In univariable analyses patients age and sex did not influence

In univariable analyses, patients’ age and sex did not influence survival. Sheldon staging>IIIB or>IIIC rather than>IIIA was found to be significantly associated with poor patients’ survival. Similarly, Mayo staging>II was consequently found to be associated with shorter survival. Furthermore, Mayo staging was found to be superior to Sheldon staging in the prediction of survival [10,21]. Tumor grading proved to be associated with prognosis in the univariable but not in multivariable models [10,12,20,22,23,28]. The presence of LN and distant metastases were consequently associated with poor prognosis [12,23,28]. Information on surgical margin status was available in 4 studies and was constantly identified as a significant risk factor, underlining the importance of the complete tumor resection [10,12,23,24]. However, the performance of radical cystectomy compared with partial cystectomy provided no survival benefit [10,24]. Tumor size and the presence of signet ring differentiation were controversially reported as prognostic factors [10,21,22], whereas mucinous tumor HZ-1157 had no prognostic effect on survival [12,21]. ECOG performance status was tested in one study and was identified as an independent prognosticator for survival [22].
In multivariable analyses, Sheldon stage>IIIB, Mayo stage>II, presence of LN or distant metastases, positive surgical margin and ECOG performance status were identified as independent prognostic factors (Table 4). Further validation of these findings is necessary.

The recommended treatment for nonmetastatic UrC is surgery. Both partial and radical cystectomy can be considered as they provide similar oncological results [10,12,20,23]. However, organ preserving partial cystectomy provides higher quality of life and should therefore be preferred. As positive surgical margin is one of the most significant risk factors in UrC [10,12,24], en bloc resection with complete removal of urachal remnant and the umbilicus is essential for prolonged survival. To see whether these recommendations are followed in the clinical practice, we performed a summary on surgical treatment based on the initially selected 24 studies (Table 5). Data on surgical treatment were available for 957 patients. The majority (66%, 633/957) of patients was treated with partial cystectomy followed by radical cystectomy (12%, 117/957) and transurethral resection (5%, 49/957). Data on umbilectomy were published in 429 patients. In 287 (67%) of these cases, the removal of umbilical ligament with umbilicus has been performed (Table 5). These data are in accordance with the recommendations of the most authors; however, the importance of umbilectomy has to be clearly highlighted to further encourage its performance.
However, the prognostic effect of LND as an integral part of radical or partial cystectomy is controversial [10,24]. The removal of pelvic LN may be recommended considering the fact that LN positivity (without distant metastasis) showed a similar negative effect on survival as the presence of distant metastasis [12,23]. Therefore, the timely pathological detection of LN positivity may be essential for adequate staging, which in turn could influence treatment decisions. We found data on lymphadenectomy in 545 UrC patients. Of these, LND was performed in 248 cases (38%), reflecting current uncertainty regarding the benefit of lymphadenectomy. On the other hand, LN positivity was found in only 17% of cases. This relative low rate of LN positivity highlights the need for larger patient cohorts for the valid prognostic analysis of the potential benefit of lymphadenectomy and might explain why LND was not found to be prognostic in former studies.
As UrC is usually detected at progressed tumor stages, the rate of distant metastatic cases at diagnosis is relatively high (>20%). In addition, postoperative recurrence or metastatic progression are also frequent. In lack of effective radiotherapy, chemotherapy is the only treatment option to potentially prolong survival. However, the 5-year overall survival rate for UrC patients with metastatic disease is less than 20% clearly highlighting the need for more effective systemic therapy regimens [10,12]. Considering the low incidence of UrC, it is not surprising that no large-scale clinical studies have been performed to identify effective drugs for UrC. Therefore, most of the data are available from case reports using several various chemotherapy combinations and some studies with low case numbers not providing enough statistical power. Therefore, we summarized the available data to compare the efficacy of the most often used chemotherapeutic agents.

