Artigos de revistas: "Effect of zinc on"

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Anjum, Kaukab, Asma Ali e Uzma Shahid. "PROTECTIVE EFFECT OF ZINC;". Professional Medical Journal 24, n.º 04 (6 de abril de 2017): 580–88. http://dx.doi.org/10.29309/tpmj/2017.24.04.1455.

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Background: Nutrition is an important determinant of bone health. Micronutrients,other than calcium has been paid less attention to-date in the prevention and treatment of bonediseases. Objective: To evaluate the protective effect of zinc on high salt induced gross changesin humerus and femur of rats. Study design: Analytical control randomized trial. Place andduration of study: Islamic International Medical College, Rawalpindi, hosted the research withthe cooperation of National Institute of Health; Islamabad. The study was approved by Ethicalreview committee of Riphah international university before its initiation. It took six months tocomplete the research (Sep 2015-March 2016). Material and methods: Forty five adult femaleSprague Dawley, 10-12 weeks old rats were used in the study. Three groups were made, eachhaving fifteen rats. Control group C (N=15) received laboratory diet without any alteration.Experimental group A (N=15) were served with high salt diet (8%NaCl) whereas experimentalgroup B (N=15) animals were given high salt diet augmented with zinc (50mg/kg/day).Allgroups were given the diet for eight weeks. Animals were weighed at the start and end ofstudy after which they were sacrificed. Left humeri and femora of all rats were obtained. Weightand mid shaft diameters of bones were recorded. The results were compiled after comparisonamongst all the groups. Results: Marked gross changes were witnessed in experimentalgroups. These changes were of greater severity in high salt diet group as compared to the zincsupplemented group in which reverse beneficial effects were noticed. After zinc administration,there was substantial increase in the weight of animals and bones with concurrent increase inmid shaft diameters. Conclusion: Zinc has a Protective role against high salt induced damageon the gross parameters of bones.

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Fatma Tugce Senberber Dumanli, Fatma Tugce Senberber Dumanli, Azmi Seyhun Kipcak Azmi Seyhun Kipcak e Duygu Sena Vardar and Nurcan Tugrul Duygu Sena Vardar and Nurcan Tugrul. "Ultrasonic-Assisted Synthesis of Zinc Borates: Effect of Boron Sources". Journal of the chemical society of pakistan 42, n.º 6 (2020): 839. http://dx.doi.org/10.52568/000703.

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Sonochemistry meaning ultrasound-assisted chemistry plays an important role in the synthesis of inorganic compounds. Among these inorganic compounds, zinc borates are used for the flame-retarding agent. In this study using zinc chloride (ZnCl2), boric acid (H3BO3), Na2B4O7and#183;10H2O, Na2B4O7and#183;5H2O and NaOH as raw materials, a zinc borate compound in the formulae of Zn3B6O12and#183;3.5H2O was obtained using an ultrasonic probe. Crystal structures of samples were identified using X-ray diffraction (XRD). The symmetric and asymmetric stretching between boron and oxygen atoms were searched by Fourier-transform infrared (FT-IR) and Raman spectroscopies. The effects of boron sources on sample morphology were examined by scanning electron microscopy (SEM). From the results, it was seen that Zn3B6O12and#183;3.5H2O can easily be produced from these raw materials with the synthesis parameters of 80-90and#176;C and 40-55 min. From the SEM results, it was seen that the minimum particle size obtained was 172 nm. Reaction efficiencies were calculated between 79.6 and 94.0 and#177; 0.5%. Thermal feature of the obtained pure phase, investigated with the thermogravimetric analyses. The dehydration of the synthesized Zn3B6O12and#183;3.5H2O was seen between 262 and 413and#176;C with a total mass loss of 13.25%.

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Fatma Tugce Senberber Dumanli, Fatma Tugce Senberber Dumanli, Azmi Seyhun Kipcak Azmi Seyhun Kipcak e Duygu Sena Vardar and Nurcan Tugrul Duygu Sena Vardar and Nurcan Tugrul. "Ultrasonic-Assisted Synthesis of Zinc Borates: Effect of Boron Sources". Journal of the chemical society of pakistan 42, n.º 6 (2020): 839. http://dx.doi.org/10.52568/000703/jcsp/42.06.2020.

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Sonochemistry meaning ultrasound-assisted chemistry plays an important role in the synthesis of inorganic compounds. Among these inorganic compounds, zinc borates are used for the flame-retarding agent. In this study using zinc chloride (ZnCl2), boric acid (H3BO3), Na2B4O7and#183;10H2O, Na2B4O7and#183;5H2O and NaOH as raw materials, a zinc borate compound in the formulae of Zn3B6O12and#183;3.5H2O was obtained using an ultrasonic probe. Crystal structures of samples were identified using X-ray diffraction (XRD). The symmetric and asymmetric stretching between boron and oxygen atoms were searched by Fourier-transform infrared (FT-IR) and Raman spectroscopies. The effects of boron sources on sample morphology were examined by scanning electron microscopy (SEM). From the results, it was seen that Zn3B6O12and#183;3.5H2O can easily be produced from these raw materials with the synthesis parameters of 80-90and#176;C and 40-55 min. From the SEM results, it was seen that the minimum particle size obtained was 172 nm. Reaction efficiencies were calculated between 79.6 and 94.0 and#177; 0.5%. Thermal feature of the obtained pure phase, investigated with the thermogravimetric analyses. The dehydration of the synthesized Zn3B6O12and#183;3.5H2O was seen between 262 and 413and#176;C with a total mass loss of 13.25%.

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Sair, Mohammad, Asma Inam, Sabahat Gul, Raheela Adil, Muhammad Adnan Sadiq e Muhammad Sajid Khan. "Effect of Zinc on Spermatogenesis". Pakistan Journal of Medical and Health Sciences 16, n.º 1 (16 de janeiro de 2022): 43–45. http://dx.doi.org/10.53350/pjmhs2216143.

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Aim: To determine the effect of zinc on spermatogenesis Methodology: the study was done at Shahida Islam Medical Complex, Lodhran. 60 albino rats were selected and divided into 4 groups each consisting of 15 albino rats each. The first control group-1 was feed with normal diet, while the group-2 and group-3 were treated with indomethacin and zinc respectively. Whereas the group-4 was treated with both zinc and indomethacin. This intervention was carried out for 12 weeks. Once the study was concluded, the rats were euthanized and histopathological analysis of the testes was carried out to determine the effect on spermatogenesis. Results: group 4 showed favorable results in which normal spermatogenesis could be observed, in group 2 however, focal loss of germ cells series was seen as well as focal basement membrane detachment. Conclusion: the study can safely say that zinc metal exhibits a protective role on the testes of albino rats Keywords: Spermatogenesis, Albino rats, Zinc, Indomethacin, Sertoli cells

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WAKAMATSU, Jun-ichi, Ayana KATO, Misako EZOE e Takanori NISHIMURA. "Effect of zinc protoporphyrin IX on dietary zinc bioavailability". Nihon Chikusan Gakkaiho 86, n.º 4 (2015): 481–89. http://dx.doi.org/10.2508/chikusan.86.481.

