An approach to growth of Fe-Si multilayers with controlled composition profile-a way to exchange coupled thin films.

The growth, composition and structure of sandwich structures (Fe-rich layer/Si-rich layer/Fe-rich silicide layer) grown on a Si(111) surface were studied by a few complementary microscopic and spectroscopic techniques with high spatial resolution. Intermixing at the Fe/Si and Si/Fe interfaces is demonstrated. Fe-rich layers grown directly on the Si(111) surface are crystalline and have abrupt but rough interfaces at both sides. The succeeding layers are disordered and their interfaces are fuzzy. The distributions of Fe and Si within the layers are laterally non-uniform. The reproducible fabrication of thin non-magnetic silicide spacers of predetermined thickness is demonstrated. Sandwich structures with such spacers exhibit exchange coupling between ferromagnetic Fe-rich layers.

Improving the detection of hypo-vascular liver metastases in multiphase contrast-enhanced CT with slice thickness less than 5 mm using DenseNet.

INTRODUCTION: Thinner slices are more susceptible in detecting small lesions but suffer from higher statistical fluctuation. This work aimed to reduce image noise in multiphase contrast-enhanced CT reconstructed with slice thickness thinner than the clinical setting (i.e., 5 mm) using convolutional neural network (CNN) for enabling better detection of hypo-vascular liver metastasis. METHODS: A DenseNet model was used to generate noise map for multiphase CT reconstructed with slice thickness of 2.5 mm and 1.25 mm. Image denoising was conducted by subtracting the CNN-generated noise map from CT images with reduced photon flux due to thinner slice thickness. The performance of DenseNet was evaluated on CT scans of electron density phantoms and patients with hypovascular liver metastases less than 1.5 cm in terms of Hounsfield Unit (HU) variation, statistical fluctuation, and contrast-to-noise ratio (CNR). RESULTS: The phantom study demonstrated that the CNN-based denoising method was able to reduce statistical fluctuation in CT images reconstructed with slice thickness of 2.5 mm and 1.25 mm without causing significant edge blurring or variation in HU values. With regards to patient study, it was found that the denoised 2.5-mm and 1.25-mm slices had higher CNR than the conventional 5-mm slices for hypo-vascular liver metastases in all 4 phases of multiphase CT. CONCLUSION: Our results demonstrated that the detection of hypo-vascular liver metastases in multiphase contrast-enhanced CT with slice thickness less than 5 mm could be improved by using the CNN-based denoising method. IMPLICATIONS FOR PRACTICE: Reconstruction slice thickness has a strong influence on the image quality of CT imaging. A CNN-based denoising method was used in this work to reduce the image noise in multiphase contrast-enhanced CT reconstructed with slice thickness less than 5 mm.

Comparative in vitro cytotoxicity study on uncoated magnetic nanoparticles: effects on cell viability, cell morphology, and cellular uptake.

Magnetic iron oxide nanoparticles (MIONPs) must be biocompatible, and a thorough knowledge on their potential cytotoxicity is crucial for their biomedical applications. However, the detailed study about the effects of iron oxide nanoparticles on cell viability, cell morphology, and cellular uptake of different mammalian cells is still insufficient. In this paper, comparative cytotoxicity study of uncoated magnetite nanoparticles at different concentrations was performed on human cervical cancer cell line (HeLa) and immortalized normal human retinal pigment epithelial cell line (RPE). The size, structure, and magnetic behavior of the MIONPs were characterized using transmission electron microscopy (TEM), X-ray diffractometry (XRD), and vibrating sample magnetometry (VSM) respectively. After 24-hour incubation with the MIONPs, the cell viability was determined by live/dead assay, the cell morphology at high magnification was observed under scanning electron microscopy (SEM), and the cellular uptake of MIONPs was measured under TEM and verified by energy-dispersive X-ray spectroscopy (EDX) analysis. Our results indicate that the uncoated MIONPs at a high concentration (0.40 mg/ml) were toxic to both HeLa and RPE cells. However, the cytotoxicity of uncoated MIONPs at low concentrations was cell-type specific, and RPE cells were more susceptible to these MIONPs than HeLa cells. The effects of the MIONPs on cell morphology and the nanoparticles uptake also showed different features between these two cell lines. Hence cell type should be taken into consideration in the in vitro cytotoxicity study of uncoated MIONPs. Additionally, it should be noticed that the cell morphological changes and the uptake of nanoparticles can take place even though no toxic effect of these MIONPs at low concentrations was reflected in the traditional cell viability assay.