In any event the present

In any event, the present findings, coupled with Schenk’s (2012a) original observation that DF failed to scale her grasp to target width in the absence of any haptic feedback from the target, suggests that simple terminal information from contact with the object, rather than veridical haptic information about the object, is enough to keep the visuomotor networks in DF’s dorsal stream operating effectively – and that DF’s grip scaling, like that of healthy participants, chiefly relies on visual feedforward information. These findings are in agreement with the observation that intermittent haptic feedback from the goal object is sufficient to keep DF’s grip aperture tuned to the target’s visual width (Schenk, 2012a). Importantly, the present findings show that veridical haptic feedback about the target is not necessary to maintain grip scaling provided that the haptic and visual targets are coarsely co-localized (e.g. co-centred) and are highly similar in shape (e.g., cylinders that vary in diameter only, or simple rectangular and square blocks). Interestingly, if we accept that contact with the surface of the workspace constitutes terminal tactile feedback for target-directed grasps, then terminal tactile feedback can explain why DF continues to show significant grip scaling when reaching out to pick up 2D Efron shapes (Westwood et al., 2002). Terminal tactile feedback might influence two aspects of a target-directed grasp. First, it quinacrine might operate on top-down processes, minimizing cognitive supervision and preventing the participants from changing the way they approach the task. Second, terminal tactile feedback might operate on the bottom-up aspects of the programming of grasps. Presumably, contact with the visual target at the end of the grasping movement contributes spatial information about the width of the target and/or information about the timing of the finger contact with the target that the visuomotor system uses to update the programming of grip aperture for subsequent grasping movements.
In summary, the results of these experiments and our earlier work (e.g., Goodale et al., 1991; Whitwell et al., 2014) converge on the idea that DF’s spared visual control of grasping makes use of feedforward visual information in a manner similar to that in neurologically intact individuals. The results also suggest that the dorsal stream alone, without the help of form-processing areas in the ventral stream, is able to use tactile feedback about the width of the target to update the programming of grip aperture. Moreover, the clear dissociation between DF’s perceptual and visuomotor abilities in these experiments, coupled with evidence from other neuropsychological, neuroimaging, and neurophysiological studies (for review, see Goodale, 2011; Milner & Goodale, 2006, 2008; Westwood & Goodale, 2011), continues to provide strong support for the Two Visual Systems hypothesis. In short, the visual perception of objects relies on neural mechanisms that are to a large degree separate from those mediating the visual control of object-directed actions (Goodale & Milner, 1992).

This research was supported by grants from the Canadian Institutes for Health Research and the Canada Research Chair Program to MAG, post graduate doctoral awards from the Natural Sciences and Engineering Research Council of Canada and Ontario Graduate Scholarship Program to RLW, and an Early Career Award to CCP from the Wolfson Research Institute for Health and Wellbeing at Durham University. Finally, we extend a very special thank you to DF for her participation, interest, and patience throughout the test sessions.

The importance of vision to motor learning and control is somewhat obvious. Indeed, the seminal work of Woodworth (1899) proposed a role for vision in all aspects of movement – planning, control, and evaluation. Following from these original ideas, a multitude of behavioral studies that have affirmed Woodworth’s hypotheses and affirmed the role of vision in every aspect of motor learning and control.

Many strategies have been developed to

Many strategies have been developed to enhance homing of infused cells, either by modifying the pituitary adenylate cyclase-activating peptide or modifying the host tissues to stimulate stem cell recruitment (Prowse et al. 2011). The right combination of signaling molecules from the targeted tissues and corresponding receptors on the injected BMSCs is required for successful stem cell homing to specific tissues (Mendelson et al. 2014; Sarkar et al. 2011). Approaches that retain the receptors needed for efficient homing include pre-treatment of sub-cultured MSCs with cytokines (such as IL-6 and hepatocyte growth factor) (Fan et al. 2012; Hou et al. 2014), alteration of culture conditions (e.g., hypoxia and Sertoli cells) (Hung et al. 2007; Zhang et al. 2012), genetic manipulation of cell surface receptors (e.g., CXCR4 and integrin-α4) (Kumar and Ponnazhagan 2007; Liu et al. 2014) and modifications of cell surface chemokines that enhance interactions with activated capillary endothelium (Won et al. 2014). Although these modified MSCs may be well applied in in vitro experiments, secretion of endogenous inflammatory factors is necessary to induce cell tropism and targeting in vivo. Further investigation on the pituitary adenylate cyclase-activating peptide cell biology of MSCs after modification is needed. Approaches that modify targeted tissues to induce local inflammation and increase stem cell homing include local radiation therapy and pulsed focused ultrasound (Chang et al. 2013; Ziadloo et al. 2012). Although these methods are helpful in increasing the ability of BMSC to home to targeted tissues, they may be inconvenient, imprecise and potentially harmful to surrounding tissues.
Diabetic nephropathy is a kind of chronic inflammatory response in which the expression of chemoattractants (i.e., adhesion molecules, chemokines, cytokines and trophic factors) is minimal or absent in kidney tissues. Therefore, a pre-treatment strategy must be established to enhance migratory signals in diabetic kidney tissues without obvious injury. In this study, we found that MB-mediated diagnostic ultrasound irradiation could increase the engraftment of intravenously injected BMSCs by releasing various cytokines within a short time window of 48 h. These results can be explained by the reversible and non-destructive enhanced acoustic cavitation resulting from interactions between MBs and biological tissues. We hypothesize that the ruptured capillary walls and increased expression of cytokines may be factors that contributed to increasing the ability of BMSCs to home to targeted diabetic kidney tissues (Burks et al. 2013).
Because diagnostic ultrasound is used routinely in clinical settings and has real-time imaging capability (Yang et al. 2012), our experimental results may provide a basis for use of a combination of diagnostic ultrasound and MBs to enhance BMSC therapy in clinical applications. To apply this therapeutic modality to enhance BMSC treatment of human diabetic kidneys, some additional obstacles must be overcome. First, rats are small compared with human beings, so a new diagnostic ultrasound transducer should be designed to irradiate the whole human kidney to achieve optimal treatment. Second, we should optimize the parameters involved in diagnostic ultrasound-targeted MB destruction to achieve the maximum treatment. Third, further study is needed to clarify the precise morphology and molecular biological profile of MB-mediated diagnostic ultrasound irradiation-treated kidneys for clinical application.


