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1不同剂量枸橼酸咖啡因和氨茶碱治疗早产儿呼吸暂停的研究显示文摘目的分析不同剂量枸橼酸咖啡因和氨茶碱治疗早产儿呼吸暂停的疗效及安全性。方法选择2013年10月至2015年10月本院新生儿重症监护病房(NICU)收治的呼吸暂停早产儿,随机分为大剂量咖啡因组:负荷量40 mg/(kg·d),维持量20 mg/(kg·d),Qd;小剂量咖啡因组:负荷量20 mg/(kg·d),维持量10 mg/(kg·d),Qd;氨茶碱组:负荷量5 mg/kg,维持量2 mg/kg,Q 12 h(持续给药至呼吸暂停停止7天或纠正胎龄34周)。观察患儿拔管失败率、呼吸暂停发生率、呼吸暂停持续时间、机械通气时间、氧疗时间、住院时间、治疗过程中的不良反应、并发症发生率及死亡率。结果大剂量咖啡因组拔管失败率、呼吸暂停发生率、呼吸暂停持续时间、氧疗时间等均低于小剂量咖啡因组和氨茶碱组,心动过速发生率高于小剂量咖啡因组和氨茶碱组,差异均有统计学意义(P<0.05)。小剂量咖啡因组与氨茶碱组各项指标比较,差异无统计学意义(P>0.05)。各组机械通气时间、持续气道正压通气(CPAP)时间、住院时间及并发症发生率、死亡率等差异无统计学意义(P>0.05)。结论大剂量咖啡因可降低拔管失败率和呼吸暂停发生率,减少呼吸暂停持续时间和氧疗持续时间,除心动过速外,未增加其他不良反应。Sanjay Kumar chaudhari 陈厚炎 谭举方 朱晓芳 2016中国新生儿科杂志2016,31,5:31
2Hepatitis B virus,HBx mutants and their role in hepatocellular carcinoma显示文摘Hepatocellular carcinoma(HCC)is one of the leading causes of death induced by cancer in the modern world and majority of the cases are related to chronic hepatitis B virus(HBV)infection.HBV-encoded X protein(HBx)is known to play a pivotal role in the pathogenesis of viral induced HCC.HBx is a multifunctional protein of17 kDa which modulates several cellular processes by direct or indirect interaction with a repertoire of host factors resulting in HCC.HBX might interfere with several cellular processes such as oxidative stress,DNA repair,signal transduction,transcription,protein degradation,cell cycle progression and apoptosis.A number of reports have indicated that HBx is one of the most common viral ORFs that is often integrated into the host genome and its sequence variants play a crucial role in HCC.By mutational or deletion analysis it was shown that carboxy terminal of HBx has a likely role in protein-protein interactions,transcriptional transactivation,DNA repair,cell,signaling and pathogenesis of HCC.The accumulated evidence thus far suggests that it is difficult to understand the mechanistic nature of HBx associated HCC,and HBx mediated transcriptional transactivation and signaling pathways may be a major determinant.This article addresses the role of HBx in the development of HCC with particular emphasis on HBx mutants and their putative targets.Ashraf Ali Hany Abdel-Hafiz Mohd Suhail Amany Al-Mars Mohammad Khalid Zakaria Kaneez Fatima Sultan Ahmad Esam Azhar Adeel Chaudhary Ishtiaq Qadri 2014World Journal of Gastroenterology2014,20,30:29
3PCSK9 inhibitors: A new era of lipid lowering therapy显示文摘Hyperlipidemia is a well-established risk factor for developing cardiovascular disease(CVD). The recent American College of Cardiology and American Heart Association guidelines on lipid management emphasize treatment of individuals at increased risk for developing CVD events with 3-hydroxy-3-methylglutaryl coenzyme A reductase inhibitors(statins) at doses proven to reduce CVD events. However, there are limited options for patients who are either intolerant to statin therapy, develop CVD despite being on maximally tolerated statin therapy, or have severe hypercholesterolemia. Recently the Food and Drug Administration approved two novel medications for low-density lipoprotein(LDL)-cholesterol reduction: Evolocumab and Alirocumab. These agents target and inactivate proprotein convertase subtilsinkexin type 9(PCSK9), a hepatic protease that attaches and internalizes LDL receptors into lysosomes hence promoting their destruction. By preventing LDL receptor destruction, LDL-C levels can be lowered 50%-60% above that achieved by statin therapy alone. This review explores PCSK-9 biology and the mechanisms available to alter it; clinical trials targeting PCSK9 activity, and the current state of clinically available inhibitors of PCSK9.Rahul Chaudhary Jalaj Garg Neeraj Shah Andrew Sumner 2017World Journal of Cardiology2017,9,2:23
