The role of sign in students' modeling of scalar equations

We describe students revising the mathematical form of physics equations to match the physical situation they are describing, even though their revision violates physical laws. In an unfamiliar air resistance problem, a majority of students in a sophomore level mechanics class at some point wrote Newton's Second Law as F = -ma; they were using this form to ensure that the sign of the force pointed in a direction consistent with the chosen coordinate system while assuming that some variables have only positive value. We use one student's detailed explanation to suggest that students' issues with variables are context-dependent, and that much of their reasoning is useful for productive instruction.Comment: 5 pages, 1 figure, to be published in The Physics Teache

Post-traumatic stress disorder: the neurobiological impact of psychological trauma

The classic fight-or-flight response to perceived threat is a reflexive nervous phenomenon thai has obvious survival advantages in evolutionary terms. However, the systems that organize the constellation of reflexive survival behaviors following exposure to perceived threat can under some circumstances become dysregulated in the process. Chronic dysregulation of these systems can lead to functional impairment in certain individuals who become “psychologically traumatized” and suffer from post-traumatic stress disorder (PTSD), A body of data accumulated over several decades has demonstrated neurobiological abnormalities in PTSD patients. Some of these findings offer insight into the pathophysiology of PTSD as well as the biological vulnerability of certain populations to develop PTSD, Several pathological features found in PTSD patients overlap with features found in patients with traumatic brain injury paralleling the shared signs and symptoms of these clinical syndromes

Collaboration scripts - a conceptual analysis

This article presents a conceptual analysis of collaboration scripts used in face-to-face and computer-mediated collaborative learning. Collaboration scripts are scaffolds that aim to improve collaboration through structuring the interactive processes between two or more learning partners. Collaboration scripts consist of at least five components: (a) learning objectives, (b) type of activities, (c) sequencing, (d) role distribution, and (e) type of representation. These components serve as a basis for comparing prototypical collaboration script approaches for face-to-face vs. computer-mediated learning. As our analysis reveals, collaboration scripts for face-to-face learning often focus on supporting collaborators in engaging in activities that are specifically related to individual knowledge acquisition. Scripts for computer-mediated collaboration are typically concerned with facilitating communicative-coordinative processes that occur among group members. The two lines of research can be consolidated to facilitate the design of collaboration scripts, which both support participation and coordination, as well as induce learning activities closely related to individual knowledge acquisition and metacognition. In addition, research on collaboration scripts needs to consider the learners’ internal collaboration scripts as a further determinant of collaboration behavior. The article closes with the presentation of a conceptual framework incorporating both external and internal collaboration scripts

Coconut (Cocos nucifera) Inflorescence Sap Nutritional Characteristics and Health Effects

Coconut is widely known as the tree of life. Every part of the tree is useful and therefore, coconut palm is an important economic crop of the local people. Neera is the exudate obtained from the unopened inflorescence of coconut palm (Cocos nucifera). It is healthy and therapeutic drink since it is rich in Vitamin C, has more food calories than milk, fights diabetes, cancer, electrolyte deficiency and even hair fall. Neera is rich in minerals and vitamins and it contains glucamic acid necessary for protein synthesis. It aids in digestion health. Neera contains vitamins (A and C), which have anti - oxidant properties thereby preventing damage or death of cells. Neera contains acids nicotinic acid and riboflavin and also can be consumed by people suffering from diabetes since it has a low glycemic index and a low glycemic load. In the study discuss about chemical composition including total sugar, reducing sugar, ethanol and vitamins

Comparative Study Of Graded Repetitive Arm Supplementary Program (Grasp) Vs Task Specific Training (Tst) On Upper Limb Function In Subacute Stroke Survivors

Study Design: Comparative study Design Methods. Aim and Objectives: The aim of the study was to find out the comparison between GRASP and TST on Upper Extremity functions of subacute stroke survivors Participants: 30 subjects were chosen based on inclusion and exclusion criteria by using convenient sampling method. They were divided into 3 groups of 10 each for respective groups. Methods: Fugl Mayer Assessment (FMA) was administrated to all the subjects to evaluate the pre-test value. Each group received their respective intervention for 8 weeks, 5 sessions per week. After the intervention, the post-test was conducted for all the three groups by the administration of Fugl Mayer Assessment (FMA). Graph pad InStat was used to analyze the data. Result: Statistical analysis shows that there was a significant difference on Upper Extremity Functions of persons with subacute stroke in both Experimental groups (A) and (B) as well as Control group (C). comparing mean obtained on posttest in the experimental groups (A, B) and control group (C) using, Fugl Mayer Assessment (FMA) 43.1, 42.4 and 37.3 respectively; it is seen that mean obtained in GRASP is higher than the TST and the least are obtained in Conventional OT on Fugl Mayer Assessment (FMA). Conclusion: This study concludes that Graded Repetitive Arm Supplementary Program (GRASP) and Task Specific Training (TST) combined with Conventional Occupational Therapy improve Upper Extremity Functions of persons with subacute stroke

Bariatric surgery: trends in utilization, complications, conversions and revisions

