Miracle-dz/UniFAR-FTUs huggingface dataset:
A Study of the Perceptions of Black Administrators Concerning the Role of the Black Principal in Florida During the Period 1973-78.

The purpose of this study was to investigate how Black administrators perceive the role of the Black principal in Florida. It was felt that such information would contribute to the development of positive concepts of Black educators and students as well as give insight to the reason for the exodus of Black high school principals from the state of Florida. It was reported by Porter (1) that Black high school principals in Florida were reduced from 103 to 13 during the period 1965-71. In addition to the principals, the population for this study included assistant superintendents, supervisors, directors, assistant principals, and deans in the Florida public education system, but only in how they perceived the role of the Black principal. A questionnaire was developed to seek answers to the following questions: 1. What are the beliefs of Black administrators as to their roles during the period from 1973 to 1978? 2. What do Black administrators see as significant barriers, other than financial, which prohibit them from organizing and operating the kinds of schools they want? 3. In what ways do Black administrators believe county staff can be of more assistance in operating a more effective school for students? 4. How do Black administrators believe their talents can be better utilized in a school or in the educational system? 5. Do Black administrators believe that young Blacks should prepare themselves academically to become school principals?
Functional Neuroimaging—Can It Contribute to Our Understanding of Processes of Change?

Preliminary studies have shown that psychotherapeutic and pharmacological treatments of psychiatric disorders lead to measurable changes in the activity of the brain, particularly when they successfully reduce depression, fears, or obsessions. The purpose of this paper is to review the potential of functional neuroimaging in the understanding and evaluation of psychotherapy. Following an overview of basic neuroimaging concepts and procedures, promising neuroimaging paradigms probing mind–brain function are presented together with selected results on psychiatric patients and control subjects. Neuroimaging studies conducted pre- and post-psychotherapy are reviewed. Conclusions are formulated regarding an interdisciplinary dialogue between psychoanalysts and neuroscientists. Most likely, modulations of connections within the limbic system by higher cortical (prefrontal) networks are instrumental in the changes depicted in various studies. Overall, current developments open new avenues for bridging the gap between psychodynamic and biological psychiatry. Based on the studies presented and the emerging plasticity of the brain, the distinction between somatic treatments having an impact on the brain and psychological treatments with more elusive subjective effects has become obsolete. It must be assumed that psychoanalysis also has a measurable impact on brain functioning, insofar as it successfully ameliorates symptoms, changes relationship patterns, or increases mentalizing abilities.
Rad51 Polymerization Reveals a New Chromatin Remodeling Mechanism

Rad51 protein is a well known protagonist of homologous recombination in eukaryotic cells. Rad51 polymerization on single-stranded DNA and its role in presynaptic filament formation have been extensively documented. Rad51 polymerizes also on double-stranded DNA but the significance of this filament formation remains unclear. We explored the behavior of Saccharomyces cerevisiae Rad51 on dsDNA and the influence of nucleosomes on Rad51 polymerization mechanism to investigate its putative role in chromatin accessibility to recombination machinery. We combined biochemical approaches, transmission electron microscopy (TEM) and atomic force microscopy (AFM) for analysis of the effects of the Rad51 filament on chromatinized templates. Quantitative analyses clearly demonstrated the occurrence of chromatin remodeling during nucleoprotein filament formation. During Rad51 polymerization, recombinase proteins moved all the nucleosomal arrays in front of the progressing filament. This polymerization process had a powerful remodeling effect, as Rad51 destabilized the nucleosomes along considerable stretches of DNA. Similar behavior was observed with RecA. Thus, recombinase polymerization is a powerful mechanism of chromatin remodeling. These remarkable features open up new possibilities for understanding DNA recombination and reveal new types of ATP-dependent chromatin dynamics.
Les usages de drogues illicites déclarés par les adolescents selon le mode de collecte

