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The goal of this study was to determine the influence of contrast on the response properties of neurons in ferret primary visual cortex. We show that neurons in primary visual cortex of the ferret exhibit contrast-invariant orientation tuning, as assessed by measures of Gaussian half-width at half-maximum response. Contrast does, however, influence the structure of orientation-tuning curves, as measures of circular variance decrease with increasing contrast. A similar effect of contrast on circular variance has been described in a recent preliminary report for neurons in monkey V1 Shapley et al. 2002 ; indicating that this property of visual processing is shared across species. In the ferret, we show that the change in CV is driven by an increase in preferred orientation activity at high contrast and is not related to changes in orientation-tuning bandwidth or changes in activity at null orientations. We also show that V1 neurons in ferret display a contrast-dependent rightward shift in the high temporal-frequency stimuli that elicit a half-maximum response. While past efforts have suggested that this contrast-dependent shift could rely on intracortical mechanisms Carandini et al. 1997; Kayser et al. 2001 ; , results from the present study show that the degree of shift experienced by cortical neurons is similar in magnitude to that of LGN neurons. Thus, the effect of contrast on temporal-frequency tuning in ferret cortex appears to reflect the response profiles of feed-forward inputs from the thalamus. Finally, our results demonstrate a significant increase in the contrast-dependent phase advance of cortical neurons compared to LGN neurons. In the following sections, we discuss the paradoxical findings of contrast-invariant orientation tuning and contrast-dependent changes in circular variance; we also consider potential neural mechanisms to account for the effects of contrast on cortical responses.
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Reminders: 1 ; we want to meet all the new ferrets, so please introduce yourself in the site 14 section! 2 ; invite the other good writers you know to join us! site note: none of these reminders are a requirement for the contest - we just want to enlarge our ferret family.
2.1 The CME CPD programme will seek and receive formal approval from the Education Committee of the Hong Kong Academy of Medicine HKAM ; before implementation. 2.2 Any changes to the CME CPD programme will also be approved by the Academy Education Committee before implementation. 2.3 All Fellows of the College who are also Fellows of the HKAM must satisfy the full requirements of the CME CPD programme by the end of each Cycle. 2.4 The College will ensure compliance with.
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Elemental analyses suggested that between 0 3 and 54 wt? o of the tailings is in the form of ca2--s04" salts. Assuming that all sulphate and an equimolar amount of calcium in Table and feverfew.
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Time 9: 30 Abstract # 663 Impact assessment of feeding high-oil corn to poultry in Brazil. Ermias Kebreab * 1, James France1, Richard Phipps2, Steve Leeson1; 1University of Guelph Department of Animal and Poultry Science, University of Guelph, Guelph, ON, Canada, 2The University of Reading School of AP&D, Earley Gate, Reading, UK Electrostatic space charge system for dust reduction and air quality improvement in commercial broiler facilities. Casey Ritz * 1, Bailey Mitchell2, Brian Fairchild1, Michael Czarick1, John Worley1; 1 University of Georgia, 2Southeast Poultry Research Laboratory USDA-ARS In-house composting of litter and poultry carcasses infected with avian influenza. George W. Malone * 1, Sandy S. Cloud1, Robert L. Alphin1, Lewis E. Carr2, Nathaniel L. Tablante2; 1University of Delaware, Newark, 2University of Maryland, College Park Spatial Variability of Nutrient Species Within a Poultry House. Phillip R. Owens * , Dana M. Miles, Dennis E. Rowe; USDA-ARS, Waste Management and Forage Research Unit, MS State.