Medical ultrasound is a widely established, powerful tool for diagnostic imaging applications. Combined with the use of microbubble contrast agents, it has been found to be a promising tool for drug delivery and therapeutic applications (Kang and Yeh 2011; Villanueva 2012). Microbubbles (MBs) are small (typically 2–3 μm in diameter) gas cores stabilized by a biocompatible shell and suspended in an aqueous dispersion. For lipid-based MB shells, changing the lipid type to be cationic, anionic or neutral can affect the bulk MB–cell interactions (Fisher et al. 2002). This, in turn, can have an overall effect on the suitability of MBs as a therapeutic agent (Xie et al. 2012) and provide another factor for improving targeted drug delivery. It is therefore important to be able to characterize the surface charge of the MB shell accurately. Current laser Doppler electrophoresis (LDE) methods for determining MB surface charge rely on measuring MB electrophoretic mobility in an electric field by light scattering and calculating its zeta potential (Malvern Instruments Ltd. 2004). The main limitation of this method is that the buoyancy force acting on the bubbles significantly affects the measurement, because of the vertical configuration of an LDE cell, often leading to inaccurate results.

br Methods br Results Spectra of the signal received by


Spectra of the signal received by the passive cavitation detector revealed a difference in cavitation dose for 0.45 and 1.5 MPa, with strong broadband noise at 1.5 MPa indicating inertial cavitation (Fig. 2). The opening of the BBB was confirmed with T1 contrast-enhanced MRI scanning. Figure 3 illustrates the biweekly BBB openings in the same mouse over 5 mo. With the ultrasound parameters used here, it was found that the BBB remained open for a maximum of 2 d, with complete closing on day 3 (see Supplementary Fig. 1, online only, available at The MRI rivastigmine tartrate agent gadolinium diffused efficiently throughout the targeted region of interest, and the opening was reproducible in each mouse after sonication throughout the week. The average opening volume (VBBB) was determined to be 26.4 ± 0.3 mm³.
No difference in overall behavior was observed because of the transient change from Definity to in-house manufactured polydispersed microbubbles between weeks 8 and 12 for the biweekly groups (p = 0.287). Because testing began at different times within the year for different groups, it was increasingly important for each group not tested on concurrent days to have a respective age-matched control group. The distance traveled in the open field for the biweekly and sham groups compared with their control remained consistent throughout the testing duration (Fig. 4a). The positive control exhibited a significant decrease in distance traveled (p < 0.05) when normalized and compared with that for the control (Fig. 4b). For the monthly groups and their respective controls, no difference was found in distance traveled (p = 0.429) when tested against time (Fig. 4c). An increase in overall movement was observed from testing week 0 to the week of sacrifice. Total mobility time (time during which the subject was moving) was insignificant for all biweekly groups except the positive control (p = 0.271, positive control: p < 0.01) (Fig. 5a). There was no decrease in mobility over time as assessed with the two-way repeated-measures analysis of variance against time. However, for the positive control, there was a significant decrease in movement after the first sonication (Fig. 5b), and there was no statistical significance found in subsequent weeks. The rotation differential, determined by the net difference between right and left turns (with the threshold for one turn determined by an angle of 120°), was found to be significant for the positive control, compared with their control group (p < 0.05), for the week after treatment (Fig. 5d). However, the following weeks were not significant (p = 0.151) when tested against all biweekly groups. Except for the positive control, all mice achieved proficiency in their ability to maintain balance and coordination on the rotarod task before exposure to FUS (Fig. 5b). After treatment, both monthly and biweekly mice were able to complete the task and remain on the rotarod for the expected duration of 180 s over the specified trials (p = 0.477). For the positive control, there was a significant decrease in the latency to fall off the rod (p < 0.05). Latency did, however, increase in the weeks after initial FUS treatment. Rearing, defined as the animal standing erect on hind legs, was recorded over the duration of the open-field task and was quantified and measured over time. There was no overall difference in rearing pattern or frequency, with most mice performing the task along the perimeter of the chamber. The positive control, however, did not perform the rearing pattern after the first sonication. Thigmotaxis, defined as the affinity of mice to remain near the perimeter of the open field, was examined for the second half of the open-field test. All treated groups and their controls exhibited similar travel patterns and explored the center of the open field (Fig. 6a, d). The positive control before sonication exhibited normal travel patterns associated with low anxiety; however, after sonication, the overall decrease in mobility reflected abnormal travel patterns (Fig. 6e, f). The sham mice displayed anxiogenic behavior (Fig. 6g, h), with decreases in weight, rearing and overall mobility during weeks 4 and 5 (Fig. 7). When each subject within the group was examined individually, only one did not display the decreased mobility and had an increase in weight. On the basis of societies observation, the non-anxiogenic subject, perceived to be the aggressor, was separated, and the remaining mice eventually were able to gain and maintain normal weight distribution based on age, as well as decreased anxiogenic behavior (Figs. 6g, h and 7).