Вес к Francois, Pfretti- Watfl Patrick - El uso de drogas ilegales declarado рог los adolescentes segun el metodo de colecta Las encuestas que pretender estimar el nivel de uso de drogas ilegales entre los adolescentes dan resultados contrastados segun el metodo de colecta Este articulo compara dos encuestas basadas en metodos de colecta de datos distintos cuestionano auto-admimstrado en medms escolares y entrevista рог telefono en el domicilio Los niveles de uso durante el afio obtenidos utih/ando el primer metodo son sistematicamente supenores Las diterenuas, que se anali/an para el caso de consumo de cannabis, no parecen deberse a efectos de seleccion Si se anali/an exclusivamente los estudiantes de secundana, las diferenuas por edad y sexo persisten La existencia de diferencias similares en las respuestas a otras preguntas sensibles (absentismo, uso de tabaco ocasional, ideas suicidas) ponen el metodo de colecta en cuestion Un modelo logistico permite evaluar el efecto del metodo, una vez se han tornado en cuenta varios indicadores souo-demograficos y escolares en relacion a la entrevista рог teletono, el cuestionano auto-admimstrado en medios escolares multiplica por 1,7 las probabilidades de declarar consumo de cannabis durante el aňo de la entrevista No obstante, hana talta con- trolar un posible "efecto de grupo" para este ultimo metodo de colecta.
Leveraging Social Networks for Online Identity Verification

PROBLEM INTRODUCTION Online communities face increasing pressure to limit harmful contact between adults and minors. The National Center for Missing and Exploited Children found tha t 13% of all children online received sexual solicitations. In a onethird of such cases, the solicitor attempted to mee t the child offline. Furthermore, 4% of children online were as ked for nude pictures of themselves [1]. Recognizing this p roblem, forty-nine of the fifty US State Attorney Generals have signed an agreement with online social networks to work together to find a solution for protecting children o line. Also, the Federal Trade Commission is monitoring th e situation as an extension of its existing role prev enting children from accessing adult-oriented websites.
Aural key identification and its relationship to absolute pitch.

The ability of musically talented and trained subjects (124 non- absolutepitch- possessors, 11 AP possessors), was tested to determine whether or not brief musical stimuli were in the nominal (i. e., correct) key; no pitch reference was given. As test stimuli, excerpts of J. S. Bach9s major preludes of the Well- Tempered Clavier, Vol. 1 (duration 4- 5 sec), were employed. Three categories of test were carried out, i. e. , pilot, main, and control experiments. In the pilot and main experiments, test stimuli were generated on a piano, while in the control experiments modified piano sounds and electronic sounds were used. The pilot experiments yielded good replicability of previous findings (Terhardt & Ward, 1982), and showed insensitivity of key- identification performance to the type of experimental paradigm employed. In the main experiment, 78% of the subjects (only 11 being AP possessors) achieved significant identification performance with transpositions of up to 4 semitones. Forty-five percent of subjects were significantly able to tell the nominal key from ± 1-semitone transpositions. The distribution of identification rates (normalized for guessing) extends from 0 to 100% and shows a pronounced minimum at around 75%. This suggests two different modes of key identification, one used by non-AP-possessors, and the other by AP possessors. The control experiments reveal that key- identification performance is not piano-specific. Results of all three test categories indicate that no perceptual cues other than pitch were involved. It is thus concluded that both AP possessors and non-AP-possessors depend on absolute pitch information when identifying musical key; however, they employ different perceptual modes: AP possessors primarily identify individual notes, while non-AP-possessors unconsciously deduce from a series of notes a feeling of key.
On Transition Minimality of Bideterministic Automata

Bideterministic automata are deterministic automata with the property of their reversal automata also being deterministic. Bideterministic automata have previously been shown to be unique (up to an isomorphism) minimal NFAs with respect to the number of states. In this paper, we show that in addition to state minimality, bideterministic automata are also transition-minimal NFAs. However, as this transition minimality is not necessarily unique, we also present the necessary and sufficient conditions for a bideterministic automaton to be uniquely transition-minimal among NFAs. Furthermore, we show that bideterministic automata are transition-minimal ∈-NFAs.
Demonstrating the effect of context on order effects for an army air defense task using the patriot simulator

