川崎病患儿并发冠状动脉损伤的危险因素及风险预测指标模型的评价与构建

摘要 目的：分析川崎病（KD）患儿并发冠状动脉损伤（CALs）的危险因素,并评价风险预测指标构建的模型价值。方法：选取2019年1月～2022年5月我院收治的100例KD患儿,根据是否合并CALs分为CALs组33例和非CALs组67例。采用单因素和多因素Logistic回归分析KD患儿并发CALs的影响因素。以多因素Logistic回归所保留的变量构建KD患儿并发CALs的预测模型。采用受试者工作特征（ROC）曲线分析构建的预测模型对KD患儿并发CALs的预测价值。结果：CALs组发热持续时间≥10 d、丙种球蛋白（IVIG）治疗延迟、IVIG无反应比例、中性粒细胞计数、红细胞沉降率（ESR）、C反应蛋白（CRP）、降钙素原（PCT）、N端脑利钠肽前体（NT-proBNP）、肌酸激酶MB（CK-MB）水平高于非CALs组（均P＜0.05）。多因素Logistic回归分析分析显示,发热持续时间≥10 d、IVIG治疗延迟、IVIG无反应、ESR、CRP、PCT、NT-proBNP、CK-MB为KD患儿并发CALs的危险因素（均P＜0.05）。以上述指标所构建KD患儿并发CALs的联合预测模型评估效能较高,其ROC-AUC（0.95CI）为0.891（0.813～0.950）。结论：发热持续时间、IVIG治疗延迟、IVIG无反应和ESR、CRP、PCT、NT-proBNP、CK-MB升高是KD患儿并发CALs的危险因素,根据风险预测指标构建的预测模型对KD患儿并发CALs的预测能效较好。     

淀粉样蛋白A、D-二聚体、肌酸激酶同工酶联合检测对川崎病患儿冠状动脉损伤的诊断价值分析

摘要 目的：探讨血清淀粉样蛋白A(SAA)、D-二聚体(D-D)、肌酸激酶同工酶(CK-MB)联合检测对川崎病患儿冠状动脉损伤(CAL)的诊断价值。方法：选取2018年9月～2021年5月我院收治的80例川崎病患儿,根据是否合并CAL分为CAL组(n=34)和NCAL组(n=46)。收集患儿基础资料,并检测SAA、D-D、CK-MB水平。多因素Logistic回归分析川崎病患儿CAL影响因素,受试者工作特征（ROC）曲线分析血清SAA、D-D、CK-MB水平对川崎病患儿CAL的诊断价值。结果：与NCAL组比较,CAL组C反应蛋白(CRP)、红细胞沉降率(ESR)、SAA、D-D、CK-MB水平升高(P＜0.05)。多因素Logistic回归分析显示,CRP、ESR、SAA、D-D、CK-MB为川崎病患儿CAL独立影响因素(P＜0.05)。SAA、D-D、CK-MB、三项联合诊断川崎病患儿CAL的曲线下面积（AUC）分别为0.661、0.687、0.746、0.799,联合应用的诊断效能最高。结论：血清SAA、D-D、CK-MB是川崎病患儿CAL独立影响因素,且联合检测以上指标可辅助诊断川崎病患儿CAL。     

川崎病患儿并发冠状动脉损伤的危险因素及预测模型的构建与评价

摘要 目的：分析川崎病患儿并发冠状动脉损伤（CAL）的危险因素，并构建和评价川崎病患儿并发CAL的预测模型。方法：选取2019年1月～2022年5月我院收治的342例川崎病患儿，根据是否并发CAL分为CAL组和非CAL组。收集所有患儿临床资料，采用单因素和多因素Logistic回归分析川崎病患儿并发CAL的影响因素，并构建预测模型，H-L检验和受试者工作特征（ROC）曲线检验预测模型拟合优度和对川崎病患儿并发CAL的预测价值。结果：342例川崎病患儿CAL发生率为16.67％（57/342）。单因素分析显示，CAL组发热持续时间≥10 d、静脉注射免疫球蛋白（IVIG）治疗延迟、IVIG无反应比例和单核细胞比例（MO％）、嗜酸性粒细胞比例（EO％）、C反应蛋白（CRP）、红细胞沉降率（ESR）、降钙素原（PCT）、心肌肌钙蛋白I（cTnI）、肌酸激酶同工酶（CK-MB）水平高于非CAL组（P均＜0.05）。多因素Logistic回归分析显示，发热持续时间≥10 d、IVIG治疗延迟、IVIG无反应和MO％、CRP、ESR、PCT、cTnI升高为川崎病患儿并发CAL的独立危险因素（P均＜0.05）。H-L检验川崎病患儿并发CAL的预测模型拟合效果良好。ROC曲线分析显示，该模型预测川崎病患儿并发CAL的曲线下面积（AUC）为0.911（95％CI：0.876～0.939）。结论：发热持续时间≥10 d、IVIG治疗延迟、IVIG无反应和MO％、CRP、ESR、PCT、cTnI升高为川崎病患儿并发CAL的危险因素，根据危险因素构建的川崎病患儿并发CAL预测模型价值较高。     