Background Sleeve gastrectomy (SG) increased in popularity after 2010 but recent data suggest it has concerning rates of gastroesophageal reflux and need for conversions. This study aims to evaluate recent trends in the utilization of bariatric procedures, associated complications, and conversions using an administrative claims database in the United States. Methods We included adults who had bariatric procedures from 2000 to 2020 with continuous enrollment for at least 6 months in the MarketScan Commercial Claims and Encounters database. Index bariatric procedures and subsequent revisions or conversions were identified using CPT codes. Baseline comorbidities and postoperative complications were identified with ICD-9-CM and ICD-10 codes. Cumulative incidences of complications were estimated at 30-days, 6-months, and 1-year and compared with stabilized inverse probability of treatment weighted Kaplan–Meier analysis. Results We identified 349,411 bariatric procedures and 5521 conversions or revisions. The sampled SG volume appeared to begin declining in 2018 while Roux-en-Y gastric bypass (RYGB) remained steady. Compared to RYGB, SG was associated with lower 1-year incidence [aHR, (95% CIs)] for 30-days readmission [0.65, (0.64–0.68)], dehydration [0.75, (0.73–0.78)], nausea or vomiting [0.70, (0.69–0.72)], dysphagia [0.55, (0.53–0.57)], and gastrointestinal hemorrhage [0.43, (0.40–0.46)]. Compared to RYGB, SG was associated with higher 1-year incidence [aHR, (95% CIs)] of esophagogastroduodenoscopy [1.13, (1.11–1.15)], heartburn [1.38, (1.28–1.49)], gastritis [4.28, (4.14–4.44)], portal vein thrombosis [3.93, (2.82–5.48)], and hernias of all types [1.36, (1.34–1.39)]. There were more conversions from SG to RYGB than re-sleeving procedures. SG had a significantly lower 1-year incidence of other non-revisional surgical interventions when compared to RYGB. Conclusions The overall volume of bariatric procedures within the claims database appeared to be declining over the last 10 years. The decreasing proportion of SG and the increasing proportion of RYGB suggest the specific complications of SG may be driving this trend. Clearly, RYGB should remain an important tool in the bariatric surgeon’s armamentarium

Scanpath analysis of expertise and culture in teacher gaze in real-world classrooms

Humans are born to learn by understanding where adults look. This is likely to extend into the classroom, making teacher gaze an important topic for study. Expert teacher gaze has mainly been investigated in the laboratory, and has focused mostly on one cognitive process: teacher attentional (i.e., information-seeking) gaze. No known research has made direct cultural comparisons of teacher gaze or successfully found expert–novice differences outside Western settings. Accordingly, we conducted a real-world study of expert teacher gaze across two cultural settings, exploring communicative (i.e., information-giving) as well as attentional gaze. Forty secondary school teachers wore eye-tracking glasses, with 20 teachers (10 expert; 10 novice) from the UK and 20 teachers (10 expert; 10 novice) from Hong Kong. We used a novel eye-tracking scanpath analysis to ascertain the importance of expertise and culture, individually and as a combination. Attentional teacher scanpaths were significantly more similar within than across expertise and expertise + culture sub-groups; communicative scanpaths were significantly more similar within than across expertise and culture. Detailed analysis suggests that (1) expert teachers refer back to students constantly through focused gaze during both attentional and communicative gaze and that (2) expert teachers in Hong Kong scan students more than experts do in the UK

Nefroblastom u kuje - prikaz slučaja.

A nine year old, intact female German shepherd dog was presented with the complaint of melena. The dog was anorectic, lethargic and cachectic. Physical examination and radiography revealed the presence of a large mid-dorsal intra-abdominal mass. Laboratory findings and diagnostic ultrasound marked the suspicious involvement of the right kidney. Renal neoplasm was suspected and an exploratory celiotomy was done. The mass was spread over the sublumbar region and was found to have originated from the right kidney. Excision of the tumor mass, along with unilateral nephrectomy, was done and the surgical recovery was uneventful. Histopathological examination led to the diagnosis of stage ΙΙΙ renal nephroblastoma with unfavorable histology. The potential clinical and pathological manifestations of canine renal nephroblastoma in an adult dog have been documented.Opisan je nefroblastom devetogodišnje njemačke ovčarke s melenom. Kuja je bila anoreksična, letargična i kahektična. Fizikalnom pretragom i radiografijom u kuje je ustanovljena velika masa u srednjem dorzalnom dijelu trbuha. Laboratorijskom i ultrazvučnom pretragom ustanovljene su promjene na desnom bubregu. Postavljena je sumnja na pojavu novotvorine na bubregu te je učinjena dijagnostička celiotomija. Masa se proširila na podslabinsko područje, a potjecala je od desnog bubrega. Tumorska masa bila je uklonjena kirurški s unilateralnom nefrektomijom. Patohistološkom pretragom postavljena je dijagnoza nefroblastoma III. stupnja s nepovoljnim histološkim nalazom. U radu je opisano kliničko i patološko očitivanje nefroblastoma u odrasle kuje

Circuit-based interrogation of sleep control.

Sleep is a fundamental biological process observed widely in the animal kingdom, but the neural circuits generating sleep remain poorly understood. Understanding the brain mechanisms controlling sleep requires the identification of key neurons in the control circuits and mapping of their synaptic connections. Technical innovations over the past decade have greatly facilitated dissection of the sleep circuits. This has set the stage for understanding how a variety of environmental and physiological factors influence sleep. The ability to initiate and terminate sleep on command will also help us to elucidate its functions within and beyond the brain