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Discussedhere, the spectra statistically generally do not 0.8 permit such a detailed analysis. 5 0.6 In the spectraof aluminum-free lithium, sodium, and Eoo potassium silicate melts, Raman bands assigned to SiO3- Q' ; , Si, Oi Q3 ; , and SiO, Q' ; units can be iden3 o.z tified Figs. 5-10 ; . The band near ll00 cm ' zr ; as0.0 signedto Si-O- stretchingin a structural unit with NBO Si: t 1q' or SirO!- units ; .The bandsnear l150-1200 0.8 cm-t voand zr ; result from the presenceof three-dimensional network units Qo or SiO, units ; . The band or 5 0.6 shouldernear 950 cm ' 2, ; is assigned Si-O- stretchto Eoo ing in a structural unit with NBO Si : 2 SiOl 3 o.z units ; . The broader band near 600 cm ' is assignedto the mixed stretch and bending modes in mixtures of 0.0 0.0 0.1 o.2 0.3 0.4 0.5 SirO3 and SiOl-. The anionic structure of Al-free tetraAl Al + Si ; silicate melts is, therefore, viewed as mixture of threedimensionally interconnected structural units, together 0.8 with units wirh NBO Si: I and units with NBO Si: 2. 5 o.o For Al-free tetrasilicatemelts, Reaction 5 adequatelydeo g 0.4 scribes, therefore, the anionic equilibrium. This conclusion accordswith those from other Raman and Nrrrndata 3 o.z for melts and glassesin the same polymerization range 0.0 e.g., Virgo et al., 1980; Mysenet al., 1980, 1982b; Mat0.0 0.1 0.2 0.3 Al Al + son et al., 1983; Murdoch et al., 1985; Kirkpatrick et al., 1986; Stebbins, 1987, 1988 ; . Fig. 13. Relative abundanceof structural units as a function Substitution of Al3 + for Sia + with concomitant Li, Na, of bulk-melt Al Al + Si ; for the systemsindicated. or K charge-balancing has two principal spectral effects. The intensity relations among the bands change, and the frequenciesofsome ofthe diagnostic bands are affected. Kirkpatrick et al., 1986 ; as well as other Raman data There is no evidencefor additional bands in the spectra Domine and Piriou, 1986 ; indicating, therefore, that the as the Al content of the melts is increased.Thus, a reac- Qo unit NBO Si : 0 ; principal location for Al3 * in tion analogousto Reaction 5 can be written for the an- the melts relative to Q3 NBO Si : l ; and Q'? NBO Si : ionic equilibrium in the aluminosilicate melts by replac- 2 ; units. ing Si in Reaction 5 with T [where T : Sia + + MAl ; a * ; that Mysen et al. 1981, 1985 ; suggested the preference M : alkali metall. of Al for fully polymerized structural units could be raThe Al-dependent frequencies of the high-frequency tionalized by analogy with crystal-chemical data from Raman bands Figs. 8-10 ; may be related to Al substi- aluminosilicate minerals. In such silicates, Al shows a for tution for Si in the structural units. The zo and z, band distinct preference the tetrahedral site neighboringthe frequenciesare lowered with increasingbulk-melt All Al oxygen bridge with the smallest intertetrahedral angle e.g., * Si ; , whereasthose ofthe z, and z, bands are less sen- Brown et al., 1969 ; .Among the three coexistingstructural sitive to Al contents Fig. I l ; . The frequency decreases units dominating the structure of the aluminum-bearing either result from Si, Al ; coupling or a decreasein the alkali tetrasilicate melts, from geometric considerations force constant resulting from the weakening of the T-O it is most likely that the fully polymerized unit in a given bonds as Al is substituted for Si, or both. In either case, system has the smallest average intertetrahedral angle the frequency reductions reflect substitution of Al3 * for Furukawa et al., l98l ; . Thus, a preferenceby Al3 * for Si4 * in tetrahedralcoordination. With lessthan l0o o-20o o such units would be expectedin accord with the strucAl in substitution for Si in the Na- and K-bearing sys- tural interpretation of the Raman spectra. tems, the frequenciesof thesetwo bands do not vary with CorvrposrrroN-ABUNDANcE RET IoNS All Al + Si ; , but they do show a decrease the Al conas tents are increasedfurther. The greater sensitivity of the The intensities of Si-O- stretch bands 2, and z. ; from SiOostretch-band zo * zr ; frequenciesas compared with the deconvoluted, high-frequencyenvelopesofthe specof those of the Si-O- stretch bands 2, and z. ; might reflect tra can be usedto estimate the relative abundances the a preferenceof the Al3 * for the most polymerized struc- structural units in the melts as discussedabove. The retural unit TO, or Qa ; relative to structural units that sults ofthese calculations are shown in Figure 13. In all contain nonbridging oxygen TrO3- and TO3-, or Q3 and three systems, the abundance of TrO' Q' ; units desee Q'z; also Mysen et al., I 98 I , I 985 ; . This conclusionis creases, and the abundancesof TO, Q' ; and TO, Q' ; consistent with 'z?Aland 2eSi NMR spectroscopyof melts units increase systematically as a function of increasing of similar compositions e.g., Engelhardtet al., 1985; All AI + Si ; the melt. As no other structural units can.