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Phutphongsai, Anusorn, e Sirirat Wacharawichanant. "F-2 EFFECT OF ZINC OXIDE ON THE MECHANICAL PROPERTIES OF COMPATIBILIZED POLYPROPYLENE/ZINC OXIDE COMPOSITES(Session: Composites I)". Proceedings of the Asian Symposium on Materials and Processing 2006 (2006): 117. http://dx.doi.org/10.1299/jsmeasmp.2006.117.

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Benrashid, Ramazan, Gordon L. Nelson, Donald J. Ferm e Leland W. Chew. "Effect of Zinc, Zinc Oxide and Zinc Borate on the Flammability of Polycarbonate". Journal of Fire Sciences 13, n.º 3 (maio de 1995): 224–34. http://dx.doi.org/10.1177/073490419501300305.

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Polycarbonate was blended with zinc, zinc borate (2ZnO·3B2O 3·3.5H2O) and zinc oxide. Blends made of zinc/polycarbonate and especially zinc borate/polycarbonate show major improvement in oxygen index values. Ohio State University (OSU) heat release studies show reduction in heat release only for zinc borate/polycarbonate blends compared to virgin polycarbonate. No improvement in smoke suppression was observed from NBS Smoke Chamber studies for these blends. From DSC studies there was a low ering of Tg's. Thermogravimetric analyses show the blends have lower tempera ture stability in nitrogen (50% weight loss) compared to a control.

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Vasilyev, D. V. "EFFECT OF ZINC CONTAMINATED SOIL ON THE SEEDS PROGENY ABOUT BARLEY". European Journal of Natural History, n.º 1 2021 (2021): 3–6. http://dx.doi.org/10.17513/ejnh.34140.

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Li, Mei, Jian Chun Jiang, Shou Hai Li, Kun Huang e Jian Ling Xia. "Study on Synthesis and Synergetic Effect of Novel Bio-Based PVC Thermal Stabilizer from Dimer Fatty Acid and Polymerized Rosin". Advanced Materials Research 721 (julho de 2013): 173–76. http://dx.doi.org/10.4028/www.scientific.net/amr.721.173.

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Calcium zinc monomer salts were prepared via simple one-step double decomposition reaction with the aid of DA and PR as raw materials. FTIR analysis demonstrated that calcium zinc monomer salts of DA and PR have been successfully synthesized. The synergistic effect between DA-based and PR-based calcium zinc monomer salts, the effects of addition amount of DOP and the synergistic effects between epoxidized soybean oil (ESO) and calcium/zinc stabilizers on thermal stability of PVC were analyzed by means of the Congo-red paper, torque rheometer and thermogravimetric analysis methods. The results showed that preferable synergistic stabilizing effects were observed when DA calcium/zinc salt and polymerized rosin calcium/zinc salt were used together. In addition, appropriate dosage of DOP could inhibit the thermal degradation of PVC, and ESO also have certain synergetic effect with prepared novel calcium/zinc stabilizers.

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Aisyah, S., e M. Tafsin. "The effect of vitamin C and zinc supplementation on performance and physiology of joper at various density of cages". IOP Conference Series: Earth and Environmental Science 977, n.º 1 (1 de junho de 2022): 012129. http://dx.doi.org/10.1088/1755-1315/977/1/012129.

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Abstract Vitamin C and zinc have an important role in the environment and the sustainability of chicken production. The purpose of this study was to determine the response of vitamin C and zinc supplementation to the performance and physiology of joper at various density of cage. A total of 324 experimental (unsex) chicken were used in this study. The experimental design used a complete randomized design of factorial pattern consisting of 2 factors, factor A was vitamin C and zink supplementation and factor B was cage of density, each treatment was repeated 3 times. The data were analyze by analysis of variance and continued with Dunan’s test if there was a significant effect of 0.05% level. The results showed that vitamin C and zinc supplementation had no significant effect (P>0.05) on ration consumption, body weight gain, ration conversion, rectal temperature and respiratory frequency. The parameter of densities the cage had a significant effect (P<0.05). Conclusions that vitamin C and zinc supplementation had no significant effect on the performance and physiology of joper and there was interaction on rectal temperature when vitamin C and zinc supplementation and density of cage were applied together.

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Miroslav, Šlosár, Mezeyová Ivana, Hegedüsová Alžbeta, Andrejiová Alena, Kováčik Peter, Lošák Tomáš, Kopta Tomáš e Keutgen Anna J. "Effect of zinc fertilisation on yield and selected qualitative parameters of broccoli". Plant, Soil and Environment 63, No. 6 (14 de junho de 2017): 282–87. http://dx.doi.org/10.17221/220/2017-pse.

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Three treatments were used in two-year (2014–2015) field experiments with broccoli cv. Bejo 2914 F1: (1) untreated control; (2) Zn0.75 – Zinkuran SC as foliar fertiliser at the rate of 0.75 L/ha (375 g Zn/ha); (3) Zn1.50 – Zinkuran SC as foliar fertiliser at the rate of 1.50 L/ha (750 g Zn/ha). The statistically significant differences of individual broccoli parameters were found after zinc applications. In both experimental years the yield of broccoli with additional zinc fertilisation was significantly higher by about 8.2–14.4% (Zn0.75) and 12.5–17.5% (Zn1.50), respectively, than in the control. Foliar zinc application significantly increased the sulforaphane content in broccoli florets by about 19.8–32.9% (Zn0.75) and 37.2–49.3% (Zn1.50), respectively, compared to the control. By contrast, the content of total polyphenolics (of about 9.0–12.5% (Zn0.75) and 33.9–35.2% (Zn1.50)) and antioxidant activity (Zn0.75 (3.7–4.2%) and Zn1.50 (5.3–7.0)) decreased as a result of zinc fertilisation. The investigations pointed to zinc as a very important micronutrient with strong influence on the yield and chosen qualitative, health promoting parameters of broccoli.

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Hemilä, Harri. "Zinc lozenges and the common cold: a meta-analysis comparing zinc acetate and zinc gluconate, and the role of zinc dosage". JRSM Open 8, n.º 5 (maio de 2017): 205427041769429. http://dx.doi.org/10.1177/2054270417694291.

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Objective To compare the efficacy of zinc acetate lozenges with zinc gluconate lozenges in common cold treatment and to examine the dose-dependency of the effect. Design Meta-analysis. Setting Placebo-controlled zinc lozenge trials, in which the zinc dose was > 75 mg/day. The pooled effect of zinc lozenges on common cold duration was calculated by using inverse-variance random-effects method. Participants Seven randomised trials with 575 participants with naturally acquired common colds. Main outcome measure Duration of the common cold. Results The mean common cold duration was 33% (95% CI 21% to 45%) shorter for the zinc groups of the seven included trials. Three trials that used lozenges composed of zinc acetate found that colds were shortened by 40% and four trials that used zinc gluconate by 28%. The difference between the two salts was not significant: 12 percentage points (95% CI: −12 to + 36). Five trials used zinc doses of 80–92 mg/day, common cold duration was reduced by 33%, and two trials used zinc doses of 192–207 mg/day and found an effect of 35%. The difference between the high-dose and low-dose zinc trials was not significant: 2 percentage points (95% CI: −29 to + 32). Conclusions Properly composed zinc gluconate lozenges may be as effective as zinc acetate lozenges. There is no evidence that zinc doses over 100 mg/day might lead to greater efficacy in the treatment of the common cold. Common cold patients may be encouraged to try zinc lozenges for treating their colds. The optimal lozenge composition and dosage scheme need to be investigated further.