br Methods br Results br Discussion Because the



Because the therapeutic strategies for AR and ATN differ, the RI, as a non-invasive ultrasound parameter, might provide little help in clinical decision making. Therefore, the uncertainty and controversy over using RI to diagnose kidney allograft AR prompted us to develop a better index. Acoustic radiation force impulse technology enables non-invasive quantification of tissue elasticity and is currently used in the assessment of liver stiffness in patients with chronic hepatitis and fatty liver; this method is closely dependent on histologic changes (Fierbinteanu-Braticevici et al. 2009; Friedrich-Rust et al. 2009). A clinical report in 2011 by Stock et al. included the ARFI-based tissue elasticity quantification for examination of kidney allograft dysfunction. The mean ARFI values exhibited an average increase of more than 15% in five acutely rejected kidneys, whereas no increase was observed in the other three dysfunctional kidneys, including two ATN cases and one drug-related toxicity case (Stock et al. 2011). In our study, we found a 16% significant increase in SWS in the acutely rejected kidneys compared with the non-AR kidneys, including stable functioning and ATN kidneys. Then, the subgroup analysis revealed that SWS distinguished the acutely rejected kidneys from the stable or ATN kidneys. These results suggest that SWS might be a reliable marker for R406 kidney allograft acute rejection.
In this study, SWE effectively diagnosed AR regardless of when it developed. When AR occurs at a very early stage post-transplantation, edema in the kidney is an important pathologic change. When AR occurs more than 1 mo post-transplantation, interstitial fibrosis and glomerular sclerosis can be observed in the kidney allograft rather than a wide range of interstitial inflammatory cells, and the vascular R406 is milder than that in kidneys rejected early (Vogler et al. 2007). The significantly elevated SWS value in our study indicates that the kidney allograft becomes stiffer when acute rejection occurs. To establish a reference range of AR prediction, we chose two cutoff values to identify the absence (<2.23 m/s) and presence (>2.90 m/s) of renal allograft AR. With these two cutoffs, approximately 36% of patients could be correctly diagnosed, with >81% accuracy.
In our study, kidney volume was significantly increased in the AR group. It is reported that patients with proven AR exhibit swelling of the renal pyramids (Gao et al. 2011). The kidney is surrounded by a tough fibrous capsule; hence, our results imply that an increase in intrarenal pressure during AR might be the cause of increased stiffness. In addition, it has been proposed that acute tubular necrosis is an important cause of delayed graft function. Compared with that in the acute rejected kidney, the kidney volume in the ATN group was significantly decreased. Possibly, the swelling of the pyramids in ATN is temporary and decreases after regeneration of the injured tubular epithelial cells, exerting little influence on the increase in renal cortex stiffness. However, the swelling of the renal pyramids that occurs in AR is caused by the intense reaction initiated by the immune response. Without appropriate and timely anti-rejection therapy, AR may persist or even increase. This might be the reason that SWS was significantly higher in the AR group than in the ATN group.
In addition, compared with other organs such as the liver and kidney in situ, the transplanted kidney is a better target organ for p-SWE assessment. Most transplanted kidneys are located in the iliac fossa. Because of the more superficial and consistent location, high-resolution images of transplanted kidneys can be obtained. In addition, the structure of the renal cortex and medulla is easily recognizable, so selecting a ROI in the renal cortex is easier, while avoiding the renal medulla. A study from Jean-Luc\’s group found that the anisotropic ratio had strong variations depending on the medulla observed, but the anisotropic ratio within the cortex remained constant with the increase of pressure (Gennisson et al. 2012). When renal ultrasound elastography is performed, clear identification of the renal segments and their orientation with respect to the ultrasound beam and the resulting shear wave propagation is mandatory (Gennisson et al. 2012). To increase the reliability of measurement, as well as reduce the effect of tissue anisotropy, we chose the middle part of the transplanted kidney as the representative ROI. This method had good reliability in terms of less intra-observer and inter-observer variability, as described in our previous study (He et al. 2014). In contrast to our study, Syversveen et al. (2011) reported very high intra-observer and inter-observer variability; they measured SWS in the middle and lower poles of the kidney, and not in a consistent location, which might explain the high variability. Consistently using the same location rather than different locations for the assessment of intra-observer and inter-observer variability is more reliable (Krouskop et al. 1998). Furthermore, compared with the upper pole and inferior pole of the kidney, the acoustic beam is usually perpendicular to the renal cortex in the middle part of the kidney with relatively constant measurement depth, making the measurement more reliable.