Cooling field and ion-beam bombardment effects on exchange bias behavior in NiFe/(Ni,Fe)O bilayers.

The dependence of the cooling field and the ion-beam bombardment on the exchange bias effects in NiFe/(Ni,Fe)O bilayers were investigated. The positive exchange bias was found in the zero-field-cooled (ZFC) process whereas a negative exchange bias occurred in the FC process. The increased exchange field, H(ex) with increasing (Ni,Fe)O thicknesses indicates the thicker the AF (Ni,Fe)O, the stronger the exchange coupling between the NiFe layer and the (Ni,Fe)O layer. In addition, the dependence of the H(ex) (ZFC vs. FC) on the (Ni,Fe)O thicknesses reflects the competition between the applied magnetic field and the (Ni,Fe)O surface layer exchange coupled to the NiFe layer. Further, an unusual oscillating exchange bias was observed in NiFe/(Ni,Fe)O bilayers that results from the surface of the (Ni,Fe)O layer being bombarded with different Ar-ion energies using End-Hall deposition voltages (V(EH)) from 0 to 150 V. The behavior of the H(ex) and the H(c) with the V(EH) is attributed to the surface spin reorientation that is due to moderate ion-beam bombardment effects on the surface of the (Ni,Fe)O layer. Whether the (Ni,Fe)O antiferromagnetic spins are coupled to the NiFe moments antiferromagnetically or ferromagnetically changes the sign of the exchange bias.

Adenocarcinoma of the duodenum.

Adenocarcinoma of the duodenum is an exceedingly rare disorder. Its vague and non-specific symptoms often lead clinicians and patients to suspect other more benign differential diagnoses. Improved endoscopy and radiology have enabled more of these cases to be unearthed. Definitive surgery is the only means of potential cure, with the prognosis being significantly better for node-negative patients. We present a case of a 52-year-old man who underwent a Whipple's operation for this uncommon disease and a literature review of the subject.

Tuning the exchange bias in NiFe/Fe-oxide bilayers by way of different Fe-oxide based mixtures made with an ion-beam deposition technique.

We have investigated the structural and magnetic properties of ion-beam deposited polycrystalline NiFe (25 nm)/Fe-oxide (35 nm) bilayers. A film prepared with an assist beam O2 to Ar gas ratio of 0% during deposition had a bottom layer that consisted of pure b.c.c. Fe (a = 2.87 A) whereas films prepared with 19%O2/Ar and 35%O2/Ar had either Fe3O4 (a = 8.47 angstroms) or alpha-Fe2O3 (a = 5.04 angstroms, c = 13.86 angstroms) bottom layers, respectively. Cross-sectional transmission electron microscopy revealed a smooth interface between the top nano-columnar NiFe and bottom nano-columnar Fe-oxide layer for all films. At room temperature, the observed coercivity (Hc approximately 25 Oe) for a film prepared with 19% O2/Ar indicates the existence of a magnetically hard ferrimagnetic Fe3O4 phase that is enhancing the plain NiFe (Hc approximately 2 Oe) by way of exchange coupling. A significant amount of exchange bias is observed below 50 K, and at 10 K the size of exchange bias hysteresis loops shift increases with increasing oxygen in the films. Furthermore, the strongest exchange coupling (H(ex) approximately 135 Oe at 10 K) is with alpha-Fe2O3 (35% O2/Ar) as the bottom film layer. This indicates that the pure antiferromagnetic phases work better than ferrimagnetic phases when in contact with ferromagnetic NiFe. H(ex) (T) is well described by an effective AF domain wall energy that creates an exchange field with a (1 - T/T(crit)) temperature dependence. Hc (T) exhibits three distinct regimes of constant temperature that may indicate the existence of different AF spin populations that couple to the FM layer at different temperatures.

Preclinical targeting of aggressive T-cell malignancies using anti-CD5 chimeric antigen receptor.

The outlook for T-cell malignancies remain poor due to the lack of effective therapeutic options. Chimeric antigen receptor (CAR) immunotherapy has recently shown promise in clinical trials for B-cell malignancies, however, designing CARs for T-cell based disease remain a challenge due to the shared surface antigen pool between normal and malignant T-cells. Normal T-cells express CD5 but NK (natural killer) cells do not, positioning NK cells as attractive cytotoxicity cells for CD5CAR design. Additionally, CD5 is highly expressed in T-cell acute lymphoblastic leukemia (T-ALL) and peripheral T-cell lymphomas (PTCLs). Here, we report a robust anti-CD5 CAR (CD5CAR) transduced into a human NK cell line NK-92 that can undergo stable expansion ex vivo. We found that CD5CAR NK-92 cells possessed consistent, specific, and potent anti-tumor activity against a variety of T-cell leukemia and lymphoma cell lines as well as primary tumor cells. Furthermore, we were able to demonstrate significant inhibition and control of disease progression in xenograft mouse models of T-ALL. The data suggest that CAR redirected targeting for T-cell malignancies using NK cells may be a viable method for new and complementary therapeutic approaches that could improve the current outcome for patients.