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Zewide, Israel, e Abde Sherefu. "Review Paper on Effect of Micronutrients for Crop Production". Nutrition and Food Processing 4, n.º 7 (13 de novembro de 2021): 01–08. http://dx.doi.org/10.31579/2637-8914/063.

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Micronutrients are essentially as important as macronutrients to have better growth, yield and quality in plants. There requirement by plants is in trace amounts. Boron, iron, copper, zinc, manganese, magnesium and molybdenum constitute main micronutrients required by different crops in variable quantities. The requirement of micronutrients is partly met from the soil or through chemical fertilizer or through other sources. Various physical and metabolic functions are governed by these mineral nutrients. Boron is particularly essential in pollen germination, copper plays major role in photosynthesis and increases sugar content in fruits, chlorophyll synthesis and phosphorus availability is enhanced by manganese, iron acts as an oxygen carrier and promotes chlorophyll formation, while, zinc aids plant growth hormones and enzyme system. Yield and quality of agricultural products increased with micronutrients application, therefore human and animal health is protected with feed of enrichment plant materials. Each essential element only when can perform its role in plant nutrition properly that other necessary elements are available in balanced ratios for plant. therefore in the plant manganese plays an important role on oxidation and reduction processes, as electron transport in photosynthesis. Manganese deficiency has very serious effects on non-structural carbohydrates, and roots carbohydrates especially. Crops quality and quantity decreased due to manganese deficiency, and this is due to low fertility of pollen and low in carbohydrates during grain filling. In the xylem routes zinc is transmitted to divalent form or with organic acids bond. In the phloem sap zinc makes up complex with organic acids with low molecular weight, and increases its concentration. Zinc deficiency can be seen in eroded, calcareous and weathering acidic soils. Zinc deficiency is often accompanied with iron deficiency in calcareous soils. Iron in the soil is the fourth abundant element on earth, but its amount was low or not available for the plants and microorganisms needs, due to low solubility of minerals containing iron in many places the world, especially in arid region with alkaline soils.

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Prasad, Ananda S. "Zinc in Human Health: Effect of Zinc on Immune Cells". Molecular Medicine 14, n.º 5-6 (3 de abril de 2008): 353–57. http://dx.doi.org/10.2119/2008-00033.prasad.

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MOCCHEGIANI, E., R. GIACCONI, C. CIPRIANO, L. COSTARELLI, E. MUTI, S. TESEI, C. GIULI et al. "Zinc, Metallothioneins, and Longevity:: Effect of Zinc Supplementation: Zincage Study". Annals of the New York Academy of Sciences 1119, n.º 1 (1 de novembro de 2007): 129–46. http://dx.doi.org/10.1196/annals.1404.030.

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Davie, R. J., J. D. Phillips e N. J. Birch. "The effect of zinc-histidine ratios on zinc intestinal absorption." Journal of Inorganic Biochemistry 43, n.º 2-3 (agosto de 1991): 686. http://dx.doi.org/10.1016/0162-0134(91)84653-q.

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Robson, AD, e K. Snowball. "The effect of chlorsulfuron on the uptake and utilization of copper and zinc in wheat". Australian Journal of Agricultural Research 41, n.º 1 (1990): 19. http://dx.doi.org/10.1071/ar9900019.

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The effect of the herbicide chlorsulfuron on the uptake and utilization of copper and zinc by wheat was examined in a series of glasshouse experiments. Application of chlorsulfuron induced symptoms of both copper and zinc deficiencies, and decreased copper and zinc concentrations within shoots. Chlorsulfuron accentuated deficiencies of copper and zinc by decreasing uptake of the micronutrients rather than by affecting their utilization within the plant. Effects of chlorsulfuron in decreasing uptake of copper and zinc did not appear to be due to effects on root weight or root length. However, chlorsulfuron appeared to decrease water uptake by roots, indicating that chlorsulfuron may have decreased copper and zinc uptake by effects on root morphology or root physiology.

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King, Janet C., David M. Shames, Nicola M. Lowe, Leslie R. Woodhouse, Barbara Sutherland, Steve A. Abrams, Judith R. Turnlund e Malcolm J. Jackson. "Effect of acute zinc depletion on zinc homeostasis and plasma zinc kinetics in men". American Journal of Clinical Nutrition 74, n.º 1 (1 de julho de 2001): 116–24. http://dx.doi.org/10.1093/ajcn/74.1.116.

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Wang, J. H., C. C. Wu e J. Feng. "Effect of dietary antibacterial peptide and zinc-methionine on performance and serum biochemical parameters in piglets". Czech Journal of Animal Science 56, No. 1 (20 de janeiro de 2011): 30–36. http://dx.doi.org/10.17221/341/2009-cjas.

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The objective of this study was to evaluate the effect of dietary supplementation of antibacterial peptide and zinc methionine on performance and some serum biochemical parameters of weaned piglets. Rongchang male piglets (28 days of age, initial weight 8.4 ± 0.65 kg) were used. All piglets were randomly allotted to four diets including the control group, the antibacterial peptide (AP) group containing 10 mg antibacterial peptide/kg diet, the zinc methionine (Zn-Met) group with 1 200 zinc methionine/kg diet (equal to 200 mg Zn2+/kg diet), the zinc methionine/antibacterial peptide (Zn/AP) group containing 10 mg antibacterial peptide and 1 200 mg zinc methionine/kg diet, respectively, in a 4-week feeding experiment. Each of these groups consisted of six replications with 8 pigs per replication. Average daily gain (ADG) and average daily feed intake (ADFI) both improved in the antibacterial peptide group (P < 0.05, P < 0.05), zinc methionine group (P < 0.05, P < 0.05) and zinc methionine/antibacterial peptide group (P < 0.01, P < 0.05), as compared with the control. Dietary zinc methionine also significantly reduced the diarrhoea ratio of piglets (P < 0.05). The serum immunoglobulin G (IgG) and superoxide dismutase (SOD) were increased (P < 0.05) and total cholesterol (TC) decreased (P < 0.05) in the antibacterial peptide group and zinc-methionine group, the high density lipoprotein (HDL) increased (P < 0.05) in the zinc methionine group, as compared with the control. The results indicated that antibacterial peptide and zinc methionine were effective in improving growth performance, enhancing immune function, blood vessel function and antioxidant enzyme activity of piglets.

