scholarly journals Tuned muscle and spring properties increase elastic energy storage

2021 ◽  
Author(s):  
Elizabeth Mendoza ◽  
Emanuel Azizi
Keyword(s):  
Energy Storage ◽  
The Other ◽  
Elastic Recoil ◽  
Elastic Structures ◽  
Longus Muscle ◽  
Spring Force ◽  
Show Evidence ◽  
Tree Frogs ◽  
Muscle Changes ◽  
Effective Use

Elastic recoil drives some of the fastest and most powerful biological movements. For effective use of elastic recoil, the tuning of muscle and spring force capacity is essential. While studies of invertebrate organisms that use elastic recoil show evidence of increased force capacity in their energy loading muscle, changes in the fundamental properties of such muscles have yet to be documented in vertebrates. Here we used three species of frogs (Cuban tree frogs, bullfrogs, and cane toads) that differ in jumping power to investigate functional shifts in muscle-spring tuning in systems using latch-mediated spring actuation (LaMSA). We hypothesized that variation in jumping performance would result from increased force capacity in muscles and relatively stiffer elastic structures resulting in greater energy storage. To test this, we characterized the force-length property of the plantaris longus muscle-tendon unit (MTU), and quantified the maximal amount of energy stored in elastic structures for each species. We found that the plantaris longus MTU of Cuban tree frogs produced higher mass-specific energy and mass-specific forces than the other two species. Moreover, we found that the plantaris longus MTU of Cuban tree frogs had higher pennation angles than the other species suggesting that muscle architecture was modified to increase force capacity through packing of more muscle fibers. Finally, we found that the elastic structures were relatively stiffer in Cuban tree frogs. These results provide a mechanistic link between the tuned properties of LaMSA components, energy storage capacity and whole system performance.

The Cellular Origin in Atheromatous Lesion

1970 ◽  
Vol 28 ◽  
pp. 202-203
Author(s):  
T. M. Murad ◽  
H. A. I. Newman ◽  
K. F. Kern
Keyword(s):  
Smooth Muscle ◽  
Smooth Muscle Cells ◽  
Rabbit Aorta ◽  
Mixed Population ◽  
The Other ◽  
Cellular Origin ◽  
Ultrastructural Studies ◽  
Atherosclerotic Lesions ◽  
Show Evidence ◽  
Early Lesion

The origin of lipid containing cells in atheromatous lesion has been disputed. Geer in his study on atheromatous lesions of rabbit aorta, suggested that the early lesion is composed mainly of lipid-laden macrophages and the later lesion has a mixed population of macrophages and smooth muscle cells. Parker on the other hand, was able to show evidence that the rabbit lesion is primarily composed of lipid-laden cells of smooth muscle origin. The above studies and many others were done on an intact lesion without any attempt of cellular isolation previous to their ultrastructural studies. Cell isolation procedures have been established for atherosclerotic lesions through collagenase and elastase digestion Therefore this procedure can be utilized to identify the cells involved in rabbit atheroma.

Management of Hemophilia in France

1976 ◽  
Vol 35 (03) ◽  
pp. 553-558 ◽  
Author(s):  
Jean-Pierre Allain
Keyword(s):  
Home Care ◽  
Replacement Therapy ◽  
The Other ◽  
Blood Components ◽  
Careful Evaluation ◽  
Viii And Ix ◽  
Effective Use ◽  
General Care

SummaryTwo important factors concerning the management of hemophilia in France are considered.The supply of factors VIII and IX for replacement therapy meets the current demand but as the demand increases with the development of self-infusion programs, the production will also have to increase. This can only be done through more effective use of all of the blood components and will require careful evaluation of the needs of each patient.Programs which teach self-infusion and the other aspects of home care are gradually allowing the hemophiliac and his family better understanding of the disease. These programs are developing slowly in France but must be expanded to improve the general care of all French hemophiliacs.

scholarly journals Transduction mechanisms of bacteriophage ε15I. General properties of the system

