Modulation of Negative Work Output from a Steering Muscle of the Blowfly Calliphora Vicina

Of the 17 muscles responsible for flight control in flies, only the first basalar muscle (b1) is known to fire an action potential each and every wing beat at a precise phase of the wing-beat period. The phase of action potentials in the b1 is shifted during turns, implicating the b1 in the control of aerodynamic yaw torque. We used the work loop technique to quantify the effects of phase modulation on the mechanical output of the b1 of the blowfly Calliphora vicina. During cyclic length oscillations at 10 and 50 Hz, the magnitude of positive work output by the b1 was similar to that measured previously from other insect muscles. However, when tested at wing-beat frequency (150 Hz), the net work performed in each cycle was negative. The twitch kinetics of the b1 suggest that negative work output reflects intrinsic specializations of the b1 muscle. Our results suggest that, in addition to a possible role as a passive elastic element, the phase-sensitivity of its mechanical properties may endow the b1 with the capacity to modulate wing-beat kinematics during turning maneuvers

EVOLUTION OF IR-SELECTED GALAXIES IN Z~0.4 CLUSTERS

Wide-field optical and near--IR ($JHK$) imaging is presented for two rich galaxy clusters: Abell~370 at $z=0.374$ and Abell~851 (Cl0939+47) at $z=0.407$. Galaxy catalogs selected from the near--IR images are 90\% complete to approximately 1.5 mag below $K^\ast$ resulting in samples with $\sim$100 probable member galaxies per cluster in the central $\sim$2 Mpc. Comparison with $HST$ WFPC images yields subsamples of $\sim$70 galaxies in each cluster with morphological types. Analysis of the complete samples and the $HST$ subsamples shows that the $z\sim 0.4$ E/S0s are bluer than those in the Bower et al.\ (1992) Coma sample in the optical$-K$ color by $0.13$~mag for Abell~370 and by $0.18$~mag for Abell~851. If real, the bluing of the E/S0 populations at moderate redshift is consistent with that calculated from the Bruzual and Charlot (1993) models of passive elliptical galaxy evolution. In both clusters the intrinsic scatter of the known E/S0s about their optical$-K$ color--mag relation is small ($\sim 0.06$ mag) and not significantly different from that of Coma E/S0s as given by Bower et al.\ (1992), indicating that the galaxies within each cluster formed at the same time at an early epoch.Comment: uuencoded gzipped tar file containing latex files of manuscript (42 pages) plus tables (9 pages); figures available by anonymous ftp at ftp://ipac.caltech.edu//pub/pickup/sed ; accepted for publication in the Ap

The K-selected Butcher-Oemler Effect

[abridged] We investigate the Butcher-Oemler effect in a sample of K-selected galaxies in 33 clusters at 0.15 < z < 0.92. We attempt to duplicate the original Butcher-Oemler analysis as closely as possible given the characteristics of our data. We find that the infrared selected blue fractions are lower than those measured in the optical and that the trend with redshift is much weaker. Comparison with optical data in clusters in common with Butcher & Oemler (1984) shows that infrared selection is the primary difference between our study and optically selected samples. We suggest that the Butcher-Oemler effect is in large part due to a population of star-forming low mass galaxies which will evolve into dwarf galaxies. These early results point to the need for larger and deeper infrared samples of cluster galaxies to address this issueComment: 37 pages, 19 figures, ApJ accepted (vol 598 n1

Forces generated during stretch in the heart of the lobster Homarus americanus are anisotropic and are altered by neuromodulators

