Commercial Value Research Articles

Fiction Factory, Part 2

By the beginning of the twentieth century, young writers were part of an economic system that took youth as a commercial value—up-to-the-minute youth provided a fantasy that such new modes of publication seemed to advertise—while also making use of young writers glorying in such hype. Part One of these two essays explored this new character of young people’s writing to indicate an evolving understanding of the juvenile tradition. Young writers now asserted themselves as modern hacks, celebrating their proficiency in dime formulas. In surveying the literary nationalism encoded in dime formulas, Part One also explored how dime fiction kept alive a sense of perennial youth in part through youth’s recurrent and lasting association with the American character. Young writers working in dime formulas by necessity worked within these attitudes—and the baldness of dime formulas made obvious how these so-called “American” attitudes were ideological, encoding troubling assumptions when it came to race and imperialism, part of the manifest destiny and American exceptionalism that cheap print reflected. Part Two is about the afterlife of the dime novel—both in terms of how its formulas continued to haunt American letters, but also in terms of how ongoing literary-critical recovery of texts in the archive of the fiction factory have expanded possibilities for how to regard them. It concentrates on how ideological prescriptions continued to shape expectations, and to shape young writers’ work, in the early twentieth century—after the dime novel seemed to have waned in popularity. At the same time, it foregrounds how the critical afterlife that has sifted that archive informs an understanding of how to read this ongoing work.

Molecular Hybrid Materials for Selective CO2 Electroreduction to Multicarbon Products

AbstractElectrochemical devices, using renewable energy sources, for CO2 reduction (CO2R) coupled with water oxidation is an attractive strategy for the carbon‐neutral generation of solar fuels and chemical feedstocks. Highly reduced multi‐carbon (C2+) products (e.g., ethylene, ethanol, and propanol) are among the most attractive CO2R chemicals because of their commercial value and high energy densities. Here a new molecular hybrid material is reported that combines the capacity of molecular CO2R catalyst to generate CO with the capacity of Cu(0) materials to achieve C2+ products and further tune their reactivity with organic modifiers. A Fe‐A2B2 porphyrin containing two quaternary ammonium groups that set the right CO2R onset potential for a synergistic tandem performance with Cu2O nanocubes as the precursors is prepared. Furthermore, Fe‐A2B2 porphyrin is functionalized with two thiolate substituents in order to covalently anchor the molecular catalyst onto Cu providing an intimate interaction and great stability. The structural design enables a substantially enriched CO species adsorbed on Cu facilitated by the iron porphyrin catalyst that in turn facilitates the evolution of C2+ products, as demonstrated by in situ Raman spectroscopy. In addition, the whole electrode is further coated with phenyl modifiers that regulate the proton content and hydrophilicity in the neighborhood of the active centers. This approach affords Faradaic efficiencies in the range of 50% for ethylene and 77% for C2+ products at an applied potential of −1.05 V versus RHE.

Investigation of fraud in the production of butter: a forensic case study of criminal association

Butter is among the most popular and commercially valuable dairy products. Its high commercial value makes it a major target for adulteration, which aims to reduce production costs by using lower-quality fats and oils from other sources. The annual global market is around USD 30 billion (2023), expected to reach USD 36 billion in 2028, which also justifies the enormous interest in adulteration. In this work, a confirmed case of butter adulteration was studied by Nuclear Magnetic Resonance (NMR) and Stable Carbon Isotopic Ratio Analysis (SCIRA) techniques, employed to detect the inclusion in butter production of vegetable oils, such as soybean and palm oils. A total of 21 samples seized by the Brazilian Federal Police were analysed by NMR and SCIR, and compared to original butter obtained from commercial sources. The composition of all the seized samples was a mixture of butter (dairy fat of animal origin) with fat of vegetable origin (soybean and palm oil) and did not contain milk as a major component. While NMR was an unequivocal choice to discriminate the chemical composition of food samples, identifying the short-chain saturated fatty acids present in milk fat, including the butyryl alkyl chain, SCIRA was able to discriminate the origin of fat present in the butter samples as C3 sources, such as palm vegetable oils.

Evaluation of Consumer Perception of New Aquaculture Products through Applying Focus Group and Check-All-That-Apply Methodologies.

