Detecting Organization-Targeted Socialbots by Monitoring Social Network Profiles

Networks and Spatial Economics - Advanced attackers use online social networks in order to extract useful information about targeted organizations, including the names of the organization’s...     

Effects of expert and referent influence, physical attractiveness, and gender on perceptions of counselor attributes.

Investigated the predictions of social influence theory with respect to Ss' perceptions of counselors' professional and personal attributes and Ss' evaluations of the counselors. Expert and referent power bases and influence attempts were crossed with levels of counselor physical attractiveness together with S and counselor gender in a counseling analog. 64 male and 64 female undergraduates viewed 1 of 8 videotaped simulated counseling interviews and completed rating forms assessing their perceptions and evaluations. Analyses supported social influence theory in that (a) expert conditions produced higher ratings of professional attributes than did referent conditions, (b) referent conditions produced higher ratings of personal attributes than did expert conditions, (c) congruent conditions (power base and influence attempt) produced higher ratings than did incongruent conditions on all measures, and (d) physical attractiveness mediated the effects of congruence for personal but not for professional attributes. No gender differences were present. Implications for the social influence process are discussed. (26 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Nitric Oxide: Perspectives and Emerging Studies of a Well Known Cytotoxin

The free radical nitric oxide (NO^•) is known to play a dual role in human physiology and pathophysiology. At low levels, NO^• can protect cells; however, at higher levels, NO^• is a known cytotoxin, having been implicated in tumor angiogenesis and progression. While the majority of research devoted to understanding the role of NO^• in cancer has to date been tissue-specific, we herein review underlying commonalities of NO^• which may well exist among tumors arising from a variety of different sites. We also discuss the role of NO^• in human physiology and pathophysiology, including the very important relationship between NO^• and the glutathione-transferases, a class of protective enzymes involved in cellular protection. The emerging role of NO^• in three main areas of epigenetics—DNA methylation, microRNAs, and histone modifications—is then discussed. Finally, we describe the recent development of a model cell line system in which human tumor cell lines were adapted to high NO^• (HNO) levels. We anticipate that these HNO cell lines will serve as a useful tool in the ongoing efforts to better understand the role of NO^• in cancer.     

Tympanometric detection of middle ear effusion in infants and young children

Tympanometry, a test of middle ear status new to clinical pediatrics, was carried out on 280 subjects, 10 days through 5 years of age. The tympanograms obtained were compared with otoscopic findings and, in 107 of the subjects, with findings at myringotomy. Seven distinct tympanometric curve types were identified and defined, based on their degree of correlation with the presence or absence of middle ear effusion. In subjects 7 months of age and older, curves suggesting normal (high) tympanic membrane compliance in combination with atmospheric or near-atmospheric middle ear air pressure were rarely associated with effusion. Conversely, curves suggesting low tympanic membrane compliance were highly correlated with the presence of effusion. Curves suggesting intermediate compliance or reduced middle ear air pressure were also correlated with effusion, but the degree of correlation was dependent on the shape of the curve. In infants less than 7 months of age, many of the ears with effusion had "normal" tympanograms, presumably because external auditory canal walls in such infants tend to be highly distensible. Tympanometry is a simple, rapid, atraumatic, valid, and objective test, easily administered by paraprofessional personnel. Its use can result in improved detection of middle ear effusion and other middle ear abnormalities, and also appears to promote improvement in diagnostic acumen.     

Effects of metaphors and cognitive complexity on perceived counselor characteristics.