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Wyszkowska, J., A. Borowik, J. Kucharski, M. Baćmaga, M. Tomkiel e E. Boros-Lajszner. "The effect of organic fertilizers on the biochemical properties of soil contaminated with zinc". Plant, Soil and Environment 59, No. 11 (7 de novembro de 2013): 500–504. http://dx.doi.org/10.17221/537/2013-pse.

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This study evaluates the effectiveness of organic fertilizers in restoring the homeostasis of soils contaminated with zinc. The activity of selected enzymes participating in the transformation of carbon, nitrogen, phosphorus and sulfur and the sensitivity of white mustard plants to zinc were analyzed. A greenhouse pot experiment was carried out. Uncontaminated soil served as control. Six organic substances which potentially neutralize the adverse effects of zinc were used: tree bark, finely ground barley straw, pine sawdust, cattle manure, compost and cellulose. It was found that in less contaminated soil (300 mg Zn2+/kg), all of the analyzed organic substances minimized zinc adverse effects on the biochemical properties of soil, including the activity of dehydrogenases, catalase, urease, acid phosphatase, alkaline phosphatase, β-glucosidase and arylsulfatase. In more contaminated soil (600 mg Zn2+/kg), the negative consequences of zinc pollution were effectively mitigated only by cellulose, barley straw and manure. Cellulose had the highest soil restoration potential, as demonstrated by resistance indicator values for different enzymes. Cellulose, compost, manure and straw increased the resistance of white mustard plants to zinc, but only in treatments contaminated with 300 mg Zn2+/kg. Bark and sawdust potentiated zinc toxic effects on mustard plants.

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Suara, Rahaman O., e James E. Crowe. "Effect of Zinc Salts on Respiratory Syncytial Virus Replication". Antimicrobial Agents and Chemotherapy 48, n.º 3 (março de 2004): 783–90. http://dx.doi.org/10.1128/aac.48.3.783-790.2004.

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ABSTRACT Zinc supplementation decreases the morbidity of lower respiratory tract infection in pediatric patients in the developing world. We sought to determine if zinc mediates a specific inhibitory effect against the major cause of pediatric lower respiratory tract disease, respiratory syncytial virus (RSV). We determined the in vitro inhibitory effect of three zinc salts (zinc acetate, lactate, and sulfate) on the replication of RSV at various concentrations of 10 and 1 mM and 100 and 10 μM. The degree of inhibition of RSV replication was examined in the presence of zinc during preincubation, adsorption, or penetration and was compared with that caused by salts of other divalent cations. Complete inhibition of RSV plaque formation was observed at 1 and 10 mM, representing reductions that were ≥106-fold. At the lowest concentration tested, 10 μM, we observed ≥1,000-fold reductions in RSV yield when zinc was present during preincubation, adsorption, penetration, or egress of virus. The therapeutic indices, determined as ratios of 50% toxicity concentration to 50% inhibitory concentration, were 100, 150, and 120 for zinc acetate, zinc lactate, and zinc sulfate, respectively. The inhibitory effect of zinc salts on RSV was concentration dependent and was not observed with other salts containing divalent cations such as calcium, magnesium, and manganese. RSV plaque formation was prevented by pretreatment of HEp-2 cell monolayer cultures with zinc or by addition of zinc to methylcellulose overlay media after infection. The results of this study suggest that zinc mediates antiviral activity on RSV by altering the ability of the cell to support RSV replication.

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Shapoval, Pavlo, Martyn Sozanskyi, Iosyp Yatchyshyn, Bogdan Kulyk, Mykhaylo Shpotyuk e Roman Gladyshevskii. "The Effect of Different Complexing Agents on the Properties of Zinc Sulfide Thin Films Deposited from Aqueous Solutions". Chemistry & Chemical Technology 10, n.º 3 (15 de setembro de 2016): 317–23. http://dx.doi.org/10.23939/chcht10.03.317.

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The zinc sulfide (ZnS) thin films were prepared on glass substrates by chemical bath deposition using the aqueous solutions of zinc chloride, thiourea, pH regulator and complexing agent (ammonia and hydrazine hydrate, trisodium citrate or sodium hydroxide). The calculations of boundary conditions for formation of zinc sulfide and zinc hydroxide were made at various zinc salt concentrations with different complexing agents. The structural, morphology and optical properties of the ZnS thin films were investigated. The thickness of ZnS films was measured and the recalculation of zinc mass per cm2 of the substrate surface was held for comparison. The deposition mechanism is discussed.

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Hassan, Nada Tahseen, e Dlair Abdulkhaleq Chalabi. "Effect of zinc supplementation on growth of preterm infants". Advanced medical journal 6, n.º 2 (9 de junho de 2022): 1–9. http://dx.doi.org/10.56056/amj.2022.131.

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Background and objectives: Nutritional deficits are almost universal in low-birth weight babies. This study aimed to show the effect of zinc supplementation on growth and certain hematological parameters in preterm infants. Methods: The current case-control study was carried out on 80 healthy preterm infants below 37 weeks of age divided into two groups. The first group was a zinc-supplemented group fed with breast milk exclusively and supplemented with zinc (2 mg/kg/day) since the first day of life. The second group was a non-zinc-supplemented group fed with breast milk exclusively (without zinc supplementation). Both groups were followed up at the age of 4 months for monitoring growth and determining serum zinc and hemoglobin levels. Results: With the beginning of the study; there was no significant statistical difference between the zinc supplemented & non zinc supplemented groups in weight (2.4±0.2 kg vs 2.5±0.4kg), length (45.0±1.6 cm vs 45.2±1.5 cm) and occipitofrontal circumference (31.5±1.2 cm vs 31.5±1.1cm) respectively, but there was statistical significant difference at 4 months follow up with regard to weight (6.2±0.3 kg vs 6.0±0.2 kg) and length (63.2±2.1 cm vs 61.1±2.0 cm). Also, there was a highly significant increase in serum hemoglobin levels (11.7±1.6 gm/dl vs 10.6±1.5 gm/dl) and serum zinc level (101.2±8.1 µg/dl vs 84.1±7.0 µg/dl) in the zinc-supplemented group compared to the non-zinc-supplemented group at 4 months follow up. Conclusion: Zinc supplementation was found to be effective to enhance the growth as well as increasing serum zinc and hemoglobin levels in early months of life of preterm infants.

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Guo, Z., X. Guo, J. Wang e D. Wang. "Occlusive effect of soil aggregates on increased soil DTPA-extractable zinc under low soil pH causedby long-term fertilization". Plant, Soil and Environment 59, No. 11 (7 de novembro de 2013): 524–29. http://dx.doi.org/10.17221/489/2013-pse.