A growing interest in healthy diets has increased demand for fish and seafood, with aquaculture playing a crucial role in meeting this need. Developing new aquaculture products can enhance their commercial value and address consumer demand, but it is unclear which products will be well-received. This study aimed to generate ideas for new products derived from sea bream and prawns, and to gather consumer opinions on these ideas, segmented by gender and age. Two methodologies were used: focus groups and Check-All-That-Apply (CATA). In the focus groups, with two sessions per species and 10 participants each, ideas for aquaculture products were generated and categorized as fresh, dehydrated, fermented, marinated, and canned. The CATA technique, applied to 387 individuals, assessed the acceptability of fresh species, yielding average scores of 6.6 for sea bream and 6.8 for prawns. Sea bream was associated with products like fillets and long-shelf-life loins, while prawns were linked to snacks and toppings. In conclusion, the use of tools like focus groups has shown promising results for developing new aquaculture products. CATA analysis indicated that sea bream should be minimally processed with a long shelf life, and prawns should be processed into dehydrated products. Women preferred traditional products, while men favoured innovative options.

Unveiling the molecular dynamics of low temperature preservation in postharvest lotus seeds: a transcriptomic perspective

BackgroundPostharvest quality deterioration poses a significant challenge to the commercial value of fresh lotus seeds. Low temperature storage is widely employed as the primary method for preserving postharvest lotus seeds during storage and transportation.ResultsThis approach effectively extends the storage life of lotus seeds, resulting in distinct physiological changes compared to room temperature storage, including a notable reduction in starch, protein, H2O2, and MDA content. Here, we conducted RNA-sequencing to generate global transcriptome profiles of postharvest lotus seeds stored under room or low temperature conditions. Principal component analysis (PCA) revealed that gene expression in postharvest lotus seeds demonstrated less variability during low temperature storage in comparison to room temperature storage. A total of 14,547 differentially expressed genes (DEGs) associated with various biological processes such as starch and sucrose metabolism, energy metabolism, and plant hormone signaling response were identified. Notably, the expression levels of DEGs involved in ABA signaling were significantly suppressed in contrast to room temperature storage. Additionally, nine weighted gene co-expression network analysis (WGCNA)-based gene molecular modules were identified, providing insights into the co-expression relationship of genes during postharvest storage.ConclusionOur findings illuminate transcriptional differences in postharvest lotus seeds between room and low temperature storage, offering crucial insights into the molecular mechanisms of low temperature preservation in lotus seeds.

Predesign of an Urban Rainfall Drainage Network with Genetic Algorithms

The pre-design of an urban storm drainage network is proposed with an optimization method consisting of two parts: in one part, the connection of the manholes is proposed so that there is little water flow in the pipes; in the other part, it is based on a genetic algorithm to find the lowest cost of acquisition of the pipes and of the excavation necessary for their installation, complying with several hydraulic and constructive restrictions recommended in construction manuals of networks of this type. The described procedure is made from the linking of the pipes that make up the network (network layout) trying to obtain the smallest sum of the lengths. It is considered that the conduits are of circular section, where their diameters only take commercial values. The slope of each pipe in the network is calculated so that the hydraulic depth of the water flow is 80% of the pipe diameter, in order to approximate the flow conduction capacity of the liquid within it. Finally, its application to a real case is demonstrated, and the hydraulic performance of the pre-designed network is evaluated by simulating the non-permanent free surface flow in the network using the EPA-SWMM 5.1.015 model, in order to ensure that the hydraulic restrictions and assumptions made for permanent flow are met.

Induction of luteolin on postharvest color change and phenylpropanoid metabolism pathway in winter jujube fruit (Ziziphus jujuba Mill. cv. Dongzao)

The postharvest quality of winter jujubes is prone to deterioration, including inevitable pericarp reddening and rapid nutrient loss from the flesh, significantly impacting its edible quality and commercial value. As a crucial metabolic pathway in plants, phenylpropane metabolism not only regulates plant stress resistance but also closely relates to various coloration effects. In this study, we investigated the effects of luteolin solutions on postharvest color changes and phenylpropanoid metabolism in winter jujube. The results indicated that compared to the control group, winter jujube fruit treated with 200 mg L−1 luteolin exhibited improved quality indexes, increased antioxidant capacity (capability of eliminating ABTS and DPPH radicals), and higher activities of antioxidant enzymes(superoxide dismutase (SOD), and catalase (CAT)). This led to a reduction in the oxidation of phenolic substances in winter jujube. Furthermore, luteolin treatment inhibited phenylpropanoid metabolism by suppressing the activities of 4-Coumarate: coenzyme A ligase (4CL), phenylalanine ammonilyase (PAL), and cinnamate 4 hydroxylase (C4H), as well as the expression of ZjUFGT, ZjDFT, and ZjPAL genes. Consequently, anthocyanin and quercetin synthesis were limited while the degradation rate of chlorophyll and carotenoid synthesis were slowed down after luteolin treatment. This resulted in delayed reddening of winter jujube following luteolin treatment. In conclusion, luteolin exhibits potential application prospects as a preservative for inhibiting reddening and browning in winter jujubes.

