Raw Silk Research Articles

The Influence of Lifestyle and Brand Image on Purchasing Decisions for Mundo Products with Purchase Intention as an Intervening Variable

The textile industry in Indonesia has great potential with various types of raw materials, including cotton, silk, rattan, and polyester. An integrated supply chain is the key to success in this industry, which is currently experiencing positive growth. Socks are an important textile product and have become part of the lifestyle, especially in the digital era. This study aims to understand the effect of lifestyle and brand image in the digitalization era on purchasing decisions for Mundo socks products through purchase intention as an intervening variable. This research uses descriptive quantitative methods and involves 250 retail stores spread across the city of Medan. The research sample size was determined by the Slovin method with an error rate of 5% resulting in 154 respondents. data was collected with various research instruments, literature studies and research questionnaires. The results showed that Lifestyle and Brand Image and Purchase Intention as intervening variables had a partial and simultaneous effect on Purchasing Decisions at PT. Jumbo Niaga Lestari. And Lifestyle is the most dominant variable influencing Purchasing Decisions at PT. Jumbo Niaga Lestari.

Studies on the Effect of Differential Feeding on the Commercial Characteristics of Mulberry Silkworm (Bombyx mori L) in Wet Summer in West Bengal, India

The study evaluated the effect of feeding of different maturity level of mulberry leaves i.e. tender, medium, mix, mature, over mature leaves and feeding of shoot during late stages on the commercial characteristics of crossbreed (N×M12 (W)) during wet summer in West Bengal for sustainable development in Sericulture Industry. The data was compared with control where conventional leaf feeding method was followed. The most of the larval and cocoon characters were recorded significantly higher in shoot feeding fed batch and Medium leaves fed batches. Significantly higher post cocoon parameters viz. average filament length, nonbreakable filament length; renditta and raw silk recovery percentage etc. were recorded in medium leaf fed batches and shoot rearing batch. Though qualitative analysis of leaf suggested that tender leaf is more nutritious than other maturity level of leaves but due to prevailing of high moisture in the rearing room as well as in rearing bed during wet summer, it becomes difficult for silkworm larvae to release water during late stage and particularly during spinning if silkworms are fed with high moisture containing tender leaves. More important thing is that whatever water released by silkworm larvae particularly during the end of Vth instar and initiation of spinning, fifty percent of it goes for silk spinning. Present investigation indicates that it is better to feed silkworm larvae with shoot and medium leaf during late instar in wet summer. Mature and over mature leaves fed batch showed inferior performance in terms of all the characters due to their poor nutritional composition.

The Foreign Trade of Tabriz: 1800-1900

AbstractUnder the early Qajars, Tabriz rose from being a provincial backwater in ruins to the foremost commercial entrepôt of Iran. Initially, its insignificant foreign trade was limited to Turkey (mostly raw Gilani silk), but, when the major commercial southern and western supply routes of Iran became unsafe and costly, trade moved to the northern route. Moreover, after Russia opened its territory to European goods in 1821, these also flowed via Tiflis to Tabriz. When ten years later Russia revoked this permission, the Tiflis trade moved to Tabriz via Trabzon, gradually replacing not only the Tiflis route but also the Istanbul-Erzerum route. This turned Trabzon into a quasi-“Iranian” port, as initially most of its imports were destined for or coming from Iran. Four-fifths of imports to Tabriz were European fabrics. Initially these had come from Russia, but, as of the 1820s, such were replaced by British, German, French, and Swiss fabrics. By mid-century, Manchester fabrics dominated the import trade of Tabriz. Thus, Great Britain took Russia's place as its primary trading partner, although by 1900 the tables had turned. During the majority of the nineteenth century, Caucasian Armenian merchants dominated Tabriz's foreign trade, with European merchants playing an important but limited role in the import of Manchester goods and the export of raw silk. After 1870, the importance of Tabriz as the commercial hub of N.W. Iran decreased, due to various reasons such as the outbreak of the Gilan silk disease, Russia stopping the transit of non-Russian goods, and the opening of the Suez Canal, but also because it became cheaper to import goods via Bushehr and Baghdad-Kermanshah. Nevertheless, even with a diminished role as a financial center and less foreign trade, Tabriz continued to be Iran's major commercial center until WW I.