Compared the effects of 3 types of counselor-offered metaphors, varying in levels of complexity, to facilitative responses on tests of perceived empathy, regard, expertness, attractiveness, and trustworthiness. Cognitive complexity was measured with the Paragraph Completion Method, the Intolerance of Ambiguity Scale, and the Intolerance of Trait Inconsistency Scale. Empathy and level of regard were assessed by the Barrett-Leonard Relationship Inventory; perceived counselor expertness, attractiveness, and trustworthiness were measured by the Counselor Rating Form—Short Version. 80 undergraduates, crossed on levels of cognitive complexity, were assigned to 1 of 4 audiotaped treatment conditions: complex metaphor (CM), narrative analogy (NA), cliché (CL), and Level 3 facilitative response (L3). Results indicate that NA and L3 each produced more positive client ratings of empathy, regard, and expertness than CL. Cognitive complexity did not affect client ratings except for CM conditions. (19 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

MISR stereoscopic image matchers: techniques and results

The Multi-angle Imaging SpectroRadiometer (MISR) instrument, launched in December 1999 on the NASA EOS Terra satellite, produces images in the red band at 275-m resolution, over a swath width of 360 km, for the nine camera angles 70.5/spl deg/, 60/spl deg/, 45.6/spl deg/, and 26.1/spl deg/ forward, nadir, and 26.1/spl deg/, 45.6/spl deg/, 60/spl deg/, and 70.5/spl deg/ aft. A set of accurate and fast algorithms was developed for automated stereo matching of cloud features to obtain cloud-top height and motion over the nominal six-year lifetime of the mission. Accuracy and speed requirements necessitated the use of a combination of area-based and feature-based stereo-matchers with only pixel-level acuity. Feature-based techniques are used for cloud motion retrieval with the off-nadir MISR camera views, and the motion is then used to provide a correction to the disparities used to measure cloud-top heights which are derived from the innermost three cameras. Intercomparison with a previously developed "superstereo" matcher shows that the results are very comparable in accuracy with much greater coverage and at ten times the speed. Intercomparison of feature-based and area-based techniques shows that the feature-based techniques are comparable in accuracy at a factor of eight times the speed. An assessment of the accuracy of the area-based matcher for cloud-free scenes demonstrates the accuracy and completeness of the stereo-matcher. This trade-off has resulted in the loss of a reliable quality metric to predict accuracy and a slightly high blunder rate. Examples are shown of the application of the MISR stereo-matchers on several difficult scenes which demonstrate the efficacy of the matching approach.     

An extracellular factor regulating expression of the chromosomal aminoglycoside 2'-N-acetyltransferase of Providencia stuartii

The chromosomal aac(2')-Ia gene in Providencia stuartii encodes a housekeeping 2'-N-acetyltransferase [AAC(2')-Ia] involved in the acetylation of peptidoglycan. In addition, the AAC(2')-Ia enzyme also acetylates and confers resistance to the clinically important aminoglycoside antibiotics gentamicin, tobramycin, and netilmicin. Expression of the aac(2')-Ia gene was found to be strongly influenced by cell density, with a sharp decrease in aac(2')-Ia mRNA accumulation as cells approached stationary phase. This decrease was mediated by the accumulation of an extracellular factor, designated AR (for acetyltransferase repressing)-factor. AR-factor was produced in both minimal and rich media and acted in a manner that was strongly dose dependent. The activity of AR-factor was also pH dependent, with optimal activity at pH 8.0 and above. Biochemical characterization of conditioned media from P. stuartii has shown that AR-factor is between 500 and 1,000 Da in molecular size and is heat stable. In addition, AR-factor was inactivated by a variety of proteases, suggesting that it may be a small peptide.     

Relationship of cognitive and affective behaviors to fear of strangers in male infants.

Examined the relationship of cognitive and affective variables to fear of strangers in fearful and nonfearful groups of 9-10 mo old male infants. Cognitive variables included object permanence, person permanence, rate of visual habituation to familiarity, and visual attention to novelty. Affective dimensions included approach-withdrawal, positive-negative mood, and intensity of response. Fearful infants had more mature person permanence concepts, showed more overall visual attention, and scored lower in approach to new stimuli than did nonfearful infants. Object permanence, rate of habituation, attention to novelty, predominant mood state, and intensity of positive and negative responses did not differentiate between the fear and nonfear groups. (24 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)