Application of calcium sulfate as graft material in implantology and maxillofacial procedures: A review of literature.

Calcium sulphate (plaster of Paris) has been used since 1892 to fill bone defects and as a good bone graft substitute. Calcium sulphate is an osteoconductive, inorganic substance. Following 75 years, many other authors reported variable and a better result in grafting of bone defects and in several cases of immediate and delayed dental implants for good osseointegrations, with no complications attributed to the calcium sulphate. Early results were variable, because of its conflicting crystalline structure, purity, and quality of the calcium sulphate. Apart from this, calcium sulphate also shows predictable resorption rate in vivo, presence of minimal trace elements and extremely uniform crystalline structure. Calcium sulphate is a bio-inert material and get resorbed over a period of weeks and fibrovascular tissue takes its place which eventually allows neovascularization and bone formation within the area. Use During the conventional surgical treatment addition of calcium sulphate as a bone graft of in case of placement of dental implants and pathological bony defects it improves the clinical outcome. Calcium sulphate also act as a barrier and filling material for the treatment of "through and through" bony lesions. Use of calcium sulphate as a bone graft substitute avoids the complications and morbidity associated with autograft like infection, second surgery.

High Prevalence and Lack of Parental Awareness of Pediatric Hypertension Among a Low-income Sample in Worcester, MA.

OBJECTIVES: To identify frequency and correlates of hypertension in a low income, ethnically diverse, sample of children as well as to assess parental awareness of hypertension. METHODS: This cross-sectional study included parent-child dyads (n = 228), from which physical measurements of the child, and parent reported survey measures were collected. Child's blood pressure percentile was determined via 2017 American Academy of Pediatrics (AAP) clinical practice guidelines and categorized as normal (< 90th percentile), elevated (≥ 90th percentile to < 95th percentile), or hypertensive (≥ 95th percentile). Bivariate multinomial logistic regression models assessed the relative risk ratio for potential correlates of blood pressure categorization and frequency distribution of parental awareness of blood pressure status was examined. RESULTS: Median child age was 8.1 years (IQR 6.5-9.9). Half were female, 61.8% were Latino and 15.8% were Non-Latino Black. Median body mass index (BMI) percentile was 83.6 (IQR 58.4-97.1) and 31.6% exceeded the 95th percentile. AAP criteria for hypertension and elevated blood pressure were met by 30.7% and 14.3% of children respectively. After full adjustment, the relative risk of categorization as hypertensive versus normal increased by a factor of 1.16 (95% CI 1.02-1.3) per 10-unit increase in BMI percentile, and 0.86 (95% CI 0.74-1.0) per one-year increase in age. Less than five parents (redacted due to low sample size) reported their child having a history of high blood pressure. CONCLUSIONS: In this low income, racially/ethnically diverse sample, we observed levels of hypertension and elevated blood pressure considerably higher than national estimates. However, in contrast, extremely low parental awareness was observed.

Improving quality of antenatal care services in a high case load tertiary care teaching hospital (Ganesh Shankar Vidyarthi Memorial (GSVM) Medical College) in Kanpur, Uttar Pradesh, India.

In India, half of all pregnant women between the ages of 15 and 49 years are anaemic. In Uttar Pradesh (UP), this figure is slightly higher at 51%. Unfortunately, only 5.4% pregnant women received full antenatal care (ANC) (National Family Health Survey 4, 2015-2016). A formative research conducted in UP in 2016 found that only 9% of pregnant women in UP consume the five recommended food groups, as per global recommendations.Ganesh Shankar Vidyarthi Memorial Medical College Hospital is one of the four high case load tertiary care facilities in Kanpur, UP, with an obstetrics and gynaecology (OBGY) outpatient department (OPD) of 2500-3000 consultations with delivery load of 250-300 deliveries per month and paediatric OPD of approximately 5400-6000 consultations per month. It was identified that pregnant women visiting the OPD for ANC were not receiving maternal nutrition-related services, and anthropometric measurements to assess nutritional status and gestational weight gain were also not done.The department of OBGY decided to apply the four-step Point of Care Quality Improvement (POCQI) approach using Plan-Do-Study-Act cycle for implementation of the maternal nutrition protocol during ANC.In April 2019, with the support of A&T, the hospital team applied the POCQI methodology to improve ANC service provision. By the end of 2019, the measurement and recording of anthropometric parameters increased to 84% and 74% for height and weight, respectively, from the baseline of zero. Hb testing increased from 58% to 84% and blood pressure (BP) monitoring from zero to 84%. Maternal nutrition counselling was delivered to 76% of the pregnant women visiting the OPD, which was a significant achievement for a new practice introduced into the system.The improved practices identified and implemented by the department are being sustained through active engagement of the staff and supportive leadership of the department of OBGY.