1971 ◽  
Vol 18 (1) ◽  
pp. 9-19 ◽  
Author(s):  
R. W. Hedges
Keyword(s):  
High Frequency ◽  
Genetic Material ◽  
Recipient Strain ◽  
The Other ◽  
Donor Strain ◽  
General Properties ◽  
Show Evidence ◽  
Transduction Mechanisms ◽  
Defective Prophage

SUMMARYBacteriophageεγis capable of transduction both by replacement of a genetic segment of the recipient by the homologous genetic material from the donor strain and by the formation of defective transducing particles capable of lysogenizing the recipient strain ofS. anatum.The isolation of strains carrying such prophages, which have incorporated the lactose or arabinose operons, is reported. Lysogenic strains, carrying both normal and defective transducing prophage, form high-frequency transducing lysates. Other strains, carrying only defective prophage, show evidence that the association of prophage genes and transduced materials is stable since the loss of one frequently entails loss of the other.

the context of evidence from other spheres. This evidence of manipulation may correspond to increasing concern with the production of corporate descent groups, lineages or other communities or sub-groups as suggested by Robb (1994a: 49ff) for southern Italy and by others dealing with the Neolithic elsewhere (e.g. Chapman 1981 ; Thomas & Whittle 1986). This suggests different spatialities to those described for the earlier Epipalaeolithic burials, as does the evidence in much of Neolithic southern Italy for separation of activities such as not only the procurement but also the consumption of wild animals. Remains of these are extremely rare at most settlement sites, but evidenced at other locations whether associated with 'cults' e.g. the later Neoltihic (Serra d'Alto) hypogeum at Santa Barbara, (PUG: Geniola 1987; Whitehouse 1985; 1992; 1996; Geniola 1987), or at apparently more utilitarian hunting sites e.g. Riparo della Sperlinga di S. Basilio (SIC: Biduttu 1971; Cavalier 1971). One interpretation may wish to link these to newly or differently gendered zones or landscapes (see below). ART, GENDER AND TEMPORALITIES In southern Italy there is a rich corpus of earlier prehistoric cave art, parietal and mobiliary, ranging from LUP incised representations on cave walls and engraved designs on stones and bones; probable Mesolithic incised lines and painted pebbles; and Neolithic wall paintings in caves (Pluciennik 1996). Here I shall concentrate on two caves in northwest Sicilia; a place where there is both LUP (i.e. from c. 18000-9000 cal. BC) and later prehistoric art, including paintings in caves from the Neolithic, perhaps at around 6000 or 7000 years ago. These are the Grotta Addaura II, a relatively open location near Palermo, and the more hidden inner chamber of the Grotta del Genovese on the island of Levanzo off north west Sicilia. These are isolated, though not unique examples, but we cannot talk about an integrated corpus of work, or easily compare and contrast within a widespread genre, even if we could assign rough contemporaneity. Grotta dell'Addaura II Despite poor dating evidence for the representations at this cave, material from the excavations perhaps suggests they are 10-12000 years old (Bovio Marconi 1953a). Many parts of the surface show evidence of repeated incision, perhaps also erasure as well as erosion, producing a palimpsest of humans and animals and other lines, without apparent syntax. Most of the interpretations of this cave art have centred on a unique 'scene' (fig. 3) in which various masked or beaked vertical figures surround two horizontal ones, one (H5) above the other (H6), with beak-like penes or penis-sheaths, and cords or straps between their buttocks and backs. These central figures could be flying or floating, and have been described as 'acrobats'. Bovio Marconi (1953a: 12) first suggested that the central figures were engaged in an act of homosexual copulation, but later preferred to emphasise her suggestion of acrobatic feats, though still connected with a virility ritual (1953b). The act of hanging also leads to penile erection and ejaculation; and in the 1950s Chiapella (1954) and Blanc (1954; 1955) linked this with human sacrifice, death and fertility rites. All of these interpretations of this scene are generally ethnographically plausible. Rituals of masturbation (sometimes of berdaches, men who lived as women) are recorded from North America, where the consequent dispersal of semen on ground symbolised natural fertility (Fulton & Anderson 1992: 609, note 19). In modern Papua New Guinea ritual fellatio was used in initiation ceremonies as a way of giving male-associated sexual power to boys becoming men (Herdt 1984) and this ethnographic analogy has been used by Tim Yates (1993) in his interpretation of rock art in Scandinavia, which has figures with penes, and figures without: he argues in a very unFreudian manner that to be penis-less is not necessarily a female prerogative.

