Early culture of the American Atlantic sturgeon Acipenser oxyrinchus oxyrinchus Mitchill, 1815 and preliminary stocking trials

We performed rearing studies with first-feeding fry and fingerling American Atlantic sturgeons Acipenser oxyrinchus oxyrinchus Mitchill, 1815 of Hudson River parentage. Sturgeons were reared at initial densities of 3.7-22.2 fish/l and offered live Artemia sp., frozen Artemia sp., or a formulated diet (Biokyowa). After 26 days, mean specific growth rate was inversely proportional to fish density and ranged from 4.9-11.1% per day. Fish fed frozen artemia were smaller but had the same survival rate as those fed live artemia. Sturgeons converted to a formulated diet with 25 % mortality at mean length and weight (sd) of 34.5 mm (3.0) and 182 mg (50). Treatments of fingerlings established at initial densities of 0.37-2.22 g/l and fed a formulated diet (Zeigler) for 28 days exhibited mean percent survival (sd) of 87.0 (0.0) to 93.3 (2.3) and had feed conversion factors of 0.50 or less. Our study showed that first-feeding American Atlantic sturgeons require low initial rearing densities (7.4 fish/l or less) and 20-26 days of continuous live artemia to facilitate conversion to formulated feed. Fish reared similarly were released into the Hudson River in 1994 and into the Nanticoke River (a Chesapeake Bay tributary) in 1996 to evaluate survival and estimate wild recruitment. Sampling in the Hudson River from 1995 through 1997 showed that hatchery fish comprised 35-53% of the total juvenile catch. Evaluation of fish released in the Nanticoke River from 1996 through 1998 showed that hatchery fish spread throughout Chesapeake Bay, made up 62 % of the total American Atlantic sturgeon catch, and had similar length-weight relationships as wild fish.Hemos realizado estudios de cultivo con juveniles en estadios iniciales y más avanzados de esturión atlántico americano Acipenser oxyrinchus oxyrinchus Mitchill, 1815 de linaje procedente del río Hudson. Los esturiones fueron cultivados a densidades iniciales de 3,7-22,2 peces por litro y alimentados con Artemia sp. viva, Artemia sp. congelada, o con una dieta formulada (Biokyowa). Después de 26 días, la tasa específica de crecimiento media fue inversamente proporcional a la densidad de peces y varió entre 4,9-11,1% por día. Los peces alimentados con artemia congelada fueron más pequeños, pero tuvieron la misma tasa de supervivencia que los alimentados con artemia viva. Los esturiones transformaron una dieta formulada con menos de 25 % de mortalidad a una longitud y peso medios de 34,5 mm (desviación típica = 3,0) y 182 mg (50). Los tratamientos de estadios más avanzados, establecidos a densidades iniciales de 0,37-2,22 g/litro y alimentados con dieta formulada (Zeigler) durante 28 días, exhibieron un porcentaje de supervivencia medio entre 87,0 (d.t. = 0,0) y 93,3 (2,3) y fueron alimentados con factores de conversión de 0,50 o menores. Nuestro estudio mostró que los juveniles en estadios iniciales de esturión atlántico americano requieren densidades de cultivo iniciales bajas (7,4 peces/litro o menores) y 20-26 días seguidos de artemia viva para facilitar la conversión a dieta formulada. Peces cultivados de este modo fueron soltados en el río Hudson en 1994 y en el río Nanticoke (un afluente de la bahía Chesapeake) en 1996 para evaluar su supervivencia y estimar el reclutamiento silvestre. El muestreo en el río Hudson desde 1995 a 1997 mostró que los peces cultivados supusieron el 35-53% de las capturas totales de juveniles. La evaluación de los peces soltados en el río Nanticoke desde 1996 a 1998 mostró que los peces cultivados se distribuyeron hacia la bahía Chesapeake, suponiendo el 62 % de las capturas totales de esturión atlántico americano, y tuvieron similares relaciones longitud-peso que los peces silvestres.Instituto Español de Oceanografí