The proposed methodology overcomes some limitations

The proposed methodology overcomes some limitations of other available approaches. The method proposed by Chandra et al. (2011) requires manual initialization of both the mitral annulus and leaflets on multiple 2-D cut-planes from the 3-D TEE data set, resulting in pseudo-estimation of the 3-D orifice (given the use of 2-D cut-planes); it is also a time-consuming process (6 min for trained users). Conversely, our method operates directly on the 3-D TEE data set and involves minimal user intervention corresponding to location of the user-initialized seed point (x) and setting of the segmentation parameters, which requires up to 2 min per study for trained users. Moreover, differently from Moraldo et al. (2013), only one 3-D TEE systolic frame is required to compute the 3-D ARO, without making any assumption about the orifice shape. In addition, our algorithm makes use of existing technology for the acquisition of 3-D TEE data sets, and the segmentation is directly applied to the voids in the images representing the underlying anatomical structures containing the regurgitant orifice, with no need to acquire color-Doppler 3-D images as proposed by Grady et al. (2011).
Finally, the proposed approach based on 3-D TEE imaging represents an alternative to imaging modalities such as cardiac magnetic resonance and cardiac computed tomography. Despite being promising techniques, both methods are affected by through-plane motion during acquisition and require manual planimetry of the orifice, which can introduce intra- and inter-observer variability (Grayburn et al. 2012; Thavendiranathan et al. 2012). In addition, cardiac computed tomography is characterized by inadequate temporal resolution for the visualization of MR. Consequently, these methods cannot provide direct quantification of the 3-D morphology of the orifice and thus allow only qualitative or semi-quantitative assessment of the severity of MR.

In clinical biomechanics and human movement research, the timing of muscle contraction, or muscle onset (MO), is often used to examine the temporal relationship between external and internal events (e.g., electromechanical delay [Begovic et al. 2014], agonist/antagonist co-activation [Hortobagyi et al. 2009] or during the gait selective serotonin reuptake inhibitors [Powers et al. 1996]). Traditionally, surface and intramuscular electromyography (EMG) is used to measure MO; however, intramuscular EMG is an invasive procedure and surface EMG is a diffuse measure highly influenced by the activity of superficial muscle fibers (Farina et al. 2004).
The limitations of EMG have led many researchers to use musculoskeletal ultrasonography (US) to observe the mechanical displacement of deep muscles and associate this with muscle contraction (Begovic et al. 2014; Hodges et al. 2003; Pulkovski et al. 2008; Vasseljen et al. 2009). In US, transmitted and reflected ultrasonic waves (f ≥20 kHz) create a backscattering of waves resulting in a 2-D array of gray-scale values producing a typical sonogram image. In M-mode US, this image is updated hundreds of times per second to produce a time series of tissue displacement underneath the US probe. Processing of M-mode images for MO determination is often accomplished by leveraging techniques commonly applied to the EMG signal, such as high-pass (HP) filtering to remove artifact (Vasseljen et al. 2006, 2009). In most cases, the gold-standard method for MO determination is visual analysis, where investigators determine the time point of MO (Vasseljen et al. 2006, 2009; Westad et al. 2010). Although each study has reported good reliability for visual measurements (Pulkovski et al. 2008; Vasseljen et al. 2006, 2009), this method is time consuming, is highly dependent on the experience of investigators and may not be generalizable.
Alternatively, M-mode images can be processed via computer algorithms to detect when there is a change in pixel values (indicating movement initiation) across time. For example, Dieterich et al. (2015) developed a process using a method previously applied to EMG (Li et al. 2007; Solnik et al. 2010) by pre-conditioning US gray-scale values with the Teager–Kaiser energy operator (TKEO) (Kaiser 1990, 1993) and setting specified standard deviation threshold criteria for MO. The subsequent US-derived MO times were highly correlated (intra-class correlation coefficients [ICCs] = 0.73–0.93) with simultaneously recorded EMG-derived MO of the gluteus medius and gluteus minimus. Such automated detection techniques have the potential to replace tedious visual analyses. However, studies attempting to develop US-derived MO, whether visual or automated, often compare it with EMG-derived MO (Dieterich et al. 2015; Mannion et al. 2008; Pulkovski et al. 2008; Vasseljen et al. 2006, 2009). Given that EMG and ultrasound are two physiologically distinct measures, assuming that EMG can act as external validation of ultrasound-determined MO may not be appropriate (Vasseljen et al. 2006). To date, there has been no attempt to validate automated US MO techniques against the gold standard for US MO determination, visual analysis.