Identification of key genes involved in lignin and flavonoid accumulation during Tilia tuan seed maturation.

Transcriptomics and phenotypic data analysis identified 24 transcription factors (TFs) that play key roles in regulating the competitive accumulation of lignin and flavonoids. Tilia tuan Szyszyl. (T. tuan) is a timber tree species with important ecological and commercial value. However, its highly lignified pericarp results in a low seed germination rate and a long dormancy period. In addition, it is unknown whether there is an interaction between the biosynthesis of flavonoids and lignin as products of the phenylpropanoid pathway during seed development. To explore the molecular regulatory mechanism of lignin and flavonoid biosynthesis, T. tuan seeds were harvested at five stages (30, 60, 90, 120, and 150 days after pollination) for lignin and flavonoid analyses. The results showed that lignin accumulated rapidly in the early and middle stages (S1, S3, and S4), and rapid accumulation of flavonoids during the early and late stages (S1 and S5). High-throughput RNA sequencing analysis of developing seeds identified 50,553 transcripts, including 223 phenylpropanoid biosynthetic pathway genes involved in lignin accumulation grouped into 3 clusters, and 106 flavonoid biosynthetic pathway genes (FBPGs) grouped into 2 clusters. Subsequent WGCNA and time-ordered gene co-expression network (TO-GCN) analysis revealed that 24 TFs (e.g., TtARF2 and TtWRKY15) were involved in flavonoids and lignin biosynthesis regulation. The transcriptome data were validated by qRT-PCR to analyze the expression profiles of key enzyme-coding genes. This study revealed that there existed a competitive relationship between flavonoid and lignin biosynthesis pathway during the development of T. tuan seeds, that provide a foundation for the further exploration of molecular mechanisms underlying lignin and flavonoid accumulation in T. tuan seeds.

Effect of mild subcritical fluid treatment on meat quality of farmed large yellow croakers

Farmed large yellow croaker fish have stronger fishy smell and less tender texture than wild-caught ones, mostly caused by the high fat accumulation from aquaculture feeding patterns. To improve the commercial value of fillets, this study investigated a mild subcritical fluid treatment with subcritical butane (SBE) and dimethyl ether (SDME). Changes in the chemical compositions, volatile flavor compounds (VFCs) and protein denaturation were determined for 1–5 h treatments. The results showed 24 % and 44 % defatting levels under SBE and SDME treatment, respectively. GC-MS showed that SDME could induce a significant reduction of total VFC content, especially for the dominant aldehydes. There was less n-nonanal (14.65–40.13 mg/kg) and octanal content (1.67–7.21 mg/kg), no detection of trans, trans-2,4-decadienal in the SDME treated samples in comparison to those treated with SBE. The results showed that SDME treatment for 3 h had the best defatting effect, good deodorization effect and less degradation of fish protein.

Intramolecular Quaternary Carbon Nitride Homojunction for Enhanced Visible Light Hydrogen Production.

In this work, an intramolecular carbon nitride (CN)-based quaternary homojunction functionalized with pyridine rings is prepared via an in situ alkali-assisted copolymerization strategy of bulk CN and 2-aminopyridine for efficient visible light hydrogen generation. In the obtained structure, triazine-based CN (TCN), heptazine-based CN (HCN), pyridine unit incorporated TCN, and pyridine ring inserted HCN constitute a special multicomponent system and form a built-in electric field between the crystalline semiconductors by the arrangement of energy band levels. The electron-withdrawing function of the conjugated heterocycle can trigger the skeleton delocalization and edge induction effect. Highly accelerated photoelectron-hole transfer rates via multi-stepwise charge migration pathways are achieved by the synergistic effect of the functional group modification and molecular quaternary homojunction. Under the addition of 5mg 2-aminopyridine, the resulting homojunction framework exhibits a significantly improved hydrogen evolution rate of 6.64mmol g-1 h-1 with an apparent quantum efficiency of 12.27% at 420nm. Further, the catalyst verifies its potential commercial value since it can produce hydrogen from various real water environments. This study provides a reliable way for the rational design and fabrication of intramolecular multi-homojunction to obtain high-efficient photocatalytic reactions.