Exotic Tetraquark states with two bˉ\bar{b}-quarks and JP=0+J^P=0^+ and 1+1^+ BsB_s states in a nonperturbatively-tuned Lattice NRQCD setup

We use $n_f=2+1$ Wilson-clover gauge-field ensembles from the CLS consortium in a Lattice NRQCD setup to predict the binding energy of a $I(J^P)=0(1^+)$ $ud\bar{b}\bar{b}$ tetraquark and a $\frac{1}{2}(1^+)$ $\ell s\bar{b}\bar{b}$ tetraquark. We determine the binding energies with respect to the relevant $BB^*$ and $B_sB^*$ thresholds respectively to be $112.0(13.2)$ MeV for the $ud\bar{b}\bar{b}$, and $46.4(12.3)$ MeV for the $\ell s\bar{b}\bar{b}$. We also determine the ground-state $J^P=0^+$ $B_{s0}^*$ and $1^+$ $B_{s1}$ mesons to lie $75.4(14.0)$ and $78.7(13.9)$ MeV below the $BK$ and $B^*K$ thresholds respectively. Our errors are entirely dominated by systematics due to discretisation effects. To achieve these measurements, we performed a neural network based nonperturbative tuning of the Lattice NRQCD Hamiltonian's parameters against the basic bottomonium spectrum. For all lattice spacings considered we can reproduce the continuum splittings of low-lying bottomonia. It is worth remarking that our nonperturbative tuning parameters deviate from 1 by significant amounts, particularly the term $c_2$.Comment: 48 pages, 16 figure

Charmonium mass splittings at the physical point

We present results from an ongoing study of mass splittings of the lowest lying states in the charmonium system. We use clover valence charm quarks in the Fermilab interpretation, an improved staggered (asqtad) action for sea quarks, and the one-loop, tadpole-improved gauge action for gluons. This study includes five lattice spacings, 0.15, 0.12, 0.09, 0.06, and 0.045 fm, with two sets of degenerate up- and down-quark masses for most spacings. We use an enlarged set of interpolation operators and a variational analysis that permits study of various low-lying excited states. The masses of the sea quarks and charm valence quark are adjusted to their physical values. This large set of gauge configurations allows us to extrapolate results to the continuum physical point and test the methodology.Comment: 7 pp, 6 figs, Lattice 201

Low lying charmonium states at the physical point

We present results for the mass splittings of low-lying charmonium states from a calculation with Wilson clover valence quarks with the Fermilab interpretation on an asqtad sea. We use five lattice spacings and two values of the light sea quark mass to extrapolate our results to the physical point. Sources of systematic uncertainty in our calculation are discussed and we compare our results for the 1S hyperfine splitting, the 1P-1S splitting and the P-wave spin orbit and tensor splittings to experiment.Comment: For the Fermilab Lattice and MILC Collaborations; 7 pages, 6 figures; Contribution to the 32nd International Symposium on Lattice Field Theory, 23-28 June, 2014, Columbia University New York, N

Defective interactions of protein partner with ion channels and transporters as alternative mechanisms of membrane channelopathies

AbstractThe past twenty years have revealed the existence of numerous ion channel mutations resulting in human pathology. Ion channels provide the basis of diverse cellular functions, ranging from hormone secretion, excitation–contraction coupling, cell signaling, immune response, and trans-epithelial transport. Therefore, the regulation of biophysical properties of channels is vital in human physiology. Only within the last decade has the role of non-ion channel components come to light in regard to ion channel spatial, temporal, and biophysical regulation in physiology. A growing number of auxiliary components have been determined to play elemental roles in excitable cell physiology, with dysfunction resulting in disorders and related manifestations. This review focuses on the broad implications of such dysfunction, focusing on disease-causing mutations that alter interactions between ion channels and auxiliary ion channel components in a diverse set of human excitable cell disease. This article is part of a Special Issue entitled: Reciprocal influences between cell cytoskeleton and membrane channels, receptors and transporters. Guest Editor: Jean Claude Herv

SELTEC: Service and Experiential Learning Through Engagement in the Community: A Level I Fieldwork Model: Part 1