SAA、NLR、CRP及PDW对新生儿坏死性小肠结肠炎手术时机的预测价值分析

摘要 目的：探讨血清淀粉样蛋白A（SAA）、C反应蛋白（CRP）、外周血血小板分布宽度（PDW）及中性粒细胞/淋巴细胞比值（NLR）对新生儿坏死性小肠结肠炎（NEC）手术时机的预测价值。方法：选取2019年1月～2022年1月佛山市妇幼保健院收治的70例NEC患儿,根据治疗方式分为手术组35例和非手术组35例。收集NEC患儿临床资料,并检测两组患儿血清SAA、CRP、外周血PDW及NLR水平。采用单因素、多因素Logistic回归分析新生儿NEC手术的影响因素,受试者工作特征（ROC）曲线分析血清SAA、CRP、外周血PDW及NLR对新生儿NEC手术时机的预测价值。结果：手术组胎龄≥37周、诊断时体重＞2500 g比例低于非手术组,诊断时体重1500～2500 g、精神反应差、腹胀、肠鸣音微弱比例和血清SAA、CRP、外周血PDW及NLR水平高于非手术组（均P＜0.05）。多因素Logistic回归分析显示,诊断时体重＞2500 g为新生儿NEC手术的独立保护因素,精神反应差、腹胀、肠鸣音微弱和血清SAA、CRP、外周血PDW及NLR水平升高为新生儿NEC手术的独立危险因素（均P＜0.05）。ROC曲线分析显示,血清SAA、CRP、外周血PDW及NLR联合预测新生儿NEC手术时机的曲线下面积（AUC）大于各项指标单独预测。结论：血清SAA、CRP、外周血PDW及NLR水平升高与新生儿NEC手术密切相关,四项指标联合预测新生儿NEC手术时机的价值较高。     

脓毒症患儿血清SAA、PCT、CRP水平与预后的关系及其诊断价值分析

摘要 目的：探讨脓毒症患儿血清淀粉样蛋白A（SAA）、降钙素原（PCT）、C反应蛋白（CRP）与预后的关系,并分析三者对脓毒症的诊断价值。方法：纳入我院于2016年8月～2020年6月期间收治的脓毒症患儿60例开展回顾性研究,作为脓毒症组,选取同期于我院进行体检的健康儿童40例作为对照组,比较两组血清SAA、PCT、CRP水平。根据脓毒症患儿1个月内的生存、死亡情况,分成生存组（n=42）、死亡组（n=18）,比较两组临床资料及血清SAA、PCT、CRP水平,经COX回归模型分析脓毒症患儿死亡的危险因素。绘制受试者工作特征（ROC）曲线分析血清SAA、PCT、CRP对脓毒症的诊断价值。结果：脓毒症组血清SAA、PCT、CRP水平显著高于对照组（P＜0.05）。死亡组器官障碍数量＞2个、脓毒性休克患儿占比分别为55.56%、44.44%,显著高于生存组的19.05%、9.52%（P＜0.05）;死亡组入院后1 h内使用抗菌治疗患儿占比为38.89%,显著低于生存组的69.05%（P＜0.05）;死亡组血清SAA、PCT、CRP水平高于生存组（P＜0.05）。COX多因素分析结果显示,器官障碍数量＞2、脓毒性休克及血清SAA、PCT、CRP水平升高是脓毒症患儿死亡的危险因素（P＜0.05）,而入院后1 h内使用抗菌治疗是脓毒症患儿死亡风险的保护性因素（P＜0.05）。血清SAA、PCT、CRP单独及三者联合诊断脓毒症的曲线下面积（AUC）分别为0.808、0.780、0.761、0.912。结论：脓毒症患儿血清SAA、PCT、CRP明显升高,三者升高均为脓毒症患儿死亡的危险因素,且对脓毒症具有一定诊断价值。     

