisture-content limit (m(c)), but is m(c) affected by temperature? METHODS: Red clover (Trifolium pratense) and alfalfa (Medicago sativa) seeds were stored hermetically at 12 moisture contents (2-15 %) and five temperatures (-20, 30, 40, 50 and 65 degrees C) for up to 14.5 years, and loss in viability was estimated. KEY RESULTS: Viability did not change during 14.5 years hermetic storage at -20 degrees C with moisture contents from 2.2 to 14.9 % for red clover, or 2.0 to 12.0 % for alfalfa. Negative logarithmic relationships between longevity and moisture contents >m(c) were detected at 30-65 degrees C, with discontinuities at low moisture contents; m(c) varied between 4.0 and 5.4 % (red clover) or 4.2 and 5.5 % (alfalfa), depending upon storage temperature. Within the ranges investigated, a reduction in moisture content below m(c) at any one temperature had no effect on longevity. Estimates of m(c) were greater the cooler the temperature, the relationship (P < 0.01) being curvilinear. Above m(c), the estimates of C(H) and C(Q) (i.e. the temperature term of the seed viability equation) did not differ (P > 0.10) between species, whereas those of K(E) and C(W) did (P < 0.001). CONCLUSIONS: The low-moisture-content limit to negative logarithmic relationships between seed longevity and moisture content in hermetic storage increased the cooler the storage temperature, by approx. 1.5 % over 35 degrees C (4.0-4.2 % at 65 degrees C to 5.4-5.5 % at 30-40 degrees C) in these species. Further reduction in moisture content was not damaging. The variation in m(c) implies greater sensitivity of longevity to temperature above, compared with below, m(c). This was confirmed (P < 0.005).

Medicago sativa↗
PubMed2003

Mutant alleles at the rugosus loci in pea affect seed moisture sorption isotherms and the relations between seed longevity and moisture content.

Pea (Pisum sativum L.) mutant near-isogenic lines (RRrbrb, rrRbRb, rrrbrb) with lower starch but higher lipid contents, brought about by lesions in the starch biosynthetic pathway, had seed moisture sorption isotherms displaced below that of the wild type (RRRbRb). The negative logarithmic relationship between seed longevity and seed storage moisture content (%, f.wt basis), determined in hermetic storage at 65 degrees C, also differed: longevity in the mutant near-isogenic lines was poorer and less sensitive to moisture content than in the wild type (i.e. C(W) was lower). The low-moisture-content limit (m(c)) to this relation also differed, being lower in the mutant near-isogenic lines (5.4-5.9%) than in the wild type (6.1%). In contrast, all four near-isogenic lines showed no difference (P >0.25) in the negative semi-logarithmic relationship between equilibrium relative humidity (ERH) and seed longevity. It is concluded that the effect of these alleles at the r and rb loci on seed longevity was largely indirect; a consequence of their effect on seed composition and hence on moisture sorption isotherms. However, this explanation could not be invoked at moisture contents below m(c) where differences in longevity remained substantial (RRRbRb double that of rrrbrb). Hence, these mutant alleles affected seed longevity directly at very low moisture contents.

Alleles↗
PubMed1991

Uses of an empirically derived client typology based on level of functioning: twelve years of the CCAR.

The Colorado Client Assessment Record (CCAR) is a problem checklist and level of functioning rating instrument used to describe admission to a public mental health system. A brief, non-technical summary of recent research and administrative applications involving this instrument is presented. A stable factor structure, generalizable to several diverse client populations, is reported. Scaling procedures for measuring these procedures and a client typology based on this scaling are described. The client typology is differentially related to the types of services received and the costs of treatment episodes. The typology is also used to understand differences in case mixes and lengths of stay at two state hospitals.

Colorado↗
PubMed1986

Planning a continuum of residential/service settings for the chronically mentally ill: the Colorado experience.

Thinking regarding the needs of the chronically mentally ill has changed substantially in the post-deinstitutionalization period. Increasingly, the heterogeneity existing within this population has been recognized along with the need for an integrated continuum of residences and services. At a state level, this realization has stimulated the development of planning models which are used to predict the number and types of residential/service slots needed by the chronically mentally ill. In Colorado, a model was developed which uses data-based client profiles to predict needs along a continuum of services ranging from inpatient treatment to independent living with mental health support. In this paper, we discuss the development of the model and present the results of implementing it for a sample of 5,017 chronically mentally ill clients. The practical and heuristic value of the model is featured as well as its implications for further research.

Chronic Disease↗
PubMed1985

Insensitivity of erythrocyte 2,3-bisphosphoglycerate to changes in extracellular phosphate concentration in vitro.

Erythrocytes maintained in vitro under controlled conditions at pH 7.40 were unable to respond to changes in extracellular phosphate concentrations with changes in intracellular 2,3-bisphosphoglycerate content over an 8 h incubation period. Increased extracellular phosphate concentrations did not retard the rate at which 2,3-bisphosphoglycerate concentrations fell when erythrocytes were incubated at pH 7.10. Elevated extracellular phosphate concentrations did not increase the rate of recovery of intracellular 2,3-bisphosphoglycerate concentrations when erythrocytes were returned to pH 7.40 having been incubated at pH 7.10. The rate at which 2,3-bisphosphoglycerate concentrations increased under these latter conditions was too slow to counterbalance any effect that adjustment of blood pH may have on the position of the haemoglobin-oxygen dissociation curve during treatment of diabetic ketoacidosis.

2,3-Diphosphoglycerate↗
PubMed1984

Statewide treatment outcome assessment in Colorado: the Colorado Client Assessment Record (CCAR).

Colorado has been measuring mental health treatment outcome statewide for the past four years. The data system for it is built around the Colorado Client Assessment Record ( CCAR ), a multi-dimensional checklist and Level-of-Functioning ( LOF ) measure. The CCAR is used by the Colorado Division of Mental Health for needs assessment, defining target groups, estimating bed need and doing cost-effectiveness studies. An underlying structure consisting of seven independent scales has recently been established using factor-analytic methods. A rater effect was also discovered and mathematically removed, revealing reliable and valid LOF information heretofore unknown. The improved CCAR will hasten implementation of Colorado's long-range plan for treatment outcome assessment.

Colorado↗
PubMed1978

Blood levels of nitrous oxide during bronchoscopy.

Arterial blood levels of nitrous oxide have been measured during bronchoscopy using two types of ventilating bronchoscope. It seems unlikely that the blood levels of nitrous oxide achieved using these devices would contribute to a reduction in the incidence of awareness during this procedure.

Adult↗