A highly efficient bilayer graphene/ZnO/silicon nanowire based heterojunction photodetector with broadband spectral response.

This paper presents three self-powered photodetectors namely, p+-bilayer graphene (BLG)/n+-ZnO nanowires (NWs), p+-BLG/n+-Si NWs/p--Si and p+-BLG/n+-ZnO NWs/p--Si. The Silvaco Atlas TCAD software is utilized to characterize the optoelectronic properties of all the devices and is validated by analytical modeling. The proposed dual-junction photodetectors cover broadband spectral response varying from ultraviolet to near-infrared wavelengths. The dual-heterojunction broadband photodetector exhibits photocurrent switching with the rise and fall time of 1.48 and 1.27 ns, respectively. At -0.5 V bias, the highest external quantum efficiency, photocurrent responsivity, specific detectivity, and the lowest noise equivalent power of 71%, 0.28 A W-1, 4.2 × 1012 cmHz1/2 W-1, and 2.59 × 10-17 W, respectively, are found for the dual-heterojunction device with a wavelength of 480 nm at 300 K. The proposed nanowires based photodetectors offer great potential to be utilized as next-generation optoelectronic devices.

Maternal and Obstetric Factors Associated with Low Birth Weight.

BACKGROUND: Low birth weight is a factor associated with perinatal, neonatal and post-neonatal morbidity and mortality and is associated with development of chronic diseases in adulthood. This study aimed to identify the maternal and obstetric factors associated with low birth weight in selected hospitals of Nepal. METHODS: Matched case control study was conducted in two tertiary level hospital of Nepal during May 2017 to April 2018. There were 368 mothers with single full term live low birth weight babies (cases) and 736 mothers with single full term live normal birth weight babies (controls) matched on babies' gender and place of delivery included in the study. Multivariable conditional logistic regression analysis was used to eliminate the effects of potential confounders and to identify the independent effect of various risk factors associated with low birth weight. RESULTS: A total of 1104 respondents (1 case : 2 controls) were included in the study. Multivariable conditional logistic regression analysis revealed that maternal height <146 cm [AOR 5.14, (95%CI:2.03-13.01),(p=0.001)], maternal weight ?50 kg [AOR 3.75,(95%CI:2.15-6.56), (p<0.001)], primi-parity [AOR 4.58, (95%CI:1.71-12.25),(p=0.002)], multi-parity [AOR 3.01,(95%CI: 1.11-8.12),(p=0.030)], rest in day time ?2 hours [AOR 3.68, (95%CI: 2.01-6.75),(p<0.001)], rest in night time for <8 hours [AOR 5.76, (95%CI: 2.32-14.33), (p<0.001)], Iron and folic acid consumption for ?60 days [AOR 5.47, (95%CI: 2.73-10.95),(p<0.001)], Iron and folic acid consumption for 61-120 days [AOR 3.04, (95%CI: 1.90-4.87),(p<0.001), no calcium consumption [AOR 3.00, (95%CI: 1.78-5.04),(p<0.001)] were the significant risk factors associated with Low birth weight Conclusions: Height and weight of women, parity, duration of rest in day time and night time, consumption of Iron and folic acid and calcium were the maternal and obstetric determinants for the occurrence of low birth weight.