血清SAA、CRP、SIRT1水平与新生儿坏死性小肠结肠炎疾病进展的关系及其诊断价值分析

摘要 目的：探讨血清淀粉样蛋白A(SAA)、C反应蛋白（CRP）、沉默信息调节因子1（SIRT1）水平与新生儿坏死性小肠结肠炎疾病进展的关系及其诊断价值。方法：选择2017年3月至2018年10月华中科技大学同济医学院附属武汉儿童医院新生儿内科诊治的100例坏死性小肠结肠炎患儿作为观察组,另选择同期在华中科技大学同济医学院附属武汉儿童医院出生的100例健康新生儿作为对照组。检测各组血清SAA、CRP、SIRT1水平。比较不同修正Bell分期患儿血清SAA、CRP、SIRT1水平。采用Spearman相关性分析观察组患儿血清SAA、CRP、SIRT1水平与修正Bell分期的相关性。采用受试者工作特征（ROC）曲线评估三项指标对坏死性小肠结肠炎的诊断价值。结果：与对照组相比,观察组血清SAA、CRP水平明显升高,而SIRT1水平明显下降（P<0.05）。不同修正Bell分期患儿血清SAA、CRP、SIRT1水平比较,经单因素方差分析,差异有统计学意义（P<0.05）。修正Bell分期Ⅰ期、Ⅱ期、Ⅲ期患儿血清SAA、CRP水平依次升高,修正Bell分期Ⅰ期、Ⅱ期、Ⅲ期患儿血清SIRT1水平依次降低（均P<0.05）。修正Bell分期与血清SAA、CRP水平呈正相关（P＜0.05）,修正Bell分期与血清SIRT1水平呈负相关（P＜0.05）。ROC曲线分析结果显示,三指标联合检测诊断坏死性小肠结肠炎的曲线下面积（AUC）、敏感度、特异度和约登系数均高于三指标单独检测。结论：坏死性小肠结肠炎新生儿血清SAA、CRP水平升高,而SIRT1水平下降,且与新生儿坏死性小肠结肠炎疾病进展有关,三指标联合诊断坏死性小肠结肠炎的价值较高。     

不同病情手足口病患儿血清肿瘤坏死因子-α、C-反应蛋白、降钙素原的变化及其对预后不良的预测价值研究

摘要 目的：探讨不同病情手足口病（HFMD）患儿血清肿瘤坏死因子-α（TNF-α）、C-反应蛋白（CRP）、降钙素原（PCT）的变化,并分析三者联合检测对预后不良的预测价值。方法：选取2019年1月～2022年1月我院儿科收治的117例HFMD患儿（HFMD组）,根据不同病情分为普通组32例、重症组45例、危重症组40例,根据治疗后预后情况分为预后不良组32例和预后良好组85例,另选取同期50例体检健康儿童作为对照组。收集HFMD患儿基本资料,检测所有研究对象血清TNF-α、CRP、PCT水平。采用多因素Logistic回归分析HFMD患儿预后不良的影响因素,受试者工作特征（ROC）曲线分析血清TNF-α、CRP、PCT水平对HFMD患儿预后不良的预测价值。结果：HFMD组血清TNF-α、CRP、PCT水平高于对照组（P均＜0.05）。普通组、重症组、危重症组血清TNF-α、CRP、PCT水平依次升高（P均＜0.05）。单因素分析结果显示：预后不良组发热≥39℃、发热持续时间≥3 d比例和病情分级为危重症、中性粒细胞比例、TNF-α、CRP、PCT水平高于预后良好组,淋巴细胞比例、心输出量、氧合指数低于预后良好组（P均＜0.05）。多因素Logistic回归分析显示,发热持续时间≥3 d、病情分级为危重症和TNF-α、CRP、PCT升高为HFMD患儿预后不良的独立危险因素,心输出量和氧合指数增加为独立保护因素（P均＜0.05）。ROC曲线分析显示,血清TNF-α、CRP、PCT单独与联合预测HFMD患儿预后不良的曲线下面积分别为0.769、0.793、0.799、0.947,血清TNF-α、CRP、PCT联合预测的曲线下面积大于各指标单独预测。结论：血清TNF-α、CRP、PCT水平升高与HFMD患儿病情加重和预后不良有关,联合检测血清TNF-α、CRP、PCT水平对HFMD患儿预后不良的预测价值较高。     