On the other hand knowledge of the chemical

On the other hand, knowledge of the chemical composition of the FeNP core is essential for the evaluation of these magnetic nanoparticles as targeted carriers of drugs. Depending on the details of the preparation method, different iron oxides can be present in the samples. Three of the most common are hematite (α-Fe2O3), maghemite (γ-Fe2O3), and magnetite (Fe3O4) [24]. Hematite is the most common iron oxide in nature because of its high thermodynamic stability, and maghemite is an important intermediate in hematite formation from the oxidation of magnetite precursors. Different studies [25–28] have demonstrated that Raman spectroscopy is a good tool for rapidly distinguishing iron oxides, hydroxides, and (oxy)hydroxides and, in our view, is a more powerful technique than X-ray diffraction. The Raman spectrum of hematite presents narrow bands at 225 (very strong), 247 (very weak), 292 (very strong), 411 (moderate), 496 (very weak), 610 (weak)cm−1. The Raman spectrum of magnetite presents an intense band at 668cm−1 and much smaller bands at 193, 306, and 538cm−1[29]. With regard to maghemite, the majority of authors take three broad maxima around 370, 500, and 710cm−1 as being indicative of maghemite.
We report here the development of multifunctional nanocarriers with a magnetic core and a biocompatible shell of buy HG-9-91-01 glycol (EG), with small amounts of folate and the anticancer agent cisplatin on the surface. These nanocarriers were synthesized in different ultrasonic fields (580, 861, and 1140kHz) and were characterized by different techniques.

Materials and methods

Results and discussion

We have developed a simple and direct route for the preparation of high performance FeNPs (nanocarriers) using ultrasound of different frequencies. These new multifunctional nanocarriers were composed of a magnetic core and a biocompatible shell (EG) with small amounts of cisplatin and folate. The sonochemical rate of oxidation of Fe2+ to Fe3+ was inversely proportional to the ultrasonic frequency, leading to an increased presence of Pt in the FeNPs. The mean size of the FeNPs was quasi-independent of frequency and the stabilizers forming the shell. The samples containing folate in the structure emitted a green fluorescence, a property that can be helpful for nanobiotechnological applications. All nanoparticles exhibited ferromagnetic characteristics at room temperature, with high Ms and low Hc and Mr values.


In recent years, less-invasive ablative modalities using thermal energy, such as laser, focused ultrasound, microwave, and radiofrequency ablations, have received considerable attention, especially for localized tumor ablation [1–6]. To expand potential applications and avoid in vivo experiments or human experimentations, the design and processing of transparent tissue-mimicking phantoms capable of demonstrating the evolution and extent of thermal lesion formation in real time are extremely helpful for all ablative devices during preclinical development.
Several temperature-sensitive tissue-mimicking phantoms have been reported as model materials for ablative therapy. For example, polyvinyl alcohol (PVA) or agar-based phantoms were used to visualize the effect of bubble-enhanced heating by focused, MHz-frequency ultrasound [7]. However, thermal lesions could not be well visualized in such phantoms. Transparent polyacrylamide (PAA) gels containing bovine serum albumin (BSA) were then proposed since BSA would turn white and optically opaque or reduce the T2 signal on magnetic resonance imaging upon reaching the threshold temperature of protein denaturation [8–10]. Takegami et al. demonstrated a low-cost version by replacing BSA with egg white for the study of focused ultrasound ablation [11]. Although easily fabricated, the major disadvantages associated with egg white or albumin-based tissue-mimicking phantoms are the irreversible protein denaturation and permanent color change above the threshold temperature, making them impossible to be reused.