4同时性结直肠癌肝转移同期与分期手术疗效的Meta分析显示文摘目的对比分析同时性结直肠癌肝转移行同期手术与分期手术切除转移灶的疗效。方法通过计算机文献检索ISI Web of Knowledge、Pubmed及中国期刊网,检索国内外自1990年1月至2010年12月间公开发表的有关结直肠癌肝转移治疗的文章。通过Meta分析对比同时性结直肠癌肝转移同期、分期术后围手术期并发症、死亡率、5年生存率。结果同时性结直肠癌肝转移同期手术切除组与分期手术切除组比较,同期手术组围手术期并发症发生率36.4%与分期手术组35.6%(P=0.957)相似,在围手术期死亡率(OR=1.91,95%CI:0.90~4.08,P=0.09)及5年生存率(OR=1.08,CI:0.73~1.61,P=0.69)方面无统计学差异。结论与分期切除相比,同时性结直肠癌肝转移行同期切除同样安全、有效。李宇杰 车向明 甘建新 CHAUDHARY Prakash 廖新华 张丹杰 毕铁强 2012西安交通大学学报(医学版)2012,33,3:20
5Bilirubin in coronary artery disease:Cytotoxic or protective?显示文摘Bilirubin has traditionally been considered a cytotoxic waste product.However,recent studies have shown bilirubin to have anti-oxidant,anti-inflammatory,vasodilatory,anti-apoptotic and anti-proliferative functions.These properties potentially confer bilirubin a new role of protection especially in coronary artery disease(CAD),which is a low grade inflammatory process exacerbated by oxidative stress.In fact,recent literature reports an inverse relationship between serum concentration of bilirubin and the presence of CAD.In this article,we review the current literature exploring the association between levels of bilirubin and risk of CAD.We conclude that current evidence is inconclusive regarding the protective effect of bilirubin on CAD.A causal relationship between low serum bilirubin level and increased risk of CAD is not currently established.Nancy Gupta Tavankit Singh Rahul Chaudhary Sushil K Garg Gurprataap Singh Sandhu Varun Mittal Rahul Gupta Roxana Bodin Sachin Sule 2016World Journal of Gastrointestinal Pharmacology and Therapeutics2016,7,4:14
6Potential mechanisms of hepatitis B virus induced liver injury显示文摘Chronic active hepatitis(CAH) is acknowledged as an imperative risk factor for the development of liver injury and hepatocellular carcinoma.The histological end points of CAH are chronic inflammation,fibrosis and cirrhosis which are coupled with increased DNA synthesis in cirrhotic vs healthy normal livers.The potential mechanism involved in CAH includes a combination of processes leading to liver cell necrosis,inflammation and cytokine production and liver scaring(fibrosis).The severity of liver damage is regulated by Hepatitis B virus genotypes and viral components.The viral and cellular factors that contribute to liver injury are discussed in this article.Liver injury caused by the viral infection affects many cellular processes such as cell signaling,apoptosis,transcription,DNA repair which in turn induce radical effects on cell survival,growth,transformation and maintenance.The consequence of such perturbations is resulted in the alteration of bile secretion,gluconeogenesis,glycolysis,detoxification and metabolism of carbohydrates,proteins,fat and balance of nutrients.The identification and elucidation of the molecular pathways perturbed by the viral proteins are important in order to design effective strategy to minimize and/or restore the hepatocytes injury.Mohd Suhail Hany Abdel-Hafiz Ashraf Ali Kaneez Fatima Ghazi A Damanhouri Esam Azhar Adeel GA Chaudhary Ishtiaq Qadri 2014World Journal of Gastroenterology2014,20,35:12
7Bright-field holography:cross-modality deep learning enables snapshot 3D imaging with bright-field contrast using a single hologram显示文摘Digital holographic microscopy enables the 3D reconstruction of volumetric samples from a single-snapshot hologram.However,unlike a conventional bright-field microscopy image,the quality of holographic reconstructions is compromised by interference fringes as a result of twin images and out-of-plane objects.Here,we demonstrate that cross-modality deep learning using a generative adversarial network(GAN)can endow holographic images of a sample volume with bright-field microscopy contrast,combining the volumetric imaging capability of holography with the speckle-and artifact-free image contrast of incoherent bright-field microscopy.We illustrate