Educational interventions about dementia have been effective in t

Educational interventions about dementia have been effective in the long-term care community; however, there is a need for increased on-the-job training regarding depression in older adults in order to improve the ability to differentiate depression

from dementia, especially for paraprofessional staff.”
“The expression of heat shock proteins (Hsps) commonly increases to provide neuroprotection when brain tissues are under stress conditions. Residues of avermectins (AVMs) have neurotoxic effects on a number of non-target organisms. The aim of this study was to investigate the effects of AVM exposure on the expression levels of Hsp 60, Hsp 70 and Hsp 90 for pigeon (Columba livia) neurons both in vivo and in check details vitro. The results showed that in general, the mRNA and protein levels of Hsps were increased in treated groups relative to control groups after AVM exposure for 30 d, 60 d and 90 d in the cerebrum, cerebellum and optic lobe in vivo. However, AVM exposure had no significant effects on the transcription expression of Hsps for 90 d in the optic lobe and decreased the translation expression of Hsps significantly for 90 d in the optic lobe. In vitro, the LC50 of avermectin for Sapitinib inhibitor King pigeon neurons is between 15

mu g L-1 and 20 mu g L-1. Following AVM (2.5-20 mu g L-1) exposure, the mRNA expression of the 3 Hsps was up-regulated to different degrees. Compared with the control groups, a significant decrease, a remarkable increase and a non-significant change was found in the protein expression of Hsp 60, Hsp 70 and Hsp 90 separately following AVM (2.5-20 mu g L-1) exposure. Based on these results, we conclude that AVM exposure can induce a protective stress response in pigeons by means of promoting the mRNA and protein expression

of Hsps under in vivo and in vitro conditions, thus easing the neurotoxic effects of AVM to some extent. (C) 2014 Elsevier Inc. All rights reserved.”
“BACKGROUND: Transcobalamin (TC) and haptocorrin (HQ are serum corrinoid-binding proteins. Selleck AZD8931 We developed new methods for measurement of the corrinoids bound to HC and TC.\n\nMETHODS: TC (n = 10) or HC (n = 138) was immunoprecipated, and corrinoids were released by enzymatic degradation [subtilisin Carlsberg (EC 3.4.21.62)] of the binding proteins. Binding of the released corrinoids to added unsaturated TC (apoTC) or HC (apoHC) created holoTC (as measure of cobalamins) and holoHC (as measure of corrinoids). holoTC and holoHC were measured by use of ELISA. The amounts of analogs were Calculated as the difference between corrinoids and cobalamins. Corrinoids extracted from HC were separated with HPLC after addition of potassium cyanide (n = 3).

It has been seen that increasing value from by-products of oil pr

It has been seen that increasing value from by-products of oil production is important for the viability of the crop for the farmers. The seed kernel meal left after oil extraction is A-1210477 nmr potentially of high market value as an animal feed ingredient. Every kilogram of oil produced from jatropha seeds generates about 0.75 kg of high quality seed kernel meal. It has a high protein content (65% on a dry matter basis) with a favourable amino acid composition, but is toxic because of the presence of compounds called phorbol esters. We introduce a non-toxic jatropha variety where phorbol esters are absent in the seeds and hence, the kernel meal can be included in animal feeds after conventional heat treatment

similar to that done for soybean meal. Preliminary observations in a field trial indicates that there are non-toxic jatropha provenances that are similar to or better than the conventional toxic jatropha varieties in seed yield

per plant and seed oil content. Non-toxic jatropha check details has potential as a viable bio-oil crop if high quality seeds are used for developing the plantation. (C) 2012 Elsevier B.V. All rights reserved.”
“Glutaredoxins (Grxs) are ubiquitous small heat-stable disulfide oxidoreductases that play a crucial role in plant development and response to oxidative stress. Here, a novel cDNA fragment (SlGRX1) from tomato encoding a protein containing the consensus Grx family domain with a CGFS active site was isolated and characterized. Southern blot analysis indicated that SlGRX1 gene had a single copy in tomato genome. Quantitative real-time RT-PCR analysis revealed