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To investigate the effect of low soil pH caused by fertilization on soil available zinc in calcareous soil, this study was conducted based on a long-term experiment consisting of: (a) no fertilization (CT); (b) mineral fertilizer application coupled with 7500 kg/ha of wheat straw (WS-NPK); (c) mineral fertilizer application coupled with 3750 kg/ha of wheat straw (1/2WS-NPK); (d) mineral fertilizer application alone (NPK). Long-term fertilization results in a significant increase in soil DTPA-extractable zinc. However, the increased soil DTPA-extractable zinc is unavailable to crops and mainly confined to 0.25 mm > and 0.25 mm to 1 mm aggregates. Compared to CT, soil DTPA-extractable zinc under fertilization is more than 9.67% and 122.36% higher in 0.25 mm > and 0.25 mm to 1 mm aggregates, respectively. Furthermore, plant-available zinc in the 0–15 cm soil layer and wheat grain zinc are both significantly positive related to soil DTPA-extractable zinc in > 2 mm aggregates. Therefore, plant-available zinc in the 0–15 cm layer is closely associated with DTPA-extractable zinc in > 2 mm aggregates, and the low soil pH caused by long-term fertilization could not enhance plant-available zinc in the surface soil layer nor elevate wheat grain zinc concentration because of the occlusive effect of soil aggregates.

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Dittmer, J., e C. Bauer. "Inhibitory effect of zinc on stimulated erythropoietin synthesis in HepG2 cells". Biochemical Journal 285, n.º 1 (1 de julho de 1992): 113–16. http://dx.doi.org/10.1042/bj2850113.

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The effect of zinc on erythropoietin (EPO) synthesis in HepG2 cells was investigated. The increase in EPO synthesis induced by Co2+ (50 microM), Ni2+ (300 microM) or oxygen (1% O2) was inhibited by the presence of ZnCl2 (50-150 microM) in the tissue-culture medium, whereas basal EPO synthesis was unaffected. The effect was reflected by corresponding changes in the EPO mRNA level. These effects of zinc on EPO synthesis could not be mimicked by CdCl2 (less than or equal to 2 microM). Addition of FeCl3 to the medium appeared to decrease the inhibitory effect of zinc on hypoxia-induced EPO synthesis, implying that zinc may interfere with an iron-dependent step in EPO regulation.

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Verma, Asha, e Ranjana Pateriya. "Effect of Zinc on Road Side Useful Plant Leaves in Bhopal District". International Journal of Scientific Research 3, n.º 8 (1 de junho de 2012): 419–20. http://dx.doi.org/10.15373/22778179/august2014/127.

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Herzig, I., M. Navrátilová, J. Totušek, P. Suchý, V. Večerek, J. Blahová e Z. Zralý. "The effect of humic acid on zinc accumulation in chicken broiler tissues". Czech Journal of Animal Science 54, No. 3 (20 de março de 2009): 121–27. http://dx.doi.org/10.17221/1676-cjas.

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Thirty-six selected male chickens were allocated into four groups C, HA, ZN, ZN + HA, and the experiment was initiated after 4 days of an adaptation period. Group C was fed a complete feed mixture without supplements. Group HA was fed the same diet with 500 mg of humic acid per chicken and day. Group ZN was loaded with 240 mg Zn (as 600 mg ZnSO4) per chicken and day, and birds of the group ZN + HA were loaded as those of the latter group, with additional 500 mg of humic acid per chicken and day. The treatments were carried out for 10 days. Subsequently, the chickens were slaughtered and samples of liver, kidneys, leg muscles and blood were collected for Zn level assessment. The Zn levels detected in group C can be considered as the background value, found commonly in broiler chickens fed the complete feed mixtures enriched with trace elements. The following concentrations were detected (mg Zn/kg): 40.1 ± 13.4 in muscles, 81.0 ± 6.6 in kidneys, 72.2 ± 15.0 in liver, and in blood serum 1.04 ± 0.45 mg Zn/l. Increased Zn levels by 11 to 30% (P > 0.05) compared to group C were found in group HA in all tissues studied. The ten-day treatment with 600 mg ZnSO4 (240 mg Zn/day, i.e. 2 400 mg Zn per 10 days) resulted in increased Zn levels in all investigated tissues, significantly in kidneys (P < 0.01), liver (P < 0.01) and blood serum (P < 0.01). The mean levels 430.5 ± 159.0, 149.8 ± 41.9 and 57.9 ± 22.7 mg Zn/kg, and 4.14 ± 0.9 mg/l were found in liver, kidneys, leg muscles, and blood serum, respectively. After the same treatment with zinc sulphate together with humic acid (group ZN + HA), no significant changes of Zn levels in the investigated tissues were reported. Concentrations of the selected parameters of metabolism in chickens ranged within the reference limits; significant differences between experimental and control groups (cholesterol P < 0.05; lactate P < 0.05; calcium P < 0.01) were found sporadically.

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Robson, AD, e K. Snowball. "The effect of 2-(4-2′,4′-dichlorophenoxy-phenoxy)-methyl propanoate on the uptake and utilization of zinc by wheat". Australian Journal of Agricultural Research 40, n.º 5 (1989): 981. http://dx.doi.org/10.1071/ar9890981.

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The effect of the herbicide diclofop-methyl on the uptake and utilization of zinc by wheat was examined in a series of glasshouse experiments. Application of diclofop-methyl to soil induced symptoms of zinc deficiency and decreased zinc concentrations within shoots. Effects of the herbicide application in decreasing plant growth were more marked at marginal levels of zinc than at adequate levels. The application of diclofop-methyl to the soil induced zinc deficiency by decreasing the uptake of zinc from soil rather than by effects on the utilization of zinc within the plant. The application of diclofop-methyl to leaves with no contamination of the soil did not affect the zinc status of the plant. Effects of diclofopmethyl in decreasing zinc uptake did not appear to be due to effects of the herbicide on root weight or root length.In the field, diclofop-methyl is sprayed on crops with low leaf areas, hence a high proportion of the herbicide will reach the soil. It is thus likely that in field crops application of diclofop-methyl will induce zinc deficiency where the supply of zinc for the crop is marginal.

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Dunn, M. A., e R. J. Cousins. "Kinetics of zinc metabolism in the rat: effect of dibutyryl cAMP". American Journal of Physiology-Endocrinology and Metabolism 256, n.º 3 (1 de março de 1989): E420—E430. http://dx.doi.org/10.1152/ajpendo.1989.256.3.e420.

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N6,2'-O-dibutyryladenosine 3',5'-cyclic monophosphate (Bt2cAMP) administration to rats is shown to reduce serum zinc levels and increase liver zinc and metallothionein significantly. Such redistribution is similar to that seen in the acute phase response to stress. To determine the sites of regulation of zinc metabolism involved in zinc redistribution, we compared the kinetics of intravenously administered 65Zn between control and Bt2cAMP-treated rats. 65Zn disappeared more rapidly from the plasma of Bt2cAMP rats, whereas 65Zn content of liver and liver metallothionein was increased. 65Zn in spleen and bone marrow also increased. No change was seen in muscle or kidney, and 65Zn content decreased in skin, bone, small intestine, and feces. These kinetic data were integrated into two compartmental models describing zinc metabolism in control and Bt2cAMP-treated states. Models were constructed using the SAAM and CONSAM modeling programs. Comparison of models suggest several sites of regulation due to Bt2cAMP. Zinc uptake into liver metallothionein from both plasma and other zinc pools within the liver was increased, whereas the release of metallothionein-bound zinc to plasma decreased. These changes increased liver zinc at the expense of plasma zinc, tissue zinc (principally skin, bone, and small intestine), and fecal zinc excretion. Bone marrow, spleen, and muscle were protected against zinc loss due primarily to decreased rates of tissue zinc loss. It was also postulated that Bt2cAMP increased the transfer of liver zinc to secreted alpha 2-macroglobulin. These results demonstrate that Bt2cAMP-induced zinc redistribution is tissue specific and related in part to metallothionein synthesis.