the performance of this“bright-field holography”method through the snapshot imaging of bioaerosols distributed in 3D,matching the artifact-free image contrast and axial sectioning performance of a high-NA bright-field microscope.This data-driven deep-learning-based imaging method bridges the contrast gap between coherent and incoherent imaging,and enables the snapshot 3D imaging of objects with bright-field contrast from a single hologram,benefiting from the wave-propagation framework of holography.Yichen Wu Yilin Luo Gunvant Chaudhari Yair Rivenson Ayfer Calis Kevin de Haan Aydogan Ozcan 2019Light(Science & Applications)2019,8,1:12
8Euglycemic diabetic ketoacidosis:A missed diagnosis显示文摘Euglycemic diabetic ketoacidosis(DKA)is an acute life-threatening metabolic emergency characterized by ketoacidosis and relatively lower blood glucose(less than 11 mmol/L).The absence of hyperglycemia is a conundrum for physicians in the emergency department and intensive care units;it may delay diagnosis and treatment causing worse outcomes.Euglycemic DKA is an uncommon diagnosis but can occur in patients with type 1 or type 2 diabetes mellitus.With the addition of sodium/glucose cotransporter-2 inhibitors in diabetes mellitus management,euglycemic DKA incidence has increased.The other causes of euglycemic DKA include pregnancy,fasting,bariatric surgery,gastroparesis,insulin pump failure,cocaine intoxication,chronic liver disease and glycogen storage disease.The pathophysiology of euglycemic DKA involves a relative or absolute carbohydrate deficit,milder degree of insulin deficiency or resistance and increased glucagon/insulin ratio.Euglycemic DKA is a diagnosis of exclusion and should be considered in the differential diagnosis of a sick patient with a history of diabetes mellitus despite lower blood glucose or absent urine ketones.The diagnostic workup includes arterial blood gas for metabolic acidosis,serum ketones and exclusion of other causes of high anion gap metabolic acidosis.Euglycemic DKA treatment is on the same principles as for DKA with correction of dehydration,electrolytes deficit and insulin replacement.The dextrosecontaining fluids should accompany intravenous insulin to correct metabolic acidosis,ketonemia and to avoid hypoglycemia.Prashant Nasa Sandeep Chaudhary Pavan Kumar Shrivastava Aanchal Singh 2021World Journal of Diabetes2021,12,5:11
9The relevance of serum albumin among elderly patients with acute decompensated heart failure显示文摘Objective To assess the prognostic utility of serum albumin among elderly patients admitted for acute decompensated heart failure(ADHF)in terms of all-cause mortality and also to identify the predictors of hypoalbuminemia.Methods Retrospective cohort study of 119 elderly patients admitted for ADHF.Elderly patients were defined as patients over the age of 65 years.The patients were followed up for approximately 11 years.Patients with advanced renal failure,liver disease not due to HF,cancer and other causes of low life expectancy were excluded.Hypoalbuminemia was defined as serum albumin≤2.9 g/dL.Results The study was made up of 65 females and 54 males with age ranging from 65 to 96 years.Of the 119 elderly patients with ADHF,there were 26 deaths.A significantly higher proportion of patients in the mortality group had an admission serum albumin level of≤2.9 g/dL than those surviving(P=0.011).After Cox’s logistic regression,low albumin(P=0.016),elevated direct bilirubin(P=0.03),age greater than 85(P=0.008),lack of use of beta blockers(P=0.0001)and left ventricular ejection fraction less than 35%(P=0.005)increased the risk of death.Elevated serum creatinine(P=0.0357)was the only predictor of hypoalbuminemia following multiple linear regression.Conclusions Hypoalbuminemia may be an unrecognized marker of death in elderly patients with ADHF.Tuoyo O Mene-Afejuku Ela-Anamaria Moisa Adedoyin Akinlonu Carissa Dumancas Shushan Veranyan Jose A Perez Peggy Salazar Shobhana Chaudhari Gerald Pekler Savi Mushiyev Ferdinand Visco 2019Journal of Geriatric Cardiology2019,16,7:10