that SlGRX1 was expressed learn more ubiquitously in tomato including leaf, root, stem and flower, and its expression could be induced by oxidative, drought, and salt stresses. Virus-induced gene silencing mediated silencing of SlGRX1 in tomato led to increased sensitivity to oxidative and salt stresses with decreased relative chlorophyll content, and reduced tolerance to drought stress with decreased relative water content. In contrast, over-expression of SlGRX1 in Arabidopsis plants significantly increased resistance of plants to oxidative, drought, and salt stresses. Furthermore, expression levels of oxidative, drought and salt stress related genes Apx2, Apx6, and RD22 were up-regulated in SlGRX1-overexpressed Arabidopsis plants when analyzed by quantitative real-time PCR. Our results suggest that the Grx gene SlGRX1 plays an important role in regulating abiotic tolerance against oxidative, drought, and salt stresses.”
“Huntington’s disease (HD) is an autosomal dominant, progressive, neurodegenerative disorder caused by an unstable expansion of CAG repeats ( bigger than 35 repeats) within exon 1 of the interesting transcript 15 (IT15) gene. This gene encodes a protein called Huntingtin (Htt), and mutation of the gene results in a polyglutamine (polyQ) near the N-terminus of Htt.

A study by Lee et al found the costs of home HD to be substantia

A study by Lee et al. found the costs of home HD to be substantially less than IHD ($93,976 vs. $54,936, p < 0.001). A study by Kroeker et al. found that the lowest costs were seen with home short daily HD ($82,522),

compared with $89,154 for IHD, and $91,218 for HNHD. Two studies by McFarlane et al. found that total costs were lower for those receiving HNHD (IHD $87,172 vs. HNHD $71,313), and that HNHD was associated with a superior cost-utility ratio (CAN$ 2011, HNHD $84,430/quality-adjusted life year [QALY] vs. IHD $148,722/QALY, incremental cost-effectiveness ratio: -$54,281, p < 0.05). While consistent findings of lower staffing and overhead costs for home HD, and higher consumable costs for frequent dialysis are probably reliable, findings ACY-241 of lower medication and hospital admission costs seen with intensive HD will need confirmation in randomized studies. Selleckchem PFTα Modifications to conventional dialysis funding are needed to accommodate for the additional costs of supplies and technology needed to support intensive modalities.”
“P>Background and Aim of the Study: Dilatation of the STJ may cause consequent aortic insufficiency (AI) in patients with normal aortic valve, in patients with ascending aortic aneurysm. In this study, we analyzed the results of ascending aorta replacement with STJ diameter reduction to correct consequent AI in patients with ascending aortic aneurysm. Methods:

Forty-five consecutive patients who had ascending aortic aneurysm underwent replacement of ascending aorta with reduction of the STJ diameter to correct AI. Mean age of the patients was 61.3 +/- 5.2. Twenty-six

(57.8%) were female. Six patients had arch aneurysm. Postoperative echocardiographic studies were performed at discharge and annually thereafter. The mean duration of follow-up was 4.6 +/- 2.9 years. Results: Hospital mortality rate was 4.9% (n = 2). Three patients died during follow-up. Three patients had late recurrence of AI that was caused by aortic root dilatation. Napabucasin One of these patients required aortic valve replacement because of severe aortic insufficiency. The five-year survival and survival free from aortic insufficiency were 91.4% +/- 5.0% and 91.2% +/- 5.1%, respectively. Conclusions: Reduction of the diameter of STJ can be used to treat AI in patients with ascending aortic aneurysm with nearly normal aortic cusps. Midterm results of this procedure are encouraging. (J Card Surg 2011;26:88-91).”
“We describe the case of a nine-day-old female Holstein calf which had cheiloschisis, a moderate dome-shaped head, ataxia and opisthotonus since birth. No significant findings except the dome-shaped head were observed on survey radiography of the skull. Computed tomography (CT) images showed bilateral lateral ventriculomegaly, cerebellar hypoplasia and a cyst-like lesion communicating with the right lateral ventricle.