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Samardzic, Janko, Kristina Savic, Nemanja Stefanovic, Radomir Matunovic, Dragana Baltezarevic, Miljana Obradovic, Jasna Jancic, Dejan Opric e Dragan Obradovic. "Anxiolytic and antidepressant effect of zinc on rats and its impact on general behavioural parameters". Vojnosanitetski pregled 70, n.º 4 (2013): 391–95. http://dx.doi.org/10.2298/vsp111129036s.

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Background/Aim. Zinc is an essential element which has considerable interaction with gamma-aminobutyric acid A type receptors (GABAA) and glutamate receptors in the central nervous system (CNS). It is believed that zinc acts as a potent inhibitor of glutamate N-methyl-D-aspartate (NMDA) receptors, and binding to structurally specific site on the GABAA receptor leads to inhibition of GABA dependent Cl-pass. The aim of our research was to test the anxiolytic and antidepressant effects of zinc after single application and its influence on general behavioural parameters after repeated administration. Methods. Male Wistar rats were treated with increasing doses of zinc histidine dehydrate (10, 20, 30 mg/kg, i.p.). To determine anxiolytic and antidepressant properties of zinc two models were used: elevated plus maze (EPM) and forced swim test (FST). Behavioural parameters (stillness and mobility) were, also, recorded after single and repeated administration of active substance. Results. Testing animals in the EPM showed a statistically significant difference as follows: dose of 20 mg/kg significantly increased the time animals spent in open arms, indicating an acute anxiolytic effect, while doses of 30 mg/kg significantly reduced the time in the open arms, indicating a potentially anxiogenic effect. Testing the animals by FST showed a statistically significant difference in immobility time of animals treated with the lowest applied (10 mg/kg) and highest applied (30 mg/kg) doses of zinc, compared to the control group. The first day of testing behavioral parameters showed the tendency to increase locomotor activity of the animals with the lowest dose of zinc (10 mg/kg), while the following day revealed a reduced activity with the highest dose applied (30 mg/kg). Conclusion. Zinc has important effects on the CNS: After single application, in all doses zinc showed antidepressant effects. The effects of zinc on anxiety and locomotor activity showed dose-dependent bidirectional effects.

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Potarzycki, J., e W. Grzebisz. "Effect of zinc foliar application on grain yield of maize and its yielding compone". Plant, Soil and Environment 55, No. 12 (28 de dezembro de 2009): 519–27. http://dx.doi.org/10.17221/95/2009-pse.

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Actual yields of maize harvested by farmers are at level much below attainable yield potential of currently cultivated varieties. Among many growth factors zinc was recognized as one of main limiting factors of maize crop growth and yielding. This hypothesis has been verified within a three-year field study, where zinc fertilizer was applied to maize plants at the 5th leaf stage. Maize crop responded significantly to zinc foliar application in two of three years of study. The optimal rate of zinc foliar spray for achieving significant grain yield response was in the range from 1.0 to 1.5 kg Zn/ha. Grain yield increase was circa 18% (mean of three years) as compared to the treatment fertilized only with NPK. Plants fertilized with 1.0 kg Zn/ha significantly increased both total N uptake and grain yield. Yield forming effect of zinc fertilizer revealed via improvement of yield structure elements. The number of kernels per plant showed the highest response (+17.8% as compared to the NPK plot) and simultaneously the highest dependence on N uptake (R2 = 0.79). For this particular zinc treatment, however, the length of cob can also be applied as a component of yield structure significantly shaping the final grain yield.

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Benrashid, R., G. L. Nelson e Donald J. Ferm. "Effect of Zinc and Zinc Borate on Fire Properties of Modified Polyphenylene Oxide". Journal of Fire Sciences 11, n.º 3 (maio de 1993): 210–31. http://dx.doi.org/10.1177/073490419301100302.

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Modified polyphenylene oxide resin (m-PPO) (virgin) and m-PPO flame retarded with triaryl phosphate (FR m-PPO) were blended with zinc borate, zinc, and zinc/zinc borate. Both virgin and FR m-PPO containing zinc borate showed a marked reduction in smoke production (flaming and non- flaming-NBS Smoke Chamber). In FR m-PPO a reduction in oxygen index values was seen for zinc borate, except at the highest level tested (50 PHR). Zinc, on the other hand, showed an increase in oxygen index for FR m-PPO. Given the potential for both condensed and vapor phase activity for triaryl phosphate in m-PPO, the reduction in both smoke and oxygen index by zinc borate suggests a deactivation of the vapor phase activity of triaryl phosphate.

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Tüzün, Ahmet Engin, Osman Olgun e Alp Önder Yildiz. "The Effect of High-Level Dietary Supplementation with Different Zinc Sources on Performance, Eggshell Quality and Bone Characteristics in Layer Quails". “Agriculture for Life, Life for Agriculture” Conference Proceedings 1, n.º 1 (1 de julho de 2018): 176–82. http://dx.doi.org/10.2478/alife-2018-0026.

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Abstract The aim of this study was to investigate the effects of dietary supplementation with high levels of inorganic, organic or nano sources of two high-level zinc diets (200 and 300 mg/kg) on performance, eggshell quality and mineral content of bone in layer quails. The experiment had a 2×3 factorial arrangement of treatments. Egg production and the zinc content of tibia were significantly increased in the present experiment. Compared with zinc oxide supplementation, zinc-glycine supplementation increased zinc concentration in the tibia. The interactions between the sources and levels of zinc were a significant effect on egg production, eggshell breaking strength, eggshell weight and tibia zinc level. The highest eggshell breaking strength and eggshell weight were observed in the group was fed with diet including zinc-glycine at 300 mg/kg. These results suggested that zinc-glycine supplementation positively effects eggshell quality parameters and tibia zinc concentration when compared with other sources used in this experiment. Additionally, the supplementation layer quail diets with zinc-glycine rather than nanoparticulate sources of zinc could be recommended for optimum performance.

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Mclaren, R. G., R. D. McLenaghen e R. S. Swift. "Zinc applications to pastures: Effect on herbage and soil zinc concentrations". New Zealand Journal of Agricultural Research 34, n.º 1 (janeiro de 1991): 113–18. http://dx.doi.org/10.1080/00288233.1991.10417800.

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Holt, K., B. Young, L. Ott, F. Williams, R. Phillips, R. Rapp Phar, R. Dempsey, P. Tibbs e C. J. McClain. "THE EFFECT OF ZINC SUPPLEMENTATION ON ZINC STATUS AFTER HEAD INJURY". American Journal of Physical Medicine & Rehabilitation 68, n.º 4 (agosto de 1989): 207. http://dx.doi.org/10.1097/00002060-198908000-00020.