10先锋牧草-香根草联合固氮菌多样性显示文摘【目的】香根草(Vetiver zizanioides)是一种多年生禾本科草本植物,具有极强的生态适应性和抗逆能力,可作饲料和水土保持用。通过研究香根草联合固氮菌多样性,为进一步研究和应用打下基础。【方法】采用无氮培养基,首次从香根草中分离到47株联合固氮菌,分别应用SDS-PAGE全细胞蛋白质电泳、DNA指纹图谱、唯一碳源和16SrDNA全序列测定等方法,进行聚类和多样性分析。【结果】SDS-PAGE、IS-PCR和Bio-BIQA碳源利用的聚类结果基本一致,将供试菌株分为6个类群和4个单菌株;16SrDNA序列测定表明,从香根草中分离的菌株包括了佛莱辛草螺菌(Herbaspirillum frisingense)、中型假食酸菌(Pseudacidovorax intermedius)、恶臭假单胞菌(Pseudomonas putida)、荧光假单胞菌(Pseudomonas fluorescens)、越南伯克氏菌(Burkholderia vietnamiensis)、阴沟肠杆菌(Enterobacter cloacae)、路德维希肠杆菌(Enterobacter ludwigii)和松江壳聚糖降解菌(Mitsuaria chitosanitabida)等不同菌种。【结论】香根草联合固氮菌具有较大的资源多样性,对固氮菌资源的扩展和将来牧草上的应用具有重要意义。赵现伟 Chaudhary Hassan Javed 何玉梅 张志英 彭桂香 谭志远 2009微生物学报2009,49,11:9
11Buttress plating for a rare case of comminuted medial condylar Hoffa fracture associated with patellar fracture显示文摘Hoffa 骨折是不平常的 injury.In 文学,侧面的 condylar Hoffa 骨折比中间的 condylar Hoffa 骨折作为一个更普通的损害模式被提及。损害的机制和处理的方法很好没在文学被描述。我们与 ipsilateral 正在介绍弄碎的中间的 condylar Hoffa 骨折的一个稀罕盒子膝盖骨的骨折。损害的机制没在文学被描述。落后螺丝钉固定,是处理的最可接受的方法,不由于粉碎是可能的。我们解释损害的可能的机制并且与 L-but-tress 板修理破裂。Ashwani Soni Ramesh K Sen Uttam Chand Saini Dajjit Singh Sushil Chaudhary 2012Chinese Journal of Traumatology2012,15,4:9
12An improved random forest classifier for multi-class classification显示文摘The paper presents an improved-RFC(Random Forest Classifier)approach for multi-class disease classification problem.It consists of a combination of Random Forest machine learning algorithm,an attribute evaluator method and an instance filter method.It intends to improve the performance of Random Forest algorithm.The performance results confirm that the proposed improved-RFC approach performs better than Random Forest algorithm with increase in disease classification accuracy up to 97.80%for multi-class groundnut disease dataset.The performance of improved-RFC approach is tested for its efficiency on five benchmark datasets.It shows superior performance on all these datasets.Archana Chaudhary Savita Kolhe Raj Kamal 2016Information Processing in Agriculture2016,3,4:8
13A review of global initiatives to fight antibiotic resistance and recent antibiotics' discovery显示文摘Data from across the world have shown an overall decline in the antibiotic pipeline and continually rising resistance to all first-line and last-resort antibiotics. The gaps in our knowledge of existing prevalence and mechanisms of antibiotic resistance(ABR) are all too well known. Several decades of antibiotic abuse in humans, animals, and agricultural practices have created health emergency situations and huge socio-economic impact. This paper discusses key findings of the studies conducted by several national and international collaborative organizations on the current state of affairs in ABR.Alongside, a brief overview of the antibacterial agents' discovery in recent years approved by the US FDA is discussed.Arpana Sagwal Chaudhary 2016Acta Pharmaceutica Sinica B2016,6,6:8
14Comparative study of outcomes following laparoscopic Roux-en-Y gastric bypass and sleeve gastrectomy in morbidly obese patients: A case control study显示文摘AIM To compare the impact of laparoscopic Roux-en-Y gastric bypass(LRYGB) and laparoscopic sleeve gastrectomy(LSG) on weight loss and obesity related comorbidities over two year follow-up via case control study design.METHODS Forty patients undergoing LRYGB, who completed their two year follow-up were matched with 40 patients undergoing LSG for age, gender, body mass index and presence of type 2 diabetes mellitus(T2DM). Data of these patients was retrospectively reviewed to compare the outcome in terms of weight