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Selected AbstractsRedesigning Corporate Governance Structures and Systems for the Twenty First CenturyCORPORATE GOVERNANCE, Issue 3 2001Robert A.G. Monks How a corporation is governed has become in recent years an increasingly important element in how it is valued by the market place. McKinsey & Company in June 2000 published the results of an Investor Opinion Survey of attitudes about the corporate governance of portfolio companies. The survey gathered responses about investment intentions from over 200 institutions who together manage approximately $3.25 trillion in assets. Ranging from 17 per cent in the US and Britain to over 27 per cent in Venezuela, investors placed a specific premium on what was called "Board Governance". To put this into perspective, consider how greatly sales would have to increase, expenses be cut and margins improved to achieve a comparable impact on value. "For purposes of the survey, a well governed company is defined as having a majority of outside directors on the board with no management ties; holding formal evaluations of directors; and being responsive to investor requests for information on governance issues. In addition, directors hold significant stockholdings in the company, and a large proportion of directors' pay is in the form of stock options." This correlation of governance with market value by one of the most respected consulting companies in the world creates the foundations of a new language for management accountability. McKinsey has great credibility as a value-adding advisor to corporate managements. Governance is not a cause or a theology for McKinsey; it is an important element in the value of an enterprise. By getting the opinion of what we call Global Investors with portfolios of holdings on every continent, McKinsey has importantly impacted the cost of capital for all corporations henceforth. Admittedly, McKinsey's criteria of "board governance" are blunt. "Every organization attempting to accomplish something has to ask and answer the following question," writes Harvard Business School professor Michael C. Jensen in the introduction to his recent working paper: "What are we trying to accomplish? Or, put even more simply: When all is said and done, how do we measure better versus worse? Even more simply: How do we keep score... . I say long-term market value to recognize that it is possible for markets not to know the full implications of a firm's policies until they begin to show up.... Value creation does not mean succumbing to the vagaries of the movements in a firm's values from day to day. The market is inevitably ignorant of many of our actions and opportunities, at least in the short run...". Surprisingly little attention is paid to what we all intuitively know, that talented people are not entirely motivated by financial compensation. Directors therefore must pay special attention to creating an appropriate environment for stimulating optimum management performance. [source] Inconsistent use of host plants by the Alaskan swallowtail butterfly: adult preference experiments suggest labile oviposition strategyECOLOGICAL ENTOMOLOGY, Issue 2 2007SHANNON M. MURPHY Abstract 1.,The Alaskan swallowtail butterfly (Papilio machaon aliaska) uses three unrelated plant species as hosts: Cnidium cnidiifolium (Apiaceae), Artemisia arctica (Asteraceae), and Petasites frigidus (Asteraceae). The research presented here investigated whether there are any consistent patterns in host choice by P. m. aliaska females. 2.,The first two experiments were designed to test if P. m. aliaska host preference is constant or if it changes from day to day. If host preference is labile, the experiments were designed to also test whether a female's diet breadth narrows or expands over time. 3.,The third experiment tested the host preferences of female offspring from several wild-caught P. m. aliaska females. If P. m. aliaska individuals are specialised in their host use, then all of the offspring from a single female would likely prefer the same host-plant species. This experiment was also designed to test the Hopkins' host selection principle; does the food plant on which a female is reared as a larva influence her future choices when she is searching for host plants for her own offspring? 4.,The results from all of these experiments indicate that P. m. aliaska females vary greatly in their oviposition behaviour and in their preferences for the three host plants. Most populations appear to consist of generalists with labile oviposition behaviour. There is no evidence to support the Hopkins' host selection principle. 5.,It is suggested that the generalised selection of host plants by P. m. aliaska females may be a ,bet-hedging' strategy and that this strategy may maximise reproductive fitness in an unpredictable environment. [source] An operational algorithm for residential cogeneration systems based on the monitored daily-basis energy demandELECTRICAL ENGINEERING IN JAPAN, Issue 2 2010Yuka Yamagishi Abstract Residential cogeneration systems with PEFC are promising as distributed power system resources with the ability to improve energy system efficiency. However, it is important to develop an efficient algorithm for operation because the energy demand at each house differs greatly from day to day. In this paper, we propose an operational algorithm and evaluate it from the viewpoint of energy conservation and economic effectiveness based on the energy demand characteristics. In the algorithm, the hot water and electricity demand on the next day are estimated based on the average of past data. The results of simulations using actually monitored energy demand data indicate that (1) the greater the electrical demand of a household, the more effective this algorithm becomes with respect to