As explained in Section the alkali

As explained in Section 1, the alkali elements are present in three forms: (1) water-soluble, (2) ion-exchangeable, and (3) fixed. In this MK-571 sodium salt hydrate manufacturer methodology, only water-soluble alkalis were removed during washing since no chemicals were deployed for leaching other forms of alkalis. Water-soluble alkalis are present on the surface of coal particles and are easy to remove by washing with water. Hence, the ultrasonic removal of alkalis presents no significant benefits over stirring. In order to demonstrate the true effectiveness of acoustic methods, chemical washing by stirring and ultrasound are carried-out.
Fig. 6 depicts the results of ultrasonic removal of alkali elements by chemical leaching in comparison with stirring. It may be inferred from the graphs that the ultrasonic chemical washing shows a dramatic improvement in the removal of sodium in both tested coals. Coal A showed three times increase in percentage removal of sodium by ultrasonic-chemical washing (∼85%) compared to chemical stirring (∼30%). A similar intensification by ultrasound was observed in coal B as well.
Such observations confirm the intensifying effect of ultrasonic washing, similar to the observations of Ambedkar et al. [18]. This proves that due to the sequential action of cavitation and streaming phenomena, chemicals are able to penetrate into the pores of coal particles where the ion-exchangeable sodium is present. A four-stage mechanism that enhances the leaching of sodium in the presence of ultrasounds has been proposed, and involves pitting of coal surfaces, formation of cracks, penetration of cracks into coal particles, and breakage of coal particles [19,22]. Hence, the sequential exposure of ultrasonic waves of 25kHz and 430kHz is more effective in removing the bonded sodium elements compared to agitation. These preliminary results on ultrasonic removal of sodium are encouraging, warranting further studies and scale-up investigations.
The removal of potassium, however, is not enhanced in the presence of ultrasonic waves and an ion-exchanger. This is attributed to the chemical nature of potassium elements in coals. Potassium is bonded with silica in the form of potassium silicate, and hence, strong acids, such as hydrofluoric acid, are required to react with it [16]. Contrary to potassium, a significant amount of sodium is available in organically-bonded form and is therefore removable by ammonium acetate. The removal efficiency in terms of mg of Na removed per kJ of energy supplied for the processing time of 30min was calculated. In presence of ammonium acetate, coal A and B showed removal efficiencies of 0.003 and 0.02mg of Na removed/kJ for ultrasonic washing and 0.004 and 0.02mg of Na removed/kJ for stirring, respectively. Though stirring requires lesser energy to leach compared to ultrasound, it is of the same order of magnitude in terms of energy consumption.

A preliminary study on the effect of low (25kHz) – and high-frequency (430kHz) ultrasound waves in removing alkali elements – elements responsible for formation and growth of fouling deposits – from coals was conducted. Two methodologies (agitation and sonication) of plain water-washing and chemical-washing were employed in order to remove the water-soluble alkalis and ion-exchangeable alkalis, respectively, of coals. In water-washing, both agitation and ultrasonic washings lead to similar removal efficiencies. In chemical washing – using ammonium acetate – ultrasonic washing showed a significantly enhanced removal efficiency of sodium compared to agitation. The reason for the enhanced efficiency lies in the removal of ion-exchangeable alkalis, where ultrasonic cavitation and streaming phenomena were able to enhance the penetration of the chemical into pores in the coal matrix. It has been further inferred that removal efficiencies (mg of sodium removed per kJ of energy supplied) for ultrasonic chemical washing are 0.003 and 0.02, while for stirring are 0.004 and 0.02. Hence, ultrasonic chemical-washing may be employed in a coal-fired power plant to contain severity of fouling deposits.

rifampicin To find out the factors which

To find out the factors which weaken the memory effect, we thus tracked the small air bubbles that formed just after the transducer is turned off. When the transducer is turned off, cavitation bubbles will stop radial vibration, air bubbles of different size will be formed in the liquid. It was found in the experiments that almost all the recognizable air bubbles moved very fast just after turning off the transducer. The direction and velocity of these movements were different in different position of liquid layer for each experiment. The velocity of these movements decreased rapidly to zero (or nearly zero). Then these air bubbles began to slowly float upward (the thin liquid layer was placed vertically in the chamber). Fig. 7 shows the motion of a typical air bubble which was caught by high-speed camera when turning off the transducer. The image that shows the trajectory of the air bubble (as shown in Fig. 7(b)) is a composite image of superimposing 16 high-speed photos (Fig. 7(a) is one of the photos) of the air bubble at typical position. The air bubble moved from A to B along the circular path in 50ms, from B to C in 350ms. The air bubble moved further and further away from the original location. Because these small air bubbles will become cavitation bubbles or bubble clusters when turning on the transducer, the motion of air bubbles inevitably change the distribution of cavitation bubble clusters and weaken the memory effect.
The air bubbles are not subjected to the action of acoustic rifampicin force or acoustic streaming when the transducer is turning off. The high-velocity motion of these air bubbles in the experiment is due to hydrodynamic force. If the gap distance is large enough, the air bubbles which are formed just after the transducer is turned off will stay at original position without high-velocity motion [15]. The sound field distribution in the thin liquid layer is very complicated. The sound field distribution will also vary with time. So the cavitation bubbles in the thin liquid layer will never collapse at the same time. Some bubbles are in the phase of growth, and some bubbles are in the phase of collapse at any time (as shown in the Fig. 3 (a)). This means there is a non-zero cavitation bubble volume ratio at any time. When the transducer is turned off all the cavitation bubbles will stop radial vibration. The variation of bubble cluster volume will cause fluid and air bubbles motion. If the gap distance is large enough, the variation of bubble cluster volume is too small (compare to the fluid volume in layer) to cause fluid and air bubbles motion.