Lithium-Induced Chronic Kidney Disease in a Pediatric Patient.

Lithium-induced nephropathy usually manifests in adulthood as it develops slowly after many years of cumulative exposure. There is very limited information available in pediatric patients. Renal function monitoring and timely intervention is the key in preventing lithium-induced chronic kidney disease in these patients. We report a case of a 14-year-old boy who was on lithium for almost 9 years for his complex psychiatric illness. He presented with increased urinary frequency and nocturia. His serum creatinine increased to 1.15 mg/dL (estimated glomerular filtration rate or eGFR 53 ml/min/1.73 m2) from a baseline of 0.78 mg/dL (eGFR 86 ml/min/1.73 m2) a year prior to this presentation. Results of the imaging study were consistent with lithium-induced nephropathy. He was managed conservatively. His serum creatinine returned to baseline of 0.78 mg/dL after a year of discontinuation of lithium, consistent with mild chronic kidney disease. This case highlights the fact that lithium-induced chronic kidney disease can present in pediatric age group when lithium is initiated at a young age in children and that timely intervention may prevent further progression of renal damage. In addition to drug levels, routine monitoring of renal function during lithium therapy is essential.

Differences in self-reported weekend catch up sleep between children and adolescents with and without primary hypertension.

BACKGROUND: The data on the association of sleep duration and blood pressure in the pediatric age group have been mixed and most studies have focused on weekday sleep duration. The purpose of this study was to compare the weekday and weekend sleep patterns between children and adolescents with newly diagnosed primary hypertension and a normotensive control group. METHODS: Children and adolescents from a pediatric nephrology clinic, aged 6-18 years with newly diagnosed primary hypertension were compared to an age and sex matched normotensive control group from a general pediatric clinic. The questions about bed time and getting out of bed times from the Pediatric Sleep Questionnaire (PSQ) were used to obtain weekday and weekend bed time, getting out of bed time and sleep duration. The Pediatric Daytime Sleepiness Scale (PDSS) was used to assess subjective sleepiness. RESULTS: In both groups of 60 subjects each, weekday total sleep time was similar. Subjects in both groups went to bed later and woke up later on the weekends. However, in the hypertensive group, weekend getting out of the bed time was earlier (8:52 AM ±93 min vs. 9:36 AM ±88 min, p = 0.013) and weekend catchup sleep was about 40 min less (62.8 ± 85.5 vs. 102.7 ± 84.9, p = 0.035). Hypertensive children perceived less subjective sleepiness (PDSS scores 8.28 ± 4.88 vs. 10.63 ± 5.41, p = 0.007). The p values were calculated after adjusting for body mass index (BMI), race, daytime nap, caffeine use, sleep related breathing disorder (SRBD) scale and periodic limb movement of sleep (PLMS) scale subcomponents of the PSQ. CONCLUSIONS: Hypertensive children obtained less weekend catch up sleep and reported less subjective sleepiness compared to the control group. More weekend sleep may potentially mitigate the effect of weekday sleep deprivation on blood pressure.

Bilayer graphene/HgCdTe based very long infrared photodetector with superior external quantum efficiency, responsivity, and detectivity.

We present a high-performance bilayer graphene (BLG) and mercury cadmium telluride (Hg1-x Cd x=0.1867Te) heterojunction based very long wavelength infrared (VLWIR) conductive photodetector. The unique absorption properties of graphene enable a long carrier lifetime of charge carriers contributing to the carrier-multiplication due to impact ionization and, hence, large photocurrent and high quantum efficiency. The proposed p+-BLG/n-Hg0.8133Cd0.1867Te photodetector is characterized and analyzed in terms of different electrical and optical characteristic parameters using computer simulations. The obtained results are further validated by developing an analytical model based on drift-diffusion, tunneling and Chu's methods. The photodetector has demonstrated a superior performance including improved dark current density (∼1.75 × 10-14 µA cm-2), photocurrent density (∼8.33 µA cm-2), internal quantum efficiency (QEint ∼ 99.49%), external quantum efficiency (QEext ∼ 89%), internal photocurrent responsivity (∼13.26 A W-1), external photocurrent responsivity (∼9.1 A W-1), noise equivalent power (∼8.3 × 10-18 W), total noise current (∼1.06 fA), signal to noise ratio (∼156.18 dB), 3 dB cut-off frequency (∼36.16 GHz), and response time of 9.4 ps at 77 K. Furthermore, the effects of different external biasing, light power intensity, and temperature are evaluated, suggesting a high QEext of 3337.70% with a bias of -0.5 V near room temperature.