loss and improvement in comorbidities, i.e., T2 DM, hypertension(HTN), obstructive sleep apnea syndrome(OSAS), hypothyroidism and gastroesophageal reflux disease(GERD).RESULTS Percentage excess weight loss(EWL%) was similar in LRYGB and LSG groups at one year follow-up(70.5% vs 66.5%, P = 0.36) while it was significantly greater for LRYGB group after two years as compared to LSG group(76.5% vs 67.9%, P = 0.04). The complication rate after LRYGB and LSG was similar(10% vs 7.5%,P = 0.99). The median duration of T2 DM and mean number of oral hypoglycemic agents were higher in LRYGB group than LSG group(7 years vs 5 years and 2.2 vs 1.8 respectively, P < 0.05). Both LRYGB and LSG had significant but similar improvement in T2 DM, HTN, OSAS and hypothyroidism. However, GERD resolved in all patients undergoing LRYGB while it resolved in only 50% cases with LSG. Eight point three percent patients developed new-onset GERD after LSG.CONCLUSION LRYGB has better outcomes in terms of weight loss two years after surgery as compared to LSG. The impact of LRYGB and LSG on T2 DM, HTN, OSAS and hypothyroidism is similar. However, LRYGB has significant resolution of GERD as compared to LSG.Harshit Garg Pratyusha Priyadarshini Sandeep Aggarwal Samagra Agarwal Rachna Chaudhary 2017World Journal of Gastrointestinal Endoscopy2017,9,4:7
15Impact of some chlorinated pesticides on the haematology of the fish Cyprinus carpio and Puntius ticto显示文摘The effects of pesticides on blood characteristics and histological changes in erythrocytes of the fish species Cyprinus carpio and Puntius ticto were studied. The fishes were exposed to sub lethal concentrations of different chlorinated pesticides namely aldrin, dieldrin, DDT, BHC and chlordane for 10, 20 and 30 d in continuous flow-through test. The LC 50 values were calculated based on acute toxicity tests and the sublethal doses were arrived at for chronic bioassay studies. Results showed an increase in haemoglobin content of both Cyprinus carpio and Puntius ticto in case of aldrin and dieldrin. Haemoglobin content reduced from an initial 13 g/100 ml to 8.07 and 10.15 g/100 ml in case of Cyprinus at the end of ten days exposure to aldrin and dieldrin respectively, and gradually increased to 8.7 g/100 ml and 10.15 g/100 ml after 20 d of exposure. The haemoglobin content after 30 d exposure to aldrin and dieldrin was 10.15 g/100 ml and 11.6 g/100 ml respectively. In case of Puntius ticto, the haemoglobin content in control fishes recorded was 12.8 g/100 ml while in case of fish exposed to aldrin, the haemoglobin content reduced initially on ten days exposure to 10.15 g/100 ml and increased to 11.6 g/100 ml and 13.0 g/100 ml during twenty days and thirty days exposure respectively. This trend was also observed with dieldrin in both the fishes studied. Red blood cells were also counted in case of all the pesticides and exposure periods with respect to Cyprinus carpio and Puntius ticto. Irrespective of the species and pesticide, the RBC counts uniformly showed decreasing trend with the increase in exposure period, while packed cell volume, PCV(%) showed increasing trend with respect to increase in exposure period in case of aldrin and dieldrin in both the fishes. But DDT, BHC and chlordane showed decreasing trend in PCV(%) values with increasing periods of exposure.Shanta Satyanarayan Rajesh S. Bejankiwar P.R. Chaudhari J.P.Kotangale Ahana Satyanarayan 2004Journal of Environmental Sciences2004,16,4:7