Green synthesized clavate-shaped ZnO modified silk fabric with aging resistance and outstanding antibacterial and UV-shielding properties

Silk, a popular luxury textile with many years of history, is easy to embrittle and adsorb bacteria when stored for a long time or exposed to sunlight, which affects its service life. To improve the silk fabrics with excellent antibacterial activity, washing and aging durability, and UV shielding, multifunctional silk fabrics were designed and fabricated via a green finishing approach. Here, we proposed a simple strategy to fabricate silk fabrics with multi-functions via coating clavate-shaped ZnO nanoparticles (ZF-silk fabrics) by dipping and pressing for cycles. The scanning electron microscope (SEM), fourier transform infrared (FTIR), ultraviolet visible spectrophotometry (UV–Vis), and X-ray diffraction (XRD) were used to analyze the structure and properties of fabricated ZF-silk fabrics. Compared with raw silk fabric, the fabricated ZF-silk fabrics represented excellent UV shielding, good tensile strength, and superior antibacterial activity. Notably, the ZF-silk fabrics had good washing stability and aging resistance. In addition, the ZF-silk fabrics possessed superior antibacterial activity before and after aging treatment (under UV radiation for 72 h). Therefore, the durable and multifunctional ZF-silk fabrics indicate great potential for achieving to realize a long service life of the fabrics.

Explainable deep learning model for automatic mulberry leaf disease classification.

Mulberry leaves feed Bombyx mori silkworms to generate silk thread. Diseases that affect mulberry leaves have reduced crop and silk yields in sericulture, which produces 90% of the world's raw silk. Manual leaf disease identification is tedious and error-prone. Computer vision can categorize leaf diseases early and overcome the challenges of manual identification. No mulberry leaf deep learning (DL) models have been reported. Therefore, in this study, two types of leaf diseases: leaf rust and leaf spot, with disease-free leaves, were collected from two regions of Bangladesh. Sericulture experts annotated the leaf images. The images were pre-processed, and 6,000 synthetic images were generated using typical image augmentation methods from the original 764 training images. Additional 218 and 109 images were employed for testing and validation respectively. In addition, a unique lightweight parallel depth-wise separable CNN model, PDS-CNN was developed by applying depth-wise separable convolutional layers to reduce parameters, layers, and size while boosting classification performance. Finally, the explainable capability of PDS-CNN is obtained through the use of SHapley Additive exPlanations (SHAP) evaluated by a sericulture specialist. The proposed PDS-CNN outperforms well-known deep transfer learning models, achieving an optimistic accuracy of 95.05 ± 2.86% for three-class classifications and 96.06 ± 3.01% for binary classifications with only 0.53 million parameters, 8 layers, and a size of 6.3 megabytes. Furthermore, when compared with other well-known transfer models, the proposed model identified mulberry leaf diseases with higher accuracy, fewer factors, fewer layers, and lower overall size. The visually expressive SHAP explanation images validate the models' findings aligning with the predictions made the sericulture specialist. Based on these findings, it is possible to conclude that the explainable AI (XAI)-based PDS-CNN can provide sericulture specialists with an effective tool for accurately categorizing mulberry leaves.

Technology of preparation of defective cocoons for reeling

In this article, one of the ways to effectively use non-smooth defective cocoons that cannot be used in reeling is covered. An analysis of the development of the silk industry and the scientific work currently being carried out in this direction is presented. Water and air permeability of defective cocoons produced during cocoon sorting, evaporation regimes, influence of solution concentration on cocooning was studied by single cocooning. It is based on the fact that the amount of raw silk can be increased by introducing the spinning of defective cocoons. In order to achieve the set goal, separate cooking and water filling regimes of defective cocoons depending on the type of defect were determined based on experiments. A new processing method is recommended for cooking defective cocoons. Recommended technological parameters and modes for workshops are presented in the tables. Defective cocoons with a new concentration based on the type of defect recommended.