2016 ◽  
pp. 76-86
Keyword(s):  
Papua New Guinea ◽  
Southern Italy ◽  
The Other ◽  
Natural Fertility ◽  
Santa Barbara ◽  
North West ◽  
Show Evidence ◽  
Sexual Power ◽  
Compare And Contrast ◽  
Cave Art

scholarly journals Discovery of s-process enhanced stars in the LAMOST survey

2019 ◽  
Vol 490 (2) ◽  
pp. 2219-2227 ◽  
Author(s):  
Brodie J Norfolk ◽  
Andrew R Casey ◽  
Amanda I Karakas ◽  
Matthew T Miles ◽  
Alex J Kemp ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Selection Bias ◽  
Galactic Halo ◽  
Asymptotic Giant Branch ◽  
The Other ◽  
Data Driven ◽  
Giant Stars ◽  
Show Evidence ◽  
Data Driven Approach ◽  
Red Giant

ABSTRACT Here we present the discovery of 895 s-process-rich candidates from 454 180 giant stars observed by the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) using a data-driven approach. This sample constitutes the largest number of s-process enhanced stars ever discovered. Our sample includes 187 s-process-rich candidates that are enhanced in both barium and strontium, 49 stars with significant barium enhancement only and 659 stars that show only a strontium enhancement. Most of the stars in our sample are in the range of effective temperature and log g typical of red giant branch (RGB) populations, which is consistent with our observational selection bias towards finding RGB stars. We estimate that only a small fraction (∼0.5 per cent) of binary configurations are favourable for s-process enriched stars. The majority of our s-process-rich candidates (95 per cent) show strong carbon enhancements, whereas only five candidates (<3  per cent) show evidence of sodium enhancement. Our kinematic analysis reveals that 97 per cent of our sample are disc stars, with the other 3 per cent showing velocities consistent with the Galactic halo. The scaleheight of the disc is estimated to be $z_{\rm h}=0.634 \pm {0.063}\, \mathrm{kpc}$, comparable with values in the literature. A comparison with yields from asymptotic giant branch (AGB) models suggests that the main neutron source responsible for the Ba and Sr enhancements is the 13C(α,n)16O reaction. We conclude that s-process-rich candidates may have received their overabundances via mass transfer from a previous AGB companion with an initial mass in the range $1\!-\!3\, \mathrm{M}_{\odot }$.

Analysis of Thermal Performance of Energy Storage System

2016 ◽  
Vol 824 ◽  
pp. 371-378
Author(s):  
Martina Jurigova ◽  
Maria Minarova ◽  
Ivan Chmúrny
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
Storage System ◽  
Energy System ◽  
Energy Storage System ◽  
Advanced Technology ◽  
Winter Period ◽  
Concrete Tank ◽  
Effective Use

Thermal energy is necessary of many reasons. The most basic and most obvious includes food preparation and delivery of heat. Thermal energy storage is actually a temporary storage at high temperatures, respectively at low temperatures. It is an advanced technology, which can reduce environmental impact and it can facilitate more efficient and cleaner energy system. Nowadays, these systems have ability to retain thermal energy for a period of three months or more. The aim of design of these systems is to keep the thermal energy in summer period and to use it for heating in winter period. The role of such storage systems is to accumulate the heat, to balance temperature differences and to achieve the most effective use of the collected energy. This paper is focused on thermal analysis of system, which contains concrete tank. It is a system with water as a storage medium and the cooling of the water was monitored for 30 days.