energy conservation; (2) the greater the hot water demand of a household, the more effective this algorithm becomes with respect to economic effectiveness. © 2009 Wiley Periodicals, Inc. Electr Eng Jpn, 170(2): 37,45, 2010; Published online in Wiley InterScience (www.interscience.wiley. com). DOI 10.1002/eej.20892 [source] Application of dodecyldimethyl (2-hydroxy-3-sulfopropyl) ammonium in wall modification for capillary electrophoresis separation of proteinsELECTROPHORESIS, Issue 3 2005Wei Wei Abstract A zwitterionic surfactant, dodecyldimethyl (2-hydroxy-3-sulfopropyl) ammonium (C12H25N+(CH3)2CH2CHOHCH2SO3,), named dodecyl sulfobetaine (DSB), was used as a novel modifier to coat dynamically capillary walls for capillary electrophoresis separation of basic proteins. The DSB coating suppressed the electroosmotic flow (EOF) in the pH range of 3,12. At high DSB concentration, the EOF was suppressed by more than 8.8,times. The DSB coating also prevented successfully the adsorption of cationic proteins on the capillary wall. Anions, such as Cl,, Br,, I,, SO42,, CO32,, and ClO4,, could be used as running buffer modifiers to adjust the EOF for better separation of analytes. Using this dynamically coated capillary, a mixture of eight inorganic anions achieved complete separation within 4.2,min with the efficiencies from 24,000 to 1,310,000,plates/m. In the presence of ClO4, as EOF adjustor, the separation of a mixture containing four basic proteins (lysozyme, cytochrome c, ,-chymotrypsinogen,A, and myoglobin) yielded efficiencies of 204,000,896,000,plates/m and recoveries of 88%,98%. Migration time reproducibility of these proteins was less than 0.5% relative standard deviation (RSD) from run to run and less than 3.1% RSD from day to day, showing promising application of this novel modifier in protein separation. [source] Ace2, rather than ace1, is the major acetylcholinesterase in the silkworm, Bombyx moriINSECT SCIENCE, Issue 4 2009Hui-Juan Chen Abstract, Two acetylcholinesterase (ace) genes have been reported in many insect species. In pests such as Helicoverpa assulta and Plutella xylostellas, ace1 gene encodes the predominant synaptic enzyme that is the main target of organophosphorus (OP) and carbamate pesticides. It has been reported that pesticide selection has an impact on the ace gene evolution. The domesticated silkworm, Bombyx mori, also has two ace genes. We studied ace gene expression and enzyme activities in silkworm as this has not faced pesticide selection over the past decades. The expression levels of two ace genes, Bm- ace1 and Bm- ace2, were estimated by quantitative real-time polymerase chain reaction. Bm- ace2 was expressed more highly than Bm- ace1 in all tested samples of different developmental stages or tissues, suggesting ace2, rather than ace1, is the major type of acetylcholinesterase (AChE) in Bombyx mori. This is inconsistent with the aforementioned lepidopterons agricultural pests, partly be due to the widespread use of pesticides that may induce high expression of the ace1 gene in these pests. Besides high expression in the head, Bm- ace1 also expresses highly in the silk glands and Bm- ace2 is abundant in the germline, implying both ace genes may have potential non-hydrolytic roles in development. Furthermore, we found that the mRNA levels of two ace genes and their ratios (ace2/ace1) change day to day in the first and third instars. This challenges the conventional method of estimating enzymatic activity using crude extract as an enzyme solution, as it is a mixture of AChE1 and AChE2. An efficient and simple method for separating different AChEs is necessary for reliable toxicological analyses. [source] Model predictive control with learning-type set-point: Application to artificial pancreatic ,-cellAICHE JOURNAL, Issue 6 2010Youqing Wang Abstract A novel combination of model predictive control (MPC) and iterative learning control (ILC), referred to learning-type MPC (L-MPC), is proposed for closed-loop control in an artificial pancreatic ,-cell. The main motivation for L-MPC is the repetitive nature of glucose-meal-insulin dynamics over a 24-h period. L-MPC learns from an individual's lifestyle, inducing the control performance to improve from day to day. The proposed method is first tested on the Adult Average subject presented in the UVa/Padova diabetes simulator. After 20 days, the blood glucose concentrations can be kept within 68,145 mg/dl when the meals are repetitive. L-MPC can produce superior control performance compared with that achieved under MPC. In addition, L-MPC is robust to random variations in meal sizes within ±75% of the nominal value or meal timings within ±60 min. Furthermore, the robustness of L-MPC to subject variability is validated on Adults 1,10 in the UVa/Padova simulator. © 2009 American Institute of Chemical Engineers AIChE J, 2010 [source] Leptin and Insulin Action in the Central Nervous SystemNUTRITION REVIEWS, Issue 2002Daniel Porte Jr M.D. Body adiposity is known to be carefully regulated and to remain relatively stable for long periods of time in most mammalian species. This review summarizes old and recent data implicating insulin and leptin as key circulating signals to the central nervous system, particularly the ventral hypothalamus, in communicating thesizeand thedistribution of body fat stores. This input ultimately alters food intake and energy expenditure to maintain constancy of the adipose depot. The key primary neurons in the arcuate nucleus containing NPY/AgRP and POMC/CART appear be critical constituents of the CNS regulating system, and are shown to contribute to anabolic and catabolic signaling systems to complete the feedback loop. New data to indicate shared intracellular signaling from leptin and insulin is provided. The satiety system for meals, consisting of neural afferents