Mechanical and neurophysiological anisotropies mediate three-dimensional responses of the heart of Homarus americanus. Although hearts in vivo are loaded multi-axially by pressure, studies of invertebrate cardiac function typically use uniaxial tests. To generate whole-heart length-tension curves, stretch pyramids at constant lengthening and shortening rates were imposed uniaxially and biaxially along longitudinal and transverse axes of the beating whole heart. To determine whether neuropeptides that are known to modulate cardiac activity in H. americanus affect the active or passive components of these length-tension curves, we also performed these tests in the presence of SGRNFLRFamide (SGRN) and GYSNRNYLRFamide (GYS). In uniaxial and biaxial tests, both passive and active forces increased with stretch along both measurement axes. The increase in passive forces was anisotropic, with greater increases along the longitudinal axis. Passive forces showed hysteresis and active forces were higher during lengthening than shortening phases of the stretch pyramid. Active forces at a given length were increased by both neuropeptides. To exert these effects, neuropeptides might have acted indirectly on the muscle via their effects on the cardiac ganglion, directly on the neuromuscular junction, or directly on the muscles. Because increases in response to stretch were also seen in stimulated motor nerve-muscle preparations, at least some of the effects of the peptides are likely peripheral. Taken together, these findings suggest that flexibility in rhythmic cardiac contractions results from the amplified effects of neuropeptides interacting with the length-tension characteristics of the heart

Modelling the spinning dust emission from LDN 1780

We study the anomalous microwave emission (AME) in the Lynds Dark Nebula (LDN) 1780 on two angular scales. Using available ancillary data at an angular resolution of 1 degree, we construct an SED between 0.408 GHz to 2997 GHz. We show that there is a significant amount of AME at these angular scales and the excess is compatible with a physical spinning dust model. We find that LDN 1780 is one of the clearest examples of AME on 1 degree scales. We detected AME with a significance > 20$\sigma$. We also find at these angular scales that the location of the peak of the emission at frequencies between 23-70 GHz differs from the one on the 90-3000 GHz map. In order to investigate the origin of the AME in this cloud, we use data obtained with the Combined Array for Research in Millimeter-wave Astronomy (CARMA) that provides 2 arcmin resolution at 30 GHz. We study the connection between the radio and IR emissions using morphological correlations. The best correlation is found to be with MIPS 70$\mu$m, which traces warm dust (T$\sim$50K). Finally, we study the difference in radio emissivity between two locations within the cloud. We measured a factor $\approx 6$ of difference in 30 GHz emissivity. We show that this variation can be explained, using the spinning dust model, by a variation on the dust grain size distribution across the cloud, particularly changing the carbon fraction and hence the amount of PAHs.Comment: 14 pages, 11 figures, submitted to MNRA

Postcard: Sunset Camp Store at Sunset Camp, Dodge City, Kansas

This black and white photographic postcard features the supply store at Sunset Camp in Dodge City, Kansas. A man stands in front of the store and a girl stands on the side of the building. Two men are working on the roof of the building behind the store that has Office painted on the side. A gas station is in the background. Written text is on the bottom of the card. Handwriting is on the back of the card.https://scholars.fhsu.edu/tj_postcards/1918/thumbnail.jp

Inclusionary Eminent Domain

This Article proposes a paradigm shift in takings law, namely “inclusionary eminent domain.” This new normative concept serves as a framework that molds eminent domain takings and economic redevelopment into an inclusionary land assembly model that is equipped with multiple tools to help guide municipalities, private developers and communities construct or preserve affordable housing developments. The tools to achieve this include Community Benefits Agreements (“CBAs”), Land Assembly Districts (“LADs”), Community Development Corporations (“CDCs”), Land Banks (“LABs”), Community Land Trusts (CLTs) and Neighborhood Improvement Districts (“NIDs”). The origins of the concept derive from the zoning law context, where exclusionary zoning in the suburbs excluded affordable housing for low-income residents. Courts intervened, applying exclusionary zoning doctrines, which led to the enactment of inclusionary zoning programs to achieve a fair share of housing. Exclusionary eminent domain in urban areas, similarly, has displaced and decreased the stock of or denied access to affordable housing through the power of takings. Under an exclusionary eminent domain doctrine, courts would apply heightened review to condemnations in a locality that has less than its fair share of affordable housing. But in a post-Kelo era of takings, doctrinal solutions may not be enough. Analogous to inclusionary zoning, inclusionary eminent domain helps us rethink how to fix these ubiquitous land problems. Indeed, this Article moves us beyond the doctrinal muddle and instead incorporates both the intellectual musings of takings and zoning law with an assessment of how innovative tools can be practically applied to construct and preserve affordable housing in eminent domain takings for economic redevelopment