肺癌胸腔镜术后肺部感染的危险因素探讨及术前CRP/Alb、PCT、SAA对感染风险的预测价值

摘要 目的：分析肺癌胸腔镜术后肺部感染的危险因素并探讨术前C反应蛋白/白蛋白比值（CRP/Alb）、降钙素原（PCT）、血清淀粉样蛋白A（SAA）对感染风险的预测价值。方法：选取2019年3月～2021年10月在徐州医科大学附属医院接受胸腔镜手术治疗的360例肺癌患者,根据肺癌胸腔镜术后72 h是否发生肺部感染分为肺部感染组57例和非肺部感染组303例。收集患者临床资料,术前1d检测患者血清CRP/Alb、PCT、SAA水平。通过单因素和多因素Logistic回归分析肺癌胸腔镜术后肺部感染的危险因素,受试者工作特征（ROC）曲线分析术前血清CRP/Alb、PCT、SAA水平对肺癌胸腔镜术后肺部感染的预测价值。结果：单因素分析显示,肺部感染组年龄≥60岁、吸烟史、糖尿病、手术时间≥3 h、术中出血量≥200 mL、机械通气时间≥12 h、胸腔引流时间≥5 d比例和血清CRP/Alb、PCT、SAA水平高于非肺部感染组（P＜0.05）。多因素Logistic回归分析显示,年龄≥60岁、吸烟史、糖尿病、手术时间≥3 h、机械通气时间≥12 h、胸腔引流时间≥5 d和血清CRP/Alb、PCT、SAA升高为肺癌胸腔镜术后肺部感染的独立危险因素（P＜0.05）。ROC曲线分析显示,术前血清CRP/Alb、PCT、SAA水平联合预测肺癌胸腔镜术后肺部感染的曲线下面积大于各指标单独预测。结论：年龄、吸烟史、糖尿病、手术时间、机械通气时间、胸腔引流时间和CRP/Alb、PCT、SAA升高为肺癌胸腔镜术后肺部感染的危险因素,术前血清CRP/Alb、PCT、SAA联合预测肺癌胸腔镜术后肺部感染的价值较高。     

血清SAA、TSP-1、FA与不明原因复发性流产发病的关系及联合检测的预测价值研究

摘要 目的：探讨血清淀粉样蛋白A（SAA）、血小板反应蛋白-1（TSP-1）、叶酸（FA）与不明原因复发性流产（URSA）发病的关系,分析联合SAA、TSP-1、FA检测对URSA发生的预测价值。方法：选取2019年1月至2021年1月我院妇产科收治的80例URSA患者（URSA组）和同期于我院产科产检的102例正常妊娠孕妇（对照组）,检测血清SAA、TSP-1、FA水平,收集临床相关资料,采用多因素Logistic回归分析URSA发生的影响因素,采用受试者工作特征曲线（ROC）分析血清SAA、TSP-1、FA联合对URSA发生的预测价值。结果：URSA组血清SAA、TSP-1水平高于对照组,FA水平低于对照组（P＜0.05）。URSA组年龄≥35岁、有吸烟史、饮酒史、初中及以下文化程度、生殖道感染的比例高于对照组（P＜0.05）;两组间体质量指数、URSA家族遗传史、职业的比例差异无统计学意义（P＞0.05）。多因素Logistic回归分析结果显示：有吸烟史、饮酒史、生殖道感染以及血清SAA、TSP-1水平较高是URSA发生的危险因素,而FA水平较高是URSA发生的保护因素（P＜0.05）。ROC曲线分析结果显示：血清SAA、TSP-1、FA预测URSA发生的曲线下面积分别为0.744、0.719、0.670,而三项指标联合检测预测URSA发生的曲线下面积为0.872,明显高于各指标单独检测。结论：URSA患者血清SAA、TSP-1水平增高,FA水平降低,且与URSA的发生有关,联合检测血清SAA、TSP-1和FA对URSA的发生具有一定预测价值。     