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Mocchegiani, Eugenio, Laura Costarelli, Robertina Giacconi, Francesco Piacenza, Andrea Basso e Marco Malavolta. "Zinc, metallothioneins and immunosenescence: effect of zinc supply as nutrigenomic approach". Biogerontology 12, n.º 5 (19 de abril de 2011): 455–65. http://dx.doi.org/10.1007/s10522-011-9337-4.

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Jagtap, R. N., P. P. Patil e S. Z. Hassan. "Effect of zinc oxide in combating corrosion in zinc-rich primer". Progress in Organic Coatings 63, n.º 4 (novembro de 2008): 389–94. http://dx.doi.org/10.1016/j.porgcoat.2008.06.012.

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Afifi, S. E., A. R. Ebaid, M. M. Hegazy e A. K. Barakat. "The effect of additives on zinc deposited from zinc sulfate solutions". JOM 44, n.º 1 (janeiro de 1992): 32–34. http://dx.doi.org/10.1007/bf03222748.

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Munnaluri, Mohan Rao, Sravan Chittla e Nihal Perumalla. "Serum Zinc Levels and the Effect of Oral Zinc in Acne Vulgaris". Journal of Evidence Based Medicine and Healthcare 7, n.º 47 (23 de novembro de 2020): 2777–82. http://dx.doi.org/10.18410/jebmh/2020/570.

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BACKGROUND Acne vulgaris is a chronic inflammatory condition of the pilosebaceous unit which occurs in adolescent age groups. Physical and psychological scars can create social issues in the family, school and workplace. The disorder is multifactorial. There are plenty of recovery choices but are not satisfactory. We wanted to investigate the serum zinc levels and the therapeutic utility of oral zinc supplementation in acne vulgaris patients. METHODS This is a prospective study conducted over a period of one and a half years among one hundred acne patients who reported to the outpatient clinic of the Department of Dermatology, Venereology and Leprology with untreated patients of acne vulgaris. RESULTS Males were 65 % and females were 35 % with male : female ratio of 6.5 : 3.5. Most of the patients were students occupying 71 % of the study. Family history was observed in 46 % of patients, either in the siblings or in the parents. Premenstrual flare-up of acne lesions was noted in 71.42 % of female patients indicating a pivotal role of hormones in the pathogenesis of acne. Aggravation of lesions in summer was noted in 45 % of patients. Aggravation of acne lesions with different types of diet like non-vegetarian food, oily food and chocolates was noticed in 69 % of the study. History of usage of different types of cosmetics available in the market was noted in 76 % of the patients. In the present study, 62 % had lower than normal serum zinc levels and 38 % had normal serum zinc levels. Thus, serum zinc levels were found to be lower in both male and female acne patients in the majority (62 %) of the study patients and also normal healthy controls. The fasting serum zinc levels in the 62 patients before and after oral zinc sulphate were estimated after completion of 3 months treatment. Normal serum zinc levels were observed in all 62 patients treated. CONCLUSIONS Oral zinc sulphate is an effective, safe and economic remedy in the treatment of acne vulgaris. The extra advantage with oral zinc sulphate is that it is devoid of many adverse reactions commonly seen after prolonged use of systemic antibiotics. KEYWORDS Oral Zinc Sulphate, Acne Vulgaris

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Naumenko, K. S., A. I. Ievtushenko, V. A. Karpyna, O. I. Bykov e L. A. Myroniuk. "The Effect of Ag-Doping on the Cytotoxicity of ZnO Nanostructures Grown on Ag/Si Substrates by APMOCVD". Mikrobiolohichnyi Zhurnal 84, n.º 2 (28 de novembro de 2022): 47–56. http://dx.doi.org/10.15407/microbiolj84.02.047.

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The search and development of new nanostructures and nanomaterials are very important for the progress of nanotechnology and modern microbiology. Due to the unique properties of silver and zinc oxide, these nanoparticles are the optimal basis for creating nanostructures with potential antiviral activity. An important issue in these studies is the establishment of cytotoxicity of these nanoparticles and their composites. Aim. To define the influence of substrate temperature and Ag concentration in ZnO lattice on the microstructure and cytotoxicity of zinc oxide nanostructures. Methods. Pure and Ag-doped ZnO nanostructures were grown on Ag/Si substrates by atmospheric pressure metalorganic chemical vapor deposition method using a mixture of zinc acetylacetonate and silver acetylacetonate powders as a precursor. Argentum thin films were deposited on Si substrates by a thermal evaporation method. MTT-assay was used for the analysis of MDBK and MDCK cell viability in the definition of zinc oxide nanostructure cytotoxicity. Results. Ag-doped zinc oxide nanostructures were grown and characterized by X-ray diff raction, scanning electron microscopy, and energy dispersive X-ray spectroscopy. It was found that Si substrate and pure zinc oxide do not inhibit the cell viability of both epithelial cultures whereas Ag-doped ZnO nanostructures inhibit the cell viability because of all-time exposure in a sample without dilution. The cytotoxic effect was not observed at higher dilutions for Ag-doped zinc oxide nanostructures. Conclusions. The investigation of the effect of Ag-doping on the morphology and cytotoxicity of zinc oxide nanostructures is very important for implementing zinc oxide nanostructures into the current optoelectronics and photocatalysis.

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Hung, Yuan-Tai, Qiong Hu, Richard J. Faris, Juanjuan Guo, Pedro E. Urriola, Gerald C. Shurson, Chi Chen e Milena Saqui-Salces. "Analysis of Gastrointestinal Responses Revealed Both Shared and Specific Targets of Zinc Oxide and Carbadox in Weaned Pigs". Antibiotics 9, n.º 8 (30 de julho de 2020): 463. http://dx.doi.org/10.3390/antibiotics9080463.

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Antibiotics and pharmacological zinc supplementation were commonly used as growth promoters for several decades in the swine industry before being limited because of public health and environmental concerns. Further, the physiological and metabolic responses associated with their growth promotion effects are unclear. To characterize these responses induced by pharmacological zinc supplementation (2500 mg/kg) and carbadox (55 mg/kg), 192 post-weaning pigs were fed basal and test diets for 43 days. Compared with basal, pharmacological zinc and carbadox independently improved growth performance. Pharmacological zinc increased gastric mucosa thickness compared with basal zinc, while carbadox increased intestinal villus:crypt ratio compared with non-carbadox. Pharmacological zinc and carbadox independently reduced interleukin (IL)-1β concentration compared with basal zinc and non-carbadox. Pharmacological zinc increased IL-1RA:IL-1 ratio by 42% compared with basal zinc, while carbadox tended to increase the IL-10 and IL10:IL-12 ratio compared with non-carbadox. Carbadox increased fecal concentrations of histidine and lysine compared with non-carbadox. The independent effect of pharmacological zinc and carbadox on morphology and nutrient metabolism, and their shared effect on immunity may contribute to the additive effect on growth promotion. These results further confirmed the concept that growth promotion is multifactorial intervention. Therefore, elucidating growth-promoting effects and searching for alternatives should include wide-spectrum evaluation.

