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https://www.readbyqxmd.com/read/28095304/adaptive-significance-of-critical-weight-for-metamorphosis-in-holometabolous-insects
#1
Ken-Ichi Hironaka, Yoshihiro Morishita
Holometabolous insect larvae become committed to metamorphosis when they reach a critical weight. Although the physiological mechanisms involved in this process have been well-studied, the adaptive significance of the critical weight remains unclear. Here, we developed a life history model for holometabolous insects and evaluated it from the viewpoint of optimal energy allocation. We found that, without a priori assumptions about critical weight, the optimal growth schedule is always biphasic: larval tissues grow predominately until they reach a certain threshold, after which the imaginal tissues begin rapid growth, suggesting that the emergence of a critical weight as a phase-transition point is a natural consequence of optimal growth scheduling...
January 14, 2017: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/28094658/effects-of-negative-affectivity-and-odor-valence-on-chemosensory-and-symptom-perception-and-perceived-ability-to-focus-on-a-cognitive-task
#2
Steven Nordin, Lina Aldrin, Anna-Sara Claeson, Linus Andersson
The aim was to gain understanding for the impact of negative affectivity (NA) and odor valance on perceptual aspects during low-level odorous exposure. Fifty-five young adults who were either relatively low or high in NA (anxiety, depression, and somatization) were randomized for exposure to either limonene (pleasant odor) or pyridine (unpleasant odor). In an exposure chamber, they took part in baseline, blank and stable exposure sessions, during which they rated odor intensity, impact on ability to focus on an imagined cognitive task, and intensity of symptoms...
January 1, 2017: Perception
https://www.readbyqxmd.com/read/28092921/the-ligand-sas-and-its-receptor-ptp10d-drive-tumour-suppressive-cell-competition
#3
Masatoshi Yamamoto, Shizue Ohsawa, Kei Kunimasa, Tatsushi Igaki
Normal epithelial cells often exert anti-tumour effects against nearby oncogenic cells. In the Drosophila imaginal epithelium, clones of oncogenic cells with loss-of-function mutations in the apico-basal polarity genes scribble or discs large are actively eliminated by cell competition when surrounded by wild-type cells. Although c-Jun N-terminal kinase (JNK) signalling plays a crucial role in this cell elimination, the initial event, which occurs at the interface between normal cells and polarity-deficient cells, has not previously been identified...
January 16, 2017: Nature
https://www.readbyqxmd.com/read/28087727/bioethics-and-imagination-towards-a-narrative-bioethics-committed-to-social-action-and-justice
#4
Camilo Hernán Manchola Castillo, Jan Helge Solbakk
Recently, the involvement of various authors coming from the social sciences and the arts has reinforced the humanistic component of bioethics. Their contributions vary from very theoretical perspectives to rather practical ones. In this paper, Martha Nussbaum's books, The Fragility of Goodness (1986), Love's Knowledge (1990), Cultivating Humanity (1997) and Creating Capabilities (2011) are analysed from the vantage point of narrative bioethics. It is argued that Nussbaum's notions of 'Narrative', 'Imagination' and 'Cultivation' open up the possibility of developing an action-oriented form of narrative bioethics, that is, a bioethics committed to social action and justice...
January 13, 2017: Medical Humanities
https://www.readbyqxmd.com/read/28086893/seasonal-variation-in-geographical-access-to-maternal-health-services-in-regions-of-southern-mozambique
#5
Prestige Tatenda Makanga, Nadine Schuurman, Charfudin Sacoor, Helena Edith Boene, Faustino Vilanculo, Marianne Vidler, Laura Magee, Peter von Dadelszen, Esperança Sevene, Khátia Munguambe, Tabassum Firoz
BACKGROUND: Geographic proximity to health facilities is a known determinant of access to maternal care. Methods of quantifying geographical access to care have largely ignored the impact of precipitation and flooding. Further, travel has largely been imagined as unimodal where one transport mode is used for entire journeys to seek care. This study proposes a new approach for modeling potential spatio-temporal access by evaluating the impact of precipitation and floods on access to maternal health services using multiple transport modes, in southern Mozambique...
January 13, 2017: International Journal of Health Geographics
https://www.readbyqxmd.com/read/28081495/emotional-intensity-in-episodic-autobiographical-memory-and-counterfactual-thinking
#6
Matthew L Stanley, Natasha Parikh, Gregory W Stewart, Felipe De Brigard
Episodic counterfactual thoughts-imagined alternative ways in which personal past events might have occurred-are frequently accompanied by intense emotions. Here, participants recollected positive and negative autobiographical memories and then generated better and worse episodic counterfactual events from those memories. Our results suggest that the projected emotional intensity during the simulated remembered/imagined event is significantly higher than but typically positively related to the emotional intensity while remembering/imagining the event...