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Other securities Other investments recognised under current assets are measured at the market price at the balance sheet date. Both realised and unrealised gains and losses are recognised in the income statement under financial items. Equity Dividend Proposed dividend is recognised as a liability at the time of adoption of the dividend resolution at the annual general meeting the time of declaration ; . Dividend expected to be paid for the year is shown as a separate item under equity and flax.
When you change the way you look at things, the things you look at change. Change the way you think about aging and you'll see your future with new eyes. You'll change the things you look at and see them differently. Since we're not going to die at 60 or 65, unlike all previous generations, we can look forward to a brand new stage of life--the equivalent of an entire Second Adulthood. Isn't it amazing to realize that you can choose to keep growing and developing as a healthy, more complete person for he real voyage of an extra 30 years? Doesn't that change the way you discovery consists feel about yourself today, as well as how you think not in seeking new about tomorrow? And if you're a Baby Boomer, you landscapes but in can start today to change the outdated beliefs our country has about aging and start working to seeing with new eyes." update our archaic policies about Elders and our Marcel Proust deplorable system of long term care.
P31 Possible inhibitory compounds of matrix metalloproteases extracted from marine cyanobacteria and microalgae. K.J. Hatfield, K-J. Andersen * , B. Gharehnia * , A. Utheim * and G. Knutsen * Institute of Medicine and Department of Microbiology, University of Bergen, N-5020 Bergen, Norway Pilot studies on extracts of marine cyanobacteria and microalgae have shown that such organisms may play a major role as potential cancer-drugs. Closer studies with selected species are now under way, especially a Phormidium type is in focus for the moment. The algae used in our laboratory were isolated from a Norwegian fiord and brought into pure culture. Biomass for extraction was produced photosynthetically in 10 litre reactors, with seawater based Z8 medium. The cells were collected by centrifugation and homogenized by sonication. Then the homogenate was extracted with an organic solute and used in the effect studies. We have investigated the effect of such preparations on Matrix Metalloproteases MMP ; from ventricle biopsy material by gelatine zymography. Data show protease inhibition, both of ventricle tissue material activity and of pure gelatinase activity. Gelatine zymography also shows protease activity in the algal preparations themselves. The further strategy to study this protease activity involves invasion- and viability assays, growth of spheroids on collagen gel and confrontation of normal- and cancer cells, using confocal laser scanning microscope for observation. Different growth conditions of the algae will be used for possible optimization of bioactivity, and the isolation and identification of the active molecules are the ultimate goals. P32 Resistance related mutations in patients receiving highly active antiretroviral therapy L. Bergaust1, K.I. Kristiansen2 , S.S. Frland2 1 IKB, box 5040, 1432 NLH, Norway, 2Dept. of Molecular Biology, Institute of Medical Microbiology, University of Oslo, Rikshospitalet, Oslo, Norway The object of this study is to identify and characterize drug resistance mutations in the reverse transcriptase and protease genes of HIV-1 in treatment experienced patients by means of RT-PCR and sequencing. The RT enzyme is unique to retroviruses and catalyzes the incorporation of deoxynucleoside triphosphates dNTPs ; into an evolving negative-sense DNA strand by using HIV positive sense viral RNA as a template. Furthermore, the enzyme catalyzes the degradation of the positive sense RNA strand by means of RNaseH activity and, by DNA polymerase activity, generates a new positive sense DNA strand to yield double stranded proviral DNA [1]. Because the RT enzyme lacks 3' exonuclease activity and therefore cannot proofread its own