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Šiler, Pavel, Iva Kolářová, Jiří Másilko, Radoslav Novotný e Tomáš Opravil. "The Effect of Zinc on the Portland Cement Hydration". Key Engineering Materials 761 (janeiro de 2018): 131–34. http://dx.doi.org/10.4028/www.scientific.net/kem.761.131.

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Concrete is still the most commonly used building material. The main component of concrete is Portland cement. Due to increasing use of secondary products containing zinc, the amount of zinc in the clinker or in the secondary raw materials is increasing in recent years. Portland clinker can gain zinc from solid waste or tires which are widely used as a fuel for a burning in rotary kiln. In the case of secondary raw materials, zinc may be present in the primary material, where the manufacturing process leads to its removal and concentrating to "waste" which is used in the cement industry. The biggest problem with cement doped with zinc is the retardation of hydration and decreasing of mechanical properties. The main aim of this work is describing and evaluation of zinc effect on the course of Portland cement hydration.

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Glover, Chris N., e Christer Hogstrand. "Amino acid modulation of in vivo intestinal zinc absorption in freshwater rainbow trout". Journal of Experimental Biology 205, n.º 1 (1 de janeiro de 2002): 151–58. http://dx.doi.org/10.1242/jeb.205.1.151.

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SUMMARY The composition of the intestinal lumen is likely to have considerable influence upon the absorption, and consequently the nutrition and/or toxicity, of ingested zinc in aquatic environments, where zinc is both a nutrient and a toxicant of importance. The effects of amino acids upon intestinal zinc uptake in freshwater rainbow trout (Oncorhynchus mykiss) were studied using an in vivo perfusion technique. The presence of histidine, cysteine and taurine had distinct modifying actions upon quantitative and qualitative zinc absorption, compared to perfusion of zinc alone. Alterations in zinc transport were not correlated with changes in levels of free zinc ion. The chemical nature of the zinc–amino acid chelate, rather than the chelation itself, appeared to have the most important influence upon zinc absorption. l-histidine, despite a strong zinc-chelating effect, maintained quantitative zinc uptake at control (zinc alone) levels. This effect correlated with the formation of Zn(His)2 species. d-histidine at a luminal concentration of 100 mmol l–1 significantly enhanced subepithelial zinc accumulation, but reduced the fraction of zinc that was retained and absorbed by the fish. The possibility of a Zn(His)2-mediated pathway for intestinal uptake is discussed. l-cysteine specifically stimulated the accumulation of zinc post-intestinally, an effect attributed to enhanced zinc accumulation in the blood. Taurine increased subepithelial zinc accumulation, but decreased the passage of zinc to post-intestinal compartments. Amino acids are proposed to have important roles in modifying intestinal zinc uptake with potential implications for environmental toxicity as well as aquaculture.

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Siregar, Rustam, Lilisianawati Lilisianawati, Endang Dewi Lestari e Harsono Salimo. "Effect of zinc supplementation on morbidity among stunted children in Indonesia". Paediatrica Indonesiana 51, n.º 3 (30 de junho de 2011): 128. http://dx.doi.org/10.14238/pi51.3.2011.128-32.

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Background The Indonesian Health Ministry reported that 35 .6% of Indonesian children and up to 50% in certain regions have stunted growth. They are at high risk of chronic zinc deficiency. Inadequate zinc intake may result in an impaired immune sy stem and high incidence of morbidity. Zinc supplementation is knO\Vll to improve immune status thus reducing the incidence of morbidity among stunted children.Objective To evaluate the effects of zinc supplementation on morbidity incidence among stunted Indonesian school children. Methods We evaluated the effects of daily zinc supplementation (2.38 mg of zinc􀁇supplemented milk) on the incidence of diarrhea, respiratory infections, and fever in a double􀁇blind, randomized, controlled trial in 169 stunted children (zinc􀁇supplemented n=84; placebo n=85) aged 7 to 9 years in Jakarta and Solo. Zincsupplementation and morbidity surveillance were perfonned for 6 months.Results Compared to the first 3 months of intervention, zinc supplementation resulted in a reduction in the incidence of diarrhea, respiratory infections, and fever during the second three months (by 67%, 42%, and 30%, respectively). Children from the zinc􀁇supplemented group tended to have a lower episodic incidence of diarrhea and fever than those from the placebo group, although neither of these differences was statistically significant (P< 0.45,95% CI 0.63 to 0.89).Conclusion Zinc supplementation has no significant effect in reducing the incidence of diarrhea, respiratory infections, and fever in stunted children although tended to have a lower episodic incidence.

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Patel, Satyanarayan, e Manish Kumar. "Elastocaloric effect in zinc oxide nanowire". Functional Materials Letters 14, n.º 05 (25 de maio de 2021): 2150021. http://dx.doi.org/10.1142/s1793604721500211.

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In this work, zinc oxide (ZnO) nanowire is proposed for elastocaloric application which has been overlooked until now. The elastocaloric effect ([Formula: see text]CE) is calculated by Maxwell relation. The large elastocaloric temperature and entropy change evaluated as 17 K and 28 J/kgK, respectively, at 300 K correspond to the stress of 12 GPa or strain of 5.5% by the simulation data. The elastocaloric temperature can be increased to 22 K under the operating tempering of 600 K. However, [Formula: see text]CE estimated from the experimental data is found as 2.6 K at 300 K, which corresponds to stress of 6 GPa. These results are expected to significantly expand the knowledge of ZnO nanomaterials as a potential candidate for [Formula: see text]CE. The results are based on the indirect approximation; hence, a direct measurement is needed to verify the obtained results.

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Musalia, L. M., e P. Aggett. "Effect of Helminthiasis on Zinc Metabolism". Asian-Australasian Journal of Animal Sciences 14, n.º 2 (1 de fevereiro de 2001): 276–79. http://dx.doi.org/10.5713/ajas.2001.276.

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Espanani, H. R., Z. Faghfoori, M. Izadpanah e V. Yousefi Babadi. "Toxic effect of nano-zinc oxide". Bratislava Medical Journal 116, n.º 10 (2015): 616–20. http://dx.doi.org/10.4149/bll_2015_119.

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Dahiya, A. S., C. Opoku, C. Oshman, G. Poulin-Vittrant, F. Cayrel, L. P. Tran Huu Hue, D. Alquier e N. Camara. "Zinc oxide sheet field-effect transistors". Applied Physics Letters 107, n.º 3 (20 de julho de 2015): 033105. http://dx.doi.org/10.1063/1.4927270.

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Wapnir, Raul A., Lily Stiel e Shih-Yu Lee. "Zinc intestinal absorption: Effect of carbohydrates". Nutrition Research 9, n.º 11 (novembro de 1989): 1277–84. http://dx.doi.org/10.1016/s0271-5317(89)80150-2.

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Baxter, I. A., e P. A. Lambert. "The effect of zinc on imipenem". Journal of Antimicrobial Chemotherapy 39, n.º 6 (1 de junho de 1997): 838–39. http://dx.doi.org/10.1093/jac/39.6.838.

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