Bilateral native nephrectomy reduces systemic oxalate level after combined liver-kidney transplant: A case report.

Primary hyperoxaluria type 1 (PH1) is a rare liver enzymatic defect that causes overproduction of plasma oxalate. Accumulation of oxalate in the kidney and subsequent renal failure are fatal to PH1 patients often in pediatric age. Combined liver and kidney transplantation is the therapy of choice for end-stage renal disease due to PH1. Levels of plasma oxalate remain elevated for several months after liver transplantation, as the residual body oxalate is slowly excreted. Patients with persistent hyperoxaluria after transplant often require hemodialysis, and accumulation of residual oxalate in the kidney can induce graft dysfunction. As the native kidneys are the main target of calcium oxalate accumulation, we postulated that removal of native kidneys could drastically decrease total body oxalate levels after transplantation. Here, we report a case of bilateral nephrectomy at the time of combined liver-kidney transplantation in a pediatric PH1 patient. Bilateral nephrectomy induced a rapid decrease in plasma oxalate to normal levels in less than 20 days, compared to the several months reported in the literature. Our results suggest that removal of native kidneys could be an effective strategy to decrease the need for hemodialysis and the risk of renal dysfunction after combined liver-kidney transplantation in patients with PH1.

Diagnostic Modalities of Precancerous and Cancerous Cervical Lesions with Special Emphasis on CD31 Angiogenesis Factor as a Marker.

Objectives. To evaluate the role of angiogenesis tumor marker CD31 in the detection of precancerous and cancerous cervical lesions and to compare its efficacy with colposcopy and histopathology. Materials and Methods. 230 patients with a suspicious looking cervix and an abnormal Pap smear attending the Outpatient Department of Obstetrics and Gynaecology of GSVM Medical College were subjected to a colposcopic examination. 180 patients with suspected colposcopic findings were subjected to a colposcopic directed biopsy. Biopsy tissues were sent for histopathological examination out of which 50 biopsied samples were sent for immunostaining of CD-31. Statistical analysis was done. Results. Comparison of microvessel density (MVD) count by haematoxylin and eosin staining (HE) and immunostaining of CD31 in preinvasive group were 4.012 ± 2.57 and 5.44 ± 2.21, respectively, and in invasive group were 9.18 ± 2.32 and 12.82 ± 4.07, respectively, which showed that MVD was higher by CD31 both in preinvasive and invasive group, and it was statistically significant. Conclusion. Angiogenesis is a marker of tumor progression, and CD31 fixes up vessel better as compared to HE, so aggressiveness of the tumor can be better predicted by MVD-CD31 as compared to MVD-HE.

Hyperhomocysteinemia as a Risk Factor for IUGR.

OBJECTIVE: To study the role of hyperhomocysteinemia in patients with intrauterine growth retardation. METHOD: 76 patients with intrauterine growth retardation were studied and compared with 50 controls which included pregnant patients without any pregnancy complications. Fasting Plasma homocysteine levels were measured and statistical analysis using tests of significance and logistic regression analysis was performed. Those in the study group were given homocysteine lowering agents for 6 wks and pregnancy outcome was studied. RESULTS: 57.8 % women in the study group were found to have hyperhomocysteinemia. Logistic Regression analysis shows an OR of 2.45 in favor of occurrence of IUGR if homocysteine levels are raised which is statistically significant. Mean plasma homocysteine levels decreased after treatment for 6 wks but this decrease in the case of placebo group is marginal whereas the decrease in the homocysteine levels the treatment group. This implies that treatment has a definitive role in lowering of plasma homocysteine levels. CONCLUSION: The present study shows that hyperhomocysteinemia is associated with IUGR and should be identified as a risk factor as correction favors pregnancy outcome.