The Fourth Amendment\u27s Constitutional Home

The home enjoys omnipresent status in American constitutional law. The Bill of Rights, peculiarly, has served as the central refuge for special protections to the home. This constitutional sanctuary has elicited an intriguing textual and doctrinal puzzle. A distinct thread has emerged that runs through the first five amendments delineating the home as a zone where rights emanating from speech, smut, gods, guns, soldiers, searches, sex, and self-incrimination enjoy special protections. However, the thread inexplicably unravels upon arriving at takings. There, the constitutional text omits and the Supreme Court’s doctrine excludes a special zone of safeguards to the home. This revelation raises unsettled questions as to why takings is the disjointed outlier. Prior scholarship has addressed this constitutional schism by observing that judicial deference to economic legislation, as opposed to exacting scrutiny to fundamental rights, has constrained the Court from extending the thread to takings. However, there are more unexplained scattered pieces to this constitutional puzzle that deserve further scholarly attention. This Article unearths another obscure schism in the thread of special protections to the home in the Fourth Amendment. While the Court’s solicitude of home protections remain unassailable in rights involving speech, smut, gods, guns, soldiers, sex and self-incrimination, notwithstanding takings, there has been an inconspicuous rollback—a doctrinal regression—of the home’s zone of special protections under the Court’s search and seizure doctrines. There, the Court has developed a patchwork of exceptions sanctioning greater government intrusions in the home. These exceptions that weaken home protections in the Fourth Amendment stand in stark contrast to the Court’s ironclad consistent homebound doctrines that shield the home in the rest of the Bill of Rights. Why, then, has the Court partially retreated from this special zone of rights and interests under its search and seizure doctrine, but nowhere else in the Bill of Rights? This Article is the first scholarly project to comprehensively catalogue and systematically survey the entire homebound Bill of Rights to reveal this doctrinal and textual discord presented by the Court’s partial backsliding from home protections in its searches and seizures jurisprudence. The Article excavates a variety of reasons and explanations for the notable discord and concludes by raising some theoretical and conceptual considerations for the doctrinal retrenchment

The contributions of motor neuronal and muscle modulation to behavioral flexibility in the stomatogastric system

The stomatogastric nervous system of crustaceans, which controls the four parts ofthe foregut, is subject to modulation at all levels, sensory, central and motor. Modulation of the central pattern generators, which are themselves made up largely of motor neurons, providesfor increased behavioral flexibility in a variety of ways. First, each of the pattern generators can be reconfigured to give multiple outputs. Second, the boundaries of the different pattern generators are in fact somewhat fluid, so that the neuronal composition of the pattern generators can be altered. For example, neurons can switch from one pattern generator toanother, or two or more pattern generators can fuse to generate an entirely new pattern and thereby produce a new behavior. The mechanisms responsible for many of these modulations include alterations of both intrinsic properties and synaptic interactions between neurons. In addition, the alteration of membrane properties contributes more directly to the behavioral output by changing action potential frequency. Finally, the muscles of the stomatogastric system can themselves be modulated, with the cpvl muscle, for example, becoming an endogenous oscillator in the presence of either dopamine or the peptide FMRFamide. © 1995 by the American Society of Zoologists

Large-scale wind-tunnel tests of descent performance of an airplane model with a tilt wing and differential propeller thrust

Wind tunnel tests of wing stall, performance, and longitudinal stability & control of large model v/stol tilt wing transport aircraf