“In this study, biodegradation of natural organic matter (


“In this study, biodegradation of natural organic matter (NOM) in a biological aerated filter (BAF) as pretreatment of UF treating river water was investigated. Photometric measurement, three-dimensional excitation-emission matrix (EEM) fluorescence spectroscopy and liquid chromatography with online organic carbon detector (LC-OCD) were used to investigate the fate of NOM fractions in the BAF + UF process. Results showed that the BAF process could effectively

remove particles and parts of dissolved organic matter, check details which led to a lower NOM loading in the UF system, but different NOM fractions showed different biodegradation potentials. Further biodegradation batch experiments confirmed this observation and identified that polysaccharides and

proteins (quantified using photometric BMS-777607 order methods) contained a large proportion of readily biodegradable matter while humic substances were mainly composed of inert organic substances. According to EEM measurements, it is evident that protein-like substances were more readily eliminated by microorganisms than humic-like substances. LC-OCD data also supported the phenomena that the polysaccharides and large-size proteins were more degradable than humic substances.”
“Objectives To evaluate the occurrence of symptomatic and asymptomatic root compression caused by herniated discs and spondylotic foraminal stenosis by MRI in patients with recent onset cervical radiculopathy.\n\nParticipants 78 patients with symptoms

and signs of cervical radiculopathy of less than one month’s duration.\n\nMethods The authors determined the clinically suspected level of root compression in each patient. Two neuroradiologists independently evaluated MRIs, blinded for the clinical findings. For each patient, the level of root compression on MRI was compared with the clinically affected level. The authors also examined the cause of compression: herniated disc, spondylotic foraminal stenosis or both.\n\nResults In 73% of patients, the clinically affected root was compressed on MRI. In 45%, MRI showed root compression without clinical substrate together with, or to a lesser extent without, the coexistence of compression of the clinically affected root. MRIs were assessed Selleck Apoptosis Compound Library as normal in 13-15% of cases, and in 9-10% only asymptomatic roots were compressed. Herniated discs without spondylosis were more often responsible for root compressions only at the clinically affected level and spondylotic foraminal stenosis for multiple root compression including compression of clinically unaffected roots.\n\nConclusion MRI findings in patients with cervical radiculopathy should be interpreted together with the clinical findings, as false-positive and false-negative MRIs occur rather frequently.”
“Selective internal radiation treatment (SIRT) via intrahepatic arterial administration of Y-90 microspheres is an effective therapeutic modality.

These results suggest that: (1) HBO treatment could alleviate bra

These results suggest that: (1) HBO treatment could alleviate brain damage after TBI; (2) a single treatment with HBO has a time limitation of 12 h post-TBI; and (3) multiple HBO treatments have the possibility to extend the post-TBI delivery time window. Therefore, our results clearly suggest the validity of HBO therapy for the treatment of TBI.”
“An independent origin of selleck chemical the left vertebral artery from the aortic arch is the second most common aortic arch anomaly and occurs in 7% of otherwise

healthy persons. Bilateral and independent origins of vertebral arteries are distinctly unusual. We present and illustrate such a case.”
“Regaining poststroke mobility is considered a primary goal of the stroke patient in early rehabilitation. Predictive recovery of poststroke mobility is clinically important, and provides important information to healthcare professionals, patients and their families. We conducted a systematic review aimed at identifying the predictive or associated baseline factors, assessed within one-week of stroke onset, and the recovery of poststroke mobility within 30 days. A comprehensive search strategy was applied to all AZD5363 order major electronic databases to identify potentially relevant studies. Included in the review are two studies that evaluate the predictive value of baseline factors by developing a prognostic model, and

three studies that assess the baseline factors that were associated with

the outcome by univariate analysis. Walking is the most commonly assessed mobility outcome; age, the severity of paresis, reduced leg power, presence of hemianopia, size of brain lesion and type of stroke were shown to be predictive or associated with walking within 30 days poststroke. This review has identified the potential predictors of the recovery of mobility poststroke. There is a need to explore and validate these predictors in other patient cohorts, and consider additional factors believed to be associated with mobility. The recovery of mobility other than walking also Rabusertib needs investigation. In order to move prognostic research in stroke forward, a collaborative approach to sharing and collecting data is recommended.”
“In this article, we study the problems of Borel’s directions of meromorphic functions concerning shared values and prove that if two meromorphic functions of infinite order share three distinct values, their Borel’s directions are same.”
“Liquid ball-milling dispersant method was used to prepare the ZrO2-doped carbon laminations from mesocarbon microbeads(MCMBs). After sintering at 1 300 degrees C in nitrogen atmosphere, the effect of ZrO2 concentration on sintering behavior, electric conductivity as well as bending strength of the carbon laminations was investigated in detail.