scholarly journals Power Resilience Enhancement of a Residential Electricity User Using Photovoltaics and a Battery Energy Storage System under Uncertainty Conditions

Energies ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 4193 ◽  
Author(s):  
Nallapaneni Manoj Kumar ◽  
Aritra Ghosh ◽  
Shauhrat S. Chopra
Keyword(s):  
Energy Storage ◽  
Power Supply ◽  
The Other ◽  
Extreme Weather Events ◽  
Electric Grid ◽  
Power Outages ◽  
Power Outage ◽  
Battery Energy Storage ◽  
Residential Electricity ◽  
Battery Energy

Even in today’s modern electric grid infrastructure, the uncertainty in the power supply is more often seen and is mainly due to power outages. The reasons for power outages might be any of the following: extreme weather events, asset failure, natural disasters, power surges, acute accidents, and even operational errors by the workforce. Such uncertain situations are permitting us to think of it as a resilience problem. In most cases, the power outages may last from a few minutes to a few weeks, depending on the nature of the resilience issue and the power supply system (PSS) configuration. Therefore, it is imperative to understand and improve the resilience of a PSS. In this paper, a four-component resilience framework is proposed to study and compare the resilience of three different PSS configurations of residential electricity users (REUs) considering the realistic power outage conditions in the humid subtropical ecosystem. The proposed PSS configurations contain electric grid (EG), natural gas power generator (NGPG), battery energy storage (BES), and photovoltaics (PV) as the assets. The three PSS configurations of a REUs are EG + BES, EG + NGPG + BES, and EG + PV + BES, respectively, and in these, one REU is only the consumer and the other two REUs are prosumers. By using the proposed framework, simulations are performed on the three PSS configuration to understand the increasing load resiliency in the event of a power outage. Also, a comparative techno-economic and life cycle based environmental assessment is performed to select the most resilient PSS configuration among the EG + BES, EG + NGPG + BES, and EG + PV + BES for an REU. From the results, it was established that EG + PV + BES configuration would enhance the power resilience of an REU better than the other two PSS configurations. Besides, it is also observed that the identified resilient PSS configuration is cost-effective and environmentally efficient. Overall, the proposed framework will enable the REUs to opt for the PSS configuration that is resilient and affordable.

Flammability Study of Wallboard Containing Thermal Storage Materials. Methods to Improve Flame Retardancy of Treated Wallboard

1996 ◽  
Vol 14 (2) ◽  
pp. 128-143 ◽  
Author(s):  
R. Benrashid ◽  
M.W. Babich ◽  
G.L. Nelson
Keyword(s):  
Energy Storage ◽  
Coconut Oil ◽  
Thermal Storage ◽  
The Other ◽  
Energy Storage Materials ◽  
Undecylenic Acid ◽  
Scanning Calorimetry ◽  
Storage Materials ◽  
Radiant Panel ◽  
Smoke Chamber

The introduction of thermal storage materials into wallboard can help to control the temperature fluctuations in the heating and cooling of a building. Thermal storage materials absorb or release heat in defined tempera ture ranges. Wallboard was treated with thermal storage materials, including hexadecane, 1-dodecanol, undecylenic acid, coconut oil and silicone wax. These treatments involved absorption of the compounds into the wallboard. The de sired uptake of material into wallboard was approximately twenty-five percent. The uptake rate for silicone was lower than for the other materials. Most of the energy storage materials are organic, therefore their odor, smoke production, and flammability are a concern. The flammability properties of wallboard samples containing these materials were studied using the E-662 NBS Smoke Chamber and the E162 Radiant Panel Test. The results showed that silicone wax, undecylenic acid and coconut oil treated wallboard samples have superior flame retardent properties compared to wallboard treated with hexadecane, and 1-dodecanol. Silicone wax has a lower latent heat for the phase change as measured by differential scanning calorimetry (DSC) as compared with the other materials. To obtain better flammability properties of treated wallboard, the surface was coated with an epoxy paint containing aluminum trihydrate or magnesium hydroxide. Radiant Panel studies showed a major reduction in flame spread fac tor (Fs) and heat release factor (Q), compared to treated wallboard. However, NBS Smoke Chamber studies in the flaming and non-flaming mode did not show improvement in smoke generation for coated samples. NBS Smoke Cham ber results showed that silicone treated wallboard without any coating yielded lower smoke in the non-flaming mode over other energy storage materials, even when protected by a flame retardant paint. Dodecanol showed lower smoke pro duction in the flaming mode versus other samples.