The results reported herein support the hypotheses that (1) situation-specific, contextual features of a task can cause people to use explanation-based reasoning (Pennington and Hastie, 1993); (2) such reasoning can cause experienced personnel, both individually and in two-person teams, to reinterpret the meaning of the same information when it is presented in two different ordered sequences; and (3) the result will be primacy or recency (or no) effects depending on whether the most recent conflicting information can be explained away or not, respectively. These results extend the belief-adjustment model proposed by Hogarth and Einhorn (1992), which does not address information reinterpretations, and always predicts recency effects for an evaluation task with a short series of conflicting information. More generally, the results demonstrate the importance of situation-specific, contextual features in understanding judgment processes. © 1997 John Wiley & Sons, Ltd.
Enhanced teleoperation of UAVs with haptic feedback

This paper proposes a new intuitive technique for the haptic teleoperation of unmanned aerial vehicles (UAVs). The UAV is controlled using joystick's velocity commands, and the haptic feedback is a repelling force proportional to the UAV's velocity. Our proposed method that entails sensing the UAV velocity and commanding it using velocity based gestures proved to be an easier and more intuitive method for flying UAVs and accordingly, resulted in enhanced performance. Moreover, in this paper we provide a thorough investigation of the different modes to teleoperate UAVs and we demonstrate how using the velocity commands can be more intuitive and natural.
Telomere Length Attrition, a Marker of Biological Senescence, Is Inversely Correlated with Triglycerides and Cholesterol in South Asian Males with Type 2 Diabetes Mellitus

South Asians have a higher risk of type 2 diabetes mellitus (T2DM) and cardiovascular disease (CVD) than white Caucasians, for a given BMI. Premature biological ageing, assessed by reduction in telomere length (TL), may be mediated by factors resulting from altered metabolic profiles associated with obesity. We hypothesise that ethnicity and metabolic status represent detrimental factors contributing to premature biological ageing. Therefore we assessed TL in two South Asian, age and BMI-matched cohorts [T2DM (n = 142) versus non-T2DM (n = 76)] to determine the effects of BMI, gender, lipid and CVD profile on biological ageing. Genomic DNA was obtained from the UKADS cohort; biochemical and anthropometric data was collected and TL was measured by quantitative real-time PCR. Our findings indicated a gender-specific effect with reduced TL in T2DM men compared with non-T2DM men (P = 0.006). Additionally, in T2DM men, TL was inversely correlated with triglycerides and total cholesterol (r = −0.419, P < 0.01; r = −0.443, P < 0.01). In summary, TL was reduced amongst South Asian T2DM men and correlated with triglycerides and total cholesterol. This study highlights enhanced biological ageing among South Asian, T2DM men, which appears to be tracked by changes in lipids and BMI, suggesting that raised lipids and BMI may directly contribute to premature ageing.
Adverse effects of soluble non-starch polysaccharide (guar gum) on piglet growth and experimental colibacillosis immediately after weaning.

This study evaluated the effects of adding soluble fibre to the diet of healthy weaner pigs and weaner pigs experimentally infected with enterotoxigenic Escherichia coli (ETEC) in a model of post-weaning colibacillosis. Bodyweight gain, intestinal changes and proliferation of ETEC were measured 7 days following weaning. The basal diet consisted of pregelatinised rice fortified with animal protein. Addition of guar gum to this diet elevated the soluble fibre content from 1 to 6 per cent, and was associated with reduced bodyweight gains, increased large intestinal weights and fermentation, and increased proliferation of ETEC in the small intestine. The optimal levels and type of dietary fibre used for weaner pig diets require further evaluation.
Mechanisms of Postprandial Hyperlipidaemia—Remnants and Coronary Artery Disease