errors, uncorrected errors will occur at a high rate approximately 1 base error per cycle ; . This promotes the rapid appearance of genetically unique viruses, and allows the virus to adjust to changes in the environment for instance in medical treatment. Since its discovery in 1996, Highly Active Antiretroviral Therapy HAART ; has been administered to patients infected with HIV [2]. Up to 85% of these respond satisfactory to treatment over variable periods of time, but eventually resistance arises with all known regimens. Mortality is still high and optimal treatment remains to be observed. An important issue is the mapping of mutational patterns in relation to type of regimen, immunologic and viral responses. Different approaches to estimating what benefit the regimens yield have been discussed. Phenotyping, genotyping, retrospective and prospective studies are ways to get answers or at least indications as to what happens when treatment fail. References: [1] Loveday, C., Department of retrovirology, Royal Free & University College Medical School, London, United Kingdom. Lippicot Williams & Wilkins, Inc., Philadelphia. 2001. [2] Palella FJ et al. N Eng J Med 1998, 338, 853 and flecainide.
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New Federally Funded Research Program Aims to Improve Survival from Cardiac Arrest and Severe Trauma "Surviving traumatic injury and cardiac arrest is a serious public health issue. Tens of thousands of Americans die each year from sudden cardiac arrest and trauma. The good news is that there is a growing body of research -- basic research and small studies -- that suggests a significant number of these people can be saved.
The concept of "g" of activity originated from the situation where the antibiotic preparation selected as the reference standard was thought to consist entirely of a single chemical entity and was therefore assigned a potency of 1000 "g" per mg. In several such instances, as a result of the development of manufacturing and purification methods for particular antibiotics, preparations became available that contained more than 1000 "g" of activity per mg. It was then understood that such preparations had an activity equivalent to a given number of "g" of the original reference standard. In most instances, however, the "g" of activity is exactly equivalent numerically to the g weight ; of the pure substance. In [some] cases the "g" of activity defined in terms of a "Master Standard" is tantamount to a "Unit." The "g" of activity should therefore not be assumed necessarily to correspond to the g weight ; of the antibiotic substance and flexeril.
Snow snow cm rain mm max ° c -3 -2 -3 0 0 -1 -3 -1 0 -1 min ° c -5 -5 -5 -1 0 -2 -7 -2 -3 -3 2 0 -5 wchill ° c -10 -11 -10 -5 -5 -8 -13 -7 -7 -7 -1 -2 -8 0 -4 -5 -2 -4 freezing level m ; 1300 1150 1200 sunrise - 6: 50 6: sunset the above table gives the weather forecast for la fouly - val ferret at the specific elevation of 1858m!
Hence c bears no relation to w and s . 185 and flolan.
Vaccine strains of viruses and circulating strains could partly explain the occurrence of these outbreaks. On a broader perspective, health-care policy makers need to develop locally relevant and practical vaccination policies. An example would be the vaccination of poultry workers in places where avian influenza is endemic. Health authorities should ensure that vaccine supplies are adequate for target populations, especially in unexpected situations where overall vaccine shortage is imminent.63 The logistics of vaccinating target groups in the community and health care institutions ; should be well planned, taking into account contingency measures during pandemic situations. The government's preparedness plan for an influenza pandemic is a good example of this process in action.64 Frontline doctors and health care workers should realise the importance of being vaccinated, not only for personal protection, but also for the protection of patients. In addition, those working in primary care could further promote vaccine uptake in the community by providing adequate information and provision of vaccination, especially to at-risk populations and ferret.