Development and pilot testing of the challenge module: a proposed adjunct to the Gross Motor Function Measure for high-functioning children with cerebral palsy.

The aim was to develop a Challenge Module (CM) as a proposed adjunct to the Gross Motor Function Measure for children with cerebral palsy who have high-level motor function. Items were generated in a physiotherapist (PT) focus group. Item reduction was based on PTs' ratings of item importance and safety via online surveys. The proposed CM items were pilot-tested with children in Gross Motor Function Classification System Level I. The focus group identified 35 items for consideration. The first item-reduction survey (n = 86 PT respondents) resulted in 20 items. A second survey yielded two additional items. Seven pilot-test participants (6-14 years) had a CM total mean score of 74.5% (SD = 19.4). Three easy items were subsequently removed and two items combined. Of seven additional items suggested by the children during testing, two were accepted in a third item-reduction survey. The final result was a 20-item CM to evaluate advanced motor skills. The CM requires refinement through Rasch scaling and formal validation.

Anticancer activity of a peptide combination in gastrointestinal cancers targeting multiple neuropeptide receptors.

A novel peptide combination consisting of four synthetic neuropeptide analogs of Vasoactive Intestinal Peptide (VIP), Bombesin, Substance P and Somatostatin has been found to have potent anticancer activity in vitro and in vivo. The receptors of these four neuropeptides are known to be over expressed in various cancers. We have found the presence of native neuropeptides in the culture supernatant of the primary tumor cells of human colon adenocarcinomas. It was further demonstrated by receptor-ligand assays that not only do these tumor cells synthesize and secrete four peptide hormones but also possess specific high affinity receptors on their surface. Screening a large panel of analogs to the four peptide hormones on tumor cell proliferation led to the identification of four cytotoxic analogs, the combination of which was code-named DRF7295. The design and synthesis of the peptide analogs have been described in this paper. In vitro anticancer activity of DRF7295 was studied in a large panel of human tumor cells. Gastrointestinal tumor cells of the colon, pancreas and duodenum were found to be most sensitive to DRF7295 with moderate activity seen in glioblastoma, prostate, leukemia and those of oral cancer cells. Efficacy studies in xenograft models of colon and duodenum resulted in T/C% of less than 40%, which is indicative of strong tumor regressing potential of DRF7295 in gastrointestinal cancers. Acute and long-term toxicity studies as well as safety pharmacology studies conducted indicate the safety of the drug upon systemic administration with no significant adverse pharmacological effects.

Bombesin analogs containing alpha-amino-isobutyric acid with potent anticancer activity.

Six octapeptide bombesin (BN) analogs were synthesized by substituting alpha-aminoisobutyric acid (Aib), in place of Ala9 or Gly11, or both, in the [D-Phe6, desMet14]-BN (6-14) sequence: D-Phe6-Gln7-Trp8-Ala9-Val10-Gly11-His12-Leu13-NH2 (P0). Additionally, Leu13 was replaced with isoleucine in two analogs and one of the analogs was butanoylated at the N-terminus. The antiproliferative activity of the analogs was tested in vitro on human pancreatic (MiaPaCa-2) and colon cancer (SW620, HT29 and PTC) cell lines using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. The analogs demonstrated anticancer activity in the above cell lines at concentrations ranging from 0.01 nM to 1 microM. One of the analogs, P6, was evaluated for in vivo tumor regression in a xenograft model of human primary colon cancer in athymic nude mice and was found to cause significant reduction in tumor volume. NMR and molecular dynamics (MD) simulation studies for this analog revealed the presence of a mixed 3(10)/alpha-helical structure. This study demonstrates that the designed BN analogs retain their anticancer activity after the incorporation of the constrained amino acid, Aib, and are potential molecules for future use in cancer therapy and drug targeting.