January 9, 2017: Consciousness and Cognition
https://www.readbyqxmd.com/read/28080083/the-empathy-impulse-a-multinomial-model-of-intentional-and-unintentional-empathy-for-pain
#7
C Daryl Cameron, Victoria L Spring, Andrew R Todd
Empathy for pain is often described as automatic. Here, we used implicit measurement and multinomial modeling to formally quantify unintentional empathy for pain: empathy that occurs despite intentions to the contrary. We developed the pain identification task (PIT), a sequential priming task wherein participants judge the painfulness of target experiences while trying to avoid the influence of prime experiences. Using multinomial modeling, we distinguished 3 component processes underlying PIT performance: empathy toward target stimuli (Intentional Empathy), empathy toward prime stimuli (Unintentional Empathy), and bias to judge target stimuli as painful (Response Bias)...
January 12, 2017: Emotion
https://www.readbyqxmd.com/read/28079365/twist-and-shout-single-molecule-mechanochemistry
#8
Hongbin Li, Gilbert C Walker
Chemical reactions can be accelerated by various means, including applied mechanical forces. If the direction of the force does not project well onto the desired reaction coordinate, then only poor acceleration is achieved. Recent developments in single polymer mechanics illustrate how to overcome this limitation, in a simple cis-trans isomerization reaction. Generalizing the approach, synthetic chemistry can be used to attach tethers to different parts of reacting molecular fragments to direct the force usefully...
January 12, 2017: ACS Nano
https://www.readbyqxmd.com/read/28078211/a-case-series-of-the-safety-and-efficacy-of-testosterone-replacement-therapy-in-renal-failure-and-kidney-transplant-patients
#9
Ahmad Majzoub, Daniel A Shoskes
BACKGROUND: Hypogonadism is common in patients with renal dysfunction and does not always correct following transplantation. Recent studies show increased mortality for dialysis and transplant patients with low testosterone (T). These patients are often not treated due to concerns over efficacy and complications (both real and imagined). There is surprisingly scant literature supporting the use of T therapy in these patients. We wished to examine the results of T therapy in our patients with renal failure or following transplant...
December 2016: Translational Andrology and Urology
https://www.readbyqxmd.com/read/28077156/interventions-following-a-high-violence-risk-assessment-score-a-naturalistic-study-on-a-finnish-psychiatric-admission-ward
#10
Jenni Kaunomäki, Markus Jokela, Raija Kontio, Tero Laiho, Eila Sailas, Nina Lindberg
BACKGROUND: Patient aggression and violence against staff members and other patients are common concerns in psychiatric units. Many structured clinical risk assessment tools have recently been developed. Despite their superiority to unaided clinical judgments, staff has shown ambivalent views towards them. A constant worry of staff is that the results of risk assessments would not be used. The aims of the present study were to investigate what were the interventions applied by the staff of a psychiatric admission ward after a high risk patient had been identified, how frequently these interventions were used and how effective they were...
January 11, 2017: BMC Health Services Research
https://www.readbyqxmd.com/read/28074850/juvenile-hormone-biosynthesis-in-adult-blattella-germanica-requires-nuclear-receptors-seven-up-and-ftz-f1
#11
Ferran Borras-Castells, Claudia Nieva, José L Maestro, Oscar Maestro, Xavier Belles, David Martín
In insects, the transition from juvenile development to the adult stage is controlled by juvenile hormone (JH) synthesized from the corpora allata (CA) glands. Whereas a JH-free period during the last juvenile instar triggers metamorphosis and the end of the growth period, the reappearance of this hormone after the imaginal molt marks the onset of reproductive adulthood. Despite the importance of such transition, the regulatory mechanism that controls it remains mostly unknown. Here, using the hemimetabolous insect Blattella germanica, we show that nuclear hormone receptors Seven-up-B (BgSvp-B) and Fushi tarazu-factor 1 (BgFTZ-F1) have essential roles in the tissue- and stage-specific activation of adult CA JH-biosynthetic activity...
January 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28074575/the-aca-from-behind-the-veil-of-ignorance
#12
Susan Dentzer
John Rawls posited that we could determine the nature of justice if we imagined ourselves observing conditions in society from behind a hypothetical "veil of ignorance." Not knowing how or where we would end up-rich, poor, empowered, disabled-we would choose governing principles that did not leave one disadvantaged because of his or her circumstances. Rawls's concepts are implicitly embedded in the Affordable Care Act, which guarantees that vastly more Americans can obtain health insurance. The law effectively closed down the de facto lottery that awarded coverage to most but left out millions of others...
January 2017: Hastings Center Report
https://www.readbyqxmd.com/read/28072803/neural-correlates-of-maladaptive-pain-behavior-in-chronic-neck-pain-a-single-case-control-fmri-study
#13
Konstantin Beinert, Audrey Mouthon, Martin Keller, Michael Mouthon, Jean-Marie Annoni, Wolfgang Taube
Chronic neck pain patients display functional impairments like decreased range of motion, decreased strength, and reduced sensorimotor function. In patients without structural damage, the reason for the persistence of pain is not well understood. Therefore, it is assumed that in chronic pain states, memory processes play an important role. We have now detected and tested a patient that might help us to better understand the neural correlates of maladaptive pain expectation/memory. This patient displays chronic neck pain and restricted unilateral motion of the cervical spine to the left...
