Northern Illinois University

About: Northern Illinois University is a education organization based out in DeKalb, Illinois, United States. It is known for research contribution in the topics: Large Hadron Collider & Population. The organization has 8818 authors who have published 20008 publications receiving 632341 citations. The organization is also known as: NIU.

Calculation and Miscalculation of the Allometric Equation as a Model in Biological Data

Abstract: The simple linear regression model, (1) Y= 0o+ 31X, where Y is the dependent variable, X is the independent variable, and P0 and P1 are population parameters to be estimated empirically, often does not adequately describe or represent the relationship between the two variables. A commonly used procedure to arrive at a more descriptive model is to fit a higher degree polynomial, (2) Y=f3o+1 1X1+32X22+ 03X33 +... +RX,. Since the polynomial regression is simply a multiple linear regression, it can be fitted easily by ordinary least squares techniques, especially with the aid of a digital computer. At times, however, the researcher may believe that his data are better fit by a model where the parameters do not enter linearly. There are several nonlinear regression models in use in biology; what follows is a discussion of one such model, emphasizing the caution which must be exercised in fitting the model by the common approximate method.

Indexing space and time in film understanding

Abstract: We investigated the extent to which understanders monitor shifts in time and space during film comprehension. Participants viewed a feature-length film and identified those points in the film in which they perceived a change in situation. We performed an a priori analysis of the films to identify the shifts in time, the movement of characters, and region. The relationship between the theoretical analysis of the films and the participants judgements of situational change was assessed. The results provide support for the Event Indexing Model and suggest that situation models for filmed events are indexed along multiple dimensions of situational continuity. Furthermore, the pattern of results was similar for narrative film as they are for narrative text. This finding suggest that there are general mechanisms for event understanding that operate independently of medium or mode of experience. Copyright © 2001 John Wiley & Sons, Ltd.

Proactive Supply Management: The Management of Risk

Abstract: IN BRIEF Proactive supply management is a frequently used phrase, yet no agreement exists about its precise meaning This article argues that proactive purchasing management is risk management, a perspective that evolved from case studies of the purchasing function To better understand risk management from the perspective of purchasing management, it is analyzed within the context of transaction cost theory and the resource dependency model Evidence is provided from the case studies that risk management is an appropriate framework for understanding proactive purchasing management Examples of risk management through proactive purchasing activities are presented

Prime time for Bacillus megaterium.

Abstract: It is evident that B megaterium is an intriguing organism because of its biochemical versatility, its wide distribution ecologically, its ability to undergo sporulation, and its usefulness as an industrial production strain and expression host With the progress in genetics and the availability of molecular tools such as new transposons, vectors and efficient transformation, an understanding of some of the organization and regulation of many genes is increasing rapidly Such recent discoveries as the ability of oxetanocin to combat some medically significant, recalcitrant viruses further demonstrates that there is much to be learned and much to benefit from continued study of B megaterium

Plasticity of auditory cortex associated with sensorineural hearing loss in adult C57BL/6J mice

Abstract: The representation of frequency was mapped in the primary auditory cortex (AI) of C57BL/6J (C57) mice during young adulthood (15-2 months) when hearing is optimal, and at 3, 6, and 12 months of age, a period during which progressive, high frequency, sensorineural hearing loss occurs in this strain Maps were also obtained from CBA/CaJ mice which retain good hearing as they age In AI of young adult C57 mice and CBA mice, characteristic frequencies (CFs) of multiple-unit clusters were easily identified with extracellular recordings, and a general tonotopic organization was observed from dorsal (high frequency) to ventral and caudal (low frequency) In individual cases there appeared to be deviations from the above tonotopic organization, despite the fact that inbred mice are genetically invariant As progressive loss of high frequency sensitivity ensued peripherally, a substantially increased representation of middle frequencies was observed in AI There was no apparent change in the surface area of the auditory cortex despite the elimination of high frequencies, and virtually the entire auditory cortex became devoted to the middle frequencies (especially 10-13 kHz) for which sensitivity remained high Similar age-related changes were not observed in normal-hearing CBA mice These findings indicate that plasticity in the representation of frequency in AI is associated with high frequency hearing loss in C57 mice