16Lipid abnormalities in kidney disease and management strategies显示文摘Patients with kidney diseases continue to experience significant cardiovascular disease(CVD) morbidity and mortality. Although there are many important risk factors playing a role in the pathogenesis of CVD in chronic kidney disease(CKD) patients, dyslipidemia(elevated triglycerides, elevated oxidized low-densitylipoprotein and low/dysfunctional low high-density) represents one of the modifiable risk factors. Renal failure patients have unique lipid abnormalities which not only have complex role in pathogenesis of CVD but also cause relative resistance to usual interventions. Most of the randomized trials have been in hemodialysis population and data from CKD non-dialysis, peritoneal dialysis and renal transplant populations is extremely limited. Compared to general population, evidence of mortality benefit of lipid lowering medications in CKD population is scarce. Future research should be directed towards establishing long term benefits and side effects of lipid lowering medications, through randomized trials, in CKD population.Vishwam Pandya Akhilesh Rao Kunal Chaudhary 2015World Journal of Nephrology2015,4,1:7
17Changes in cultivated land patterns and driving forces in the Three Gorges Reservoir area, China, from 1992 to 2015显示文摘Changes of cultivated land patterns caused by major water conservation projects are rarely reported. We selected the Three Gorges Reservoir area in China to study the change in area and landscape pattern of the cultivated land in the head,central, and tail areas of the reservoir that took place between 1992 and 2015;we then studied the spatial distribution of the cultivated land in the three parts of the reservoir;finally, we studied the driving forces behind the changes in the cultivated land. The results derived are as follows.(1) During the construction of the Three Gorges Project(TGP, 1992–2015), the area of cultivated land around the reservoir decreased by30.23 million ha. This reduction occurred in phases:the most severe change in cultivated land occurred during the later stage of the project(2002–2010);only 0.62 million ha of cultivated land did not change between 1992 and 2015.(2) Spatial pattern analysis showed that the cultivated land in the three parts of the reservoir changed from a northern distribution to a southern distribution;thus, the area of cultivated land in the north decreased over the time period. The area of cultivated land in the head and tail areas decreased by varying degrees, while it increased in the central area over the 23 years, indicating that the change in cultivated land showed regional differences.(3) The TGP, the policy of reverting farmland to forest,and urbanization were the main driving factors for the change of cultivated land, but there were differences in their impacts at different stages.(4) According to the patch dynamics of the land cover change, the degree of change gradually intensified during the early and later stages of the project and then stabilized during the operational period. Our research provides scientific support for the protection of cultivated land resources and food security in the reservoir area and for the coordination of social and economic development, which is of great significance to sustainable development in the reservoir area.ZHANG Yu-xin WANG Yu-kuan FU Bin LI Ming LU Ya-feng DIXIT Amod Mani CHAUDHARY Suresh WANG Shan 2020Journal of Mountain Science2020,17,1:7
18Role of gut microbiota in cardiovascular diseases显示文摘The human gut is colonized by a community of microbiota,primarily bacteria,that exist in a symbiotic relationship with the host.Intestinal microbiota-host interactions play a critical role in the regulation of human physiology.Deleterious changes to the composition of gut microbiota,referred to as gut dysbiosis,has been linked to the development and progression of numerous diseases,including cardiovascular disease(CVD).Imbalances in host-microbial interaction impair homeostatic mechanisms that regulate health and can activate multiple pathways leading to CVD risk factor progression.Most CVD risk factors,including