Maturation of the Na+/H+ antiporter (NHE3) in the proximal tubule of the hypothyroid adrenalectomized rat.

In previous studies examining the role of glucocorticoids and thyroid hormone on the maturation of the Na(+)/H(+) antiporter (NHE3), we found attenuation in the maturational increase in proximal tubule apical Na(+)/H(+) antiporter activity but no change in NHE3 mRNA abundance in either glucocorticoid-deficient or hypothyroid rats. In addition, prevention of the maturational increase in either hormone failed to totally prevent the maturational increase in Na(+)/H(+) antiporter activity. We hypothesized that one hormone played a compensatory role when the other was deficient. The present study examined whether combined deficiency of thyroid and glucocorticoid hormones would completely prevent the maturation of the Na(+)/H(+) antiporter. Adrenalectomy was performed in 9-day-old hypothyroid Sprague-Dawley rats, a time before the normal postnatal maturational increase in these hormones occurs. Nine- and 30-day-old adrenalectomized (ADX), hypothyroid rats had comparable NHE3 mRNA abundance, which was 5- to 10-fold less than 30-day-old ADX, hypothyroid rats that received corticosterone-thyroxine replacement and 30-day-old sham control rats (P < 0.05). Brush-border membrane NHE3 protein abundance was comparable in 9- and 30-day-old ADX, hypothyroid groups and approximately 20-fold lower than both the 30-day replacement and 30-day sham groups (P < 0.05). Similarly, the replacement and sham groups had higher sodium-dependent proton secretion than 9- and 30-day-old ADX, hypothyroid groups (P < 0.05). We conclude that combined deficiency of both hormones totally prevents the maturational increase in NHE3 mRNA and protein abundance and Na(+)/H(+) antiporter activity.

Renal papillary necrosis induced by naproxen.

A 17-year-old healthy girl was admitted to our hospital with diffuse abdominal pain and decreased oral intake of about 11 days duration. About a week prior to admission, she had taken naproxen, 250 mg four times a day for 4 days. Physical examination was normal except for diffuse abdominal tenderness on deep palpation. Investigations revealed high serum BUN (42 mg/dl) and creatinine (4.0 mg/dl). Serum electrolytes and complement (C3, C4) levels and urinalysis were normal. Antinuclear-antibody and anti-dsDNA were negative. Kidney biopsy revealed renal papillary necrosis, acute tubular necrosis, and focal interstitial nephritis. A diagnosis of nonoliguric acute renal failure due to naproxen nephrotoxicity was made. She received intravenous hydration, and oral steroids, which was gradually discontinued in 3 months. A follow-up at 4 months revealed normal renal function with a serum creatinine of 1.1 mg/dl, BUN 7 mg/dl, and normal urinalysis. The report highlights a need for caution while using naproxen or any other nonsteroidal anti-inflammatory drugs, even for a short duration.

Kinetics and mechanism of Ru(III) and Hg(II) co-catalyzed oxidation of D-galactose and D-ribose by N-bromoacetamide in perchloric acid.

Kinetics of oxidation of reducing sugars D-galactose (Gal) and D-ribose (Rib) by N-bromoacetamide (NBA) in the presence of ruthenium(III) chloride as a homogeneous catalyst and in perchloric acid medium, using mercuric acetate as a scavenger for Br(minus sign) ions, as well as a co-catalyst, have been investigated. The kinetic results indicate that the first-order kinetics in NBA at lower concentrations tend towards zero order at its higher concentrations. The reactions follow identical kinetics, being first order in the [sugar] and [Ru(III)]. Inverse fractional order in [H(+)] and [acetamide] were observed. A positive effect of [Hg(OAc)(2)] and [Cl(minus sign)] was found, whereas a change in ionic strength (mu) has no effect on oxidation velocity. Formic acid and D-lyxonic acid (for Gal) and formic acid and L-erythronic acid (for Rib) were identified as main oxidation products of reactions. The various activation parameters have been computed and recorded. A suitable mechanism consistent with experimental findings has been proposed.