Smartphone-based heart-rate measurement using facial images and a spatiotemporal alpha-trimmed mean filter.

Currently, cardiovascular disease affects a relatively high proportion of the world's population. Thus, developing simple and effective methods for monitoring patients with cardiovascular disease is critical for research. Monitoring the heart rate of patients is a relatively simple and effective method for managing patients with this condition. For patients, the desired heart rate monitoring equipment should be portable, instantaneous, and accurate. Because smartphones have become the most prevalent mobile device, we utilized this technology as a platform for developing a novel heart-rate measurement system. Catering to the phenomenon of people using the front camera of their smartphones as a mirror, the proposed system was designed to analyze facial-image sequences captured using the front camera. A spatiotemporal alpha-trimmed mean filter was developed to estimate a user's heart rate quickly and accurately. The experimental results show that in addition to achieving these objectives, the developed system outperforms a similar personal computer-based system. In addition, the system performs effectively even when users are wearing glasses. Hence, the proposed system demonstrates practical value for people who must monitor their heart rate daily.

Telomere length as a predictor of response to Pioglitazone in patients with unremitted depression: a preliminary study.

We studied peripheral leukocyte telomere length (LTL) as a predictor of antidepressant response to PPAR-γ agonist in patients with unremitted depression. In addition we examined correlation between LTL and the insulin resistance (IR) status in these subjects. Forty-two medically stable men and women ages 23-71 with non-remitted depression participated in double-blind placebo-controlled add-on of Pioglitazone to treatment-as-usual. Oral glucose tolerance tests were administered at baseline and at 12 weeks. Diagnostic evaluation of psychiatric disorders was performed at baseline and mood severity was followed weekly throughout the duration of the trial. At baseline, no differences in LTL were detected by depression severity, duration or chronicity. LTL was also not significantly different between insulin-resistant and insulin-sensitive subjects at baseline. Subjects with longer telomeres exhibited greater declines in depression severity in the active arm, but not in a placebo arm, P=0.005, r=-0.63, 95% confidence interval (95% CI)=(-0.84,-0.21). In addition, LTL predicted improvement in insulin sensitivity in the group overall and did not differ between intervention arms, P=0.036, r=-0.44, 95% CI=(-0.74,0.02) for the active arm, and P=0.026, r=-0.50, 95% CI=(-0.78,-0.03) for the placebo arm. LTL may emerge as a viable predictor of antidepressant response. An association between insulin sensitization and LTL regardless of the baseline IR status points to potential role of LTL as a non-specific moderator of metabolic improvement in these patients.

Interface mixing and its impact on exchange coupling in exchange biased systems.

Exchange bias and interlayer exchange coupling are interface driven phenomena. Since an ideal interface is very challenging to achieve, a clear understanding of the chemical and magnetic natures of interfaces is pivotal to identify their influence on the magnetism. We have chosen Ni80Fe20/CoO(t CoO)/Co trilayers as a model system, and identified non-stoichiometric Ni-ferrite and Co-ferrite at the surface and interface, respectively. These ferrites, being ferrimagnets typically, should influence the exchange coupling. However, in our trilayers the interface ferrites were found not to be ferro- or ferri-magnetic; thus having no observable influence on the exchange coupling. Our analysis also revealed that (i) interlayer exchange coupling was present between Ni80Fe20 and Co even though the interlayer thickness was significantly larger than expected for this phenomenon to happen, and (ii) the majority of the CoO layer (except some portion near the interface) did not contribute to the observed exchange bias. We also identified that the interlayer exchange coupling and the exchange bias properties were not interdependent.

Ethnobotanical study of medicinal plants used by the Jah Hut peoples in Malaysia.

CONTEXT: An ethnobotanical study was carried out among the Jah Hut people who live in the central part of peninsular Malaysia. MATERIALS AND METHODS: The information on the medicinal plants was obtained from interview with a traditional medicinal man. The traditional uses and remedies were documented. The literature searches were carried out for the evaluation on the current status of investigations on these plants. RESULTS: In this study, we present 16 species of plants, which are commonly used among the Jah Hut people to cure some common diseases. DISCUSSION: This study is important to preserve the knowledge of medicinal plants used by Jah Hut people. The surveys of phytopharmacological literatures of these plants have great pharmacological and ethnobotanical significance.