血清APOC1、LDH及炎性感染指标在难治性支原体肺炎患儿中的表达水平及其与肺通气功能、预后效果的相关性分析

摘要 目的：分析血清载脂蛋白C1（APOC1）、乳酸脱氢酶（LDH）及炎性感染指标在难治性支原体肺炎患儿中的表达水平及其与肺通气功能、预后效果的相关性。方法：选择我院自2019年1月至2022年12月接诊的130例难治性支原体肺炎患儿作为观察组，另选同期在我院体检且结果正常的儿童作为对照组。检测两组入选者血清APOC1、LDH及炎性感染指标[C反应蛋白（CRP）、白细胞介素-6（IL-6）]表达水平、肺通气功能指标[用力肺活量（FVC）、第1秒用力呼气容积（FEV₁）、呼气峰流速（PEF）]；观察组患儿均严格按照《儿童社区获得性肺炎诊疗规范（2019年版）》接受治疗，通过ROC曲线下面积（AUC）评价血清APOC1、LDH及炎性感染指标对难治性支原体肺炎患儿预后不良的预测效能。结果：观察组血清APOC1、LDH、CRP、IL-6表达水平均高于对照组（P＜0.05）；在观察组患儿中，重症组血清APOC1、LDH、CRP、IL-6表达水平均高于轻症组（P＜0.05）；经Pearson相关性分析，难治性支原体肺炎患儿血清APOC1、LDH、CRP、IL-6表达水平均与FVC、FEV1、PEF呈负相关（P＜0.05）；经多因素Logistic回归分析，难治性支原体肺炎患儿血清APOC1、LDH、CRP、IL-6均是其预后不良的独立预测因素（P＜0.05）；经ROC曲线分析，难治性支原体肺炎患儿血清APOC1、LDH、CRP联合IL-6预测其预后不良的AUC为0.930。结论：血清APOC1、LDH及炎性感染指标在难治性支原体肺炎患儿中的表达水平明显升高，与其肺通气功能密切相关，其中APOC1、LDH、CRP联合IL-6预测预后不良的效能较好，值得进一步研究应用。     

Definitions,measurements, and classifications of stimuli,situations, and environments

A review is presented of issues relevant to the definition, measurement, and classification of stimuli, situations, and environments. Problems such as the lack of adequate definitions of concepts, error and bias in measurement procedures, confusion between measurement of a concept and measurement of its behavioral effects, and the lack of agreement among alternative measures are emphasized. It is suggested that concepts be defined in terms of objective characteristics while allowing for the study of the transactional relationship between organism and environment. The work of the ethologists in defining stimuli while studying their relationship to different organismic states and situational contexts is emphasized in this regard. Following Brunswik, it is also suggested that wherever possible there be a representative sampling of variables in natural settings. Note from the editors: From time to time, Human Ecology will publish a review article. Our first in this series is a review by a psychologist of basic definitional and conceptual problems in environmental studies.This paper was prepared while the author was a Visiting Research Fellow at the Educational Testing Service. The support of ETS and my colleagues in the Division of Psychological Studies is gratefully acknowledged. The review was also supported in part by a grant from the Rutgers University Research Council.     

Synthesis,tautomerism, and antimicrobial,anti-HCV,anti-SSPE,antioxidant, and antitumor activities of arylazobenzosuberones

2-Dimethylaminomethylene-1-benzosuberone 1 was coupled with diazotized aniline derivatives to afford a series of the hitherto unreported 2-arylazo-1-benzosuberones 3a–i. The tautomeric structure and the effect of substituents on the tautomeric form (s) of the products 3a–i were discussed. Similar coupling of the enaminone 1 with diazonium salts of heterocyclic amines gave the respective fused azolotriazino-benzosuberones. Some of the newly synthesized compounds showed potent antimicrobial, anti-HCV, antioxidant, antitumor (as topoisomerase I inhibitors), and antimicrobial activities.     

The effect of malathion,diazinon, and various concentrations of zinc,copper, nickel,lead, iron,and mercury on fish

Acute and chronic toxicity tests for malathion, diazinon, copper (Cu), mercury (Hg), lead (Pb), zinc (Zn), nickel (Ni), and iron (Fe) were conducted. Mortalities ofBarilius vagra andCyprinus carpio (common carp) were variable but LC50-96 hr were similar for pesticides. AdultB. vagra seem to be more sensitive to malathion than juvenile carp. Both juvenile carp and adultB. vagra were extremely sensitive to diazinon. Long-term exposure to pesticides modified morphology and behavior. The LC50-96 values for Cu, Hg, and Pb were 0.3, 0.16, and 0.44, respectively, for smaller fish and 1.0, 0.77, and 1.33, respectively, for larger fish. Replicate LC50 values for Zn, Ni, and Fe were somewhat variable, and for these metals, the size of the fish seemed to affect response because LC50 values increased as fish size increased. Cooper, Pb, Zn, and Fe residues following exposure to sublethal concentrations of these metals for 15 d were significantly greater in whole juvenile common carp than in controls.     