Sea urchin waste as a promising nutritional source for the polychaete Hediste diversicolor (OF Müller, 1776)

In aquaculture, species diversification emerges as an imperative sustainable strategy, essential for mitigating both biological and financial risks. In this context, the cultivation of sea urchins has gained prominence as an emerging trend. However, its commercial viability still faces several challenges, namely limited growth performance. Integrated multi-trophic aquaculture (IMTA) represents a potentially more profitable model by integrating extractive species to mitigate ecological impacts and promote circular economy principles. The use of polychaetes in IMTA has proven effective in recycling waste from fish aquaculture production, however, their potential should be further explored in low-trophic aquaculture solutions. This study evaluated the potential of reared sea urchin biodeposits as a nutritional feed source for the polychaete Hediste diversicolor (OF Müller, 1776). H. diversicolor juveniles were fed three diets, over 50 days: sea urchin waste (SUW), fish waste (FW) and fish feed (FF). Survival, growth, and protein and fatty acid (FA) contents were assessed. Total survival was observed in all treatments except for FW (98%). Polychaetes fed SUW and FF presented similar specific growth rates. The protein level in the polychaetes fed SUW was significantly lower, reflecting the diet's composition. The FA profile of H. diversicolor was also influenced by the respective diets. The absolute content (μg mg−1 DW) and FA profile of polychaetes were significantly different among treatments, reflecting the composition of the diets. Saturated FA (SFA) represented the dominant class in the polychaetes fed with waste diets, while in FF polychaetes polyunsaturated fatty acids (PUFA) were the major group. Nevertheless, polychaetes fed the waste diets demonstrated the PUFA biosynthetic capacity of this species, showing a considerably higher proportion of essential long-chain FA, compared to diets. Overall, these preliminary results suggest, for the first time, the potential for recycling sea urchin biodeposits into a polychaete biomass with high commercial value, presenting a promising opportunity for low-trophic integrated aquaculture models.

New Amateurism

This Article proposes a new model for the legal and economic relationship between college athletes and their schools. The National Collegiate Athletic Association and its member conferences and schools are besieged with legal challenges over rules that restrain the capacity of athletes to earn compensation for their athletic labor and the commercial value of their identities. The legal challenges are extensive and scrutinize membership rules under labor, employment, and antitrust laws. The days of “amateurism” and the “student-athlete” enjoying judicial and administrative deference are over. For college sports to maintain a character distinct from professional leagues, university athletic programs that feature de facto pro teams and those that rely on students who play a sport should be formally separated.

Revenue Model of Professional Tennis Players Signed under IMG Sports Brokerage Firm

In the context of the flourishing professional tennis leagues and the increasing prominence of commercial value, how to effectively cultivate and promote tennis players has become a focal point for the sports industry and the agency sector. Employing case analysis and literature review methods, this research delves into the training costs and income sources of tennis players, as well as the role of sports management companies in this process. The study initially points out that nurturing a top-tier tennis player requires substantial financial input. However, once the athlete achieves significant success, the returns are highly lucrative, primarily deriving from competition prize money, brand sponsorships, and revenues from commercial activities. Sports management companies, such as IMG, play a crucial role in the selection, training, and commercial promotion of athletes. Through their professional operations, they significantly enhance the commercial value of the athletes. The study provides a detailed analysis of how sports management companies systematically cultivate athletes and maximize their commercial value through diversified means. The findings indicate that the involvement of sports management companies is crucial for enhancing the commercial value and competitiveness of athletes. Addressing the current situation of training and agency management for Chinese tennis players, this paper proposes several recommendations, including improving the legal framework, promoting diversification in sports training, and implementing a "trinity" training mechanism, etc. These recommendations aim to promote the holistic development of Chinese tennis players and advance the standardization and professionalization of the tennis agency industry.

