Your search
Results 79 resources
-
Little is known about the life history of mayflies that inhabit temporary ponds. The purpose of this study was to observe and quantify life histories attributes of Siphlonurus typicus, which is known to reside in temporary ponds. Weekly samples of nymphs were taken from two temporary ponds in eastern Connecticut from March to June, 1999. Individuals were graded into 11 maturity classes, based on developmental characteristics, as a means of predicting population maturity rates. Head capsule widths (HCWs) were used to determine if growth occurred between maturity classes. Degree days were found to be an excellent predictor for population maturity (r2 = 0.963, p < 0.0001). Nymphs that hatched earlier in the year had larger HCWs than nymphs that hatched later in the year, possibly because of different temperature regimes. The University of Connecticut Forest pond (UCF) population matured faster than the Merrow Meadows pond (MER) population, but both sexes of the UCF population tended to be smaller than their counter parts from the MER population. Sex ratios were female bias for the UCF population (1.35:1), but were not different for the MER population. Adult emergence and mating occurred from 27 May to 21 June. There was a positive relationship between number of eggs per female and female body length. Oviposition at both sites occurred directly on the ponds, pond inlets, and outlets, indicating that pond populations were the result of local migrants as well as permanent residents. Temperature was a determining factor of maturity and fecundity for Siphlonurus typicus.
-
We prove two art gallery theorems in which the guards must guard one another in addition to the gallery. A set G of points (the guards) in a simple closed polygon (the art gallery) is a guarded guard set provided (i) every point in the polygon is visible to some point in G; and (ii) every point in G is visible to some other point in G. We prove that a polygon with n sides always has a guarded guard set of cardinality ⌊(3n-1)/7⌋ and that this bound is sharp (n5); our result corrects an erroneous formula in the literature. We also use a coloring argument to give an entirely new proof that the corresponding sharp function for orthogonal polygons is ⌊n/3⌋ for n≤6; this result was originally established by induction by Hernández-Peñalver. © 2003 Elsevier B.V.
-
Previous research suggests that teachers' knowledge about English word structure (e.g., the phonological structure of words and common orthographic patterns in English) may be limited, although this knowledge is important for effective teaching of word decoding. This study examined teacher education students' knowledge about word structure, and improvements in their knowledge as a result of instruction, using three tasks: graphophonemic segmentation, classification of pseudowords by syllable type, and classification of real words as phonetically regular or irregular. Participants came from a special education certification program and included both preservice and inservice teachers. Results indicated that prior preparation to teach reading influenced participants' initial performance on two of the three word-structure tasks (all but graphophonemic segmentation); however, prior experience in teaching reading did not influence word-structure knowledge. A subset of participants who received specific instruction about word structure improved their knowledge relative to a comparison group of teacher education students who did not receive word-structure instruction. Prior preparation did not influence participants' responsiveness to instruction. Conclusions support the viewpoint that teacher education must include information about English word structure for educators who will teach reading and suggest that sufficiently intensive instruction may be important in developing word-structure knowledge.
-
As social beings, we experience ourselves through interactions with others in daily routines that participate in the cultural practices and power relations of broader social structures. Social workers, and social scientists in general, however, have had difficulty conceptualizing and synthesizing this way of being in the world. This paper attempts to respond to that gap by discussing how clinical social workers can use the concept of working models as a tool for listening and understanding in psychotherapy. Utilizing a case example, the paper will discuss three working models, the enactment of power relations, cultural practices, and psychological processes, which provide an integrative framework to inform clinical work.
-
“The Role of Readability in Today's Classrooms” emphasizes the importance of providing students with materials on the appropriate level of challenge. Major readability formulas and leveling systems that might be used to assess the difficulty level of materials are reviewed. Because formulas are restricted to objective factors and leveling systems rely too heavily on subjective judgment, this article recommends using both objective and subjective factors when estimating readability levels. This article also recommends using readability/leveling systems as a way of noting textual difficulties that might need instructional intervention.
-
Surveys estimate that 3-6% of the patients seen by physicians are gay or lesbian. There are unique health risks of gays and lesbians that are important to the clinician in determining an accurate diagnosis, providing patient education, and arriving at an appropriate treatment plan. One of the most significant medical risks of these populations includes avoidance of routine health care and dissatisfaction with healthcare. Many of these healthcare risks are not addressed because of lack of communication based on a number of common assumptions including the assumption that the patient is heterosexual. This article includes a summary of the medical literature through computerized searches to March 2002 in MEDLINE, PsychInfo, HEALTHSTAR, and bibliographies in articles on health care with gay and lesbian patients. The search strategy included health care of gays and lesbians and clinician-patient communication, partner and family issues. Secondly, it will examine common communication barriers and provide strategies for enhancing communication with patients in a gender-neutral, non-judgmental manner including suggestions for enlisting the inclusion of patients' families. (C) 2002 Elsevier Science Ireland Ltd. All rights reserved.
Explore
Resource type
- Book (9)
- Book Section (1)
- Conference Paper (4)
- Journal Article (55)
- Report (10)