Zinc oxide nano-flowers improve the growth and propagation of mulberry cuttings grown under different irrigation regimes by mitigating drought-related complications and enhancing zinc uptake

Silkworm larvae mainly consume mulberry leaves; therefore, mulberry cultivation is important for the production of raw silk. Drought stress and micronutrient deficiency (Zn) are known to affect the propagation of mulberry cuttings. In this purview, the current investigation attempted to inspect the efficacy of different concentrations of zinc oxide nano-flower (ZnNFs) applied through both soil admixture and foliar spray on the propagation of mulberry cuttings grown under deficit irrigation regimes. The overall results demonstrated that the ZnNF-treated plant cuttings were well-adapted to drought stress and performed better in comparison to the control set. Out of the tested concentrations – ZnNF-10 (applied as 10 mg/kg soil and 10 ppm as foliar spray thrice) was found to be optimum, showing relatively better initial root establishment, the emergence of leaves, and survival and sprouting percentage. Further studies also confirmed an improvement in the accumulation of photosynthetic pigments, carbohydrates, and protein content even under extreme drought conditions. Most importantly, the ZnNF-10 treatment contributed to ROS detoxification and cell membrane protection by enhancing the pool of antioxidant enzymes. The study further demonstrated that ZnNF-10 application enhanced zinc content by 147.50%, 179.49%, and 171.99% in root, shoot, and leaves of the treated cuttings; thereby, improving the bioaccumulation factor of the plant parts. All of these interactive phenomena led to an increment in shoot height, biomass, leaf area, and leaf number of cuttings. These findings, therefore, indicated that ZnNFs can be developed as a promising nano-fertilizer for mulberry growth facilitating Zn uptake and mitigation of drought-induced complications.

High-Performance Li-S Batteries with a Minimum Shuttle Effect: Disproportionation of Dissolved Polysulfide to Elemental Sulfur Catalyzed by a Bifunctional Carbon Host.

A long cycle-life Li-S battery (both the coin cell and pouch cell) is reported with minimum shuttle effect. The performance was achieved with a bifunctional carbon material with three unique features. The carbon can catalyze the disproportionation of dissolved long-chain polysulfide ions to elemental sulfur; the carbon can ensure homogeneous precipitation of Li sulfide on the host carbon, and the carbon has a honeycomb porous structure, which can store sulfur better. All the features are demonstrated experimentally and reported in this paper. Few dissolved polysulfides are found by high-performance liquid chromatography in the electrolyte of the Li-S batteries during cycling, and only dissolved elemental sulfur is detected. The unique porous structure of the carbon made from raw silk is revealed by scanning electron microscopy. The N-containing functionalities that were introduced to carbon from the amino acids of raw silk can catalyze the disproportionation of the dissolved Sn2- to solid S8 at the cathode side, thereby mitigating the shuttle effect. In addition, the hierarchical honeycomb porous structures generated by a carbonization process can physically trap high-order lithium polysulfides and sustain the volume change of sulfur. With the synergistic effects of the unique structures and characteristics of the carbon prepared at 800 °C, the sulfur/carbon composite delivers a high reversible capacity of over 1000 mAh g-1 after 100 cycles with a sulfur content of 1.2 mg cm-2 in a pouch cell.

Silk based adsorbents for remediation of heavy metal ions from wastewater

Silk, a natural biopolymer possessing superior adsorbent properties, is excessively utilized in water remediation. This study illustrates degumming of silk fibroin using microwave radiations and batch adsorption of nickel ions from aqueous (aq.) solution. The removal of sericin from silk was confirmed through surface, functional group and thermal analysis. The water contact angle of degummed silk was observed to be 163°, exhibiting superhydrophobicity. The degummed silk fibroin demonstrated superior adsorption capacity of 27 mg/g in contrast with raw silk of 17 mg/g at constant adsorbent dose and contact time, and the former exhibited lowered adsorption time by 2 h compared to the latter.

Studies on influence of various stages of mulberry leaf in the growth and cocoonic parameters of silkworm Bombyx mori (L.)