January 2017: Pain Physician
https://www.readbyqxmd.com/read/28071707/the-content-of-imagined-sounds-changes-visual-motion-perception-in-the-cross-bounce-illusion
#14
Christopher C Berger, H Henrik Ehrsson
Can what we imagine hearing change what we see? Whether imagined sensory stimuli are integrated with external sensory stimuli to shape our perception of the world has only recently begun to come under scrutiny. Here, we made use of the cross-bounce illusion in which an auditory stimulus presented at the moment two passing objects meet promotes the perception that the objects bounce off rather than cross by one another to examine whether the content of imagined sound changes visual motion perception in a manner that is consistent with multisensory integration...
January 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28068129/imagining-the-future-perspectives-among-youth-and-caregivers-in-the-trans-youth-family-study
#15
Sabra L Katz-Wise, Stephanie L Budge, Joe J Orovecz, Bradford Nguyen, Brett Nava-Coulter, Katharine Thomson
Future perspectives of transgender youth and their caregivers may be shaped by knowledge of discrimination and adverse mental health among transgender adults. Qualitative data from the Trans Youth Family Study were analyzed to examine how transgender and gender nonconforming (TGN) youth and their caregivers imagine the youth's future. A community-based sample of 16 families (16 TGN youth, ages 7-18 years, and 29 caregivers) was recruited from 2 regions in the United States. Participants completed in-person qualitative interviews and surveys...
January 2017: Journal of Counseling Psychology
https://www.readbyqxmd.com/read/28066017/madness-and-sanity-at-the-time-of-indian-independence
#16
Sanjeev Jain, Pratima Murthy, Alok Sarin
The backdrop of the Indian Independence offers glimpses of many 'metaphors of madness'. In this article, we explore this through a few instances, starting from 1857, around the time of the First War of Independence, to 1947, when India became an independent nation. Such metaphors have their parallels both in historical as well as in contemporary times, where instances of one man's imagination becoming another's concept of irrationality and insanity continue.
July 2016: Indian Journal of Psychiatry
https://www.readbyqxmd.com/read/28065655/precision-optogenetic-tool-for-selective-single-and-multiple-cell-ablation-in-a-live-animal-model-system
#17
Kalpana Makhijani, Tsz-Leung To, Rubén Ruiz-González, Céline Lafaye, Antoine Royant, Xiaokun Shu
Cell ablation is a strategy to study cell lineage and function during development. Optogenetic methods are an important cell-ablation approach, and we have previously developed a mini singlet oxygen generator (miniSOG) tool that works in the living Caenorhabditis elegans. Here, we use directed evolution to generate miniSOG2, an improved tool for cell ablation via photogenerated reactive oxygen species. We apply miniSOG2 to a far more complex model animal system, Drosophila melanogaster, and demonstrate that it can be used to kill a single neuron in a Drosophila larva...
December 28, 2016: Cell Chemical Biology
https://www.readbyqxmd.com/read/28064681/forget-about-the-future-effects-of-thought-suppression-on-memory-for-imaginary-emotional-episodes
#18
Nathan A Ryckman, Donna Rose Addis, Andrew J Latham, Anthony J Lambert
Whether intentional suppression of an unpleasant or unwanted memory reduces the ability to recall that memory subsequently is a contested issue in contemporary memory research. Building on findings that similar processes are recruited when individuals remember the past and imagine the future, we measured the effects of thought suppression on memory for imagined future scenarios. Thought suppression reduced the ability to recall emotionally negative scenarios, but not those that were emotionally positive. This finding suggests that intentionally avoiding thoughts about emotionally negative episodes may inhibit representations of those memories, progressively reducing their availability to recall...
January 9, 2017: Cognition & Emotion
https://www.readbyqxmd.com/read/28060393/comparing-parafoveal-cone-photoreceptor-mosaic-metrics-in-younger-and-older-age-groups-using-an-adaptive-optics-retinal-camera
#19
Julie Jacob, Michel Paques, Valérie Krivosic, Bénédicte Dupas, Ali Erginay, Ramin Tadayoni, Alain Gaudric
BACKGROUND AND OBJECTIVE: To analyze cone mosaic metrics on adaptive optics (AO) images as a function of retinal eccentricity in two different age groups using a commercial flood illumination AO device. PATIENTS AND METHODS: Fifty-three eyes of 28 healthy subjects divided into two age groups were imaged using an AO flood-illumination camera (rtx1; Imagine Eyes, Orsay, France). A 16° × 4° field was obtained horizontally. Cone-packing metrics were determined in five neighboring 50 µm × 50 µm regions...
January 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28060146/combined-effect-of-ocular-and-multifocal-contact-lens-induced-aberrations-on-visual-performance-center-distance-versus-center-near-design
#20
Daniela Lopes-Ferreira, Paulo Fernandes, António Queirós, José M González-Meijome
PURPOSE: To evaluate the combined effects of inherent ocular aberrations and induced aberrations with a multifocal soft contact lens (MFCL) after 15 days of lens wear in presbyopic participants and their influence on visual performance at distance and near under high and low contrast conditions. METHODS: Forty presbyopic participants (mean age, 48.7±3.4) presenting a mean addition of 1.53±0.58 D were fitted with Biofinity Multifocal (CooperVision) and included in the study...
January 4, 2017: Eye & Contact Lens
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