Discussions and conclusions
The cavitation nuclei can be reordered by the motion of cavitation cluster (as shown in the Fig. 4 (τ=1313ms, τ=4757ms)). It is a spontaneous process caused by the interaction of cavitation bubble cluster and acoustic field. However, if we can control artificially the distribution of cavitation bubbles cluster, we can control the distribution of cavitation nuclei (by the memory effect). Two experiments give some hints towards the control of cavitation cluster distribution. Fig. 8(a) shows a thread in the thin liquid layer. As can be seen from the figure, cavitation bubble cluster tend to adhere to the thread, and the circular non-cavitation area is separated by the thread. Fig. 8(b) shows the process of a liquid jet shooting into the liquid layer. The liquid jet brings many new nuclei and form cavitation cluster in the incoming liquid. In this way Nucleolus is possible to produce cavitation bubble cluster in particular position. In turn, the uneven distribution of nuclei can lead to the formation of cavitation bubble cloud with specific structure in a short time (several milliseconds) (as shown in the Figs. 4 and 5).

Theoretical interest in single cavitation bubble traces back to the last century [1]. The researches in this field usually focused on the damage or erosion caused by cavitation bubbles [2–5]. Some new research directions were proposed such as ultrasonic cleaning [6,7] and shock-wave lithotripsy [8] in recent years. The high-speed photography technology was generally used to detect the short duration of cavitation bubble process. Yang [2], Xu [9], and Zhao [10] employed high-speed photography and acoustic measurements technology to study the dynamic characteristics of cavitation bubbles near boundaries. Later on, Xu et al. improved the high-speed photography technology to observe the change process of the jet and reversed jet [11].

order bupropion hydrochloride The lattice Boltzmann method LBM has

The lattice Boltzmann method (LBM) has been developed as a technique for modeling fluid flow and has proved to be particularly advantageous for simulating binary-fluid mixtures [13–15]. It has also been shown that the LBM can be applied to simulate acoustic waves [16] and the interaction between acoustic and velocity fields [17,18]. Many research have used LBM to investigate emission and reflection in variable sound field [19]. Then they also considered the propagation of an acoustic wave or pulse in an immiscible binary fluids with different speeds of sound for each component [20]. Yong Shi et al. [21] made LBM to tackle the classical problem of sound order bupropion hydrochloride directivity of pipes issuing subsonic mean flows. The investigations are focused on normal mode radiation, which allow the use of a two-dimensional lattice with an axisymmetric condition at the pipe’s longitudinal axis.

The mathematical model and numerical algorithm

Acoustic model
The acoustic wave can be introduced into this model provided the pressure variations remain small relative to the ambient pressure [16,29,30]. The LBM applied here has the speed of . The acoustic pressure is found from the equation of the state: . The ultrasound field is introduced at the grid boundaries parallel to . This is done by setting the values of , where and are the acoustic density and velocity at the boundary. A square grid was used with an integer number of wave-lengths in each direction. The values of the acoustic density and velocity are therefore given by and for standing wave, and and for traveling wave, where is wave number and is the ambient density; and are the amplitudes of the density and velocity variations, respectively.

Simulation results and discussion
After ultrasound irradiated an emulsion prepared with canola oil and deionized water experimentally, the emulsion splitting can successfully be enhanced into oil and water [33,12]. Dispersed behaviors of droplets under ultrasonic irradiation have been observed by experimental method. Dispersed droplets immediately aggregated and checkered pattern consisting of the aggregation appeared after irradiation. The ultrasound helped to the aggregation rather than larger droplets under the given conditions, such as frequency and intensity of ultrasound field. We summarized several characteristics of separation phase patterns as follows: a) The vertical stripe patterns appeared on the walls of container and a larger of clear oil was found on the top of the emulsion in higher frequency case. It indicated that the higher degree of separation was appeared at transducer and reflector. b) Middle layer was cream which was lighter than the bottom one containing a compact amount of merged droplets. This showed the size of separated oil droplets in the middle of system was smaller than that near the sound source and reflector. c) For the effect of frequency on the separation, higher frequency irradiation helped to form stripe aggregation in middle layer, while more dispersed small droplets were created in small frequency case. Our simulations will present a comparison between the experimental and simulative results [12,34], and exploration in the further work.
Dimensionless quantities must be used to convert between the lattice units of the simulation and standard international units (SI units) which are used to interpret the results. An example of how this is done is presented in this here, as in the rest of the paper, where subscripts s and r are applied to quantities in lattice Boltzmann units and real world values, respectively. Consider the simulation with , , , and , where the speed of sound is . Then the acoustical Reynolds number defined as gives: . Thus , corresponding to a frequency of , and a period of . Now, comparing the wave period and the wavelength we see that 1732 time-steps (each time step represents ) and 1000 lattice spaces . The intensity of the ultrasound beam can be found from , calculated as above, using the formula: [35]. For sound waves with a large density variation, at 160dB, the relative density variation is 0.02 of the mean density, and the resulting sound waves to exhibit non-linear effects [36,37]. In order to take account of both accuracy and stability, density amplitude will be chosen for all simulations.