Copyright

Copyright IPI-145 purchase (C) 2010 John Wiley & Sons, Ltd.”
“We studied the reflex actions of the cutaneous afferents innervating the trunk

to hindlimb motoneurons in the spinal cat using an intracellular recording technique. Stimulation of the trunk Cutaneous afferents entering into the L2-L5 spinal segment produced different types of polysynaptic potentials in hindlimb motoneurons via polysynaptic neuronal pathways. The trunk Cutaneous afferents predominantly caused excitatory PSPs in the flexor motoneurons and inhibitory PSPs in the extensor motoneurons. The size and latency of polysynaptic potentials were related to the proximity of the spinal segments of the nerves stimulated to the spinal segments of motoneurons. These Findings suggest that the neuronal pathways from trunk cutaneous afferents to hindlimb motoneurons play all important role in coordinating between the trunk and hindlimbs.”
“To investigate seasonal changes in transcript levels of flowering-related genes corresponding to shoot condition, the endogenous expression patterns of FLOWERING LOCUS T (FT), SUPPRESSOR OF OVEREXPRESSION OF CONSTANS 1 (SOC1), LEAFY (LFY), TERMINAL FLOWER 1 (TFL1), and CENTRORADIALIS (CEN) homologs were investigated in evergreen azalea

‘Oomurasaki’. In this plant, in which the floral transition is triggered by the about 25 degrees C and shortening days of summer under natural conditions, the mRNA levels of ACY-738 the FT. SOC1, and LFY homologs (RpFT, RpSOC1, and RpLFY) increased in August corresponding to the period of flower bud formation, and the mRNA levels of TFL1 and CEN homologs (RpTFL1 and RpCEN) increased https://www.selleckchem.com/products/gm6001.html during July before flower bud formation. RpTFL1 showed low transcript levels during the period of flower bud formation and development, but RpCEN showed a different

expression pattern from RpTEL1. The expression of RpCEN, RpSOC1, and RpLFY peaked again during January corresponding to the period of flower bud dormancy. During blooming in May, the expression levels of all the investigated genes were low. In the period of flower bud formation. RpFT expression started to increase, and the expression of RpSOC1 peaked in mid-July. These results suggest that the shoot apical meristem (SAM) starts to transition from vegetative to reproductive growth in mid-July. Thus, changes in the transcription of RpFT, RpSOC1, and RpLFY were found to correlate positively with seasonal flowering in the shoot apex of ‘Oomurasaki’. whereas changes in RpTFL1 and RpCEN transcription correlated negatively with seasonal flowering. (C) 2011 Elsevier B.V. All rights reserved.”
“Objective: The purpose of this case series is to report on the effects of passive joint mobilization (PJM) of the shoulder, elbow, and wrist on pain intensity, pain sensitivity, and function in elderly participants with secondary carpometacarpal osteoarthritis (CMC OA).

Predicted targets of these miRNAs were involved in focal adhesion

Predicted targets of these miRNAs were involved in focal adhesion/integrin pathway and in actin cytoskeleton regulation. The identified miRNAs might contribute to molecular regulation of reverse remodeling and heart recovery mechanisms.”
“Background:

Long-acting reversible contraception (LARC) is underused in many countries in sub-Saharan Africa. Many previous attempts to increase uptake of this important class of contraception have not been successful.\n\nStudy Design: This program in Zambia employed 18 dedicated providers of LARC, placed them in high volume public sector facilities and collected routine, anonymous information over a 14-month period. We tallied uptake of LARC, analyzed user characteristics to see what populations were reached by the program and compared this to nationally representative data. We also estimated HIF activation costs per couple-year of protection of the program.\n\nResults: In a 14-month period, 33,609 clients chose MLN8237 either a subdermal implant (66%) or an intrauterine device (34%). The program reached a younger and lower parity population compared to nationally representative surveys of Zambian women using contraception. The estimated program costs, including the value of donated commodities, averaged $13.0 per couple-year of protection.\n\nConclusion: By having the necessary time, skills and materials – as well as a mandate

to both generate informed demand and provide quality services – dedicated providers of LARC can expand contraceptive choice. This new approach shows what can be achieved in a short period and in a region of the world where uptake of LARC is limited. (C) 2011 Elsevier Inc. All rights reserved.”
“Mouse models can provide useful information to understand molecular mechanisms of human tumorigenesis. In this study, the conditional thyroid mutagenesis of Pten and Ras genes in the mouse, which induces very aggressive follicular carcinomas (FTCs), has been used to identify genes differentially expressed among human normal thyroid tissue Epigenetics inhibitor (NT), follicular adenoma (FA), and FTC. Global gene expression of mouse FTC was compared