Synthesis and properties of N-, O-, and S-phospho derivatives of amino acids, peptides, and proteins

The literature on chemical (i.e., nonenzymic) phosphorylation of amino acids, peptides, and proteins is reviewed through 1982. The review covers synthetic methods, chemical reactions, and physical properties, with emphasis on the techniques used for separation and characterization of the products. Synthetic methods are classified by reagent rather than product, and are illustrated by experimental procedures for the most important methods. Chemical reactions are classified into four groups depending on whether the reaction site is the phospho group, the amino group, the carboxyl group, or in the case of serine the hydroxyl group. Physical data are given for all of the known N-, O-, and S-phospho derivatives of the amino acids, peptides, and proteins, within certain limitations, and are discussed in detail in the section on physical properties. Emphasis is given to the techniques used for separation of the products, such as chromatography and electrophoresis, and for characterization of the products, particularly spectroscopy. Medical and other uses of the products are mentioned.     

Low-frequency dynamics and Raman scattering of crystals, of B-, A-, and Z-DNA, and fibers of C-DNA

Normal modes of vibration of DNA in the low-frequency region (10-300 cm-1 interval) have been identified from Raman spectra of crystals of B-DNA [d(CGCAAATTTGCG)], A-DNA [r(GCG)d(CGC) and d(CCCCGGGG)], and Z-DNA [d(CGCGCG) and d(CGCGTG)]. The lowest vibrational frequencies detected in the canonical DNA structures--at 18 +/- 2 cm-1 in the B-DNA crystal, near 24 +/- 2 cm-1 in A-DNA crystals, and near 30 +/- 2 cm-1 in Z-DNA crystals--are shown to correlate well with the degree of DNA hydration in the crystal structures, as well as with the level of hydration in calf thymus DNA fibers. These findings support the assignment [H. Urabe et al. (1985) J. Chem. Phys. 82, 531-535; C. Demarco et al. (1985) Biopolymers 24, 2035-2040] of the lowest frequency Raman band of each DNA to a helix mode, which is dependent primarily upon the degree of helix hydration, rather than upon the intrahelical conformation. The present results show also that B-, A-, C-, and Z-DNA structures can be distinguished from one another on the basis of their characteristic Raman intensity profiles in the region of 40-140 cm-1, even though all structures display two rather similar and complex bands centered within the intervals of 66-72 and 90-120 cm-1. The similarity of Raman frequencies for B-, A-, C-, and Z-DNA suggests that these modes originate from concerted motions of the bases (librations), which are not strongly dependent upon helix backbone geometry or handedness. Correlation of the Raman frequencies and intensities with the DNA base compositions suggests that the complex band near 90-120 cm-1 in all double-helix structures is due to in-plane librational motions of the bases, which involve stretching of the purine-pyrimidine hydrogen bonds. This would explain the centering of the band at higher frequencies in structures containing G.C pairs (greater than 100 cm-1) than in structures containing A.T pairs (less than 100 cm-1), consistent with the strengths of G.C and A.T hydrogen bonding.     

Synthesis,spectroscopic, and antibacterial activity of tetraazamacrocyclic complexes of trivalent chromium,manganese, and iron

A new series of macrocyclic complexes of type [M(TML)X]X₂, where M = Cr(III), Mn(III), or Fe(III), TML is tetradentate macrocyclic ligand, and X = Cl^?, NO₃^?, CH₃COO^? for Cr(III), Fe(III) and X = CH₃COO^? for Mn (III), has been synthesized by condensation of benzil and succinyldihydrazide in the presence of metal salt. The complexes have been so formulated due to the 1:2 electrolytic nature of these complexes as shown by conductivity measurements. The complexes have been characterized with the help of various physicochemical techniques such as elemental analysis, molar conductance, electronic and infrared spectral studies, and magnetic susceptibility. On the basis of these studies, a five-coordinate distorted square pyramidal geometry, in which two nitrogens and two carbonyl oxygen atoms are suitably placed for coordination toward the metal ion, has been proposed for all the complexes. The complexes have been tested for their in vitro antibacterial activity. Some of the complexes show remarkable antibacterial activities against some selected bacterial strains. The minimum inhibitory concentrations shown by these complexes have been compared with those shown by some standard antibiotics such as linezolid and cefaclor.