Analysis of the Advantages and Disadvantages of Commercializing Sports Leagues Based on NBA Alliance

Through the analysis of the advantages and disadvantages of commercialization in the NBA league, the conclusion drawn in this article is that the increase in the degree of commercialization ion of the league has a significant impact on the league's visibility, commercial value, economic income, and overall competitive level. It can also drive the development of the entire sports industry and the formation of a country's sports culture. In the process of commercialization, corresponding problems also arise. From the perspective of fairness, certain matches in the league may be affected by commercial interests in the terms of the fairness of referee calls and penalties. Sometimes, concessions may be made for the sake of the viewing and smoothness of the game, which can damage the interests of one team and violate the spirit of fairness and justice in sports. In addition, gray industries such as gambling and soccer are constantly emerging, which have a great impact and harm on society and are difficult to completely avoid. After decades of development, the NBA has successfully captured the development dividends of the media and Internet era, completed its own brand building, and pushed the NBA to the world. The NBA continuously improves its internal rules, introduces a series of policies, works closely with sponsors in various fields, and make it the world's number one professional basketball league. In order for China's professional basketball league to develop and grow on the path of professionalization and commercialization, in addition to learning and drawing on the NBA business model, it is also necessary to combine its own basic national conditions and basketball development status, formulate basketball league and culture with Chinese characteristics.

Interpretation of the Path of the Exportation of Japanese Popular Entertainment Products from the Perspective of Cross-Cultural Communication

The Otome game has received widespread attention and popularity among Chinese and Japanese female players. However, the research on cross-cultural communication of Otome games is still insufficient in the academic community. This paper uses questionnaire surveys and interviews, to get female consumers' satisfaction with different characteristics of Chinese and Japanese Otome games. This paper compares and analyzes the differences between Chinese and Japanese Otome games. The results show that, based on the differences between Chinese and Japanese cultures, the game texts of the Otome game, such as the protagonist's personality, age, and interaction pattern, have undergone significant localization when spread from Japan to China, to satisfy Chinese audiences. Based on this, this paper proposes the following suggestions: cultural products should be localized according to the local culture while retaining some original features during cross-cultural communication, which is beneficial for both media companies and consumers to enjoy commercial and intrinsic value.

The Renovation Scheme of Historical and Cultural Blocks in the City--Taking Yongqing Fang of Guangzhou as an Example

Since 2006, Guangzhou has started the old city renovation work on the Enning Road plot, and the transformation planning has been discussed for more than ten years, it finally changed from "large-scale relocation, large-scale demolition and large-scale construction" to "protection, renewal and utilization", and put forward the urban renewal model of "micro-transformation" in 2016. The renovation was relatively successful, turning Yongqing Fang into a famous scenic spot in Guangzhou and adding huge commercial value. Therefore, the researchers decided to study the value of the "micro-renovation" case of Yongqing Fang in Guangzhou for the renovation plan of historical and cultural blocks in the city. The method of field investigation was adopted in this study. Data and pictures were obtained from field shooting and measurement, as well as some from the official office of Yongqingfang and academic literature. The results show that the "micro transformation" model proposed in the renovation of Yongqing Fang is of innovative significance, which provides a new idea and perspective for the renovation of historical and cultural blocks in the city.

Pengaruh Dosis Phospor Dan Pupuk Cair Pada Tanaman Bunga Kol (Brassica Oleracea Var. Botrytis L)

Cauliflower is a vegetable that has commercial value and excellent prospects for public consumption. According to the Central Statistics Agency of the Republic of Indonesia, cauliflower production has decreased from 2019 to 2021, therefore it is necessary to improve maintenance, one of which is by providing Phosphorus fertilizer to increase productivity. This will increase the rate of photosynthesis to produce high productivity and the correct dose of liquid organic fertilizer (POC) to maximize growth in the vegetative and generative phases thereby increasing the yield of cauliflower plants. This research aims to determine the effect of giving various doses of Phosphorus and POC fertilizers on the growth and yield of cauliflower plants. The research was carried out in the village, Girilayu, Matesih, Karanganyar from February to May 2024. Using the Complete Randomized Block Design (RAKL) method consisting of 2 treatment factors and 3 replications. The first factor is the dosage of Phosphorus (P) fertilizer P1: 100 kg/ha, P2: 150 kg/ha, P3: 200 kg/ha. The second factor is the dose of POC (C), C1: 4 cc/L, C2: 8 cc/L, C3: 12 cc/L. The results research showed (1) Giving various doses of Phospor fertilizer had a very real effect on fresh stover, dry stover, plant diameter, plant weight per plant, and crop weight per plot. However, it does not have a real effect on plant height and number of leaves. (2) Giving various doses of POC had a very real influence on fresh stover, dry stover, plant diameter, and plant weight per plant had a real influence on crop weight per plot and had no real influence on plant height and number of leaves. (3) The interaction between treatments had a very real influence on fresh stover, dry stover, and plant weight per plant, and had no real influence on plant height, number of leaves, plant diameter, and weight per plant plot. (4) The highest results were obtained in the branch pruning treatment 3 weeks after planting with an NPK fertilizer dose of 200 kg/ha, namely a plant weight of 11,997.4 grams per plot (26,644 kg/ha).