The objective of this work was to determine the effects of different stages of mulberry leaves on growth performance of treated larvae of Bombyx mori L. (Lepidoptera, Bombycidae) and characters of the resulted cocoons were evaluated. Results showed that the food consumption rate and assimilation rate were greatest for larvae fed on tender and over matured mulberry leaves as compared to larvae fed on mature leaves. Assimilation and conversion efficiencies were very high in the larvae grown on matured mulberry leaves (0.189 and 1.99% respectively). Moreover, the larvae fed on matured mulberry leaves showed higher growth rate, cocoon weight and shell ratio. Among the three different growth stages of leaves, the matured leaves were found to be the best food for final instar larvae of Bombyx mori L. which promotes maximum larval growth and it gains to quality cocoon and raw silk production.

Current Scenario of Sericulture Industry in Traditional Silk Producing States of India

The study concerned about the growth rate of mulberry area, production and productivity and cocoon and raw silk production and productivity five major traditional sates (Tamil Nadu, Karnataka, West Bengal, Andhra Pradesh, Jammu Kashmir and West Bengal) in India during 1980-81 to 2016-17. In Tamil Nadu, Compared with all the seven periods the highest significant compound growth observed in mulberry area and production was 17.50 per cent, 21.02 per cent during the period IV (1998-99 to 2001-02) and mulberry productivity 2.63 per cent since improved mulberry varieties like S36 and MR2 was released during that period II (1988-89 to 1997-98). Overall period (1980-81 to 2016-17), the cocoon productivity (2.67%) was positively significant in Tamil Nadu. There was a positively significant growth rate of cocoon production and productivity in Karnataka, Andhra Pradesh and West Bengal. Even though there was negative significant growth in productivity (-7.62%), but the growth of production (0.51%) was non-significant in Jammu Kashmir. There is significant positive growth of production (2.33%) and productivity (2.96%) in India. In Tamil Nadu, The growth rates of raw silk production (2.17%) and productivity (5.25%) was found highly significant during the overall Period (1980-81 to 2016-17). There was a highly significant growth rate of raw silk production and productivity in Karnataka, Andhra Pradesh, West Bengal and for India as a whole. In Jammu Kashmir; the growth rates of cocoon production alone (4.14%) were significant.

A STUDY OF COCOON FILAMENT OBTAINED IN RE-FEEDING

This article provides information about cocoon automatic- and mechanical cocoon-reeling machines in silk manufacturing enterprises of our republic, as well as the state of cocoon cultivation. The technological properties of the cocoon shells grown repeatedly in local conditions of the hybrids of Chinese silkworms and the compliance of the raw silk produced from them with the requirements of the international standard have been studied. The compensation period in raw silk production is analyzed from a theoretical point of view. The factors influencing the linear density of raw silk during reeling, the methods of controlling the linear density of raw silk produced in mechanical and automatic machines are solved theoretically and according to the results of practice, including the time spent to fill the broken cocoon threads and the amount of defective length determined in 100 grams of cocoon thread. The quality of raw silk that can be obtained from cocoons grown in different seasons was analyzed based on experimental results. It has been proven from a practical point of view that the probability of producing high-quality raw silk from the cocoons of the III-IV seasons is low.

IT IS METHODICAL TO CONTROL THE MECHATRONIC SYSTEM IN THE DEANIMATION OF THE LIVING COCOON

In this article, we can see different methods of killing the live cocoon in order to preserve the quality of the silk, and the methods of killing them are divided into different groups. We will also have information about the initial processing of the cocoon. Therefore, from the cocoon to the New Year season, raw silk is produced non-stop throughout the year. As a result of our research, we can see that deadening the living cocoon, reducing the high moisture content in it, is a pre-treatment process of the cocoon.

Silk/Polyamidoamine Membranes for Removing Chromium VI from Water.