with that of mouse normal thyroids: 911 genes were found deregulated +/- 2-fold in FTC samples. Then the expression of 45 deregulated genes in mouse tumors was investigated by quantitative RT-PCR in a first cohort of human NT, FA, and FTC (discovery group). Five genes were found significantly down-regulated in FA and FTC compared with NT. However, 17 genes were found differentially expressed between FA and FTC: 5 and 12 genes were overexpressed and underexpressed in FTC vs FA, respectively. Finally, 7 gene products, selected from results obtained in the discovery group, were investigated in a second cohort of human tumors (validation group) by immunohistochemistry. Four proteins showed significant differences between FA and FTC (peroxisomal proliferator-activated receptor-gamma, serum deprivation response protein, osteoglycin, and dipeptidase 1).

After initial stabilization including furosemide, angiotensin-con

After initial stabilization including furosemide, angiotensin-converting enzyme inhibitors, pimobendan and digoxin,

spironolactone at a median dose of 0.52 mg/kg (range 0.49-0.8 mg/kg) once daily (n = 9) or placebo (n = 9) was added to the treatment, and the dogs were reassessed 3 and 6 months later. Clinical scoring, echocardiography, electrocardiogram, systolic blood pressure measurement, thoracic radiography, sodium, potassium, urea, creatinine, alanine aminotransferase, aldosterone and aminoterminal atrial natriuretic VX-809 manufacturer propeptide were assessed at baseline, 3 and 6 months. Survival times were not significantly different between the two treatment groups. Spironolactone was well tolerated when combined with conventional heart failure treatment.”
“Objective: To compare the effective doses (EDs) associated with imaging modalities for follow-up of patients with urolithiasis, including stone protocol non-contrast computed tomography (NCCT), kidney, ureter, and bladder radiograph (KUB), intravenous urogram (IVU),

and digital tomosynthesis (DT). Methods: A validated Monte-Carlo simulation-based software PCXMC 2.0 (STUK) designed for estimation of patient dose from medical X-ray exposures was used to determine the ED for P5091 mouse KUB, IVU (KUB scout plus three tomographic images), and DT (two scouts and one tomographic sweep). Simulations were performed using a two-dimensional stationary field onto the corresponding body area of the built-in digital phantom, with actual kVp, mAs, and geometrical parameters of the protocols. The ED for NCCT was determined using an anthropomorphic

male phantom that was placed prone on a 64-slice GE Healthcare volume computed tomography (VCT) scanner. High-sensitivity metal oxide semiconductor field effect transistors dosimeters Sapanisertib were placed at 20 organ locations and used to measure organ radiation doses. Results: The ED for a stone protocol NCCT was 3.040.34mSv. The ED for a KUB was 0.63 and 1.1mSv for the additional tomographic film. The total ED for IVU was 3.93mSv. The ED for DT performed with two scouts and one sweep (14.2 degrees) was 0.83mSv. Conclusions: Among the different imaging modalities for follow-up of patients with urolithiasis, DT was associated with the least radiation exposure (0.83mSv). This ED corresponds to a fifth of NCCT or IVU studies. Further studies are needed to demonstrate the sensitivity and specificity of DT for the follow-up of nephrolithiasis patients.”
“Background. Magnetic resonance urography (MRU) is one of the most attractive imaging modalities in paediatric urology, providing largest diagnostic information in a single protocol. Therefore, the aim of our study was to assess the diagnostic value of MRU in children with urogenital anomalies (especially anomalies of the renal pelvis and ureter) and the renal function using different post-processing functional software.\n\nPatients and methods.

The structures of the resulting zeolites were characterized by in

The structures of the resulting zeolites were characterized by interpreting the X-ray powder-diffraction patterns through models using computational methods; IPC-2 exhibits orthogonal 12- and ten-ring channels, and IPC-4 is a more complex zeolite that comprises orthogonal ten- and eight-ring channels. We describe how this method enables the preparation of functional materials and discuss

its potential for targeting other new zeolites.”
“AIM: The purpose of this study was to compare the explosive force and electromyographic (EMG) activity at three different times of the day. METHODS: Thirty healthy subjects took part in the study, and carried out two maximum isometric voluntary knee extensions to measure explosive force, through contractile impulse (Cl) and rate of force development (RFD), and myoelectric signals from quadriceps muscles in the following periods: 07:30-09:30, www.selleckchem.com/products/ulixertinib-bvd-523-vrt752271.html 13:30-15:30 and 19:30-21:30 (called morning, afternoon and night respectively), on three non-consecutive days. RESULTS: The body temperature was lower in the