Identification of core sequences involved in metabolism-dependent nuclear protein binding to the rat insulin-like growth factor I gene.

In the liver, most insulin-like growth factor I (IGF-I) transcripts originate in exon 1, where important cis-regulatory regions are located downstream from the major transcription initiation sites. Within these regions, we have attempted to identify sequences which are involved in the decrease in IGF-I gene transcription associated with diabetes mellitus. The function of different genomic templates was assessed by in vitro transcription, which revealed a consistent 50-80% decrease in the activity of nuclear extracts from streptozotocin-diabetic as compared with normal rats. The disparity in transcriptional activity between normal and diabetic nuclear extracts was reduced with templates containing 11-bp mutations within DNase I protected regions III or V (+42 and +129 bp, respectively, from the major transcription initiation site), but a mutation between regions IV and V had little effect. Within region III, gel mobility shift analysis and methylation interference studies indicated that DNA-protein interactions involve a GCGC core sequence. In region V, gel mobility shift studies and uracil interference analysis revealed interactions involving a TTAT core. While gel mobility shift analysis and transient transfection studies indicate that the GCGC core sequence in region III recognizes C/EBP, the AT-rich sequence in region V is likely to recognize a protein with homeodomain characteristics. Identification of the nuclear factor(s) interacting with regions III and V, downstream from exon 1 initiation sites, will be important for understanding the mechanism of reduced IGF-I gene transcription due to diabetes mellitus.

Formation of dimethylarsinic acid from methylation of sodium arsenite in lumbricus terrestris.

Arsenic is ubiquitous in the environment and the toxicological response of various organisms to it is dependent on the particular chemical form involved. In general, methylation of inorganic arsenic is considered to be a detoxification reaction. While this transformation is known to be mediated by methyltransferases in several species of mammals, less is known about the fate of arsenic in invertebrates. As part of a continuing interest in heavy metals and metalloid toxicology, the alkylating activity of cytosol prepared from the common earthworm, Lumbricus terrestris, towards sodium arsenite has now been investigated. Thus, S-adenosyl-l-[(14)C]methionine ([(14)C-methyl]SAM) fortified earthworm cytosol was incubated with sodium arsenite at 37 degrees C for 90 min. Initial TLC analysis of the incubation mixture suggested incorporation of radiolabel into dimethylarsinic acid. This was subsequently proven by isolation of the metabolite through radiodilution followed by recrystallization of the recovered material to constant specific activity. This result suggests that earthworm cytosol has the same methylating reactivity towards arsenite as do similar preparations from various tissues of several species of mammals.

Quality characteristics of reduced-fat Chinese-style sausage as related to chitosan's molecular weight.

Microbiological and physicochemical characteristics of reduced-fat (approximately 22%) Chinese-style sausages containing 0.1% chitosan (in 1% lactic acid solution) with three different molecular weights [low molecular weight chitosan (CHL), MW= 150 kDa; medium molecular weight chitosan (CHM), MW=600 kDa; high molecular weight chitosan (CHH), MW=1250 kDa] were demonstrated. Sausages were also subject to oven heating or deep-fat frying for sensory evaluation. Treatments containing chitosan were lower in pH at any storage periods than the control (CONT). Generally speaking, total plate counts and lactic acid bacteria counts of all treatments slightly increased, with CHL being the lowest. However, all bacterial counts were lower than 7 [log colony forming unit (CFU)/g] at the end of storage. Results from sensory evaluation showed that deep-fat fried sausages from treatments CHL and CHM were higher in overall acceptability. This study demonstrated that the addition of chitosan to reduced-fat Chinese-style sausage resulted in no detrimental effect on textural properties.

[Inhibition of gastric myoelectric activity and gastric motility by microinjection of substance P into dorsal vagal nucleus in rats].

The present investigation showed that microinjection of substance P (SP) into dorsal vagal nucleus inhibited gastric myoelectric fast wave and gastric motility. The effect could be blocked by SP antiserum or SP antagonist [Arg6, D-Trp7,9, N-Me-Phe8]-SP6-11 or vagotomy. Depletion of sympathetic transmitters by reserpine did not affect induction of the inhibition. The results indicate that both exogenous and endogenous SP of dorsal vagal nucleus decrease the gastric myoelectric fast wave and motility, which is mediated by vagus nerve.