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Heilbrunn SM, Shah P, Bristow MR, Valantine HA, Ginsburg R and Fowler MB 1989 ; Increased receptor density and improved hemodynamic response to catecholamine stimulation during long-term metoprolol therapy in heart failure from dilated cardiomyopathy. Circulation 79: 483 490. Hein L and Kobilka BK 1997 ; Adrenergic receptors: From molecular structure to in vivo function. Trends Cardiovasc Med 7: 137145. Herzig S, Meier A, Pfeiffer M and Neumann J 1995 ; Stimulation of protein phosphatases as a mechanism of the muscarinic receptor-mediated inhibition of cardiac L-type Ca2 channels. Pflueger's Arch 429: 531538. Hieble JP, Bylund DB, Clarke DE, Eikenburg DC, Langer SZ, Lefkowitz RJ, Minneman KP and Ruffolo RR 1995 ; International Union of Pharmacology X. Recommendation for nomenclature of 1-adrenoceptors: Consensus update. Pharmacol Rev 47: 267270. Higginbotham MB, Morris KG, Williams RS, Coleman RE and Cobb FR 1986 ; Physiologic basis for the age-related decline in aerobic work capacity. J Cardiol 57: 1374 1379. Hill RJ, Neligan M and Keenan AK 1987 ; Identification of presynaptic 2adrenoceptors in human atria. Med Sci Res 15: 14631465. Hirasawa A, Horie K, Tanaka T, Takagaki K, Murai M, Yano J and Tsujimoto G 1993 ; Cloning, functional expression and tissue distribution of human cDNA for the 1C-adrenergic receptor. Biochem Biophys Res Commun 195: 902909. Hirasawa A, Shibata K, Horie K, Takei Y, Obika K, Tanaka T, Muramoto N, Takagaki K, Yano J and Tsujimoto G 1995 ; Cloning, functional expression and tissue distribution of human 1C-adrenoceptor splice variants. FEBS Lett 363: 256 260. Hoit BD, Khoury SF, Kranias EG, Ball N and Walsh RA 1995 ; In vivo echocardiographic detection of enhanced left ventricular function in gene targeted mice with phospholamban deficiency. Circ Res 77: 632 637. Hool LC, Oleksa LM and Harvey RD 1997 ; Role of G proteins in -adrenergic inhibition of the -adrenergically activated chloride current in cardiac myocytes. Mol Pharmacol 51: 853 860. Hossack KF and Bruce RA 1982 ; Maximal cardiac function in sedentary normal men and women: Comparison of age-related changes. J Appl Physiol 53: 799 804. Hove-Madsen L, Mery P-F, Jurevicius J, Skeberdis AV and Fischmeister R 1996 ; Regulation of myocardial calcium channels by cyclic AMP metabolism. Basic Res Cardiol 91 Suppl 2 ; : 1 Hulme EC, Birdsall NJM and Buckley NJ 1990 ; Muscarinic receptor subtypes. Annu Rev Pharmacol Toxicol 30: 633 673. Hwang K-C, Gray CD, Sweet WE, Moravec CS and Im M-J 1996 ; 1-Adrenergic receptor coupling with Gh in the failing human heart. Circulation 94: 718 726. Iaccarino G, Dolber PC, Lefkowitz RJ and Koch WJ 1999 ; -Adrenergic receptor kinase-1 levels in catecholamine-induced myocardial hypertrophy: Regulation by - but not 1-adrenergic stimulation. Hypertension 33: 396 401. Iaccarino G, Rockman HA, Shotwell KF, Tomhave ED and Koch WJ 1998a ; Myocardial overexpression of GRK3 in transgenic mice: Evidence for in vivo selectivity of GRKs. J Physiol 275: H1298 H1306. Iaccarino G, Tomhave ED, Lefkowitz RJ and Koch WJ 1998b ; Reciprocal in vivo regulation of myocardial G protein-coupled receptor kinase expression by -adrenergic receptor stimulation and blockade. Circulation 98: 17831789. Ihl-Vahl R, Eschenhagen T, Kubler W, Marquetant R, Nose M, Schmitz W, Scholz H and Strasser RH 1996 ; Differential regulation of mRNA specific for 1- and -adrenergic receptors in human failing hearts: Evaluation of the absolute car2 diac mRNA levels by two independent methods. J Mol Cell Cardiol 28: 110. Ikeda U, Tsuruya Y and Yaginuma T 1991 ; 1-Adrenergic stimulation is coupled to cardiac myocyte hypertrophy. J Physiol 260: H953H956. Im M-J and Graham RM 1990 ; A novel guanine nucleotide-binding protein coupled to the 1-adrenergic receptor. I. Identification by photolabeling of membrane and ternary complex preparations. J Biol Chem 265: 18944 18951. Im M-J, Riek RP and Graham RM 1990 ; A novel guanine nucleotide-binding protein coupled to the 1-adrenergic receptor. II. Purification, characterization, and reconstitution. J Biol Chem 265: 1895218960. Inui J, Brodde O-E and Schumann HJ 1982 ; Influence of acetylcholine on the positive inotropic effect evoked by - or -adrenoceptor stimulation in the rabbit heart. Naunyn-Schmiedeberg's Arch Pharmacol 320: 152159. Ishikawa Y and Homcy CJ 1997 ; The adenylyl cyclases as integrators of transmembrane signal transduction. Circ Res 80: 297304. Ito H, Hosoya Y, Inanobe A, Tomoike H and Endoh M 1995 ; Acetylcholine and adenosine activate the G protein-gated muscarinic K channel in ferret ventricular myocytes. Naunyn-Schmiedeberg's Arch Pharmacol 351: 610 617. Iwase M, Bishop SP, Uechi M, Vatner DE, Shannon RP, Kudej RK, Wight DC, Wagner TE, Ishikawa Y, Homcy CJ and Vatner SF 1996 ; Adverse effects of chronic endogenous sympathetic drive induced by cardiac Gs alpha overexpression. Circ Res 78: 517524. Iwase M, Uechi M, Vatner DE, Asai K, Shannon RP, Kudej RK, Wagner TE, Wight DC, Patrick TA, Ishikawa Y, Homcy CJ and Vatner SF 1997 ; Cardiomyopathy induced by Gs overexpression. J Physiol 272: H585H589. Jaber M, Koch WJ, Rockman H, Smith B, Bond RA, Sulik KK, Ross J Jr, Lefkowitz RJ, Caron MG and Giros B 1996 ; Essential role of -adrenergic receptor kinase 1 in cardiac development and function. Proc Natl Acad Sci USA 93: 12974 12979. Jahnel U, Jakob H and Nawrath H 1992 ; Electrophysiologic and inotropic effects of -adrenoceptor stimulation in human isolated atrial heart muscle. NaunynSchmiedeberg's Arch Pharmacol 346: 82 87. Jahns R, Boivin V, Siegmund C, Inselmann G, Lohse MJ and Boege F 1999 ; Autoantibodies activating human 1-adrenergic receptors are associated with reduced cardiac function in chronic heart failure. Circulation 99: 649 654. Jakob H, Nawrath H and Rupp J 1988 ; Adrenoceptor-mediated changes of action potential and force of contraction in human isolated ventricular heart muscle. Br J Pharmacol 94: 584 590. Jakob H, Oelert H, Rupp J and Nawrath H 1989 ; Functional role of cholinoceptors and purinoceptors in human isolated atrial and ventricular heart muscle. Br J Pharmacol 97: 1199 1208 and flu.
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