Predicting the growth of the amphibian chytrid fungus in varying temperature environments.

Environmental temperature is a crucial abiotic factor that influences the success of ectothermic organisms, including hosts and pathogens in disease systems. One example is the amphibian chytrid fungus, (), which has led to widespread amphibian population declines. Understanding its thermal ecology is essential to effectively predict outbreaks.

Consistency, not speed: temporal regularity as a metacognitive cue.

We examined the hypothesis that skilled performance is monitored on the basis of fluency, where fluency is operationally defined as temporal regularity or rhythmicity rather than speed. Since error is often associated with variable timing, we tested the possibility that people use varied timing as a metacognitive cue. Using a sequential counting task, which may be representative of the broader class of skilled, multi-step tasks, we found that shifting between irregular and regular timing led to greater confidence ratings when the timing associated with the task was regular.

Variation in thermal performance of a widespread pathogen, the amphibian chytrid fungus Batrachochytrium dendrobatidis.

Rates of growth and reproduction of the pathogens that cause emerging infectious diseases can be affected by local environmental conditions; these conditions can thus influence the strength and nature of disease outbreaks. An understanding of these relationships is important for understanding disease ecology and developing mitigation strategies. Widespread emergence of the fungal disease chytridiomycosis has had devastating effects on amphibian populations.

A retrospective audit of the use of Prothrombinex-HT for refractory bleeding following adult cardiac surgery.

Objective: To review the frequency of use, possible efficacy and safety profile of Prothrombinex-HT (CSL Bioplasma, Melbourne, VIC) in treatment of patients with microvascular bleeding refractory to standard measures after cardiothoracic surgery.

Methods: A retrospective chart review was performed of 60 consecutive cardiothoracic surgical patients who received Prothrombinex-HT between February and August 2003. Data collected included baseline demographic information, nature and complexity of surgery, preoperative medications, baseline haematological parameters and evidence of clinically significant prothrombotic complications.

PsEma--a hitherto unnamed dermatologic entity with clinical features of both psoriasis and eczema.

Introduction: Recent advances in molecular biology have helped establish differences between psoriasis and a group of inflammatory skin disorders commonly referred to as eczema. The authors have observed significant overlap between these two conditions such that a distinction between them may not always be made, even with histologic examination of skin biopsy specimens.

Objective: To determine how frequently psoriasis patients present features of both psoriasis and eczema.

Atopic profiles, familial histories, and coexisting conditions associated with hand eczema.

Background: Many of the eczema cases seen by dermatologists involve the hands. The discomfort and embarrassment of hand dermatitis in any of its forms may compromise a patient's quality of life, causing frustrated attempts to identify the cause of the disease and engendering disappointment with treatment failures.

Methods: The authors assessed the severity scores for each patient, personal and familial histories of atopy, coexisting conditions, triggers of irritation, types of treatments, and their success rates.

Information acquisition strategies and the cognitive structure of arithmetic.

In three experiments, we examined the sensitivity of information acquisition strategies to the underlying cognitive structure of arithmetic tasks. Previous work has shown that individuals solve arithmetic problems more quickly when they consider operators before operands. The operators establish the goal, and the operands are then assimilated into that goal.

Changing paradigms in dermatology: topical immunomodulators within a permutational paradigm for the treatment of atopic and eczematous dermatitis.

The first formulation of a class of products called topical immuno modulators (TIMS) was approved for clinical use in December 2000 and released in February 2001. This product is tacrolimus in an ointment base, prescribed under the Protopic. The next TIM, pimecrolimus cream, was FDA approved in December 2001 and launched February 2002 in a cream vehicle under the Elidel.

Changing paradigms in dermatology: new ways to examine the skin using noninvasive imaging methods.

Detailed visualization of the skin in the practice of dermatology is key to a comprehensive examination and accurate diagnosis. Advancements in digital dermoscopy, microscopy, imaging and photography have formed an impressive arsenal with which dermatologists can offer state-of-the-art patient care while streamlining their clinical practice and improving their academic and research capacities. Many types of advanced imaging are used in the biologic sciences at the bench; however, our paper reviews the clinical, noninvasive in vivo human applications of these emerging technologies.

Exposure to perfluorooctane sulfonate during pregnancy in rat and mouse. I: maternal and prenatal evaluations.

The maternal and developmental toxicities of perfluorooctane sulfonate (PFOS, C8F17SO3-) were evaluated in the rat and mouse. PFOS is an environmentally persistent compound used as a surfactant and occurs as a degradation product of both perfluorooctane sulfonyl fluoride and substituted perfluorooctane sulfonamido components found in many commercial and consumer applications. Pregnant Sprague-Dawley rats were given 1, 2, 3, 5, or 10 mg/kg PFOS daily by gavage from gestational day (GD) 2 to GD 20; CD-1 mice were similarly treated with 1, 5, 10, 15, and 20 mg/kg PFOS from GD 1 to GD 17.

Human donor liver and serum concentrations of perfluorooctanesulfonate and other perfluorochemicals.

Perfluorooctanesulfonate (PFOS, CaF17SO3-) has been identified in the serum of nonoccupationally exposed humans and in serum and liver tissue in wildlife. The purpose of this investigation was to determine whether PFOS liver concentrations in humans are comparable to the approximate 30 ng/mL average serum concentrations reported in nonoccupationally exposed subjects. Thirty-one donors (16 male and 15 female, age range 5-74) provided serum and/or liver samples for analysis of PFOS and three other fluorochemicals: perfluorosulfonamide (PFOSA, C8F17SO2NH2), perfluorooctanoate (PFOA, C7F15CO2-), and perfluorohexanesulfonate (PFHxS, C6F13SO3-).

Temporal tuning in the acquisition of cognitive skill.

The temporal tuning hypothesis suggests that individuals adjust the timing of cognitive performances to achieve temporal coordination of mental processes and the data on which they operate, and that this adjustment becomes more precise with practice. Participants in two experiments performed self-paced multiple-step arithmetic tasks in which the information needed for each step was briefly displayed at the participants' request. Timing constraints were manipulated by varying between subjects the delay between requests and displays of information.

Activation mechanism of CDK2: role of cyclin binding versus phosphorylation.

Activation of the cyclin-dependent kinases is a two-step process involving cyclin binding followed by phosphorylation at a conserved threonine residue within the kinase activation loop. In this study, we describe the separate roles of cyclin A binding versus phosphorylation in the overall activation mechanism of CDK2. Interaction of CDK2 with cyclin A results in a partially active complex that is moderately defective in the binding of the protein substrate, but not ATP, and severely defective in both phosphoryl group transfer and turnover.