Polyamidoamine hydrogels prepared by the radical post-polymerization of α,ω-bisacrylamide-terminated M-AGM oligomers, in turn obtained by the polyaddition of 4-aminobutylguanidine with N,N'-methylenebisacrylamide, were reinforced with raw silk fibers, which can establish covalent bonds with the polyamidoamine matrix via reaction of the amine groups in the lysine residues with the acrylamide terminals of the M-AGM oligomer. Silk/M-AGM membranes were prepared by impregnating silk mats with M-AGM aqueous solutions and subsequent crosslinking by UV irradiation. The guanidine pendants of the M-AGM units imparted the ability to form strong but reversible interactions with oxyanions, including the highly toxic chromate ions. The potential of the silk/M-AGM membranes to purify Cr(VI)-contaminated water down to the drinkability level, that is, below 50 ppb, was tested by performing sorption experiments both in static (Cr(VI) concentration 20-2.5 ppm) and flow conditions (Cr(VI) concentration 10-1 ppm). After static sorption experiments, the Cr(VI)-loaded silk/M-AGM membranes could easily be regenerated via treatment with a 1 M sodium hydroxide solution. Dynamic tests performed using two stacked membranes and a 1 ppm Cr(VI) aqueous solution reduced Cr(VI) concentration down to 4 ppb. Remarkably, the use of renewable sources, the environmentally friendly preparation process, and the goal achieved meet eco-design requirements.

Multi-objective optimization of raw silk parameters using a combined support vector regression-genetic algorithm-desirability function approach

This work deals with the multi-objective optimization of raw silk qualities using the desirability function approach. Raw silk qualities are primarily governed by silk cocoon characteristics. In this paper, the complexity of simultaneous optimization of conflicting raw silk properties are resolved using a hybrid multi-objective optimization model where predictive power of support vector regression and optimization capability of genetic algorithm are employed with desirability function. The individual desirability of raw silk qualities is assessed from the four silk cocoon properties such as defective cocoon percentage, shell ratio, cocoon weight and cocoon volume. Raw silk parameters such as filament length, tenacity, renditta and reelability are combined together to express overall desirability. The proposed multi-objective optimization model can determine the optimum cocoon parameters essential to produce good-quality raw silk.

Extraction and Biological Application of Silk Sericin: An Over View

The sericin is a byproduct which is obtained from silk industries. Mainly Bombyx mori is responsible for the synthesis of sericin. Sericin is proteinaceous in nature and is biodegradable. The two major components of silk i.e., fibroin and sericin have to be removed from raw silk to give it a luster or shine by degumming process. Silk sericin and its nutritive value has now been known to everyone in China and Japan. Many uses of sericin like pharmaceutical uses, textile -based uses, use in cosmetics has now been explored in India but the use of sericin as dietary supplement is not still discovered. Tons of silk has been produced in India and the degummed water goes as waste which can be used. Nanotechnological discoveries of sericin have given foremost advances in the field of biomedicine and tissue engineering, with special consideration the applications of a natural product for the enhancement of new pharmaceutical formulations and biomaterials. Sericin conjugated nano formulation are a vast example of nanotechnological tools applied to the blueprint of an biocompatible, economically viable, and biodegradable compound as well as its use as nanomedicine. The aim of this review is to highlight the application of sericin in different fields like in biomedical, food additives and the nano formulation of silk sericin.

ИССЛЕДОВАНИЕ ТЕМПЕРАТУРНЫХ РЕЖИМОВ ПРИ ХРАНЕНИИ ЖИВЫХ КОКОНОВ РАЗЛИЧНЫМИ СПОСОБАМИ

The article presents findings from experimental studies carried out in the industrial conditions to determine the rate of temperature change in various layers of cocoons when they are kept on the floor in bulk, in containers of a new design, which represents scientific and practical interest. Certain disadvantages of the existing method of storing the living cocoons have been observed. The ways of preventing self-heating of cocoons in the existing way of their storage are indicated. The findings show that when live cocoons are kept in containers of a new design, they can be stored for 2-3 days without shoveling and overheat to the extent that is considered acceptable in given storage methods. Application of the findings allows preserving the quality indicators of cocoons, which is an important indicator for making high-quality raw silk, which contributes to raise economic potential of the republic.

Growth And Dietary Efficiency of Artificial Nutrients Fortification of Bombyx Mori (L).