morning than in the afternoon and night periods. The explosive force, evaluated through contractile impulse (Cl) and rate Bcl-2 inhibitor of force development (RFD), was greater at night than in the morning, without differences in the myoelectric signal. CONCLUSION: The ability to produce explosive force varies throughout different selleck kinase inhibitor times of the day without variation in muscular recruitment, indicating that peripheral and not neural mechanisms could be responsible for this variation.”
“Of the 70 million persons with epilepsy (PWE) worldwide, nearly 12 million PWE are expected to reside in India; which contributes to nearly

one-sixth of the global burden. This paper (first of the two part series) provides an in-depth understanding of the epidemiological aspects of epilepsy in India for developing effective public health prevention and control programs. The overall prevalence (3.0-11.9 per 1,000 population) and incidence (0.2-0.6 per 1,000 population per year) data from recent studies in India on general population are comparable to the rates of high-income countries (HICs) despite marked variations in population characteristics and study methodologies. There is a differential distribution of epilepsy among various sociodemographic and economic groups with higher rates reported for the male gender, rural population, and low socioeconomic status. A changing pattern in the age-specific occurrence of epilepsy with preponderance towards the older age group is noticed due to sociodemographic and epidemiological transition. Neuroinfections, neurocysticercosis (NCC), and neurotrauma along with birth injuries have emerged as major risk factors for secondary epilepsy. Despite its varied etiology (unknown and known), majority of the epilepsy are manageable in nature.

Subjects and Methods: A descriptive cross-sectional survey

Subjects and Methods: A descriptive cross-sectional survey

of 83 dental auxiliaries was conducted that included 12 technologists, 11 therapists, 53 nurses/surgical assistants, and 7 record officers. The survey included demography, history of needlestick and sharps injury, hepatitis B vaccination, knowledge and attitude towards HIV-infected patients, and the dental auxiliaries’ information needs on HIV-related issues. Results: Of the 83 dental auxiliaries, 34 (41%) had experienced SN-38 clinical trial needlestick and sharps injury in the last 12 months. At the time of the study, only 43 (51.8%) had been immunized against hepatitis B. 62 (74.7%) of the respondents thought that it was easier to contract HIV than hepatitis B through needlestick in a dental

clinic. 21 (25.3%) would not assist dentists treating HIV-positive patients. However, 76 (91.6%), a majority, agreed that they needed more information on HIV-related issues, with 59 (71.1%) specifying a single area of need and 17 (20.5%) more than one area of need. The single areas of need specified in descending order were infection control (n = 22, 26.5%), HIV counseling (n = 12, 14.5%), oral manifestations of HIV/AIDS (n = 11, 13.3%), postexposure prophylaxis (n = 9, 10.8%), Alvocidib price and antiretroviral therapy (n = 5, 6.0%). Conclusion: The data from this survey underscore the urgent need for educational interventions to encourage safe work practices. Hepatitis B vaccination, find more HIV-related knowledge and proper postexposure prophylaxis are needed to prevent occupational transmission of blood-borne viruses. Copyright (C) 2010 S. Karger AG, Basel”
“In situ studies of the growth of the acentric crystal alpha-resorcinol from the vapor phase confirm that the mechanism of growth differs on the faces presented at the opposite ends of the polar axis of this material. At medium supersaturations (sigma = 0.76), the growth

of the (0 (11) over bar) and (01 (1) over bar) faces proceeds by the cooperative development of strongly propagating growth sources. Under similar conditions, the (011) and (0 (1) over bar1) faces develop a mosaic of flat-topped growth centers. These develop individually and merge to form a continuous, curved, facet bearing a few residual, weakly propagating birth and spread growth sources. The degree to which this mosaic growth occurs depends on the damage done to the face of the seed crystal during preparation. This behavior accounts for the previously observed wide variation in the estimates of growth rate of the positive faces and the differential in growth rates compared with that of the negative faces. On more perfect (011) surfaces, growth is restricted to a small degree of nucleation at isolated random centers. These nuclei undergo a more limited localized growth to yield a nonpropagating macroscopic surface roughness.