High plasma concentrations of triglyceride‐rich lipoprotein are associated with an increased risk of coronary artery disease (CAD). In the postprandial state, there is a large increase in chylomicron and very low‐density lipoprotein (VLDL) concentrations. The accumulation of potentially atherogenic particles is controlled by the balance of their synthesis and clearance. Chylomicrons are rich in triglyceride and secreted by the intestine postprandially. Chylomicrons compete with VLDL for hydrolysis by lipoprotein lipase (LPL). This competition may cause the increase in large plasma concentration of VLDL seen in the postprandial state. Postprandial increases in atherogenic plasma lipoprotein concentrations are accentuated in insulin‐resistant states. Insulin resistance is associated with greater flux of free fatty acids, which may in turn lead to enhanced synthesis of VLDL. Alimentary lipidaemia has been shown to effect changes in the coagulation cascade which may provide additional connections between postprandial lipaemia and CAD. Thus, specific postprandial changes in plasma lipids may be indicative of atherogenic risk. Measurement of postprandial plasma triglyceride concentration and the apo B‐48 and apo B‐100 contents in triglyceride‐rich lipoprotein fractions are probably useful indicators of postprandial dyslipidaemia, but prospective studies of how these lipid variables relate to CAD progression are needed. © 1997 John Wiley & Sons, Ltd.
Characterization and Surgical Ablation of Acute Atrial Flutter Following the Mustard Procedure A Canine Model

BackgroundA high incidence of refractory atrial flutter has been reported as a late postoperative complication of the Mustard procedure. The objective of this study was to reproduce experimentally the long-cycle-length atrial flutter that occurs in these patients and attempt to ablate the arrhythmia surgically. Methods and ResultsNine dogs underwent a simulated Mustard procedure, which included a longitudinal right atriotomy, a septectomy, and a continuous suture line placed in the usual baffle location. All animals were subsequently inducible into sustained atrial flutter after surgery. Activationtime electrophysiological maps of the various pathways of atrial reentry were determined using atrial endocardial molds containing 252 bipolar electrodes. Four distinct reentrant circuits were observed in the following locations: (1) around the tricuspid valve annulus (n=5; cycle length, 175±5 milliseconds), (2) around the atriotomy incision (n=2; cycle length, 208±3 milliseconds), (3) in a pathway involving both atria (n=l; cycle length, 180 milliseconds), and (4) around the mitral valve (n=1; cycle length, 135 milliseconds). A common pathway for eight of the nine reentrant circuits included the free-wall segment of the right atrium (excluding the mitral valve circuit). In the first three animals, surgical ablation of the atrial flutter was not attempted, but an incision made perpendicular to the atriotomy down to the tricuspid valve annulus resulted in termination of the atrial flutter in the other six animals. One of these animals was subsequently inducible into an atrial flutter of different morphology (cycle length, 125 milliseconds) that involved an isolated left atrial reentrant circuit. ConclusionsThe Mustard procedure creates several anatomic substrates that increase the probability of the heart to develop atrial flutter, and these may be amenable to subsequent surgical correction.
Attachment, maternal sensitivity, and infant temperament during the first year of life.

Families were examined at 6, 9, and 12 months in an intensive longitudinal study that included Home Behavior Attachment Q-sorts, laboratory Strange Situation assessment, home observations of infant temperament behavior on 24 occasions, observations of maternal parenting sensitivity on 12 occasions, and maternal reports of infant temperament. Maternal sensitivity was modestly related to Q-sort security and unrelated to Strange Situation classification. In contrast, observed infant temperament was more strongly related to both maternal sensitivity and Q-sort security. The relation between home and laboratory assessment of attachment security, which was at the level found in prior work (e.g., B. E. Vaughn & E. Waters, 1990), remained after the effects of observed and mother-reported infant temperament were partialed. Our data highlight the need to consider other factors besides maternal sensitivity in the explanation of variability in the attachment status of 1-year-olds.
Prediction of Crosstalk Involving Twisted Pairs of Wires-Part I: A Transmission-Line Model for Twisted-Wire Pairs

A transmission line model for predicting electromagnetic coupling (crosstalk) involving twisted-wire pairs (TWP) is developed. The twisted pair is modeled as a cascade of loops consisting of uniform two-wire sections with abrupt interchanges of wire positions at the ends of each loop. Experimental results are obtained for the coupling between a single wire above ground and a twisted pair above ground. The experimental correlation with the model predictions indicates that the simulation model is typically accurate within 3 dB for frequencies such that the total line length is less than 1/ 10 of a wavelength. For higher frequencies, the model tracks the experimental results quite well although the prediction error is somewhat larger.
[Pheochromocytoma in 8-year observation at a single endocrinological center in Wroclaw].

