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Journal of Scientific & Industrial Research

 

 

 

 

ISSN: 0022-4456

CODEN: JSIRAC (62) (7) 651-744 (2003)

VOLUME 62

NUMBER 7

JULY 2003

 

CONTENTS

Review Papers

659

Medicinal significance of nitroimidazoles some recent advances

 

 

 

 

V K Kapoor, Renu Chadha, Praveen K Venisetty & S Prasanth

Various aspects on the chemistry and modes of action of nitroimidazoles are discussed.

 


 

 

666

Prospects of siloxane membrane technology for gas separation a review

 

 

 

 

 

 

 

 

 

 

 

 

B S R Reddy & V Senthilkumar

Reviews the factors affecting the permeability value and an up-to-date chemical modification of siloxane membranes and its transport parameters.

678

Non-conventional machining process as viable alternatives for production with specific reference to electrical discharge machining

  

H S Payel & B L Sethi

Describes progress with respect to present situation and future trends in non-conventional machining, particularly, about the Electrical Discharge Machining to review extensively what has been done in the past. It is basically a critical assessment of the present state-of-art of the wide and complex field of non-conventional machining, based on the information obtained from the relevant literature, industry, and discussion at seminar and conferences. This is also illustrated by several specific examples. Some recent developments and new trends are highlighted. Some of these techniques can be competitive with conventional manufacturing methods. In some of the cases they are the only efficient solution for realizing the specific industrial products.

Papers

683

Mild steel corrosion reduction in water by uptake of dissolved oxygen by Rhodotorula mucilaginosa

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  

  

M P Dabhole & K N Joishy

The study aims at determination of corrosion rate reduction in water by uptake of dissolved oxygen by Rhodotorula micilaginosa. Corrosion of mild steel in water due to oxygen is a common phenomena in cooling towers and process industries. Dissolved oxygen  uptake  at  various  pH   acidic,  neutral  and  alkaline conditions indicate that corrosion reduced at pH 7. The uptake of ferrous ions by Rhodotorula mucilaginosa is detected by Atomic Absorption Spectrometry (AAS). The affinity for uptake of cadmium ions by Rhodotorula mucilaginosa in presence of ferrous ions is confirmed by AAS. Both weight loss and electrochemical method give analogous data in corrosion reduction for Thane creek water.

 

690

Development of specialty paper is an art: alkali resistant paper from indigenous raw material Part VI

 

 Dharm Dutt, R S Malik, C H Tyagi &
J S Upadhyaya

ASSR paper bears high degree of resistance to alkali used in the wrapping and packing of alkaline materials such as, soaps, and adhesives. Important characteristics of ARSR paper include freedom from discoloration with milk alkali present in the soap case and resistance to the growth of fungi. The product goes through two principal steps namely, transportation and distribution. Mechanical strengths like, bursting and tearing strength are essentially required for  handling  of  product  and  protecting  the  product  from  damage. In the study, eucalyptus, bamboo and sawmill waste of pine are used to develop ARSR paper, which fulfils the specifications, prescribed by BIS.

694

Development of specialty paper is an art : barrier paper from indigenous raw materials Part VII

 

 Dharm Dutt, C H Tyagi, R S Malik,
J S Upadhyaya & Alok Kumar

Explores the possibility of manufacturing barrier base paper from indigenous raw materials. Use of indigenous raw materials develop important properties like, klemn absorbency, wet strength, and castor oil penetration, which are essentially required for barrier base paper. Another important property is the high opacity, which is required to prevent, see through problems in sun-mica. Using TiO2 filler can solve this defect in sun mica. The laboratory made barrier paper fulfils all the requirements.

699

Oxygen-peroxide (Eop) delignification and peroxide (P) bleaching of bagasse kraft pulp

 


El-Barbary M Hassan

An EopQP sequence is used to delignify and bleach a bagasse kraft pulp. In the Eop step, a reduction of the kappa number by 60 per cent and improvement in the brightness by 16.5 units are achieved. The Q step reduces the content of Mn, Fe and Cu ions by 48-60 per cent. A bleaching system consisting of 4 per cent H2O2, 2.5 per cent NaOH, 0.3 per cent MgSO4, and 0.05 per cent DTPMPA bleach the EopQ treated pulp to 80 per cent ISO brightness, 2.6 kappa number and ~700 mL/g viscosity. The brightness is increased to 82 per cent at reasonable viscosity values (> 650 mL/g) by adding 0.05 per cent 1,10-phenanthroline to a bleaching system containing lower peroxide concentration (3 per cent) and higher DTPMPA charge (0.1 per cent).