Securing effective and quality fieldwork experiences is an area of concern in occupational therapy education. Academic Fieldwork Coordinators and occupational therapy programs are looking for new models and innovative methods of instruction to provide fieldwork experiences to students. A team of occupational therapy faculty developed and implemented an innovative Level I fieldwork model called Service and Experiential Learning Through Engagement in the Community (SELTEC). The model incorporates service and experiential learning while engaging the occupational therapy program and faculty educators in the community. The SELTEC model utilizes the student, educational system, and community to promote a service relationship to provide effective quality fieldwork education. The objective of the paper is to a) introduce the SELTEC model units and principles, and b) provide the application of the model across three practice areas. The model serves as a solution for occupational therapy programs by providing Level I fieldwork experiences within strategic clinical partnerships while utilizing faculty-led instruction to facilitate peer-to-peer, experiential, and service learning opportunities during fieldwork education

SELTEC: Service and Experiential Learning Through Engagement in the Community: A Level I Fieldwork Model: Part 2

The SELTEC model of Level I fieldwork was developed and published in 2020. The SELTEC model combines service and experiential learning to benefit student learners, the educational system, and the community. The purpose of the study was to determine students’ perceptions of a SELTEC model experience compared to a traditional Level I fieldwork experience. The research team administered a 24-item survey to thirty students who participated in the study. All participants received both a traditional one-week and SELTEC level I fieldwork experience during their occupational therapy education at Arkansas State University. Seventy-nine percent (n=23) of the respondents selected the SELTEC model to meet the question criteria the majority of the time, while 20% (n=6) selected the traditional experience. The study results indicate that the SELTEC model was preferred over the traditional FW model. The results show the experiences offered in the SELTEC model prepare students for occupational therapy practice in ways not offered in a traditional FW model

The contributions of visual flow and locomotor cues to walked distance estimation in a virtual environment

Traversed distance perception involves estimating the extent of self-motion as one travels from one position in space to another. As such, it is a multi-modal experience in which information from both visual flow and locomotor cues (i.e. proprioceptive, efference copy and vestibular cues) jointly specify the magnitude of self-motion. While recent evidence has demonstrated the extent to which each of these cues can be used independently to estimate traversed distance, relatively little is known about how they are integrated when simultaneously present. Evaluating multi-modal cue integration in the context of dynamic locomotor behaviour is important to both understanding issues related to self-motion perception, as well as perceptual-motor coupling in real and virtual environments

Vector magnetometer design study: Analysis of a triaxial fluxgate sensor design demonstrates that all MAGSAT Vector Magnetometer specifications can be met

The design of the vector magnetometer selected for analysis is capable of exceeding the required accuracy of 5 gamma per vector field component. The principal elements that assure this performance level are very low power dissipation triaxial feedback coils surrounding ring core flux-gates and temperature control of the critical components of two-loop feedback electronics. An analysis of the calibration problem points to the need for improved test facilities

Enriched Tai Chi (ETC) Program Enhances Quality of Life for Older Adults in Assisted Living Facility: Feasibility Study

Background: Older adults living in assisted living facilities (ALFs) are at risk for physical and mental health decline that precipitates nursing home placement. There is a need for an exercise program that improves the quality of life (QOL) for older adults living in the ALFs. This study’s primary purpose was to investigate the feasibility of an Enriched tai chi (ETC) intervention program on improving the QOL of older adults living in an ALF. Method: A convenience sample of six older adults living in the same ALF attended the ETC program for 16 consecutive sessions two times per week for 8 weeks. A pre-test and post-test one-group design was used. The 36-Item Short Form Survey and the Beck depression inventory were used to measure QOL and mood at baseline, the 4th week, and the 8th week of the study. Results: Wilcoxon sign rank test on pre and postintervention SF-36 scores were significant (p \u3c .05). Pre-test and post-test intervention changes in mood were significantly improved (BDI; p \u3c .05). Conclusion: These findings suggest the ETC program may be a feasible intervention to improve the QOL of older adults in ALFs, warranting the need for further research