to the hind-brain from the gastrointestinal tract, is described and its effectiveness is shown to vary with the strength of the insulin and leptin signals. This provides anefferent mechanism that plays a key role in a complex feedback system that allows intermittent meals to vary from day to day, but provides appropriate long-term adjustment to need. Recently described contributions of this system to obesity are described and potential therapeutic implications are discussed. [source] In situ and remote-sensing measurements of the mean microphysical and optical properties of industrial pollution aerosol during ADRIEXTHE QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY, Issue S1 2007S. R. Osborne Abstract We present a summary of the principal physical and optical properties of aerosol particles using the FAAM BAE-146 instrumented aircraft during ADRIEX between 27 August and 6 September 2004, augmented by sunphotometer, lidar and satellite retrievals. Observations of anthropogenic aerosol, principally from industrial sources, were concentrated over the northern Adriatic Sea and over the Po Valley close to the aerosol sources. An additional flight was also carried out over the Black Sea to compare east and west European pollution. Measurements show the single-scattering albedo of dry aerosol particles to vary considerably between 0.89 and 0.97 at a wavelength of 0.55 µm, with a campaign mean within the polluted lower free troposphere of 0.92. Although aerosol concentrations varied significantly from day to day and during individual days, the shape of the aerosol size distribution was relatively consistent through the experiment, with no detectable change observed over land and over sea. There is evidence to suggest that the pollution aerosol within the marine boundary layer was younger than that in the elevated layer. Trends in the aerosol volume distribution show consistency with multiple-site AERONET radiometric observations. The aerosol optical depths derived from aircraft measurements show a consistent bias to lower values than both the AERONET and lidar ground-based radiometric observations, differences which can be explained by local variations in the aerosol column loading and by some aircraft instrumental artefacts. Retrievals of the aerosol optical depth and fine-mode (<0.5 µm radius) fraction contribution to the optical depth using MODIS data from the Terra and Aqua satellites show a reasonable level of agreement with the AERONET and aircraft measurements. © Crown Copyright 2007. Reproduced with the permission of the Controller of HMSO. Published by John Wiley & Sons, Ltd [source] Cryptic local populations in a temperate rainforest bat Chalinolobus tuberculatus in New ZealandANIMAL CONSERVATION, Issue 4 2000Colin F. J. O'Donnell Population structure of the threatened long-tailed bat (Chalinolobus tuberculatus) was studied over five summers between 1993 and 1998, in temperate Nothofagus rainforest in Fiordland, New Zealand. Composition of 95 communal groups was sampled and spatial distribution of individually marked bats investigated. Individual C. tuberculatus moved to new roost sites virtually every day. Long term non-random associations among individuals were found by a cluster analysis that revealed three distinct social groups. Groups contained on average 72.0 (± 26.0) (mean ± SD), 99.3 (± 19.0) and 131.7 (± 16.5) marked individuals/year. Collective foraging ranges of the three groups overlapped but roosting occurred in three geographically distinct adjacent areas. Only 1.6% of individuals switched between groups. Non-reproductive females and males switched between groups more often than reproductive females but individuals switched only once or twice during the study and then just for one night. Juveniles of both sexes were associated with their natal group as 1 year-olds and then later when breeding. Social groups were cryptic because foraging ranges of groups overlapped, bats belonging to each group spread over many roosts each day, and these roost sites changed from day to day. Bats moved infrequently between groups, potentially linking the local population assemblages. Future research should explore whether the population is structured in demes. Population structure did not conform to traditional metapopulation models because groups occurred in homogeneous habitat extending over a large geographical area. Conserving bat populations should entail preserving a representative number of subgroups but development of models for predicting minimum number of effective local populations is still required. [source] Street Codes in High School: School as an Educational DeterrentCITY & COMMUNITY, Issue 3 2007Pedro Mateu-Gelabert Elsewhere we have documented how conflict between adolescents in the streets shapes conflict in the schools. Here we consider the impact of street codes on the culture and environment of the schools themselves, and the effect of this culture and on the students' commitment and determination to participate in their own education. We present the high school experiences of first-generation immigrants and African American students, distinguishing between belief in education and commitment to school. In an environment characterized by ineffective control and nonengaging classes, often students are not socialized around academic values and goals. Students need to develop strategies to remain committed to education while surviving day to day in an unsafe, academically limited school environment. These processes are sometimes seen as minority "resistance" to educational norms. Instead, our data suggest that the nature of the schools in which minority students find themselves has a greater influence on sustaining or dissuading students' commitment to education than do their immigration status or cultural backgrounds. [source] | ||||||||||