The response of Midknight Valencia oranges to ethephon degreening varies in the turning and regreening stages.

Late-ripening citrus plays an important role in the stability of the global citrus industry. However, the regreening phenomenon in Valencia oranges impacts the peel color and commercial value. Ethylene degreening is an effective technique to improve the color of citrus fruits, but this effect may be delayed in regreened oranges. To better clarify this phenomenon, plastid morphology, pigment and phytohormone content in ethephon-degreened Midknight Valencia oranges harvested in different stages were evaluated. Results showed that in fruits harvested at the turning stage, ethephon degreening treatment induced a chloroplast-to-chromoplast transition, and chlorophyll degradation and carotenoid accumulation were accelerated. Conversely, in fruits harvested at the regreening stage, the changes in plastid morphology were minimal, with delayed changes in chlorophyll and carotenoids. Genes related to ethylene biosynthesis and signaling pathways supported these responses. Variations in endogenous auxin, jasmonic acid, abscisic acid and gibberellins could partially explain this phenomenon. The response of Midknight Valencia oranges to ethephon degreening was delayed in the regreening stage, possibly due to the dynamic variations in endogenous phytohormones. © 2024 Society of Chemical Industry.

Cu2O/TiO2 core–shell nanowire heterojunction for high-performance self-powered photodetector

High-performance self-powered photodetectors (PDs) have great commercial value in optical communication, intelligent sensing and medical diagnosis. However, the limited active area of traditional thin film heterojunction seriously restricts the photoelectric performance of the detector. In this paper, the Cu2O/TiO2 core-shell nanowire (NW) heterojunction PD was synthesized for the first time by simple hydrothermal and electrochemical deposition methods, which effectively improved the response performance and response speed of the device based on its broad photoactive area and ordered carrier transport path. The PD exhibits significant diode behavior, with rectification ratios of 543 at ±2 V. The responsivity is as high as 6.8 mA W−1 at zero bias under 490 nm illumination. The short rise and decay times measured are 0.09 and 0.18 s at zero bias, respectively. Obviously, this low-cost, high-performance self-powered Cu2O/TiO2 core-shell NW heterojunction PD shows great promise in future optoelectronic device applications.

Calcium fertilization on the Phalaenopsis ssp. cultivation (Orchidaceae)

The cultivation efficiency and quality improvement of Phalaenopsis sp. production through mineral nutrition has been widely studied. The objective of this study was to evaluate the effects of different concentrations of calcium (Ca) in the nutrient solution on the growth, nutrient uptake, and overall health of Phalaenopsis sp. Seedlings obtained from in vitro propagation at 6 months of age were fed biweekly with a nutrient solution suggested by Hoagland and Arnon with modified Ca concentrations of 0 mM, 1.25 mM, 2.5 mM, 5 mM, 7.5 mM, and 10 mM. After 24 months, characteristics such as number of leaves, width and length of the largest leaf, total leaf area, dry mass of leaves and roots, leaf texture, and number and dry mass of flowers were evaluated. Macronutrient content was determined from leaf dry mass. Substrate pH and electrical conductivity were also measured. Increasing Ca concentrations up to 6.25 mM improved leaf length, total leaf area, number of flowers and flower dry mass. Leaf texture and electrical conductivity of the substrate increased up to a Ca concentration of about 2.5 mM. Leaf nitrogen and phosphorus contents increased with higher Ca concentrations. Optimal Ca fertilization at 6.25 mM had positive effects on both vegetative and reproductive growth, with no visual symptoms of Ca deficiency observed during vegetative development. These results emphasize the importance of precise and tailored nutrient management, not only to avoid hidden deficiencies, but also to maximize the quality and commercial value of Phalaenopsis sp. plants.