[Effect and its mechanism of substance P on contractile activity of isolated antral muscle strips of rat].

The present study was aimed at investigating the effect of substance P (SP) on the contractile activity of isolated antral muscle strips of rat and its underlying mechanism. Isolated strips were incubated in an organ bath into which SP was added with or without pretreatment of some antagonists or inhibitors. The results were as follows: (1) SP increased the contractile amplitude of the strips in a dose-dependent manner from 8 x 10(-11) to 8 x 10(-7) mol. At 4 x 10(-8) mol the amplitude was increased by 160.9 +/- 23.0%, while the automaticity of the strips was not affected. (2) This effect of SP could be partially inhibited by hexamethonium (ganglionic blocker), cyproheptadine (blocker of 5-HT2 receptor), diphenhydramine (blocker of H1 receptor), or aminophylline (inhibitor of phosphodiesterase), but not by atropine, propranolol, phentolamine, haloperidol, or naloxone. These results suggested that SP might be a non-cholinergic excitatory transmitter. Its spasmogenic action might be mediated by activating 5-HT neurons, which elicited release of histamine or directly acted on muscle cells.

[Inhibition of gastric myoelectric activity and gastric motility induced by microinjection of substance P into caudate nucleus in mouse].

Changes of gastric myoelectric fast wave, slow wave and gastric motility were studied after microinjection of substance P or ACh into caudate nucleus in an attempt to find the interaction between the two substances. Gastric myoelectric activity and motility were recorded by a RM-6200 four channel recorder and then delivered to a IBM-PC computer for analysis. After microinjection of SP or ACh into caudate nucleus, the gastric myoelectric fast wave and gastric motility were significantly suppressed, while the slow wave was not significantly changed.

[Inhibitory effect of substance P of caudate nucleus on gastric motility via substantia nigra and dorsal vagal nucleus mediated by vagus nerve].

Effects of lesion of bilateral hypothalamus (LH), substantia nigra and dorsal vagal nucleus as well as their efferent pathway on the inhibition of gastric myoelectric fast wave and gastric motility due to injection of substance P (SP) to caudate nucleus were studied in rats. The experimental results showed that this induced inhibition was independent of the presence of intact LH but abolished by lesioning substantia nigra, dorsal vagal nucleus or vagus nerve. Depletion of sympathetic transmitter by reserpine did not affect the occurrence of the inhibition. Thus, it appears that the gastric inhibitory effect of caudate nucleus SP is mediated via substantia nigra and dorsal vagal nucleus to vagus nerve.

[Effect of bile salt in duodenum on gastric myoelectric activity and motility of mouse with a preliminary study of its neuromechanism].

Changes of gastric myoelectric fast wave, slow wave and gastric motility were studied after intraduodenal infusion of sodium taurocholate (ST) in an attempt to search the concerned neuromechanism. Frequency and total amplitude of the fast wave and slow wave of gastric myoelectric activity and of gastric contractile wave were recorded every five minutes before and after intraduodenal infusion of ST under the background action of various drugs. The frequency and amplitude were expressed in percentage change of the respective premedication value. After intraduodenal infusion of ST (n = 10) the frequency and the amplitude of fast wave and gastric contractile wave were suppressed. Blocking anesthesia of celiac plexus, reserpinization and intravenous infusion of carbachol could eliminate the inhibition induced by ST, which could be partly eliminated by intravenous infusion of propranolol but not affected by phentolamine at all. The results demonstrate that intraduodenal infusion of bile salt suppresses the fast wave of gastric myoelectric activity and gastric motility, most probably controlled by efferent sympathetic adrenergic fibres through beta-receptor.

[Participation of dopamine on the muscarinergic inhibitory effect of substance P on gastric myoelectric activity and motility].

Our previous study showed that microinjection of substance P (SP) into caudate nucleus inhibits gastric myoelectric fast wave and gastric motility, an effect mediated by muscarinic receptor. The present investigation showed that this effects of SP could be blocked by coinjected SP antiserum or SP antagonist [Arg6, D-Trip7,9, MePhe8]-SP6-11 or D2 dopamine antagonist haloperidol. In addition, microinjection of dopamine (DA) into caudate nucleus could also inhibit gastric fast wave and motility, an effect again being blockable by coinjected DA antagonist haloperidol or atropine. Thus, it appears that the muscarinergic inhibitory effect of SP on gastric fast wave and motility is mediated by D2 dopamine receptor.