aging,obesity,dietary patterns,and a sedentary lifestyle,have been shown to induce gut dysbiosis.Dysbiosis is associated with intestinal inflammation and reduced integrity of the gut barrier,which in turn increases circulating levels of bacterial structural components and microbial metabolites,including trimethylamine-N-oxide and short-chain fatty acids,that may facilitate the development of CVD.This article reviews the normal function and composition of the gut microbiome,mechanisms leading to the leaky gut syndrome,its mechanistic link to CVD and potential novel therapeutic approaches aimed towards restoring gut microbiome and CVD prevention.As CVD is the leading cause of deaths globally,investigating the gut microbiota as a locus of intervention presents a novel and clinically relevant avenue for future research.Marko Novakovic Amit Rout Thomas Kingsley Robert Kirchoff Amteshwar Singh Vipin Verma Ravi Kant Rahul Chaudhary 2020World Journal of Cardiology2020,12,4:6
19A GFP-based bacterial biosensor with chromosomally integrated sensing cassette for quantitative detection of Hg(Ⅱ) in environment显示文摘A mercury biosensor was constructed by integrating biosensor genetic elements into E. coli JM109 chromosome in a single copy number, using the attP/attB recombination mechanism of λ phage. The genetic elements used include a regulatory protein gene (merR) along with operator/promoter (O/P) derived from the mercury resistance operon from pDU1358 plasmid of Serratia marcescens. The expression of reporter gene gfp is also controlled by merR/O/P. Integration of the construct into the chromosome was done to increase the stability and precision of the biosensor. This biosensor could detect Hg(Ⅱ) ions in the concentration range of 100–1700 nmol/L, and manifest the result as the expression of GFP. The GFP expression was significantly different (P 0.05) for each concentration of inducing Hg(Ⅱ) ions in the detection range, which reduces the chances of misinterpretation of results. A model using regression method was also derived for the quantification of the concentration of Hg(Ⅱ) in water samples.Himanshu Priyadarshi Absar Alam Gireesh-Babu P Rekha Das Pankaj Kishore Shivendra Kumar Aparna Chaudhari 2012Journal of Environmental Sciences2012,24,5:6
20Review of oxidative stress and antioxidative defense mechanisms in Gossypium hirsutum L.in response to extreme abiotic conditions显示文摘Oxidative stress occurs when crop plants are exposed to extreme abiotic conditions that lead to the excessive production and accumulation of reactive oxygen species(ROS).Those extreme abiotic conditions or stresses include drought,high temperature,heavy metals,salinity,and ultraviolet radiation,and they cause yield and quality losses in crops.ROS are highly reactive species found in nature that can attack plant organelles,metabolites,and molecules by interrupting various metabolic pathways until cell death occurs.Plants have evolved defense mechanisms for the production of antioxidants to detoxify the ROS and to protect the plant against oxidative damage.Modern researches in crop plants revealed that low levels of ROS act as a signal which induces tolerance to environmental extremes by altering the expression of defensive genes.In this review,we summarized the processes involved in ROS production in response to several types of abiotic stress in cotton plants.Furthermore,we discussed the achievements in the understanding and improving oxidative stress tolerance in cotton in recent years.Researches related to plant oxidative stresses have shown excellent potential for the development of stress-tolerant crops.QAMER Zainab CHAUDHARY Muhammad Tanees DU Xiongming HINZE Lori AZHAR Muhammad Tehsee 2021Journal of Cotton Research2021,4,2:4
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