INTRODUCTION Pheochromocytoma is rare tumor with a highly variable clinical presentation. This report provides clinical picture, efficiency of diagnostics and treatment of pheochromocytoma in 8-years in the endocrinological center in Wroclaw. MATERIAL AND METHODS The records of 37 patients with pheochromocytoma were identified, who were treated in 2000-2007 in the Department of Endocrinology, Diabetology and Isotope Treatment in Wroclaw. There were 23 women (age 23-75 year) and 14 men (age 17-74). We studied frequency of clinical signs, usefulness of diagnostic methods and efficacy of treatment. RESULTS The duration of the clinical history ranged from 2 months to 16 years. The most frequent symptoms were: hypertension paroxysmal and constant, palpitations, headache, sweating and anxiety. The most sensitive diagnostic method was increased concentration of urinary metanephrine in 24-hour urine. Computed tomography was the most widely used method for tumor localization. Adrenal pheochromocytoma was detecting by CT in all patients, predominated in right adrenal, in 1 case in urinary bladder. Surgery caused remission of hypertension in 59%, improvement in 26.8%, and no changes in 13.9% of patients. Malignancy was reported in 2 cases, 1 woman died after surgery. MEN 2A occur in 21.6%. CONCLUSIONS The diagnosis of pheochromocytma is usually made after long duration of the disease. The study confirms that clinical presentation of pheochromocytoma is variable and nonspecific, this finding makes the diagnosis very difficult. The most typical symptom is paroxysmal hypertension, which is present only in 40%, other symptoms are nonspecific. The measurement of 24-hour urinary metanephrines was the best indicator. CT was almost always successful in localizing the tumor. Patients with pheochromocytoma should be consider for other endocrine diseases especially medullary carcinoma, primary hyperparathyroidism and other component of MEN 2A.
Note on sparsity in signal recovery and in matrix identification

The standard approach to recover a signal with a sparse representation in D is to design a measurement matrix ΦD ∈ Cm×n which allows the recovery of any f ∈ Σk from the measurement vector ΦDf whenever k is sufficiently small. While a minimal requirement for the recovery of any f ∈ Σk is that the constructed map ΦD : Σ D k −→ C, f 7→ ΦDf is injective, the recent literature on sparse signal recovery focuses mainly on numerically robust recovery methods whose application require that ΦD is not only injective but well conditioned on its domain. Note that the Euclidean basis E = {ej} is commonly used as a dictionary. Then N = n and f ∈ Σk if f has at most k nonzero entries.
Type II toxin/antitoxin MqsR/MqsA controls type V toxin/antitoxin GhoT/GhoS.

Toxin endoribonucleases of toxin/antitoxin (TA) systems regulate protein production by selectively degrading mRNAs but have never been shown to control other TA systems. Here we demonstrate that toxin MqsR of the MqsR/MqsA system enriches toxin ghoT mRNA in vivo and in vitro, since this transcript lacks the primary MqsR cleavage site 5'-GCU. GhoT is a membrane toxin that causes the ghost cell phenotype, and is part of a type V TA system with antitoxin GhoS that cleaves specifically ghoT mRNA. Introduction of MqsR primary 5'-GCU cleavage sites into ghoT mRNA reduces ghost cell production and cell death likely due to increased degradation of the altered ghoT mRNA by MqsR. GhoT also prevents cell elongation upon the addition of low levels of ampicillin. Therefore, during stress, antitoxin GhoS mRNA is degraded by toxin MqsR allowing ghoT mRNA translation to yield another free toxin that forms ghost cells and increases persistence. Hence, we show that GhoT/GhoS is the first TA system regulated by another TA system.