707

Generation of chlorinated organic material in eucalyptus pulp bleaching using different bleaching sequences

 

M Roy, S K Chakrabarti, N K Bhardwaj, Sandip Chandra, Sanjay Kumar, Sarabjeet Singh, P K Bajpai & M B Jauhari

Deals with the kraft pulping of eucalyptus and conventional bleaching with chlorine, hypochlorite, and chlorine dioxide and characterization of effluents for toxic pollutants. Effect of different pulping and bleaching conditions on the generation of pollutants, e.g., colour, COD, AOX, EOX, EOX, POX is also studied.

714

Incidence of killer yeast in cane molasses and status of industrial yeasts with respect to killer character

 

Bijender K Bajaj, Neeraj Dilbaghi & S Sharma

In all, 210 yeast strains from molasses are screened for killer, sensitive or neutral character against reference killer (Saccharomyces cerevisiae MTCC427) and sensitive strains (Saccharomyces cerevisiae MTCC 473). Thirteen strains are found to be of killer phenotype and 32 sensitive, and rest of the isolates belong to genera Saccharomyces, Schizosaccharomyces, Khuyveromyces, Hansenula, Pichia, Kloeckere, and Torulopsis were of neutral character. All the killer strains belongs to genera Sacchromyces. Twenty-one industrial yeast strains including distillery and brewery yeasts tested are found to be of sensitive character.

718

Electrodeposition of zinc-nickel alloy

 

 

 

 

 

 

 

 

 

 

 

 

Visalakshi Ravindran & V S Muralidharan

Studies on the electrodeposition of zinc-iron group alloys are of academic and technological interest. The anomalous codeposition and enhanced corrosion protection of zinc-nickel alloy deposits make the search for newer plating bath formulations. Zinc and nickel are codeposited from sulphamate bath and 82 per cent zinc is obtained in the deposit. The suphamate bath developed offered 100 per cent current efficiency with 24 per cent throwing power.

Report

723

International technology trade a report

 

J K Johri

 

Book Reviews

727

         Productivity and economic performance in the Asia-Pacific region
         Reviewer: S Mohan

         Environmental leadership in developing countries Transnational relations and biodiversity policy in
        Costa Rica and Bolovia

                      Reviewer: V P Jain

Sci-Tech Update

732

         How hydrogen can save America

 

         The green wall of China

 

         Announcements

 

 

 

AUTHOR INDEX

Alok Kumar

694

Jauhari M B

707

Roy M

707

Bajaj Bijender K

714

Joishy K N

683

Sandip Chandra

707

Bajpai P K

707

Johri J K

723

Sanjay Kumar

707

Bhardwaj N K

707

Kapoor V K

659

Senthilkumar U

666

Chadha Renu

659

Malik R S

690,694

Sethi B L

678

Chakrabarti S K

707

Muralidharm V S

718

Sharma S

714

Dabhole M P

683

Ravindran Visalakshi

718

Singh Sarabjeet

707

Dilbaghi Neeraj

714

Payal H S

678

Tyagi C H

690,694

Dutt Dharm

690,694

Prasanth S

659

Upadhyaya J S

690,694

Hassan El-Barbary M

699

Reddy B S R

666

Venisetty Praveen K

659

 

 

 

KEYWORD INDEX

Alkali resistant paper

690

Gas separation

666

Peroxide bleaching

699

Alkaline material

690

Indigenous raw material

690,694

Raw material

690,694

Antitubercular therapy

659

Industrial yeast

714

Rhodotorula mucilaginosa

683

Bagasse kraft pulp

699

Killer phenomenon

714

Sacharomyces cerevisiae

714

Barrier base paper

694

Killer yeast

714

Siloxane membrane

666

Biological activities

659

Kraft paper

699

Soap resistant paper

690

Bleaching

699,707

Kraft pulping

707

Specialty paper

690,694

Cane molasses

714

Medicinal uses

659

Steel

683

Chlorinated organic material

707

Mild steel

683

Therapeutic uses

659

Corrosion

683

Nickel

718

Transport parameters

666

Electrical discharge machining

678

Nitroimidazoles

659

Water

683

Electrodeposition

718

Non-conventional machining process

678

Yeast

714

Eucalyptus

707

Oxygen

683

Zinc

718

Eucalyptus pulp

707

Oxygen-peroxide delignification

699

Zinc-nickel alloy

718