Caring Relationships and Evidence-Based Practice: Can They Coexist?

2003 ◽  
Vol 7 (3) ◽  
pp. 46-50 ◽  
Author(s):  
Joanne R. Duffy,
Keyword(s):  
Patient Outcomes ◽  
Nursing Practice ◽  
The Other ◽  
Evidence Based ◽  
Caring Relationships ◽  
Intrapersonal Factors ◽  
Quality Health ◽  
Primary Focus ◽  
Quality Caring Model ◽  
Effective Use

Caring relationships are central to nursing practice and have been preliminarily tied to patient outcomes (Duffy, 1992; Issel & Kahn, 1998; Larson & Ferketich, 1999). The quality-caring model (Duffy & Hoskins, 2003) describes caring relationships as the primary focus of professional nursing. Through independent and collaborative professional encounters, caring relationships are initiated, cultivated, and sustained. The phases of interaction, connection, and knowing the other are explored and depicted. Intrapersonal factors, time, and effective use of the clinical caring processes are discussed in terms of their influence on developing caring relationships. As a result of model testing, evidence will be generated to guide clinical interventions and ultimately influence quality health outcomes.

scholarly journals Kinetic and e.p.r. studies of cyanide and azide binding to the copper sites of dopamine (3,4-dihydroxyphenethylamine) β-mono-oxygenase

1984 ◽  
Vol 220 (2) ◽  
pp. 447-454 ◽  
Author(s):  
N J Blackburn ◽  
D Collison ◽  
J Sutton ◽  
F E Mabbs
Keyword(s):  
Competitive Inhibition ◽  
Charge Transfer Band ◽  
The Other ◽  
Native Enzyme ◽  
Interacting Species ◽  
Other Hand ◽  
Show Evidence ◽  
Simultaneous Decrease ◽  
Copper Sites ◽  
Kinetics Of

The kinetics of inhibition of dopamine (3,4-dihydroxyphenethylamine) beta-mono-oxygenase by cyanide (CN-) and azide (N3-) ions have been investigated by using steady-state methods. Both anions show complex non-competitive-inhibition patterns with respect to ascorbate, suggestive of anion binding at two different sites on the oxidized enzyme. To further investigate this finding, e.p.r. titrations of CN- and N3- binding to the 63Cu-reconstituted enzyme were carried out. Addition of approx. 2 equiv. of CN- to copper elicits a new signal with g = 2.217, g = 2.025, A = 17.0 mT characteristic of a copper (II)-cyano complex. Simulations show that this signal accounts for half the copper (II) in the enzyme. The remainder of the enzyme-bound copper is expressed by a signal close to, but not identical with, that of native enzyme. Further addition of CN- induces a simultaneous decrease in intensity of both of these signals so that their 1:1 ratio is maintained. Binding of N3-, on the other hand, changes the e.p.r. spectrum to a form different from either that of the native or CN‒ -treated enzyme, and integrates to 100% of the copper in the enzyme (g = 2.252, g = 2.050, A = 16.5 mT). Resolved superhyperfine structure is apparent in the g region. N3- binding is also accompanied by the appearance of a broad charge-transfer band centred at 387 nm. Neither 9 nor 35 GHz e.p.r. spectra show evidence for more than one (non-interacting) species of Cu(II) in native enzyme and N3- derivatives. The binding and reactivity of CN-, on the other hand, argues against independent copper sites in the enzyme.

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