Sericulture has been serving the humanity by providing natural animal silk for several centuries. The quality as well as the quantity of mulberry leaves along with environmental factors have a direct influence on the production of raw silk spun by Bombyx mori L. Larvae before pupation in the form of cocoons. Study on the nutritional aspect of the silkworm is an essential prerequisite for its proper commercial exploitation. Silkworm nutrition is the sole factor which has almost individually augmented the quality and quantity of the silkworm cocoon production and productivity. Despite the balancing of the silkworm nutrients by the mulberry leaf, the quantity available is not sufficient for the larval growth owing to variation in mulberry plant and in its management. This created a requirement for the dietary fortification with good quality mulberry leaves in optimum quantity for successful cocoon production. In this study, mulberry leaves were fortified with Honey, Glucose, B- complex, Lemon and Calciferol and the growth and dietary efficiency of the larvae fed with the fortified diet were evaluated. The results indicated improvement in terms of growth as well as cocoon parameters. Our studies support the concept of dietary fortification the Mulberry leaves fed to silkworm for netter production of silk.

Studies of the silkworm enzyme activity and their correlations with economic variables

The experiment was conducted to analyse the larval performance and economic traits of bivoltine silkworm breeds of silkworm (SK-1, SK-6, SK-22, SK-28, SK-33, CSR4, CSR2, NB4D2, DUN6 and APS4) during spring season. The haemolymph total protein, succinate and gultamate dehydrogenase activities were estimated and their correlation with economic traits were also worked out. The results of the study confirmed that among ten bivoltine silkworm breeds, highest haemolymph SDH activity of 3.47 µmoles/ml/mgprotein/min was recorded in the silkworm breed SK1 and least SDH activity of 1.58 µmoles/ml/mg protein/min was recorded in the breed APS4. The highest peak of succinate dehydrogenase activity of 2.65 µmoles/ml/mg protein/min was observed on 7th day of the 5th instar and lowest peak of succinate dehydrogenase activity of 2.39 µmoles/ml/mg protein/min was observed on 4th day of the 5th instar. GDH activity of 0.46 µmoles/ml/mg protein/min was recorded highest in the silkworm breed SK1 and lowest of 0.15 µmoles/ml/mg protein/min was recorded in silkworm breed APS4. The highest peak of haemolymph GDH of 0.36 µmoles/ml/mg protein/min was recorded on 7th day of 5th instar and lowest peak of 0.26 µmoles/ml/mg protein/min was recorded on 4th day of 5th instar. The correlational studies revealed that haemolymph total protein, SDH and GDH were found to be positively corelated with yield by weight and number (cocoon), weight of mature larvae, shell weight ,cocoon weight, shell ratio percent, silk productivity, rate of pupation, fecundity, raw silk percentage and length of filament. Thus, the study revealed that silkworm breeds like SK1, SK6, SK22 and SK28 as productive breeds and hence may be used for future breeding programmes for evolution of new robust silkworm breeds

Breeding for mulberry improvement: A review

Sericulture, the art of raising silkworms, plays a great role for livelihood support in parts of southern Karnataka, particularly in the districts of Chikkaballapura, Kolar, Mysore, and Ramanagaram, as well as in the states of Andhra Pradesh, Telangana, Tamil Nadu, West Bengal, and Assam. Among all the species of silkworm, Bombyx mori is the most commercially raised silkworm for raw silk production which depends on mulberry as a host plant. Mulberry is a perennial plant that grows quickly with deep root system and produces a lot of biomasses. In addition to its usage in sericulture, the leaf extract is recognized to have significant therapeutic effects. Yield of mulberry leaves is contributed by three key elements such as superior variety, package of practices and integrated pest control. Although many mulberry genotypes can be grown commercially, there is a need to produce mulberry varieties that are suitable for a given region and for both rainfed and irrigated environments. The development of genotypes with inherent resistance to pests and diseases is essential, as chemical control is not practicable. The genetic improvement methods include conventional breeding through hybridization and selection, mutagenesis, molecular approaches including markers, and genetic engineering. Development of improved varieties of mulberry is the key to support sericulture farmers.